CN103308336B - Heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring - Google Patents

Abstract

The invention discloses a heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring, belongs to the technical field of the running fault diagnosis of a heat exchanger, and solves the problem that the fault diagnosis accuracy is poor because the heat exchange working medium flow is needed to be monitored in the current heat exchanger fault diagnosis method. The temperature signal output end of a temperature sensor and the pressure signal output end of a pressure sensor are respectively connected with the corresponding signal interfaces of a fault diagnotor which is used for receiving, storing, computing and processing, displaying data and fault diagnosis alarm. According to the method, the rated flow range of a first heat exchange medium of the heat exchanger is divided into N internals; the rated flow range of a second heat exchange medium of the heat exchanger is divided into M internals; temperature and pressure parameters under the condition of the heat exchanger without any fault are computed and processed to be stored as a feature parameter of the heat exchanger in the fault diagnotor; the fault diagnotor carries out processing according to the real-time running data which are transmitted by the temperature sensor and the pressure sensor and computes a specific value of the corresponding data under the condition of no fault so as to judge whether the heat exchanger has a fault or not; and the method is used for the on-line fault diagnosis of the heat exchanger.

Description

A kind of heat exchanger fault diagnosis system based on temperature and pressure signal monitoring and method

Technical field

The present invention relates to a kind of System and method for of heat exchanger operation troubles inline diagnosis, the invention belongs to heat exchanger runs Fault diagnosis technology field, particularly to one kind, to carry out heat exchanger operation troubles under heat-exchange working medium flow condition online not measuring The System and method for of diagnosis.

Technical background

Very universal, the warp to these industries for its high efficient and reliable operation applied in industrial production and national life by heat exchanger Ji benefit has vital impact.But, the fault such as the dirt of heat exchanger presence, blocking, leakage is the actual fortune of heat exchanger Generally existing problem to be solved in row.Show according to investigations, more than 90% heat exchanger all has dirt, blocking and leakage and asks Topic.Due to the presence of these problems, heat transfer coefficient of heat exchanger is caused to reduce, flow resistance increases, equipment life shortens, Jin Erzao A series of economic problems are become.According to industrially developed country's statistics, only with regard to one, heat exchanger dirt, Britain in 1992 and the U.S. use Expense in dirt accounts for the 0.25% of gross national product, and New Zealand of Britain and Australia are 0.1%, and Germany and Japan are 0.25%.As can be seen here, the economic loss that the fault such as the dirt of heat exchanger presence, blocking, leakage causes to national product life It is huge.Exploitation heat exchanger fault diagnosis technology can preferably ensure that heat exchanger high efficient and reliable is run, and energy saving is saved Expense.

Current heat exchanger fault diagnosis technology generally existing problems with：

(1) fault diagnosis technology of heat exchanger needs to monitor the operating flux of heat exchanger heat-exchange working medium.Which results in heat exchange Device fault diagnosis system cost increases, and because flow measurement accuracy is difficult to ensure that, cause fault diagnosis confidence level and Accuracy is greatly reduced.

(2) fault diagnosis technology of heat exchanger, based on heat transfer formula and the resistance formula of concrete heat exchanger, lacks universal Practicality.Different heat exchanger structure forms, such as plate type heat exchanger and shell and tube exchanger, under the conditions of various heat exchange working medium, The heat transfer coefficient rule of heat exchanger and drag characteristic differ widely.And the HEAT TRANSFER LAW of heat exchanger is general with drag characteristic From experiment or summary of experience, accuracy is poor, also will result in the confidence level of fault diagnosis and accuracy is greatly reduced.Especially Be most of heat exchangers be that its heat transfer coefficient and drag characteristic formula cannot be provided.

Content of the invention

It is an object of the invention to provide a kind of heat exchanger fault diagnosis system based on temperature and pressure signal monitoring and side Method, to solve existing heat exchanger fault diagnosis technology and exist to need to measure heat-exchange working medium flow, or rely on heat exchanger heat exchange with Drag characteristic empirical equation, causes the problem of fault diagnosis poor accuracy.

The present invention is to solve above-mentioned technical problem to adopt the technical scheme that：

Technical scheme one：A kind of heat exchanger fault diagnosis system based on temperature and pressure signal monitoring, described system bag Include：On heat transferring medium one inlet pipeline of heat exchanger by near (by near to remote, be as reference with heat exchanger to far setting gradually ) the first temperature sensor, first pressure sensor and second pressure sensor, in heat transferring medium one outlet of heat exchanger By near to the second temperature sensor far setting gradually, the 3rd pressure sensor on road, in heat transferring medium two import of heat exchanger By near to the three-temperature sensor far setting gradually and the 4th pressure sensor on pipeline, go out in the heat transferring medium two of heat exchanger By near to the 4th temperature sensor far setting gradually and the 5th pressure sensor on mouth pipeline；The temperature of four temperature sensors The signal output end of signal output part and five pressure sensors respectively with a pair of fault diagnosis device corresponding signal interface 1 Should connect；Fault diagnosis device is used for data receiver, storage, calculating is processed, display and fault diagnosis are reported to the police.As Fig. 1.

Technical scheme two：Technical scheme one is limited further：First pressure sensor and second pressure sensor it Between pipeline on be provided with resistance criteria part.As Fig. 2.

Technical scheme three：Technical scheme one is limited further：Heat transferring medium two outlet conduit of heat exchanger is set up 6th pressure sensor；4th temperature sensor, the 5th pressure sensor, the 6th pressure sensor are by near to far setting successively Put.As Fig. 3.

Technical scheme four：Technical scheme three is limited further：First pressure sensor and second pressure sensor it Between pipeline on be provided with resistance criteria part, the pipeline between the 5th pressure sensor and the 6th pressure sensor is provided with Resistance criteria part.As Fig. 4.

Technical scheme five：A kind of heat exchanger based on temperature and pressure signal monitoring described in utilization technical scheme one or two The heat exchanger method for diagnosing faults of fault diagnosis system, the detailed process of methods described is：

Step one, by metered flow scope V of heat exchanger heat transferring medium one_1dBe divided into N number of interval, in N number of interval each Interval all takes traffic characteristic value V_1i(1≤i≤N), metered flow scope V of heat transferring medium two_2dIt is divided into M interval, M In individual interval, each interval all takes traffic characteristic value V_2k(1≤k≤M)；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat exchange Jie Impedance limit ratio β of matter one_1max, impedance limit ratio β of heat transferring medium two_2max；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively Reach traffic characteristic value the stable operation of each flow rate zone, record simultaneously and store the temperature and pressure parameter under this operating mode (temperature, pressure parameter here leads to four temperature sensors and five pressure sensors obtain), each temperature sensor will be remembered N × M data of record, the first temperature sensor will record altogether N × M data, and record symbol is t_{3 (i, k)}, represent the first temperature Sensor is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium two is V_2kUnder the conditions of temperature value, other TEMPs The record symbol regulation of device data is identical with this；

First pressure sensor, the 3rd pressure sensor, second pressure sensor will record N number of data, and second pressure passes Sensor will record N number of data, and record symbol is P_11(i), represent that second pressure sensor is V in the flow of heat transferring medium one_1iBar Pressure value under part, first pressure sensor, the record symbol of the 3rd pressure sensor data specify identical with this；

5th pressure sensor, the 4th pressure sensor will record M data, and the 5th pressure sensor will record M number According to record symbol is P_9(k), represent that the 5th pressure sensor is V in the flow of heat transferring medium two_2kUnder the conditions of pressure value, the 4th The record symbol regulation of pressure sensor data is identical with this.

And carry out calculating the spy processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Levy parameter；And the device external differential Δ P by heat transferring medium one_s1(i), temperature difference of heat exchanger ratio R_{V (i, k)}It is set as operating mode identification parameter；

, in actual moving process, fault diagnosis device passes according to temperature sensor and pressure sensor for step 4, heat exchanger The real-time running data passed, carries out calculating process；And inquire corresponding operating mode under fault-free conditions according to operating mode identification parameter Related data；And calculating in actual moving process is processed the feature of the data heat exchanger corresponding with fault-free conditions obtaining Parameter carries out ratio calculation and obtains diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and Departure degree, to judge whether heat exchanger the faults such as dirt, blocking, leakage, and fault degree.

Technical scheme six：Technical scheme five is limited further：In step 3, by said temperature in fault diagnosis device Carry out calculating the detailed process processing with pressure parameter and be：

The flow of heat transferring medium one is V_1i(1≤i≤N), the flow of heat transferring medium two is V_2kThe operating mode of (1≤k≤M) It is designated as (i, k), calculate the following parameter under this operating mode, and stored as the characteristic parameter of heat exchanger；

The temperature difference of N × M heat transferring medium one：δt_1(ik)=| t_{3 (i, k)}-t_{4 (i, k)}| (1≤i≤N, 1≤k≤M)；

The temperature difference of N × M heat transferring medium two：δt_{2 (i, k)}=| t_{5 (i, k)}-t_{6 (i, k)}| (1≤i≤N, 1≤k≤M)；

N × M mean temperature difference： ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N × M temperature difference ratio： $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N number of heat transferring medium one：ΔP_s1(i)=P_11(i)-P_7(i)(1≤i≤N)；

Pressure reduction in the device of N number of heat transferring medium one：ΔP_h1(i)=P_7(i)-P_8(i)(1≤i≤N)；

Pressure reduction in the device of M heat transferring medium two：ΔP_h2(k)=P_6(k)-P_5(k)(1≤k≤M)；

The device external differential of M heat transferring medium two：Take thermal medium first-class Measure as V_1NWhen data calculated；

N × M intermediate parameters： $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N × M intermediate parameters： $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N number of intermediate parameters： $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters： $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in fault diagnosis device, and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select Δ P_s1(i)And R_{V (i, k)}Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature and five after heat exchanger comes into operation in real time Individual pressure value, the record symbol of the data that the first temperature sensor monitored in certain moment is t₃, second pressure Sensor monitoring The record symbol of the data arriving is P₁₁, other temperature sensors and the record symbol of pressure sensor specify identical with this；To every Secondary this nine data monitoring carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference： ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio： $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one：ΔP_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：ΔP_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：ΔP_h2=P₆-P₅；

The device external differential of heat transferring medium two： ${\mathrm{\ΔP}}_{s2}={\mathrm{\ΔP}}_{s1}{\left(\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2}\right)}^2;$

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about this operating condition corresponding fault-free operating mode：First in the fault-free device of heat transferring medium one External differential data sequence Δ P_s(i)In find device external pressure difference data Δ P with actual operating mode_s1Size closest to data, and Record its searching number it is assumed that being n；Then searching number for n value R_{V (n, k)}Find and run temperature difference ratio R in data sequence_v The immediate data of size, and record its another searching number it is assumed that being m；Then have found nothing corresponding with this operating condition Fault condition (n, m)；

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval is to actual operating mode corresponding fault-free work After condition, recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and journey will be used for The diagnosis of degree：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、β₁、β₂1 or closely 1 all should be equal to；Heat exchange After device has dirt or blocking, α₁To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁And β₂Will be big In 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；Examining of dirt and plugging fault can be carried out according to this principle Disconnected, and the judgement of fault degree, specifically diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁＞ β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂＞ β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, following logical algorithm can be taken：

(1) if δ is t_{1 (n, m)}＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_{1 (n, m)}＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_{2 (n, m)}＜ δ t₂, then prompting heat transferring medium two may leakage；

(4) if δ is t_{2 (n, m)}＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

Above data receiver, calculating the operation such as process, store, calling and all will complete inside fault diagnosis device (16).

Technical scheme seven：A kind of heat exchanger based on temperature and pressure signal monitoring described in utilization technical scheme three or four The heat exchanger method for diagnosing faults of fault diagnosis system, the detailed process of methods described is：

Step one, by metered flow scope V of heat exchanger heat transferring medium one_1dBe divided into N number of interval, in N number of interval each Interval all takes traffic characteristic value V_1i(1≤i≤N), metered flow scope V of heat transferring medium two_2dIt is divided into M interval, M In individual interval, each interval all takes traffic characteristic value V_2k(1≤k≤M)；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat exchange Jie Impedance limit ratio β of matter one_1max, impedance limit ratio β of heat transferring medium two_2max；The limit value α of ratio of heat transfer coefficient II_2min, heat transfer system Number is than restriction scope [the Δ α of I and the absolute value of the difference of ratio of heat transfer coefficient II_1min, Δ α_2min]；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively Reach traffic characteristic value the stable operation of each flow rate zone, record simultaneously and store the temperature and pressure parameter under this operating mode (temperature, pressure parameter here leads to four temperature sensors and six pressure sensors obtain), each temperature sensor will be remembered N × M data of record, the first temperature sensor will record altogether N × M data, and record symbol is t_{3 (i, k)}, represent the first temperature Sensor is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium two is V_2kUnder the conditions of temperature value, other TEMPs The record symbol regulation of device data is identical with this；

First pressure sensor, the 3rd pressure sensor, second pressure sensor will record N number of data, and second pressure passes Sensor will record N number of data, and record symbol is P_11(i), represent that second pressure sensor is V in the flow of heat transferring medium one_1iBar Pressure value under part, first pressure sensor, the record symbol of the 3rd pressure sensor data specify identical with this；

5th pressure sensor, the 4th pressure sensor, the 6th pressure sensor will record M data, and the 6th pressure passes Sensor will record M data, and record symbol is P_12(k), represent that the 6th pressure sensor is V in the flow of heat transferring medium two_2kBar Pressure value under part, the 5th pressure sensor, the record symbol of the 4th pressure sensor data specify identical with this.

And carry out calculating the spy processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Levy parameter；And the device external differential Δ P by heat transferring medium one_s1(i), temperature difference of heat exchanger ratio R_{V (i, k)}It is set as operating mode identification parameter；

, in actual moving process, fault diagnosis device passes according to temperature sensor and pressure sensor for step 4, heat exchanger The real-time running data passed, carries out calculating process；And inquire corresponding operating mode under fault-free conditions according to operating mode identification parameter Related data；And calculating in actual moving process is processed the feature of the data heat exchanger corresponding with fault-free conditions obtaining Parameter carries out ratio calculation and obtains diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and Departure degree, to judge whether heat exchanger the faults such as dirt, blocking, leakage, and fault degree.

Technical scheme eight：Technical scheme seven is limited further：

In step 3, said temperature and pressure parameter are carried out calculating the detailed process processing in fault diagnosis device For：

The flow of heat transferring medium one is V_1i(1≤i≤N), the flow of heat transferring medium two is V_2kThe operating mode of (1≤k≤M) It is designated as (i, k), calculate the following parameter under this operating mode, and stored as the characteristic parameter of heat exchanger：

The temperature difference of N × M heat transferring medium one：δt_1(ik)=| t_{3 (i, k)}-t_{4 (i, k)}| (1≤i≤N, 1≤k≤M)；

The temperature difference of N × M heat transferring medium two：δt_{2 (i, k)}=| t_{5 (i, k)}-t_{6 (i, k)}| (1≤i≤N, 1≤k≤M)；

N × M mean temperature difference： ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N × M temperature difference ratio： $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N number of heat transferring medium one：ΔP_s1(i)=P_11(i)-P_7(i)(1≤i≤N)；

Pressure reduction in the device of N number of heat transferring medium one：ΔP_h1(i)=P_7(i)-P_8(i)(1≤i≤N)；

Pressure reduction in the device of M heat transferring medium two：ΔP_h2(k)=P_6(k)-P_5(k)(1≤k≤M)；

The device external differential of M heat transferring medium two：ΔP_s2(k)=P_9(k)-P_12(k)(1≤k≤M)；

N × M intermediate parameters： $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N × M intermediate parameters： $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N number of intermediate parameters： $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters： $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in fault diagnosis device, and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select Δ P_s1(i)And R_{V (i, k)}Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature and six after heat exchanger comes into operation in real time Individual pressure value, the record symbol of the data that the first temperature sensor monitored in certain moment is t₃, the 6th pressure sensor monitoring The record symbol of the data arriving is P₁₂, other temperature sensors and the record symbol of pressure sensor specify identical with this；To every Secondary this 10 data monitoring carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference： ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio： $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one：ΔP_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：ΔP_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：ΔP_h2=P₆-P₅；

The device external differential of heat transferring medium two：ΔP_s2=P₉-P₁₂；

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about this operating condition corresponding fault-free operating mode：First in the fault-free device of heat transferring medium one External differential data sequence Δ P_s1(i)In find device external pressure difference data Δ P with actual operating mode_s1Size closest to data, And record its searching number it is assumed that being n；Then searching number for n value R_{V (n, k)}Find and run temperature difference ratio in data sequence R_vThe immediate data of size, and record its another searching number it is assumed that being m；Then have found corresponding with this operating condition Fault-free operating mode (n, m)；

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval is to actual operating mode corresponding fault-free work After condition, recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and journey will be used for The diagnosis of degree：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、α₂、β₁、β₂1 or closely 1 all should be equal to； After heat exchanger has dirt or blocking, α₁Or α₂To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁ And β₂Will be greater than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；In the case of No leakage, α₁With α₂Should equal (or Person's approximately equal), the degree of the two difference is bigger, illustrates that heat exchanger occurs the possibility of leakage also bigger.Former according to this Reason can carry out the diagnosis of dirt and plugging fault, and the judgement of fault degree, and concrete diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₂＜ α_2min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁＞ β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂＞ β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, following logical algorithm can be taken：

(1) if δ is t_{1 (n, m)}＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_{1 (n, m)}＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_{2 (n, m)}＜ δ_t2, then prompting heat transferring medium two may leakage；

(4) if δ is t_{2 (n, m)}＜ δ_t2, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

In combination with following leak diagnostics logical algorithm：

(1) if Δ α_1min≤|α₁-α₂| ＜ Δ α_2min, then diagnosable and point out heat exchanger to may have occurred leakage；

(2) if α₁-α₂≥Δα_2min, then diagnosable and point out heat transferring medium one to heat transferring medium two leakage；

(3) if α₂-α₁≥Δα_2min, then diagnosable and point out heat transferring medium two to heat transferring medium one leakage；

Above data receiver, calculating the operation such as process, store, calling and all will complete inside fault diagnosis device 16.

Technical scheme nine：A kind of heat exchanger based on temperature and pressure signal monitoring described in utilization technical scheme three or four The heat exchanger method for diagnosing faults of fault diagnosis system,

Step one, by specified device external differential range delta P of heat exchanger heat transferring medium one_s1dIt is divided into N number of interval, each area Between take the characteristic value Δ P of a device external differential_s1(i)(1≤i≤N)；Specified device external differential range delta P of heat transferring medium two_s2dDivide Interval for M, each interval takes the characteristic value Δ P of a device external differential_s2(k)(1≤k≤M)；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat exchange Jie Impedance limit ratio β of matter one_1max, impedance limit ratio β of heat transferring medium two_2max；The limit value α of ratio of heat transfer coefficient II_2min, heat transfer system Number is than restriction scope [the Δ α of I and the absolute value of the difference of ratio of heat transfer coefficient II_1min, Δ α_2min]；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively Reach the interval characteristic value of device external differential of each device external differential stable operation, record simultaneously and store temperature under this operating mode and Pressure parameter (temperature, pressure parameter here leads to four temperature sensors and six pressure sensors obtain), each temperature passes Sensor will record N × M data, and temperature sensor 3 will record altogether N × M data, and record symbol is t_{3 (i, k)}, represent temperature Sensor 3 is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium 2 is V_2kUnder the conditions of temperature value, other TEMPs The record symbol regulation of device data is identical with this；

First pressure sensor, the 3rd pressure sensor, second pressure sensor will record N number of data, and second pressure passes Sensor will record N number of data, and record symbol is P_11(i), represent that second pressure sensor is V in the flow of heat transferring medium one_1iBar Pressure value under part, first pressure sensor, the record symbol of the 3rd pressure sensor data specify identical with this；

5th pressure sensor, the 4th pressure sensor, the 6th pressure sensor will record M data, and the 6th pressure passes Sensor will record M data, and record symbol is P_12(k), represent that the 6th pressure sensor is V in the flow of heat transferring medium two_2kBar Pressure value under part, the 5th pressure sensor, the record symbol of the 4th pressure sensor data specify identical with this.

And carry out calculating the spy processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Levy parameter；And the device external differential Δ P by heat transferring medium one_s1(i), the device external differential Δ P of heat transferring medium two_s2(k)It is set as operating mode mark Know parameter；

, in actual moving process, fault diagnosis device passes according to temperature sensor and pressure sensor for step 4, heat exchanger The real-time running data passed, carries out calculating process；And inquire corresponding operating mode under fault-free conditions according to operating mode identification parameter Related data；And calculating in actual moving process is processed the feature of the data heat exchanger corresponding with fault-free conditions obtaining Parameter carries out ratio calculation and obtains diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and Departure degree, to judge whether heat exchanger the faults such as dirt, blocking, leakage, and fault degree.

Technical scheme ten：Technical scheme nine is limited further：

In step 3, said temperature and pressure parameter are carried out calculating the detailed process processing in fault diagnosis device For：

Characteristic value Δ P by the device external differential of heat transferring medium one_s1(i)(1≤i≤N), the device external differential of heat transferring medium two Characteristic value Δ P_s2(k)The operating mode of (1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and the spy as heat exchanger Levy parameter to be stored：

The temperature difference of N × M heat transferring medium one：δt_1(ik)=| t_{3 (i, k)}-t_{4 (i, k)}| (1≤i≤N, 1≤k≤M)；

The temperature difference of N × M heat transferring medium two：δt_{2 (i, k)}=| t_{5 (i, k)}-t_{6 (i, k)}| (1≤i≤N, 1≤k≤M)；

N × M mean temperature difference： ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N × M temperature difference ratio： $P_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N number of heat transferring medium one：ΔP_s1(i)=P_11(i)-P_7(i)(1≤i≤N)；

Pressure reduction in the device of N number of heat transferring medium one：ΔP_h(i)=P_7(i)-P_8(i)(1≤i≤N)；

Pressure reduction in the device of M heat transferring medium two：ΔP_h2(k)=P_6(k)-P_5(k)(1≤k≤M)；

The device external differential of M heat transferring medium two：ΔP_s2(k)=P_9(k)-P_12(k)(1≤k≤M)；

N × M intermediate parameters： $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N × M intermediate parameters： $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N number of intermediate parameters： $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters： $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in fault diagnosis device, and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select Δ P_s1(i)With Δ P_s2(k)Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature and six after heat exchanger comes into operation in real time Individual pressure value, the record symbol of the data that the first temperature sensor monitored in certain moment is t₃, the 6th pressure sensor monitoring The record symbol of the data arriving is P₁₂, other temperature sensors and the record symbol of pressure sensor specify identical with this；To every Secondary this 10 data monitoring carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference： ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio： $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one：ΔP_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：ΔP_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：ΔP_h2=P₆-P₅；

The device external differential of heat transferring medium two：ΔP_s2=P₉-P₁₂；

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquire about this operating condition corresponding fault-free operating mode：First in the fault-free device of heat transferring medium one External differential data sequence Δ P_s1(i)In find device external pressure difference data Δ P with actual operating mode_s1Size closest to data, And record its searching number it is assumed that being n；Then in the fault-free device external differential data sequence Δ P of heat transferring medium two_s2(k)In find Device external pressure difference data Δ P with actual operating mode_s2Size is closest to data, and records its searching number it is assumed that being m；Then look for Arrive fault-free operating mode (n, m) corresponding with this operating condition.

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval is to actual operating mode corresponding fault-free work After condition, recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and journey will be used for The diagnosis of degree：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、α₂、β₁、β₂1 or closely 1 all should be equal to； After heat exchanger has dirt or blocking, α₁Or α₂To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁ And β₂Will be greater than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；In the case of No leakage, α₁With α₂Should equal (or Person's approximately equal), the degree of the two difference is bigger, illustrates that heat exchanger occurs the possibility of leakage also bigger.Former according to this Reason can carry out the diagnosis of dirt and plugging fault, and the judgement of fault degree, and concrete diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₂＜ α_2min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁＞ β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂＞ β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, following logical algorithm can be taken：

(1) if δ is t_{1 (n, m)}＜ δ t₁, then prompting heat transferring medium one may leakage.

(2) if δ is t_{1 (n, m)}＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two.

(3) if δ is t_{2 (n, m)}＜ δ t₂, then prompting heat transferring medium two may leakage.

(4) if δ is t_{2 (n, m)}＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

In combination with following leak diagnostics logical algorithm：

(1) if Δ α_1min≤|α₁-α₂| ＜ Δ α_2min, then diagnosable and point out heat exchanger to may have occurred leakage；

(2) if α₁-α₂≥Δα_2min, then diagnosable and point out heat transferring medium one to heat transferring medium two leakage；

(3) if α₂-α₁≥Δα_2min, then diagnosable and point out heat transferring medium two to heat transferring medium one leakage；

Above data receiver, calculating the operation such as process, store, calling and all will complete inside fault diagnosis device.

The invention has the advantages that：

A kind of heat exchanger fault diagnosis system based on temperature and pressure signal of the present invention and its method are primarily adapted for use in Heat transferring medium is all fluid, and the dividing wall type heat exchanger that at least a kind of heat transferring medium does not undergo phase transition.The present invention is used for changing The on-line fault diagnosis of hot device.A kind of heat exchanger fault diagnosis system based on temperature and pressure signal monitoring that the present invention provides The flow of heat-exchange working medium need not be monitored with method and not rely on concrete heat exchanger and accurately conduct heat formula and resistance formula, permissible Effectively carry out the dirt of heat exchanger, blocking, the diagnosis of leakage failure, improve efficiency, reliability and the economy that heat exchanger runs Property.Concrete advantage shows the following aspects：

(1) the temperature and pressure parameter of heat exchanger need to only be monitored, monitoring is simple, low cost, high precision.

(2) flow of heat transferring medium in heat exchanger need not be monitored, monitoring cost is low, and for existing heat exchanger system When implementing the present invention, the pipeline that need not cut off original heat exchanger system is simple to install flowmeter, transformation.

(3) need not test in a large number and summarize the heat exchange formula that heat exchanger is provided and resistance formula, there is not formula inaccurate The fault diagnosis error causing.

(4) characteristic parameter of heat exchanger need not be provided, need not be to the fault diagnosis of multi-form, the heat exchanger of different model Device inner parameter is manually arranged, because these inner parameters are heat exchangers when running under fault-free conditions, fault diagnosis Device automatically recognizes, calculates and stores, therefore the present invention implement simple, heat exchanger applied widely.

Realize the heat exchanger fault diagnosis system of technical solution of the present invention, including have data input, output, storage, fortune The fault diagnosis device of calculation, display and warning function, heat exchanger, at least 4 temperature sensors, at least 5 pressure sensors, if Dry resistance criteria part.A kind of heat exchanger fault diagnosis system structure based on temperature and pressure signal of the present invention is to change Temperature sensor 3 is provided with heat transferring medium one inlet pipeline of hot device 15, pressure sensor 7 and pressure sensor 11 are (wherein Between pressure sensor 7 and pressure sensor 11, needs separated by a distance ensure that pressure difference therebetween is obvious, reach More than 10 times of gauge measurement error), outlet conduit is provided with temperature sensor 4, pressure sensor 8.In heat exchanger Temperature sensor 6, pressure sensor 10 are provided with heat transferring medium two inlet pipeline, outlet conduit is provided with temperature sensor 5, pressure sensor 9.4 temperature sensors and 5 pressure sensors are connected with fault diagnosis device 16 respectively.Fault diagnosis device The real time execution parameter of 16 heat exchangers being provided according to temperature sensor and pressure sensor and diagnostic logic carry out heat exchanger Operation troubles diagnose and store, show, report to the police.

The a kind of of the present invention based on its diagnostic method of heat exchanger fault diagnosis system of temperature and pressure signal be, by heat exchange The metered flow scope of device heat transferring medium one is divided into N number of interval, and the metered flow scope of heat transferring medium two is divided into M area Between, set the judgement limit value of some diagnosis ratio parameters.First, under guaranteeing heat exchanger fault-free conditions, adjust heat exchanger, real Show heat transferring medium one and heat transferring medium two respectively reaches traffic characteristic value the stable operation of each flow rate zone, record simultaneously and store up Deposit the temperature and pressure parameter under this operating mode, and in fault diagnosis device using calculating process the characteristic parameter as heat exchanger. Hereafter, in actual moving process, fault diagnosis device is according to the real-time fortune of temperature sensor and pressure sensor transmission for heat exchanger Row data, carries out calculating process, and obtains the related data corresponding to operating mode under fault-free conditions according to the inquiry of operating mode identification parameter, And the characteristic parameter of data heat exchanger corresponding with fault-free conditions obtaining calculating process in actual moving process is carried out Ratio calculation obtains diagnosing ratio parameter；Closed according to the size judging limit value of diagnosis ratio parameter and the ratio parameter setting System, and departure degree, to judge whether heat exchanger the faults such as dirt, blocking, leakage, and fault degree, finally make The reaction such as go out display, report to the police.

Brief description

Fig. 1 is the heat exchanger fault diagnosis system structure chart of the specific embodiment of the invention one；Fig. 2 is specific embodiment Two heat exchanger fault diagnosis system structure chart；Fig. 3 is the heat exchanger fault diagnosis system structure chart of specific embodiment three；Figure 4 is the heat exchanger fault diagnosis system structure chart of specific embodiment four.

Specific embodiment

Specific embodiment one：In conjunction with Fig. 1, present embodiment is described, described in present embodiment, one kind is based on temperature and pressure The heat exchanger fault diagnosis system structure of signal monitoring is to be provided with temperature on heat transferring medium one inlet pipeline of heat exchanger 15 Sensor 3, pressure sensor 7 and pressure sensor 11 are (wherein separated by a distance between pressure sensor 7 and pressure sensor 11 Need to ensure that pressure difference therebetween is obvious, reach more than 10 times of gauge measurement error), outlet conduit is arranged There are temperature sensor 4, pressure sensor 8.Temperature sensor 6 is provided with heat transferring medium two inlet pipeline of heat exchanger, pressure Force snesor 10, outlet conduit is provided with temperature sensor 5, pressure sensor 9.4 temperature sensors and 5 pressure sensings Device is connected with fault diagnosis device 16 respectively.The heat exchange that fault diagnosis device 16 is provided according to temperature sensor and pressure sensor The operation troubles that the real time execution parameter of device and diagnostic logic carry out heat exchanger diagnoses and stores, shows, reports to the police.

The a kind of of the present invention based on its diagnostic method of heat exchanger fault diagnosis system of temperature and pressure signal be, by heat exchange The metered flow scope of device heat transferring medium one is divided into N number of interval, and the metered flow scope of heat transferring medium two is divided into M area Between, set the judgement limit value of some diagnosis ratio parameters.First, under guaranteeing heat exchanger fault-free conditions, adjust heat exchanger, real Show heat transferring medium one and heat transferring medium two respectively reaches traffic characteristic value the stable operation of each flow rate zone, record simultaneously and store up Deposit the temperature and pressure parameter under this operating mode, and in fault diagnosis device using calculating process the characteristic parameter as heat exchanger. Hereafter, in actual moving process, fault diagnosis device is according to the real-time fortune of temperature sensor and pressure sensor transmission for heat exchanger Row data, carries out calculating process, and obtains the related data corresponding to operating mode under fault-free conditions according to the inquiry of operating mode identification parameter, And the characteristic parameter of data heat exchanger corresponding with fault-free conditions obtaining calculating process in actual moving process is carried out Ratio calculation obtains diagnosing ratio parameter；Closed according to the size judging limit value of diagnosis ratio parameter and the ratio parameter setting System, and departure degree, to judge whether heat exchanger the faults such as dirt, blocking, leakage, and fault degree, finally make The reaction such as go out display, report to the police.

The course of work of the fault diagnosis of present embodiment is as follows with logic：

(1) by the range of flow V of heat exchanger heat transferring medium one_1d, it is divided into N number of interval, each interval takes a flow spy Value indicative V_1i(1≤i≤N).The range of flow V of heat transferring medium two_2d, it is divided into M interval, each interval takes a traffic characteristic Value V_2k(1≤k≤M).Set the limit value α of ratio of heat transfer coefficient I_1min, impedance limit ratio β of heat transferring medium one_1max, heat transferring medium two Impedance limit ratio β_2max.

(2) failure-free data monitoring storage：Guaranteeing that (for example heat exchanger puts into for the first time in the case of heat exchanger is trouble-free During normal use, or after certain cleaning maintenance), adjust the flow changing heat transferring medium one and heat transferring medium two in heat exchanger, It is allowed to reach successively the traffic characteristic value of each flow rate zone, record and store under various flow rate working conditions, the 4 of the import and export of heat exchanger Individual temperature and 5 pressure.Each temperature sensor will record N × M data, and such as temperature sensor 3 will record altogether N × M Individual data, record symbol is t_{3 (i, k)}, represent that temperature sensor 3 is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium 2 For V_2kUnder the conditions of temperature value, other temperature sensor data record symbol regulation identical with this；Pressure sensor 7, pressure Sensor 8, pressure sensor 11 will record N number of data, and such as pressure sensor 11 will record N number of data, and record symbol is P_11(i), represent that pressure sensor 11 is V in the flow of heat transferring medium one_1iUnder the conditions of pressure value, pressure sensor 7, pressure pass The record symbol regulation of sensor 8 data is identical with this；Pressure sensor 9, pressure sensor 10 will record M data, for example, press Force snesor 9 will record M data, and record symbol is P_9(k), represent that pressure sensor 9 is V in the flow of heat transferring medium two_2kBar Pressure value under part, the record symbol regulation of pressure sensor 10 data is identical with this.

(3) failure-free data is processed：The flow of heat transferring medium one is V_1i(1≤i≤N), the flow of heat transferring medium two is V_2kThe operating mode of (1≤k≤M) is designated as (i, k), calculates the following parameter under this operating mode, and gives as the characteristic parameter of heat exchanger Storage：

The temperature difference of N × M heat transferring medium one：δt_1(ik)=| t_{3 (i, k)}-t_{4 (i, k)}| (1≤i≤N, 1≤k≤M)；

The temperature difference of N × M heat transferring medium two：δt_{2 (i, k)}=| t_{5 (i, k)}-t_{6 (i, k)}| (1≤i≤N, 1≤k≤M)；

N × M mean temperature difference： ${\mathrm{\Δt}}_{m(i,k)}=\left|\frac{(t_{3(i,k)}-t_{5(i,k)})-(t_{4(i,k)}-t_{6(i,k)})}{\ln \frac{(t_{3(i,k)}-t_{5(i,k)})}{(t_{4(i,k)}-t_{6(i,k)})}}\right|(1\≤i\≤N,1\≤k\≤M);$

N × M temperature difference ratio： $R_{v(i,k)}=\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\δt}}_{2(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

The device external differential of N number of heat transferring medium one：ΔP_s1(i)=P_11(i)-P_7(i)(1≤i≤N)；

Pressure reduction in the device of N number of heat transferring medium one：ΔP_h1(i)=P_7(i)-P_8(i)(1≤i≤N)；

Pressure reduction in the device of M heat transferring medium two：ΔP_h2(k)=P_6(k)-P_5(k)(1≤k≤M)；

The device external differential of M heat transferring medium two：Take thermal medium first-class Measure as V_1NWhen data calculated；

N × M intermediate parameters： $B_{1(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s1\left(i\right)}}\·\frac{{\mathrm{\δt}}_{1(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N × M intermediate parameters： $B_{2(i,k)}=\sqrt{{\mathrm{\ΔP}}_{s2\left(k\right)}}\·\frac{{\mathrm{\δt}}_{2(i,k)}}{{\mathrm{\Δt}}_{m(i,k)}}(1\≤i\≤N,1\≤k\≤M);$

N number of intermediate parameters： $D_{1\left(i\right)}=\frac{{\mathrm{\ΔP}}_{h1\left(i\right)}}{{\mathrm{\ΔP}}_{s1\left(i\right)}}(1\≤i\≤N);$

M intermediate parameters： $D_{2\left(k\right)}=\frac{{\mathrm{\ΔP}}_{h2\left(k\right)}}{{\mathrm{\ΔP}}_{s2\left(k\right)}}(1\≤k\≤N);$

Above parameter will be stored in fault diagnosis device 16, and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select Δ P_s1(i)And R_{V (i, k)}Identification parameter as (i, k) operating mode.

(4) Monitoring Data processing when running：Survey 4 temperature after heat exchanger comes into operation and 5 pressure value, example in real time The record symbol of the data monitoring in certain moment as the first temperature sensor 3 is t₃, second pressure sensor 11 monitors The record symbol of data is P₁₁, other temperature sensors and the record symbol of pressure sensor specify identical with this；Supervise to each This 9 data measuring carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference： ${\mathrm{\Δt}}_m=\left|\frac{(t_3-t_5)-(t_4-t_6)}{\ln \frac{(t_3-t_5)}{(t_4-t_6)}}\right|;$

Temperature difference ratio： $R_v=\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2};$

The device external differential of heat transferring medium one：ΔP_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：ΔP_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：ΔP_h2=P₆-P₅；

The device external differential of heat transferring medium two： ${\mathrm{\ΔP}}_{s2}={\mathrm{\ΔP}}_{s1}{\left(\frac{{\mathrm{\δt}}_1}{{\mathrm{\δt}}_2}\right)}^2;$

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

(5) inquire about this operating condition corresponding fault-free operating mode：First in the fault-free device external pressure difference of heat transferring medium one According to sequence Δ P_s1(i)In find device external pressure difference data Δ P with actual operating mode_s1Size is closest to data, and records it Searching number is it is assumed that be n；Then searching number for n value R_{V (n, k)}Find and run temperature difference ratio R in data sequence_vSize is Close data, and record its another searching number it is assumed that being m；Then have found fault-free work corresponding with this operating condition Condition (n, m)；

(6) calculate fault diagnosis ratio parameter：Retrieval, to after actual operating mode corresponding fault-free operating mode, recalls The characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, the diagnosis of fault category and degree will be used for：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

(7) carry out fault diagnosis and degree judges：If heat exchanger does not have dirt or does not block, then α₁、β₁、β₂All 1 or closely 1 should be equal to；After heat exchanger has dirt or blocking, α₁To less than 1, and deviate 1 more remote, say Bright dirt or blocking are more serious；β₁And β₂Will be greater than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；Former according to this Reason can carry out the diagnosis of dirt and plugging fault, and the judgement of fault degree, and concrete diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁＞ β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂＞ β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, following logical algorithm can be taken：

(1) if δ is t_{1 (n, m)}＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_{1 (n, m)}＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_{2 (n, m)}＜ δ t₂, then prompting heat transferring medium two may leakage；

(4) if δ is t_{2 (n, m)}＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

Above data receiver, calculating the operation such as process, store, calling and all will complete inside fault diagnosis device 16.

Specific embodiment two：The difference of present embodiment, present embodiment and specific embodiment one is described in conjunction with Fig. 2 It is to be provided with a resistance criteria part 13 between pressure sensor 11 and pressure sensor 7.In embodiment one in order to Ensure that the pressure reduction between pressure sensor 11 and pressure sensor 7 is obvious, usually require that between two pressure sensors Distant, this is relatively difficult to realize in some actual conditions, and data sensor line is also longer, and this is unfavorable.Setting After resistance criteria part 13, it is relatively near that two pressure sensors just can be arranged, and data wire is also shorter.Other and specific embodiment party Formula one is identical.

Specific embodiment three：The difference of present embodiment, present embodiment and specific embodiment one is described in conjunction with Fig. 3 It is the outlet in heat transferring medium two, the downstream of pressure sensor 9 is provided with pressure sensor 12.Simultaneously：

1st, the device external differential formula that modification calculates heat transferring medium two under fault-free operating mode is：

ΔP_s2(k)=P_9(k)-P_12(k)(1≤k≤M)

2nd, the device external differential formula that modification calculates the heat transferring medium two under actual operating mode is：

ΔP_s2=P₉-P₁₂

3 and change selected Δ P_s1(i)With Δ P_s2(k)Identification parameter as (i, k) operating mode.Carrying out actual motion work During the inquiry of condition corresponding fault-free operating mode, first in the fault-free device external differential data sequence Δ P of heat transferring medium one_s1(i)Middle lookup To the device external pressure difference data Δ P with actual operating mode_s1Size is closest to data, and records its searching number it is assumed that being n；Then Searching number for n value R_{V (n, k)}Find and run temperature difference ratio R in data sequence_vThe immediate data of size, and record it Another searching number is it is assumed that be m；Then have found fault-free operating mode (n, m) corresponding with this operating condition.

4th, increase the limit value α setting ratio of heat transfer coefficient II_2min.

Increase dirt or plugging fault diagnostic logic algorithm is as follows：

IfThen prompting dirt or blocking are slight.

IfThen prompting dirt or blocking are medium.

IfThen prompting dirt or blocking are serious.

If α₂＜ α_2min, then point out to report to the police, dirt or blocking cannot be born.

5th, increase restriction scope [the Δ α of the absolute value of difference setting ratio of heat transfer coefficient I and ratio of heat transfer coefficient II_1min, Δ α_2min]；In general, in the case of No leakage, α₁With α₂Should equal (or approximately equal), the two difference degree bigger, say Bright heat exchanger occurs the possibility of leakage also bigger.A kind of leak diagnostics logical algorithm supplementing is as follows：

(1) if Δ α_1min≤|α₁-α₂| ＜ Δ α_2min, then diagnosable and point out heat exchanger to may have occurred leakage；

(2) if α₁-α₂≥Δα_2min, then diagnosable and point out heat transferring medium one to heat transferring medium two leakage；

(3) if α₂-α₁≥Δα_2min, then diagnosable and point out heat transferring medium two to heat transferring medium one leakage；

Above data receiver, calculating the operation such as process, store, calling and all will complete inside fault diagnosis device 16.

The monitoring of other parameters, calculating, judgement are identical with specific embodiment one.

Specific embodiment four：As Fig. 4, present embodiment is with the difference of specific embodiment three, in pressure sensing It is provided with Pressure standards 13 between device 11 and pressure sensor 7, be provided between pressure sensor 12 and pressure sensor 9 Pressure standards 14.After setting resistance criteria part 13 and 14, pressure sensor 11 and 7, pressure sensor 12 just can set with 9 That puts is relatively near, data wire also shorter it is easy to implementing and connecting up.Other identical with specific embodiment three.

Specific embodiment five：Present embodiment is with the difference of specific embodiment three, four, and heat exchanger heat exchange is situated between Specified device external differential range delta P of matter one_s1dIt is divided into N number of interval, each interval takes the characteristic value Δ P of a device external differential_s1(i) (1≤i≤N)；Specified device external differential range delta P of heat transferring medium two_s2dIt is divided into M interval, each interval takes a device external pressure The characteristic value Δ P of difference_s2(k)(1≤k≤M).Present embodiment is easy to the division of fault-free operating mode, is adjusted and realize data monitoring. Other identical with specific embodiment three, four.

Claims (6)

1. a kind of heat exchanger method for diagnosing faults using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring,

Described included based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring：Heat transferring medium in heat exchanger (15) By near to the first temperature sensor (3) far setting gradually, first pressure sensor (7) and second pressure biography on one inlet pipeline Sensor (11), by near to the second temperature sensor far setting gradually on heat transferring medium one outlet conduit of heat exchanger (15) (4), the 3rd pressure sensor (8), by near to far set gradually the on heat transferring medium two inlet pipeline of heat exchanger (15) Three-temperature sensor (6) and the 4th pressure sensor (10), by closely extremely on heat transferring medium two outlet conduit of heat exchanger (15) The 4th temperature sensor (5) far setting gradually and the 5th pressure sensor (9)；The temperature signal output of four temperature sensors The signal output end of end and five pressure sensors is corresponded even with fault diagnosis device (16) corresponding signal interface respectively Connect；Fault diagnosis device (16) is used for data receiver, storage, calculating is processed, display and fault diagnosis are reported to the police；

Or, described based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring it is：On the basis of aforementioned system The system limiting further, the pipeline between first pressure sensor (7) and second pressure sensor (11) is provided with resistance Standard component (13)；

It is characterized in that：The detailed process of methods described is：

Step one, by metered flow scope V of heat exchanger heat transferring medium one_1dIt is divided into N number of interval, in N number of interval, each is interval All take traffic characteristic value V_1i, 1≤i≤N, metered flow scope V of heat transferring medium two_2dIt is divided into M interval, M interval In each interval all take traffic characteristic value V_2k, 1≤k≤M；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat transferring medium one Impedance limit ratio β_1max, impedance limit ratio β of heat transferring medium two_2max；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively reach The traffic characteristic value of each flow rate zone stable operation, record simultaneously and store the temperature and pressure parameter under operating mode, each temperature Degree sensor will record N × M data, and the first temperature sensor (3) will record altogether N × M data, and record symbol is t_3(i,k), represent that the first temperature sensor (3) is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium two is V_2kUnder the conditions of Temperature value, other temperature sensor data record symbol regulation identical with this；

First pressure sensor (7), the 3rd pressure sensor (8), second pressure sensor (11) will record N number of data, and second Pressure sensor (11) will record N number of data, and record symbol is P_11(i), represent second pressure sensor (11) in heat transferring medium one Flow be V_1iUnder the conditions of pressure value, first pressure sensor (7), the 3rd pressure sensor (8) data record symbol rule Fixed identical with this；

5th pressure sensor (9), the 4th pressure sensor (10) will record M data, and the 5th pressure sensor (9) will record M data, record symbol is P_9(k), represent that the 5th pressure sensor (9) is V in the flow of heat transferring medium two_2kUnder the conditions of pressure Force value, the record symbol regulation of the 4th pressure sensor (10) data is identical with this；

And carry out calculating the feature ginseng processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Number；And the device external pressure difference sequence △ P by heat transferring medium one_s1(i), temperature difference of heat exchanger ratio R_v(i,k)It is set as operating mode identification parameter；

, in actual moving process, fault diagnosis device transmits according to temperature sensor and pressure sensor for step 4, heat exchanger Real-time running data, carries out calculating process；And the correlation of corresponding operating mode under fault-free conditions is inquired according to operating mode identification parameter Data；And calculating in actual moving process is processed the characteristic parameter of the data heat exchanger corresponding with fault-free conditions obtaining Carry out ratio calculation to obtain diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and deviate Degree, to judge whether heat exchanger dirt, blocking, leakage failure, and fault degree.

2. the heat exchange using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring according to claim 1 Device method for diagnosing faults it is characterised in that：

In step 3, the detailed process carrying out calculating process by said temperature and pressure parameter in fault diagnosis device is：

The flow of heat transferring medium one is V_1i, the flow of heat transferring medium two is V_2kOperating mode be designated as (i, k), calculate under this operating mode Following parameter, and stored as the characteristic parameter of heat exchanger；1≤i≤N, 1≤k≤M；

The temperature difference of N × M heat transferring medium one：δt_1(i,k)=| t_3(i,k)-t_4(i,k)|, 1≤i≤N, 1≤k≤M；

The temperature difference of N × M heat transferring medium two：δt_2(i,k)=| t_5(i,k)-t_6(i,k)|, 1≤i≤N, 1≤k≤M；

N × M mean temperature difference：

N × M temperature difference ratio：

The device external pressure difference sequence of N number of heat transferring medium one：△P_s1(i)=P_11(i)-P_7(i), 1≤i≤N；

Pressure reduction in the device of N number of heat transferring medium one：△P_h1(i)=P_7(i)-P_8(i), 1≤i≤N；

Pressure reduction in the device of M heat transferring medium two：△P_h2(k)=P_6(k)-P_5(k), 1≤k≤M；

The device external pressure difference sequence of M heat transferring medium two：Take thermal medium first-class Measure as V_1NWhen data calculated；

N × M intermediate parameters：

N × M intermediate parameters：

N number of intermediate parameters：

M intermediate parameters：

Above parameter will be stored in fault diagnosis device (16), and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select △ P_s1(i)And R_v(i,k)Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature after heat exchanger comes into operation and five pressures in real time Force value, the record symbol of the data that the first temperature sensor (3) monitored in certain moment is t₃, second pressure sensor (11) prison The record symbol of the data measuring is P₁₁, other temperature sensors and the record symbol of pressure sensor specify identical with this；Right This nine data monitoring every time carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference：

Temperature difference ratio：

The device external differential of heat transferring medium one：△P_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：△P_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：△P_h2=P₆-P₅；

The device external differential of heat transferring medium two：

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquiry actual operating mode corresponding fault-free operating mode：First outside the fault-free device of heat transferring medium one Pressure reduction sequence △ P_s1(i)In find device external differential △ P with actual operating mode_s1Size is closest to data, and records its inspection Rope number is it is assumed that be n；Then searching number for n value R_v(n,k)Find and run temperature difference ratio R in data sequence_vSize connects most Near data, and record its another searching number it is assumed that being m；Then find fault-free operating mode corresponding with actual operating mode (n,m)；

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval to after actual operating mode corresponding fault-free operating mode, Recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and degree will be used for Diagnosis：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、β₁、β₂1 or closely 1 all should be equal to；Heat exchanger has After dirt or blocking, α₁To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁And β₂Will be greater than 1, And deviate 1 more remote, illustrate that dirt or blocking are more serious；The diagnosis of dirt and plugging fault can be carried out according to this principle, And the judgement of fault degree, specifically diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁>β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂>β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, take following logical algorithm：

(1) if δ is t_1(n,m)＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_1(n,m)＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_2(n,m)＜ δ t₂, then prompting heat transferring medium two may leakage；

(4) if δ is t_2(n,m)＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

Above data receiver, calculating process, store, call operation all will complete inside fault diagnosis device (16).

3. a kind of heat exchanger method for diagnosing faults using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring,

Described included based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring：Heat transferring medium in heat exchanger (15) By near to the first temperature sensor (3) far setting gradually, first pressure sensor (7) and second pressure biography on one inlet pipeline Sensor (11), by near to the second temperature sensor far setting gradually on heat transferring medium one outlet conduit of heat exchanger (15) (4), the 3rd pressure sensor (8), by near to far set gradually the on heat transferring medium two inlet pipeline of heat exchanger (15) Three-temperature sensor (6) and the 4th pressure sensor (10), by closely extremely on heat transferring medium two outlet conduit of heat exchanger (15) The 4th temperature sensor (5) far setting gradually and the 5th pressure sensor (9)；The temperature signal output of four temperature sensors The signal output end of end and five pressure sensors is corresponded even with fault diagnosis device (16) corresponding signal interface respectively Connect；Fault diagnosis device (16) is used for data receiver, storage, calculating is processed, display and fault diagnosis are reported to the police；In heat exchanger (15) 6th pressure sensor (12) is additionally arranged on heat transferring medium two outlet conduit；4th temperature sensor (5), the 5th pressure sensor (9), the 6th pressure sensor (12) by near to far setting gradually；

Or, described based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring it is：On the basis of aforementioned system The system limiting further, the pipeline between first pressure sensor (7) and second pressure sensor (11) is provided with resistance Power standard component (13), is provided with resistance mark on the pipeline between the 5th pressure sensor (9) and the 6th pressure sensor (12) Quasi- part (14)；

It is characterized in that：The detailed process of methods described is：

Step one, by metered flow scope V of heat exchanger heat transferring medium one_1dIt is divided into N number of interval, in N number of interval, each is interval All take traffic characteristic value V_1i, 1≤i≤N, metered flow scope V of heat transferring medium two_2dIt is divided into M interval, M interval In each interval all take traffic characteristic value V_2k, 1≤k≤M；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat transferring medium one Impedance limit ratio β_1max, impedance limit ratio β of heat transferring medium two_2max；The limit value α of ratio of heat transfer coefficient II_2min, ratio of heat transfer coefficient I with Restriction scope [the △ α of the absolute value of the difference of ratio of heat transfer coefficient II_1min, △ α_2min]；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively reach The traffic characteristic value of each flow rate zone stable operation, record simultaneously and store the temperature and pressure parameter under operating mode, each temperature Degree sensor will record N × M data, and the first temperature sensor (3) will record altogether N × M data, and record symbol is t_3(i,k), represent that the first temperature sensor (3) is V in the flow of heat transferring medium one_1i, the flow of heat transferring medium two is V_2kUnder the conditions of Temperature value, other temperature sensor data record symbol regulation identical with this；

First pressure sensor (7), the 3rd pressure sensor (8), second pressure sensor (11) will record N number of data, and second Pressure sensor (11) will record N number of data, and record symbol is P_11(i), represent second pressure sensor (11) in heat transferring medium one Flow be V_1iUnder the conditions of pressure value, first pressure sensor (7), the 3rd pressure sensor (8) data record symbol rule Fixed identical with this；

5th pressure sensor (9), the 4th pressure sensor (10), the 6th pressure sensor (12) will record M data, and the 6th Pressure sensor (12) will record M data, and record symbol is P_12(k), represent the 6th pressure sensor (12) in heat transferring medium two Flow be V_2kUnder the conditions of pressure value, the 5th pressure sensor (9), the 4th pressure sensor (10) data record symbol rule Fixed identical with this；

And carry out calculating the feature ginseng processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Number；And the device external pressure difference sequence △ P by heat transferring medium one_s1(i), temperature difference of heat exchanger ratio R_v(i,k)It is set as operating mode identification parameter；

, in actual moving process, fault diagnosis device transmits according to temperature sensor and pressure sensor for step 4, heat exchanger Real-time running data, carries out calculating process；And the correlation of corresponding operating mode under fault-free conditions is inquired according to operating mode identification parameter Data；And calculating in actual moving process is processed the characteristic parameter of the data heat exchanger corresponding with fault-free conditions obtaining Carry out ratio calculation to obtain diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and deviate Degree, to judge whether heat exchanger dirt, blocking, leakage failure, and fault degree.

4. the heat exchange using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring according to claim 3 Device method for diagnosing faults it is characterised in that：

In step 3, the detailed process carrying out calculating process by said temperature and pressure parameter in fault diagnosis device is：

The flow of heat transferring medium one is V_1i, the flow of heat transferring medium two is V_2kOperating mode be designated as (i, k), calculate under this operating mode Following parameter, and stored as the characteristic parameter of heat exchanger：1≤i≤N, 1≤k≤M；

The temperature difference of N × M heat transferring medium one：δt_1(i,k)=| t_3(i,k)-t_4(i,k)|, 1≤i≤N, 1≤k≤M；

The temperature difference of N × M heat transferring medium two：δt_2(i,k)=| t_5(i,k)-t_6(i,k)|, 1≤i≤N, 1≤k≤M；

N × M mean temperature difference：

N × M temperature difference ratio：

The device external pressure difference sequence of N number of heat transferring medium one：△P_s1(i)=P_11(i)-P_7(i), 1≤i≤N；

Pressure reduction in the device of N number of heat transferring medium one：△P_h1(i)=P_7(i)-P_8(i), 1≤i≤N；

Pressure reduction in the device of M heat transferring medium two：△P_h2(k)=P_6(k)-P_5(k), 1≤k≤M；

The device external pressure difference sequence of M heat transferring medium two：△P_s2(k)=P_9(k)-P_12(k), 1≤k≤M；

N × M intermediate parameters：

N × M intermediate parameters：

N number of intermediate parameters：

M intermediate parameters：

Above parameter will be stored in fault diagnosis device (16), and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select △ P_s1(i)And R_v(i,k)Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature after heat exchanger comes into operation and six pressures in real time Force value, the record symbol of the data that the first temperature sensor (3) monitored in certain moment is t₃, the 6th pressure sensor (12) prison The record symbol of the data measuring is P₁₂, other temperature sensors and the record symbol of pressure sensor specify identical with this；Right This 10 data monitoring every time carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference：

Temperature difference ratio：

The device external differential of heat transferring medium one：△P_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：△P_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：△P_h2=P₆-P₅；

The device external differential of heat transferring medium two：△P_s2=P₉-P₁₂；

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquiry actual operating mode corresponding fault-free operating mode：First outside the fault-free device of heat transferring medium one Pressure reduction sequence △ P_s1(i)In find device external differential △ P with actual operating mode_s1Size is closest to data, and records its inspection Rope number is it is assumed that be n；Then searching number for n value R_v(n,k)Find and run temperature difference ratio R in data sequence_vSize connects most Near data, and record its another searching number it is assumed that being m；Then have found fault-free work corresponding with actual operating mode Condition (n, m)；

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval to after actual operating mode corresponding fault-free operating mode, Recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and degree will be used for Diagnosis：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、α₂、β₁、β₂1 or closely 1 all should be equal to；Heat exchanger After having dirt or blocking, α₁Or α₂To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁And β₂Will More than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；In the case of No leakage, α₁With α₂Should equal or approximate phase Deng, the two difference degree bigger, illustrate heat exchanger occur leak possibility also bigger；Can be carried out according to this principle Dirt and the diagnosis of plugging fault, and the judgement of fault degree, concrete diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₂＜ α_2min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁>β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂>β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, take following logical algorithm：

(1) if δ is t_1(n,m)＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_1(n,m)＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_2(n,m)＜ δ t₂, then prompting heat transferring medium two may leakage；

(4) if δ is t_2(n,m)＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

In combination with following leak diagnostics logical algorithm：

(1) if △ is α_1min≤|α₁-α₂| ＜ △ α_2min, then diagnose and point out heat exchanger to may have occurred leakage；

(2) if α₁-α₂≥△α_2min, then diagnose and point out heat transferring medium one to heat transferring medium two leakage；

(3) if α₂-α₁≥△α_2min, then diagnose and point out heat transferring medium two to heat transferring medium one leakage；

Above data receiver, calculating process, store, call operation all will complete inside fault diagnosis device (16).

5. a kind of heat exchanger method for diagnosing faults using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring,

Described included based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring：Heat transferring medium in heat exchanger (15) By near to the first temperature sensor (3) far setting gradually, first pressure sensor (7) and second pressure biography on one inlet pipeline Sensor (11), by near to the second temperature sensor far setting gradually on heat transferring medium one outlet conduit of heat exchanger (15) (4), the 3rd pressure sensor (8), by near to far set gradually the on heat transferring medium two inlet pipeline of heat exchanger (15) Three-temperature sensor (6) and the 4th pressure sensor (10), by closely extremely on heat transferring medium two outlet conduit of heat exchanger (15) The 4th temperature sensor (5) far setting gradually and the 5th pressure sensor (9)；The temperature signal output of four temperature sensors The signal output end of end and five pressure sensors is corresponded even with fault diagnosis device (16) corresponding signal interface respectively Connect；Fault diagnosis device (16) is used for data receiver, storage, calculating is processed, display and fault diagnosis are reported to the police；In heat exchanger (15) 6th pressure sensor (12) is additionally arranged on heat transferring medium two outlet conduit；4th temperature sensor (5), the 5th pressure sensor (9), the 6th pressure sensor (12) by near to far setting gradually；

Or, described based on the heat exchanger fault diagnosis system of temperature and pressure signal monitoring it is：On the basis of aforementioned system The system limiting further, the pipeline between first pressure sensor (7) and second pressure sensor (11) is provided with resistance Power standard component (13), is provided with resistance mark on the pipeline between the 5th pressure sensor (9) and the 6th pressure sensor (12) Quasi- part (14)；

It is characterized in that, the detailed process of methods described is：

Step one, by the specified device external differential scope △ P of heat exchanger heat transferring medium one_s1dIt is divided into N number of interval, each interval takes The characteristic value of one device external differential constitutes device external pressure difference sequence △ P_s1(i), 1≤i≤N；The specified device external differential model of heat transferring medium two Enclose △ P_s2dIt is divided into M interval, each interval takes the characteristic value of a device external differential to constitute device external pressure difference sequence △ P_s2(k), 1≤ k≤M；

Step 2, the setting judging limit value of diagnosis ratio parameter：Set the limit value α of ratio of heat transfer coefficient I_1min, heat transferring medium one Impedance limit ratio β_1max, impedance limit ratio β of heat transferring medium two_2max；The limit value α of ratio of heat transfer coefficient II_2min, ratio of heat transfer coefficient I with Restriction scope [the △ α of the absolute value of the difference of ratio of heat transfer coefficient II_1min, △ α_2min]；

Step 3, under heat exchanger fault-free conditions, adjust heat exchanger, realize heat transferring medium one and heat transferring medium two respectively reach The interval characteristic value of device external differential of each device external differential stable operation, record simultaneously and store the temperature and pressure ginseng under operating mode Number, each temperature sensor will record N × M data, and temperature sensor (3) will record altogether N × M data, record symbol For t_3(i,k), represent that temperature sensor (3) is △ P in the device external pressure difference sequence of heat transferring medium one_s1(i), outside the device of heat transferring medium two Pressure reduction sequence is △ P_s2(k)Under the conditions of temperature value, other temperature sensor data record symbol regulation identical with this；

First pressure sensor (7), the 3rd pressure sensor (8), second pressure sensor (11) will record N number of data, and second Pressure sensor (11) will record N number of data, and record symbol is P_11(i), represent second pressure sensor (11) in heat transferring medium one Device external pressure difference sequence be △ P_s1(i)Under the conditions of pressure value, first pressure sensor (7), the 3rd pressure sensor (8) data Record symbol regulation identical with this；

5th pressure sensor (9), the 4th pressure sensor (10), the 6th pressure sensor (12) will record M data, and the 6th Pressure sensor (12) will record M data, and record symbol is P_12(k), represent the 6th pressure sensor (12) in heat transferring medium two Device external pressure difference sequence be △ P_s2(k)Under the conditions of pressure value, the 5th pressure sensor (9), the 4th pressure sensor (10) data Record symbol regulation identical with this；

And carry out calculating the feature ginseng processing and saving as heat exchanger by said temperature and pressure parameter in fault diagnosis device Number；And the device external pressure difference sequence △ P by heat transferring medium one_s1(i), the device external pressure difference sequence △ P of heat transferring medium two_s2(k)It is set as work Condition identification parameter；

, in actual moving process, fault diagnosis device transmits according to temperature sensor and pressure sensor for step 4, heat exchanger Real-time running data, carries out calculating process；And the correlation of corresponding operating mode under fault-free conditions is inquired according to operating mode identification parameter Data；And calculating in actual moving process is processed the characteristic parameter of the data heat exchanger corresponding with fault-free conditions obtaining Carry out ratio calculation to obtain diagnosing ratio parameter；

Step 5, the magnitude relationship judging limit value according to diagnosis ratio parameter and the diagnosis ratio parameter setting, and deviate Degree, to judge whether heat exchanger dirt, blocking, leakage failure, and fault degree.

6. the heat exchange using the heat exchanger fault diagnosis system based on temperature and pressure signal monitoring according to claim 5 Device method for diagnosing faults it is characterised in that：

In step 3, the detailed process carrying out calculating process by said temperature and pressure parameter in fault diagnosis device is：

The characteristic value of the device external differential of heat transferring medium one is △ P_s1(i), the characteristic value of the device external differential of heat transferring medium two is △ P_s2(k)Operating mode be designated as (i, k), 1≤i≤N, 1≤k≤M, calculate the following parameter under this operating mode, and the feature as heat exchanger Parameter is stored：

The temperature difference of N × M heat transferring medium one：δt_1(i,k)=| t_3(i,k)-t_4(i,k)|, 1≤i≤N, 1≤k≤M；

The temperature difference of N × M heat transferring medium two：δt_2(i,k)=| t_5(i,k)-t_6(i,k)|, 1≤i≤N, 1≤k≤M；

N × M mean temperature difference：

N × M temperature difference ratio：

The device external pressure difference sequence of N number of heat transferring medium one：△P_s1(i)=P_11(i)-P_7(i), 1≤i≤N；

Pressure reduction in the device of N number of heat transferring medium one：△P_h1(i)=P_7(i)-P_8(i), 1≤i≤N；

Pressure reduction in the device of M heat transferring medium two：△P_h2(k)=P_6(k)-P_5(k), 1≤k≤M；

The device external pressure difference sequence of M heat transferring medium two：△P_s2(k)=P_9(k)-P_12(k), 1≤k≤M；

N × M intermediate parameters：

N × M intermediate parameters：

N number of intermediate parameters：

M intermediate parameters：

Above parameter will be stored in fault diagnosis device (16), and the characteristic constant as this heat exchanger should in follow-up diagnosis With, and select △ P_s1(i)With △ P_s2(k)Identification parameter as (i, k) operating mode；

The detailed process realizing step 4 is：

Step 4 (one), Monitoring Data processing when running：Survey four temperature after heat exchanger comes into operation and six pressures in real time Force value, the record symbol of the data that the first temperature sensor (3) monitored in certain moment is t₃, the 6th pressure sensor (12) prison The record symbol of the data measuring is P₁₂, other temperature sensors and the record symbol of pressure sensor specify identical with this；Right This 10 data monitoring every time carry out process is calculated as below：

The temperature difference of heat transferring medium one：δt₁=| t₃-t₄|；

The temperature difference of heat transferring medium two：δt₂=| t₅-t₆|；

Mean temperature difference：

Temperature difference ratio：

The device external differential of heat transferring medium one：△P_s1=P₁₁-P₇；

Pressure reduction in the device of heat transferring medium one：△P_h1=P₇-P₈；

Pressure reduction in the device of heat transferring medium two：△P_h2=P₆-P₅；

The device external differential of heat transferring medium two：△P_s2=P₉-P₁₂；

Intermediate parameters： $B_1=\sqrt{{\mathrm{\ΔP}}_{s1}}\·\frac{{\mathrm{\δt}}_1}{{\mathrm{\Δt}}_m};$

$B_2=\sqrt{{\mathrm{\ΔP}}_{s2}}\·\frac{{\mathrm{\δt}}_2}{{\mathrm{\Δt}}_m};$

$D_1=\frac{{\mathrm{\ΔP}}_{h1}}{{\mathrm{\ΔP}}_{s1}};$

$D_2=\frac{{\mathrm{\ΔP}}_{h2}}{{\mathrm{\ΔP}}_{s2}};$

Step 4 (two), inquiry actual operating mode corresponding fault-free operating mode：First in the device external differential sequence of heat transferring medium one Row △ P_s1(i)In find device external differential △ P with actual operating mode_s1Size is closest to data, and records its searching number, false It is set to n；Then in the device external pressure difference sequence △ P of heat transferring medium two_s2(k)In find device external differential △ with actual operating mode P_s2Size is closest to data, and records its searching number it is assumed that being m；Then find fault-free work corresponding with actual operating mode Condition (n, m)；

Step 4 (three), calculating fault diagnosis ratio parameter：Retrieval to after actual operating mode corresponding fault-free operating mode, Recall the characteristic parameter of heat exchanger under this fault-free working condition, and calculate following parameter, fault category and degree will be used for Diagnosis：

Ratio of heat transfer coefficient I：

Ratio of heat transfer coefficient II：

Heat transferring medium one impedance ratio：

Heat transferring medium two impedance ratio：

The detailed process realizing step 5 is：

If heat exchanger does not have dirt or does not block, then α₁、α₂、β₁、β₂1 or closely 1 all should be equal to；Heat exchanger After having dirt or blocking, α₁Or α₂To less than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；β₁And β₂Will More than 1, and deviate 1 more remote, illustrate that dirt or blocking are more serious；In the case of No leakage, α₁With α₂Should equal or approximate phase Deng, the two difference degree bigger, illustrate heat exchanger occur leak possibility also bigger；Can be carried out according to this principle Dirt and the diagnosis of plugging fault, and the judgement of fault degree, concrete diagnosis process is as follows：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₁＜ α_1min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThen prompting dirt or block as slight；

IfThen prompting dirt or block as medium；

IfThen prompting dirt or block as serious；

If α₂＜ α_2min, then point out to report to the police, dirt or blocking cannot be born；

Logical algorithm in combination with following dirt or blocking diagnosis：

IfThe then prompting dirt of heat transferring medium side or block as slight；

IfThe then prompting dirt of heat transferring medium side or block as medium；

IfThe then prompting dirt of heat transferring medium side or block as serious；

If β₁>β_1max, then point out to report to the police, the dirt of heat transferring medium side or blocking cannot be born；

In the same manner：

IfThe then prompting dirt of heat transferring medium two side or block as slight；

IfThe then prompting dirt of heat transferring medium two side or block as medium；

IfThe then prompting dirt of heat transferring medium two side or block as serious；

If β₂>β_2max, then point out to report to the police, the dirt of heat transferring medium two side or blocking cannot be born；

With regard to revealing fault diagnosis, take following logical algorithm：

(1) if δ is t_1(n,m)＜ δ t₁, then prompting heat transferring medium one may leakage；

(2) if δ is t_1(n,m)＜ δ t₁, and β₁＜ 1, then point out heat transferring medium one to reveal to heat transferring medium two；

(3) if δ is t_2(n,m)＜ δ t₂, then prompting heat transferring medium two may leakage；

(4) if δ is t_2(n,m)＜ δ t₂, and β₂＜ 1, then point out heat transferring medium two to reveal to heat transferring medium one；

In combination with following leak diagnostics logical algorithm：

(1) if △ is α_1min≤|α₁-α₂| ＜ △ α_2min, then diagnose and point out heat exchanger to may have occurred leakage；

(2) if α₁-α₂≥△α_2min, then diagnose and point out heat transferring medium one to heat transferring medium two leakage；

(3) if α₂-α₁≥△α_2min, then diagnose and point out heat transferring medium two to heat transferring medium one leakage；

Above data receiver, calculating process, store, call operation all will complete inside fault diagnosis device (16).