CN107917094B - A kind of blast furnace blower anti-surge control method - Google Patents
A kind of blast furnace blower anti-surge control method Download PDFInfo
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- CN107917094B CN107917094B CN201610876370.0A CN201610876370A CN107917094B CN 107917094 B CN107917094 B CN 107917094B CN 201610876370 A CN201610876370 A CN 201610876370A CN 107917094 B CN107917094 B CN 107917094B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The present invention relates to be related to a kind of blast furnace blower anti-surge control method, to make air blower overcome the disturbance of high furnace side unusual service condition, propose the analysis using blast furnace Lateral supply duct survey data for the first time to optimize the thinking of anti-asthma control loop, lead to surge generation in searching measurement parameter interferes significantly with the factor, a kind of Regulation against surge device feedforward mathematical model is provided, interference volume is introduced directly into anti-asthma control system after calculating, make regulator loop on the basis that former closed loop feedback is adjusted, influence of the interference factor to blower unit is overcome in advance, obtain accurate regulating effect much sooner.
Description
Technical field
The present invention relates to a kind of control methods, and in particular to a kind of blast furnace blower technical field of control method.
Background technique
Air blower is responsible for the task to blast furnace air feed, is the core drive equipment in iron and steel enterprise's ironmaking processes, steady
Fixed safe operation, is directly related to the normal production of blast furnace ironmaking.Blower surge is the inherent characteristic of turbo compressor machinery, it
Essence is that air-flow separates in blower leaf grating, further generates the violent low frequency pulsating of air-flow, and aerodynamic parameter tempestuously changes,
Causing the vibration and shake that blade is violent, surge endangers extremely seriously caused by axis stream compression fan, once surge mechanism is sent out
Adverse current is transformed into, air blower can be made to damage in a very short period of time, therefore precedent busy in each national capital.Therefore Anti-surge Control is air blower
Most important control and protection system in many controls of group.
After blower unit equipment is installed, manufacturer needs to carry out blower surge test, determines anti-surge line, Fig. 1
Air blower anti-surge performance diagram, Fig. 2 are antisurge control system schematic diagram.In conjunction with the dotted line frame in Fig. 1, Fig. 2, work as unit
Inlet throat pressure difference 10 is certain value, calculates a corresponding pressure value by anti-asthma polygronal function device 14, this pressure value is exactly
The setting value 17 of antisurge control system PID regulator 15.The wind pressure 9 that goes out of air blower outlet is converted by pressure transmitter
It is sent into the measured value 16 of PID regulator 15 at current signal, is compared with setting value 17, if being less than setting value, controller
4 milliamperes of signals are exported, two anti-asthma valves 8 are all closed, and cause pressure to rise when discharge pressure changes, is more than setting value,
The output of PID regulator 15 increases, and opens two anti-asthma valves 8 according to the ratio of adjusting, declines fan discharge pressure, while monitoring drum
Fans entrance throat pressure difference 10, if surge mechanism further develops, as shown in Fig. 3 blower unit protection flow chart dotted line frame,
It is zero when throat pressure difference 10 is for 1 seconds, then can issues surge sound-light alarm, if for 3 seconds again remain zero, blower enters peace
Full operating status, two anti-asthma valves 8 of standard-sized sheet close outlet air non-return flap 3, close stator blade 27 to minimum angles.Herein on basis,
If throat pressure difference 10 is for 5 seconds again to remain zero, sending is continued adverse current halt instruction by blower, and unit emergency shutdown avoids
Continue the adverse current damage of the destructiveness caused by unit.
Blower surge is caused there are two aspect reasons, internally, strong mutability rotating stall occurs in leaf grating；From outside
For, in actual production, axial-flow type compression blower always works together together with pipe network, and blast furnace air supply system is in addition to air blast
Except machine, there are also the various valves in hot-blast stove, cold air duct, hot air duct, mixing wind tube road, gas piping and pipeline,
Up in thousands of meters of air supply duct, any one link occurs abnormal, it will and so that pipe network capacity and pepeline characteristic is changed,
Then the influence to blower unit is generated.In addition the blast furnace especially small blast furnace working of a furnace is fast changing, when operation of blast furnace exception,
When appearance " hanging ", " collapse material ", air quantity can not swimmingly penetrate the blast furnace bed of material, lead to the quick variation of wind pressure, when
When gas pressure in pipe network is greater than blower export pressure, the gas in pipe network will flow backwards air blower, if this situation continues
It repeated, just cause blower surge.Therefore external cause is more than internal cause, retrospect Mei Gang company number Fans asthma the reason of blower surge
Vibration even shut down the reason of, almost 100% be all external factor influence, have because blast furnace collapse material cause abrupt changing air pressuer, have because
Hot-blast stove intake stack valve is closed suddenly during changing furnace, is had because system power loss causes blast furnace emergency vent valve can not
Open etc..Mei Gang company cause of accident several times is summarized, the anti-surge control method of original manufacturer design does not adapt to complexity
Changeable external factor influences.Therefore preventing fan from surging design is other than protecting equipment of itself, more to take into account that provide for blast furnace can
The production service leaned on, when operating condition is abnormal, it is desirable to operating condition can be retracted to normal work model by acting anti-asthma regulating loop
It encloses, avoids the further expansion of surge mechanism, and when the high irreversible abnormal conditions of furnace side generation occur, it is desirable to air blower
Group can shut down the damage for avoiding blower in time.
Summary of the invention
To solve the above problems, the invention discloses a kind of blast furnace blower anti-surge control method, the party
The purpose of method is the disturbance that air blower can be allowed to overcome high furnace side unusual service condition within first time, proposes utilize monitoring for the first time
Optimize the thinking of anti-asthma control loop with analysis blast furnace Lateral supply duct survey data, finding in measurement parameter causes surge to be sent out
Raw interferes significantly with the factor, provides a kind of Regulation against surge device feedforward mathematical model, and interference volume is introduced directly into after calculating
Anti-asthma control system makes regulator loop on the basis that former closed loop feedback is adjusted, and using the effect of feedforward, overcomes in advance dry
The influence of factor pair blower unit is disturbed, accurate regulating effect much sooner is obtained.Simultaneously in the case where interference can not be overcome,
By logic judgment, blower is set to enter safe operation or urgent protection shutdown in time, it is ensured that fan safe.
To achieve the goals above, technical scheme is as follows, a kind of blast furnace blower anti-surge control method,
It is characterized in that, the described method comprises the following steps: Step 1: comprehensive analysis summarizes high furnace side unusual service condition, being determined to represent
High furnace side operating condition is abnormal major parameter when variation, and the parameter is as follows: air-supply wind speed, blast pressure, air flow rate, into
Carbon monoxide content before air temperature, hot-blast stove air inlet valve；Step 2: end, high furnace side hot wind in blower unit air supply duct
Before furnace air inlet valve, installation air-supply wind speed, blast pressure, air flow rate, five inlet air temperature, carbon monoxide content one-shot measurement members
Part is converted into 4-20 milliamperes of current signals by transmitter, is sent into blower unit antisurge control system, is monitored；Wherein
The measurement of inlet air temperature uses fast thermocouple measuring cell, has the advantages that measurement accuracy height, fast response time；
Step 3: carrying out the calculating and acquisition of related data；
Step 4: carrying out blower surge test, while blower anti-asthma control using adjustment static blade angle and hot-blast stove vent valve
Device output processed is set to manually, carries out 6 tests altogether, and static blade angle is separately adjusted to angularly 30 degree, 39 degree, 48 degree, 55 degree, 60 degree, 68
Degree.In test, when blower is close to stall margin, blower pressure at expulsion tabular value declines rapidly, then press manual safety operation by
Button closes stator blade and non-return flap, opens anti-asthma valve, thus obtains 6 operating points.This six works are acquired in DCS historical record
Blower pressure at expulsion is zero throat pressure difference change rate, the air-supply wind speed change rate, air-supply in first 2.5 seconds every 0.5 second in condition point
Pressure change rate, air flow rate change rate, inlet air temperature change rate, carbon monoxide content change rate amount to 30 groups of data, and right
This 30 groups of data carry out test of normality, it is ensured that the data returned in calculating are normal distributions.
Step 5: concluding that supply air temperature, air-supply wind speed by regressing calculation according to the 30 groups of test datas obtained
It is the significant factor that surge occurs, and obtains regression equation
Wherein P ': throat pressure difference change rate；S': air-supply wind speed change rate；T ': supply air temperature change rate；
Step 6: introducing feed-forward control signals: place where troops were originally stationed asthma control system is the setting for obtaining pressure at expulsion and anti-asthma line
Anti-asthma valve is adjusted in the deviation that value compares, and belongs to closed loop feedback adjusting, its main feature is that there is deviation in controlled variable
It is just adjusted afterwards.If interference has occurred and that, without generating deviation, adjuster not will do it work.Therefore feedback controling mode
Adjustment effect lag behind interference effect.Inventor is by regression equation
It is introduced into the PID regulator of anti-asthma control system as feedforward mathematical model, becomes the feedforward input of adjuster, such blast furnace
Side is introduced directly into anti-asthma control system to the interference volume of air blower after mathematical model calculates, and PID regulator circuit is made to exist
On the basis that former closed loop feedback is adjusted, feed-forward regulation effect is increased, capable of overcoming wind speed, wind-warm syndrome in advance, the two are significant dry
The influence of factor pair blower unit is disturbed, accurately regulating effect is obtained much sooner.
Step 7: the determination of feedforward barring condition, the Combining soft control strategy in anti-asthma control system, limit feedforward action and throw
Enter condition, blower is thus avoided normally to add wind, checking, change anti-asthma caused by the normal data variation of interference factor during wind
Valve events.
As an improvement of the present invention, in the step 3, since throat pressure difference signal is directly whether to reflect blower
Into the most important signal of surge, and in view of the rapidity that surge occurs, therefore more can with its every 0.5 second change rate
The operating condition variation for reflecting blower, carries out numerical analysis to throat pressure difference in antisurge control system, calculates larynx difference every 0.5
The rate of change of second: throat pressure difference delay value is obtained using computing module DEADTIME, delay time is set as 0.5 second.By larynx
Portion's differential pressure actual value subtracts 0.5 second delay value of throat pressure difference, just obtains the every 0.5 second rate of change of larynx difference；Meanwhile it utilizing
Same method counts the measurement data such as air-supply wind speed, blast pressure, air flow rate, inlet air temperature, carbon monoxide content
It is worth analytical calculation, calculates their every 0.5 second rate of changes；Adopting for historical data is carried out to the change rate of this six measuring points
Collection.
As an improvement of the present invention, in the step 7, the Combining soft control strategy in anti-asthma control system is limited
Feedforward action allows investment condition:
(1) the every 0.5 second change rate of air flow rate is greater than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is greater than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is greater than 3.5m；
(4) static blade angle is between 23 degree to 68 degree；
(5) measuring signal air-supply wind speed and supply air temperature state are all normal.
As an improvement of the present invention, in the step 7, Combining soft control strategy, when DCS system detects following shape
When state:
(1) the every 0.5 second change rate of air flow rate is less than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is less than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is less than 3.5m；
(4) static blade angle exceeds 23 degree to 68 degree；
(5) there is measurement bad point in measuring signal air-supply wind speed or supply air temperature；
(6) operator releases feedforward action manually；
The feedforward of PID controller is ineffective, and the closed loop feedback that anti-asthma control loop restores simple is adjusted.
As an improvement of the present invention, in the step 7, after step 1 to step 7, blower is because high
In the case that the surge that furnace side work condition abnormality causes still can not overcome, increases in original machine group anti-surge reverse current protection logic and protect
Control logic is protected, so that blower is entered safe operation or urgent protection shutdown in time, it is ensured that fan safe is supplemented as follows:
(1) the air-supply every 0.5 second change rate of wind-warm syndrome, which is greater than 60 DEG C and exports the air-supply every 0.5 second change rate of wind speed, is greater than 7m,
Two conditions reach, and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed, anti-asthma valve standard-sized sheet.
(2) on the basis of (1), if two conditions are reached and are continued for 5 seconds, blower emergency shutdown.
(3) carbon monoxide content is more than 3% and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed,
Anti-asthma valve standard-sized sheet；Herein on basis, carbon monoxide content is more than 3% and continues for 5 seconds, blower emergency shutdown.
The above relay protective scheme is equipped with throwing and moves back button, and behaviour is moved back in the throwing that operator can be protected according to actual production situation
Make.
Compared with the existing technology, advantages of the present invention is as follows, and 1) it is of the invention possible for the unusual service condition in operation of blast furnace
Caused blower surge phenomenon is studied, and is proposed the monitoring using blast furnace Lateral supply duct survey data for the first time and is divided
It analyses to optimize the thinking of anti-asthma control loop, searching out leads to the significant dry of blower surge generation in high furnace side primary measured parameter
The factor is disturbed, and derives calculation formula, thus to obtain the feed-forward signal in regulating loop, interference of the furnace side high in this way to air blower
Amount is introduced directly into anti-asthma control system after calculating, and on the basis that former closed loop feedback is adjusted, increases feed-forward regulation
Effect can allow air blower to overcome the disturbance of high furnace side unusual service condition within first time, obtain and breathe heavily adjusting control system than place where troops were originally stationed
System more quickly with accurately regulating effect, makes blower be quickly returning to nominal situation, and blower is avoided to enter safe operation or even stop
Machine breaks wind to cause blast furnace.2) present invention augments blower anti-surging protection logic, can not when high furnace side generation occurs
The abnormal conditions of reverse increase relay protective scheme in the case where anti-asthma regulating loop can not overcome interference, prior to former simple
By the anti-surge reverse current protection logic that throat pressure difference judges, blower is made to rapidly enter safe operation or urgent protection shutdown,
Ensure fan safe.For above method other than increasing by five one-shot measurement elements, remaining method can be in existing anti-surge control
It is realized in system processed, amount of investment is small, and transformation is convenient.
Detailed description of the invention
Fig. 1 is the air blower anti-surge performance diagram of the embodiment of the present invention 1；
Fig. 2 is the blower unit antisurge control system schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the blower unit protection flow chart of the embodiment of the present invention 1；
Fig. 4 is the surge test data variation rate acquisition of Application Example 1 of the present invention；
In figure: 1- steam turbine, 2- air blower, 3- outlet air non-return flap, 4- blow valve, 5- hot-blast stove air inlet valve, 6- hot-blast stove,
7- blast furnace, 8- anti-asthma valve, 9- pressure at expulsion, 10- throat pressure difference two from three, the electronic vent valve of 11-, 12- muffler, 13- anti-asthma
Control system, 14- anti-asthma polygronal function device, 15-PID adjuster, 16-PID adjuster measured value input terminal, 17-PID are adjusted
Device setting value input terminal, 18-PID adjuster feedforward input terminal, 19- feedforward mathematical model, 20- air-supply wind speed, 21- air-supply wind
Pressure, 22- air-supply air quantity, 23- inlet air temperature, 24- carbon monoxide content, 25- air supply duct, 26- hot-blast stove vent valve, 27- are quiet
Leaf regulating device.
Specific embodiment
In order to further enhance the appreciation and understanding of the invention, with reference to the accompanying drawings and detailed description, this is furtherd elucidate
Invention.
Embodiment 1: a kind of blast furnace blower anti-surge control method the described method comprises the following steps: Step 1: comprehensive
The high furnace side unusual service condition of analysis and summary is determined to represent major parameter when high furnace side operating condition is abnormal variation, the ginseng
Number is as follows: carbon monoxide content before air-supply wind speed, blast pressure, air flow rate, inlet air temperature, hot-blast stove air inlet valve；
Step 2: before the end of blower unit air supply duct, high furnace side hot-blast stove air inlet valve, installation air-supply wind speed is sent
Five wind pressure, air flow rate, inlet air temperature, carbon monoxide content one-shot measurement elements are converted into 4-20 milli by transmitter
Pacify current signal, is sent into blower unit antisurge control system, is monitored；Wherein the measurement of inlet air temperature uses quick thermoelectricity
Even measuring cell has the advantages that measurement accuracy height, fast response time；
Step 3: the calculating and acquisition of related data are carried out,
Step 4: carrying out blower surge test, while blower anti-asthma control using adjustment static blade angle and hot-blast stove vent valve
Device output processed is set to manually, carries out 6 tests altogether, and static blade angle is separately adjusted to angularly 30 degree, 39 degree, 48 degree, 55 degree, 60 degree, 68
Degree.In test, when blower is close to stall margin, blower pressure at expulsion tabular value declines rapidly, then press manual safety operation by
Button closes stator blade and non-return flap, opens anti-asthma valve, thus obtains 6 operating points, the anti-asthma line drawn and former blower manufacturer
It is basic one using the anti-surge performance diagram (as shown in Figure 1) that adjustment static blade angle and the electronic vent valve in blower side are obtained
It causes.Acquired in DCS historical record blower pressure at expulsion in this six operating points be zero in first 2.5 seconds every 0.5 second larynx
Portion's differential pressure change rate, air-supply wind speed change rate, blast pressure change rate, air flow rate change rate, inlet air temperature change rate, an oxygen
Change carbon content change rate, amounts to 30 groups of data, and test of normality is carried out to this 30 groups of data, it is ensured that return the data in calculating
It is normal distribution.
Step 5: concluding that supply air temperature, air-supply wind speed by regressing calculation according to the 30 groups of test datas obtained
It is the significant factor that surge occurs, and obtains regression equation；
Wherein P ': throat pressure difference change rate；S': air-supply wind speed change rate；T ': supply air temperature change rate；
Step 6: introducing feed-forward control signals: as shown in Fig. 2 dotted line frame, it is by pressure at expulsion that control system is breathed heavily in place where troops were originally stationed
And anti-asthma valve is adjusted in the deviation that the setting value that anti-asthma line obtains compares, and belongs to closed loop feedback adjusting, its main feature is that
It is just adjusted after deviation occurs in controlled variable.If interference has occurred and that, without generating deviation, adjuster not will do it
Work.Therefore the adjustment effect of feedback controling mode lags behind interference effect.Inventor is by regression equationAnti-asthma control system is introduced as feedforward mathematical model
In PID regulator, become the feedforward input of adjuster, furnace side high in this way is to the interference volume of air blower after mathematical model calculates
It is introduced directly into anti-asthma control system, makes PID regulator circuit on the basis that former closed loop feedback is adjusted, feedforward is increased and adjusts
Section effect, capable of overcoming wind speed, wind-warm syndrome in advance, the two interfere significantly with the influence of factor pair blower unit, obtain smart much sooner
Quasi- regulating effect.
Step 7: the determination of feedforward barring condition, the Combining soft control strategy in anti-asthma control system, limit feedforward action and throw
Enter condition, blower is thus avoided normally to add wind, checking, change anti-asthma caused by the normal data variation of interference factor during wind
Valve events.
As an improvement of the present invention, in the step 3, since throat pressure difference signal is directly whether to reflect blower
Into the most important signal of surge, and in view of the rapidity that surge occurs, therefore more can with its every 0.5 second change rate
The operating condition variation for reflecting blower, carries out numerical analysis to throat pressure difference in antisurge control system, calculates larynx difference every 0.5
The rate of change of second: throat pressure difference delay value is obtained using computing module DEADTIME, delay time is set as 0.5 second.By larynx
Portion's differential pressure actual value subtracts 0.5 second delay value of throat pressure difference, just obtains the every 0.5 second rate of change of larynx difference；Meanwhile it utilizing
Same method counts the measurement data such as air-supply wind speed, blast pressure, air flow rate, inlet air temperature, carbon monoxide content
It is worth analytical calculation, calculates their every 0.5 second rate of changes；Adopting for historical data is carried out to the change rate of this six measuring points
Collection.
As an improvement of the present invention, in the step 7, the Combining soft control strategy in anti-asthma control system is limited
Feedforward action allows investment condition:
(1) the every 0.5 second change rate of air flow rate is greater than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is greater than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is greater than 3.5m；
(4) static blade angle is between 23 degree to 68 degree；
(5) measuring signal air-supply wind speed and supply air temperature state are all normal.
As an improvement of the present invention, in the step 7, Combining soft control strategy, when DCS system detects following shape
When state:
(1) the every 0.5 second change rate of air flow rate is less than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is less than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is less than 3.5m；
(4) static blade angle exceeds 23 degree to 68 degree；
(5) there is measurement bad point in measuring signal air-supply wind speed or supply air temperature；
(6) operator releases feedforward action manually；
The feedforward of PID controller is ineffective, and the closed loop feedback that anti-asthma control loop restores simple is adjusted.
As an improvement of the present invention, in the step 7, when
After step 1 to step 7, blower is because of the feelings that the surge that high furnace side work condition abnormality causes still can not overcome
Under condition, in original machine group anti-surge reverse current protection logic increase protection control logic, make in time blower enter safe operation or
Urgent protection is shut down, it is ensured that fan safe is supplemented as follows:
(1) the air-supply every 0.5 second change rate of wind-warm syndrome, which is greater than 60 DEG C and exports the air-supply every 0.5 second change rate of wind speed, is greater than 7m,
Two conditions reach, and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed, anti-asthma valve standard-sized sheet；
(2) on the basis of (1), if two conditions are reached and are continued for 5 seconds, blower emergency shutdown；
(3) carbon monoxide content is more than 3% and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed,
Anti-asthma valve standard-sized sheet；Herein on basis, carbon monoxide content is more than 3% and continues for 5 seconds, blower emergency shutdown；
The above relay protective scheme is equipped with throwing and moves back button, and behaviour is moved back in the throwing that operator can be protected according to actual production situation
Make.
Application Example 1: a kind of blast furnace blower anti-surge control method, the control method are as follows: with plum steel 7# drum
For blower,
Step 1: comprehensive analysis summarizes high furnace side unusual service condition, it is determined to represent high furnace side operating condition and is abnormal variation
When major parameter, from these parameters search out unusual service condition occur when on blower unit operate normally there may be influences
Most significant disturbing factor, takes adjusting control in time, and Lai Tiqian overcomes the influence of these disturbing factors.The parameter is as follows:
Carbon monoxide content before air-supply wind speed, blast pressure, air flow rate, inlet air temperature, hot-blast stove air inlet valve；
Step 2: as shown in Fig. 2, installation is sent before the end of blower unit air supply duct 25, the air inlet valve 5 of hot-blast stove 6
Five one-shot measurement elements such as wind wind speed 20, blast pressure 21, air flow rate 23, inlet air temperature 24, carbon monoxide content 24 lead to
It crosses transmitter and is converted into 4-20 milliamperes of current signals, be sent into blower unit anti-asthma control system 13, be monitored.Wherein air inlet temperature
The measurement of degree 24 uses fast thermocouple measuring cell, has the advantages that measurement accuracy height, fast response time.
Step 3: carrying out the calculating and acquisition of related data, throat pressure difference two from three signal 10 is that direct reflection blower 2 is
The no most important signal into surge reflects the operating condition variation of blower with its every 0.5 second change rate.It is controlled in anti-asthma and is
Numerical analysis is carried out to throat pressure difference two from three signal 10 in system, calculates the every 0.5 second rate of change of larynx poor 10: utilizing meter
Module DEADTIME is calculated to obtain throat pressure difference delay value, delay time is set as 0.5 second.Throat pressure difference actual value is subtracted into throat
0.5 second delay value of differential pressure just obtains the every 0.5 second rate of change of larynx difference.Meanwhile using same method to air-supply wind speed
20, the measurement data such as blast pressure 21, air flow rate 23, inlet air temperature 24, carbon monoxide content 24 carry out numerical analysis,
Calculate their every 0.5 second rate of changes.The acquisition of historical data is carried out to the change rate of this six measuring points.
Step 4: by the output of blower anti-asthma control system 13 be set to manually, using adjustment stator blade device 27 angle and
Hot-blast stove vent valve 6 carry out blower surge test, altogether carry out 6 times test, static blade angle be separately adjusted to angularly 30 degree, 39 degree, 48 degree,
55 degree, 60 degree, 68 degree.In test, when blower 2 is close to stall margin, 9 tabular value of blower pressure at expulsion declines rapidly, then presses
Manual safety runs button, closes stator blade and non-return flap, opens anti-asthma valve, thus obtains 6 operating points, the anti-asthma line drawn
The anti-surge performance diagram obtained with former blower manufacturer using adjustment static blade angle and the electronic vent valve in blower side is (as schemed
Shown in 1) it is almost the same.Blower pressure at expulsion 9 in this six operating points is acquired in 13 historical record of anti-asthma control system
Be zero in first 2.5 seconds every 0.5 second 10 change rate of throat pressure difference, air-supply 20 change rate of wind speed, 21 change rate of blast pressure, give
22 change rate of wind flow, 23 change rate of inlet air temperature, 24 change rate of carbon monoxide content amount to 30 groups of data, and to this 30 groups
Data carry out test of normality, remove abnormal point, it is ensured that the data returned in calculating are normal distributions, and data are as shown in Figure 4.
Step 5: concluding that air-supply wind speed 20, air inlet temperature by regressing calculation according to the 30 groups of test datas obtained
Degree 24 be surge occur interfere significantly with the factor, and obtain regression equation
Wherein P ': throat pressure difference change rate；S': air-supply wind speed change rate；T ': supply air temperature change rate；
Step 6: introducing feed-forward control signals: as shown in Fig. 2, control system primary structure is breathed heavily for place where troops were originally stationed in dotted line frame,
PID regulator 15 utilizes measured value 17(, that is, pressure at expulsion 9) with the setting value 17 that is calculated by anti-asthma polygronal function device 14
Anti-asthma valve 8 is adjusted in the deviation to compare, belong to closed loop feedback adjusting, only after there is deviation in controlled variable just into
Row is adjusted.Software configuration is carried out in anti-asthma control system 13, increases feedforward mathematical model 19, and input quantity obtains dry for step 5
The factor air-supply wind speed 20, inlet air temperature 24 are disturbed, output quantity is formula:
This output is introduced into the feedforward input terminal 18 of PID regulator 15, mathematical modulo is passed through to the interference volume of air blower in furnace side high in this way
Type is introduced directly into anti-asthma control system 13 after calculating, and becomes the feedforward input of adjuster 15.PID regulator 15 is anti-in former closed loop
It presents on the basis adjusted, increases feed-forward regulation effect, in the case where interference volume has occurred and that without generating deviation, and
When adjustment PID regulator output, so that anti-asthma valve is rapidly acted in time, overcoming wind speed, wind-warm syndrome in advance, the two are significant dry
The influence of factor pair blower unit is disturbed, rather than is reoperated after setting value and measured value generate deviation, is obtained much sooner
Accurately regulating effect.
Step 7: the Combining soft control strategy in anti-asthma control system 13, limits feedforward action and puts into condition, thus avoid wind
Machine normally adds wind, checking, changes anti-asthma valve events caused by the normal data variation of interference factor during wind, allows to put into
Condition are as follows:
(1) the every 0.5 second change rate of air flow rate is greater than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is greater than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is greater than 3.5m；
(4) static blade angle is between 23 degree to 68 degree；
(5) measuring signal air-supply wind speed and supply air temperature state are all normal.
When anti-asthma control system 13 detects following state:
(1) the every 0.5 second change rate of air flow rate is less than 100m3；
(2) the air-supply every 0.5 second change rate of wind-warm syndrome is less than 30 DEG C
(3) the air-supply every 0.5 second change rate of wind speed is less than 3.5m
(4) static blade angle exceeds 23 degree to 68 degree
(5) there is measurement bad point in measuring signal air-supply wind speed or supply air temperature
(6) operator releases feedforward action manually
The feedforward input 18 of PID regulator 15 is ineffective, and the closed loop feedback that anti-asthma control loop restores simple is adjusted.
Step 8: the surge that blower causes because of blower because of the surge that high furnace side work condition abnormality causes, by above-mentioned seven
A step, in the case where still can not overcoming, as shown in figure 3, on original machine group reverse current protection logical foundations in dotted line frame,
Increase protection control logic, so that blower is entered safe operation or is promptly protected in time and shut down, it is ensured that fan safe, supplement is such as
Under:
(1) the air-supply every 0.5 second change rate of wind-warm syndrome, which is greater than 60 DEG C and exports the air-supply every 0.5 second change rate of wind speed, is greater than 7m,
Two conditions reach, and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed, anti-asthma valve standard-sized sheet.
(2) on the basis of (1), if two conditions are reached and are continued for 5 seconds, blower emergency shutdown.
(3) carbon monoxide content is more than 3% and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed,
Anti-asthma valve standard-sized sheet.Herein on basis, carbon monoxide content is more than 3% and continues for 5 seconds, blower emergency shutdown.
The above relay protective scheme is equipped with throwing and moves back button, and behaviour is moved back in the throwing that operator can be protected according to actual production situation
Make.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no be used to limit the present invention
Protection scope, the equivalent substitution or substitution made based on the above technical solution belongs to protection model of the invention
It encloses.
Claims (5)
1. a kind of blast furnace blower anti-surge control method, which is characterized in that the described method comprises the following steps: Step 1: comprehensive
The high furnace side unusual service condition of analysis and summary is closed, is determined to represent major parameter when high furnace side operating condition is abnormal variation, it is described
Parameter is as follows: carbon monoxide content before air-supply wind speed, blast pressure, air flow rate, supply air temperature, hot-blast stove air inlet valve；
Step 2: before the end of blower unit air supply duct, high furnace side hot-blast stove air inlet valve, installation air-supply wind speed, air-supply pressure
Five power, air flow rate, supply air temperature, carbon monoxide content one-shot measurement elements are converted into 4-20 milliamperes of electricity by transmitter
Signal is flowed, blower unit anti-asthma control system is sent into, is monitored；
Step 3: the calculating and acquisition of related data are carried out,
Step 4: carrying out blower surge test, while blower anti-asthma controller using adjustment static blade angle and hot-blast stove vent valve
Output is set to manually, carries out 6 tests altogether, and static blade angle is separately adjusted to angularly 30 degree, 39 degree, 48 degree, 55 degree, 60 degree, 68 degree；
Step 5: concluding that supply air temperature, air-supply wind speed are asthmas by regressing calculation according to the 30 groups of test datas obtained
Shake the significant factor occurred, and obtains regression equation
Δ P '=0.47+0.11S ' -0.00286T '；
Wherein Δ P ': throat pressure difference change rate；S': air-supply wind speed change rate；T ': supply air temperature change rate
Step 6: introducing feed-forward control signals；
Step 7: the determination of feedforward barring condition, the Combining soft control strategy in anti-asthma control system, limit feedforward action and put into item
Part.
2. a kind of blast furnace blower anti-surge control method according to claim 1, which is characterized in that the step 3
In, numerical analysis is carried out to throat pressure difference in anti-asthma control system, the every 0.5 second rate of change of larynx difference is calculated: utilizing
Computing module DEADTIME obtains throat pressure difference delay value, and delay time is set as 0.5 second, throat pressure difference actual value is subtracted larynx
Differential pressure 0.5 second delay value in portion's just obtains the every 0.5 second rate of change of larynx difference；Meanwhile using same method to air-supply wind
Speed, blast pressure, air flow rate, supply air temperature, carbon monoxide content measurement data carry out numerical analysis, calculate them
Every 0.5 second rate of change；The acquisition of historical data is carried out to the change rate of this six measuring points.
3. a kind of blast furnace blower anti-surge control method according to claim 2, which is characterized in that the step 7
In, the Combining soft control strategy in anti-asthma control system, limiting feedforward action allows investment condition:
(1) the every 0.5 second change rate of air flow rate is greater than 100m3；
(2) the every 0.5 second change rate of supply air temperature is greater than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is greater than 3.5m；
(4) static blade angle is between 23 degree to 68 degree；
(5) measuring signal air-supply wind speed and supply air temperature state are all normal.
4. a kind of blast furnace blower anti-surge control method according to claim 3, which is characterized in that the step 7
In, Combining soft control strategy, when DCS system detects following state:
(1) the every 0.5 second change rate of air flow rate is less than 100m3；
(2) the every 0.5 second change rate of supply air temperature is less than 30 DEG C；
(3) the air-supply every 0.5 second change rate of wind speed is less than 3.5m；
(4) static blade angle exceeds 23 degree to 68 degree；
(5) there is measurement bad point in measuring signal air-supply wind speed or supply air temperature；
(6) operator releases feedforward action manually；
The feedforward of PID controller is ineffective, and the closed loop feedback that anti-asthma control loop restores simple is adjusted.
5. a kind of blast furnace blower anti-surge control method according to claim 4, which is characterized in that the step 7
In, when
After step 1 to step 7, blower is because of the case where surge that high furnace side work condition abnormality causes still can not overcome
Under, increase protection control logic in original machine group anti-surge reverse current protection logic, blower is made to enter safe operation or tight in time
Anxious protection is shut down, it is ensured that fan safe is supplemented as follows:
(1) the every 0.5 second change rate of supply air temperature be greater than 60 DEG C and export air-supply the every 0.5 second change rate of wind speed be greater than 7m, two
Condition reaches, and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed, anti-asthma valve standard-sized sheet；
(2) on the basis of (1), if two conditions are reached and are continued for 5 seconds, blower emergency shutdown；
(3) carbon monoxide content is more than 3% and for 3 seconds, and blower enters safe operation state, and stator blade and non-return flap are closed, prevented
Breathe heavily valve standard-sized sheet；Herein on basis, carbon monoxide content is more than 3% and continues for 5 seconds, blower emergency shutdown；
The above relay protective scheme is equipped with throwing and moves back button, and operation is moved back in the throwing that operator can be protected according to actual production situation.
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| CN110067766A (en) * | 2019-04-25 | 2019-07-30 | 石钢京诚装备技术有限公司 | Furnace axial flow blower anti-asthma adjusts safely guard method |
| CN110985429A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Control device and method for detecting and eliminating fan stall |
| CN112684694A (en) * | 2020-11-15 | 2021-04-20 | 杭州哲达科技股份有限公司 | Blast furnace blast and TRT real-time monitoring and simulation control system based on digital twin body |
| CN114837985B (en) * | 2022-05-20 | 2024-08-23 | 成都成发科能动力工程有限公司 | Anti-asthma energy efficiency control method and device for axial flow compressor |
| CN117927496B (en) * | 2024-03-13 | 2024-07-23 | 江苏海拓宾未来工业科技集团有限公司 | Flow control method and system for oil-free ultrahigh-speed centrifugal compressor |
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