CN104896166A - Electric control adjusting system of conical valve of circulating fluidized bed boiler external type heat exchanger - Google Patents
Electric control adjusting system of conical valve of circulating fluidized bed boiler external type heat exchanger Download PDFInfo
- Publication number
- CN104896166A CN104896166A CN201510277248.7A CN201510277248A CN104896166A CN 104896166 A CN104896166 A CN 104896166A CN 201510277248 A CN201510277248 A CN 201510277248A CN 104896166 A CN104896166 A CN 104896166A
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- CN
- China
- Prior art keywords
- module
- link together
- output terminal
- dead band
- mitre velve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses an electric control adjusting system of a conical valve of a circulating fluidized bed boiler external type heat exchanger. The electric control adjusting system solves the problem that the conical valve is prone to being clamped and jammed. A value setting module, a switching module, a summator module, a subtractor module, a memory generator module, a time delay module, a pulse module and a dead zone module in a distributed control system are adopted. In order to prevent the conical value from being jammed by soot particles, the position of the conical valve can not keep at the same position all the time, the control principle is that the set value of a position setting point is oscillated and changed, a proper offset value and pulse control are overlapped in the opening degree instruction of the conical valve to serve as the final valve oscillation output on the basis of the control output of an original control strategy, and at the same time, when the opening degree instruction of the conical valve and the position feedback deflection are within the dead zone range, the control system does not carry out pulse oscillation output, the existing opening degree is kept, and frequent oscillation of the conical valve is avoided. The electric control adjusting system is especially suitable for being used on site.
Description
Technical field
The present invention relates to a kind of automatically controlled regulating system of valve, the automatically controlled regulating system of the mitre velve particularly in a kind of External Heat Exchanger in CFB Boiler.
Background technique
Circulating fluidized bed combustion, as the important representative of clean coal technology, can realize the direct desulfurization in stove combustion process, effectively can suppress the discharge of nitrogen oxide, and the adaptability for coal is very strong, obtains and applies widely.That circulating fluidized bed boiler is divided into band external heat exchanger and not with external heat exchanger two kinds.For the recirculating fluidized bed of band external heat exchanger, through the material that cyclone separator separates, a part directly returns burner hearth through material returning device, and another part then will after the external heat exchanger (external bed) being arranged in burner hearth both sides, then returns burner hearth and carry out secondary combustion.Superheater and reheater heating surface is furnished with in the external bed of such circulating fluidized bed boiler, Main Function absorbs the waste heat in grey loop, balance heat distribution, reduce the circulating ash temperature returning burner hearth, and then reduction bed temperature, make the bed temperature of recirculating fluidized bed be maintained at the optimum state of low emission high burning efficiency.Feed back mitre velve is provided with between separator and external bed, this feed back mitre velve is the necessary channel that the isolated material of cyclone separator enters into external bed, by the aperture of regulable control feed back mitre velve, the ratio regulating external bed and firing chamber recirculation ash material can be reached, realize the adjustment of boiler bed gentle reheating outlet port steam temperature.When stable operation of unit, the valve opening of mitre velve remains unchanged substantially, if but the valve of mitre velve stop for a long time in a certain aperture, due to the accumulation that circulating ash material is long-term, the phenomenon that can cause valve generation bite or block; If the frequent valve opening regulating this mitre velve, the furnace temperature of circulating fluidized bed boiler can be caused again unstable, make bed temperature cannot maintain the preferable states of low emission height burning.
Summary of the invention
The invention provides the automatically controlled regulating system of a kind of External Heat Exchanger in CFB Boiler mitre velve, solve the problem that mitre velve bite easily occurs and blocks, namely ensure that valve can not stop for a long time in a certain aperture, the technical problem of the unit operation instability avoiding again the frequent vibration due to mitre velve to cause.
The present invention solves above technical problem by the following technical programs:
The automatically controlled regulating system of a kind of External Heat Exchanger in CFB Boiler mitre velve, comprises mitre velve valve opening position transducer, setting value module, handover module, adder Module, subtracter block, memory generator module, time delay module, pulse module, dead band module, the output terminal of mitre velve valve opening position transducer and the first input end of subtracter block link together, second input end of the automatically controlled baffle plate input instruction signal of mitre velve and subtracter block links together, the output terminal of subtracter block and the input end of dead band module link together, the output terminal of dead band module inputs set end S with first of memory generator module and links together, the memory output terminal of generator module and the input end of time delay module link together, the output terminal of time delay module and the input end of pulse module link together, the output terminal of pulse module inputs reset terminal R with second of memory generator module and links together, the output terminal of setting value module and the first input end of adder Module link together, second input end of the automatically controlled baffle plate input instruction signal of mitre velve and adder Module links together, the output terminal of adder Module and the first input end of handover module link together, second input end of the automatically controlled baffle plate input instruction signal of mitre velve and handover module links together, the memory output terminal of generator module and the switch terminal of handover module link together, output terminal and the mitre velve valve opening ECU (Electrical Control Unit) of handover module link together.
Dead band module to be dead band definite value be 2% dead band module, when dead band is greater than 2%, it is 1 that dead band module exports; When dead band is less than 2%, it is 0 that dead band module exports; Setting value module to be setting value be 3% setting value module.
Present invention, avoiding the phenomenon that the large circulating fluidized bed boiler mitre velve generation bite that is configured with external bed blocks, avoid the problem of the unit operation instability that the frequent vibration due to mitre velve causes simultaneously.Blocked by soot particle to prevent mitre velve, valve location can not remain at same position, its control principle is the settings of position set point is change in oscillation, mitre velve opening degree instruction controls on the basis of output at original control strategy, superpose and export as the vibration of final valve into suitable Offset and Pulse Width Control, simultaneously for avoiding the frequent vibration of mitre velve, when mitre velve opening degree instruction and position feedback deviation are in dead zone range, control system does not carry out impulse hunting output, keeps existing aperture.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the characteristic Schedule of the present invention's module used.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
The automatically controlled regulating system of a kind of External Heat Exchanger in CFB Boiler mitre velve, comprises mitre velve valve opening position transducer M9, setting value module M6, handover module M8, adder Module M7, subtracter block M1, memory generator module M3, time delay module M4, pulse module M5, dead band module M2; The output terminal of mitre velve valve opening position transducer M9 and the first input end i of subtracter block M1
1link together, the second input end i of mitre velve automatically controlled baffle plate input instruction signal P and subtracter block M1
2link together, the output terminal O of subtracter block M1
1with the input end i of dead band module M2
3link together, the output terminal O of dead band module M2
2input set end S with first of memory generator module M3 to link together, the output terminal O of memory generator module M3
3with the input end i of time delay module M4
4link together, the output terminal O of time delay module M4
4with the input end i of pulse module M5
5link together, the output terminal O of pulse module M5
5input reset terminal R with second of memory generator module M3 to link together, the output terminal O of setting value module M6
6with the first input end i of adder Module M7
6link together, the second input end i of mitre velve automatically controlled baffle plate input instruction signal P and adder Module M7
7link together, the output terminal O of adder Module M7
7with the first input end i of handover module M8
8link together, the second input end i of mitre velve automatically controlled baffle plate input instruction signal P and handover module M8
9link together, the output terminal O of memory generator module M3
3with the switch terminal S of handover module M8
1link together, the output terminal O of handover module M8
8link together with mitre velve valve opening ECU (Electrical Control Unit).
Dead band module M2 to be dead band definite value be 2% dead band module, when dead band is greater than 2%, it is 1 that dead band module exports; When dead band is less than 2%, it is 0 that dead band module exports; Setting value module M6 to be setting value be 3% setting value module.
The output signal of mitre velve valve opening position transducer M9 and mitre velve automatically controlled baffle plate input instruction signal P introduce subtracter block M1 and carry out mathematic interpolation, and introduce dead band module M2, when difference is less than dead band definite value 2%, can think that mitre velve valve event is sensitive, there is not bite, at this moment do not carry out impulse hunting output.
When the output signal of mitre velve valve opening position transducer M9 and the difference of mitre velve automatically controlled baffle plate input instruction signal P are greater than dead band definite value 2%, mitre velve generation bite phenomenon can be judged, now by memory generator module M3 set, carry out impulse hunting, duration of oscillation is determined by time delay module M4 and pulse module M5, time cycle is 20 seconds, after duration of oscillation terminates, memory generator module M3 is resetted, the superposition amount that impulse hunting exports is arranged by setting value module M6, setting value equals 3%, introduce adder Module M7 and mitre velve instruction output signal is superposed to the new instruction output signal being used as impulse hunting, the impulse hunting of one-period is realized by the switch terminal of handover module M8.
After the mitre velve impulse hunting of one-period terminates, if when the deviation of the output signal of mitre velve automatically controlled baffle plate input instruction signal P and mitre velve valve opening position transducer M9 is in dead zone range, mitre velve valve opening ECU (Electrical Control Unit) does not carry out impulse hunting output, keep existing aperture, avoid the frequent vibration of mitre velve; If when the deviation of the output signal of mitre velve automatically controlled baffle plate input instruction signal P and mitre velve valve opening position transducer M9 is outside dead zone range, automatically controlled regulating system then proceeds impulse hunting.
The present invention adopts setting value module, handover module, adder Module, subtracter block, memory generator module, time delay module, pulse module, dead band module in Distributed Control System.Blocked by soot particle to prevent mitre velve, mitre velve valve location can not remain at same position, its control principle is the settings of position set point is change in oscillation, mitre velve opening degree instruction controls on the basis of output at original control strategy, superpose and export as the vibration of final valve into suitable Offset and Pulse Width Control, simultaneously when mitre velve opening degree instruction and position feedback deviation are in dead zone range, control system does not carry out impulse hunting output, keep existing aperture, avoid the frequent vibration of mitre velve.
Claims (2)
1. the automatically controlled regulating system of External Heat Exchanger in CFB Boiler mitre velve, comprises mitre velve valve opening position transducer (M9), setting value module (M6), handover module (M8), adder Module (M7), subtracter block (M1), memory generator module (M3), time delay module (M4), pulse module (M5), dead band module (M2); It is characterized in that, the output terminal of mitre velve valve opening position transducer (M9) and the first input end (i of subtracter block (M1)
1) link together, the second input end (i of the automatically controlled baffle plate input instruction signal (P) of mitre velve and subtracter block (M1)
2) link together, the output terminal (O of subtracter block (M1)
1) with the input end (i of dead band module (M2)
3) link together, the output terminal (O of dead band module (M2)
2) input set end (S) link together with first of memory generator module (M3), remember the output terminal (O of generator module (M3)
3) with the input end (i of time delay module (M4)
4) link together, the output terminal (O of time delay module (M4)
4) with the input end (i of pulse module (M5)
5) link together, the output terminal (O of pulse module (M5)
5) input reset terminal (R) and link together with second of memory generator module (M3), the output terminal (O of setting value module (M6)
6) with the first input end (i of adder Module (M7)
6) link together, the second input end (i of the automatically controlled baffle plate input instruction signal (P) of mitre velve and adder Module (M7)
7) link together, the output terminal (O of adder Module (M7)
7) with the first input end (i of handover module (M8)
8) link together, the second input end (i of the automatically controlled baffle plate input instruction signal (P) of mitre velve and handover module (M8)
9) link together, the output terminal (O of memory generator module (M3)
3) with the switch terminal (S of handover module (M8)
1) link together, the output terminal (O of handover module (M8)
8) link together with mitre velve valve opening ECU (Electrical Control Unit).
2. the automatically controlled regulating system of a kind of External Heat Exchanger in CFB Boiler mitre velve according to claim 1, it is characterized in that, dead band module (M2) to be dead band definite value be 2% dead band module, when dead band is greater than 2%, it is 1 that dead band module exports, when dead band is less than 2%, it is 0 that dead band module exports; Setting value module (M6) to be setting value be 3% setting value module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277248.7A CN104896166A (en) | 2015-05-27 | 2015-05-27 | Electric control adjusting system of conical valve of circulating fluidized bed boiler external type heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277248.7A CN104896166A (en) | 2015-05-27 | 2015-05-27 | Electric control adjusting system of conical valve of circulating fluidized bed boiler external type heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104896166A true CN104896166A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510277248.7A Pending CN104896166A (en) | 2015-05-27 | 2015-05-27 | Electric control adjusting system of conical valve of circulating fluidized bed boiler external type heat exchanger |
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| CN (1) | CN104896166A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856398A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Primary air control device of double-bed circulating fluidized bed boiler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5784975A (en) * | 1996-12-23 | 1998-07-28 | Combustion Engineering, Inc. | Control scheme for large circulating fluid bed steam generators (CFB) |
| CN103216828A (en) * | 2013-05-13 | 2013-07-24 | 北京和隆优化科技股份有限公司 | Material returning fault self-healing control system for circulating fluidized bed boiler |
| CN104266164A (en) * | 2014-07-15 | 2015-01-07 | 神华集团有限责任公司 | Supercritical CFB (Circulating Fluidized Bed) boiler reheating steam temperature adjusting system and adjusting method |
| CN204717093U (en) * | 2015-05-27 | 2015-10-21 | 国网山西省电力公司电力科学研究院 | The automatically controlled regulating system of External Heat Exchanger in CFB Boiler mitre velve |
-
2015
- 2015-05-27 CN CN201510277248.7A patent/CN104896166A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5784975A (en) * | 1996-12-23 | 1998-07-28 | Combustion Engineering, Inc. | Control scheme for large circulating fluid bed steam generators (CFB) |
| CN103216828A (en) * | 2013-05-13 | 2013-07-24 | 北京和隆优化科技股份有限公司 | Material returning fault self-healing control system for circulating fluidized bed boiler |
| CN104266164A (en) * | 2014-07-15 | 2015-01-07 | 神华集团有限责任公司 | Supercritical CFB (Circulating Fluidized Bed) boiler reheating steam temperature adjusting system and adjusting method |
| CN204717093U (en) * | 2015-05-27 | 2015-10-21 | 国网山西省电力公司电力科学研究院 | The automatically controlled regulating system of External Heat Exchanger in CFB Boiler mitre velve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856398A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Primary air control device of double-bed circulating fluidized bed boiler |
| CN112856398B (en) * | 2021-01-04 | 2023-08-04 | 神华神东电力有限责任公司 | Primary air control device of double-bed circulating fluidized bed boiler |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20150909 |