CN107631286A - A kind of method for regulating temperature and system for improving ultra-supercritical boiler unit efficiency - Google Patents
A kind of method for regulating temperature and system for improving ultra-supercritical boiler unit efficiency Download PDFInfo
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- CN107631286A CN107631286A CN201710917961.2A CN201710917961A CN107631286A CN 107631286 A CN107631286 A CN 107631286A CN 201710917961 A CN201710917961 A CN 201710917961A CN 107631286 A CN107631286 A CN 107631286A
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Abstract
The present invention proposes a kind of method for regulating temperature and system for improving ultra-supercritical boiler unit efficiency.This method sets a control system respectively in the tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, feedwater flow of boiler, and the control system is all connected with station boiler remote diagnosis analysis system；Superheater and reheater all in accordance with predetermined temperature and pressure, according to station boiler remote diagnosis analysis system, analyze the demand of each index, and pass through control system, joint is synchronously adjusted in real time respectively using a variety of regulative modes such as tilting burner and desuperheating waters to each temperature regulation mechanism.
Description
Technical field
The present invention relates to a kind of method for regulating temperature and system for improving ultra-supercritical boiler unit efficiency.
Background technology
For the temperature adjustment means that ultra-supercritical boiler is present, burner pivot angle, spray desuperheating device, guard rails,
Excess air coefficient, reheater emergency spray desuperheat, adjustment means single can only be adjusted, and regulating effect is bright during high load capacity
It is aobvious, but these adjustment means lag, react insensitive in low- load conditions, unit efficiency reduction, denitration inlet flue gas temperature be present
Less than alarming value, the problems such as hydrodynamic force security is unstable, wall temperature of heated surface allowance reduces, and traditional temperature adjustment means all use
Unitary variant is adjusted.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of method for regulating temperature for improving ultra-supercritical boiler unit efficiency and is
System, coupled by the way that a variety of method of temperature control are optimized, ensure during underrun temperature adjustment speed faster, reaction it is sensitiveer.
A kind of method for regulating temperature for improving ultra-supercritical boiler unit efficiency, including：
Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater attemperator point in boiler
Not She Zhi a control system, the control system is all connected with station boiler remote diagnosis analysis system；
Superheater output target temperature and pressure are preset in the control system, according to station boiler remote diagnosis
Database in analysis system, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；
The control instruction that superheater is sent according to control system, using 605 DEG C of specified boiler capacitys as final goal, pass through
Station boiler remote diagnosis analysis system analyzes Coal-fired capacity, desuperheating water of superheater dynamic change trend, determine Coal-fired capacity and to
Water flow data, adjust feeder and superheater desuperheater spray amount；
Based on reheater presets output target temperature and the pressure of boiler, pass through station boiler remote diagnosis system
Database analysis in system goes out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, mistake
The variational trend parameter of air coefficient is measured, and is adjusted in real time；
In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches rated value,
It is determined that coupling mediation practices and control logic implement system.
In described method, the control system can be adjusted independently simultaneously.
In described method, the database in station boiler remote diagnosis analysis system calculates burner pivot angle and moved
State variational trend parameter, tail flue gas baffle plate dynamic change trend parameter, the variational trend parameter of excess air coefficient, and carry out
Regulation in real time, it is specially：When reheater burner temperature exceedes output target temperature, analyzed according to station boiler remote diagnosis
Burner pivot angle, tail flue gas baffle plate in system, the variation tendency of excess air coefficient provide command adapted thereto, allow control system
Regulation is synchronized respectively：Control system controls the tilting burner bottom, the cigarette of regulation tail flue gas baffle plate increase reheater side
Tolerance, increase excess air coefficient；When reheater burner temperature is less than output target temperature, then inverse process is performed.
In described method, the excess air coefficient is the smoke components content detected according to tail flue gas analyzer
Dynamic change trend parameter, calculate excess air coefficient.
In described method, described superheater output target temperature and pressure, the output target temperature of boiler and pressure,
Desuperheating water of superheater variation tendency is the numerical value of any time point under boiler steady load.
A kind of thermoregulating system for improving ultra-supercritical boiler unit efficiency, including：
Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater attemperator point in boiler
She Zhi not a control system, i.e. tilting burner control system, tail flue gas stop control system, excess air coefficient control
System, coal-fired amount control system and superheater attemperator control system, each control system are all connected with station boiler and remotely examined
Disconnected analysis system；
Superheater output target temperature and pressure are preset in the control system, according to station boiler remote diagnosis
Database in analysis system, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；
The control instruction that superheater is sent according to control system, using 605 DEG C of specified boiler capacitys as final goal, pass through
Station boiler remote diagnosis analysis system analyzes Coal-fired capacity, desuperheating water of superheater dynamic change trend, determine Coal-fired capacity and to
Water flow data, adjust feeder and superheater desuperheater spray amount；
Based on reheater presets output target temperature and the pressure of boiler, pass through station boiler remote diagnosis system
Database analysis in system goes out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, mistake
The variational trend parameter of air coefficient is measured, and is adjusted in real time；
In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches rated value,
It is determined that coupling mediation practices and control logic implement system.
In described system, the control system can be adjusted independently simultaneously.
In described system, the database in station boiler remote diagnosis analysis system calculates burner pivot angle and moved
State variational trend parameter, tail flue gas baffle plate dynamic change trend parameter, the variational trend parameter of excess air coefficient, and carry out
Regulation in real time, it is specially：When reheater burner temperature exceedes output target temperature, analyzed according to station boiler remote diagnosis
Burner pivot angle, tail flue gas baffle plate in system, the variation tendency of excess air coefficient provide command adapted thereto, allow control system
Regulation is synchronized respectively：Control system controls the tilting burner bottom, the cigarette of regulation tail flue gas baffle plate increase reheater side
Tolerance, increase excess air coefficient；When reheater burner temperature is less than output target temperature, then inverse process is performed.
In described system, the excess air coefficient is the smoke components content detected according to tail flue gas analyzer
Dynamic change trend parameter, calculate excess air coefficient.
In described system, described superheater output target temperature and pressure, the output target temperature of boiler and pressure,
Desuperheating water of superheater variation tendency is the numerical value of any time point under boiler steady load.
By setting control system, and by control system and station boiler remote diagnosis analysis system, the real-time number of power plant
According to docking, boiler operatiopn date comprision, trend analysis, analysis on change are realized, realizes that a variety of method of temperature control are adjusted jointly
Section, control efficiency is improved, reduce attemperation water flow.Temperature adjustment means response lag under traditional underload, using this regulating measure,
Governing speed can be accelerated, and method of temperature control is now changed to smooth type method of temperature control, temperature adjustment speed by original single stepwise adjustment
Degree is faster.The Proper Match of carbonated drink parameter and effectively regulation, to realize that index of the unit in wide load range is advanced superior,
Demonstration and popularizing action can be played.In variable working condition, the efficient wide various temperature adjustment schemes of rate of load condensate ultra supercritical coal-burning boiler
Service data under temperature adjustment response speed, temperature adjustment amplitude and various combination mode.Pass through software and boiler inline diagnosis data
Storehouse, temperature adjustment speed is faster.
The present invention to part running on the lower load tilting burner, coal-water ratio, flue gas by adjusting plate washer and excess air system
The optimization coupling of a variety of method of temperature control such as number is adjusted to the steam temperature under wide load range, ensures flameholding, is improved ultralow negative
Under lotus the problems such as gas temperature windage, water-cooling wall security, wall temperature of heated surface allowance, ensure that working medium side temperature can reach, to predetermined vapour
Temperature control system optimizes, and considers comprehensive feedforward and VARIABLE PARAMETER PID CONTROL, make control system unit different load section all
Preferable control effect can be reached.The high/low and rate limit of frequency difference is provided, prevents the ripple of boiler input demand for control instruction
It is dynamic, realize that boiler runs the boiler efficiency for still keeping of a relatively high and relatively low NOx emission in wide load range, to ensureing
Boiler plays an important role in the operational factor and unit operation reliability of running on the lower load.
Brief description of the drawings
, below will be to embodiment or prior art in order to illustrate more clearly of technical scheme of the invention or of the prior art
The required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are only in the present invention
Some embodiments recorded, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of method for regulating temperature embodiment flow chart for improving ultra-supercritical boiler unit efficiency of the present invention；
Fig. 2 is a kind of thermoregulating system structural representation for improving ultra-supercritical boiler unit efficiency of the present invention.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make the present invention's
Above-mentioned purpose, feature and advantage can be more obvious understandable, technical scheme in the present invention made below in conjunction with the accompanying drawings further detailed
Thin explanation.
The present invention proposes a kind of method for regulating temperature and system for improving ultra-supercritical boiler unit efficiency, by by a variety of tune
The coupling of warm method optimizing, ensure during underrun temperature adjustment speed faster, reaction it is sensitiveer.
A kind of method for regulating temperature for improving ultra-supercritical boiler unit efficiency, as shown in figure 1, including：
S101：Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater in boiler subtract
Warm device sets a control system respectively, and the control system is all connected with station boiler remote diagnosis analysis system；
S102：Superheater output target temperature and pressure is preset in the control system, such as 600MW is super faces
Boundary's boiler, it is desirable to 605 DEG C of superheater outlet pressure 31MPa, temperature, according to the data in station boiler remote diagnosis analysis system
Storehouse, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；
The control instruction that superheater is sent according to control system, with 605 DEG C of specified boiler capacity (feedwater flows+overheat
Device injection flow rate) it is final goal, Coal-fired capacity, desuperheating water of superheater dynamic are analyzed by station boiler remote diagnosis analysis system
Variation tendency, Coal-fired capacity and feedwater flow data are determined, adjust feeder and superheater desuperheater spray amount；The Coal-fired capacity and
Desuperheating water of superheater is individually adjusted in synchronism, and forms a variety of temperature adjustment couplings；
Such as：When superheater outlet temperature exceedes output target temperature, provided according to station boiler remote diagnosis system
Instruction, allows control system to synchronize regulation respectively, appropriate to increase superheater desuperheater spray, reduce Coal-fired capacity, finds optimal
Superheater regulative mode；
S103：It is long-range by station boiler based on reheater presets output target temperature and the pressure of boiler
Database analysis in diagnostic system goes out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend ginseng
Number, the variational trend parameter of excess air coefficient, and adjusted in real time；
S104：In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches volume
Definite value, it is determined that coupling mediation practices and control logic implement system.
In described method, the control system can be adjusted independently simultaneously.
In described method, the database analysis in station boiler remote diagnosis analysis system goes out burner pivot angle and moved
State variational trend parameter, tail flue gas baffle plate dynamic change trend parameter, the variational trend parameter of excess air coefficient, and carry out
Regulation in real time, it is specially：When reheater burner temperature exceedes output target temperature, analyzed according to station boiler remote diagnosis
Burner pivot angle, tail flue gas baffle plate in system, the variation tendency of excess air coefficient provide command adapted thereto, allow control system
Regulation is synchronized respectively：Control system controls the tilting burner bottom, the cigarette of regulation tail flue gas baffle plate increase reheater side
Tolerance, suitably increase excess air coefficient；When reheater burner temperature is less than output target temperature, then opposite mistake is performed
Journey.
Wherein increasing excess air coefficient should in the reasonable scope, i.e., in high load capacity, excess air coefficient maximum can not
Less than 1.7 are can be controlled in more than 1.3, during underload.Three kinds of method of temperature control are adjusted in synchronism, and find optimal method of temperature control, so as to
Form a variety of method of temperature control couplings.When now reheater outlet temperature remains above output target temperature, with reheater desuperheating water thing
Therefore water spray is auxiliary, guarantees to reach desired value.
In described method, the excess air coefficient is the smoke components content detected according to tail flue gas analyzer
Dynamic change trend parameter, calculate excess air coefficient.Main monitoring CO and O2 content, judges fuel combustion situation, calculates
Excess air coefficient, to ensure fuel completely burned, burner hearth full combustion of fuel is always ensured that, and ensure excess air coefficient not
Cause excessive.
In described method, described superheater output target temperature and pressure, the output target temperature of boiler and pressure,
Desuperheating water of superheater variation tendency is the numerical value of any time point under boiler steady load.
A kind of thermoregulating system for improving ultra-supercritical boiler unit efficiency, as shown in Fig. 2 including：
Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater attemperator point in boiler
She Zhi not a control system, i.e. tilting burner control system 201, tail flue gas stop control system 202, excess air system
Number control system 203, coal-fired amount control system 204 and superheater attemperator control system 205, each control system are all connected with
Station boiler remote diagnosis analysis system 206；
Superheater output target temperature and pressure are preset in the control system, according to station boiler remote diagnosis
Database in analysis system, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；
The control instruction that superheater is sent according to control system, using 605 DEG C of specified boiler capacitys as final goal, pass through
Station boiler remote diagnosis analysis system analyzes Coal-fired capacity, desuperheating water of superheater dynamic change trend, determine Coal-fired capacity and to
Water flow data, adjust feeder and superheater desuperheater spray amount；
Based on reheater presets output target temperature and the pressure of boiler, pass through station boiler remote diagnosis system
Database analysis in system goes out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, mistake
The variational trend parameter of air coefficient is measured, and is adjusted in real time；
In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches rated value,
It is determined that coupling mediation practices and control logic implement system.
In described system, the control system can be adjusted independently simultaneously.
In described system, the database in station boiler remote diagnosis analysis system calculates burner pivot angle and moved
State variational trend parameter, tail flue gas baffle plate dynamic change trend parameter, the variational trend parameter of excess air coefficient, and carry out
Regulation in real time, it is specially：When reheater burner temperature exceedes output target temperature, analyzed according to station boiler remote diagnosis
Burner pivot angle, tail flue gas baffle plate in system, the variation tendency of excess air coefficient provide command adapted thereto, allow control system
Regulation is synchronized respectively：Control system controls the tilting burner bottom, the cigarette of regulation tail flue gas baffle plate increase reheater side
Tolerance, increase excess air coefficient；When reheater burner temperature is less than output target temperature, then inverse process is performed.
In described system, the excess air coefficient is the smoke components content detected according to tail flue gas analyzer
Dynamic change trend parameter, calculate excess air coefficient.
In described system, described superheater output target temperature and pressure, the output target temperature of boiler and pressure,
Desuperheating water of superheater variation tendency is the numerical value of any time point under boiler steady load.
By setting control system, and by control system and station boiler remote diagnosis analysis system, the real-time number of power plant
According to docking, boiler operatiopn date comprision, trend analysis, analysis on change are realized, realizes that a variety of method of temperature control are adjusted jointly
Section, control efficiency is improved, reduce attemperation water flow.Temperature adjustment means response lag under traditional underload, using this regulating measure,
Governing speed can be accelerated, and method of temperature control is now changed to smooth type method of temperature control, temperature adjustment speed by original single stepwise adjustment
Degree is faster.The Proper Match of carbonated drink parameter and effectively regulation, to realize that index of the unit in wide load range is advanced superior,
Demonstration and popularizing action can be played.In variable working condition, the efficient wide various temperature adjustment schemes of rate of load condensate ultra supercritical coal-burning boiler
Service data under temperature adjustment response speed, temperature adjustment amplitude and various combination mode.Pass through software and boiler inline diagnosis data
Storehouse, temperature adjustment speed is faster.
The present invention to part running on the lower load tilting burner, coal-water ratio, flue gas by adjusting plate washer and excess air system
The optimization coupling of a variety of method of temperature control such as number is adjusted to the steam temperature under wide load range, ensures flameholding, is improved ultralow negative
Under lotus the problems such as gas temperature windage, water-cooling wall security, wall temperature of heated surface allowance, ensure that working medium side temperature can reach, to predetermined vapour
Temperature control system optimizes, and considers comprehensive feedforward and VARIABLE PARAMETER PID CONTROL, make control system unit different load section all
Preferable control effect can be reached.The high/low and rate limit of frequency difference is provided, prevents the ripple of boiler input demand for control instruction
It is dynamic, realize that boiler runs the boiler efficiency for still keeping of a relatively high and relatively low NOx emission in wide load range, to ensureing
Boiler plays an important role in the operational factor and unit operation reliability of running on the lower load.
Although depicting the present invention by embodiment, it will be appreciated by the skilled addressee that the present invention have it is many deformation and
Change the spirit without departing from the present invention, it is desirable to which appended claim includes these deformations and changed without departing from the present invention's
Spirit.
Claims (10)
- A kind of 1. method for regulating temperature for improving ultra-supercritical boiler unit efficiency, it is characterised in that including：Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater attemperator in boiler are set respectively A control system is put, the control system is all connected with station boiler remote diagnosis analysis system；Superheater output target temperature and pressure are preset in the control system, is analyzed according to station boiler remote diagnosis Database in system, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；The control instruction that superheater is sent according to control system, using 605 DEG C of specified boiler capacitys as final goal, pass through power station Boiler remote diagnosis analysis system analyzes Coal-fired capacity, desuperheating water of superheater dynamic change trend, determines Coal-fired capacity and to current Data are measured, adjust feeder and superheater desuperheater spray amount；Based on reheater presets output target temperature and the pressure of boiler, by station boiler remote diagnosis system Database analysis go out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, excessive empty The variational trend parameter of gas coefficient, and adjusted in real time by control system；In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches rated value, it is determined that Couple mediation practices and control logic implements system.
- 2. the method as described in claim 1, it is characterised in that the control system can be adjusted independently simultaneously.
- 3. the method as described in claim 1, it is characterised in that pass through the database in station boiler remote diagnosis analysis system Calculate burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, excess air coefficient Variational trend parameter, and adjusted in real time by control system, it is specially：When reheater burner temperature exceedes output target During temperature, burner pivot angle, tail flue gas baffle plate, excess air coefficient in station boiler remote diagnosis analysis system Variation tendency provides command adapted thereto, allows control system to synchronize regulation respectively：Control system controls the tilting burner bottom, adjusts The exhaust gas volumn of tail flue gas baffle plate increase reheater side is saved, increases excess air coefficient；When reheater burner temperature is less than defeated When going out target temperature, then inverse process is performed.
- 4. the method as described in claim 1, it is characterised in that the excess air coefficient is, according to tail flue gas analyzer The smoke components content dynamic change trend parameter of detection, calculate excess air coefficient.
- 5. the method as described in claim 1, it is characterised in that described superheater output target temperature and pressure, boiler Output target temperature and pressure, desuperheating water of superheater variation tendency are the numerical value of any time point under boiler steady load.
- A kind of 6. thermoregulating system for improving ultra-supercritical boiler unit efficiency, it is characterised in that including：Tilting burner, tail flue gas baffle plate and tail flue gas analyzer, feeder, superheater attemperator in boiler are set respectively Put a control system, i.e. tilting burner control system, tail flue gas stop control system, excess air coefficient control system System, coal-fired amount control system and superheater attemperator control system, each control system are all connected with station boiler remote diagnosis Analysis system；Superheater output target temperature and pressure are preset in the control system, is analyzed according to station boiler remote diagnosis Database in system, analyzes the dynamic need amount of Coal-fired capacity and feedwater flow, and sends corresponding control instruction；The control instruction that superheater is sent according to control system, using 605 DEG C of specified boiler capacitys as final goal, pass through power station Boiler remote diagnosis analysis system analyzes Coal-fired capacity, desuperheating water of superheater dynamic change trend, determines Coal-fired capacity and to current Data are measured, adjust feeder and superheater desuperheater spray amount；Based on reheater presets output target temperature and the pressure of boiler, by station boiler remote diagnosis system Database analysis go out burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, excessive empty The variational trend parameter of gas coefficient, and adjusted in real time by control system；In the case of underload, excess air coefficient is kept to maintain within the specified range, reheater steam temperature reaches rated value, it is determined that Couple mediation practices and control logic implements system.
- 7. system as claimed in claim 6, it is characterised in that the control system can be adjusted independently simultaneously.
- 8. system as claimed in claim 6, it is characterised in that pass through the database in station boiler remote diagnosis analysis system Calculate burner pivot angle dynamic change trend parameter, tail flue gas baffle plate dynamic change trend parameter, excess air coefficient Variational trend parameter, and adjusted in real time by control system, it is specially：When reheater burner temperature exceedes output target During temperature, burner pivot angle, tail flue gas baffle plate, excess air coefficient in station boiler remote diagnosis analysis system Variation tendency provides command adapted thereto, allows control system to synchronize regulation respectively：Control system controls the tilting burner bottom, adjusts The exhaust gas volumn of tail flue gas baffle plate increase reheater side is saved, increases excess air coefficient；When reheater burner temperature is less than defeated When going out target temperature, then inverse process is performed.
- 9. system as claimed in claim 6, it is characterised in that the excess air coefficient is, according to tail flue gas analyzer The smoke components content dynamic change trend parameter of detection, calculate excess air coefficient.
- 10. system as claimed in claim 6, it is characterised in that described superheater output target temperature and pressure, boiler Output target temperature and pressure, desuperheating water of superheater variation tendency are the numerical value of any time point under boiler steady load.
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| CN112639772A (en) * | 2020-03-04 | 2021-04-09 | 交通运输部天津水运工程科学研究所 | Wave force stress calculation method and system for underwater submergence |
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| CN107631286B (en) | 2019-04-19 |
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