CN103343961B - Dynamic compensation method of attemperation water impact leading steam temperature measuring point in boiler steam temperature control system - Google Patents
Dynamic compensation method of attemperation water impact leading steam temperature measuring point in boiler steam temperature control system Download PDFInfo
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Abstract
Provided is a dynamic compensation method of an attemperation water impact leading steam temperature measuring point in a boiler steam temperature control system. According to the method, an attemperation water impact leading steam temperature measuring point correction factor on-line computation module is arranged in the overheating and reheating steam temperature cascade control system of a power station boiler, the correction factor of the attemperation water impact leading steam temperature measuring point is computed on line through the module, the difference between a steam temperature set value and a controlled steam temperature feedback value is divided by the correction factor to compensate changing of inertia zone object gain, output of an auxiliary adjuster is multiplied by the correction factor to compensate changing of leading zone object gain, and accordingly dynamic compensation of the attemperation water impact leading steam temperature measuring point is achieved. The method achieves dynamic compensation of the attemperation water impact leading steam temperature measuring point in the steam temperature control system and has the advantages of being good in compensation effect, field conduction is convenient, control effect is good, control quality of the overheating and reheating steam temperature cascade control system of the power station boiler can be guaranteed, and safety and economy of operation of the power station boiler are improved.
Description
Technical field
The present invention relates to and a kind ofly effectively can prevent when desuperheating water impacts leading steam temperature measuring point that station boiler is overheated, dynamic compensation method that reheat steam temperature cascade control system Control platform declines, belong to boiler technology field.
Background technology
Overheated in station boiler, reheat steam temperature is the major parameter affecting boiler operatiopn security, economy.Large-sized boiler one-level, secondary superheater steam temperature adopt spray desuperheating regulative mode; It is auxiliary regulative mode that reheat steam temperature adopts based on gas baffle or tilting burner, spray desuperheating.Because controlled device has Great inertia, large delay, many unfavorable characteristics such as non-linear, steam temperature is caused to be difficult to control.Due to electrical network power load randomness increase, wind-powered electricity generation is grid-connected in a large number causes the reasons such as generation load randomness increase, dispatching of power netwoks needs the generation load adjusting fired power generating unit more continually, and to maintain the equilibrium of supply and demand, this makes boiler combustion disturbance greatly increase.Meanwhile, because fuel performance is unstable, boiler needs constantly to adjust air distribution mode to reduce NO after implementing burning optimization
xthe reasons such as discharge, also cause boiler frequently to adjust fired state to eliminate various disturbance.Fired state change makes fired power generating unit be in variable parameter operation state more, and overheated, reheat steam temperature is difficult to control more.
Overheated, reheat steam temperature many employings tandem or leading differential control system, be characterized in: install leading steam temperature measuring point before overheated after spray desuperheating device, reheater entrance, install controlled steam temperature measuring point in overheated, reheater exit.Secondary controller exports and is called leading district object to the transfer function of leading steam temperature; The transfer function of leading steam temperature to controlled steam temperature is called inertia district object.Desuperheating water sprays into the feature of rear controlled steam temperature variation tendency to utilize leading steam temperature to reflect fast, eliminate the unfavorable factors such as attemperation water flow disturbance, steam flow disturbance, executing agency be non-linear by a fast control loop, effectively improve the Control platform of steam temperature.Illustrate for serials control, as shown in Figure 1, system comprises inside and outside two loops to Control system architecture, and the controller of inner looping is called secondary controller, and controlled device is leading district object; External loop controller is called master selector, and controlled device is inner looping equivalent object and the rear object of inertia district object series connection.
When boiler operatiopn operating mode Rapid Variable Design causes steam temperature fluctuation, for Superheated Steam Temperature Control System Applied, need desuperheating water of superheater flow significantly to adjust to maintain overheating steam temperature and stablize; For Reheated-steam Temperature Control System, due to gas baffle or tilting burner executing agency reliability is low, poor linearity, the reason such as slow in one's movements, still rely on reheater attemperation water flow significantly to adjust to maintain reheat steam temperature and stablize.When attemperation water flow significantly changes, all there is desuperheating water and impact leading steam temperature measuring point phenomenon in many boilers, becomes the major reason affecting control of steam temperature quality.
At present, between the desuperheating water spout of spray desuperheating device and jet chimney, one section of aluminium alloy sleeve pipe is all installed.Aluminium alloy sleeve pipe resistance to sudden heating is well again attachment of nonpressure parts simultaneously, desuperheating water can be avoided directly to be sprayed onto on jet chimney tube wall and cause thermal stress to change.But laminar flow phenomenon appears in the steam after this also makes spray desuperheating device: when desuperheating water sprays in a large number, pipeline center's vapor (steam) temperature is low and to press close to pipeline wall place vapor (steam) temperature high.Boiler adopts thermocouple measurement vapor (steam) temperature, when leading steam temperature measuring point distance spray desuperheating device is nearer, measure vapor (steam) temperature that the temperature that obtains is pipeline center and the not mean temperature of steam in pipeline, occur the abnormal situation on the low side of leading steam temperature, namely this be that desuperheating water impacts leading steam temperature measuring point phenomenon.Meanwhile, because water and steam fully can mix in longer pipeline, can not have an impact to controlled steam temperature so desuperheating water impacts leading steam temperature measuring point.
When desuperheating water occurring and impacting leading steam temperature measuring point phenomenon, control of steam temperature quality can be caused significantly to decline.Overall steam temperature controlled device comprises leading district object and inertia district object.The gain of overall steam temperature controlled device is formed after three parts are multiplied, and Part I is the gain of desuperheating water valve opening to attemperation water flow
k 1, Part II is the gain of attemperation water flow to leading steam temperature
k 2, Part III is the gain of leading steam temperature to controlled steam temperature
k 3.
k 1with
k 2product be leading district target gain,
k 3for inertia district target gain.When steam flow of boiler is certain,
k 2with
k 3a product closely constant, namely specific discharge desuperheating water change cause the variable quantity of controlled steam temperature to be certain.When there is desuperheating water and impacting leading steam temperature measuring point phenomenon,
k 2with
k 3product also closely this constant, only
k 2it is bigger than normal abnormally,
k 3less than normal abnormally.For cascade control system, because the inertia of leading district object is very little, the robustness of inner looping is fine, even if larger change appears in the gain of leading district, also very little on whole control loop Control platform impact.But really not so for external loop, due to inertia district object inertia and delay all very large, there is small change in target gain, all can have a strong impact on Systematical control quality.For the cascade control system of a PID controller parameter of having adjusted, when external loop gain diminishes, the response of controlled variable will become very slow, and when external loop gain becomes large, control system can become unstable.
Summary of the invention
The object of the invention is to the deficiency for prior art, there is provided a kind of station boiler that the method for dynamic compensation controlled device change in gain when overheated, reheater desuperheating water impacts leading steam temperature measuring point phenomenon occurs, to improve, station boiler is overheated, the Control platform of Reheated-steam Temperature Control System.
Problem of the present invention realizes with following technical proposals:
In a kind of Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, overheated at station boiler of described method, desuperheating water is set in reheat steam temperature cascade control system and impacts the online computing module of leading steam temperature measuring point correction factor, the correction factor that desuperheating water impacts leading steam temperature measuring point is online calculated by this module, by the deviation of steam temperature setting value (be called for short steam temperature definite value) and controlled steam temperature value of feedback (being called for short controlled steam temperature) divided by this correction factor to compensate the change of inertia district target gain, the output of secondary controller is multiplied by this correction factor to compensate the target gain change of leading district, thus realize the dynamic compensation that desuperheating water impacts leading steam temperature measuring point.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and the on-line calculation method that described desuperheating water impacts leading steam temperature measuring point correction factor is:
The secondary controller output signal of overheated, the reheat steam temperature cascade control system of station boiler is through Desuperheating water regulating valve after non-linear and steam flow gain compensation, enter reference model, reference model export with overheated, reheating direct-contact desuperheater before steam temperature signal sue for peace after obtain leading steam temperature Signal estimation value, leading steam temperature Signal estimation value is multiplied with leading steam temperature Signal estimation value after deducting actual leading steam temperature signal again and enters PID controller, PID controller export add 100 and impact leading steam temperature measuring point correction factor divided by obtaining desuperheating water after 100 again.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and the method for the output signal of steam temperature cascade control system secondary controller being carried out to Desuperheating water regulating valve nonlinear characteristic and steam flow gain compensation is:
Attemperation water flow signal is successively divided by control valve opening signal, steam flow signal and calculation compensation coefficient C
kafter be multiplied by the output signal of steam temperature cascade control system secondary controller, realize the compensation to steam temperature cascade control system secondary controller output signal, calculation compensation coefficient C
kcalculated by following formula:
Wherein:
q w15for attemperation water flow under typical condition, kg/s;
v w15for Desuperheating water regulating valve aperture under typical condition, %;
q sefor steam flow under typical condition, kg/s.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and described reference model is the transfer function of the leading district object obtained by the identification of Desuperheating water regulating valve aperture disturbance experiments under typical condition.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, desuperheating water impacts before leading steam temperature measuring point carries out dynamic compensation in Stream Temperature Control System, first should judge whether that there is desuperheating water impacts leading steam temperature measuring point phenomenon, concrete grammar is as follows:
If
set up, be then judged as that desuperheating water occurs impacts leading steam temperature measuring point phenomenon, otherwise be judged as that desuperheating water does not occur impacts leading steam temperature measuring point phenomenon.
In formula:
t s1for overheated, reheating direct-contact desuperheater inlet steam temperature, DEG C;
t s2cfor leading steam temperature calculated value, DEG C;
t s2for leading steam temperature measured value, DEG C.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and that leading steam temperature calculated value adopts is overheated, specific steam enthalpy is obtained by properties of water and steam standard (IAPWS-IF97) formulae discovery after reheater steam pressure and direct-contact desuperheater;
Wherein specific steam enthalpy computational methods after direct-contact desuperheater:
，
In formula:
h s2cfor attemperator outlet vapor specific enthalpy calculated value, kJ/kg;
q s1for attemperator inlet steam flow, kg/s;
h s1for attemperator inlet steam specific enthalpy, kJ/kg;
q wfor attemperator attemperation water flow, kg/s;
h wfor attemperator desuperheating water specific enthalpy, kJ/kg.
In above-mentioned Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and described typical condition can select boiler 80% rated load, Desuperheating water regulating valve aperture 15%.
The invention has the beneficial effects as follows:
(1) compensation effect is good.Due to model reference adaptive link for be leading district object, the simple inertia time of object structure is little, easily obtains reference model accurately, and the degree of accuracy that identification desuperheating water impacts leading steam temperature measuring point correction factor is also higher.Therefore the technical scheme that the present invention proposes effectively can improve the Control platform that desuperheating water impacts steam temperature in leading steam temperature measuring point situation, improves boiler operatiopn security and economy.Be specially adapted to the fired power generating unit participating in peak load regulation network and primary frequency modulation, generation load frequent variations.
(2) field conduct is convenient.The present invention is based on serials control, and only need in inner looping, add a model reference adaptive link, introduce in control system inner looping and external loop and revise, master selector, secondary controller parameter all remain unchanged.Scene only needs model reference adaptive link PID controller parameter of adjusting, and debugging is convenient.Do not need to increase any hardware device simultaneously.
(3) control effects is good.Owing to have employed model reference self-adapting control in inner looping, while compensation desuperheating water impacts leading steam temperature measuring point, also effectively can overcome that spray desuperheating valve is non-linear, steam flow change the adverse effect caused control system, raising Control platform.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the structure chart of steam temperature cascade control system;
Fig. 2 is Control system architecture figure of the present invention.In Fig. 2, dotted line frame goes out the online computing module of desuperheating water impact leading steam temperature measuring point correction factor that part increases on cascade control system basis for described control system of the present invention.Its logical construction is: attemperation water flow signal is successively divided by control valve opening signal, steam flow signal, calculation compensation coefficient C
kafter, be multiplied by former cascade control system secondary controller output signal, gained signal enters leading district Object Reference Model, and before the output signal of reference model and attemperator, steam temperature signal obtains leading steam temperature Signal estimation value after suing for peace; PID adjuster is entered after the difference that leading steam temperature estimate deducts leading steam temperature actual value is multiplied with leading steam temperature estimate again, PID regulator output signal add 100 and again divided by the correction factor obtaining desuperheating water after 100 and impact leading steam temperature measuring point, in former cascade control system, the deviation of steam temperature setting value and controlled steam temperature is divided by this correction factor, and this correction factor is multiplied by the output of secondary controller.
In literary composition, each symbol inventory is: C
kfor calculation compensation coefficient, 1/%;
q w15for attemperation water flow under typical condition, kg/s;
v w15for Desuperheating water regulating valve aperture under typical condition, %;
q sefor steam flow under typical condition, kg/s;
t s1for direct-contact desuperheater inlet steam temperature, DEG C;
t s2cfor leading steam temperature calculated value, DEG C;
t s2for leading steam temperature measured value, DEG C;
k 20for unit attemperation water flow change causes the variable quantity of specific discharge leading district vapor (steam) temperature, DEG C s/kg;
k 30for unit flow leading district vapor (steam) temperature change causes the variable quantity of the controlled steam temperature of specific discharge, DEG C/DEG C; c
0for constant, DEG C s/kg;
k xfor desuperheating water impacts leading steam temperature measuring point correction factor, dimensionless;
k 21for during desuperheating water impact leading steam temperature measuring point, unit attemperation water flow change causes the variable quantity of specific discharge leading district vapor (steam) temperature, DEG C s/kg;
k 31for specific discharge leading district vapor (steam) temperature change during desuperheating water impact leading steam temperature measuring point causes the variable quantity of the controlled steam temperature of specific discharge, DEG C/DEG C;
q s1for attemperator inlet steam flow, kg/s;
h s1for attemperator inlet steam specific enthalpy, kJ/kg, adopts attemperator inlet steam temperature, steam pressure to calculate and obtains;
q wfor attemperator attemperation water flow, kg/s;
h wfor attemperator desuperheating water specific enthalpy, kJ/kg, employing desuperheating water temperature, calculation of pressure obtain;
h s2cfor attemperator outlet vapor specific enthalpy calculated value, kJ/kg.
Detailed description of the invention
The present invention is based on cascade control system, model reference self-adapting control is adopted at inner looping, while automatically adapting to the target gain change of leading district, calculate inertia district target gain according to spray desuperheating Process Energy equilibrium relation and change and obtain a correction factor.Then before correction factor being introduced external loop PID controller, Temperature Deviation signal is revised, realize dynamic compensation function.Because in cascade control system, the inertia of inner looping controlled device is very little, the inertia district target gain calculated has the good degree of accuracy and real-time, increase the Stream Temperature Control System after dynamic compensation, when various factors causes attemperation water flow significantly to change generation desuperheating water impact leading steam temperature measuring point phenomenon, the original Control platform of system can be ensured.
Know-why of the present invention:
Desuperheating water impacts leading steam temperature measuring point, because leading steam temperature measuring point place causes because steam-water mixing is uneven, but fully mix when steam water interface flow to controlled steam temperature measuring point, controlled steam temperature can not produce exception.So when desuperheating water temperature one timing, unit attemperation water flow change causes a variable quantity closely constant of the controlled steam temperature of specific discharge.That is:
（1）
Wherein:
k 20for unit attemperation water flow change causes the variable quantity of specific discharge leading district vapor (steam) temperature, DEG C s/kg;
k 30for unit flow leading district vapor (steam) temperature change causes the variable quantity of the controlled steam temperature of specific discharge, DEG C/DEG C; c
0for constant, DEG C s/kg.
When desuperheating water occurring and impacting leading steam temperature measuring point, the leading steam temperature of measurement is equivalent to
k 20basis on impact leading steam temperature measuring point correction factor divided by desuperheating water
k x:
（2）
Wherein:
k 21for during desuperheating water impact leading steam temperature measuring point, unit attemperation water flow change causes the variable quantity of specific discharge leading district vapor (steam) temperature, DEG C s/kg;
k xfor desuperheating water impacts leading steam temperature measuring point correction factor, dimensionless, 0<
k x≤ 1.
Have simultaneously:
（3）
Can derive and obtain:
（4）
Wherein:
k 31for specific discharge leading district vapor (steam) temperature change during desuperheating water impact leading steam temperature measuring point causes the variable quantity of the controlled steam temperature of specific discharge, DEG C/DEG C.
In Stream Temperature Control System, online calculated by a model reference adaptive link
k x, will
k xbe respectively used to target compensation leading district's change in gain and inertia district change in gain, then can overcome the impact that desuperheating water impacts leading steam temperature measuring point.
Technical scheme of the present invention:
Stream Temperature Control System is based on serials control, increase by a model reference adaptive link and online calculate the correction factor that desuperheating water impacts leading steam temperature measuring point, the deviation of steam temperature setting value and controlled steam temperature is used for divided by this correction factor the change compensating inertia district target gain, secondary controller output is multiplied by this correction factor and is used for compensating the target gain change of leading district.Control system architecture figure as shown in Figure 2.Impact the dynamic compensation logic of leading steam temperature measuring point in figure in dotted line frame for overcoming desuperheating water, in figure in division function block, solid arrow represents dividend, and empty arrow represents divisor.
Except generation desuperheating water impacts leading steam temperature measuring point, leading district target gain also affects by other factors, needs to be compensated when designing Self Adaptive Control link.These factors comprise: (1) Desuperheating water regulating valve is non-linear.On-the-spot Desuperheating water regulating valve all exists significantly non-linear: when control valve opening is less, namely control valve opening slightly changes attemperation water flow has significant change; When control valve opening is larger, control valve opening significant change and attemperation water flow changes not quite.(2) steam flow change.When under attemperation water flow one stable condition, steam flow Yue great leading district's gain absolute value is less.The principle compensated in accompanying drawing 2 is: (1) uses attemperation water flow to calculate the actual aperture of Desuperheating water regulating valve divided by control valve opening, non-linear in order to compensate Desuperheating water regulating valve.(2) steam flow introduces correction in the mode of divisor, compensates the situation because steam flow increase causes leading district target gain to diminish.
Constant C in accompanying drawing 2
kfor calculation compensation coefficient, 1/%.Under adopting typical condition, service data calculates.Typical condition can select boiler 80% rated load, Desuperheating water regulating valve aperture 15%.C
kcomputational methods are:
（5）
Wherein:
q w15for attemperation water flow under typical condition, kg/s;
v w15for Desuperheating water regulating valve aperture under typical condition, %;
q sefor steam flow under typical condition, kg/s.
In accompanying drawing 2, reference model is the transfer function of the leading district object obtained by the identification of Desuperheating water regulating valve aperture disturbance experiments under typical condition.
After secondary controller exports and steam flow gain compensation non-linear through Desuperheating water regulating valve in accompanying drawing 2, enter reference model, reference model exports and before direct-contact desuperheater, steam temperature obtains leading steam temperature estimate after suing for peace.Enter PID controller after the difference that leading steam temperature estimate deducts leading steam temperature actual value is multiplied with leading steam temperature estimate again, PID controller export add 100 and impact leading steam temperature measuring point correction factor divided by obtaining desuperheating water after 100 again.
In accompanying drawing 2, desuperheating water impacts the output that leading steam temperature measuring point correction factor regulates with the form correction of product pair, inputs with the deviation of the form correction master selector of divisor.
The course of work of dynamic compensation logic of the present invention is:
When there is not desuperheating water and impacting leading steam temperature measuring point, in an initial condition, leading steam temperature estimate is equal with leading steam temperature actual value, Self Adaptive Control link PID is input as 0, therefore PID controller exports is 0, it is 1 that the desuperheating water calculated impacts leading steam temperature measuring point correction factor, does not carry out any correction.
When desuperheating water occurring and impacting leading steam temperature measuring point, in an initial condition, leading steam temperature actual value is lower than leading steam temperature estimate, and both differences are positive number, but reference model is negative object, and therefore PID controller is input as negative signal.Such PID controller exports and is reduced to negative, and the desuperheating water calculated impacts leading steam temperature measuring point correction factor and is less than 1, and under secondary controller exports constant condition, desuperheating water valve opening reduces, until leading steam temperature actual value equals leading steam temperature estimate again.And desuperheating water impacts after leading steam temperature measuring point correction factor is less than 1, when the difference of steam temperature setting value and controlled steam temperature is certain, be equivalent to the gain adding master selector, cause the situation of inertia district gain reduction to compensate to impacting leading steam temperature measuring point because of desuperheating water.
The present invention is implemented by following steps:
(1) desuperheating water impacts the judgement of leading steam temperature measuring point.Observe unit operation historical data, judge whether that desuperheating water occurs impacts leading steam temperature measuring point phenomenon according to energy balance principle.The energy-balance equation of spray desuperheating process is formula 6.
（6）
Obtain after distortion:
（7）
In formula 6,7:
q s1for attemperator inlet steam flow, kg/s;
h s1for attemperator inlet steam specific enthalpy, kJ/kg, adopts attemperator inlet steam temperature, steam pressure to calculate and obtains;
q wfor attemperator attemperation water flow, kg/s;
h wfor attemperator desuperheating water specific enthalpy, kJ/kg, employing desuperheating water temperature, calculation of pressure obtain;
h s2cfor attemperator outlet vapor specific enthalpy calculated value, kJ/kg.
Attemperator outlet vapor specific enthalpy calculated value and steam pressure can be utilized to calculate attemperator outlet steam temperature and leading steam temperature calculated value by properties of water and steam, compare with leading steam temperature measured value.When formula 8 is set up, can be judged as that desuperheating water occurs impacts leading steam temperature measuring point phenomenon.
（8）
In formula 8:
t s1for direct-contact desuperheater inlet steam temperature, DEG C;
t s2cfor leading steam temperature calculated value, DEG C;
t s2for leading steam temperature measured value, DEG C.
When boiler exists desuperheating water impact leading steam temperature measuring point phenomenon, the present invention program can be applied and implement following steps.
(2) Desuperheating water regulating valve aperture disturbance experiments.By the transfer function of Desuperheating water regulating valve aperture disturbance experiments determination controlled device near typical condition (boiler 80% rated load, Desuperheating water regulating valve aperture is 15%).Near boiler 80% rated load, control of steam temperature loop is cut to Non-follow control state, Desuperheating water regulating valve aperture is adjusted to about 15%.After leading steam temperature, controlled steam temperature and boiler combustion status are all stable, Desuperheating water regulating valve aperture that step increases (or minimizing), record Desuperheating water regulating valve aperture (unit %), attemperation water flow (units/kg/s), leading steam temperature (unit DEG C), controlled steam temperature (unit DEG C) response curve, utilize the transfer function of response-curve method identification leading district and inertia district object.
(3) compensation logic design.The compensation logic of accompanying drawing 2 is realized in the mode of configuration, wherein C in Steam Temperature for Boiler control system
kemploying formula 5 calculates, and reference model is the transfer function of the leading district object that identification obtains.
(4) parameter testing.First model reference adaptive link PID controller exported and be forced to 0, the leading district obtained according to identification and inertia district target transfer function are adjusted master selector and secondary controller parameter, and method is identical with cascade control system setting method.After treating parameter tuning, model reference adaptive link PID controller is exported the upper limit and is set to 100, lower limit is set to-87.5, model reference adaptive link of adjusting PID controller ratio, the time of integration, until obtain satisfied Control platform.
Claims (6)
1. in a Steam Temperature for Boiler control system, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, it is characterized in that, overheated at station boiler of described method, desuperheating water is set in reheat steam temperature cascade control system and impacts the online computing module of leading steam temperature measuring point correction factor, the correction factor that desuperheating water impacts leading steam temperature measuring point is online calculated by this module, by the deviation of steam temperature setting value (be called for short steam temperature definite value) and controlled steam temperature value of feedback (being called for short controlled steam temperature) divided by this correction factor to compensate the change of inertia district target gain, the output of secondary controller is multiplied by this correction factor to compensate the target gain change of leading district, thus realize the dynamic compensation that desuperheating water impacts leading steam temperature measuring point,
The on-line calculation method that described desuperheating water impacts leading steam temperature measuring point correction factor is:
The secondary controller output signal of overheated, the reheat steam temperature cascade control system of station boiler is through Desuperheating water regulating valve after non-linear and steam flow gain compensation, enter reference model, reference model export with overheated, reheating direct-contact desuperheater before steam temperature signal sue for peace after obtain leading steam temperature Signal estimation value, leading steam temperature Signal estimation value is multiplied with leading steam temperature Signal estimation value after deducting actual leading steam temperature signal again and enters PID controller, PID controller export add 100 and impact leading steam temperature measuring point correction factor divided by obtaining desuperheating water after 100 again.
2. in a kind of Steam Temperature for Boiler control system according to claim 1, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, it is characterized in that, the method for the output signal of steam temperature cascade control system secondary controller being carried out to Desuperheating water regulating valve nonlinear characteristic and steam flow gain compensation is:
Attemperation water flow signal is successively divided by control valve opening signal, steam flow signal and calculation compensation coefficient C
kafter be multiplied by the output signal of steam temperature cascade control system secondary controller, realize the compensation to steam temperature cascade control system secondary controller output signal, calculation compensation coefficient C
kcalculated by following formula:
，
Wherein:
q w15for attemperation water flow under typical condition, kg/s;
v w15for Desuperheating water regulating valve aperture under typical condition, %;
q sefor steam flow under typical condition, kg/s.
3. in a kind of Steam Temperature for Boiler control system according to claim 2, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, it is characterized in that, described reference model is the transfer function of the leading district object obtained by the identification of Desuperheating water regulating valve aperture disturbance experiments under typical condition.
4. in a kind of Steam Temperature for Boiler control system according to claim 3, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, it is characterized in that, desuperheating water impacts before leading steam temperature measuring point carries out dynamic compensation in Stream Temperature Control System, first should judge whether that there is desuperheating water impacts leading steam temperature measuring point phenomenon, concrete grammar is as follows:
If
set up, be then judged as that desuperheating water occurs impacts leading steam temperature measuring point phenomenon, otherwise be judged as that desuperheating water does not occur impacts leading steam temperature measuring point phenomenon,
In formula:
t s1for overheated, reheating direct-contact desuperheater inlet steam temperature, DEG C;
t s2cfor leading steam temperature calculated value, DEG C;
t s2for leading steam temperature measured value, DEG C.
5. in a kind of Steam Temperature for Boiler control system according to claim 4, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, it is characterized in that, after leading steam temperature calculated value adopts overheated, reheater steam pressure and direct-contact desuperheater, specific steam enthalpy is calculated by international properties of water and steam normalized form;
Wherein specific steam enthalpy computational methods after direct-contact desuperheater:
In formula:
h s2cfor attemperator outlet vapor specific enthalpy calculated value, kJ/kg;
q s1for attemperator inlet steam flow, kg/s;
h s1for attemperator inlet steam specific enthalpy, kJ/kg;
q wfor attemperator attemperation water flow, kg/s;
h wfor attemperator desuperheating water specific enthalpy, kJ/kg.
6. in a kind of Steam Temperature for Boiler control system according to claim 5, desuperheating water impacts the dynamic compensation method of leading steam temperature measuring point, and it is characterized in that, described typical condition can select boiler 80% rated load, Desuperheating water regulating valve aperture 15%.
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| CN103676651B (en) * | 2013-12-02 | 2018-03-06 | 国家电网公司 | Steam Temperature for Boiler forecast Control Algorithm based on state observation model |
| CN104456513B (en) * | 2014-11-11 | 2016-02-10 | 南京科远自动化集团股份有限公司 | A kind of thermal power plant Stream temperature estimation optimizing control method |
| CN105242572B (en) * | 2015-10-23 | 2017-12-26 | 广东电网有限责任公司电力科学研究院 | Power Plant Thermal process mixes discrimination method and system |
| CN105953207B (en) * | 2016-05-20 | 2018-05-08 | 华北电力大学（保定） | A kind of station boiler Stream Temperature Control System of high-quality |
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| CN108361683B (en) * | 2018-05-14 | 2023-12-22 | 华能国际电力股份有限公司海门电厂 | Full load section reheat temperature intelligent control system |
| CN110703718A (en) * | 2019-11-13 | 2020-01-17 | 东北大学 | Industrial process control method based on signal compensation |
| CN110824927B (en) * | 2019-11-29 | 2022-06-03 | 江苏方天电力技术有限公司 | Thermal power generating unit primary frequency modulation accurate adjustment method with self-adaptive learning characteristic |
| CN113189861B (en) * | 2021-04-27 | 2022-09-27 | 国能南京电力试验研究有限公司 | Design method of main steam temperature control system equivalent to post-desuperheater temperature control |
| CN113932215A (en) * | 2021-10-09 | 2022-01-14 | 西安热工研究院有限公司 | Cascade main steam temperature control system and method based on prediction algorithm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003148704A (en) * | 2001-11-15 | 2003-05-21 | Tlv Co Ltd | Steam attemper |
| CN102360176A (en) * | 2011-07-21 | 2012-02-22 | 山东省电力学校 | Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller |
| CN102401371A (en) * | 2011-12-06 | 2012-04-04 | 东南大学 | Reheated gas temperature optimization control method based on multi-variable predictive control |
| JP2013040695A (en) * | 2011-08-11 | 2013-02-28 | Toshiba Corp | Apparatus and device for controlling vapor temperature |
| CN103134046A (en) * | 2013-02-22 | 2013-06-05 | 东南大学 | Superheated steam temperature two-stage coordination, prediction and control method of thermal power generating unit |
-
2013
- 2013-07-22 CN CN201310308005.6A patent/CN103343961B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003148704A (en) * | 2001-11-15 | 2003-05-21 | Tlv Co Ltd | Steam attemper |
| CN102360176A (en) * | 2011-07-21 | 2012-02-22 | 山东省电力学校 | Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller |
| JP2013040695A (en) * | 2011-08-11 | 2013-02-28 | Toshiba Corp | Apparatus and device for controlling vapor temperature |
| CN102401371A (en) * | 2011-12-06 | 2012-04-04 | 东南大学 | Reheated gas temperature optimization control method based on multi-variable predictive control |
| CN103134046A (en) * | 2013-02-22 | 2013-06-05 | 东南大学 | Superheated steam temperature two-stage coordination, prediction and control method of thermal power generating unit |
Non-Patent Citations (3)
| Title |
|---|
| 《一次调频工况下汽温系统抗燃烧扰动能力分析》;邹晓昕;《电力科学与工程》;20080131;第44-47页 * |
| 《再热器减温水开环自适应高阶导前微分控制》;王琪等;《华东电力》;20111130;第1901-1903页 * |
| 《火力发电厂再热汽温控制系统现状频域分析》;王勇等;《华北电力技术》;20101231;第10-14页 * |
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