CN105759864B - A kind of compensation adjustment method of fired power generating unit main steam pressure - Google Patents
A kind of compensation adjustment method of fired power generating unit main steam pressure Download PDFInfo
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- CN105759864B CN105759864B CN201610272514.1A CN201610272514A CN105759864B CN 105759864 B CN105759864 B CN 105759864B CN 201610272514 A CN201610272514 A CN 201610272514A CN 105759864 B CN105759864 B CN 105759864B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/202—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by an electric motor
Abstract
A kind of compensation adjustment method of fired power generating unit main steam pressure, the deviation signal of main vapour pressure actual value and setting value is superimposed to after differential and amplitude limiting processing in the level-one overheating steam temperature setting value of level-one Superheated Steam Temperature Control System Applied by the method, utilizes primary superheater attemperation water flow compensation adjustment main vapour pressure；The deviation signal of secondary superheater steam temperature setting value and actual value is superimposed to after differential and dead zone, amplitude limiting processing in the generation load setting value of coordinated control system simultaneously, when the rate of change of secondary superheater Temperature Deviation signal crosses dead zone section, reduce secondary superheater Temperature Deviation by changing generation load.The present invention utilizes primary superheater attemperation water flow compensation adjustment main steam pressure deviation; and secondary superheater steam temperature relay protective scheme is additionally arranged in generation load control system; this method can effectively improve the Control platform of main steam pressure under the premise of significantly reducing super-heated steam temperature control quality, reduce the fluctuating range of main vapour pressure and fuel quantity during fired power generating unit varying duty.
Description
Technical field
The present invention relates to a kind of sides using primary superheater attemperation water flow compensation adjustment fired power generating unit main steam pressure
Method belongs to control technology field.
Background technology
Large capacity fired power generating unit generally adjusts superheat steam temperature, level-one spray desuperheating by the way of two-stage spray desuperheating
Device plays coarse adjustment steam temperature before being mounted on pendant superheater, prevents pendant superheater overtemperature of tube wall, maintains at two level direct-contact desuperheater
Effect in reasonable workspace；Two level direct-contact desuperheater plays the accurate work for adjusting overheating steam temperature before being mounted on high temperature superheater
With.In engineering it is generally acknowledged that coupled between overheating steam temperature controlled device and main steam pressure-generation load controlled device it is weaker, because
This traditional Superheated Steam Temperature Control System Applied and the coordinated control system of control generation load-main vapour pressure are mutual indepedent.
As the scale of the unstable power generating source such as the transformation of China's power structure and wind-powered electricity generation is grid-connected, fired power generating unit needs
More and more peak-frequency regulation tasks are undertaken, the frequent significantly change of unit generation load instruction leads to main vapour pressure, overheating steam temperature
Equal key parameters Control platform is deteriorated.Main reason is that boiler combustion rate can not with steam flow when unit quick load change
Keep synchronous variation completely in time.By taking quick load up process as an example, load variations initial stage needs to store by boiler release
Heat increases steam flow to promote generation load, but since boiler pulverizing process has very big inertia, the increased fuel quantity of boiler
Not yet enter stove chamber inner combustion, steam flow causes main vapour pressure and overheating steam temperature to decline more than combustion rate；After in load variations
The increased fuel quantity of phase boiler discharges heat in stove chamber inner combustion, becomes the increased principal element of steam flow, steam flow is same
Combustion rate, which reaches dynamic equilibrium, makes main vapour pressure and overheating steam temperature tend to steady；Steam flow no longer increases after load variations
Add, and the inertia of powder link processed so that increased fuel quantity goes successively to stove chamber inner combustion, steam flow is caused less than combustion rate
Main vapour pressure and overheating steam temperature rise.
Level-one attemperation water flow is both greater than two level attemperation water flow when subcritical drum boiler and supercritical DC furnace design.Machine
When group load acute variation, operations staff often more focuses on maintaining two level direct-contact desuperheater to be in using level-one direct-contact desuperheater
The workspace of safety.First stage steam definite value is arranged to reduced levels, deliberately increases level-one attemperation water flow reduction two level and subtracts
Warm water flow, in case can quickly increase two level attemperation water flow in overtemperature reduces steam temperature.Lead to level-one desuperheat flow in this way
Amount often reaches the 7% to 10% or so of the specified main steam flow of unit.A large amount of desuperheating waters, which are injected in superheater, absorbs metal
Tube wall accumulation of heat rapid vaporization, can be such that main vapour pressure significantly increases.
Substantially, unit quick load change needs to utilize boiler heat storage, and is not only resulted in using the process of boiler heat storage
Steam pressure changes, while also resulting in vapor (steam) temperature and changing.And desuperheating water of superheater control system will then ensure
The stabilization of overheating steam temperature is effectively equivalent to reduce the available regenerative capacity of boiler, and the smaller main vapour pressure of boiler heat storage is got over
It is difficult to control.Under the control system, the fluctuation of main vapour pressure can cause boiler oil amount to fluctuate, and boiler oil amount fluctuates
Overheating steam temperature can be caused to fluctuate.Main vapour pressure and overheating steam temperature controlled device all there is big inertia large delay characteristic to be difficult to control,
Harmful competition between the two can cause unit entirety control effect to be deteriorated.
Therefore, the Control platform of main vapour pressure and overheating steam temperature how is taken into account, improving unit entirety control effect just becomes
The project that related researcher faces.
Invention content
It is an object of the invention to be directed to the drawback of the prior art, a kind of compensation tune of fired power generating unit main steam pressure is provided
There is fluctuation to avoid main vapour pressure in the frequent change procedure of fired power generating unit generation load and Superheat Steam Temperature in section method.
Problem of the present invention is realized with following technical proposals：
A kind of compensation adjustment method of fired power generating unit main steam pressure, the method is by main vapour pressure actual value and setting value
Deviation signal the level-one overheating steam temperature setting value of level-one Superheated Steam Temperature Control System Applied is superimposed to after differential and amplitude limiting processing
On, utilize primary superheater attemperation water flow compensation adjustment main vapour pressure；Simultaneously by secondary superheater steam temperature setting value and actual value
Deviation signal be superimposed in the generation load setting value of coordinated control system after differential and dead zone, amplitude limiting processing, two
When the rate of change of grade overheating steam temperature deviation signal crosses dead zone section, reduce secondary superheater steam temperature by changing generation load
Deviation.
The compensation adjustment method of above-mentioned fired power generating unit main steam pressure believes the deviation of main vapour pressure actual value and setting value
Number carrying out differential and amplitude limiting processing is as follows：
A. main vapour pressure actual value subtracts main vapour pressure setting and is worth to main vapour pressure deviation signal；
B. main vapour pressure deviation signal subtracts it by first order inertial loop treated signal, obtains main vapour pressure deviation
Differential signal；
C. main vapour pressure deviation signal is by the multiple spot polygronal function that is set as dead zone function treated output valve and master
Steam pressure deviation differential signal is multiplied, and obtains by the revised main vapour pressure deviation differential signal in dead zone；
D. by the revised main vapour pressure deviation differential signal in dead zone after differential gain effect processing, using setting
Being set to dead zone adds the multiple spot polygronal function of amplitude limit function to handle, and obtained output valve is added with former level-one overheating steam temperature setting value,
Form new level-one overheating steam temperature duty setting signal.
The compensation adjustment method of above-mentioned fired power generating unit main steam pressure, to the inclined of secondary superheater steam temperature setting value and actual value
Difference signal carries out differential and amplitude limiting processing is as follows：
A. secondary superheater steam temperature actual value subtracts secondary superheater steam temperature setting value, obtains secondary superheater Temperature Deviation signal；
B. secondary superheater Temperature Deviation signal subtracts it by first order inertial loop treated signal, obtains secondary superheater
Temperature Deviation differential signal；
C. secondary superheater Temperature Deviation signal is by the multiple spot polygronal function that is set as dead zone function treated output valve
It is multiplied, is obtained by the revised secondary superheater Temperature Deviation differential signal in dead zone with secondary superheater Temperature Deviation differential signal；
D. add amplitude limit function by being set as dead zone by the revised secondary superheater Temperature Deviation differential signal in dead zone
The processing of multiple spot polygronal function, after obtained output valve is handled using the differential gain, output valve and primary electric load setting value phase
Add, forms new generation load duty setting signal.
The present invention utilizes primary superheater attemperation water flow compensation adjustment main steam pressure deviation, and in coordinated control system
In be additionally arranged secondary superheater Temperature Deviation relay protective scheme, this method can be in the premise for significantly reducing super-heated steam temperature control quality
Under effectively improve the Control platform of main steam pressure, reduce the fluctuation of main vapour pressure and fuel quantity during fired power generating unit varying duty
Amplitude.
In addition, also there is this method control logic explicit physical meaning, configuration to realize simple (only there are two tuning parameters),
The advantages that debugging process is simple and convenient.
Description of the drawings
Fig. 1 is level-one overheating steam temperature definite value logic；
Fig. 2 is Temperature Deviation relay protective scheme.
The meaning of each function module is in figure：DEV1~DEV4 is the subtraction block of the first subtraction block~the 4th；LAG1 is
First one order inertia module；LAG2 is the second one order inertia module；1~F of F (x) (x) 4 be the first multiple spot polygronal function module~
4th multiple spot polygronal function module；MUL1 is the first multiplier module；MUL2 is the second multiplier module；K1 is the first gain module；
K2 is the second gain module；SUM1 is the first addition module；SUM2 is the second addition module.
In Fig. 1,2, the control logic in dotted line frame to be newly increased on the basis of former control logic.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
The problem of frequently variation causes main vapour pressure, overheating steam temperature fluctuation for fired power generating unit generation load, this hair
A kind of method using primary superheater attemperation water flow compensation adjustment main vapour pressure of bright proposition.
It is analyzed from design, the control targe of level-one Superheated Steam Temperature Control System Applied is not unique, it is only necessary to overheat level-one
Steam temperature is maintained within a certain range, therefore it has the condition of compensation adjustment main vapour pressure.After desuperheating water of superheater sprays into
Main steam pressure can be influenced rapidly, and the rapidity of compensation adjustment process is substantially better than fuel quantity adjusting.Meanwhile desuperheating water is adjusted
The high quick action of threshold sensitivity, executing agency's characteristic are not the principal elements for restricting control system performance.But due to crossing hot vapour
Temperature variation causes the variable quantity of boiler heat storage relatively small, so level-one overheating steam temperature is not suitable for the quiet of compensation adjustment main vapour pressure
State deviation, and the variable quantity of suitable compensation adjustment main vapour pressure deviation, the i.e. differential of main vapour pressure deviation.
Boiler oil amount there are prodigious inertia and delays main vapour pressure controlled device, to ensure the control of main vapour pressure
Quality, boiler side controller must use prodigious derivation regulating action, therefore can lead to pot when pressure divergence quickly changes
Stove fuel quantity significantly change, and the significantly change of fuel quantity can lead to unstable boiler combustion and coal pulverizer, primary air fan work
Make state deteriorating.Therefore the regulating and compensating role of First stage steam can also have while weakening the rate of change of main vapour pressure
Effect reduces the fluctuation of fuel quantity, is conducive to unit safety, economical operation.
The deviation signal of main vapour pressure actual value and setting value is superimposed to one by the present invention after differential and amplitude limiting processing
In grade overheating steam temperature setting value, realize that primary superheater attemperation water flow adjusts main vapour pressure deviation in a manner of the differential action
Function.Simultaneously by the deviation signal of secondary superheater steam temperature setting value and actual value after differential and dead zone, amplitude limiting processing superposition
Onto generation load setting value, realizes and suitably change generation load when quick secondary superheater Temperature Deviation, significantly change to reduce
The function of secondary superheater Temperature Deviation.Main vapour pressure and fuel quantity during fired power generating unit varying duty can be obviously reduced in this method
Fluctuating range.
There are bidirectional couples with main vapour pressure controlled device for overheating steam temperature controlled device.When desuperheating water largely sprays into, subtract
Warm water absorbs superheater metal pipe-wall accumulation of heat rapid vaporization, main vapour pressure can be caused to increase while reducing overheating steam temperature；When
When power generator turbine tune valve opening increases, steam flow is instantly increased also results in overheating steam temperature while reducing main vapour pressure
It reduces；When boiler oil amount increases, boiler combustion rate can lead to overheating steam temperature and main vapour pressure liter prior to steam flow increase
It is high.Due to the inertia and delay time difference of object, attemperation water flow, steam turbine tune valve opening, the input of boiler oil amount are to mistake
The dynamic response time that hot vapour temperature, main vapour pressure have an impact also is different.Main vapour pressure is to attemperation water flow, steam turbine tune
Valve opening, boiler oil amount response time respectively within the scope of 15s~30s, 5s~10s, 200s~350s；And level-one overheats
Steam temperature to attemperation water flow, steam turbine tune valve opening, boiler oil amount response time respectively 120s~250s, 50s~
Within the scope of 100s, 150s~300s.Dynamic using steam temperature, pressure controlled device there are bidirectional couple and to same disturbance input
Response time has differences the two features, by optimized control system design, may be implemented to utilize primary superheater desuperheating water
The flow-compensated function of adjusting main vapour pressure.
When main vapour pressure is high and overheating steam temperature is low, control system can excessively reduce level-one attemperation water flow, reduce master
Steam pressure improves overheating steam temperature simultaneously；When main steam pressure is low and overheating steam temperature is high, control system can excessively increase by one
Grade attemperation water flow, improve main steam pressure reduces overheating steam temperature simultaneously.Compensation adjustment can play correctly under both operating modes
Dual regulation.When main vapour pressure and overheating steam temperature the trend being raised and lowered occur simultaneously, control system still may be used
This poor feature of variation existence time to respond level-one attemperation water flow using main vapour pressure and overheating steam temperature, slightly to reduce
First stage steam Con trolling index is that cost preferentially ensures that main vapour pressure is not out-of-limit.While overheating steam temperature is high main vapour pressure it is high or
While overheating steam temperature is low under the low extreme case of main vapour pressure, control system can increased or decrease steam turbine tune valve opening,
Preferentially ensure the stabilization of overheating steam temperature and main vapour pressure slightly to reduce generation load Control platform as cost.
The core of improvement project is for pressure divergence to be introduced into level-one overheating steam temperature in a manner of derivation regulating action
In control system, the effect using primary superheater attemperation water flow compensation adjustment main vapour pressure is played；By secondary superheater steam temperature
Deviation is introduced into a manner of derivation regulating action in coordinated control system, and logic is retracted together with the pressure in original control system
Play the effect that protectiveness is adjusted.Since primary superheater attemperation water flow is bigger in unit actual moving process, two level mistake
The case where hot vapour temperature and metal pipe-wall overtemperature are than level-one overheating steam temperature and metal pipe-wall overtemperature is more universal, so coordinating control system
The relay protective scheme of secondary superheater steam temperature is designed in system.
Level-one overheating steam temperature in primary superheater attemperation water flow compensation adjustment main vapour pressure method of the present invention is fixed
It is worth logic as shown in Figure 1, two level Temperature Deviation relay protective scheme is as shown in Figure 2.
In Fig. 1, main vapour pressure actual value subtracts main vapour pressure setting and is worth to main vapour pressure deviation signal.Main vapour pressure is inclined
Difference signal subtracts it after first order inertial loop treated signal, obtains main vapour pressure deviation differential signal.Main vapour pressure
Deviation signal is by the multiple spot polygronal function that is set as dead zone function treated output valve and main vapour pressure deviation differential signal
It is multiplied, obtains by the revised main vapour pressure deviation differential signal in dead zone.It is micro- by the revised main vapour pressure deviation in dead zone
Sub-signal adds the multiple spot polygronal function of amplitude limit function to handle, obtains after differential gain effect processing using dead zone is set as
The output valve arrived is added with former level-one overheating steam temperature setting value, forms new level-one overheating steam temperature duty setting signal.
In Fig. 2, secondary superheater steam temperature actual value subtracts the setting of secondary superheater steam temperature and is worth to secondary superheater Temperature Deviation letter
Number.Secondary superheater Temperature Deviation signal subtracts it after first order inertial loop treated signal, obtains secondary superheater steam temperature
Deviation differential signal.Secondary superheater Temperature Deviation signal is by treated the output of the multiple spot polygronal function that is set as dead zone function
After value is multiplied with secondary superheater Temperature Deviation differential signal, obtain by the revised secondary superheater Temperature Deviation differential letter in dead zone
Number.This signal adds the multiple spot polygronal function of amplitude limit function to handle by being set as dead zone, and obtained output valve increases using differential
After benefit reason, output valve is added with primary electric load setting value, forms new generation load duty setting signal.
Invention implementation steps
(1) implementation condition confirms
It needs to confirm that unit has the following conditions within the scope of 50%~100% load variations before implementing the present invention：1. one
Grade Superheated Steam Temperature Control System Applied, which can be put into, to be automatically controlled；2. secondary superheater Stream Temperature Control System can put into and automatically control；③
Pendant superheater metal pipe-wall is without overheating problem；4. Coordinated Control Systems are controlled into vapour tune valve using steam turbine high-pressure cylinder and are sent out
Electric load, boiler oil amount control main vapour pressure, that is, stove with the coordinated control mode based on machine.
(2) Logical Configuration
Logic shown in compares figure 1,2, to level-one overheating steam temperature, coordination control system in unit scattered control system (DCS)
System Logical Configuration is modified.If pendant superheater point arranged on left and right sides is arranged, need respectively to arranged on left and right sides level-one mistake
Hot vapour temperature control system carries out configuration.Wherein：The inertia time of LAG1, LAG2 are disposed as 20s.The parameter of 1~F of F (x) (x) 4
Setting, subcritical drum boiler are shown in Table 1, and supercritical DC furnace is shown in Table 2.
1 subcritical 1~F of drum boiler F (x) (x) of table, 4 parameter setting
2 1~F of supercritical DC furnace F (x) (x) of table, 4 parameter settings
(3) field adjustable
Control logic of the present invention includes two tuning parameters K1, K2, needs to be debugged under operating states of the units.K1 is
The differential gain of primary superheater attemperation water flow compensation adjustment main vapour pressure control, K1 is bigger, and derivative compensation effect is stronger.It is existing
When the debugging of field, K1 is gradually increased by 0, when main vapour pressure generation differential oscillating or First stage steam setting value fluctuating range are super
K1 reaches maximum value when crossing -10 DEG C~6 DEG C, and K1 actual setting values are the 80% of maximum value.K2 is the differential of Temperature Deviation protection
Gain, K2 is bigger, and differential protection appts effect is stronger, but generation load Control platform can be caused to decline, and needs to debug according to field condition
It determines.In addition K2 values are related with unit capacity, and unit capacity is bigger, and K2 is bigger.
Claims (2)
1. a kind of compensation adjustment method of fired power generating unit main steam pressure, characterized in that the method is by main vapour pressure actual value
The level-one for being superimposed to level-one Superheated Steam Temperature Control System Applied after differential and amplitude limiting processing with the deviation signal of setting value crosses hot vapour
In warm setting value, primary superheater attemperation water flow compensation adjustment main vapour pressure is utilized；Simultaneously by secondary superheater steam temperature setting value
The generation load setting value of coordinated control system is superimposed to after differential and dead zone, amplitude limiting processing with the deviation signal of actual value
On, when the rate of change of secondary superheater Temperature Deviation signal crosses dead zone section, reduce two level by changing generation load
Overheating steam temperature deviation；
Differential is carried out to the deviation signal of main vapour pressure actual value and setting value and amplitude limiting processing is as follows：
A. main vapour pressure actual value subtracts main vapour pressure setting and is worth to main vapour pressure deviation signal；
B. main vapour pressure deviation signal subtracts it by first order inertial loop treated signal, obtains main vapour pressure deviation differential
Signal；
C. main vapour pressure deviation signal is by the multiple spot polygronal function that is set as dead zone function treated output valve and main vapour pressure
Power deviation differential signal is multiplied, and obtains by the revised main vapour pressure deviation differential signal in dead zone；
D. by the revised main vapour pressure deviation differential signal in dead zone after differential gain effect processing, using being set as
Dead zone adds the multiple spot polygronal function of amplitude limit function to handle, and obtained output valve is added with former level-one overheating steam temperature setting value, is formed
New level-one overheating steam temperature duty setting signal.
2. a kind of compensation adjustment method of fired power generating unit main steam pressure according to claim 1, characterized in that two level
The deviation signal of overheating steam temperature setting value and actual value carries out differential and dead zone, amplitude limiting processing are as follows：
A. secondary superheater steam temperature actual value subtracts secondary superheater steam temperature setting value, obtains secondary superheater Temperature Deviation signal；
B. secondary superheater Temperature Deviation signal subtracts it by first order inertial loop treated signal, obtains secondary superheater steam temperature
Deviation differential signal；
C. secondary superheater Temperature Deviation signal is by the multiple spot polygronal function that is set as dead zone function treated output valve and two
Grade overheating steam temperature deviation differential signal is multiplied, and obtains by the revised secondary superheater Temperature Deviation differential signal in dead zone；
D. the multiple spot for adding amplitude limit function by being set as dead zone by the revised secondary superheater Temperature Deviation differential signal in dead zone
Polygronal function processing, after obtained output valve is handled using the differential gain, output valve is added with primary electric load setting value, shape
The generation load duty setting signal of Cheng Xin.
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| CN112162484B (en) * | 2020-09-24 | 2023-03-14 | 华北电力大学（保定） | Thermal power generating unit flexible coordination control method suitable for deep peak regulation operation |
| CN113391549B (en) * | 2021-05-08 | 2022-12-23 | 北京京能电力股份有限公司 | Parallel execution mechanism action amount optimal distribution method and device |
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