CN105372991B - The more coal operating modes of thermal power plant unit overcome main steam pressure undulated control method - Google Patents
The more coal operating modes of thermal power plant unit overcome main steam pressure undulated control method Download PDFInfo
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Abstract
Overcome main steam pressure undulated control method the present invention relates to a kind of more coal operating modes of thermal power plant unit, step is as follows：Increase following circuit interface in the control logic configuration of thermal power plant unit distributed monitoring control system：Overcome main steam pressure fluctuation Limestone control circuit interface, overcome main steam pressure fluctuation Primary air flow control circuit interface, overcome main steam pressure fluctuation main steam pressure set value calculation circuit interface, overcome main steam pressure fluctuation turbine high-pressure governing valve control loop interface；The more coal operating modes of thermal power plant unit are carried out in the control logic of thermal power plant unit distributed monitoring control system and overcome main steam pressure fluctuation Logical Configuration, and outputs it to be incorporated into and overcomes in main steam pressure undulated control circuit interface；Control system puts into actual motion, and according to real time execution curve, the more coal operating modes of on-line tuning thermal power plant unit overcome each control loop relevant parameter of main steam pressure fluctuation, are finally reached expected control effect.The present invention is by existing thermal power plant unit distributed monitoring control system coordinated control system, and real-time is good, and field adjustable process is simple, is easy to Project Realization.
Description
Technical field
The invention belongs to thermal power generation unit automatic control technology field, more particularly to a kind of more coals of thermal power plant unit
Operating mode overcomes main steam pressure undulated control method.Available for main steam pressure of the heat supply fired power generating unit in actual moving process
Automatically control, ensure unit while load responding fast and stable, automatically by main steam pressure control in the reasonable scope.
Background technology
Heat supply thermal power unit operation operating mode is changeable, including pure condensed steam operating mode, extraction steam for factories operating mode, heating are drawn gas operating mode, work
Industry is drawn gas draws gas while exists operating mode etc. with heating.The operation characteristic of thermal power plant unit difference operating mode is different, to automatic control system
Requirement it is different.Heat supply fired power generating unit is difficult to adhere to using design coal in actual motion, or even uses and check coal all
It can not ensure, be often to come what coal just burns what coal, more coal operating modes are come in the case of coal to produce herein.For power network
Safe and stable, economical operation and raising power quality, grid company require that online heat supply thermal power generation unit must possess
Frequency modulation peak regulating function, and propose specific technical indicator and evaluation method.Heat supply fired power generating unit coordinated control system is unit
Highest controller in control, it is responsible for coordinating steam turbine and the energy balance of boiler room controls, ensures that unit participates in power network and adjusted
The regulation quality at frequency modulation peak.Thermal power plant unit coordinates that control controlled device be multi-input multi-output system, with it is non-linear, parameter is slow
The characteristics of time-varying and large time lag are with big inertia.The changeable controlling unit of operating condition is especially embodied in, from non-heating period control
System, control to heating period, then controlled to industrial heating, whole process link is more, is brought to main steam pressure control many tired
It is difficult.
Numerous domestic scholars were carried out to the main steam pressure control relevant issues of fired power generating unit coordinated control system in recent years
Research and discussion, such as《Proceedings of the CSEE》's《Coordinated Control System Design new method and its work
Cheng Yingyong》, a kind of Practical Mathematical Model of coordinated controll plant is provided, coal-fired heat is estimated using observer
Value, a kind of feedback of status+cascade PID+intelligent control (IC) based on incremental function observation of design+calorific value compensation (BTU)
Synthesis type coordinating control system.《Power engineering journal》's《The self-adaptive prediction function control of boiler combustion system》Propose one
Kind of the self-adaptive prediction function control method based on Kalman (CARMA) model, by the parameter of real-time identification process model, no
The disconnected parameter for going to correct prediction function controller.Chinese patent " move by the coordinated control system parameter based on pre-feed coal control model
State setting method " number of patent application CN201210414078.9, it is proposed that ask for control algolithm ginseng using computer software auxiliary
Number, simplify debugging process, shorten dynamic parameter and ask for the time.Chinese patent " coordinate by the direct energy quality equilibrium of Once-through Boiler monoblock
Control system " number of patent application CN201110103988.0, propose to realize steam turbine power adjusting using direct energy blance mechanism
Dynamic decoupling between loop and boiler combustion regulating loop, steam turbine power adjusting is realized using direct quality, flow equilibrium mechanism
Dynamic decoupling between loop and boiler feedwater control loop.Chinese patent is " based on before the fired power generating unit coal amount for coordinating Control platform
Present quantification design method " number of patent application CN201210394342.7, it is proposed that the load instruction before and after rate limit is asked inclined
Difference, coal amount feedforward quantization scale is obtained by quantifying the one-dimensional polygronal function of scale, before designing different brackets load coal amount
The basic quantization scale of feedback.
The above document and the patent mainly foundation from unit mathematical modeling, the design of unit allocation strategy and control
Adjusting etc. for systematic parameter is set forth, and proposes coordinated control system design method and application example, to main steaming
Steam pressure is controlled, but overcomes main steam pressure undulated control not carry out being directed to the more coal operating modes of thermal power plant unit
The research of property.
The content of the invention
For above-mentioned problems of the prior art, the present invention provides a kind of more coal operating modes of thermal power plant unit and overcome
Main steam pressure undulated control method, its purpose is to solve the more coal operating mode main steam pressures of thermal power plant unit to control automatically
Problem processed, gives full play to equipment potential, while power grid frequency modulation peak regulation requirement is met, ensures the stability of major parameter.
The purpose of the present invention is achieved through the following technical solutions：
The more coal operating modes of thermal power plant unit overcome main steam pressure undulated control method, it is characterised in that including following step
Suddenly：
The first step：Increase following circuit interface in the control logic configuration of thermal power plant unit distributed monitoring control system：Overcome
Main steam pressure fluctuation Limestone control circuit interface, overcome main steam pressure fluctuation Primary air flow control circuit interface, overcome
Main steam pressure fluctuation main steam pressure set value calculation circuit interface, overcomes main steam pressure fluctuation turbine high-pressure governing valve control
Circuit interface processed；
Second step：Following configuration is carried out in the control logic of thermal power plant unit distributed monitoring control system：Carry out overcoming main steaming
Vapour pressure fluctuation Limestone control loop Logical Configuration, and output it to be incorporated into and overcome main steam pressure fluctuation Limestone control
Feed-forward signal in circuit interface as Limestone control, carry out overcoming main steam pressure fluctuation Primary air flow control loop logic
Configuration, and output it to be incorporated into overcome in main steam pressure fluctuation Primary air flow control circuit interface and be used as Primary air flow control
Feed-forward signal, carry out overcoming main steam pressure fluctuation main steam pressure set value calculation loop Logical Configuration, and output it
It is incorporated into overcome in main steam pressure fluctuation main steam pressure set value calculation circuit interface and becomes as main steam pressure setting value
Change rate signal, carry out overcoming main steam pressure fluctuation turbine high-pressure governing valve control loop Logical Configuration, and output it and draw
Enter to overcoming and main steam turbine high-pressure governing valve aperture control is used as in main steam pressure fluctuation turbine high-pressure governing valve control loop interface
Signal processed；
3rd step：Control system puts into actual motion, and according to real time execution curve, the more coals of on-line tuning thermal power plant unit are mixed
Burn operating mode and overcome each control loop relevant parameter of main steam pressure fluctuation, be finally reached expected control effect.
Main steam pressure fluctuation Limestone control loop is overcome to include described in the first step：According to main steam pressure state
Coal-supplying amount correction A is calculated, the coal fuel heating state of value according to start and stop coal pulverizer calculates coal-supplying amount correction B；Main steam pressure shape
State includes：Heat supply is drawn gas, and dish valve opening is constant, and generation load increase, main steam pressure actual value raises and is more than setting value, supplies
Heat dish valve opening of drawing gas is constant, and generation load increase, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas dish valve
Aperture increase, generation load is constant, and main steam pressure actual value raises and is more than setting value, and heat supply dish valve opening of drawing gas increases,
Generation load is constant, and main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas the increase of dish valve opening, generation load increasing
Add, main steam pressure actual value is raised and is more than setting value, and heat supply is drawn gas the increase of dish valve opening, and generation load increases, main steam
Pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, main steam pressure actual value
Raise and be more than setting value, heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, and main steam pressure actual value declines and is less than
Setting value, heat supply draw gas dish valve opening reduction, generation load is constant, main steam pressure actual value raise and be more than setting value, confession
Heat is drawn gas the reduction of dish valve opening, and generation load is constant, and main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas dish valve
Aperture is reduced, and generation load is reduced, and main steam pressure actual value raises and is more than setting value, and heat supply dish valve opening of drawing gas is reduced,
Generation load is reduced, and main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is not
Become, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is constant, main steam
Pressure actual value raises and is more than setting value；The variation tendency of main steam pressure state is consistent with load variations direction, then to coal
Amount correction A variable quantities are smaller, and the variation tendency of main steam pressure state and load variations direction are inconsistent, then coal-supplying amount amendment
It is larger to measure A variable quantities, after the change of steady load operating mode main steam pressure, then coal-supplying amount correction A is pulse signal；Start and stop coal-grinding
The coal fuel heating state of value of machine includes：The coal-fired calorific value of start and stop coal pulverizer is different different with main steam pressure variable condition, then to coal
Correction B numerical value difference is measured, starts the coal-fired calorific value height of coal pulverizer, and main steam pressure rise is very fast, then coal-supplying amount amendment
Measure B and reduce very fast, it is low to start the coal-fired calorific value of coal pulverizer, and main steam pressure rise is slower, then coal-supplying amount correction B reduce compared with
Slowly, it is high to stop the coal-fired calorific value of coal pulverizer, and main steam pressure reduces comparatively fast, then coal-supplying amount correction B increases are very fast, stop mill
The coal-fired calorific value of coal machine is low, and main steam pressure reduction is slower, then coal-supplying amount correction B increases are slower.
Main steam pressure fluctuation Primary air flow control loop is overcome to include described in the first step：According to main steam pressure shape
State calculates primary air flow correction A, and the coal fuel heating state of value according to start and stop coal pulverizer calculates primary air flow correction B.
The variation tendency of described main steam pressure state is consistent with load variations direction, then primary air flow correction A becomes
Change amount is smaller, and the variation tendency of main steam pressure state and load variations direction are inconsistent, then primary air flow correction A variable quantities
Larger, after the change of steady load operating mode main steam pressure, then primary air flow correction A is pulse signal；The combustion of start and stop coal pulverizer
Coal calorific value state includes：The coal-fired calorific value of start and stop coal pulverizer is different different with main steam pressure variable condition, then primary air flow is repaiied
Positive quantity B numerical value is different, starts the coal-fired calorific value height of coal pulverizer, and main steam pressure rise is very fast, then primary air flow correction B
Reduce very fast, it is low to start the coal-fired calorific value of coal pulverizer, and main steam pressure rise is slower, then primary air flow correction B reduce compared with
Slowly, it is high to stop the coal-fired calorific value of coal pulverizer, and main steam pressure reduces comparatively fast, then primary air flow correction B increases are very fast, stop
The coal-fired calorific value of coal pulverizer is low, and main steam pressure reduction is slower, then primary air flow correction B increases are slower.
Overcome main steam pressure fluctuation main steam pressure set value calculation loop described in the first step, be by main steam pressure
Power desired value and main steam pressure set point change speed composition, main steam pressure desired value are taken out by generation load instruction and heat supply
Vapour dish valve opening is collectively forming, and main steam pressure set point change speed is by main steam pressure state dynamic formation, main steam pressure
The variation tendency of power state is consistent with load variations direction, then speed increases automatically, the variation tendency of main steam pressure state with
Load variations direction is inconsistent, then speed reduces automatically.
Overcome main steam pressure fluctuation turbine high-pressure governing valve control loop described in the first step, be by main steam pressure
Actual value forms the revision directive of turbine high-pressure governing valve aperture by polygronal function, when main steam pressure exceedes design load,
Automatic increase turbine high-pressure governing valve aperture, maintains main steam pressure stable.
Advantages of the present invention and beneficial effect are：
(1) it is accurate to control unit lifting load by the judgement to thermal power plant unit operating condition and main steam pressure state
During coal-supplying amount and primary air flow, coal-supplying amount and primary air flow during start and stop coal pulverizer, steady load state gives
Coal amount and primary air flow, ensure coordination control stability and accuracy of the unit when participating in frequency modulation peak regulation, so as to realize fully
Equipment potential is played, while power grid frequency modulation peak regulation requirement is met, ensures the stabilization of unit Heating quality and main steam pressure
Property.
(2) by the judgement to thermal power plant unit operating condition, main steam pressure mesh during unit difference operating condition is controlled
The rate of change of scale value and main steam pressure desired value, ensure that thermal power plant unit main steam pressure control under different operating conditions is steady
Qualitative and accuracy.
(3) by the judgement to thermal power plant unit main steam pressure, when main steam pressure exceedes design load, unit vapour is controlled
Turbine high-pressure governing valve aperture, ensure thermal power plant unit main steam pressure control stability under different operating conditions.
(4) labor intensity of operations staff, and technical merit of the control effect independent of operations staff can effectively be reduced.
(5) real-time is good, and field adjustable process is simple, is easy to Project Realization.
Brief description of the drawings：
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 is inventive algorithm coal-supplying amount and primary air flow correction logic chart；
Fig. 2 is the workflow block diagram of the present invention.
In figure：Coal-supplying amount correction A, coal-supplying amount correction B, primary air flow correction A, primary air flow correction B.
Embodiment
The present invention is that a kind of more coal operating modes of thermal power plant unit overcome main steam pressure undulated control method, such as Fig. 2 institutes
Show, comprise the following steps：
The first step：Increase following circuit interface in the control logic configuration of thermal power plant unit distributed monitoring control system：Overcome
Main steam pressure fluctuation Limestone control circuit interface, overcome main steam pressure fluctuation Primary air flow control circuit interface, overcome
Main steam pressure fluctuation main steam pressure set value calculation circuit interface, overcomes main steam pressure fluctuation turbine high-pressure governing valve control
Circuit interface processed；
Second step：Following configuration is carried out in the control logic of thermal power plant unit distributed monitoring control system：Carry out overcoming main steaming
Vapour pressure fluctuation Limestone control loop Logical Configuration, and output it to be incorporated into and overcome main steam pressure fluctuation Limestone control
Feed-forward signal in circuit interface as Limestone control, carry out overcoming main steam pressure fluctuation Primary air flow control loop logic
Configuration, and output it to be incorporated into overcome in main steam pressure fluctuation Primary air flow control circuit interface and be used as Primary air flow control
Feed-forward signal, carry out overcoming main steam pressure fluctuation main steam pressure set value calculation loop Logical Configuration, and output it
It is incorporated into overcome in main steam pressure fluctuation main steam pressure set value calculation circuit interface and becomes as main steam pressure setting value
Change rate signal, carry out overcoming main steam pressure fluctuation turbine high-pressure governing valve control loop Logical Configuration, and output it and draw
Enter to overcoming and main steam turbine high-pressure governing valve aperture control is used as in main steam pressure fluctuation turbine high-pressure governing valve control loop interface
Signal processed；
3rd step：Control system puts into actual motion, and according to real time execution curve, the more coals of on-line tuning thermal power plant unit are mixed
Burn operating mode and overcome each control loop relevant parameter of main steam pressure fluctuation, be finally reached expected control effect.
The more coal operating modes of thermal power plant unit described in the first step overcome main steam pressure undulated control method, its feature
It is：Described overcomes main steam pressure fluctuation Limestone control loop to include：According to main steam pressure state computation coal-supplying amount
Correction A, the coal fuel heating state of value according to start and stop coal pulverizer calculate coal-supplying amount correction B；Main steam pressure state includes：Heat supply
Dish valve opening of drawing gas is constant, and generation load increase, main steam pressure actual value raises and is more than setting value, and the heat supply dish valve that draws gas is opened
Spend constant, generation load increase, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas the increase of dish valve opening, is sent out
Electric load is constant, and main steam pressure actual value raises and is more than setting value, and heat supply dish valve opening of drawing gas increases, and generation load is not
Become, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas the increase of dish valve opening, and generation load increases, main steam
Pressure actual value is raised and is more than setting value, and heat supply is drawn gas the increase of dish valve opening, and generation load increases, main steam pressure actual value
Decline and be less than setting value, heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, and main steam pressure actual value is raised and is more than
Setting value, heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, and main steam pressure actual value declines and is less than setting value, supplies
Heat is drawn gas the reduction of dish valve opening, and generation load is constant, and main steam pressure actual value raises and is more than setting value, and heat supply is drawn gas dish valve
Aperture is reduced, and generation load is constant, and main steam pressure actual value declines and is less than setting value, and heat supply dish valve opening of drawing gas is reduced,
Generation load is reduced, and main steam pressure actual value raises and is more than setting value, and heat supply dish valve opening of drawing gas is reduced, and generation load subtracts
Few, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is constant, main steam
Pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is constant, main steam pressure actual value
Raise and be more than setting value；The variation tendency of main steam pressure state is consistent with load variations direction, then coal-supplying amount correction A becomes
Change amount is smaller, and the variation tendency of main steam pressure state and load variations direction are inconsistent, then coal-supplying amount correction A variable quantities compared with
Greatly, after the change of steady load operating mode main steam pressure, then coal-supplying amount correction A is pulse signal；The coal fuel heating of start and stop coal pulverizer
State of value includes：The coal-fired calorific value of start and stop coal pulverizer is different different with main steam pressure variable condition, then coal-supplying amount correction B
Numerical value is different, starts the coal-fired calorific value height of coal pulverizer, and main steam pressure rise is very fast, then coal-supplying amount correction B is reduced very fast,
It is low to start the coal-fired calorific value of coal pulverizer, and main steam pressure rise is slower, then coal-supplying amount correction B is reduced slower, stops coal-grinding
The coal-fired calorific value of machine is high, and main steam pressure reduces comparatively fast, then coal-supplying amount correction B increases are very fast, stop the fire coal of coal pulverizer
Calorific value is low, and main steam pressure reduction is slower, then coal-supplying amount correction 2 increases slower.
The more coal operating modes of thermal power plant unit described in the first step overcome main steam pressure undulated control method, its feature
It is：Described overcomes main steam pressure fluctuation Primary air flow control loop to include：According to main steam pressure state computation once
Air quantity correction A, the coal fuel heating state of value according to start and stop coal pulverizer calculate primary air flow correction B.Main steam pressure state
Variation tendency is consistent with load variations direction, then primary air flow correction A variable quantities are smaller, and the change of main steam pressure state becomes
Gesture and load variations direction are inconsistent, then primary air flow correction A variable quantities are larger, the change of steady load operating mode main steam pressure
Afterwards, then primary air flow correction A is pulse signal；The coal fuel heating state of value of start and stop coal pulverizer includes：The fire coal of start and stop coal pulverizer
Calorific value is different different with main steam pressure variable condition, then primary air flow correction B numerical value is different, starts the fire coal of coal pulverizer
Calorific value is high, and main steam pressure rise is very fast, then primary air flow correction B is reduced very fast, and it is low to start the coal-fired calorific value of coal pulverizer,
And main steam pressure rise is slower, then primary air flow correction B is reduced slower, stops the coal-fired calorific value height of coal pulverizer, and main steaming
Steam pressure reduces very fast, then primary air flow correction B increases are very fast, and it is low to stop the coal-fired calorific value of coal pulverizer, and main steam pressure
Reduction is slower, then primary air flow correction B increases are slower.
The more coal operating modes of thermal power plant unit described in the first step overcome main steam pressure undulated control method, its feature
It is：Described overcomes main steam pressure fluctuation main steam pressure set value calculation loop, be by main steam pressure desired value and
Main steam pressure set point change speed forms, dish valve opening that main steam pressure desired value is instructed by generation load and heat supply is drawn gas
It is collectively forming, main steam pressure set point change speed is by main steam pressure state dynamic formation, the change of main steam pressure state
Change trend is consistent with load variations direction, then speed increases automatically, variation tendency and the load variations side of main steam pressure state
To inconsistent, then speed reduces automatically.
The more coal operating modes of thermal power plant unit described in the first step overcome main steam pressure undulated control method, its feature
It is：Described overcomes main steam pressure fluctuation turbine high-pressure governing valve control loop, is passed through by main steam pressure actual value
Polygronal function forms the revision directive of turbine high-pressure governing valve aperture, when main steam pressure exceedes design load, increases vapour automatically
Turbine high-pressure governing valve aperture, maintain main steam pressure stable.
The core concept of the present invention is that running status is complicated and changeable in the process of running for heat supply fired power generating unit, only by right
The judgement of operating states of the units, the accurate coal-supplying amount controlled during unit difference running status, primary air flow, main steam pressure are set
Value, turbine high-pressure governing valve aperture, just can guarantee that unit while load responding rapidity, reduces the ripple of main steam pressure
It is dynamic.
Coal-supplying amount and primary air flow algorithm logic figure in the present invention, the i.e. more coal operating modes of thermal power plant unit overcome main steam
The coal-supplying amount and primary air flow logic of pressure oscillation control method are as shown in Figure 1.In Fig. 1, heat supply is drawn gas load, generation load,
Load deviation, coal pulverizer fuel value directly can be read from thermal power plant unit distributed monitoring control system real-time data base.Switching
Main steam pressure control pulse during condition steady load, main steam pressure change is consistent with load variations direction, starts coal pulverizer,
Stop coal pulverizer, drawn by logic judgment, steady load and main steam pressure deviation starts timing more than setting, after the time arrives
Pulse signal is sent, then rejudges timing, heat supply is drawn gas the increase of dish valve opening, or generation load increase, main steam pressure are real
Actual value raises and is more than setting value, then it is assumed that main steam pressure change is consistent with load variations direction, by monitoring that coal pulverizer is transported
Capable quantity judges that starting coal pulverizer is also off coal pulverizer, and the quantity increase of coal pulverizer operation is then startup coal pulverizer, coal-grinding
The quantity of machine operation is reduced then as stopping coal pulverizer.f1(x) be non-linear function generator, its input for heat supply draw gas load with
Generation load sum, export for steady load when main steam pressure control pulse coal-supplying amount correction, f2(x) it is nonlinear function
Generator, its input is load deviation, exports and changes coal-supplying amount correction consistent with load variations direction for main steam pressure.
f3(x) it is non-linear function generator, its input is load deviation, exports and becomes for main steam pressure change with load
Change the inconsistent coal-supplying amount correction in direction.f4(x) it is non-linear function generator, its input is start and stop coal pulverizer fuel value,
Export to start coal pulverizer coal-supplying amount correction.f5(x) it is non-linear function generator, its input is start and stop coal pulverizer fuel heat
Value, export to stop coal pulverizer coal-supplying amount correction.f6(x) it is non-linear function generator, its input is coal-supplying amount correction
A, export as primary air flow correction A.f7(x) it is non-linear function generator, its input is coal-supplying amount correction B, exports and is
Primary air flow correction B.f1(x)、f2(x)、f3(x)、f4(x)、f5(x)、f6(x)、f7(x) parameter can exist according to real-time curve
Line is adjusted, and the principle adjusted is by existing thermal power plant unit distributed monitoring control system coordinated control system, ensures unit in frequency modulation
While peak regulation response quickly is stable, automatically by main main steam pressure control in the reasonable scope.
Below by taking the overcritical heat supply fired power generating units of certain 350MW as an example, introduce algorithm parameter and adjust result, as shown in table 1.
Unit overview：The unit boiler is Terms of Corner Tangential Combustion, steam turbine be 350MW it is overcritical, once among again
Heat, single shaft condensing turbine.Pulverized coal preparation system is direct-firing using malleation, equipped with 5 coal pulverizers；One provided with two 50% capacity
Secondary blower fan provides once heat, cold wind pulverized coal conveying.Control system is coordinated using the control system of Beijing Guo electricity Zhi Shen companies
Control system uses the coordinated control system based on boiler follow, and Fuel- Water Rate control is using water with coal mode.
As shown in table 1, table 1 is that the more coal operating modes of thermal power plant unit overcome main steam pressure fluctuation coal-supplying amount and First air
Amount control parameter is adjusted.
In table 1 with f1(x) x corresponding to is that heat supply is drawn gas load and generation load sum (MW)；With f2(x) x corresponding to is negative
Lotus deviation (MW)；With f3(x) x corresponding to is load deviation (MW)；With f4(x) x corresponding to is start and stop coal pulverizer fuel value
(kcal)；With f5(x) x corresponding to is start and stop coal pulverizer fuel value (kcal)；With f6(x) x corresponding to is coal-supplying amount correction A
(t/h)；With f7(x) x corresponding to is coal-supplying amount correction B (t/h)；Draw gas load, generation load, load of the heat supply of the unit is inclined
Difference, coal pulverizer fuel value directly can be read from thermal power plant unit distributed monitoring control system real-time data base；Complete heat supply machine
The more coal operating modes of group overcome main steam pressure undulated control loop Logical Configuration, and output it that to be incorporated into thermal power plant unit more
Coal operating mode is overcome in main steam pressure undulated control circuit interface, system is put into actual motion, according to unit operation
Curve, repeatedly on-line tuning f1(x)、f2(x)、f3(x)、f4(x)、f5(x)、f6(x)、f7(x), relevant parameter, ensure that unit exists
While load responding fast and stable, automatically by main steam pressure control in the reasonable scope；Field adjustable process is simple, is easy to
Project Realization.
The more coal operating modes of the thermal power plant unit of table 1 overcome main steam pressure fluctuation coal-supplying amount and Primary air flow control parameter whole
It is fixed.
Claims (8)
1. the more coal operating modes of thermal power plant unit overcome main steam pressure undulated control method, it is characterised in that including following step
Suddenly：
The first step：Increase following circuit interface in the control logic configuration of thermal power plant unit distributed monitoring control system：Overcome main steaming
Vapour pressure fluctuation Limestone control circuit interface, overcome main steam pressure fluctuation Primary air flow control circuit interface, overcome main steaming
Vapour pressure fluctuation main steam pressure set value calculation circuit interface, overcomes main steam pressure fluctuation turbine high-pressure governing valve to control back
Road interface；
Second step：Following configuration is carried out in the control logic of thermal power plant unit distributed monitoring control system：Carry out overcoming main steam pressure
Fluctuation Limestone control loop Logical Configuration, and output it to be incorporated into and overcome main steam pressure fluctuation Limestone control loop
Feed-forward signal in interface as Limestone control, carry out overcoming main steam pressure fluctuation Primary air flow control loop logical groups
State, and output it to be incorporated into and overcome in main steam pressure fluctuation Primary air flow control circuit interface as Primary air flow control
Feed-forward signal, carry out overcoming main steam pressure fluctuation main steam pressure set value calculation loop Logical Configuration, and output it and draw
Enter to overcoming in main steam pressure fluctuation main steam pressure set value calculation circuit interface and be used as main steam pressure set point change
Rate signal, carry out overcoming main steam pressure fluctuation turbine high-pressure governing valve control loop Logical Configuration, and output it introducing
Controlled to overcoming in main steam pressure fluctuation turbine high-pressure governing valve control loop interface as main steam turbine high-pressure governing valve aperture
Signal；
3rd step：Control system puts into actual motion, according to real time execution curve, the more coal works of on-line tuning thermal power plant unit
Condition overcomes each control loop relevant parameter of main steam pressure fluctuation, is finally reached expected control effect.
2. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：In the described first step, main steam pressure fluctuation Limestone control loop is overcome to include：According to main steam pressure shape
State calculates coal-supplying amount correction A, and the coal fuel heating state of value according to start and stop coal pulverizer calculates coal-supplying amount correction B；Main steam pressure
State includes：Heat supply is drawn gas, and dish valve opening is constant, and generation load increase, main steam pressure actual value raises and is more than setting value,
Heat supply dish valve opening of drawing gas is constant, and generation load increase, main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas dish
Valve opening increase, generation load is constant, and main steam pressure actual value raises and is more than setting value, and heat supply dish valve opening of drawing gas increases
Add, generation load is constant, and main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas the increase of dish valve opening, is generated electricity and is born
Lotus increases, and main steam pressure actual value raises and is more than setting value, and heat supply is drawn gas the increase of dish valve opening, generation load increase, master
Steam pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, and main steam pressure is real
Actual value raises and is more than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is reduced, the decline of main steam pressure actual value and
Less than setting value, heat supply draw gas dish valve opening reduction, generation load is constant, main steam pressure actual value rise and more than setting
Value, heat supply draw gas dish valve opening reduction, generation load is constant, main steam pressure actual value decline and be less than setting value, heat supply is taken out
Vapour dish valve opening is reduced, and generation load is reduced, and main steam pressure actual value raises and is more than setting value, and heat supply is drawn gas dish valve opening
Reduce, generation load is reduced, and main steam pressure actual value declines and is less than setting value, and heat supply dish valve opening of drawing gas is constant, generating
Load is constant, and main steam pressure actual value declines and is less than setting value, and heat supply is drawn gas, and dish valve opening is constant, and generation load is constant,
Main steam pressure actual value raises and is more than setting value；The variation tendency of main steam pressure state is consistent with load variations direction,
Then coal-supplying amount correction A variable quantities are smaller, and the variation tendency of main steam pressure state and load variations direction are inconsistent, then to coal
It is larger to measure correction A variable quantities, after the change of steady load operating mode main steam pressure, then coal-supplying amount correction A is pulse signal；Open
Stopping the coal fuel heating state of value of coal pulverizer includes：The coal-fired calorific value of start and stop coal pulverizer is different different with main steam pressure variable condition,
Then coal-supplying amount correction B numerical value is different, starts the coal-fired calorific value height of coal pulverizer, and main steam pressure rise is very fast, then to coal
Measure correction B and reduce very fast, it is low to start the coal-fired calorific value of coal pulverizer, and main steam pressure rise is slower, then coal-supplying amount correction B
Reduction is slower, stops the coal-fired calorific value height of coal pulverizer, and main steam pressure reduces comparatively fast, then coal-supplying amount correction B increases comparatively fast,
It is low to stop the coal-fired calorific value of coal pulverizer, and main steam pressure reduction is slower, then coal-supplying amount correction B increases are slower.
3. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：In the described first step, main steam pressure fluctuation Primary air flow control loop is overcome to include：According to main steam pressure
State computation primary air flow correction A, the coal fuel heating state of value according to start and stop coal pulverizer calculate primary air flow correction B.
4. the more coal operating modes of thermal power plant unit according to claim 2 overcome main steam pressure undulated control method, its
It is characterised by：The variation tendency of described main steam pressure state is consistent with load variations direction, then primary air flow correction A becomes
Change amount is smaller, and the variation tendency of main steam pressure state and load variations direction are inconsistent, then primary air flow correction A variable quantities
Larger, after the change of steady load operating mode main steam pressure, then primary air flow correction A is pulse signal；The combustion of start and stop coal pulverizer
Coal calorific value state includes：The coal-fired calorific value of start and stop coal pulverizer is different different with main steam pressure variable condition, then primary air flow is repaiied
Positive quantity B numerical value is different, starts the coal-fired calorific value height of coal pulverizer, and main steam pressure rise is very fast, then primary air flow correction B
Reduce very fast, it is low to start the coal-fired calorific value of coal pulverizer, and main steam pressure rise is slower, then primary air flow correction B reduce compared with
Slowly, it is high to stop the coal-fired calorific value of coal pulverizer, and main steam pressure reduces comparatively fast, then primary air flow correction B increases are very fast, stop
The coal-fired calorific value of coal pulverizer is low, and main steam pressure reduction is slower, then primary air flow correction B increases are slower.
5. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：In the described first step, overcome main steam pressure fluctuation main steam pressure set value calculation loop, be by main steam
Pressure target value and main steam pressure set point change speed composition, main steam pressure desired value is instructed by generation load and heat supply
Dish valve opening of drawing gas is collectively forming, and main steam pressure set point change speed is by main steam pressure state dynamic formation, main steam
The variation tendency of pressure state is consistent with load variations direction, then speed increases automatically, the variation tendency of main steam pressure state
Inconsistent with load variations direction, then speed reduces automatically.
6. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：In the described first step, overcome main steam pressure fluctuation turbine high-pressure governing valve control loop, be by main steam pressure
Power actual value forms the revision directive of turbine high-pressure governing valve aperture by polygronal function, when main steam pressure exceedes design load
When, it is automatic to increase turbine high-pressure governing valve aperture, maintain main steam pressure stable.
7. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：Described coal-supplying amount and primary air flow, its algorithm logic are：Heat supply is drawn gas load, generation load, load deviation,
Coal pulverizer fuel value directly can be read from thermal power plant unit distributed monitoring control system real-time data base；Switching condition load
Main steam pressure control pulse when stable, main steam pressure change is consistent with load variations direction, starts coal pulverizer, stops coal-grinding
Machine, drawn by logic judgment, steady load and main steam pressure deviation starts timing more than setting, the time sends pulse after
Signal, then rejudge timing, heat supply are drawn gas the increase of dish valve opening, or generation load increase, the rise of main steam pressure actual value
And it is more than setting value, then it is assumed that main steam pressure change is consistent with load variations direction, the quantity run by monitoring coal pulverizer
Judge that starting coal pulverizer is also off coal pulverizer, the quantity increase of coal pulverizer operation is then startup coal pulverizer, coal pulverizer operation
Quantity is reduced then as stopping coal pulverizer；f1(x) it is non-linear function generator, it is inputted draws gas load and generation load for heat supply
Sum, export for steady load when main steam pressure control pulse coal-supplying amount correction；f2(x) it is non-linear function generator,
Its input is load deviation, exports and changes coal-supplying amount correction consistent with load variations direction for main steam pressure；f3(x) to be non-
Linear function generator, its input is load deviation, export for main steam pressure change with load variations direction it is inconsistent to coal
Measure correction；f4(x) it is non-linear function generator, its input is start and stop coal pulverizer fuel value, is exported to start coal pulverizer
Coal-supplying amount correction；f5(x) it is non-linear function generator, its input is start and stop coal pulverizer fuel value, is exported to stop grinding
Coal machine coal-supplying amount correction；f6(x) it is non-linear function generator, its input is coal-supplying amount correction A, is exported as primary air flow
Correction A；f7(x) it is non-linear function generator, its input is coal-supplying amount correction B, is exported as primary air flow correction B；f1
(x)、f2(x)、f3(x)、f4(x)、f5(x)、f6(x)、f7(x) parameter can be according to real-time curve on-line tuning, the principle adjusted
It is by existing thermal power plant unit distributed monitoring control system coordinated control system, ensures that unit is stable in frequency modulation peak regulation response quickly
While, automatically by main main steam pressure control in the reasonable scope.
8. the more coal operating modes of thermal power plant unit according to claim 1 overcome main steam pressure undulated control method, its
It is characterised by：Described coal-supplying amount and the algorithm logic of primary air flow are：The algorithm parameter of the overcritical heat supply fired power generating units of 350MW
It is as follows to adjust result：
Unit overview：The unit boiler is Terms of Corner Tangential Combustion, and steam turbine is that 350MW is overcritical, resuperheat, a list
Axle condensing turbine；Pulverized coal preparation system is direct-firing using malleation, equipped with 5 coal pulverizers；Primary air fan provided with two 50% capacity
Once heat, cold wind pulverized coal conveying are provided；Coordinated control system uses the coordinated control system based on boiler follow, Fuel- Water Rate
Control is using water with coal mode；
The more coal operating modes of thermal power plant unit overcome main steam pressure fluctuation coal-supplying amount and the Primary air flow control parameter tuning to be：
With f1(x) x corresponding to is that heat supply is drawn gas load and generation load sum（MW）；With f2(x) x corresponding to is load deviation
（MW）；With f3(x) x corresponding to is load deviation（MW）；With f4(x) x corresponding to is start and stop coal pulverizer fuel value（kcal）；With
f5(x) x corresponding to is start and stop coal pulverizer fuel value（kcal）；With f6(x) x corresponding to is coal-supplying amount correction A（t/h）；With f7
(x) x corresponding to is coal-supplying amount correction B（t/h）；The heat supply of the unit is drawn gas load, generation load, load deviation, coal pulverizer
Fuel value directly can be read from thermal power plant unit distributed monitoring control system real-time data base；Complete the more coals of thermal power plant unit
Multifuel combustion operating mode overcomes main steam pressure undulated control loop Logical Configuration, and outputs it and be incorporated into the more coals of thermal power plant unit
Operating mode is overcome in main steam pressure undulated control circuit interface, and system is put into actual motion, according to unit operation curve, repeatedly
On-line tuning f1(x)、f2(x)、f3(x)、f4(x)、f5(x)、f6(x)、f7(x) relevant parameter, ensure unit in load responding
While fast and stable, automatically by main steam pressure control in the reasonable scope.
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Application publication date: 20160302 Assignee: Liaoning Huadian Xinyuan Power Technology Co.,Ltd. Assignor: State Grid Liaoning Electric Power Co., Ltd. Electric Power Research Institute Contract record no.: X2021980001515 Denomination of invention: Control method for overcoming main steam pressure fluctuation under multi coal mixed combustion condition of heat supply unit Granted publication date: 20180406 License type: Common License Record date: 20210309 Application publication date: 20160302 Assignee: Liaoning Quanan Electric Power Technology Co.,Ltd. Assignor: State Grid Liaoning Electric Power Co., Ltd. Electric Power Research Institute Contract record no.: X2021210000010 Denomination of invention: Control method for overcoming main steam pressure fluctuation under multi coal mixed combustion condition of heat supply unit Granted publication date: 20180406 License type: Common License Record date: 20210309 |
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