CN103185333B - A kind of Supercritical once-through boiler coal varitation control method for coordinating - Google Patents
A kind of Supercritical once-through boiler coal varitation control method for coordinating Download PDFInfo
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Abstract
The invention discloses a kind of Supercritical once-through boiler coal varitation control method for coordinating; build the boiler master of indirect energy balance: determine coal amount with load, determine primary air flow with coal amount; establish the leading position of boiler master instruction; uniting and adjustment wind, water, coal are than ensureing that the degree of superheat of boiler meets the requirements; guarantee the control accuracy of pressure before unit machine simultaneously, and then the amplitude meeting change meeting electrical network demand met and speed.What the present invention mainly solved is that machine is fast, the slow problem of stove, builds the dynamic corrections of novel static state feedforward, the feedforward of load dynamic Feedforward, Pressure behaviour and above-mentioned feedforward based on coal varitation; The responding ability of boiler is accelerated in the interlock of wind, water, coal; Water, coal uniting and adjustment solve the problem of coal varitation, realize water, coal solution lotus root, the solution lotus root of main vapour pressure and the degree of superheat; The linear each experience curve of coefficient correction in real time; VARIABLE PARAMETER PID CONTROL is carried out to boiler master main vapour pressure adjuster.
Description
Technical field
The invention belongs to coal electro-technical field, particularly relate to a kind of ultra supercritical direct current cooker unit coal varitation control method for coordinating.
Background technology
Our country causes coal varitation very large due to coal for power generation because of economic interests at present, according to design coal coal, can not have bituminous and anthracite multifuel combustion, even arrive the stage having coal just good.And the performance assessment criteria of China's electrical network to online unit is the response amplitude of network load and speed and Primary frequency control ability, thus unit cooperative control mode mainly adopts the cooperation control based on boiler follow, i.e. pressure before boiler implosion machine, steam turbine controls the load of unit by pitch.Now along with the development of power technology, our country in order to energy-saving and emission-reduction, with large for little a large amount of direct current cooker building ultra supercritical.Extra-supercritical unit all adopts unit pulverized-coal system, much slower than middle storage formula of unit pulverized-coal system.Direct current cooker, owing to not having drum, needs to maintain certain degree of superheat, so just there is the problem intercoupled of the degree of superheat and main vapour pressure, be embodied in the problem that intercouples of water and coal when hot.Theoretical analysis and test all proves that water causes boiler pressure to respond slowly with being coupled of coal, main steam pressure difference exceeds standard, final presentation is " the fast stove of machine is slow ", whole unit can not meet the requirement of the control accuracy of network load, the security of unit boiler can not be ensured again, injure the safe operation of generating set.
Cooperation control under the Coordinated Control Scheme that present supercritical unit adopts many employings TF, namely steam turbine pitch regulates pressure, boiler regulating power, this method serves absolute control ability to main vapour pressure, but boiler then can not meet the requirement of electrical network to the adjustment of power, the effect of primary frequency modulation is subject to larger restriction.
And the standard of the electrical network examination of China is under AGC, the variation speed of unit is 2% i.e. 2%Pe/min of unit rated power, its amplitude of fluctuation is the 10%Pe of unit rated power, the Coordinated Control Scheme of such employing TFCCS can not meet the scheduling requirement of electrical network far away, in order to the scheduling requirement meeting electrical network must adopt BFCCS, i.e. steam turbine regulating power, boiler regulates pressure.
The problem of present unit ubiquity " the fast stove of machine is slow ", the action of boiler is much slower than the demand of steam turbine.The change of especially present coal-fired ature of coal is in changing frequently immediately, and its degree of superheat is greatly affected, and the problem of coal varitation is not solved effectively and timely, brings very large potential safety hazard to power plant, electrical network.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of ultra supercritical direct current cooker unit coal varitation control method for coordinating, and be intended to the problem solving present unit ubiquity " the fast stove of machine is slow ", the action of boiler is much slower than the demand of steam turbine; The change of especially present coal-fired ature of coal is in changing frequently immediately, and its degree of superheat is greatly affected, and the problem of coal varitation is not solved effectively and timely, brings the problem of very large potential safety hazard to power plant, electrical network.
The embodiment of the present invention realizes like this, a kind of ultra supercritical direct current cooker unit coal varitation control method for coordinating, build the boiler master of indirect energy balance: realize determining coal amount with load by polygronal function, the proportionate relationship of load and coal amount is 2: 1, determines primary air flow with coal amount, the proportionate relationship of coal amount and primary air flow is 1: 2, determines secondary air flow with coal amount, the proportionate relationship of coal amount and secondary air flow is 1: 2.5, determines feedwater flow with coal amount, and the proportionate relationship of coal amount and feedwater flow is 1: 3.5; Establish the leading position of boiler master instruction, uniting and adjustment wind, water, coal, than ensureing that the degree of superheat of boiler meets the requirements, guarantee the control accuracy of pressure before unit machine simultaneously, and then the amplitude meeting change meeting electrical network demand met and speed;
Boiler master is feedovered by static state and dynamic Feedforward is formed;
1) formation of static feedforward: be basic Changing load-acceleration (its 2% the Changing load-acceleration of unit as 600MW is 12MW/min) by 2% of the rated power to this unit with target load, through judging the differentiation of unit load up, load down two kinds of varying load conditions, distinguish and carry out amplification process in different load sections, be the base load speed of 2 times when load up, it is the basic Changing load-acceleration of 4 times when load down, reach the object prior to load action, what overcome boiler delays with delayed; Consider the change of ature of coal simultaneously, degree of superheat adjuster uniting and adjustment water, coal, adjustment water coal ratio, when the degree of superheat is higher, the coefficient that degree of superheat adjuster exports increases, increase the instruction of feedwater, the output of degree of superheat adjuster simultaneously oppositely revises coal supply instruction (0.5: 1.5 ~ 1.5: 0.5) by polygronal function, when coal instruction has changed its primary air flow and secondary air flow then respective change adjustment, therefore along with the change of ature of coal, electricity, coal change than also, and the output of degree of superheat adjuster oppositely revises electric coal experience curve by polygronal function;
2) speed-raising of load dynamic Feedforward and the correction of value: the differential of the load change amplitude of the difference of target load and unit load instruction, (time of varying duty depends on the amplitude of varying duty and the speed of actual varying duty for the time of formation varying duty and the basic reference point of value, the basic reference point of varying duty value is the amplitude limit of the output valve after differential, generally be decided to be between+5 ~-5), distinguish between different loading zones, different lifting load operating modes forms different, it is the basic value of 2 times when load up, it is the basic value of 4 times when load down, thus form different dynamic Feedforward, form load dynamic Feedforward truly, guarantee the demand of the various operating mode of AGC, meet various index,
3) speed-raising of main vapour pressure variable-pressure operation dynamic Feedforward and the correction of value: in the process of varying duty, under unit adopts variable-pressure operation mode, carry out the change of two kinds and load variations is given and main vapour pressure change is given in the load section of below 90%Pe simultaneously, and variable-pressure operation is still being carried out after load variations terminates, when there is no varying duty, operations staff revises the biased existence still having variable-pressure operation, therefore the method with reference to varying duty builds boiler master transformation dynamic Feedforward, thus forms the double feed forward of transformation and varying duty;
4) formation of main vapour pressure instruction: general unit master control main vapour pressure instruction is that load instruction polygronal function forms the set-point determining the fixed main vapour pressure of cunning, the rate limit then through operations staff's setting forms main vapour pressure instruction; For the characteristic of supercritical DC furnace, the inertia time that after pressure set points before machine after pressure curve, increase by three joint inertial elements often save is 60 seconds, thus reach the regulatory function that the dynamic Feedforward strengthening load when varying loading weakens adjuster, meet the intervention of the pressure setting of operations staff simultaneously;
5) formation of boiler master pressure controller variable element: certain scope is exceeded for the main vapour pressure deviation different in different load sections and weakens integral action strengthening ratio and differential can effectively regulate main vapour pressure to avoid concussion and the toning of main vapour pressure;
6) responding ability of wind, water, coal interlock quickening boiler is built: boiler master instruction goes out primary air flow instruction, secondary air flow instruction and feedwater instruction by polygronal function correspondence, boiler instruction changes, corresponding primary air flow, secondary air flow and feedwater flow, coal-supplying amount all correspondingly change, form wind, water, coal uniting and adjustment, accelerate the response speed of boiler, overcome boiler low-response; Retain in the mill thorax running coal pulverizer and certain store powder, the increase and decrease of boiler load instruction, primary air flow also will synchronously increase and decrease, along with opening of coal pulverizer hot air disperser turns down greatly; When boiler master instruction increases, the heat primary air amount of primary air flow and mill increases, and mill thorax stores a pruinescence blowout part in burner hearth, and the coal dust flow velocity in tube cell is accelerated; When boiler master instruction reduces, the heat primary air amount of primary air flow and mill reduces, and mill thorax stores falling sharply of pruinescence blowout and is accumulated in mill thorax, and in tube cell, the flow velocity of coal dust slows down, thus the powder process reducing pulverized coal preparation system is delayed, and improves the responding ability of boiler heat load; When boiler starts application of load, the feed-forward signal of coal pulverizer hot blast adjustment door increases, and opens hot blast adjustment door, surplus powder in blowout coal pulverizer, and directly increase the coal dust amount into people's burner hearth, the powder process reducing pulverized coal preparation system is delayed; The hot cold-air flap with coal pulverizer of exerting oneself of primary air fan one in front and one in back cooperatively interacts and solves the responding ability of boiler, can solve again the stable of the outlet temperature of coal pulverizer;
7) water coal uniting and adjustment reply coal varitation: implement the uniting and adjustment of water coal, when the higher increase feedwater flow of the degree of superheat, cooling overtemperature, the output of degree of superheat adjuster simultaneously oppositely reduces the flow of coal supply; When degree of superheat minimizing feedwater flow on the low side, heated temperature temperature, the output of degree of superheat adjuster simultaneously oppositely increases the flow of coal supply, guarantees the stable of the degree of superheat maintaining boiler when coal varitation.
Further, described water coal uniting and adjustment reply coal varitation: implement the uniting and adjustment of water coal, guarantee that the implementation method of the degree of superheat maintaining boiler when coal varitation is:
(1) water, the temporal coupling of coal: add more piece inertial element in the loop of the instruction of feedwater, the action of water is allowed to lag behind the action of coal all the time, that is coal is allowed first to move, guarantee the degree of superheat and main vapour pressure mating in time, meanwhile emphasize wind, water, the coal synchronization action under the unified command of boiler instruction, thus reach the imagination that boiler gets up soon, not only consequential actions under the commander of boiler instruction, ensures oxygen amount, the degree of superheat, main vapour pressure but also meets the workload demand of electrical network;
(2) water, the quantitative coupling of coal: when ature of coal is good, the degree of superheat rises, and adds water and subtracts coal, and when ature of coal difference, the degree of superheat reduces, at this moment will the adjustment of diminishing coal; Because coal varitation, water coal uniting and adjustment thermal stability degree and cause the change of main vapour pressure, water coal also synchronously should make corresponding adjustment in good time than the dynamic Feedforward changed in corresponding boiler master and static feedforward simultaneously, at this moment main vapour pressure of boiler adjuster then adjusts the pressure regulation quality revised and hold main vapour, the feedwater flow that boiler regulator offsets degree of superheat adjuster with the confluent of ribbing water through three joint inertial elements maintains the relatively stable of feedwater flow, and main vapour pressure is stablized.
Further, with target load by being basic Changing load-acceleration to 2% of the rated power of this unit, its Changing load-acceleration of 2% of the unit of 600MW is 12MW/min.
Further, the output of degree of superheat adjuster oppositely revises coal supply instruction by polygronal function, 0.5: 1.5 ~ 1.5: 0.5.
Further, the differential of the load change amplitude of the difference of target load and unit load instruction, form the time of varying duty and the basic reference point of value, the time of varying duty depends on the amplitude of varying duty and the speed of actual varying duty, the basic reference point of varying duty value is the amplitude limit of the output valve after differential, is generally decided to be between+5 ~-5.
Good effect of the present invention:
1, the dispatching of power netwoks problem of China is adapted to
Meet the mode of China Power Grids scheduling, adopt BFCCS and boiler pressure regulation, steam turbine Power Regulation.Do not retract with pressure and sacrifice network load and response time and meet amplitude of fluctuation and the speed of network load for cost, guarantee that the economical operation of main vapour pressure requires the requirement with boiler overheating degree, thus ensure the economical operation of the safe and reliable of the boiler of boiler coal varitation under various operating mode and burning.
2, the problem of " the fast stove of machine is slow " is solved
Employing indirect energy balances, and establishes the leading position of boiler instruction, and build the static assisted instruction of boiler side rate of load change and the dynamic Feedforward of real-time varying duty amplitude and real-time pressure changeable amplitude, the response accelerating boiler meets the requirement that can dispatch.
3, the problem of coal varitation
3.1, manual and real-time automatically in each control system, the each experience curve of linear coefficient correction, the interlock of wind, water, coal solves the problem of coal varitation, in unit ature of coal immediately, meet unit safety when significantly changing and normally run required main vapour pressure and the demand of the degree of superheat.
3.2, to the load section of each adjuster according to the size of controlled parameter error and place, its proportionality coefficient, the time of integration, differential coefficient and derivative time adopt VARIABLE PARAMETER PID CONTROL.
4, power saving
Controlled by the primary air flow instruction needed for polygronal function correspondence with boiler master instruction, what build primary air flow mother pipe and coal pulverizer heat primary air amount is whole to seam, to the linear acceleration of chalk line, avoid the adjustment of excessive coal amount, reach the effect of economizing on coal.
Accompanying drawing explanation
Fig. 1 is the formation schematic diagram of the boiler master that the embodiment of the present invention provides
Fig. 2 is the boiler master static state feedforward that the embodiment of the present invention provides
Fig. 3 is the boiler master load dynamic Feedforward that the embodiment of the present invention provides
Fig. 4 is the boiler master main vapour pressure dynamic Feedforward that the embodiment of the present invention provides
Fig. 5 is the boiler master pressure controller variable element that the embodiment of the present invention provides
Fig. 6 is the formation of the main vapour pressure instruction that the embodiment of the present invention provides
Fig. 7 is the air output control that the embodiment of the present invention provides
Fig. 8 is the varying duty air inducing dynamic Feedforward that the embodiment of the present invention provides
Fig. 9 is that the secondary air flow that the embodiment of the present invention provides controls
Figure 10 is the Primary air flow control that the embodiment of the present invention provides
Figure 11 is that the hot cold-air flap of coal pulverizer that the embodiment of the present invention provides controls
Figure 12 is that the separator inlet degree of superheat that the embodiment of the present invention provides controls
Figure 13 is the separator inlet degree of superheat adjuster variable element that the embodiment of the present invention provides
Figure 14 is the feedwater flow master control that the embodiment of the present invention provides
Figure 15 is the fuel master control that the embodiment of the present invention provides
Figure 16 is the fuel master control adjuster variable element that the embodiment of the present invention provides
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiments provide a kind of ultra supercritical direct current cooker unit coal varitation control method for coordinating, the method mainly comprises following content:
1, adopt BFCCS mode when extra-supercritical unit normally runs, i.e. main vapour pressure before boiler side conditioner, steam turbine pitch regulates the power of the assembling unit; Do not adopt the time delay of power instruction, do not adopt pressure to retract and sacrifice spatial load forecasting precision.
2, the formation of boiler master:
Boiler master is made up of static state feedforward, dynamic Feedforward and main vapour pressure adjuster;
1) formation of boiler master static state feedforward: add primary frequency modulation power with target load, form the revised target load of unit after the upper and lower amplitude limit of unit; Be basic Changing load-acceleration with 2% of the rated power of this unit, main vapour pressure adopts an amplifying speed rate correction factor by polygronal function when load up, adopt another one amplifying speed rate correction factor when load down, form the Changing load-acceleration of boiler side; Revised target load, through revised load rate, forms the load instruction of boiler side, and revised load instruction is by the coal amount required for polygronal function correspondence; The correction factor TT0 of degree of superheat adjuster when manual passes through coal amount corresponding to the reverse multiplication correction of polygronal function (0.5: 1.5,1.5: 0.5) load by polygronal function and the correction factor TT1 in the automatic situation of degree of superheat adjuster; Boiler master not in automatic situation actual coal amount then take advantage of and equal actual coal amount with the instruction of revised load coal amount except the instruction of revised load coal amount; When boiler master is in automatic situation, lock actual coal amount except the correction factor with revised load coal amount, the final static state feedforward forming boiler master;
2) formation of boiler master load dynamic Feedforward
Form load change amplitude, the differential of load change amplitude by the difference of revised target load and unit load instruction, form the time of varying duty and the basic reference point of value; Load change amplitude forms load change amplitude correction coefficient by polygronal function, when load up, actual main vapour pressure forms load up correction factor by polygronal function, when load down, actual main vapour pressure forms load down correction factor by polygronal function, these two varying duty correction factors carry out switching by rest-set flip-flop and distinguish, and form the correction factor of varying duty; The correction factor of varying duty and the product both load change amplitude correction coefficient form varying duty correction factor, and the differential product of varying duty correction factor and load change amplitude forms preliminary load dynamic Feedforward; The correction factor TT0 of degree of superheat adjuster when manual passes through the reverse multiplication correction (0.5: 1.5 of polygronal function by polygronal function and the correction factor TT1 in the automatic situation of degree of superheat adjuster, 1.5: 0.5) preliminary load dynamic Feedforward, final formation load dynamic Feedforward;
3) speed-raising of boiler master main vapour pressure dynamic Feedforward and the correction of value
Form pressure variance, the differential of pressure variance by the difference of the main vapour pressure before rate limit and the main vapour pressure instruction after rate limit, form and become the time of main vapour pressure and the basic reference point of value; Main vapour pressure amplitude of fluctuation forms main vapour pressure amplitude of fluctuation correction factor by polygronal function, when boosting, actual main vapour pressure is formed by polygronal function and rises pressure correcting coefficient, when dropping force, actual main vapour pressure forms dropping force correction factor by polygronal function, these two pressure changeable correction factors carry out switching by rest-set flip-flop and distinguish, and form the correction factor of pressure changeable; The correction factor of pressure changeable and the product both pressure variance correction factor form pressure changeable correction factor, and the differential product of pressure changeable correction factor and pressure variance forms pre-pressure dynamic Feedforward; The correction factor TT0 of degree of superheat adjuster when manual passes through the reverse multiplication correction (0.5: 1.5 of polygronal function by polygronal function and the correction factor TT1 in the automatic situation of degree of superheat adjuster, 1.5: 0.5) pre-pressure dynamic Feedforward, final mineralization pressure dynamic Feedforward;
4) formation of boiler master pressure controller variable element
The deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the proportionality coefficient that different pressure divergences is corresponding different, main vapour pressure forms ratio correction coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the proportionality coefficient of adjuster;
The deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the time of integration that different pressure divergences is corresponding different, main vapour pressure forms the correction factor time of integration corresponding to different load sections by polygronal function, and the product of the two finally forms the time of integration of adjuster;
The deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the differential coefficient that different pressure divergences is corresponding different, main vapour pressure forms the correction factor of differential coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the differential coefficient of adjuster;
The deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the derivative time that different pressure divergences is corresponding different, main vapour pressure forms correction factor derivative time corresponding to different load sections by polygronal function, and the product of the two finally forms the derivative time of adjuster;
5) formation of main vapour pressure instruction
Load instruction forms the set-point determining the fixed main vapour pressure of cunning by polygronal function, when unit is entirely manual, main vapour pressure setting value is except the output with sliding pressure curve, then the output with sliding pressure curve is taken advantage of, when the coefficient value of the unit not then output of self-locking main vapour pressure setting value and sliding pressure curve when entirely manual, the pressure set points formed is through three joint inertial elements, the time of inertial element is selected by switch, 75 seconds are selected under sliding pressure mode, be 0 under non-sliding pressure mode, rate limit again through operations staff's setting forms main vapour pressure instruction,
6) control of air inducing
The formation of air output control is made up of three feedforwards and air inducing adjuster;
The formation that air inducing three feedovers:
The static state feedforward of air inducing: formed through polygronal function by boiler instruction
The dynamic varying duty feedforward of air inducing: form load change amplitude with revised target load and the difference of unit load instruction, load change amplitude differential, the formation time of varying duty and the basic reference point of value; Load change amplitude forms load change amplitude correction coefficient by polygronal function, when load up, actual main vapour pressure forms load up correction factor by polygronal function, when load down, actual main vapour pressure forms load down correction factor by polygronal function, these two varying duty correction factors carry out switching by rest-set flip-flop and distinguish, and form the correction factor of varying duty; The correction factor of varying duty and the product both load change amplitude correction coefficient form varying duty correction factor, and the differential product of varying duty correction factor and load change amplitude forms final air inducing load dynamic Feedforward; When RB occurs, the derivative time of air inducing load dynamic Feedforward sets to 0, and air inducing load dynamic Feedforward returns 0;
RB air inducing dynamic Feedforward: RB occurs to trigger timer and clocks, and send variable feedforward, then by multiplier according to different RB items, First air RB oppositely revises feedforward direction and numerical value by polygronal function; Air inducing RB, feedwater RB multiplication coefficient correction feedforward numerical value respectively;
7) secondary air flow controls
(1) oxygen content control
It is given that the feedforward of boiler static state forms preliminary oxygen amount by polygronal function, at oxygen content control not in automatic situation, actual oxygen amount except with preliminary oxygen amount given then take advantage of with preliminary oxygen amount given, when locking actual oxygen amount in the automatic situation of oxygen content control except the coefficient given with preliminary oxygen amount, the final setting value forming oxygen flow regulation device;
(2) control of secondary air flow
It is given that the feedforward of boiler static state forms preliminary two secondary amounts by polygronal function, control not in automatic situation at secondary air flow, actual secondary air flow except with preliminary secondary air flow given then take advantage of with preliminary secondary air flow given, actual two secondary amounts are locked except the coefficient given with preliminary secondary air flow under secondary air flow controls automatic situation, the setting value of final formation secondary air flow adjuster, secondary air flow, after the bound restriction of secondary air flow, finally forms the instruction of secondary air flow;
8) Primary air flow control
(1) primary air flow feedforward
The differential of boiler master instruction, forms the basic reference point of primary air flow feedforward time and value; When superpressure, the negative sense consisting of primary air flow amplitude limit feedovers, and when under-voltage, consist of the forward feedforward of primary air flow amplitude limit, these two superpressures, under-voltage two kinds of situations are carried out switching by rest-set flip-flop and distinguished, final formation primary air flow dynamic Feedforward;
(2) control of primary air flow
It is given that the feedforward of boiler static state forms a preliminary secondary amounts by polygronal function, at Primary air flow control not in automatic situation, actual primary air flow except with preliminary primary air flow given then take advantage of with preliminary primary air flow given, when locking actual primary air flow in the automatic situation of Primary air flow control except the coefficient given with preliminary primary air flow, the setting value of final formation primary air flow adjuster, primary air flow adds primary air flow feedforward after the bound restriction of primary air flow, the final instruction forming primary air flow;
9) grind hot blast to control
It is given that feeder instruction forms the hot secondary amounts of preliminary mill by polygronal function, control not in automatic situation in mill heat primary air amount, actual mill heat primary air amount except with tentatively grind that then heat primary air amount is given takes advantage of with tentatively to grind heat primary air amount given, under mill heat primary air amount controls automatic situation, the hot secondary amounts of the actual mill of locking is removed and tentatively grinds the given coefficient of heat primary air amount, the final setting value forming mill heat primary air amount adjuster, primary air flow is the final instruction forming mill heat primary air amount after the bound restriction of primary air flow;
10) main to water management
(1) the separator inlet degree of superheat controls
It is given that separator outlet pressure forms the preliminary degree of superheat by polygronal function, control not in automatic situation in the degree of superheat, the actual degree of superheat except with the preliminary degree of superheat given then take advantage of with the preliminary degree of superheat given, the actual degree of superheat is locked except the coefficient given with the preliminary degree of superheat, the final setting value forming degree of superheat adjuster under the degree of superheat controls automatic situation;
(2) to water management
The feedforward of boiler static state saves inertial elements through three again by polygronal function, it is 0 that the time of inertial element divides when feeding water manual, under there is the automatic situation of feedwater in RB, inertial element is 15, at air inducing RB, different values is given when First air RB and feedwater RB, form preliminary feedwater flow given, control not in automatic situation at feedwater flow, actual feedwater flow except with preliminary feedwater flow given then take advantage of with preliminary feedwater flow given, actual feedwater flow is locked except the coefficient given with preliminary feedwater flow under feedwater flow controls automatic situation, the setting value of final formation feedwater flow regulation device, feedwater flow is after the bound restriction of feedwater flow, the instruction of final formation feedwater flow,
(3) separator inlet degree of superheat adjuster variable element
The deviation of degree of superheat setting value and the actual degree of superheat passes through polygronal function, the proportionality coefficient that different deviations is corresponding different, main vapour pressure forms ratio correction coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the proportionality coefficient of adjuster;
The deviation of degree of superheat setting value and the actual degree of superheat passes through polygronal function, the time of integration that different deviations is corresponding different, main vapour pressure forms the correction factor time of integration corresponding to different load sections by polygronal function, and the product of the two finally forms the time of integration of adjuster;
The deviation of degree of superheat setting value and the actual degree of superheat passes through polygronal function, the differential coefficient that different deviations is corresponding different, main vapour pressure forms the correction factor of differential coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the differential coefficient of adjuster;
The deviation of degree of superheat setting value and the actual degree of superheat passes through polygronal function, the derivative time that different deviations is corresponding different, main vapour pressure forms correction factor derivative time corresponding to different load sections by polygronal function, and the product of the two finally forms the derivative time of adjuster;
11) fuel master control
(1) fuel master control accepts the setting value of the instruction formation fuel master control of boiler master;
(2) VARIABLE PARAMETER PID CONTROL of fuel trimmer
Feeder drops into automatic number of units by the corresponding different proportionality coefficient of polygronal function;
Feeder drops into automatic number of units by polygronal function corresponding different time of integration;
Feeder drops into automatic number of units by the corresponding different differential coefficient of polygronal function;
Feeder drops into automatic number of units by polygronal function corresponding different derivative time;
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a ultra supercritical direct current cooker unit coal varitation control method for coordinating, it is characterized in that, first this ultra supercritical direct current cooker unit coal varitation control method for coordinating builds the boiler master of indirect energy balance: realize determining coal amount with load by polygronal function, the proportionate relationship of load and coal amount is 2: 1, determines primary air flow with coal amount, the proportionate relationship of coal amount and primary air flow is 1: 2, determines secondary air flow with coal amount, the proportionate relationship of coal amount and secondary air flow is 1: 2.5, determines feedwater flow with coal amount, and the proportionate relationship of coal amount and feedwater flow is 1: 3.5; Establish the leading position of boiler master instruction, uniting and adjustment wind, water, coal, than ensureing that the degree of superheat of boiler meets the requirements, guarantee the control accuracy of pressure before unit machine simultaneously, and then meet the amplitude of load variations and the speed of electrical network demand;
Boiler master is feedovered by static state and dynamic Feedforward is formed;
1) formation of static feedforward: in order to form real feedforward, rebuild the load instruction of boiler side; The load instruction unit target load of boiler side through boiler side Changing load-acceleration and form; The Changing load-acceleration of boiler side is basic Changing load-acceleration with 2% of the rated power of this unit, pass through unit ascending, descending load varying load condition, different load interval judgement, again amplification process is carried out to basic Changing load-acceleration, it is the basic Changing load-acceleration of 2 times when load up, it is the basic Changing load-acceleration of 4 times when load down, reach the object prior to unit load instruction action, what overcome boiler delays with delayed; Consider the change of ature of coal simultaneously, degree of superheat adjuster uniting and adjustment water, coal, adjustment water coal ratio, when the degree of superheat is higher, the coefficient that degree of superheat adjuster exports increases, increase the instruction of feedwater, the output of degree of superheat adjuster simultaneously oppositely revises coal instruction by polygronal function, when coal instruction has changed, its primary air flow and secondary air flow then respective change regulate, therefore along with the change of ature of coal, electricity, coal change than also, and the output of degree of superheat adjuster oppositely revises electric coal experience curve by polygronal function;
2) speed-raising of load dynamic Feedforward and the correction of value: the differential of the load change amplitude of the difference of target load and unit load instruction, form the time of varying duty and the basic reference point of value, distinguish lifting load operating modes between different loading zones, different, it is the basic value of 2 times when load up, be the basic value of 4 times when load down, thus form different dynamic Feedforward, form load dynamic Feedforward truly, guarantee the demand of the various operating mode of AGC, meet various index;
3) speed-raising of main vapour pressure variable-pressure operation dynamic Feedforward and the correction of value: in the process of varying duty, under unit adopts variable-pressure operation mode, carry out the change of two kinds and load variations is given and main vapour pressure change is given in the load section of below 90%Pe simultaneously, and variable-pressure operation is still being carried out after load variations terminates, when there is no varying duty, operations staff revises the biased existence still having variable-pressure operation, therefore the method with reference to varying duty builds boiler master transformation dynamic Feedforward, thus forms the double feed forward of transformation and varying duty;
4) formation of main vapour pressure instruction: general unit master control main vapour pressure instruction is that load instruction polygronal function forms the set-point determining the fixed main vapour pressure of cunning, the rate limit then through operations staff's setting forms main vapour pressure instruction; For the characteristic of supercritical DC furnace, increase by three rank inertial elements after pressure set points before machine after pressure curve, thus reach the regulatory function that the dynamic Feedforward strengthening load when varying loading weakens adjuster, meet the intervention of operations staff to pressure setting simultaneously;
5) formation of boiler master pressure controller variable element:
Ratio variable element is formed: the deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the proportionality coefficient that different pressure divergences is corresponding different, main vapour pressure forms ratio correction coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the proportionality coefficient of adjuster;
Integration variable element is formed: the deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the time of integration that different pressure divergences is corresponding different, main vapour pressure forms the correction factor time of integration corresponding to different load sections by polygronal function, and the product of the two finally forms the time of integration of adjuster;
Differential variable element is formed: the deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the differential coefficient that different pressure divergences is corresponding different, main vapour pressure forms the correction factor of differential coefficient corresponding to different load sections by polygronal function, and the product of the two finally forms the differential coefficient of adjuster; The deviation of main vapour pressure setting value and actual main vapour pressure passes through polygronal function, the derivative time that different pressure divergences is corresponding different, main vapour pressure forms correction factor derivative time corresponding to different load sections by polygronal function, and the product of the two finally forms the derivative time of adjuster;
By carrying out VARIABLE PARAMETER PID CONTROL to boiler master pressure controller, effectively can regulate main vapour pressure, avoiding concussion and the toning of main vapour pressure;
6) responding ability of wind, water, coal interlock quickening boiler is built: boiler master instruction goes out primary air flow instruction, secondary air flow instruction and feedwater instruction by polygronal function correspondence; Boiler master instruction changes, and corresponding primary air flow, secondary air flow and feedwater flow, coal-supplying amount all correspondingly change, and forms wind, water, coal uniting and adjustment, accelerates the response speed of boiler, overcomes the problem of boiler low-response;
In the mill thorax running coal pulverizer, have a certain amount of coal dust, when boiler master instruction increases, the heat primary air amount of primary air flow and mill also can increase, and mill thorax stores a pruinescence blowout part in burner hearth, and the coal dust flow velocity in tube cell is accelerated; When boiler master instruction reduces, the heat primary air amount of primary air flow and mill reduces, and the coal dust accumulation in mill thorax can temporarily increase, and in tube cell, the flow velocity of coal dust slows down, thus improves the responding ability of boiler heat load; The hot cold-air flap with coal pulverizer of exerting oneself of primary air fan one in front and one in back cooperatively interacts, and has both improved the responding ability of boiler, can ensure again the stable of the outlet temperature of coal pulverizer;
7) water coal uniting and adjustment reply coal varitation: implement the uniting and adjustment of water coal, when the higher increase feedwater flow of the degree of superheat, reduces overtemperature, and the output of degree of superheat adjuster simultaneously oppositely reduces the flow of coal supply; When degree of superheat minimizing feedwater flow on the low side, raise degree of superheat temperature, the output of degree of superheat adjuster simultaneously oppositely increases the flow of coal supply, guarantees the stable of the degree of superheat maintaining boiler when coal varitation;
Described water coal uniting and adjustment reply coal varitation: implement the uniting and adjustment of water coal, guarantee that the implementation method of the degree of superheat maintaining boiler when coal varitation is:
(1) water, the temporal coupling of coal: add three rank inertial elements in the loop of the instruction of feedwater, the action of water is allowed to lag behind the action of coal all the time, that is coal is allowed first to move, guarantee the degree of superheat and main vapour pressure mating in time, meanwhile emphasize wind, water, the coal synchronization action under the unified command of boiler master instruction, thus reach the imagination that boiler gets up soon, consequential actions under the commander of boiler master instruction, had not only ensured oxygen amount, the degree of superheat, main vapour pressure but also had met the workload demand of electrical network;
(2) water, the quantitative coupling of coal: when ature of coal is good, the degree of superheat rises, and adds water and subtracts coal, and when ature of coal difference, the degree of superheat reduces, and at this moment will carry out the adjustment of diminishing coal; Because coal varitation, water coal uniting and adjustment thermal stability degree and when causing the change of main vapour pressure, water coal ratio changes, dynamic Feedforward in corresponding boiler master and static feedforward also synchronously should make corresponding adjustment in good time simultaneously, at this moment main vapour pressure of boiler adjuster then adjusts the pressure regulation quality revised and hold main vapour, and main vapour pressure is stablized;
Adopt BFCCS mode when extra-supercritical unit normally runs, now can drop into AGC and run;
Be basic Changing load-acceleration with 2% of the rated power of unit, its basic Changing load-acceleration of 2% of the unit of 600MW is 12MW/min;
The output valve of degree of superheat adjuster revises coal instruction by polygronal function is oppositely corresponding, and the output valve of degree of superheat adjuster is 0.5: 1.5 ~ 1.5: 0.5 by the corresponding relation of polygronal function and coal instruction;
The differential of the load change amplitude of the difference of target load and unit load instruction, form the time of varying duty and the basic reference point of value, the time of varying duty depends on the amplitude of varying duty and the speed of actual varying duty, the basic reference point of varying duty value is the amplitude limit of the output valve after differential, is generally decided to be between+5 ~-5.
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