CN106123005A - The coal-supplying amount pre-control method of coal unit boiler feed-forward - Google Patents
The coal-supplying amount pre-control method of coal unit boiler feed-forward Download PDFInfo
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- CN106123005A CN106123005A CN201610464265.6A CN201610464265A CN106123005A CN 106123005 A CN106123005 A CN 106123005A CN 201610464265 A CN201610464265 A CN 201610464265A CN 106123005 A CN106123005 A CN 106123005A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/34—Signal processing; Details thereof with feedforward processing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/10—Generating vapour
Abstract
The present invention relates to adjust control system boiler feed-forward to control technical field, it it is a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, comprise the following steps: the first step, load carries out signal triggering, second step, load carries out signal and triggers pulse, 3rd step, in during pulse, T2 output is stored in In2, 4th step, T3 exports to In1, In1 with In2 exports after being multiplied to rate limit blocks input, 5th step, pre-plus-minus coal regeneration rate control realization process, 6th step, work as T4, when T5 does not triggers, definite value A is the regeneration rate of pre-plus-minus back segment, 7th step, T6, T7 is that load pulse signal when carrying out triggers and switches to speed B, T6 output controls to limit fall off rate value, T7 output controls to limit climbing speed value.The present invention controls main steam pressure by advanced predetermined coal-supplying amount during the big load change of coal unit, load change fast and stable, improves and coordinates control performance, obtains the effect optimized.
Description
Technical field
The present invention relates to adjust control system boiler feed-forward to control technical field, be the coal supply of a kind of coal unit boiler feed-forward
Amount pre-control method.
Background technology
It is to coordinate to control unit load and main steam pressure for coal fired power generation unit coordinatedcontrol system main task
Two parameters of power.The former directly contacts with unit frequency modulation peak regulation, makes load variations in time according to electrical network demand；The latter is related to
Stable operation of the boiler, the means controlling main steam pressure are mainly Limestone control, because the energy conversion links of boiler oil
Many, process complexity, has big inertia, long time delay characteristic, and its control mode is to coordinate PID and the attached control that feedovers by boiler more
System, the feedforward plays the predicting function of relevant parameter change, and the fuel quantity utilizing good parameter of adjusting to calculate directly is folded
It is added in boiler and coordinates PID output, in main steam pressure reaction to PID input deviation and complete coal-supplying amount before changing output bias and open
Ring pre-adjustment, makes unit possess regulations speed faster.
Current coal unit boiler feed-forward comprises: actual load instruction (LDC) function, the pre-add-subtract control of coal-supplying amount, drum
Pressure differential (Once-through Boiler without), main steam pressure deviation differential, main steam pressure sets differential.Wherein by reaching target in advance
Load coal-supplying amount, to adapt to the fast-changing requirement of load, adds coal-supplying amount pre-add-subtract control feedforward, it is possible to carry out at unit
The starting point of load variations just carries out significantly coal-supplying amount in boiler master PID output in advance according to the change size of target load
It is increased or decreased, and finally recovers to 0 after keeping a period of time.
Existing coal-supplying amount pre-control technical scheme is by target load instruction and actual negative after load carries out signal triggering
The difference of lotus and the switching of 0, after switching selection, data respectively enter the input of two functions, and one is used for controlling pulse duration, separately
One is used for controlling to add and subtract coal-supplying amount size in advance, and load carries out signal and triggers the pulse signal of the variable duration that the former gives, arteries and veins
The coal-supplying amount size selecting the latter's definition during punching feedovers to boiler master, when pulse duration terminates, again with faster rate output
Recover to 0 with slow rate, it is achieved the pre-add-subtract control of coal-supplying amount.
Prior art shortcoming be mainly after this feedforward action adds and subtracts coal-supplying amount in advance recover to the speed of 0 be fixing, only
Boiler master PID closed loop regulation main steam pressure is relied on to offset the disturbance of recovery process, with the master of direct controlled device boiler
Steam pressure is not set up any control and contacts.Occurring that controlled volume unit load all has the same of downward trend with main steam pressure
Time, this feedforward action is still recovered with fixed rate descent direction, then need boiler master PID to carry out the feedforward of this part of closed loop compensation anti-
Actuating quantity, makes this feedforward action become new interference volume, increases boiler master PID to main steam pressure regulating time, reduces machine
Group load and main steam pressure control precision and coordination control performance.
Another shortcoming is that to add and subtract coal-supplying amount size in advance be fixing to this feedforward action, it is impossible to self adaptation coal burning caloricity
Change.Power plant soot caloric value is one and does not fix irregular change, when it changes, and coal amount needed for unit power
Size changes therewith, and now, fixing pre-plus-minus coal-supplying amount can not reach the amount of requirement, can only pass through boiler PID closed loop compensation
This part coal-supplying amount, so regulates process time by increase, reduces and coordinates control performance.
Summary of the invention
The invention provides a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, overcome above-mentioned prior art
Deficiency, its can effectively solve main steam pressure and load and the dynamic deviation of respective setting value in prior art problem and
The pre-unmatched problem of plus-minus coal-supplying amount that coal varitation causes.
The technical scheme is that and realized by following measures: the coal supply of a kind of above-mentioned coal unit boiler feed-forward
Amount pre-control method, comprises the following steps:
The first step, load carries out signal triggering: controlled with the handover module T1 of 0 with the difference of actual load by target load instruction
System, after switching selection, data respectively enter the input value of pulse duration control function f1 (x), pre-control coal-supplying amount function f2 (x)；
Second step, load carries out signal triggering pulse: f1 (x) output data and is used for controlling pulse duration, and pulse signal divides
Do not export to three data switching module T2, T6, T7 and not gate；
3rd step, during pulse in, T2 output by control pre-control coal-supplying amount function f2 (x) output switching to 0, T2
Output is stored in In2.
4th step, total fuel quantity extremely switches than correction function f3 (x) output correction factor through merit-coal with actual load ratio
Module T3, T3 output exports to rate limit blocks input after being multiplied to In1, In1 and In2；
5th step, pre-plus-minus coal regeneration rate control realization process: boiler main steam pressure is through rate calculations function f4
X () tries to achieve its rate of change, rate calculations function f4 (x) exports
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s)；
When rate of change more than 0.0002MPa/s time illustrate that it is on the rise, and non-with the AND burst length behind the door be pre-add
Subtract coal amount and enter Restoration stage, then T5 switches to 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance
System, continue after pressure does not has ascendant trend with speed A recover, through T7 output to rate limit blocks make pre-subtract coal recover
Climbing speed is limited to 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance, when pressure does not rise
Continue after trend to recover with speed A；
When less than-0.0002MPa/s, the main steam pressure rate of change tried to achieve in real time i.e. illustrates that it has a downward trend, and with
AND adds and subtracts coal amount in advance and enters Restoration stage, then T4 switches to 0, makes pre-coal recover through T6 output to rate limit blocks
Fall off rate is limited to 0, it is achieved during locking application of load, coal-supplying amount pre-add is backward subtracts the control that direction is recovered, when pressure does not decline
Continue after trend to recover with speed A；
6th step, when T4, T5 do not trigger, definite value A is the regeneration rate of pre-plus-minus back segment；
7th step, T6, T7 are that load pulse signal when carrying out triggers and switches to speed B, and definite value B is initial quick pre-add
The generation rate subtracted, T6 output controls to limit fall off rate value, and T7 output controls to limit climbing speed value；
8th step, T6 output is controlled to limit fall off rate value by rate limit blocks, T7 output controls to limit climbing speed
Value and In1 with In2 be multiplied after after output valve carries out Macro or mass analysis, obtain to pre-plus-minus coal control instruction with the speed output of change
Go out result.
Further optimization and/or improvements to foregoing invention technical scheme are presented herein below:
The present invention controls feedforward Limestone control logic during varying duty by changing coordination in control system, it is possible to
Improve varying duty process main steam pressure and spatial load forecasting speed, reduce the dynamic of main steam pressure and load and respective setting value
Deviation.By increasing ature of coal correction function, solve the pre-unmatched problem of plus-minus coal-supplying amount that coal varitation causes, improve pre-add
Subtract the coal amount adaptivity when coal varitation.The present invention passes through advanced predetermined coal-supplying amount during the big load change of coal unit,
Load change fast and stable control main steam pressure, improve and coordinate control performance, obtain the effect optimized.
Accompanying drawing explanation
Accompanying drawing 1 is the method flow diagram of the embodiment of the present invention 1.
Detailed description of the invention
The present invention is not limited by following embodiment, can determine specifically according to technical scheme and practical situation
Embodiment.
In the present invention, for the ease of describing, the description of the relative position relation of each parts is all according to Figure of description 1
Butut mode be described, such as: the position relationship of forward and backward, upper and lower, left and right etc. is based on the Butut of Figure of description
Direction determines.
Below in conjunction with embodiment and accompanying drawing, the invention will be further described:
Embodiment 1: as shown in Figure 1, a kind of coal-supplying amount pre-control method of coal unit boiler feed-forward, including following step
Rapid:
The first step, load carries out signal triggering: controlled with the handover module T1 of 0 with the difference of actual load by target load instruction
System, after switching selection, data respectively enter the input value of pulse duration control function f1 (x), pre-control coal-supplying amount function f2 (x).
Second step, load carries out signal triggering pulse: f1 (x) output data and is used for controlling pulse duration, and pulse signal divides
Do not export to three data switching module T2, T6, T7 and not gate；
3rd step, during pulse in, T2 output by control pre-control coal-supplying amount function f2 (x) output switching to 0, T2
Output is stored in In2；
4th step, total fuel quantity extremely switches than correction function f3 (x) output correction factor through merit-coal with actual load ratio
Module T3, T3 output exports to rate limit blocks input after being multiplied to In1, In1 and In2；
5th step, pre-plus-minus coal regeneration rate control realization process: boiler main steam pressure is through rate calculations function f4
X () tries to achieve its rate of change, rate calculations function f4 (x) exports
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s)；
When rate of change more than 0.0002MPa/s time illustrate that it is on the rise, and non-with the AND burst length behind the door be pre-add
Subtract coal amount and enter Restoration stage, then T5 switches to 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance
System, continue after pressure does not has ascendant trend with speed A recover, through T7 output to rate limit blocks make pre-subtract coal recover
Climbing speed is limited to 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance, when pressure does not rise
Continue after trend to recover with speed A；
When less than-0.0002MPa/s, the main steam pressure rate of change tried to achieve in real time i.e. illustrates that it has a downward trend, and with
AND adds and subtracts coal amount in advance and enters Restoration stage, then T4 switches to 0, makes pre-coal recover through T6 output to rate limit blocks
Fall off rate is limited to 0, it is achieved during locking application of load, coal-supplying amount pre-add is backward subtracts the control that direction is recovered, when pressure does not decline
Continue after trend to recover with speed A；
6th step, when T4, T5 do not trigger, definite value A is the regeneration rate of pre-plus-minus back segment；
7th step, T6, T7 are that load pulse signal when carrying out triggers and switches to speed B, and definite value B is initial quick pre-add
The generation rate subtracted, T6 output controls to limit fall off rate value, and T7 output controls to limit climbing speed value；
8th step, T6 output is controlled to limit fall off rate value by rate limit blocks, T7 output controls to limit climbing speed
Value and In1 with In2 be multiplied after after output valve carries out Macro or mass analysis, obtain to pre-plus-minus coal control instruction with the speed output of change
Go out result.
This switching lock-in control logic can be recovered within the time period the most reversely regulated, and makes this feedforward action not do
Disturb boiler master PID control and regulation, shorten main steam pressure and regulate stabilization time, and then improve varying duty process main steam pressure
And spatial load forecasting speed, rate of change so monitoring adjusts can reduce the dynamic of main steam pressure and load and respective setting value
Deviation.
As shown in Figure 1, in the 4th step, merit-coal can compensate for causing due to coal varitation than correction function f3 (x)
Coal amount differentiation gives, and possesses the capability for correcting of pre-plus-minus coal-supplying amount.
As shown in Figure 1, in the 5th step, while completing the most pre-plus-minus coal-supplying amount generating loop, according to speedometer
Calculate the main steam rate of change size that function f4 (x) exports and the selection utilizing many switching combining module thereof, add and subtract recovery in advance
Stage control regeneration rate, reaches to recover the pre-purpose adding and subtracting coal amount in this stage according to main steam pressure Long-term change trend unperturbed,
Do not give reversely to adjust to boiler master PID.
Embodiment 2: as shown in table 1,2,3, below as a example by 300MW subcritical drum boiler unit, introduces function parameter and sets
Put:
Unit relevant device overview: unit rated power is 300MW, boiler is Dongfang Boiler (Group) Co., Ltd.
The fire coal produced, subcritical, Natural Circulation, single drum, single burner hearth, corner tangential firing, resuperheat, balanced draft,
Closed seal, all steel framework, dry ash extraction, coal-powder boiler.Steam turbine is that Dongfang Turbine Co., Ltd., Dongfang Electric Group manufactures
Subcritical, resuperheat, HP-IP combined casing, single shaft twin-cylinder double flow, a heat supply indirect air cooling steam turbine.
As shown in table 1, pulse duration control function f1 (x) input (In) is target and actual load deviation (MW), output
(Out) it is pre-plus-minus coal amount burst length (s)；
As shown in table 2, pre-control coal-supplying amount function f2 (x) input (In) is target and actual load deviation (MW), output
(Out) for adding and subtracting coal-supplying amount (t/h) in advance；
As shown in table 3, merit-coal is merit coal ratio than correction function f3 (x) input (In), and output (Out) is repaiied for pre-plus-minus coal
Positive coefficient；
As shown in Figure 1, rate calculations function f4 (x) output
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, when Stime is the scan period
Between (s).
As shown in Figure 1, described generation rate A=40.0 (t/h)/min；Regeneration rate B=4.0 (t/h)/min.
Embodiment 3: as shown in table 4,5,6, as a example by 350MW supercritical DC furnace unit, the parameter introducing function is arranged:
Unit relevant device overview: unit capacity is 350MW, boiler is that Harbin Boiler Co., Ltd. produces
Single burner hearth, balanced draft, dry ash extraction, all steel frame, full overhung construction, π type, closed seal arrange, resuperheat, super face
Boundary's pressure variable-pressure operation, use the direct current cooker of atmosphere flash-off start-up system without recirculation pump.Steam turbine is east vapour
The supercritical that turbine company limited manufactures, resuperheat, an indirect air cooling twin-cylinder double flow condensing turbine.
As shown in table 4, pulse duration control function f1 (x) input (In) is target and actual load deviation (MW), output
(Out) it is pre-plus-minus coal amount burst length (s):
As shown in table 5, pre-control coal-supplying amount function f2 (x) input (In) is target and actual load deviation (MW), output
(Out) for adding and subtracting coal-supplying amount (t/h) in advance
As shown in table 6, merit-coal is merit coal ratio than correction function f3 (x) input (In), and output (Out) is repaiied for pre-plus-minus coal
Positive coefficient:
As shown in Figure 1, rate calculations function f4 (x) formula is ibid.
As shown in Figure 1, described generation rate A=30.0 (t/h)/min；Regeneration rate B=5.0 (t/h)/min.
Embodiment 4: example is as a example by 660MW supercritical DC furnace unit, and the parameter introducing function is arranged:
Unit relevant device overview: unit capacity is 660MW, and boiler is produced by Shanghai Electric Group Co., Ltd
Supercritical, resuperheat, quadrangle tangential circle tangential firing, balanced draft, closed seal, dry ash extraction, an all steel framework direct current
Pulverized-coal fired boiler.Steam turbine is produced by Dongfan Steam Turbine Factory, model be supercritical, resuperheat, single shaft, triplex four steam discharge,
Condensing turbine.
As shown in table 7, pulse duration control function f1 (x) input (In) is target and actual load deviation (MW), output
(Out) it is pre-plus-minus coal amount burst length (s):
As shown in table 8, pre-control coal-supplying amount function f2 (x) input (In) is target and actual load deviation (MW), output
(Out) for adding and subtracting coal-supplying amount (t/h) in advance
As shown in table 9, merit-coal is merit coal ratio than correction function f3 (x) input (In), and output (Out) is repaiied for pre-plus-minus coal
Positive coefficient:
As shown in Figure 1, rate calculations function f4 (x) formula is ibid.
As shown in Figure 1, described generation rate A=50.0 (t/h)/min；Regeneration rate B=6.0 (t/h)/min.
Above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can basis
It is actually needed the non-essential technical characteristic of increase and decrease, meets the demand of different situations.
Table 1 is 300MW unit pulse duration control function f1(x) polygronal function mapping table
Table 2 is 300MW unit pre-control coal-supplying amount function f2(x) polygronal function mapping table
Table 3 is that 300MW unit merit-coal is than correction function f3(x) polygronal function mapping table
| 1 | 2 | 3 | 4 | 5 | |
| IN((t/h)/MW) | 0 | 0.4 | 0.6 | 0.7 | 0.8 |
| OUT | 0.85 | 0.85 | 1.0 | 1.1 | 1.12 |
Table 4 is 350MW unit pulse duration control function f1(x) polygronal function mapping table
Table 5 is 350MW unit pre-control coal-supplying amount function f2(x) polygronal function mapping table
Table 6 is that 350MW unit merit-coal is than correction function f3(x) polygronal function mapping table
Table 7 is 660MW unit pulse duration control function f1(x) polygronal function mapping table
Table 8 is 660MW unit pre-control coal-supplying amount function f2(x) polygronal function mapping table
Table 9 is that 660MW unit merit-coal is than correction function f3(x) polygronal function mapping table
Claims (1)
1. the coal-supplying amount pre-control method of a coal unit boiler feed-forward, it is characterised in that comprise the following steps:
The first step, load carries out signal triggering: controlled with the handover module T1 of 0 with the difference of actual load by target load instruction,
After switching selects, data respectively enter pulse duration control function f1(x), pre-control coal-supplying amount function f2The input value of (x)；
Second step, load carries out signal and triggers pulse: f1X () output data are used for controlling pulse duration, pulse signal exports respectively
To three data switching module T2, T6, T7 and not gate；
3rd step, during pulse in, T2 output by control pre-control coal-supplying amount function f2X the output switching of () is to 0, T2 exports
It is stored in In2；
4th step, total fuel quantity with actual load ratio through merit-coal than correction function f3X () output correction factor is to handover module
T3, T3 output exports to rate limit blocks input after being multiplied to In1, In1 and In2；
5th step, pre-plus-minus coal regeneration rate control realization process: boiler main steam pressure is through rate calculations function f4X () is asked
Obtain its rate of change, rate calculations function f4X () exports
Wherein In (t) is current input value, and In (t-1) is the input value of last scan period, and Stime is time scan period
(s)；
Illustrate that it is on the rise when rate of change is more than 0.0002MPa/s, and non-with the AND burst length add and subtract coal the most in advance
Amount enters Restoration stage, then T5 switches to 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance, when
Pressure continues after not having ascendant trend to recover with speed A, makes the pre-rising subtracting coal recovery through T7 output to rate limit blocks
Rate limit is 0, it is achieved during block decrease load, coal-supplying amount subtracts the backward control adding direction recovery in advance, when pressure does not has ascendant trend
Rear continuation recovers with speed A；
When less than-0.0002MPa/s, the main steam pressure rate of change tried to achieve in real time i.e. illustrates that it has downward trend and pre-with AND
Plus-minus coal amount enters Restoration stage, then T4 switches to 0, exports the lower reduction of speed making pre-coal recover to rate limit blocks through T6
Rate is limited to 0, it is achieved during locking application of load, coal-supplying amount pre-add is backward subtracts the control that direction is recovered, after pressure does not has downward trend
Continue to recover with speed A；
6th step, when T4, T5 do not trigger, definite value A is the regeneration rate of pre-plus-minus back segment；
7th step, T6, T7 are that load pulse signal when carrying out triggers and switches to speed B, and definite value B is the most pre-initial plus-minus
Generation rate, T6 output controls to limit fall off rate value, and T7 output controls to limit climbing speed value；
8th step, rate limit blocks by T6 output control limit fall off rate value, T7 output control limit climbing speed value with
And In1 with In2 be multiplied after after output valve carries out Macro or mass analysis, draw knot with the speed output of change to pre-plus-minus coal control instruction
Really.
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| CN112286057A (en) * | 2020-11-03 | 2021-01-29 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Coal amount optimizing and predicting control method based on AGC optimization of thermal power plant |
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