CN103791485B - Optimal control method of water supply system of thermal power generating unit - Google Patents
Optimal control method of water supply system of thermal power generating unit Download PDFInfo
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Abstract
The invention discloses an optimal control method of a water supply system of a thermal power generating unit. According to the method, an electrically-driven feed pump override instruction is worked out according to the operating state of a steam feed pump A, the operating state of a steam feed pump B and the switching-in standby state of an electrically-driven feed pump; the electrically-driven feed pump can be immediately regulated once any steam feed pump breaks down, so that rapid recovery of feedwater flow is guaranteed, the fluctuation range of the boiler water level is effectively reduced, stability of important parameters such as pressure, temperature and load is guaranteed, the problems of output drop, unplanned shutdown and the like of the unit are solved, and safe and stable operation of a power grid is guaranteed radically.
Description
Technical field
The present invention relates to a kind of fired power generating unit Feedwater system optimization control method.
Background technology
Along with the increase of generating set capacity and improving constantly of parameter, the control of unit and operational management become and become increasingly complex and difficulty.In order to alleviate the labour intensity of operations staff, ensure the safe operation of unit, require that realization is more advanced, the scope of application is wider, the automatic control system that function is more complete, this generates whole-process control system.And feed water control system has very important effect in power plant runs, in whole-process feedwater control systems, steam water-level is an important monitoring parameter during dum boiler runs, equilibrium relation between its reaction boiler steam load and confluent, weigh the mark whether boiler steam and water circuit balances, maintaining its bag water level is the necessary condition ensureing that boiler and Turbine Safety run within the specific limits.
Feedwater Whole Process Control System is an energy at boiler startup, blowing out, underload and under there is the various different operating modes such as some major accident at unit, the system that can realize feeds water controls automatically and also usually automatically completing by system itself from a kind of state of a control to the judgement of another kind of state of a control, conversion, fault detect.In boiler operatiopn, steam water-level is a very important parameter.If water level is too high, then can affect the effect that carbonated drink is separated, use gas device fails; And water level is too low, then can destroys steam/water circulating, time serious, cause the bursting of boilers.The steam flow of high performance boiler generation is very large simultaneously, and the volume of drum is less comparatively speaking, so the Water Level Control of Steam seems extremely important.The task that feedwater controls automatically, controls feedwater flow exactly, makes itself and evaporation capacity keep balancing, and maintains water level in drum and changes in allowed limits.
At present, in the Equipments Setting of domestic fired power generating unit, generally speaking, steam feed pump A, B of each self energy band 60% rated load of water supply system major design two and one can with the electrically driven feed pumps of 30% ~ 50% rated load.To be equipped with the electrically driven feed pump unit of 30%, at 0 to 12% ~ 15% rated load (MCR), by feed water by-pass governor valve control water level, electrically driven feed pump constant speed is run, electrically driven feed pump minimum flow control system is responsible for ensureing that the flow of electrically driven feed pump is greater than it and allows minimum discharge, and pump discharge pressure control system and steam feed pump do not work; 12% ~ 15% to 25% ~ 30%MCR, by electrically driven feed pump speed regulating control water level, feed water by-pass governor valve control electrically driven feed pump outlet pressure, because flow is greater than 30% of electrically driven feed pump metered flow, electrically driven feed pump minimum flow control system is closed automatically, and steam feed pump does not work; 25% ~ 30% to 45% ~ 50%MCR, by electrically driven feed pump speed regulating control water level, feedwater main inlet control valve controls electrically driven feed pump outlet pressure, because flow is greater than 30% of electrically driven feed pump metered flow, electrically driven feed pump minimum flow control system is closed automatically, and steam feed pump does not work; 45% ~ 50% to 100%MCR, steam feed pump speed regulating control water level, feedwater main inlet control valve controls steam feed pump outlet pressure, and electrically driven feed pump does not work.
Traditional feedwater control mode is: steam water-level is three impulses serials control when unit normally runs, steam water-level is selected by one-out-three selector THRSEL, be traditionally arranged to be and choose intermediate value, if there is a steam water-level measuring point to become bad point, then THRSEL module exports as all the other 2 better mean values; If there are 2 steam water-level measuring points to become bad point, then THRSEL module exports as the better measured value of residue 1; If three is all bad point, then export constant, remain a before measurement value that degenerates.The output of THRSEL module is drum level measurement value PV, it asks difference with the steam water-level setting value SP set by analog quantity setting module A through subtraction block DEV1, difference delivers to PID1(proportional-integral-differential) computing module carries out computing, the output valve of PID1 is the feedwater flow setting value SP of the serials control second level, it and feedwater flow measured value PV ask difference through subtraction block DEV2, and difference delivers to PID2(proportional-integral-differential) computing module carries out regulable control.When unit normally runs, steam feed pump A/B keeps exerting oneself balance movement; Electrically driven feed pump is now stand-by state, and actual exerting oneself is 0.The output of PID2 module is delivered in gain balance module Banlance and is carried out balancing algorithms, then delivers in A/B steam feed pump and carries out working control; Banlance module has Self-balancing, namely as A/B steam feed pump " automatically " (Auto), during " manually " (Man), the changing value of " manually " side steam feed pump instruction can be automatically equal by Banlance inverse change, amplitude in the steam feed pump instruction of " automatically " side, such energy ensures that total power that pumps is constant, and then guaranteed water level is stable.When there is an arbitrary steam feed pump fault, connection opens electrically driven feed pump to guarantee that steam water-level is stablized.But during to the steam feed pump fault of platform one by one in office, not yet there is verdict steam feed pump and electrically driven feed pump how specifically control aspect.Be generally, the collection control operations staff of unit is according to the ruuning situation of steam feed pump, what timing was manual is arranged on a desired value by the command value of electrically driven feed pump, non real-time changing value, therefore when a failure occurs it, the command value of electrically driven feed pump can be caused improper, cause steam water-level to fluctuate violent, significant impact is caused to unit safety operation.
Summary of the invention
The present invention is in order to solve the problem, propose a kind of fired power generating unit Feedwater system optimization control method, this control method can the steam feed pump fault of platform one by one in office time, rapidly electrically driven feed pump is regulated, ensure that feedwater flow recovers rapidly, effectively reduce steam water-level fluctuating range, guarantee the stable of the important parameters such as pressure, temperature, load, prevent unit from occurring output drop, the non-problem such as to stop, ensure power network safety operation from source.
To achieve these goals, the present invention adopts following technical scheme:
A kind of fired power generating unit Feedwater system optimization control method, described fired power generating unit water supply system, comprise steam feed pump A, B of two each self energy band 60% rated loads and one with the electrically driven feed pump of 30% ~ 50% rated load, specifically can comprise the following steps:
(1) running status of A steam feed pump judges: the run signal and the actual speed that detect A steam feed pump;
(2) running status of B steam feed pump judges: the run signal and the actual speed that detect B steam feed pump;
(3) whether the input stand-by state of electrically driven feed pump judges: detect electrically driven feed pump and dropped into for subsequent use;
(4) production burst override instruction: according to the correlation behavior of step (1)-step (3), when satisfying condition, sends 10s pulse override instruction signal " 1 " through logic "and" operation to electrically driven feed pump;
(5) electrically driven feed pump override instruction is calculated: unit load value being carried out mark one conversion, through calculating, obtaining electrically driven feed pump override instruction;
(6) break down simultaneously, remain a steam feed pump instruction normally run and increase to original 2 times; After electrically driven feed pump operator receives override instruction, export the instruction comprehensively calculated according to unit load and steam feed pump energy on-load to actuator.
In described step (4), refer to that if satisfy condition A, B steam feed pump all runs, MFT(main fuel trip do not occur) and electrically driven feed pump has dropped into for subsequent use, then when the arbitrary steam feed pump of A, B breaks down, send 10s pulse override instruction signal " 1 ".
In described step (5), the concrete grammar calculating electrically driven feed pump override instruction is specially: unit load value is carried out mark one and be converted to 0 ~ 100%, calculate the percentage that unit actual load is corresponding, deduct its load percentage that can be with that its instruction of steam feed pump instant of failure calculates through function F 1 (x) conversion, the percentage that electric pump needs on-load can be calculated, this number is calculated through function F 2 (x) conversion, draws electrically driven feed pump override instruction.
Described function F 1 (x) is specially:
Wherein, P1% is that steam feed pump is maximum can with the percentage of unit load.
Described function F 2 (x) is specially:
Wherein, P2% is that electrically driven feed pump is maximum can with the percentage of unit load; Vmin starts minimum opening value for the electrically driven feed pump that producer provides.
Beneficial effect of the present invention is: the present invention is by during to an arbitrary steam feed pump fault, rapidly normal operation steam feed pump and electrically driven feed pump are regulated, ensure that feedwater flow recovers rapidly, effective reduction steam water-level fluctuating range, guarantee the stable of the important parameters such as pressure, temperature, load, prevent unit from occurring output drop, the non-problem such as to stop, ensure power network safety operation from source.
Accompanying drawing explanation
Fig. 1 is conventional fired power generating unit feedwater heat flow diagrams;
Fig. 2 is conventional fired power generating unit feedwater control logic figure;
Fig. 3 optimizes rear fired power generating unit feedwater control logic figure.
Detailed description of the invention:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1-Figure 3, resuperheat, condensing-type coal unit water supply system subcritical to certain 300MW are optimized control, be equipped with the steam feed pump of two each self energy band 60% rated loads to unit and one can with the electrically driven feed pump of 30% rated load.
Control method of the present invention is:
(1) the judging of A steam feed pump running status: A steam feed pump run signal is as " 1 " and its rotary speed actual value is greater than 2000rpm/min;
(2) the judging of B steam feed pump running status: B steam feed pump run signal is as " 1 " and its rotary speed actual value is greater than 2000rpm/min;
(3) generation of electrically driven feed pump override instruction: if A, B steam feed pump all runs, MFT(main fuel trip does not occur) and electrically driven feed pump has dropped into for subsequent use, then when the arbitrary steam feed pump of A, B breaks down, send 10s pulse override instruction signal " 1 ";
(4) break down simultaneously, remain a steam feed pump instruction normally run and increase to original 2 times; After electrically driven feed pump operator receives override instruction, export the instruction comprehensively calculated according to unit load and steam feed pump energy on-load to actuator.
Concrete steps are:
Step 1. is run according to A, B steam feed pump, MFT(main fuel trip occurs) and electrically driven feed pump input condition adjudgement for subsequent use whether send 10s pulse override instruction signal " 1 ";
Unit load value is carried out mark one and is converted to 0 ~ 100% by step 2., calculate the percentage that unit actual load is corresponding, deduct its load percentage that can be with that its instruction of steam feed pump instant of failure calculates through function F 1 (x) conversion, the percentage that electric pump needs on-load can be calculated, this number is calculated through function F 2 (x) conversion, draws electrically driven feed pump override instruction.
Function F 1 (x) is specially:
Wherein, 60% is that steam feed pump is maximum can with the percentage of unit load.
Function F 2 (x) is specially:
Wherein, 30% is that electrically driven feed pump is maximum can with the percentage of unit load; 10% electrically driven feed pump provided for producer starts minimum opening value.
If unit actual load is 240MW(perunit value is 240/300*100%=80%), A, B steam feed pump instruction average is 66%, suppose B steam feed pump fault, then now A steam feed pump command value all arranges the upper limit by Balance module rapid equalisation to 100%(PID and manual operator module is 100%), the now output of respective function F1 (x) is 60%, 80%-60%=20%, through function F 2 (x) computing, its output valve is 20*100/30=67%, and namely electrically driven feed pump override instruction exports immediately is 67%.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (4)
1. a fired power generating unit Feedwater system optimization control method, described fired power generating unit water supply system, comprise steam feed pump A, B of two each self energy band 60% rated loads and one with the electrically driven feed pump of 30% ~ 50% rated load, can it is characterized in that: specifically comprise the following steps:
(1) running status of A steam feed pump judges: the run signal and the actual speed that detect A steam feed pump;
(2) running status of B steam feed pump judges: the run signal and the actual speed that detect B steam feed pump;
(3) whether the input stand-by state of electrically driven feed pump judges: detect electrically driven feed pump and dropped into for subsequent use;
(4) production burst override instruction: according to the correlation behavior of step (1)-step (3), when satisfying condition, sends 10s pulse override instruction signal " 1 " through logic "and" operation to electrically driven feed pump;
(5) electrically driven feed pump override instruction is calculated: unit load value being carried out mark one conversion, through calculating, obtaining electrically driven feed pump override instruction;
(6) break down simultaneously, remain a steam feed pump instruction normally run and increase to original 2 times; After electrically driven feed pump operator receives override instruction, export the instruction comprehensively calculated according to unit load and steam feed pump energy on-load to actuator;
In described step (4), refer to if satisfy condition that A, B steam feed pump all runs, main fuel trip MFT occur and electrically driven feed pump has dropped into for subsequent use, then when any steam feed pump of A, B breaks down, send 10s pulse override instruction signal " 1 ".
2. a kind of fired power generating unit Feedwater system optimization control method as claimed in claim 1, it is characterized in that: in described step (5), the concrete grammar calculating electrically driven feed pump override instruction is specially: unit load value is carried out mark one and be converted to 0 ~ 100%, calculate the percentage that unit actual load is corresponding, deduct its load percentage that can be with that its instruction of steam feed pump instant of failure calculates through function F 1 (x) conversion, the percentage that electrically driven feed pump needs on-load can be calculated, this number is calculated through function F 2 (x) conversion, draw electrically driven feed pump override instruction.
3. a kind of fired power generating unit Feedwater system optimization control method as claimed in claim 2, is characterized in that: described function F 1 (x) is specially:
Wherein, P1% is that steam feed pump is maximum can with the percentage of unit load.
4. a kind of fired power generating unit Feedwater system optimization control method as claimed in claim 2, is characterized in that: described function F 2 (x) is specially:
Wherein, P2% is that electrically driven feed pump is maximum can with the percentage of unit load, and Vmin starts minimum opening value for the electrically driven feed pump that producer provides.
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| CN104633648A (en) * | 2014-12-05 | 2015-05-20 | 国家电网公司 | Analog quantity control method for feed pump set with different powers |
| CN105508231B (en) * | 2016-02-03 | 2017-09-01 | 华北电力科学研究院有限责任公司 | A kind of control method and system of the public electrically driven feed pump of thermal power generation unit |
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| CN106704212A (en) * | 2016-12-29 | 2017-05-24 | 中国能源建设集团华北电力试验研究院有限公司 | Undisturbed switching control method for standby pump of electrically-driven feed pumps |
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| CN114543071A (en) * | 2022-01-11 | 2022-05-27 | 国能浙江宁海发电有限公司 | Water-feeding pump recycling accurate water distribution energy-saving system adaptive to deep peak shaving of steam turbine set |
| CN114688005A (en) * | 2022-02-22 | 2022-07-01 | 西安热工研究院有限公司 | Automatic control method for quickly starting standby electric pump |
| CN115405914A (en) * | 2022-07-22 | 2022-11-29 | 江苏南通发电有限公司 | Steam feed pump parallel-cut pump sequential control logic design optimization method |
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