CN103791485A - 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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- CN103791485A CN103791485A CN201410072686.5A CN201410072686A CN103791485A CN 103791485 A CN103791485 A CN 103791485A CN 201410072686 A CN201410072686 A CN 201410072686A CN 103791485 A CN103791485 A CN 103791485A
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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 operations staff's labour intensity, guarantee the safe operation of unit, require realization more advanced, the scope of application is wider, the automatic control system that function is more complete, this has just produced omnidistance control system.And feed water control system has a very important effect power plant is in service, in whole-process feedwater control systems, steam water-level is a dum boiler important monitoring parameter in service, equilibrium relation between its reaction boiler steam load and confluent, weigh the whether mark of balance of boiler steam and water circuit, maintaining its bag water level is the necessary condition that guarantees boiler and Turbine Safety operation within the specific limits.
Feedwater Whole Process Control System be an energy at boiler startup, blowing out, underload and occur at unit under the various operating modes such as some major accident, can realize system that feedwater controls automatically and judgement, conversion, the fault detect from a kind of state of a control to another kind of state of a control and also usually automatically completing by system itself.In boiler operatiopn, steam water-level is a very important parameter.If water level is too high, can affect the effect that carbonated drink separates, use gas device fails; And water level is too low, can destroy steam/water circulating, when serious, cause the bursting of boilers.The steam flow that simultaneously high performance boiler produces is very large, and the volume of drum is comparatively speaking less, so that the Water Level Control of Steam seems is extremely important.The task that feedwater is controlled automatically, controls feedwater flow exactly, makes itself and evaporation capacity keep balance, maintains water level in drum and changes in allowed limits.
At present, in the configuration of the equipment of domestic fired power generating unit, generally speaking, water supply system mainly designs steam feed pump A, the B of two each self energy band 60% rated loads and one can be with the electrically driven feed pump of 30%～50% rated load.To be equipped with 30% electrically driven feed pump unit as example, in 0 to 12%～15% rated load (MCR), by feed water by-pass control valve control water level, the operation of electrically driven feed pump constant speed, electrically driven feed pump minimum flow control system is responsible for guaranteeing that the flow of electrically driven feed pump is greater than its permission minimum discharge, and pump discharge pressure control system and steam feed pump are not worked; 12%～15% to 25%～30%MCR, by electrically driven feed pump speed regulating control water level, feed water by-pass control 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 is not worked; 25%～30% to 45%～50%MCR, by electrically driven feed pump speed regulating control water level, feedwater main inlet control 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 is not worked; 45%～50% to 100%MCR, steam feed pump speed regulating control water level, feedwater main inlet control valve control steam feed pump outlet pressure, electrically driven feed pump is not worked.
Traditional feedwater control mode is: steam water-level is three momentum tandem controls in the time that unit normally moves, 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, THRSEL module is output as all the other 2 better mean values; If there are 2 steam water-level measuring points to become bad point, THRSEL module is output as 1 better measured value of residue; If three is all bad point, export constantly, remain a before measurement value that degenerates.THRSEL module is output as drum level measurement value PV, it asks difference with the steam water-level setting value SP setting by analog quantity setting module A through subtraction block DEV1, difference is delivered to PID1(proportional-integral-differential) computing module carries out computing, the output valve of PID1 is the feedwater flow setting value SP of the tandem control second level, it and feedwater flow measured value PV ask difference through subtraction block DEV2, and difference is delivered to PID2(proportional-integral-differential) computing module regulates control.When unit normally moves, 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 balance computing, then delivers to and in A/B steam feed pump, carries out working control; Banlance module has Self-balancing, work as A/B steam feed pump one " automatically " (Auto), one " manually " is (Man) time, the changing value of " manually " side steam feed pump instruction can equate by Banlance inverse change, amplitude in the instruction of " automatically " side steam feed pump automatically, can guarantee that so total power that pumps is constant, and then guaranteed water level is stable.In the time there is an arbitrary steam feed pump fault, it is stable to guarantee steam water-level that connection opens electrically driven feed pump.But during to the steam feed pump of platform one by one fault in office,, not yet there is verdict how specifically control aspect of steam feed pump and electrically driven feed pump.Be generally, the collection control operations staff of unit is according to the ruuning situation of steam feed pump, the manual command value by electrically driven feed pump of timing is arranged on a desired value, non real-time changing value, therefore in the time breaking down, can cause the command value of electrically driven feed pump improper, cause steam water-level fluctuation violent, unit safety operation is caused to significant impact.
Summary of the invention
The present invention is in order to address the above problem, a kind of fired power generating unit Feedwater system optimization control method has been proposed, when this control method can the steam feed pump of platform one by one fault in office, rapidly electrically driven feed pump is regulated, guarantee 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 occur exerting oneself decline, the non-problem such as 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, comprises that steam feed pump A, the B of two each self energy band 60% rated loads and one can, with the electrically driven feed pump of 30%～50% rated load, specifically comprise the following steps:
(1) running status of A steam feed pump judgement: the run signal and the actual speed that detect A steam feed pump;
(2) running status of B steam feed pump judgement: the run signal and the actual speed that detect B steam feed pump;
(3) the input stand-by state of electrically driven feed pump judgement: detect electrically driven feed pump and whether dropped into for subsequent use;
(4) production burst override instruction: according to the correlation behavior of step (1)-step (3), while satisfying condition, send a 10s pulse override instruction signal " 1 " through logic "and" operation to electrically driven feed pump;
(5) calculate electrically driven feed pump override instruction: unit load value is marked to the one conversion, through calculating, obtain electrically driven feed pump override instruction;
(6) break down simultaneously, the steam feed pump instruction that remains a normal operation increases to original 2 times; Electrically driven feed pump operator receives after override instruction, exports the instruction comprehensively calculating 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 move, do not occur MFT(main fuel trip) and electrically driven feed pump dropped into for subsequent use,, in the time that the arbitrary steam feed pump of A, B breaks down, send a 10s pulse override instruction signal " 1 ".
In described step (5), the concrete grammar that calculates electrically driven feed pump override instruction is specially: unit load value is marked to 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, can calculate electric pump needs the percentage of on-load, this number is calculated through function F 2 (x) conversion, draw electrically driven feed pump override instruction.
Described function F 1 (x) is specially:
Wherein, P1% is that steam feed pump maximum can be with the percentage of unit load.
Described function F 2 (x) is specially:
Wherein, P2% is that electrically driven feed pump maximum can be with the percentage of unit load; The electrically driven feed pump that Vmin provides for producer starts minimum opening value.
Beneficial effect of the present invention is: when the present invention passes through an arbitrary steam feed pump fault, rapidly normal operation steam feed pump and electrically driven feed pump are regulated, guarantee 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 occur exerting oneself decline, the non-problem such as 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.
The specific embodiment:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1-Figure 3,, resuperheat subcritical to certain 300MW, the coal-fired unit water supply system of condensing-type are optimized control, and being equipped with the steam feed pump of two each self energy band 60% rated loads and one to unit can be with the electrically driven feed pump of 30% rated load.
Control method of the present invention is:
(1) judging of A steam feed pump running status: A steam feed pump run signal is greater than 2000rpm/min for " 1 " and its rotary speed actual value;
(2) judging of B steam feed pump running status: B steam feed pump run signal is greater than 2000rpm/min for " 1 " and its rotary speed actual value;
(3) generation of electrically driven feed pump override instruction: if A, B steam feed pump all move, do not occur MFT(main fuel trip) and electrically driven feed pump dropped into for subsequent use,, in the time that the arbitrary steam feed pump of A, B breaks down, send a 10s pulse override instruction signal " 1 ";
(4) break down simultaneously, the steam feed pump instruction that remains a normal operation increases to original 2 times; Electrically driven feed pump operator receives after override instruction, exports the instruction comprehensively calculating according to unit load and steam feed pump energy on-load to actuator.
Concrete steps are:
Step 1. according to the operation of A, B steam feed pump, there is MFT(main fuel trip) and electrically driven feed pump input state for subsequent use judge whether to send 10s pulse override instruction signal " 1 ";
Step 2. is marked one by unit load value and is 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, can calculate electric pump needs the percentage of on-load, this number is calculated through function F 2 (x) conversion, draw electrically driven feed pump override instruction.
Function F 1 (x) is specially:
Wherein, 60% for steam feed pump maximum can be with the percentage of unit load.
Function F 2 (x) is specially:
Wherein, 30% for electrically driven feed pump maximum can be with the percentage of unit load; 10% electrically driven feed pump providing 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 are 66%, suppose B steam feed pump fault, now A steam feed pump command value is all arranged and is limited to 100% by the rapid balance of Balance module to 100%(PID and manual operator module), now respective function F1 (x) is output as 60%, 80%-60%=20%, through function F 2 (x) computing, its output valve is 20*100/30=67%, and electrically driven feed pump override instruction is output as 67% immediately.
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 modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (5)
1. a fired power generating unit Feedwater system optimization control method, described fired power generating unit water supply system, comprise that steam feed pump A, the B of two each self energy band 60% rated loads and one can, with the electrically driven feed pump of 30%～50% rated load, is characterized in that: specifically comprise the following steps:
(1) running status of A steam feed pump judgement: the run signal and the actual speed that detect A steam feed pump;
(2) running status of B steam feed pump judgement: the run signal and the actual speed that detect B steam feed pump;
(3) the input stand-by state of electrically driven feed pump judgement: detect electrically driven feed pump and whether dropped into for subsequent use;
(4) production burst override instruction: according to the correlation behavior of step (1)-step (3), while satisfying condition, send a 10s pulse override instruction signal " 1 " through logic "and" operation to electrically driven feed pump;
(5) calculate electrically driven feed pump override instruction: unit load value is marked to the one conversion, through calculating, obtain electrically driven feed pump override instruction;
(6) break down simultaneously, the steam feed pump instruction that remains a normal operation increases to original 2 times; Electrically driven feed pump operator receives after override instruction, exports the instruction comprehensively calculating according to unit load and steam feed pump energy on-load to actuator.
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 (4), refer to that if satisfy condition A, B steam feed pump all move, do not occur main fuel trip MFT and electrically driven feed pump has dropped into for subsequent use,, in the time that the arbitrary steam feed pump of A, B breaks down, send a 10s pulse override instruction signal " 1 ".
3. 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 that calculates electrically driven feed pump override instruction is specially: unit load value is marked to 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, can calculate electric pump needs the percentage of on-load, this number is calculated through function F 2 (x) conversion, draw electrically driven feed pump override instruction.
4. a kind of fired power generating unit Feedwater system optimization control method as claimed in claim 3, is characterized in that: described function F 1 (x) is specially:
Wherein, P1% is that steam feed pump maximum can be with the percentage of unit load.
5. a kind of fired power generating unit Feedwater system optimization control method as claimed in claim 3, is characterized in that: described function F 2 (x) is specially:
Wherein, P2% is that electrically driven feed pump maximum can be with the percentage of unit load; The electrically driven feed pump that Vmin provides for producer starts minimum opening value.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105508231A (en) * | 2016-02-03 | 2016-04-20 | 华北电力科学研究院有限责任公司 | Control method and system of common electrically-driven feed pump for thermal generator sets |
| 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 |
| CN109882422A (en) * | 2019-01-10 | 2019-06-14 | 华润电力（贺州）有限公司 | A kind of double flow moves feed pump turbine recirculation pipe road device and its control method |
| CN110953027A (en) * | 2016-08-26 | 2020-04-03 | 三菱日立电力系统株式会社 | Pump system, operating method thereof and power generation equipment |
| CN111678120A (en) * | 2020-06-02 | 2020-09-18 | 哈尔滨沃华智能发电设备有限公司 | Control method for joint start of steam feed pump and trip electric pump of 330MW subcritical unit |
| CN111794934A (en) * | 2020-08-13 | 2020-10-20 | 刘亚辉 | Method for changing steam feed pump system into full frequency conversion electric feed pump system and brand new logic control system thereof |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113202737A (en) * | 2021-05-24 | 2021-08-03 | 中核核电运行管理有限公司 | Start-stop control circuit and method for top shaft oil pump of steam turbine of nuclear power plant |
| CN113983449A (en) * | 2021-09-30 | 2022-01-28 | 山西河坡发电有限责任公司 | Feed pump control method based on deep peak regulation |
| 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 |
| CN115680795A (en) * | 2022-09-22 | 2023-02-03 | 国能太仓发电有限公司 | Water feed pump control method and device, storage medium and electronic equipment |
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Cited By (17)
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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 |
| CN105508231A (en) * | 2016-02-03 | 2016-04-20 | 华北电力科学研究院有限责任公司 | Control method and system of common electrically-driven feed pump for thermal generator sets |
| CN110953027A (en) * | 2016-08-26 | 2020-04-03 | 三菱日立电力系统株式会社 | Pump system, operating method thereof and power generation equipment |
| 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 |
| CN109882422A (en) * | 2019-01-10 | 2019-06-14 | 华润电力（贺州）有限公司 | A kind of double flow moves feed pump turbine recirculation pipe road device and its control method |
| CN111678120A (en) * | 2020-06-02 | 2020-09-18 | 哈尔滨沃华智能发电设备有限公司 | Control method for joint start of steam feed pump and trip electric pump of 330MW subcritical unit |
| CN111794934B (en) * | 2020-08-13 | 2024-04-30 | 刘亚辉 | Method for changing pneumatic feed pump system into full-frequency-conversion electric feed pump system and brand-new logic control system thereof |
| CN111794934A (en) * | 2020-08-13 | 2020-10-20 | 刘亚辉 | Method for changing steam feed pump system into full frequency conversion electric feed pump system and brand new logic control system thereof |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113202737A (en) * | 2021-05-24 | 2021-08-03 | 中核核电运行管理有限公司 | Start-stop control circuit and method for top shaft oil pump of steam turbine of nuclear power plant |
| CN113983449B (en) * | 2021-09-30 | 2024-02-20 | 山西河坡发电有限责任公司 | Depth peak shaving-based water supply pump control method |
| CN113983449A (en) * | 2021-09-30 | 2022-01-28 | 山西河坡发电有限责任公司 | Feed pump control method based on deep peak regulation |
| 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 |
| CN115680795A (en) * | 2022-09-22 | 2023-02-03 | 国能太仓发电有限公司 | Water feed pump control method and device, storage medium and electronic equipment |
| CN115680795B (en) * | 2022-09-22 | 2024-07-26 | 国能太仓发电有限公司 | Water supply pump control method and device, storage medium and electronic equipment |
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