CN103807847A - Large-capacity boiler whole-course water feeing control system - Google Patents
Large-capacity boiler whole-course water feeing control system Download PDFInfo
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- CN103807847A CN103807847A CN201410051437.8A CN201410051437A CN103807847A CN 103807847 A CN103807847 A CN 103807847A CN 201410051437 A CN201410051437 A CN 201410051437A CN 103807847 A CN103807847 A CN 103807847A
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Abstract
The invention discloses a large-capacity boiler whole-course water feeing control system which solves the technical problem that a large-capacity boiler starting-stopping process is controlled manually. The system comprises a real-time on-line optimization control circuit system which is established by a PI adjusting module, a large selecting module, a speed changing electric water feeding pump, a switch, an adjusting valve and the like, the independent whole-course water feeing automatic control system is formed, through a circuit, full-load whole-course automatic control of large-capacity boiler water feeding control from a cold state to a unit can be achieved, the labor intensity of unit operation personnel is lowered, and the operation stability of a large-capacity boiler is improved.
Description
Technical field
The invention of this project is a kind of automatic control system, relates to a kind of PI automatic control system of large-sized station boiler.
Background technology
At present, large electric power plant unit generally adopts the mode of machine, stove combined launch, and boiler and steam turbine require to carry out sliding parameter startup according to start up curve, and many employings level pressure method with resuperheat monoblock is carried out sliding parameter startup.Along with the increase of unit capacity and the raising of parameter; in startup and stopping process, need the item argument that monitors and operate to increase; the frequency of operation also increases; traditional employing manual adjustment start-up course cannot adapt to the requirement that combined launch is produced, need in opening, stopping process, also realize auto-adjustment control.The equal system that can realize automatic adjusting in opening, stopping process and while normally operation that so-called full adjustment system just refers to unit, full adjustment is that routine regulates relatively.In full adjustment, it is wherein important reconciling items that drum boiler feedwater regulates, prior art is to adopt tandem the Regulative system of three impulses feedwater, this regulating system can only the load of boiler reach rated value 70% time could drop into automatic regulating system, be all that manual operation regulates control before this, control is the one-part form Feed Water Regulation System that adopts the configuration of full capacity pump, because the safety operation area scope of selected pump type is very wide, it is again full capacity configuration, no matter unit is sliding pressure startup or fixed pressure operation, operating point all can not move on to beyond place of safety, feed pump outlet pressure is not set and regulates subsystem.When underload, maintain water level by single pulse regulating system control bypass feed-regulating valve aperture.The output of single pulse adjuster PI1 is sent in general election module and is compared with the feed pump minimum operating speed signal of setting, and in underload process, the output signal of PI1 is less, therefore initial start stage, feed pump will move with fixed rotating speed.In the time that unit load rises to 25% left and right, system is switched to three momentum tandem working methods by single pulse working method, and now bypass water-supply valve reaches full-gear.Because having increased to, the control signal of now system output is greater than unallowed minimum signal, so system is converted to the rotating speed that regulates pump reposefully by controlling opening of valve.When unit load reaches 30% left and right, main feed-regulating valve all opens to reduce restriction loss as far as possible, and system enters and adjusts pump state completely.In this, control and regulation mode exists regulation unit that complexity is set, and regulates poor with degree of regulation not in time problem.
Summary of the invention
The invention provides a kind of large-sized boiler whole-process feedwater control systems, the regulation unit that has solved prior art existence arranges complexity, regulates poor with degree of regulation not in time technical problem.
The present invention solves above technical problem by following scheme:
A kind of large-sized boiler whole-process feedwater control systems, comprises proportional integral module, general election module, speed change electrically driven feed pump, speed change electrically driven feed pump scoop tube, handover module and control valve; The steam water-level signal of large-sized boiler place unit links together with the input of the first proportional integral adjustment module and the input of the second proportional integral adjustment module respectively; The steam water-level set value signal of large-sized boiler links together with the input of the first proportional integral adjustment module and the input of the second proportional integral adjustment module respectively; First output of proportional integral adjustment module and the first input end of handover module link together; The input of the output of the second proportional integral adjustment module and the 3rd proportional integral adjustment module links together; The feedwater flow signal of large-sized boiler place unit and the input of the 3rd proportional integral adjustment module link together; The main steam flow signal of large-sized boiler place unit and the input of the 3rd proportional integral adjustment module link together; The second input of the output of the 3rd proportional integral adjustment module and handover module links together; The input of the output of handover module and general election module links together; The input of the output of general election module and speed change electrically driven feed pump scoop tube links together; The output of boiler speed change electrically driven feed pump scoop tube and the drive end of speed change electrically driven feed pump link together; The output of handover module and the control end of control valve link together; The minimum speed signal of speed change electrically driven feed pump and the input of general election module link together, and are in series with speed change electrically driven feed pump and control valve on large-sized boiler feed pipe.
The invention solves the technical problem that large-sized boiler shutdown process is manually controlled, can alleviate unit operation personnel's labour intensity, improve the stability of boiler start/ stop process.
accompanying drawing explanation:
Fig. 1 is control system structural representation of the present invention.
The specific embodiment
A kind of large-sized boiler whole-process feedwater control systems, comprises proportional integral module, general election module, speed change electrically driven feed pump B, speed change electrically driven feed pump scoop tube, handover module T and control valve F1; The steam water-level signal H of large-sized boiler place unit links together with the input I2 of the first proportional integral adjustment module PI1 and the input I3 of the second proportional integral adjustment module PI2 respectively; The steam water-level set value signal H0 of large-sized boiler links together with the input I1 of the first proportional integral adjustment module PI1 and the input I4 of the second proportional integral adjustment module PI2 respectively; The first output O1 of proportional integral adjustment module PI1 and the first input end K1 of handover module T link together; The input I6 of the output O2 of the second proportional integral adjustment module PI2 and the 3rd proportional integral adjustment module PI3 links together; The input I5 of the feedwater flow signal W of large-sized boiler place unit and the 3rd proportional integral adjustment module PI3 links together; The input I7 of the main steam flow signal D of large-sized boiler place unit and the 3rd proportional integral adjustment module PI3 links together; The second input K2 of the output O3 of the 3rd proportional integral adjustment module PI3 and handover module T links together; The input I8 of the output K3 of handover module T and general election module DX links together; The input I9 of the output O4 of general election module DX and speed change electrically driven feed pump scoop tube links together; The output O5 of boiler speed change electrically driven feed pump scoop tube and the drive end I12 of speed change electrically driven feed pump B link together; The output K3 of handover module T and the control end I11 of control valve F1 link together; The input I10 of the minimum speed signal Nmin of speed change electrically driven feed pump and general election module DX links together, and is in series with speed change electrically driven feed pump B and control valve F1 on large-sized boiler feed pipe.
Claims (1)
1. a large-sized boiler whole-process feedwater control systems, comprises proportion differential module, general election module, speed change electrically driven feed pump (B), speed change electrically driven feed pump scoop tube, handover module (T) and control valve (F1); The steam water-level signal (H) of large-sized boiler place unit links together with the input (I2) of the first proportional integral adjustment module (PI1) and the input (I3) of the second proportional integral adjustment module (PI2) respectively; The steam water-level set value signal (H0) of large-sized boiler links together with the input (I1) of the first proportional integral adjustment module (PI1) and the input (I4) of the second proportional integral adjustment module (PI2) respectively; The output (O1) of the first proportional integral adjustment module (PI1) links together with the first input end (K1) of handover module (T); The output (O2) of the second proportional integral adjustment module (PI2) links together with the input (I6) of the 3rd proportional integral adjustment module (PI3); The feedwater flow signal (W) of large-sized boiler place unit links together with the input (I5) of the 3rd proportional integral adjustment module (PI3); The main steam flow signal (D) of large-sized boiler place unit links together with the input (I7) of the 3rd proportional integral adjustment module (PI3); The output (O3) of the 3rd proportional integral adjustment module (PI3) links together with second input (K2) of handover module (T); The output (K3) of handover module (T) links together with the input (I8) of general election module (DX); The output (O4) of general election module (DX) links together with the input (I9) of speed change electrically driven feed pump scoop tube; The output (O5) of boiler speed change electrically driven feed pump scoop tube links together with the drive end (I12) of speed change electrically driven feed pump (B); The output (K3) of handover module (T) links together with the control end (I11) of control valve (F1); The minimum speed signal (Nmin) of speed change electrically driven feed pump links together with the input (I10) of general election module (DX), is in series with speed change electrically driven feed pump (B) and control valve (F1) on large-sized boiler feed pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410051437.8A CN103807847A (en) | 2014-02-16 | 2014-02-16 | Large-capacity boiler whole-course water feeing control system |
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| CN201410051437.8A CN103807847A (en) | 2014-02-16 | 2014-02-16 | Large-capacity boiler whole-course water feeing control system |
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| CN201410051437.8A Pending CN103807847A (en) | 2014-02-16 | 2014-02-16 | Large-capacity boiler whole-course water feeing control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613460A (en) * | 2015-02-02 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Medium-pressure water supply system for fuel gas thermal power plant and start and stop method thereof |
| CN104613461A (en) * | 2015-02-02 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Low-pressure water supply system for fuel gas thermal power plant and start and stop method thereof |
| CN112684778A (en) * | 2020-12-24 | 2021-04-20 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Steam generator water supply system diagnosis method based on multi-source information reinforcement learning |
| CN115264485A (en) * | 2022-09-27 | 2022-11-01 | 国网山西省电力公司电力科学研究院 | Water level automatic control system for water storage tank of supercritical boiler |
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| JPH10115405A (en) * | 1996-10-11 | 1998-05-06 | Sumitomo Metal Mining Co Ltd | Control method for water supply amount of boiler drum |
| CN102563598A (en) * | 2012-01-31 | 2012-07-11 | 山东电力研究院 | Control optimizing method for master controller of supercritical unit boilers |
| CN102705811A (en) * | 2012-03-28 | 2012-10-03 | 广东电网公司电力科学研究院 | Feed water control method for supercritical concurrent boiler without boiler-water circulating pump |
| CN103225801A (en) * | 2013-04-06 | 2013-07-31 | 国家电网公司 | Intelligent multi-mode PID (proportional integral differential) water-feeding control system for large generator unit |
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2014
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| JPH10115405A (en) * | 1996-10-11 | 1998-05-06 | Sumitomo Metal Mining Co Ltd | Control method for water supply amount of boiler drum |
| CN102563598A (en) * | 2012-01-31 | 2012-07-11 | 山东电力研究院 | Control optimizing method for master controller of supercritical unit boilers |
| CN102705811A (en) * | 2012-03-28 | 2012-10-03 | 广东电网公司电力科学研究院 | Feed water control method for supercritical concurrent boiler without boiler-water circulating pump |
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Non-Patent Citations (1)
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| 刘文军: "智能控制技术在大型火电机组给水全程控制***中的应用研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, 15 April 2008 (2008-04-15), pages 68 - 74 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613460A (en) * | 2015-02-02 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Medium-pressure water supply system for fuel gas thermal power plant and start and stop method thereof |
| CN104613461A (en) * | 2015-02-02 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Low-pressure water supply system for fuel gas thermal power plant and start and stop method thereof |
| CN104613461B (en) * | 2015-02-02 | 2016-06-15 | 华北电力科学研究院有限责任公司 | Gas power station low pressure feed water system and start and stop method thereof |
| CN112684778A (en) * | 2020-12-24 | 2021-04-20 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Steam generator water supply system diagnosis method based on multi-source information reinforcement learning |
| CN115264485A (en) * | 2022-09-27 | 2022-11-01 | 国网山西省电力公司电力科学研究院 | Water level automatic control system for water storage tank of supercritical boiler |
| CN115264485B (en) * | 2022-09-27 | 2023-01-13 | 国网山西省电力公司电力科学研究院 | Water level automatic control system for water storage tank of supercritical boiler |
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Application publication date: 20140521 |