660 MW机组汽泵电泵并列运行的给水控制及RB策略

doi:10.11930/j.issn.1004-9649.201711004

摘要/Abstract

摘要： 针对塔山电厂超临界660MW直流炉机组汽泵电泵并列运行的给水系统，采用“水跟煤”的控制策略，并通过中间点温度对给水进行修正。给水主控输出转速指令，通过折线函数形成电泵勺管控制指令，实现了汽泵、电泵并列运行，能够同时参与给水调节。针对汽泵RB，通过联启电泵并逐渐增大勺管开度，保证了给水流量的平稳下降，维持汽温的稳定。运行和试验结果表明，本控制方案对给水系统的控制能够保证机组的安全、稳定运行，在给水泵发生RB时可以稳定、快速地减负荷，使主参数平稳过渡。

关键词: 直流炉机组, 给水控制, RB, 汽动给水泵, 电动给水泵, 并列运行

Abstract: Regarding the feed-water system with steam-driven and motor-driven pumps in parallel in the 660 MW once-through unit of Tashan Power Generation Co Ltd, the “water following coal” method and the intermediate steam temperature modification are used for the control of the feed-water system. The demand of the water system is transformed to the control signals fed into the motor-driven pump in terms of polyline function. Therefore, the steam-driven and motor-driven pumps can operate simultaneously and contribute to the control of the feed-water system. During the runback (RB) of the steam-driven water pump, by interlocking the start of motor-driven pump and increasing the opening percentage of the scoop tube, the supply water flow is reduced smoothly such that the steam temperature can be kept steady. The operation and test results show that the control strategy for the feed-water system can ensure the safety and stability of the unit in operation. In addition, in the feed-water pump runback process, the unit can shed the load promptly and steadily while the transition of major parameters still remains smooth.

Key words: once-through unit, control of feed-water system, runback (RB), steam-driven water pump, motor-driven water pump, parallel running

中图分类号:

TK32

邢智炜, 岳涛, 刘磊. 660 MW机组汽泵电泵并列运行的给水控制及RB策略[J]. 中国电力, 2018, 51(3): 29-34.

XING Zhiwei, YUE Tao, LIU Lei. Control Strategy and RB Logic of the Feed-Water System with Steam-Driven and Motor-Driven Pumps in Parallel for 660-MW Units[J]. Electric Power, 2018, 51(3): 29-34.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201711004

https://www.electricpower.com.cn/CN/Y2018/V51/I3/29

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