Control Strategy and RB Logic of the Feed-Water System with Steam-Driven and Motor-Driven Pumps in Parallel for 660-MW Units

doi:10.11930/j.issn.1004-9649.201711004

Abstract

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

CLC Number:

TK32

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711004

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

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