Research and Application of Expanded Unit Element System in Circulating Water Drainage System for Coal Fired Power Plant

doi:10.11930/j.issn.1004-9649.201711013

Abstract

Abstract: Higher than designed water temperature at the outlet of the natural draft cooling tower will seriously affect the economic efficiency of the unit. In order to solve such problem in Heyuan power plant, the amount of circulating water into the cooling tower was first reduced. Then by taking account of the current situation of more frequent standby dispatch whereas more hours of operation for a single unit, this paper demonstrates and implements the expanded unit system transformation of the circulating water drainage system, in which the circulating water were diverted to two cooling towers for heat exchange and cooling. The experimental results show that the amount of water entering each cooling tower decreases significantly while the operation of the circulating water system is still safe and controllable after the expansion of the unit operation of the recirculating water drainage system. Under various typical operating conditions, the condenser back pressure decreases by 0.42~0.96 kPa. Particularly, the higher the unit load, the more the circulating water volume and the more significantly the condenser back pressure decreases. Therefore, the economy of the unit operation is greatly improved.

Key words: coal fired power plant, circulating water system, cooling tower, expanded unite system, backpressure

CLC Number:

YU Bo, MING Jianpu. Research and Application of Expanded Unit Element System in Circulating Water Drainage System for Coal Fired Power Plant[J]. Electric Power, 2019, 52(3): 115-119.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711013

https://www.electricpower.com.cn/EN/Y2019/V52/I3/115

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