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Analysis and optimization of operation mode of outlet communication valves for circulating pump in cold season

The circulating cooling water system of a coastal power plant adopts a unit seawater supply system. Each unit is arranged with three circulating water pumps. The operating mode of the circulating water pump in the cold season is two for operation and one on standby. If a running circulating water pump trips due to a fault, the standby pump will be activated by interlocking; meanwhile, an opening or closing command will be issued to the two outlet communication valves. According to the state of the outlet communication valve, the risks such as overpressure, condenser vacuum, water hammer, and pump reversal are analyzed. In order to reduce the possible risks in the cold season, an optimization scheme is proposed for keeping the outlet communication valves fully open. The feasibility of the optimization scheme in terms of flow distribution and pipe and equipment stability is also analyzed. The outlet communication valve optimization scheme will reduce operational risk and ensure the safe and stable operation of the circulating water system. The optimization scheme provides reference and experience feedback for the follow-up circulating water system design and operation.