一机一泵组合的冷却水泵工作区与变频运行分析
Analysis of cooling water pump working zone and variable frequency operation of one-pump-one-chiller combination
摘要：
根据深圳前海10号制冷站区域供冷系统,建立了一机一泵组合的冷却水系统水力计算模型,包括共享的总管+冷却塔压降模型,以及各支路的压降模型。针对不同运行模式,得到了水泵工作区;结合水泵变频特性曲线,得到了每个水泵工作区不同流量对应的水泵运行频率范围,可用于水泵变频控制,简化水泵运行控制策略。本文提出的水泵工作区还可用于水泵选型,校核水泵在所有工况是否运行在高效区。
Abstract：
Based on Qianhai DCS Plant No.10 in Shenzhen, a hydraulic calculation model is developed for the one-pump-one-chiller combination cooling water systems considering the shared pressure drops of the shared main pipe and cooling towers, and the individual pressure drops of the pump branches. According to different operation modes, the pump working zones are obtained. Combined with the frequency conversion characteristic curve of the pump, the pump frequency operation zone is obtained corresponding to different flows in each pump working zone, which can be used for the frequency conversion control of the pump, and the pump operation control strategy is simplified. The pump working zone proposed in this paper can also be used for pump selection to check whether the pump is running in the high efficiency zone under all the operation conditions.
Keywords:district cooling system; one-pump-one-chiller combination; hydraulic calculation model; pump working zone; pump frequency operation zone; pump selection