电站循环冷却水系统多泵变速运行台数优选

Optimization of the Number of Multiple Pumps Variable Running Simultaneously in Cycle Cooling Water System in Power Plant

目前很多热电站中的循环冷却水系统多为母管制,故循环水泵运行方式的不同将直接影响到其能耗状况。为此,本文以2×50MW抽凝式供热机组配4台同型号离心式变速水泵组成、并以天然河流为冷却水源的循环冷却水系统为例,进行由水源水位变化引起的能耗为最小时所对应的泵的运行台数、转速、流量、扬程、效率变工况运行分析。该研究方法与所得结论也同样适用于具有类似状况的其它行业的供水系统。

At present,siderable number of cities,there are still quite a few power stations adopting small and medium-sized condensing heat-supply units with extraction for heat needs.As a result of the cooling water system adopting piping-main scheme circulating,the running methods of circulating pumps will directly affect the energy consumption of it.Taking 2×50MW condensing heat-supply units with extraction,four centrifugal variable-speed pumps of the same type and the natural rivers for cooling water-circulating cooling water system for example,This article will make an economic analysis of the number of running pumps,pumps＇ rotating speed,flux,equations of lift and efficiency when the energy consumption is the smallest caused by variable water level.Also it provides the reference frame to the enterprise of cogeneration with similar conditions for optimized operation.