带中间抽头给水泵变速运行分析

摘要

According to analysis method for similarity of the pump,the feed water pump with center tap was regarded as composed of high and low pressure parts in series.Based on field operational data,pipe equivalent characteristic curves with different valve openings and water pump performance curves with different rotating speeds were respectively drawn.Based on the principle of taking high pressure variable frequency as the main while medium pressure variable frequency being a-daptable to high pressure variable frquency,energy saving amount and adaptability of feed water pressure under ultimate variable frequency and different loads conditions was studied.Results indicate that the feed water pump could obtain about 30% energy saving amount with average load and most of working conditions could meet requirements for feed water system pressure,while it is suggested to promote frequency of the feed water pump if working conditions could not meet require-ments.%根据泵的相似性分析方法，把带中间抽头给水泵看作由高、低压两部分串联而成，利用现场运行数据，分别作出不同阀门开度下的管路等效特性曲线和不同转速下的水泵性能曲线；以高压变频为主，中压适应高压变频的原则，研究在极限变频条件及不同负荷下的节能量和给水压力适应性。结果表明：平均负荷下给水泵能获得30%左右节能量；大部分工况能够满足给水系统压力要求，当不满足时可适当提升给水泵频率。