离心泵的流量调节与节能控制

利用自行开发的离心泵性能测定平台，考察了IHG32-125型离心泵的出口阀调节、单泵及双泵变速调节、定速泵与变速泵组合操作等不同方式的调节特性及能耗损失，并进行了对比研究。实验发现，对于单泵，当输送量由5.8m³/h降至4.7m³/h时，变速调节能耗仅为阀门调节能耗的62%；对于双泵，当输送量由10m³/h降至7m³/h时，双泵变速调节能耗为阀门调节能耗的46%，为定速泵与变速泵组合操作调节能耗的61%。因此利用变频技术而实现的变速流量调节的方式节能效果最为显著，且经济可行。

Flow control of a centrifugal pump and its energy-saving operation control

Different ways of controlling the flow in a centrifugal pump and the associated energy consumption under a constant flow, including outlet valve control, single pump control, double-pump frequency conversion control and a combination of fixed-frequency pump and variable-frequency pump control, have been experimentally investigated. The results show that for a single pump, the energy consumption of variable-frequency control is 62 % of that of outlet valve control when the flow is decreased from 5.8 m3/h to 4.7 m^3/h; for double pumps, the former is only 46% of the latter, and is 61% of that of a combination of fixed-frequency pump and variable- frequency pump control when the flow is decreased from 10 m^3/h to 7 m^3/h. It is therefore concluded that using frequency conversion technology to convert the speed of a pump gives the best performance and the lowest energy cost, irrespective of the number of pumps.