水泵并联在闭式循环水系统中的节能策略研究
Research on energy-saving strategies for parallel pumps in closed circulating water systems
摘要：
采用最小二乘法对水泵运行工况曲线和特性曲线进行了拟合,针对同型号水泵并联在小流量、加减泵切换时存在的低效问题,提出了采用大、中、小不同型号水泵泵组的解决办法。以并联泵组功耗之和最小为目标,建立了泵组优化组合模型,设定流量、扬程、转速比、高效区为约束条件,采用蜣螂优化算法求解泵组的节能方案。实例验证表明,在典型的闭式循环水系统中,冷水机组满负荷制冷量6 200 kW情况下,泵组运行流量为102～1 020 m3/h;采用大、中、小泵组合的不同型号并联泵组比常规同型号水泵并联泵组综合效率在10%～40%负荷率间提升5%～10%,一年可节电5 370 kW·h,全年节电率为5.3%。
Abstract：
The least square method is used to fit the operating condition curve and characteristic curve of the water pump.Aiming at the low efficiency problem that occurs when water pumps of the same type are operated in parallel under low flow conditions or during add/subtract pump switching,a solution using pump units of large,medium and small different types is proposed.Aiming to minimize the sum of power consumption of the parallel pump group,the optimal scheduling model of the pump group is established.Flow rate,head,speed ratio and high efficiency zone are set as constraint conditions,and the energy-saving scheme for the pump group is solved using the dung beetle optimization algorithm.Practical verification shows that in a typical closed circulating water system,under the condition that the full load cooling capacity of the water chiller is 6 200 kW,the operating flow of the water pump group is from 102 m3/h to 1 020 m3/h.Different types of parallel pump groups with large,medium and small pump combinations are compared with the conventional parallel pump groups of the same type,the comprehensive efficiency of the pump group is increased by 5% to 10% in the 10% to 40% load section,the annual power saving is 5 370 kW·h,and the annual power saving rate is 5.3%.
Keywords:water pump; parallel pump group; Simscape; closed circulating water system; physical model; optimization