基于泵阀联合调节的并联离心泵组高可靠性优化  

Speed-throttling combined optimization for high reliability in parallel centrifugal pump system

作　　者：赖周年[1] 杨帅[1] 武鹏[1] 吴大转[1,2] LAI Zhounian;YANG Shuai;WU Peng;WU Dazhuan(Institute of Process Equipment,Zhejiang University,Hangzhou,Zhejiang 310027,China;The State Key Laboratory of Fluid Po-wer Transmission and Control,Hangzhou,Zhejiang 310027,China)

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]浙江大学流体传动及控制国家重点实验室,浙江杭州310027

出　　处：《排灌机械工程学报》2018年第12期1205-1210,1221,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51606165);中国博士后科学基金资助项目(2016M601939)

摘　　要：针对离心泵常见的"大泵小用"问题,在常规多泵PID变频供水系统的基础上,通过优化投入运行的离心泵的数量和适当关小控制阀的方法提出了1种可以在一定程度上改善离心泵偏工况问题的方法.搭建了1套3台离心泵并联泵组试验台,并进行了测试.试验结果表明,文中提出的方法能够以增加一定的能耗为代价,在一定程度上改善离心泵的偏工况运行情况,提高离心泵的可靠性.当偏工况情况过于严重时,采用控制阀调节工况点的方法将会大大增加管路阻力,牺牲大量的能源,使得此方法欠缺经济性.当取消控制阀的作用仅保留泵数优化时,文中方法能够同时实现节能和一定程度上改善偏工况程度,但整体偏工况程度依然较严重.实际工程中可结合具体应用中对能耗与可靠性的权重倾向进行合理选择.Centrifugal pumps are widely used in industries.Although many pumps are well designed with high efficiency,a large percent of them are operating at off-design points as a result of inapprop-riate pump selection and inefficient operations.Off-design operation makes the operation point of a pump deviate from the high efficiency zone around the design point and wastes a large amount of energy.Moreover,it decreases the pump reliability,makes the pump vulnerable to failures and may cause economic losses and accidents.To solve the pump off-design problems,a method was proposed to improve the reliability of pumps in a parallel pump system.The method introduced a pump number optimization scheme and a control valve to solve the off-design problems of centrifugal pumps based on the conventional PID speed regulation method.A three-pump water supply system was built to verify the proposed method.The results show that the proposed method improves the off-design point of centrifugal pumps.However,when the off-design deviation is too large,the proposed method will greatly increase the pipeline resistance and waste a huge amount of energy,which makes it uneconomic.If the control valve regulation is abandoned and only the pump number optimization scheme is kept,the proposed method can reduce energy consumption and partly solve the off-design problem,but the overall off-design problem remains serious.

关 键 词：离心泵组 泵可靠性 泵数优化 变频控制 泵阀联合调节 

分 类 号：S276.3[农业科学—农业水土工程] TQ051.1[农业科学—农业工程]