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| Speed-throttling combined optimization for high reliability in parallel centrifugal pump system |
| LAI Zhounian1, YANG Shuai1, WU Peng1, WU Dazhuan1,2* |
| 1.Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.The State Key Laboratory of Fluid Po-wer Transmission and Control, Hangzhou, Zhejiang 310027, China |
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Abstract Centrifugal pumps are widely used in industries. Although many pumps are well designed with high efficiency, a large percent of them are operating in 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.
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Received: 13 February 2017
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