Study on the Application of Roots-Water Ring Pump in Large Direct Air-Cooling Power Plant ACC System

doi:10.11930/j.issn.1004-9649.201806040

Abstract

Abstract: In order to solve the problem of cavitation of the electric water ring vacuum pump used in thermal power plants, through the test on the vacuum system output of a 600-MW direct air-cooling unit, this paper proposes that there exists the maximum suction output in the water ring pump operation, and analyzes the reasons why the output may decrease. Then the cavitation of the water ring pump is also investigated associated with the issue of water ring pump rotor cracks. Based on the study, a front dewatering roots-water ring pump group system is designed. By taking the test data and the pump group selection theory into account, an alternative scheme for the existing pump group is put forward, which can effectively tackle the problem and remarkably save the energy.

Key words: thermal power plant, direct air-cooling unit, water ring pump, cavitation, air leakage rate, isothermal compression, pressure ratio, conductance

CLC Number:

AN Yajun, ZHANG Zhiyong, CHEN Ruijun, SUN Jian, ZHAO Ziyuan, SHEN Mengling. Study on the Application of Roots-Water Ring Pump in Large Direct Air-Cooling Power Plant ACC System[J]. Electric Power, 2018, 51(11): 32-37.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201806040

https://www.electricpower.com.cn/EN/Y2018/V51/I11/32

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