Abstract：Gas and coal are associated, which is a major hazard source in coal mining operation, and the cost of treatment is high. Using gas to generate electricity is one of the effective ways to reduce the cost of coal mining and improve the economic benefits of coal production enterprises. In the gas power generation project of Xinneng Coalbed Methane Power Generation Branch of Shanxi Huayang Group Co., Ltd., there is a problem of small horse-drawn cart in the actual operation of No.3 and No.4 desuperheating pumps ( multi-stage centrifugal pumps ) in the central heating station. In order to solve this problem, through the comparative analysis of several transformation schemes, the scheme of reducing the pump impeller is finally determined to be used for transformation, and the number of pump impellers required to be reduced is calculated. The practical results show that after the transformation, the multi-stage centrifugal pump runs in the normal working condition interval, and the steam supply and temperature reduction control of the heat exchange station is good, which ensures the safe and stable operation of the steam supply system of the heat exchange station.
