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| Design and abrasion of desulphurization pump for thermal power unit |
| Liu Jianrui, He Xiaoke, Liu Liangliang, Li Chang, Xiang Hongjie |
| (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract Geometric parameters of a desulphurization pump for thermal power plant such as impeller diameter, impeller outlet width, blade stagger angles, and pumping chamber were optimal designed based on the design method of two phase flow theory. The hydraulic performance and efficiency of the desulphurization pump had been improved by increasing the blade outlet width and chamber discharging diameter properly,and abrasion of the pump was reduced by decreasing the blade outlet angle. The three dimensional full flow field model was built based on Pro/E software, and the solid liquid two phase flow field of the desulphurization pump was calculated through CFD software Fluent 6.3 with Eulerian multiphase flow model. Abrasion mechanism of the two phase flow field was indicated. Wear of the flow passage components and the main wear parts were predicted according to numerical calculation and analysis of the solid volume concentration distribution in the desulphurization pump passage at design point. It can be concluded that main wear parts of the impeller are impeller inlet and outlet, pressure surface, front lines, and front shroud. A replaceable structure form of wear resisting lining board clearance self-compensation device in pumping chamber is designed, which ensures the pump to have higher efficiency and longer service life. Test of the pump performance show that the pump had reasonable structure, and the pump efficiency at design point is improved by 3.8%.
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Received: 21 March 2011
Published: 30 September 2011
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