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| Influence of back blade on wear of heavy slurry pump under low flow condition |
| PENG Guangjie1,2*, ZHOU Guoxin1, HU Ziqiang3, ZHOU Hong2 |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Hunan Special Pump Engineering Technology Research Center, Changsha, Hunan 410100, China; 3. Jiangxi Naipu Mining Machinery and New Materials Co. Ltd., Shangrao, Jiangxi 334000, China |
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Abstract Considering the wear caused by the application of heavy slurry pump operating under conditions deviating from design conditions, the Particle model was used to simulate the transport of high-concentration slurry in the heavy slurry pump and the experimental verification was carried out. The influence of the front and back blades of the impeller on the local wear of the heavy slurry pump with throttle design under the low flow condition was analyzed. The results show that the internal flow field of slurry pump with throttle design is more unstable than that of slurry pump under the low flow condition. The head drops by 3%-10%. The front and back blades have little effect on the particle volume fraction distribution inside the jacket, but have significant effects on particle slip velocity. When a heavy slurry pump with the front and back blades operates under low flow conditions, the slip velocity of solid particles at the interface between jacket and rotor near the tongue will increase sharply. It will cause serious local wear and seriously affect its service life. The removal of the front and back blades can effectively reduce the particle slip velocity at the interface to reduce wear. However, the removal of the front blades will also lead to backflow increase in the front cavity, which will increase the vortex intensity in the front cavity. As a result, the wear of the inner side of the front guard plate is aggravated.
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Received: 10 October 2018
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