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| Numerical simulation and experiment on gas-liquid separation in medium consistency pulp pump |
| YE Daoxing1, LI Hong2, ZHANG Xiang1 |
| 1.Key Laboratory of Fluid and Power Machinery, Ministry of Education, School of Energy and Environment, Xihua University, Chengdu, Sichuan 610039, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to investigate the characteristic of gas-liquid separation in medium consistency pulp pump(MC pump), the Eulerian-Eulerian model was used to simulate unsteady gas-liquid separation. The effects of rotational speed, vacuum degree and flow rate on gas-liquid separation and transient gas-liquid separation process were analyzed. A MC pump test bed was established using sonar flowmeter, and operation performance was studied. The results show that high gas volume fraction is concentrated in the back of blade in turbulence generator and gas in the impeller decreases with speed increasing. The region area of high gas volume fraction decreases gradually with flow rate increasing, and gas is concentrated in the back blade root of turbulence generator at a large flow rate. The further separation was done by back blade of the impeller. Increasing rotational speed, vacuum degree and flow rate can improve separation effect. Lots of gas is concentrated on discharge port of the impeller, which is accompanied with strong interaction of gas-liquid two phases. The study on performance experiment shows that improving rotational speed and vacuum degree is helpful to gas-liquid separation, and the results of simulation are verified. Study on the characteristic of gas-liquid separation is helpful to understanding the evolution mechanism of separation process in MC pump and can provide design reference for the structure of gas-liquid separation and degas system.
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Received: 14 December 2015
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