| Summary: | The separation of gas in pulp is the prerequisite to realize pumping. In order to achieve the gas–liquid separation, a hydraulic structure of medium consistency pump was designed, and the parameters of exhaust on impeller were optimized by orthogonal test. Four factors were designed such as exhaust number, diameter of exhaust, radial distance, and circumferential position, and each factor has three levels. Nine projects were decided upon L 9 (34) orthogonal test. Based on studying the numerical simulation results of medium consistency pump model, the best project was selected after orthogonal test analysis and produced to test. The head, hydraulic efficiency, and gas–liquid separation efficiency are improved by 5%, 7%, and 20% comparing with the state before optimization at 0.8 Q , 1.0 Q , and 1.2 Q flow rate. The gas–liquid separation effect is particularly evident after optimization of the parameters of exhaust, which meets design requirement.
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