In the whole process of pulping and papermaking, many kinds of pumps are needed, such as pulp pump, feed pump, boiler feed water pump, pipeline pump, metering pump, liquid pump, sewage pump, vacuum pump and so on. As a main type of slurry conveying machinery, centrifugal pulp pump plays an important role in the pulp and paper mill.

The pulp flow is a gas liquid solid three-phase flow, flow mechanism is complex, many factors affect the flow mechanism, such as slurry type, concentration, flow velocity, beating degree, temperature and fiber morphology can have an influence on the slurry flow, the flow of motivation has not been studied in depth of pulp. At present, the pulp pump research in China is still on the basis of the clean water pump, and is corrected according to the flow characteristics of pulp, and then verified by experiment.

1. classification of pulp pump

The pulp flow has the following characteristics: (1) as the raw materials of pulp of fibrous, easy to form flocs knot, so that the material is separated into spherical or sheet material, thus preventing the pipeline flow of the mixture, especially long fiber and high concentration slurry pump, easy to plug; (2) the content of air rises, pumping the ability to significantly reduce, the existence of air bubble effect on pulp pump performance is very bad.

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