Abstract
The study got two modified blades by changing the structure and shape of the rotor blade of the pressure screen. Pulp flow field in the same condition is numerically simulated by the fluid dynamics software FLUENT. The pressure distribution is showed especially in the location of the sieve drum circle. The ideal blade structure is obtained by the pressure field compared with conventional blades. It has strong cleaning ability and not easy to blockage sieve drum. The shape of the rotor blade is optimized. The blade shape is analyzed to the influence law of energy consumption. It is proved that the new rotor has energy-saving advantages. It is significant to improve the performance of pulp screening equipment. The theoretical support for select of blade shape of bars is provided by analysis of flow field.
Highlights
Pressure screen is a kind of pulp screening equipment
Analysis model of the flow field of the rotor blades: To HB1 screen as the research object, due to the geometry shade of the rotor on the entire rotor height unchanged, speed remains the same, the pressure difference inside and outside of the sieve drum is substantially unchanged and the density of the pulp is only from 0.4 to 1.2%, its density, viscosity, fluidity are approximated with water, the water will be used to simulate the calculation of the flow field, so the entire height of the pulp is the same
The distribution of pressure formed by the traditional rotors in the pulp is simulated by FLUENT, the whole pressure cloud and the pressure-curve formed in the surface of the sieve drum are obtained
Summary
Pressure screen is a kind of pulp screening equipment. The rotor (Chen, 2006) is an important part of the pressure screen and plays a key role in the pulp screening process, the front of the rotor blades promote the pulp producing tangential velocity, and put pressure on the sieve drum, increasing the pressure difference of the sieve drum’s internal and external. Analysis model of the flow field of the rotor blades: To HB1 screen as the research object, due to the geometry shade of the rotor on the entire rotor height unchanged, speed remains the same, the pressure difference inside and outside of the sieve drum is substantially unchanged and the density of the pulp is only from 0.4 to 1.2%, its density, viscosity, fluidity are approximated with water, the water will be used to simulate the calculation of the flow field, so the entire height of the pulp is the same.
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