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Numerical Simulation Study on the Influence of the Bar Angle on Pulp Flow Parameters in Refining Zone of the Straight Bar Plate
Received:December 28, 2020  
DOI:10.11980/j.issn.0254-508X.2021.05.010
Key Words:disc refiner  isometric straight bar plate  bar angle  pulp flow  numerical simulation
Fund Project:国家自然科学基金(50745048);陕西省重点研发计划项目(2020GY-105)。
Author NameAffiliationPostcode
YANG Ruifan College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
DONG Jixian College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
LIU Huan College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
QI Kai College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
DUAN Chuanwu College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
XING Yuhang College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an Shaanxi Province 710021 710021
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Abstract:Bar angle is one of the most important parameters of the straight bar plate, which will directly affect the pulp flow and the refining quality during low consistency refining. In this study, Fluent software was used to simulate the pulp flow state in the refining zone of isometric straight bar plate. The influence of the bar angle on the average velocity at the outlet, the pulp flow in gap clearance of the plates and grooves were analyzed. The quality and efficiency of pulp refining by straight bar plates with different bar angles were speculated by considering both experimental data and the results of simulation. It was found that the velocity of outlet and grooves increased with the increase of bar angle, and the larger bar angle of refining plates could reduce the spiral motion of the pulp in refining zone. Thereby while the output increased, the refining quality decreased. Thus, the fiber residence time, flow parameters in the refining zone, and the pulp quality could be adjusted by reasonable design of bar angle.
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