采用粒子追踪技术的盘磨机微观磨浆机理研究

Micro Mechanism of Pulp Refining of Disc Refiner Based on Particle Tracking Technique

关键词:  盘磨机  磨浆机理  粒子追踪  齿形优化  数值仿真

Key Words:disc refiner  refining mechanism  particle tracking  profile optimization  numerical simulation

摘要:采用有限元数值分析中的粒子追踪技术，通过模拟追踪微观纤维粒子在磨浆区域的运动，对盘磨机的微观磨浆机理进行了系统研究，通过改变磨齿数量和磨齿形状，对比分析了直磨齿与弯曲磨齿、少磨齿与多磨齿的情况下浆料纤维的微观流动特性，验证了齿形对纤维流动特性产生的影响。有限元分析仿真表明，纤维在磨浆区域呈絮聚状分布，采用多螺旋弯曲磨齿可以增加浆料纤维在磨区中的停留时间，提高打浆质量，但会增加盘磨机的功耗。

Abstract:Disc refiner is the key equipment of pulp and paper industry, due to the high speed, high temperature and high pressure environment of disc refiner, it is difficult to observe the fiber flow state in the refining zone with experimental method, and the research of refining mechanism becomes the difficult point of pulping and papermaking process. Aiming at the present situation of the fiber flow characteristics in disc refiner is difficult to detect, fiber particle trajectories in the rotation process were tracked and the micro mechanism of disc refiner was systematically studied by using the finite element analysis method of particle tracking. The effect of plate pattern on the fiber flow characteristics was verified and the flow characteristics of pulp under the conditions of straight bar, curve bar, less bar and more bars were compared and analyzed by changing the number and the shape of the bar. It was found that the fibers were flocculation in refining area. The residence time in refining zone of pulp fibers would increase therefore the refining quality improve when using spiral or curve bass，while the power consumption of disc refiner also increased. This paper provided a new approach for the study of the refining mechanism and lay the foundation for the optimization of the disc refiner's profile.