破碎机下导料槽粉尘数值模拟及治理研究.pdfVIP

摘 要 随着选煤厂生产能力的增加，各个生产环节产生的粉尘量也与日俱增，给车间环境和 工人的身心健康带来严重影响。因此，对于选煤厂重点产尘部位的粉尘运移规律和浓度分 布进行研究具有重要的现实意义。 本文以选煤厂粉尘产生量比较大的破碎机下导料槽为研究对象，采用气固两相流理 论、受限空间与自由空间流体力学理论，研究粉尘粒子运动规律，通过理论研究和实验研 究的有机结合，获得破碎机落煤管和导料槽粉尘发尘机理，影响因素，利用 Fluent 流体力 学模拟软件获得落煤管和导料槽内部和外部空间粉尘扩散运移规律和浓度分布，获得不同 粒径粉尘粒子在落煤管和导料槽内部运动轨迹，为粉尘控制方案的选取，除尘设备的选型 提供了科学的依据。本文选取扁袋覆膜除尘器对导料槽内部粉尘进行处理，并模拟了除尘 后导料槽外部空间粉尘浓度分布。通过现场实测，证实了模拟结果与实测值的基本一致性， 上述研究方法和结论对于相似行业的粉尘治理具有一定的参考和借鉴作用。 关键词：粉尘；落煤管；导料槽；数值模拟；浓度分布 - I - Abstract With the increase of coal production capacity, the amount of dust has grown in the whole production process. This impacts great on the workshop environment and the physical and mental health of workers. So it is significant for research on coal dust migration regularity and the concentration distribution. In this paper, we focus on the crusher that produces a large amount of coal dust. Using the theories of gas-solid two-phase flow, limited space and free space fluid mechanics, we study the rules of the dust particle movement. We aim to draw dust diffuse mechanism in the crusher coal drop pipe and material guide device, and investigate the related Influencing factors by combining theory with practice. And we use the Fluent Fluid Mechanics Software to simulate dust diffusion migration rule and the concentration distribution in coal drop pipe and material guide device internal and external space. Finally we get dust trajectories of particles with different sizes in coal drop pipe and material guide device. Our observations provide scientific basis for the selection of the dus