In order to prevent the occupational hazards and dust explosion accidents caused by the exceeding of dust concen-tration in the grinding operation,according to the theory of gas-solid two-phase flow,the movement model of grinding dust in the processes of projection,diffusion and settlement was established. Taking the grinding area of stamping shop in a certain company as example,the numerical simulation of dust concentration distribution was carried out by using Fluent software and compared with the field measured data. It showed that the simulation results were basically consistent with the measured da-ta. The wind flow in the grinding area was turbulent,and there existed the eddy zone and no wind zone,which was unfavor-able to the decontamination and dust removal. The dust concentration at the height of respiratory zone above the grinding ta-ble was higher,reaching the highest value of 9.12 mg/m3,and the individual dust prevention measures should be adopted. In the corridor passage area between two grinding tables,the dust concentration decreased sharply,reaching the lowest value of 5.32 mg/m3. According to the frequency and duration time of the occurrence of dust cloud in the simulation results,the grinding operation area was determined to be 20 zone,and the preparation area was determined to be 21 zone.%为了预防打磨作业粉尘浓度超标而引起的职业危害和粉尘爆炸事故,依据气固两相流理论,建立打磨粉尘在抛射、扩散及沉降过程中的运动模型;以某公司冲压车间打磨区为例,运用Fluent软件进行粉尘浓度分布数值模拟,并与现场实测数据对比分析.研究结果表明:模拟结果与实测数据基本吻合;打磨区内风流紊乱,存在涡流区和无风区,不利于净化除尘;打磨台上方呼吸带高度粉尘浓度较高,最高达到9.12 mg/m3,应采取个体防尘措施;在2打磨台之间的走廊通道区域,粉尘浓度急剧下降,最低达到5.32 mg/m3;根据模拟结果中粉尘云出现的频繁程度和持续时间,将打磨作业区划分为20区,备料区划分为21区.
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