Movement simulation of hematite ore dust in human respiratory tract

doi:10.16265/j.cnki.issn1003-3033.2022.12.1095

Abstract

Abstract:

In order to reveal the movement rule of hematite mine dust in the human respiratory tract, a three-dimensional model of oral and bronchial human body complete respiratory tract was established by ANSYS software. Using the ore dust sample of a open pit hematite as the research object, this study would provide theoretical basis for occupational protection of iron ore dust. The movement and deposition rule of hematite ore dust in the respiratory tract of workers with different labor intensity was simulated by discrete phase model. The results show that dust deposition is affected by the particle size of dust and the labor intensity. The deposition rate of ore dust with particle size greater than 1 μm increases with the increase of particle size and labor intensity. The mineral dust above 5.21 μm deposits in respiratory tract, and the deposition rate of pharynx is more than 85%. The mineral dust mainly deposits at the back of throat and at the trachea vortex. The greater the labor intensity, the greater the deposition at the back of throat, and the lower the deposition rate in the trachea. With the increase of particle size, the deposition rate of ore dust in the trachea first increases and then decreases. The escape positions are mainly the bronchus of the lateral lower part of the left lower lobe and the bronchus of the lateral lower part of the right lower lobe.

Key words: hematite ore dust, human respiratory tract, labor intensity, deposition rate, numerical simulation

LIAO Huimin, SU Hong, ZHU Yilong, LI Ming. Movement simulation of hematite ore dust in human respiratory tract[J]. China Safety Science Journal, 2022, 32(12): 165-173.

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编号	名称	编号	名称
1	左主叶G₁-1	8	左上叶内侧底段G₃-2
2	右主叶G₁-2	9	左下叶外侧低段G₃-3
3	左上叶G₂-1	10	左下叶内侧底段G₃-4
4	左下叶G₂-2	11	右下叶内侧底段G₃-5
5	右下叶G₂-3	12	右下叶外侧底段G₃-6
6	右下叶G₂-4	13	右上叶内侧底段G₃-7
7	左上叶外侧底段G₃-1	14	右上叶外侧底段G₃-8

项目	名称	参数设定
计算模型设定	能量方程	关闭
计算模型设定	离散相模型	打开
边界条件设定	入口直径/mm	30
	入口边界类型	速度入口
	轻度劳动强度入口速度/(m·s^-1)	0.707
	中度劳动强度入口速度/(m·s^-1)	1.061
	重度劳动强度入口速度/(m·s^-1)	1.414
	入口对粉尘反应	逃逸
	出口边界条件	自由出流
	出口对粉尘反应	逃逸
	呼吸道内壁	捕捉
粉尘源参数设定	喷射源类型	面尘源
	释放颗粒总数/个	11420
	粒子密度/(kg·m^-3)	5.15 ×10³
	粉尘初始速度/(m·s^-1)	0