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在对爆破烟尘源及其特征分析的基础上,以西石门铁矿南二采区为研究背景,运用Fluent软件通过气固两相流数值模拟方法对爆破后粉尘的分布及扩散规律进行研究,得出在现有条件下爆破粉尘的运移规律。采场爆破后很快产生大量粉尘且浓度较高,粉尘的运移受风流流场影响较为明显。在现有通风条件下,粉尘的净化主要靠重力沉降,而难以沉降的呼吸性粉尘的排出则需要较长时间。这不利于生产,亟须改善通风条件或采取其他措施较快速降低爆破粉尘浓度。数值模拟结果与现场测量结果基本一致,爆破产尘量大,排尘耗时久。
Based on the analysis of blasting soot sources and their characteristics, taking the second mining area of Shekimen Iron Mine as a research background, the distribution and diffusion of dust after blasting were studied by numerical simulation of gas-solid two-phase flow using Fluent software. Under the existing conditions blasting dust migration rules. Stope blasting quickly produce a large number of dust and high concentrations of dust migration by the wind flow field is more obvious. Under the existing ventilation conditions, the dust purification mainly depends on the gravity sedimentation, while the exhaustion of the difficult-to-settle respiratory dust takes a long time. This is not good for production, there is an urgent need to improve ventilation or take other measures to reduce the concentration of blast dust more quickly. The results of numerical simulation are consistent with those of on-site measurement. The amount of dust produced by blasting is large, and the dust discharge takes a long time.