Hao Tianxuan, Wang Lei, Wang Zehua, Li Fan, Jiang Wan, Jiang Shan
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo 454003, China.
ACS Omega. 2023 Oct 13;8(42):39143-39153. doi: 10.1021/acsomega.3c04251. eCollection 2023 Oct 24.
The dust in the breathing zone of the fully mechanized mining face poses a serious threat to the lives and health of the workers, and clarifying the distribution and settlement pattern of the dust in the breathing zone is an important foundation for reducing dust concentrations in the breathing zone and improving the workers' working environment. The dust concentration distribution at the mining face and the settlement results of different dust particle sizes along the breathing zone were analyzed in detail using a combination of computational fluid dynamics simulation and downhole measurements by establishing a highly simulated 3D solid model of the 2302 fully mechanized mining face at the Xinqiao coal mine. The study's findings reveal that dust from advanced support and coal-cutting processes converge within 20-60 m of the coal mining region, generating a high-concentration pollution zone at the height of the sidewalk breathing zone. The particle size of dust in the breathing zone is primarily concentrated between 1 and 40 μm, and the fully mechanized mining face is split into a rapid settling area, a medium settling area, and a slow settling area based on particle size settling speed. Eddy currents in the return airway lead to an increase in dust particles of 20-40 μm in the breathing zone area. The results of the study can provide a theoretical basis for dust management at the fully mechanized mining face for the breathing zone area.
综采工作面呼吸带内的粉尘对工人的生命健康构成严重威胁，明确呼吸带内粉尘的分布与沉降规律是降低呼吸带粉尘浓度、改善工人作业环境的重要基础。通过建立新桥煤矿2302综采工作面高度仿真的三维实体模型，结合计算流体动力学模拟与井下实测，详细分析了采煤工作面的粉尘浓度分布以及不同粒径粉尘沿呼吸带的沉降结果。研究结果表明，超前支护和割煤过程产生的粉尘在采煤区域20 - 60 m范围内汇聚，在人行道呼吸带高度处形成高浓度污染区。呼吸带内粉尘粒径主要集中在1 - 40μm之间，综采工作面根据粒径沉降速度划分为快速沉降区、中等沉降区和缓慢沉降区。回风巷中的涡流导致呼吸带区域内20 - 40μm的粉尘颗粒增多。该研究结果可为综采工作面呼吸带区域的粉尘治理提供理论依据。
