This dust is likely to cause occupational pneumoconiosis: a disease that seriously affects the health of coal miners and even makes them to prematurely lose their working ability, eventually causing serious economic losses and adverse effects on human society at country scale (Cai et al., 2019, Nam et al., 2020, Zhang et al., 2021 Peng et al., 2022a, Peng et al., 2022b). During high-speed cutting head operations, and especially when coal lumps are cut off, a large amount of explosive and polluting dust is produced (Li and Jiang, 2003 Nie et al., 2022b, Nie et al., 2022c, Nie et al., 2022f, Nie et al., 2022h). Finally, the entropy weight method was applied for determining the ideal mine ventilation system scheme and, hence, improve safety production in coal mines during sub-regional cutting dust production.ĭuring tunneling, due to the restrictions imposed by the cutting range, the cutting arm of a roadheader has to swing in order to reach and cut different zones of the coal walls (Deshmukh et al., 2020, Ma et al., 2020 Liu et al., 2022). The optimal Q e (575 m 3/min) was determined based on the weight of the different zones. Under the ventilation system, the overall distribution of dust in the tunnel could be roughly divided into three sections: the dust removal section (I), the dust blocking section (II), and the gentle section (III). The research results showed that: the dust distribution was jointly affected by the cutting unit and the completed cutting zone moreover, the dust control effect was better in the middle cutting zones than in the others. According to the dust concentration values registered at different locations, the entropy weight method was applied to quantitatively analyze the dust absorption effect of the fan.
Based on the actual production situation, computational fluid dynamics technology was used to study the distribution characteristics of an airflow–dust mixture for different air-absorption volumes ( Q e ) of the ventilation system during sub-regional coal cutting. Optimizing the tunnel ventilation scheme is one of the main ways to achieve safe production in coal mines.
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