综掘工作面粉尘污染演化数值计算及综合除尘系统研究

打开文本图片集

中图分类号：TD714.4 文献标志码：A

Abstract：Existing studies on the dust transport pattern in fuly mechanized excavation faces mostly focus on simplified conditions or short roadways，with insuficient simulation research on long-distance，full-scale working faces containing complex equipment.Dustcontrol is often limited to optimizing a single dustremoval technology， lacking an integrated control scheme that combines source suppresion and ventilation-based dust control.To address these problems，a full-scale geometric model of an excavation face in the Gongwusu Coal Mine was established to numerically simulate dust pollutionand diffusion in underground fully mechanized excavation faces.Acomprehensive dust removal system composed ofa high-efciency foam atomization dust suppression device and anew self-dividing wal-attached air duct was developed.The synergistic effect of sourcecapture and ventilation control was employed to enhance dust removal efficiency. Numerical simulation results showed that the dust distribution was related to the airflow direction. Because a large amount of airflow passd through the dust-producing area， the dust-laden airflow moved toward the roadheader area， causing high dust concentration near the roadheader. Over time， high-concentration dust nearly difused throughout the entire working face，and the average dust concentration at the end of the roadway reached 105.9mg/m3 . In the breathing zone，high dust concentrations formed on both sides of the walkway，seriously poluting the breathing environment of underground workers.Field application results showed that the total dust and respirable dust removal efficiencies of the comprehensive dust removal system were 86.6%89.7% and 86.6%88.3% ，respectively，significantly reducing the dust concentration in the roadway excavation site and improving the working environment of longdistance fullymechanized excavation faces.

Key words： fully mechanized excavation face； dust polution evolution; airflow transport pattrn; comprehensive dust removal system; high-efficiency foam atomization dust suppression device; new self-dividing wall-attached air duct

0引言

综掘工作面作为煤矿机械化掘进的核心作业区域，其粉尘污染问题呈现高浓度、持续性特征[1-4]。（剩余14345字）