摘要
以某煤矿14321综放工作面为研究对象,采用CCZ-20A型粉尘采样器,进行现场测试结合工业分析、红外光谱分析、激光粒度分析、润湿角分析等实验,分析“截—移—放”各个工序区域产尘质量浓度扩散规律及分布特征。结果表明:在截煤区域及架间区域顺、逆风截煤工序产尘呈现相似扩散规律,顺风截煤略大于逆风截煤,整体呈现先增大至峰值再迅速减小至稳定值的规律,质量浓度峰值出现在截煤机后滚筒处。移架工序产尘质量浓度呈现整体下降的趋势,随着距离增加,全尘下降趋势越来越大,呼尘下降趋势越来越小,最后趋于稳定值的规律,全尘质量浓度趋于18.33 mg/m^(3),呼尘质量浓度趋于7.78 mg/m^(3)。放煤工序整体产尘质量浓度呈现先上升后下降的趋势,尤其呼尘产尘量较为显著,质量浓度峰值出现在多口放煤区域后测点处,全尘峰值质量浓度为148.33 mg/m^(3),呼尘峰值质量浓度为94.5 mg/m^(3)。整体“截—移—放”工序区域内,煤样平均固碳量及挥发分总和为87.33%,具有高爆炸风险性,含有多种官能团结构,如—OH结构、芳香结构等,接触角平均58.7°,润湿性一般,架间区粒径尺寸,集中分布在0~31.829μm,放煤区煤样粒径,集中分布在0~56.835μm。研究为14321工作面防尘工作提供理论指导。
Taking the 14321 fully-mechanized top-coal caving face as the research object,this study investigated the dust diffusion migration laws and distribution characteristics during the"Cutting-Supporting-Caving"process through field measurements using a CCZ-20A dust sampler and laboratory analyses including industrial analysis,infrared spectroscopy,laser particle size analysis,and contact angle measurement.The results revealed that:dust generation during both downwind and upwind cutting exhibited similar diffusion patterns,initially increasing to a peak near the rear drum of the shearer before decreasing rapidly to a stable level;during supporting operations,dust concentrations decreased overall,with total dust stabilizing at 18.33 mg/m^(3)and respirable dust at 7.78 mg/m^(3);during multi-outlet caving,dust concentration first increased then decreased,peaking at 148.33 mg/m^(3)for total dust and 94.5 mg/m^(3)for respirable dust behind the caving area.Coal samples from the working area showed high explosibility risk,87.33%fixed carbon and volatiles,contained functional groups like-OH and aromatics,and exhibited moderate wettability,average contact angle 58.7°.Particle size distribution was finest between supports 0 to 31.829μm and coarser in the caving area 0 to 56.835μm.This study provides theoretical guidance for dust control in the 14321 working face.
作者
王治栋
邱进伟
Wang Zhidong;Qiu Jinwei(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Joint National-Local Engineering Research Center for Safe and Precise Coal Mining,Huainan 232001,China)
出处
《煤炭技术》
2026年第1期23-30,共8页
Coal Technology
基金
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1004104)
国家自然科学基金资助项目(52474170)。
关键词
综放工作面
粉尘运移
粉尘质量浓度
分布特征
fully mechanized top-coal caving face
dust migration
dust concentration
distribution characteristics
