单一煤层综放工作面采空区遗煤瓦斯涌出规律研究
Study on Gas Emission Law from Residual Coal in Goaf of Fully Mechanized Caving Face Under Single Coal Seam
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摘要: 单一煤层综放工作面采空区遗煤瓦斯涌出量的准确计算是现场瓦斯防治“分源治理”的基础工作。基于球向非稳态扩散理论，得出遗煤瓦斯涌出强度和涌出量计算公式；结合孔庄煤矿7354采煤工作面生产现状，对煤粒瓦斯涌出强度进行现场实测和可靠性验证，对采空区遗煤瓦斯涌出规律进行分析。结果表明，工作面支架后方10 m范围内是采空区遗煤瓦斯涌出量变化较大的区域，也是采空区瓦斯防治的重点部位；随着工作面产量的增加，遗煤的相对瓦斯涌出量略微下降，绝对瓦斯涌出量逐步增加；移架是影响采空区瓦斯动态涌出的主要生产工序，故移架期间要加强工作面瓦斯检查与监测。Abstract: Accurate calculation residual coal gas emission quantity in goaf of fully mechanized caving face is a basic field work for gas prevention and control based on "source management technology". According to sphere direction unsteady diffusion theory, the calculation formulas of gas emission intensity and quantity from residual coal in goaf were obtained. On the basis of production condition of 7354 caving face in Kongzhuang Mine, field measurement and reliability testing on coal particle gas emission were implemented, and the law of gas emission from residual coal in goaf was analyzed. Results showed that it is the most important area of gas emission exchange and prevention in 10 m range of working face bracket rear. The relative gas emission quantity slightly decreased and absolute gas emission quantity gradually increased with the increase of production. Moving frame is the main production process that affects the gas dynamic emission in goaf, so operators must strengthen gas inspection and monitoring during this period.
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Keywords:
- single coal seam /
- fully mechanized caving face /
- goaf /
- residual coa /
- gas emission /
- reliability testing
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