摘要
本文旨在优化高瓦斯矿井的瓦斯治理,以余吾煤业S1205工作面为研究对象,采用数值模拟方法研究了U型、W型、U+高抽型和Y型四种通风方式下的瓦斯浓度分布规律。研究方法包括建立数值模型,确定采动裂隙煤岩的碎胀系数、渗透率和瓦斯质量源相等关键参数,运用FLUENT软件进行模拟分析。模拟结果表明,在U型和W型通风方式下,上隅角瓦斯浓度分别超过了1%和9.3%,无法满足安全要求。相比之下,U+高抽型通风方式在高抽巷负压为8 kPa时,有效降低了瓦斯浓度,其中回风巷瓦斯浓度保持在0.5%以下,上隅角瓦斯浓度降至0.8%以下。进一步分析高抽巷层位对瓦斯治理效果的影响,发现高抽巷层位在15~20 m之间时,能较好的控制回风巷瓦斯浓度。Y型通风方式虽然在理论上优于U+高抽型,但经济性较差。
In order to optimize the gas treatment of high gas mines,this paper takes the S1205 working face of Yuwu Coal Industry as the research object,and uses numerical simulation methods to study the gas concentration distribution under four ventilation modes:U-shaped,W-type,U+high-pumping type and Y-type.The research methods include the establishment of numerical models to determine the key parameters such as fragmentation coefficient,permeability and gas mass source phase of mining fractured coal and rock,and the simulation analysis is carried out by using FLUENT software.The simulation results show that the gas concentration in the upper corner exceeds 1%and 9.3%respectively under the U-shaped and W-shaped ventilation modes,which cannot meet the safety requirements.In contrast,the U+high-pumping ventilation mode effectively reduces the gas concentration when the negative pressure of the high-pumping roadway is 8 KPa,in which the gas concentration of the return air roadway is kept below 0.5%,and the gas concentration in the upper corner is reduced to less than 0.8%.Further analysis of the influence of the high extraction roadway layer on the gas treatment effect shows that when the high extraction roadway layer is between 15 m and 20 m,the gas concentration of the return air roadway can be better controlled.Although the Y-type ventilation method is theoretically better than the U+high-pumping type,it is less economical.
出处
《中国矿山工程》
2024年第6期42-48,共7页
China Mine Engineering
基金
中央高校基本科研业务费专项资金(2023ZKPYAQ04)
安徽省爆破器材与技术工程实验室(AHBP 2022A-03)。
关键词
综采工作面
通风系统
数值模拟
瓦斯治理
fully mechanized mining face
ventilation systems
numerical simulation
gas control
