Binchang Mining Group Company Limited, Shaanxi Coal and Chemical Industry Group Corporation Limited

高瓦斯易自燃特厚煤层条件下,综放工作面同时面临瓦斯治理和煤层自然发火防治两大难题,以大佛寺煤矿为例,分析了瓦斯治理和煤层自然发火防治的影响因素以及两者之间的相互影响,通过综合使用通风系统调整、瓦斯抽采、减少采空区遗煤、加强采空区阻化和惰化、减少采空区漏风、加强采空区气体监测、加快工作面回撤速度等手段,使回撤期间工作面和回风巷瓦斯体积分数均不超过0.8%,监测点CO体积分数不超过50×10-6,有效兼顾了瓦斯治理和防灭火需要,保证了复杂条件下综放工作面的安全回撤。

Under the condition of high gassy and easy spontaneous combustion ultra thick seam, the fully-mechanized top coal caving mining face would have two big problems of the gas control and the spontaneous combustion prevention and control at the same time. Taking Dafosi Mine as a case, the paper analyzed the factors affected to the gas control and the spontaneous combustion prevention and control, and the mutual influence between the two. With the comprehensive adjustment of th e applied ventilation system, gas drainage, coal left reduced in the goaf, inhibition and inerting enhanced in the goaf, air leakage reduced in the goaf, gas monitoring an d measuring enhanced in the goaf, withdrawing speed of the coal mining face speeded up and other means, the gas volume fraction of the coal mining face and the air return gateway was not over 0. 8% during the equipment withdrawing period and the CO volume fraction at the monitoring and measuring points was not over 50 x 10- 6. Those effectively could meet the requirements of the gas control and the fire prevention and control, and ensure the safety equipment withdrawing from the fully-mec hanized top coal caving mining face under the complicated conditions.