大采长综放面瓦斯治理优化模拟实验

Optimum Simulation of Methane Control for Super-Length Fully Mechanized Top-Coal Caving Face

针对大采长综放面瓦斯含量不断超限问题，以相似理论为基础，研制了瓦斯综合治理优化实验系统，首次提出了双尾巷新方案.对单尾巷、双尾巷在不同位置和不同进风量等实验条件下进行了实验，考察了回风流和内错尾巷的瓦斯含量变化情况.实验表明：大采长综放面在本煤层不采取瓦斯预抽放前提下，仅采用单尾巷和增加风量的措施无法解决瓦斯超限问题;如果采用双尾巷，总风量仅增加15%左右即可解决瓦斯超限，并从安全性和经济性两个方面确定其最佳布置位置分别为距回风巷35-65 m和130 m.

Aiming at the problem of methane concentration exceeding limit in the super-length fully mechanized top-coal caving face, an optimizing experiment system of methane control was designed and manufactured and based on the similitude theory and a new scheme of adopting double tail galleries was proposed for the first time. The experiment of single gallery and double galleries were carried out under conditions of different positions and air deliveries and the methane concentration in return airflow and gallery wind was observed. The results show that the problem of methane concentration exceeding limit can not be solved if we only use a single gallery or increase air delivery for the super-length fully mechanized top-coal caving face without any pre-pumping the methane. However, this problem can be well solved by increasing only about 15% of air delivery if the double galleries are used. The optimal positions which are about 35-65 m and 130 m from return laneway are determined considering both safety and economy factors.