摘要
在煤矿开采中,回采工作面落煤时的瓦斯大量涌出常常导致工作面瓦斯超限频繁,针对回采工作面的瓦斯超限问题,采取降压解吸的方法分别进行了无外液侵入、质量分数为0.0%渗透剂溶液(即纯水)和质量分数为0.025%JFC渗透剂溶液侵入条件下瓦斯解吸对比实验,获得了瓦斯解吸实验数据和曲线。结果表明:无论有无外液侵入,含瓦斯煤体的瓦斯压力越大,瓦斯解吸量越大;与无外液侵入煤样相比,有外液侵入煤样在不同压力点下的瓦斯解吸量都有不同程度的降低,特别是喷洒0.025%的JFC渗透剂的瓦斯解吸量降低效果更好;实验验证了渗透剂能在短时间内形成对煤瓦斯解吸的水锁封堵效果。可结合实际通过抽采+水锁或采前向煤体注液形成水锁的方法来抑制瓦斯释放量和瓦斯释放速度,进而解决回采工作面存在的瓦斯超限问题。
In coal mining, a large number of gas emission during coal dropping always results in gas overflow at working face. As for gas overflow at working face, this study applies depressurization desorption method to conduct gas desorption comparative experiments under the circumstance that there is no extracellular fluid invasion and the penetrant solution（ namely pure water） has 0.0% mass fraction and under the circumstance that JFC penetrant solution with mass fraction of 0. 025% is injected ,further obtaining gas desorption experimental data and curves. The results showed that：with or without extracellular fluid invasion, the larger the pressure of the gas containing coal gas is, the more the gas is desorbed; compared with the case of no extracellular fluid invasion, gas desorption volume of the coal sample which is invaded by extracellular fluid is reduced to some extent at different pressure points, especially reduced more when the coal is sprayed JFC penetrant solution with mass fraction of 0.025 %. The experiments demonstrated the penetrant could realize the water lock effect against the coal gas desorption within a short time. According to the actual situation, the method of drainage and water lock or the method of injecting fluid into the coal for formation of water lock can be used to suppress the gas release volume and speed, further solving the gas overflow problem at the working face.
出处
《西安科技大学学报》
CAS
2014年第4期396-401,共6页
Journal of Xi’an University of Science and Technology
关键词
采煤工作面
瓦斯超限
水锁
瓦斯解吸
渗透剂溶液
coal working face
water lock
gas exceeding limit
gas desorption
penetrant solution
作者简介
通讯作者：王占立（1986-），男，河南周口人，硕士，E-mail：wangzhanli23@126．com
