瓦斯水合物生成控制因素探讨

Discussion on the control factors of forming gas hydrate

提出了向煤层中注入高压水(含增溶瓦斯的表面活性剂),使瓦斯和水生成固态水合物,达到防止煤与瓦斯突出的目的.探讨了在煤层中瓦斯水合物生成的控制因素,并通过实验观察分析了瓦斯水合物生成和分解的特性.到目前为止,通过改变表面活性剂种类和浓度,生成实验已实现在环境温度为22.7℃时、瓦斯压力为23.2MPa生成了瓦斯水合物;在实验中测得甲烷水合物分解速度为2.8×10-2m3/h,远小于煤层瓦斯的解吸速度.可见,一般矿井(非高温)利用瓦斯水合作用防治瓦斯事故在技术上是可行的,但还有大量基础研究工作要做.

Put forward the idea of preventing coal and gas outburst to make gas and water form the solid hydrate by infusing water (containing the surfactants to solubilize gas) to the coal seams at middle or high pressure. Discussed the control factors forming hydrate in coal seam, and analyzed the characteristic of gas hydrate formation and decompose by experiment observe.Up to now, the decompose rate of methane hydrate measured in experiment is 2.8×10 -2 m 3/h,and that is much less than the desorption rate of gas in coal seam.By means of the change of surfactant kinds and concentration, the gas hydrate may have formed on condition that the environment temperature is 22.7 ℃, and the gas pressure is 23.2 MPa.It is obvious that it is feasible technically to adopt gas hydration to prevent gas accident in common coalmines, but a lot of basic research work still need to be done.