瓦斯水合物在含煤表面活性剂溶液中生成影响因素

Influence factors of mine gas hydrate formation in surfactant solution containing coal

为促进瓦斯水合物快速生成以预防煤与瓦斯突出,利用可视化实验系统,进行了14.3～25.4 ℃和18.66～26.70 Mpa条件下三种含煤表面活性剂溶液体系中瓦斯水合物生成过程的实验研究,得到了生成过程的p-T-t关系.结合水合物生成速度和含气率等计算模型对实验数据进行了计算,并对计算结果和实验过程进行了分析.结果表明：表面活性剂的加入缩短了水合物生成诱导时间,提高了生成速度和含气率,合成的水合物样品含气率达到136～150;多孔介质（煤）的存在对水合物的生成有较小的延缓;记忆效应对瓦斯水合物生成影响显著,在拥有水合物分解残余五面体环等结构的实验体系中,水合物生成诱导时间缩短10～20倍.

In order to promote mine gas hydrate formation quickly, which can prevent coal and gas outburst, the processes of gas hydrate formation in three reaction systems containing coal were investigated by utilizing the visible experimental installation under the condition of 14.3 - 25.4 ℃ and 18.66 - 26.70 MPa, and the correlations among pressure, temperature and time were obtained. Experimental data were analyzed based on the computation models of formation rate and volumetric proportion. The results show that the addition of surfactant shortens induction time and improves formation rate and volumetric proportion, and the volumetric proportion of synthetic hydrate samples can amount to 136-150; the existence of porous medium （coal） delays hydrate formation exiguously; the influence of memory effect on gas hydrate formation is notable, the induction time could be shortened by 10- 20 times for the experimental system containing residual pentahedral ring structure.