水锁液浓度与环境温度对水锁效果影响的实验研究

Experimental study on influence of water lock solution concentration and environment temperature on water lock effect

为研究环境温度对含瓦斯煤体瓦斯解吸释放水锁阻碍效果的影响,以工作面割落的煤为研究对象,以合成醇聚氧乙烯醚磺酸钠为渗透剂,利用外液侵入条件下水锁实验装置,开展不同环境温度条件下不同质量分数水锁液侵入含瓦斯煤后瓦斯解吸释放实验,分析水锁液质量分数与环境温度对水锁效果的影响,并给出具体应用中渗透剂水锁液质量分数的选择过程。结果表明:在相同温度条件下,当水锁液的质量分数低于0.050%时,水锁液质量分数越高其水锁效果越好;而当水锁液的质量分数超过0.050%时,水锁液质量分数越高其水锁效果并不一定越好。对于同一质量分数的水锁液,当水锁液的质量分数低于0.050%时,环境温度越高其水锁效果越差;当水锁液的质量分数高于0.050%时,环境温度越高其水锁效果并不一定越差。工程应用中,水锁液质量分数的配制应综合考虑环境温度、工作面割落煤体在工作面的滞留时间等因素。

This paper is an attempt to investigate the influence of environment temperature on gas desorption and release in gas-bearing coal body after water lock. The investigation involves experiments on gas desorption and release following the invasion of gas-bearing coal by water lock liquid of different concentration under different environment temperature conditions by applications using the coal cut from working face as the research background,synthetic alcohol polyethenoxy ether sodium sulfonate as penetrant,and the water lock experimental device under the condition of external liquid invasion;and an analysis of the influence of mass fraction of water lock solution and ambient temperature on water lock effect,and a description of the concentration selection process of penetrant water lock solution in concrete application. The results reveal that,given the same temperature,the higher the mass fraction of water lock solution,the better the water lock effect,at a mass fraction of less than 0. 050% in water lock solution;a higher mass fraction of water lock solution does not necessarily give a better water lock effect at a mass fraction of more than 0. 050%;for the same concentration of water lock solution,a higher environment temperature means a worse water lock effect at less than 0. 050%;the higher environment temperature does not necessarily suggest a worse water lock effect at more than 0. 050%;and essential for the technique in which water lock is used to prevent gas from exceeding limits in working face,the compounding of water lock solution concentration necessitates a comprehensive consideration of the factors such as the environment temperature and the retention time of coal body in the working faces.