多因素影响表面活性剂喷淋煤体抑制瓦斯解吸实验研究
Experimental study on the influence of multiple factors on gas desorption of coal sprayed with surfactant
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摘要: 采动条件下，煤矿采煤工作面原始应力的改变在不同程度上加剧了原始吸附态瓦斯的解吸和游离态瓦斯的扩散与渗流，引发瓦斯超限等影响煤矿安全生产的事故隐患。为有效降低煤矿工作面局部瓦斯浓度，采用向特定高浓度瓦斯区喷淋表面活性剂的方式抑制瓦斯解吸，模拟了煤矿井下喷淋表面活性剂溶液抑制瓦斯解吸的工况，研究在通风条件下，表面活性剂溶液的质量分数和煤体粒径对瓦斯解吸的影响，揭示了实际煤尘环境下喷淋表面活性剂对不同粒度煤体瓦斯解吸的抑制效果；根据井下可能存在瓦斯超限的工作面概况，自主研发了表面活性剂喷淋煤体抑制瓦斯解吸实验台，经表面张力和沉降实验测定优选了润湿性能较好的溶液进行不同表面活性剂溶液质量分数和煤体粒径对瓦斯解吸的影响实验研究。研究结果表明：当表面活性剂溶液质量分数达到0.40%时，5种溶液中辛癸基葡萄糖苷APG溶液的临界表面张力为26.96 mN/m，煤粉沉降时间为18.19 s，表征其润湿性最好；当喷淋质量分数为0.01%APG~0.50%APG溶液时，不同质量分数的APG溶液与瓦斯浓度峰值呈一阶指数函数关系；当溶液质量分数达到一定程度时，其含氧基团的面积百分比随着溶液质量分数增大而趋于稳定；当喷淋质量分数为0.40%APG溶液且煤体粒径在2.80~30.00 mm之间时，粒径与测点瓦斯浓度峰值呈负相关关系，但衰减速度随粒径增大呈快速降低-缓慢降低-快速降低的渐变趋势。Abstract: Under mining conditions, the change of original stress in coal mining face aggravates the desorption of original adsorbed gas and the diffusion and seepage of free gas to varying degrees, which leads to accidents affecting coal mine safety production such as gas overrun. In order to effectively reduce the gas concentration in working face or local area of coal mine, the method of spraying surfactant to specific high concentration gas area is used to inhibit gas desorption. In order to simulate the working condition of inhibiting gas desorption by spraying surfactant solution in coal mine, the effects of mass fraction of surfactant solution and coal particle size on gas desorption under ventilation conditions were studied, and the inhibitory effect of spraying surfactant on gas desorption of coal with different particle sizes under actual coal dust environment was revealed. According to the general situation of working face where gas overrun may exist in underground coal mine, an experimental platform for inhibiting gas desorption by spraying surfactant coal was independently developed. The solution with good wettability was selected by surface tension and settlement experiments. The effects of different mass fractions of surfactant solution and coal particle size on gas desorption were studied. The results showed that when the mass fraction of surfactant solution reached 0.40%, the critical surface tension of octadecyl glucoside APG solution in the five solutions was 26.96 mN/m, and the settling time of coal powder was 18.19 s, indicating that its wettability was the best. When the spray mass fraction is 0. 01% APG - 0. 50% APG solution, the APG solution with different mass fractions has a first-order exponential relationship with the peak gas concentration. When the solution mass fraction reaches a certain degree, the area percentage of oxygen-containing groups tends to be stable with the increase of solution mass fraction. When the spray mass fraction is 0.40% APG solution and the coal particle size is between 2.80 mm and 30.00 mm, the particle size is negatively correlated with the peak gas concentration at the measuring point, but the attenuation rate decreases rapidly, slowly and rapidly with the increase of particle size.
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Keywords:
- surfactant solution /
- spray /
- coal particle size /
- gas desorption /
- peak of gas concentration
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