硬软煤质量比变化对煤吸附甲烷的影响  

Effect of mass ratio change of hard and soft coal on adsorption of methane gas

作　　者：李树刚[1] 赵鹏翔[1] 林海飞[1] 潘红宇[1] 成连华[1] 

机构地区：[1]西安科技大学能源学院,陕西西安710054

出　　处：《采矿与安全工程学报》2013年第1期118-122,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174157;51104118);陕西省自然科学基础研究计划项目(2011JQ7015)

摘　　要：在单一煤体吸附甲烷的基础上,选用山西某煤矿同一进风巷硬软煤,按不同质量比进行分层混合。运用Langmuir单分子层吸附理论,对硬软煤处于不同质量比条件下混合煤样对其吸附特性的影响进行了实验研究。得出吸附量随硬软煤质量比变化的关系曲线、吸附常数a,b随硬软煤质量比变化关系式及瓦斯放散初速度ΔP随硬软煤质量比变化关系式,对瓦斯涌出受硬软煤质量比变化的影响进行了理论分析。分析结果表明软煤质量和其上部硬煤质量近似相等时,吸附常数a及放散初速度ΔP达到最大值,吸附常数b达到最小值。这一发现说明了在此情况下,煤对甲烷的吸附量及其压力均达到最大值,一旦扰动此类煤层,便会形成较大的压力梯度及浓度梯度,发生大量瓦斯涌出,研究结果对煤与瓦斯突出机理提供了理论基础。In this paper, based on gas adsorption by the single coal body, both the hard and soft coal samples were chosed in the same air-intaking entry of one mine in Shanxi, and the samples were mixed hierarchically according to different quality ratio. In addition, the influence of mixed samples on gas adsorption characteristics under different quality ratios of hard and soft coal bodies were studied in the laboratory, by using Langmuir single molecule layer absorption theory. Then, the curves of adsorption quantity variation, the variation equation of adsorption constants a, b, and the initial speed of methane emission △P, with different mass ratios of hard and soft coal bodies, were obtained. Moreover, the effect of mass ratios of hard and soft coal bodies on gas emission were further analyzed. The results show that the adsorption constants a and initial speed of methane emission △P reach the maximum values, and the constants b reach the minimum value when the quality of soft coal is approximately equal to that of the upper hard coal. It implies that the gas adsorption quality and pressure of coal body all achieve the maximum values in this condition, and once the coal seam has been disturbed, large pressure gradient and concentration gradient will be formed, and large amount of methane gas will blow out. The research results provide theoretical foundation for the mechanism of coal and gas outburst.

关 键 词：硬软煤质量比 吸附特性 吸附常数 瓦斯放散初速度 

分 类 号：TD712.6[矿业工程—矿井通风与安全]