含煤体系瓦斯水合物相平衡测定与分解热计算  

Determination of phase equilibrium and calculation of dissociation heat of mine gas hydrate in coal-bearing system

作　　者：吴强 韩慧明 刘传海 陈冉 张保勇 赵子琪 王维维 WU Qiang;HAN Huiming;LIU Chuanhai;CHEN Ran;ZHANG Baoyong;ZHAO Ziqi;WANG Weiwei(Department of Safety Engineering,Heilongjiang University of Science&Technology,Harbin,Heilongjiang 150022,China;National Central Laboratory of Basic Research of Hydrocarbon Gas Transportation Pipeline Safety,Harbin,Heilongjiang 150022,China)

机构地区：[1]黑龙江科技大学安全工程学院,黑龙江哈尔滨150022 [2]瓦斯等烃气输运管网安全基础研究国家级专业中心实验室,黑龙江哈尔滨150022

出　　处：《中国矿业大学学报》2023年第6期1108-1118,共11页Journal of China University of Mining & Technology

基　　金：国家自然基金联合基金项目(U21A20111);国家自然科学基金项目(51704103);黑龙江省博士后面上项目(LBH-Z22247,LBH-Z20189);基本科研业务费项目(2020-KYYWF0679)。

摘　　要：随着煤矿开采深度的增加,煤与瓦斯突出事故频繁发生,采取有效措施预防煤与瓦斯突出灾害发生是国家煤炭能源战略所需.煤介质中瓦斯水合物相平衡值与分解热值是基于水合物法防治煤与瓦斯突出的重要参数.利用瓦斯气体水合物相平衡试验装置研究CH4水合物与CO_(2)水合物在4种粒径(C1:0.425~0.850 mm,C2:0.250~<0.425 mm,C3:0.180~<0.250 mm,C4:0.150~<0.180 mm)煤介质中相平衡条件,得到4种粒径煤介质中CH4水合物与CO_(2)水合物相平衡参数曲线,将其与Chen-Guo模型理论预测值比较,并基于Clausius-Clapeyron方程计算了CH4水合物与CO_(2)水合物在4种粒径煤介质中的分解热.结果表明:4种粒径煤介质中瓦斯水合物相平衡条件存在一临界值,低于此临界值,相平衡热力学条件随着粒径的减小而趋于温和,高于此临界值,相平衡热力学条件随着粒径的减小变得更加苛刻;CH4水合物完全分解所需要的平均分解热随着煤介质粒径的减小而逐渐增加;除C1粒径外,CO_(2)水合物完全分解所需要的平均分解热随着煤介质粒径的减小而逐渐增加,CO_(2)水合物平均分解热均小于CH4水合物的平均分解热,CH4水合物在煤介质中的稳定性相比于CO_(2)水合物更高,分析认为利用水合固化机理防治煤与瓦斯突出在富含CH4的煤层中应用效果更好.With the increase of coal mining depth,coal and gas outburst accidents occur frequently,and it is necessary for national coal energy strategy to take effective measures to prevent coal and gas outburst disasters.Mine gas hydrate phase equilibrium value and dissociation heat value in coal media are important parameters for coal and gas outburst prevention based on hydrate method.The phase equilibrium conditions of CH_4 hydrate and CO_(2) hydrate in four types of particle size coal media(C1:0.425~0.850 mm,C2:0.250~<0.425 mm,C3:0.180~<0.250 mm,C4:0.150~<0.180 mm)were studied by using mine gas hydrate phase equilibrium experimental apparatus,and the phase equilibrium parameters curves of CH_4 hydrate and CO_(2) hydrate in four types of particle size coal media were obtained,which were compared with the theoretical predicted values of Chen-Guo model,and the dissociation heat of CH_4 hydrate and CO_(2) hydrate in four types of particle size coal media were calculated based on the Clausius-Clapeyron equation.The results show that a critical value of phase equilibrium conditions for mine gas hydrate in the four particle size coal media,below which the phase equilibrium thermodynamic conditions tend to be milder as the particle size decreases,and above which the phase equilibrium thermodynamic conditions become more severe as the particle size decreases.The average dissociation heat required for the complete decomposition of CH_4 hydrate gradually increases as the particle size of coal media decreases.Except for C1 particle size,the average dissociation heat required for complete decomposition of CO_(2) hydrate gradually increases with decreasing particle size of coal media,and the average dissociation heat of CO_(2) hydrate is smaller than that of CH_4 hydrate,and the stability of CH_4 hydrate in coal media is higher than that of CO_(2) hydrate.The analysis suggests that the use of hydration curing mechanism to prevent coal and gas outburst is more effective in coal seams rich in CH_4.

关 键 词：煤与瓦斯突出 瓦斯水合物 多孔介质 相平衡 分解热 

分 类 号：TD712[矿业工程—矿井通风与安全]