高二氧化碳瓦斯水合物传热分解特性研究

Research on characteristics of decomposition and heat transfer for high carbon dioxide gas hydrate

为了探究煤体中高二氧化碳水合物的分解规律,根据Stefan热量传导方程和Clausius-Clapeyron方程,建立了开采煤层中水合物分解传热模型和高二氧化碳瓦斯水合物分解热计算模型;利用可视化水合物实验系统,测定了高二氧化碳瓦斯水合物相平衡参数;计算得出了高二氧化碳水合物的分解热并分析了影响水合物分解热的因素;通过设定条件,利用水合物分解传热模型得出了煤体中水合物分解规律,并分析了工作面温度、围岩温度对煤层中水合物分解速率的影响。计算结果表明,工作面温度对水合物分解影响较小,围岩温度对水合物的分解影响大。因此,通过对煤体中高二氧化碳瓦斯分区域水合固化,可以有效防止煤与瓦斯突出。

According to Stefan heat conduction equation and the Clausius-Clapeyron equation, the heat transfer model and heat calculation model of high carbon dioxide gas hydrate in coal are established in order to explore the decomposition rule of high carbon dioxide hydrate. Using visual hydrate experiment system, the phase equilibrium parameters of the high carbon dioxide gas hydrate are determined;decomposition heat of the high carbon dioxide hydrate is calculated and the influencing factors of hydrate decomposition heat is analyzed;the decomposition rules are obtained by heat transfer model of gas hydrates and set- ting conditions, also the effects of hydrate decomposition rate is analysised about temperature of coal face and temperature of surrounding rock. The calculation results show that the coal face temperature has little effect and the temperature of surrounding rock has great effects on the hydrate decomposition. So it can effectively prevent coal and gas outburst through hydrate curing the regional high carbon dioxide gas.