煤炭地下气化干馏气渗流运动多场耦合数值模拟

基于传热，渗流力学及弹塑性力学理论，建立了气化煤体温度场，干馏气渗流场和煤体变形场耦合数学模型，研究发现，在煤炭地下气化过程中，因高温条件，煤体的物理力学参数不再是一个常数，而变为温度的函数，为了提高数值模型的精度，对相关的物理力学参数进行了标准化热趋势研究，根据有限元法原理，介绍了其耦合求解方法，并结合计算实例，对计算结果进行了分析，根据计算结果，非等温度条件下干馏气压实测值和模拟值之间的拟合情况明显好于等温条件下的拟合情况，且实测值高于理论值，计算值和实测值的一致性表明，对气化盘区温度场，渗流场及应力场的数值模拟是正确的。

Multi-Field Coupled Numerical Simulation of Dry Distillation Gas Seepage Moving in the Process of Underground Coal Gasification

Based on the theories of heat transmission, plasto elasticity and seepage flow mechanics, the coupled mathematical models of temperature field of gasification coal seam, seepage flow field of dry distillation gas, and deformation field of coal body are established. It is found that in the process of underground coal gasification, because of the high temperature effect, physico mechanical parameters are not constant any more but become a function of temperature. In order to increase the calculation accuracy, the standardized thermal tendency of the physico mechanical parameters are studied. The finite element method is used to solve the coupled models, and the calculated results are analyzed through a real example. According to the calculated results, compared with isothermal condition, the fitting degree of the measured values for dry distillation gas under nonisothermal condition is obviously better, and the measured values are higher than the theoretical ones. The agreement between the calculated and measured values indicates that the simulation are effective.