煤炭地下气化三维非稳定对流扩散的数学模型

研究了煤炭地下气化气体对流扩散的基本特征，在模型试验的基础上，通过对气化发生炉体内煤层燃气化过程中流体浓度场分布和变化规律的分析，建立了三维非稳定对流产扩散模型，阐述了主要模型参数的选取方法，采用上游加权多单元均衡解法对数学模型进行了求解，并对模拟计算结果进行了分析和讨论，计算值和实测值基本相符合，证明了对气化炉内浓度场的数值模拟是可靠的，研究结果为进一步对煤炭地下气化过程进行了定量研究，奠定了必

Mathematical Model of Three Dimensional Unsteady Convective Diffusion in Underground Coal Gasification

The basic characteristics of gas convective diffusion of underground coal gasification (UCG) are studied. On the basis of model experiment,the three dimensional unsteady mathematical model is established by analyzing the distribution and pattern of flow body concertration field in the process of UCG within gasification stove. The selection method of main model parameters has been explained.The upstream weighted multi cell balance method was used to solve the mathematical model, and simulation results are analysed and discussed. The predicted results are basically in accordance with the experimented data,indicating that the numerical simulation for the comcentration field in the gasification furnace is reliable. Research achievements established a necessary theoretical foundation for further quantitative study on the process of UCG.