摘要 针对典型的地下气化工艺，分析了煤地下气化“三带”发生的主要物化过程，得出煤地下气化过程中主要发生的氧化还原反应以及其动力学表征。 针对一小型煤地下气化炉实物进行合理的假设简化，就炉体微控制单元进行物料衡算与能量衡算得到炉体内部的温度场以及浓度场控制微分方程，并给出其边界、初始条件，进而建立起煤地下气化过程的数学模型。 运用不同的有限差分格式对数学模型进行求解，通过理论分析以及实际求解过程得出适合于该模拟的差分格式算法—校正预估差分格式算法，并对该算法的稳定性以及收敛性进行判定。 运用该模型对地下气化过程进行模拟，并与试验值相对照，看到该模型能够反映出气化炉体内的浓度场以及温度场的变化规律，可用于现场计算，指导实验与生产。模拟与试验均表明随着气化通道长度的增加，煤气热值增加， 温度升高，上升速率增大。因此，保证一个高温温度场和相对较长的气化通道有利于煤气热值的稳定和提高。

ABSTRACT The main chemical reactions with their kinetics models and physical transformations happened in UCG (Underground Coal Gasification) processes are got base on the study of typical underground coal gasification technique. As to a mini-type underground coal gasification experiment, proper assumptions are given . A coupled fields mathematical model of the experiment is created with its control partial differential equations and side conditions base on the study of material conservation and energy conservation. The mathematical model is solved with different formats on the base of finite difference method. With comparison of different formats in solving and theory analysis, it is concluded that the pre-estimate revise different format is efficient and suitable for the solution of this model. A simulation is processed base on the mini-type underground coal gasification experiment and the calculation value and the experiment value take on a good conformity. It is indicated that the model created can simulate the temperature field and concentration field of different materials in the underground coal gasification oven and the model can be used to guide the experiment and industry. Base on both the simulation and the experiment , it is concluded that with the increase of the gasification channels length the temperature of the oven and the concentration of the combustible coal gas increased, a high-temperature field and long gasification channel is make for the stabilization and increasing of coal gas.