【摘要】 根据动量、质量及能量守恒原理和地下气化过程的特点,建立了煤炭地下气化过程中温度场和浓度场数学模型。介绍了主要模型参数的确定方法,采用控制容积方法对数值模型进行了求解,并在模型实验的基础上,对计算结果进行了分析。结果表明,从温度场分布来看,计算值略高于实验值,各测点相对误差基本在10％以内;根据模拟计算,随着气化时间的延长,煤气热值逐渐提高,因此,实验值与计算模拟值显现出良好的一致性;在高温区,煤气组分浓度场实验值的变化梯度大于计算值。更多还原

【Abstract】 A mathematical model on temperature field and concentration field in the process of underground coal gasificaton was established based on the principles of conservation of momentum, mass and energy and the features of gas production process. The methods of determining the main model parameters was introduced, the numerical model was solved by means of the control volume method, and the calculation results were analyzed. The result shows that the calculation values are slightly higher than the ones actually measured. The relative differentiations of all measuring points are within 10%. According to the simulation, the heat value of coal gas increases with the gasifying time. So, the test values are in good accordance with the simulation ones. In the high temperature zone, the variation gradient of measured values for concentration field of gas compositions is greater than that of calculated ones.更多还原