基于计算流体动力学的煤炭地下气化过程数值模拟
Numerical Simulation of Underground Coal Gasification Process Based on Computational Fluid Dynamics
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摘要: 为了对煤炭地下气化过程产生的混合物气体组分进行有效分析，在一个给定的几何结构和煤块均匀分布条件下，采用计算流体动力学理论建立了一个固定床煤炭地下气化过程的三维数理模型。该模型中的反应器考虑了气固两相流动，并生成了离散化数值网格。采用气相运动k-ε湍流模型，利用ANSYS/Fluent软件对该模型的技术参数进行了分析。以定性和定量的形式对煤气化过程的气体组分（CH4 、CO2、CO和H2）进行了实验分析，结果表明：提出数值模型得到的组分计算值与实测值吻合较好，平均相对误差12.17%。此外基于获得的相关性系数验证了提出数值模型的适用性。Abstract: In order to effectively analyze the gas components of the mixture produced by the underground coal gasification process, a three-dimensional （3D） mathematical model of the underground gasification process of the fixed bed coal is established using the computational fluid dynamics theory under the uniform distribution of a given geometric structure and coal block. The reactor in this model considers gas-solid two-phase flow and generates a discrete numerical grid. The gas-phase k-ε turbulence model was used to analyze the technical parameters of the model using ANSYS/Fluent software. The gas components （CH4, CO2, CO and H2） in the coal gasification process were analyzed qualitatively and quantitatively. The results show that the calculated values of the components obtained from the numerical model agree well with the measured values, and the average relative error is 12.17%. In addition, the applicability of the proposed numerical model is verified based on the obtained correlation coefficient.
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