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装料模式决定了料床的孔隙度结构,进而决定了煤气流的分布信息。建立了气化炉炉料结构的离散单元模型和煤气流动的多孔介质模型,以自编程和软件Fluent为载体,结合两个模型共同描述了不同加焦方式对气化炉的炉料结构和煤气流动带来的变化,获得了炉内炉料结构的孔隙度分布信息和煤气的速度场、流线和质量通量。结果表明:首先,由离散单元模型获得的炉料结构信息可作为气流分布模型的边界条件输入;其次,煤气流模型的模拟结果表明焦柱的加入会在加焦位置处形成煤气发展通路,进而改善气化炉透气性,但应控制焦炭加入量,避免气流过度发展,进而影响煤气利用率。通过模拟计算获得的非均匀床层气体流动规律的认识对气化炉加焦工艺有借鉴意义。
The charging mode determines the porosity of the material bed, which in turn determines the distribution of the gas flow. The discrete element model of gasifier charge structure and the porous media model of gas flow were established. The self-programming and software Fluent were used as a carrier. The two models were used to describe the different charging modes of gasifier charge structure and gas flow band To obtain the porosity distribution information of the furnace charge structure and the gas velocity field, streamline and mass flux. The results show that: firstly, the structure information of the charge obtained from the discrete element model can be input as the boundary condition of the airflow distribution model; secondly, the simulation results of the coal gas flow model show that the addition of the coke column will form the gas development path at the focus position, Gasifier gas permeability, but should control the amount of coke to avoid excessive development of gas flow, thus affecting gas utilization. The understanding of the law of non-uniform bed gas flow obtained through simulation calculation has reference significance to the gasification furnace cokemaking process.