【摘要】 分别采用离散传播辐射模型(DTRM)、基于球形谐波法的P1模型和罗斯兰德(Rosseland)模型对Texaco水煤浆气化炉激冷室下降管内的辐射换热进行数值模拟。探讨了合成气衰减系数在0．4～4范围内变化时,合成气与下降管内壁水膜的热质交换特性以及下降管内多相介质的轴向温度分布规律。将模拟结果与工业运行和实验结果进行比较,研究发现Rosseland模型模拟结果与实际吻合较好,下降管出口水温在500～600K,并且高温合成气温度降主要集中于下降管上半部分。应用Rosseland模型模拟下降管内的辐射换热过程具有一定的可靠性。更多还原

【Abstract】 In order to simulate the radiative heat transfer of vertical pipe in the quench chamber of Texaco coal slurry gasifie, the following radiative models were tested: discrete transfer radiation model(DTRM), P1 model based on spherical-harmonics method and Rosseland model. When the syngas attenuation coefficient was within the confines of 0.4 to 4, the heat and mass transfer characteristics and the temperature distribution along the axis of vertical pipe were discussed. By comparing the simulated results with the experimental results, it was found that the Rosseland model is in good agreement with the practice. The water temperature of the vertical pipe outlet is between 500K and 600K. Besides, the temperature drop of the syngas mainly concentrates on the top half of the vertical pipe. Thus the Rosseland model is more reliable than the discrete transfer radiation model(DTRM) and the P1 model in simulating the radiative heat transfer of vertical pipe.更多还原