【摘要】 以欧拉多相流模型为基础,气相采用k-ε湍流模型,固相采用基于颗粒动理学理论封闭模型,引入传热、传质、煤热解、气化过程反应模型,建立了流化床煤气化过程的三维数理模型,该模型同时考虑了稠密气固流动和相内、相间的化学反应.对直径0.22m的流化床煤气化炉不同操作参数下的气化过程进行了三维数值模拟,获得了气化炉内气化产物的组分分布、温度分布及化学反应速率变化规律.模型的计算结果与实验结果进行了比较,结果表明:数值模拟与实验吻合较好,最小相对误差仅为1%左右,最大相对误差为20%左右,平均相对误差小于14%.更多还原

【Abstract】 Based on the Eulerian multiphase fluid model,3D numerical models were established to simulate the coal gasification in fluidized bed.The gas phase was modeled with k-ε turbulent model and the particle phase was modeled with kinetic theory of granular flow.Submodels including heat transfer model,transfer model,species transport model and chemical reaction model were added to consider the dense gas-solid flow and chemical reactions in fluidized bed coal gasifier.Coal gasifications in a fluidized bed coal gasifier with diameter of 0.22 m were simulated.Composition profiles of gas product,temperature distribution of gas phase and chemical reaction rates under different operating conditions were obtained.Simulated results were compared with experimental values.The results show that numerical simulations are in well agreement with the experiments.The minimum relative error of simulation to the experiment is only 1%,the maximum relative error is about 20% and the mean relative error is less than 14%.更多还原