储料仓焦炭烘干水汽迁移数值模拟

采用多孔介质模型,进行了储料仓焦炭烘干气流组织数值模拟,研究了不同送风方式和不同送风位置下储料仓内焦炭的水汽迁移规律,分析了其对烘干效果的影响。结果表明,进风短管采用径向送风方式可扩大送风口面积,气流在料堆内分布比轴向送风更加均匀;随着送风口位置下移,气流扩散范围更大、速度分布更加均匀;在靠近送风口附近,物料阻力小,气流易扩散至该区域,水分脱除效率高、效果佳。结果成功应用于南钢3号高炉热风炉低温烟气余热直接烘干焦仓内焦炭的工程项目,取得了较好的焦炭烘干效果。

Water vapor migration numerical simulation of coke drying in storage bin

A porous media model was used to numerical simulated the water vapor migration of coke drying in the storage bin. The law for water vapor migration of coke in storage bin under different air supply methods and positions was studied and the influence of it on the drying effect was investigated. The results showed that the radial air supply method for inlet short tube could expand the area of air supply opening, and the distribution of airflow in the pile was more uniform than that of the axial air supply mode. As the position of air supply opening moved downward, the airflow diffusion range was wider and the airflow velocity distributed more uniform. The material resistance at the air inlet was small and the heat source gas was easy to diffuse to this area, at which the moisture removal efficiency was high and the removal effect was good. The results of this study had been successfully applied to the project of directly coke drying in the coke bin with the waste heat of low-temperature flue gas for No.3 blast furnace hot blast stove and had achieved positive results in Nanjing Steel Company.