竖炉内颗粒、空隙率及气流分布模拟

为研究布料操作对竖炉内颗粒、空隙率及气流分布的影响,基于离散单元法(DEM)建立挡板布料器三维模型,分别计算分析不同挡板角度和料线高度下颗粒分布及空隙率分布,并评估其对气流分布的影响。结果表明,颗粒分布情况无法直接反应空隙率分布。当挡板角度为80°时,空隙率分布最均匀。料线高度对空隙率及颗粒分布的影响小于挡板角度的影响,随着料线高度增加,空隙率更均匀,但颗粒分布变化很小。当挡板角度为75°和80°时,有利于控制心部气流,而当挡板角度为82.5°和85°时,有助防止边部气流过度发展。适当增大料线高度,可使气流分布更均匀。

Numerical simulation of burden,porosity and gas distributions inside shaft furnace

In order to obtain effect of the changing operation on the burden,the porosity and the gas distributions inside the shaft furnace,a three-dimensional model is established based on the discrete element method(DEM). The effects of the flap angle and the stock line on burden ,porosity and gas distributions in the shaft furnace are investigated and calcu-lated by the model. The results show that the porosity distribution can not be directly reflected by the particle distribu-tion. The porosity distribution is the most homogeneous when the flap angle is 80°. The effect of the stock line on the po-rosity and the particle distributions is smaller than that of the flap angle. With the increase of the stock line,the porosity distribution is more uniform,but the change of the particle distribution is insignificant. The flap angle is recommended to be 75° or 80° to control the central gas flow and be 82.5° and 85° to prevent the peripheral gas from over developing. The gas flow can be more uniform if the stock line is properly increased.