论文部分内容阅读
分析了气基直接还原竖炉还原段参数的影响因素,找到了各参数的研究方法;在模拟的气基直接还原竖炉还原氛围下进行了铁矿石的直接还原实验,研究了铁矿石的还原性和还原膨胀性;采用颗粒离散元仿真分析软件EDEM对颗粒炉料的传输过程进行仿真分析,研究了炉料的下降运动规律;结合实验数据和仿真结果,确定了竖炉还原段参数的表达式。研究结果表明:铁矿石在模拟条件下的必要还原时间约为3h,且还原膨胀率先增大后减小;竖炉中心炉料的下降速度大于边缘炉料的下降速度,且速度超前比受排料速度的影响较小;从上到下还原段内型曲线由3条拟合线段组成,对应的炉身角分别为:87.162°、88.949°以及90.652°。
The influencing factors of the reduction parameters of gas-based direct reduction shaft furnace were analyzed, and the research methods of each parameter were found. The direct reduction experiments of iron ore were carried out under the reduction atmosphere of the gas-based direct reduction shaft furnace, The reduction and expansion of the charge were analyzed. The particle dispersion element simulation software EDEM was used to simulate the transmission of the particle charge, and the descending motion of the charge was studied. Based on the experimental data and simulation results, the parameters of the reduction zone were determined formula. The results show that the necessary reduction time of iron ore under simulated conditions is about 3h, and the reduction and expansion rate first increases and then decreases. The descending speed of furnace charge at the center of the shaft is higher than that of the edge charge, The influence of velocity is small. The inner curve of the reduction section from top to bottom is composed of three fitting line segments with corresponding body angles of 87.162 °, 88.949 ° and 90.652 °, respectively.