喷腾型分解炉内冷态流场的模拟与优化设计

为掌握分解炉内流场特性,应用标准k-ε双方程模型和SIMPLE方法对喷腾型分解炉内部三维湍流冷态流场进行了数值模拟与分析.重点分析了带旋流的三次风、柱体的尺寸和中部缩口对分解炉内气体流场特性的影响规律.研究表明:喷腾型分解炉内流场基本为喷射流,其物料的分散主要受轴向风的纵向作用.通过增加分解炉的高度、增设中部缩口和带旋流的三次风,气体运行迹线的长度因旋流效应、尺寸效应和二次喷腾作用而延长,从而增加了气流在分解炉的停留时间.

Numerical simulation and optimization of cold airflow field in sprayed calciners

In order to understand the flow characterstics in the precalciner,numerical simulation of cold airflow field in the sprayed calciner was conducted using standard k-ε model and SIMPLE method.The influences of the increasing middle-necking,the construction parameter of cylinder of calciner,and the flow velocity of tertiary air on turbulence flow field in the calciner were discussed compared with the airflow field of the originally designed case.The simulation results demonstrate that the airflow field in the sprayed calciner is sprayed flow,in which the dispersion of particles is controlled by the axial velocity.Moreover,the path line of airflow can be delayed due to the effects of swirl flow,size and the second spray after increasing the height of calciner and designing the middle-necking and the tertiary air,which can increase the stop time of airflow in the calciner to a certain extent.