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| 基于 CFD-DEM方法的高炉回旋区气固运动行为及形貌特征研究 |
| Research on gas-solid movement and morphological characteristics of the blast furnace raceway based on CFD-DEM method |
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| DOI： |
| 中文关键词: CFD-DEM耦合 高炉 风口回旋区 形貌特征 气固作用 |
| 英文关键词: CFD-DEMcoupling blastfurnace racewayzone morphologicalcharacteristics gas-solidinteraction |
| 基金项目:国家自然科学基金项目( 52104340)；湖北省重点研发计划项目( 2022BCA058)；宝钢股份科技专项( 23K002QSLT). |
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| 中文摘要: |
| 本文以某 3200 m3高炉为对象建立等比例三维局部数学模型，采用 CFD-DEM耦合算法分析了风口回旋区形成过程中鼓风空气和焦炭颗粒的运动行为，并研究了鼓风量和风口直径对稳态回旋区形貌特征的影响。结果表明，风口回旋区在形成过程中，高速热风与焦炭颗粒进行剧烈的动量交换，随着鼓风冲击深度的增加，气流末端速度减弱，气流向阻力较小的风口上方发展，回旋区空腔结构初步形成。空腔内部空隙率较高，料层阻力较小，回旋区附近气流趋向于沿回旋区边界流动并发展为涡旋状流场，部分焦炭颗粒在回旋区边界做高速运动。此外，提高风口鼓风量和减小风口直径均会显著增加稳态回旋区在高度和深度方向上的尺寸，空腔的截面形状也由圆形逐渐转变为类似羽毛状的椭圆形。 |
| 英文摘要: |
| A 3-D mathematical model has been established based on the partial region of a 3200 m3 blast furnace with real dimensions. The dynamic behaviors of blast air and coke particles during the raceway formation process were analyzed using CFD-DEM coupling simulation. The effects of blast air volume and tuyere size on the morphological characteristics of stable raceway have also been studied. The simulation results showed that during the formation of raceway，the momentum exchange between the high speed blast air entering the blast furnace and the static coke particles packed inside the blast furnace occurred. With the increase of the blast impact depth，the blast kinetic energy was gradually weakened and the air flow started to turn towards the above-tuyere zone which had less gas resistance. Meanwhile，the prototype of raceway formed，in which the void fraction was relatively higher and the coke layer resistance was relatively lower. As a result，the blast air near the raceway zone tended to move along the raceway’s boundary and then gradually formed into a vortex flow field，and partial coke particles moved around the raceway’s boundary at high speed. As the blast air blowing proceeded，the loading force acting on the coke particles and the air-particle interaction force reached a balance，and the raceway morphology finally became stable. Furthermore，the simulation results also showed that increasing the blast volume can significantly increase the size of raceway zone in both depth and height directions and the raceway morphology changed from circular shape to plume-like shape. Enlarging tuyere size would decrease the blast kinetic energy and hence reduce the blast impact depth and the raceway zone height. |
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