Discrete particle simulation of solid flow in a melter-gasifier in smelting reduction process
Discrete particle simulation of solid flow in a melter-gasifier in smelting reduction process
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DOI：
10.1016/j.powtec.2016.10.041
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发表时间：
2017-06
影响因子：
5.2
通讯作者：
Huiming Zhang;Zongyan Zhou;A. Yu;Sun-Young Kim;Suk-Kwang Jung
中科院分区：
文献类型：
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作者：
Huiming Zhang;Zongyan Zhou;A. Yu;Sun-Young Kim;Suk-Kwang Jung
熔融还原法具有降低成本、减少环境污染等优点，是一种很有发展前途的铁液生产技术。在该过程中，熔融气化炉（MG）主反应器内存在着复杂的多相流动和传热传质现象，其中固体流动起着主导作用。本文采用离散颗粒模拟的方法，研究了不同条件下，金属微珠中固体颗粒的流动行为。计算结果与实验结果吻合较好。结果表明，在微通道内形成了三个滞止区：一个位于微通道中心底部，另两个位于侧壁。分析表明，装药方式、MG几何形状和颗粒-壁面摩擦力是影响侧壁滞留区大小的因素。滚动摩擦对固体流动影响不大。颗粒尺度分析的固体流动和力的结构也进行了，显示出较强的力存在于低孔隙率的区域。颗粒质量分数分析表明，在MG上部，HCI（热压铁）颗粒占主导地位的MG中心，和煤颗粒倾向于分布到侧壁。
Smelting reduction process is one of the promising technologies that produce liquid iron with advantages in the reduction of costs and adverse effect on environment. In this process, the main reactor of Melter-Gasifier (MG) involves complicated multiphase flow, heat and mass transfer phenomena, in which solid flow plays a dominant role. In this work, the solid flow behavior in an MG is investigated by discrete particle simulation under different conditions. The results show a good agreement with the observations in experiments. It reveals that three stagnant zones are formed: one is at the MG central bottom, and the other two are located on the side walls. The analysis indicates that charging method, MG geometry, and particle-wall frictional force are factors affecting the size of the stagnant zones on the side walls. Rolling friction does not affect solid flow much. Particle scale analysis of solid flow and force structures is also conducted, showing that strong forces exist in the regions with low porosity. The analysis of particle mass fraction shows that at the MG upper part, HCI (hot compacted iron) particles dominate the MG center, and coal particles tend to distribute to the side walls.