Abstract In order to develop the central gas flow in COREX shaft furnace, a new installment of center gas supply device (CGD) is designed. In this work, a coupled DEM–CFD model was employed to study the influence of CGD on gas–solid flow in COREX shaft furnace. The particle descending velocity, particle segregation behaviour, void distribution and gas distribution were investigated. The results show that the CGD affects the particles descending velocity remarkably as the burden falling down to the slot. Particle segregation can be observed under the inverse ‘V’ burden profile, and the influence of CGD on the particle segregation is unobvious on the whole, which causes the result that the voidage is slightly changed. Although the effect of CGD on solid flow is not significant, the gas flow in shaft furnace has an obvious change. Compared with the condition without CGD, in the case with CGD, the gas velocity is improved significantly, especially in the middle zone of the furnace, which further promotes the center gas distribution. Meanwhile, the pressure drop in the furnace with the installation of CGD is increased partly.

中文翻译：

---

基于DEM-CFD模型的中心供气装置对COREX竖炉气固流动的影响

摘要 为开发COREX竖炉中心气流，设计了一种新型的中心供气装置(CGD)。在这项工作中，采用耦合 DEM-CFD 模型来研究 CGD 对 COREX 竖炉中气固流动的影响。研究了颗粒下降速度、颗粒分离行为、空隙分布和气体分布。结果表明，CGD 显着影响颗粒下降速度作为负载下降到槽。在反“V”型负载剖面下可以观察到颗粒偏析，CGD对颗粒偏析的影响总体上不明显，导致空隙率略有变化。虽然CGD对固体流动的影响不显着，但竖炉内的气体流动却发生了明显的变化。与没有CGD的情况相比，在有CGD的情况下，气体速度显着提高，特别是在炉膛中部，进一步促进了中心气体分布。同时，安装CGD后炉内压降部分增加。