Abstract

The residence properties of gas-solid phases are important to the design and process optimization of a COREX shaft furnace. In this study, we investigated the gas-solid residence time distribution by using a coupled CFD-DEM model. The effects of the center gas supply device (CGD) on the average residence time, variance, and volume fraction of the gas and solid phases were analyzed. The results revealed that the average residence time, dispersed plug volume fraction, and well-mixed volume increased, while the variance and the dead volume fraction of the gas phase decreased for the shaft furnace with CGD. The average residence time and the dispersed plug volume fraction of the solid phase decreased in the shaft furnace with CGD. The dead volume fraction and well-mixed volume fraction increased with the introduction of CGD.

摘要

气固相的滞留特性对于 COREX 竖炉的设计和工艺优化很重要。在本研究中，我们使用耦合 CFD-DEM 模型研究了气固停留时间分布。分析了中心供气装置（CGD）对气相和固相的平均停留时间、方差和体积分数的影响。结果表明，采用CGD的竖炉平均停留时间、分散塞体积分数和混合体积增加，而气相的方差和死体积分数降低。使用CGD的竖炉中平均停留时间和固相的分散塞体积分数降低。随着CGD的引入，死体积分数和充分混合的体积分数增加。