Abstract The top gas recycling-oxygen blast furnace (TGR-OBF) is a reasonable method used to reduce both coke rate and energy consumption in the steel industry. An important feature of this process is shaft gas injection. This article presents an experimental study on the gas–solid flow characteristics in a TGR-OBF using a two-dimensional cold model. The experimental conditions and parameters were determined using a series of similarity criteria. The results showed that the whole flow area in the TGR-OBF can be divided into four distinct flow zones, namely, the stagnant zone, the plug flow zone in the upper part of the shaft, the converging flow zone and the quasi-stagnant flow zone, which is similar to that in a traditional blast furnace. Then the effects of batch weight and the ratio (X) of the shaft injected gas flow rate to the total gas flow rate on solid flow behaviour were investigated in detail. With the increase in batch weight, the shape of the stagnant zone tends to be shorter and thicker. Furthermore, with the increase in X value from 0 to 1, the stagnant zone gradually becomes thinner and higher. The results obtained from the experiments provide fundamental data and a validation for the discrete element method–computational fluid dynamics-coupled mathematical model for TGR-OBFs for future studies.

中文翻译：

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炉顶煤气循环氧气高炉固体流动行为的降尺度冷模型

摘要 炉顶煤气循环氧气高炉（TGR-OBF）是钢铁行业降低焦化率和能耗的合理方法。该工艺的一个重要特征是轴气注入。本文使用二维冷模型对 TGR-OBF 中的气固流动特性进行了实验研究。使用一系列相似性标准确定实验条件和参数。结果表明，TGR-OBF整个流动区可划分为四个不同的流动区，即滞流区、竖井上部的塞流区、汇流区和准滞流区。区，类似于传统高炉中的区域。然后详细研究了批次重量和轴注入气体流量与总气体流量的比率（X）对固体流动行为的影响。随着批次重量的增加，滞留区的形状趋于变短变厚。此外，随着 X 值从 0 增加到 1，停滞区逐渐变薄和变高。从实验中获得的结果为未来研究的 TGR-OBF 的离散元方法 - 计算流体动力学 - 耦合数学模型提供了基本数据和验证。