Analysis of Fluidization Quality in Oscillating Gas–Solid Fluidized Beds with Variable Diameter Structures

作者：Dan Zhang, Dewu Wang, Qinchuan Zhang, Xiaopei Yuan, Ruofeng Xu, Bin Zhao, Ruojin Wang, Shaofeng Zhang · 发表于：Processes · 年份：2025 · DOI：10.3390/pr13061778 · 被引用次数：4 · 研究领域：Granular flow and fluidized beds、Mining and Gasification Technologies、Mineral Processing and Grinding

In this study, the optimization of a gas–solid fluidized bed structure under oscillating conditions is carried out, and the traditional equal-diameter structure is improved to a variable-diameter structure. In this paper, a 300 mm diameter equal-diameter fluidized bed is taken as the benchmark model, and the research team uses numerical simulation to analyze the changing law of bubble size and the percentage of non-fluidized area. It is found that under the condition of the same gas volume, the “cone-contraction” fluidized bed with variable-diameter structure can reduce the bubble size by about 25% and the percentage of non-fluidized area by about 11%. The effects of the specific operating parameters are as follows: the operation of increasing the gas volume will lead to an increase in bubble size but will lead to a decrease in the percentage of non-fluidized area; the increase in the initial bed height will simultaneously increase the bubble size and the percentage of non-fluidized area; the increase in the amplitude of the oscillation will lead to an increase and then a decrease in the bubble size, and will lead to a continuous expansion of the percentage of non-fluidized area; and the change in the oscillation period will not have a significant effect on the two. A comparison of the experimental data shows that the overall performance of the variable-diameter fluidized bed is better than that of the equal-diameter fluidized bed, as shown in the following: the bubble size i...