摘要：High-density particles are commonly used in fluidized bed reactors in uranium recycling processes of nuclear industry, where high fluidization quality (i.e. low gas-solids contacting efficiency) is difficult to achieve, resulting in various problems such as reduced conversion, low product selectivity, stronger equipment vibration and bad operating stability, etc. The objective of this study was to validate the feasibility and advantages of a multistage fluidized bed in processing a super-high-density powder. Wolfram carbide powder of true density of 15630 kg/m3 was used in a cold-model counter-current three-stage fluidized bed with downcomers. Stability of operation, operating range and hydrodynamics were systematically studied. The fluidization quality and operating stability were also compared with a single-stage conical fluidized bed of similar diameter and same solids inventories. The experimental results demonstrated that this high-density wolfram carbide powder could be fluidized and circulated continuously at this multistage fluidized bed, but lower fluidization quality was observed and the stable operating range is narrow. Narrower stable operating range was observed at higher solids circulation rates. At corresponding operating conditions, the fluidization quality of multistage fluidized bed is significantly better than that of the conical fluidized bed with a similar solids inventory. ? 2024 Elsevier B.V.

ISSN号：1385-8947

卷、期、页：v 500,

发表日期：2024-11-15

期刊分区（SCI为中科院分区）：一区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：Chemical Engineering Journal

参与作者：周少强,吴秀花

通讯作者：张一鸣,杨颖,王欢,许晨欢

第一作者：李舒月,张永民

论文类型：期刊论文

论文概要：张一鸣,杨颖,王欢,许晨欢,周少强,李舒月,张永民,吴秀花，Hydrodynamics and operation of a multistage fluidized bed with particles of super-high density，Chemical Engineering Journal，2024，v 500,

论文题目：Hydrodynamics and operation of a multistage fluidized bed with particles of super-high density