Comparison of hydrodynamics and operational characteristics of a multistage fluidized bed with high-density and low-density powders

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-07-08 DOI:10.1016/j.powtec.2025.121380

Yiming Zhang , Fan Xu , Huan Wang , Yongmin Zhang , Shuyue Li , Xiuhua Wu

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引用次数: 0

Abstract

Multistage fluidized bed reactors have advantages for higher gas-solids contact efficiency in uranium recycling processes, where uranium compound powders used have high densities, usually several times greater than those in chemical industry. However, little literature has compared hydrodynamics and operation of multistage fluidized beds used particles with significantly different densities. In this study, we compared similarities and differences in hydrodynamics and operational characteristics for wolfram carbide (15,630 kg/m³) and FCC (2200 kg/m³) powders with similar size in a three-stage fluidized bed. During the start-up period, severe difficulties were experienced in achieving stable operation with FCC particles. During stable operating range, the experimental results indicated that stable fluidization and circulation were achievable with two types of particles in the multistage fluidized bed, but large pressure drop fluctuation (FCC: 10–30 Pa; WC: 100–800 Pa) and wider stable operating range (FCC: 0.01–0.29 m/s; WC: 0.04–0.69 m/s) were observed using high-density particles. Higher-pressure drop distributors optimize high-density particles operation in multistage fluidized beds, improving fluidization quality while maintaining operating velocities within stable operating ranges.

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高密度和低密度粉末多级流化床的流体力学和运行特性比较

多级流化床反应器在铀再循环过程中具有气固接触效率高的优点，在铀再循环过程中使用的铀化合物粉末密度很高，通常是化学工业中铀化合物粉末的数倍。然而，很少有文献比较了不同密度颗粒的多级流化床的流体力学和运行情况。在这项研究中，我们比较了碳化钨（15630 kg/m3）和FCC （2200 kg/m3）粉末在三级流化床中具有相似粒度的流体力学和操作特性的异同。在启动阶段，催化裂化颗粒的稳定运行遇到了很大的困难。在稳定运行范围内，两种颗粒在多级流化床内均可实现稳定流化和循环，但压降波动较大(FCC: 10 ~ 30 Pa；WC: 100-800 Pa)和更宽的稳定工作范围(FCC: 0.01-0.29 m/s；WC: 0.04 ~ 0.69 m/s)。高压降分布器优化了多级流化床中高密度颗粒的操作，提高了流化质量，同时将操作速度保持在稳定的操作范围内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.