Systematic analysis of mixing and segregation patterns of binary mixtures in fluidised beds for multi-functional processes

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-02 DOI:10.1016/j.powtec.2024.120419

Hualun Zhu, Paola Lettieri, Massimiliano Materazzi

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Abstract

Fluidized beds are increasingly used in renewable energy and chemical production due to their versatility in handling different solids for multi-functional industrial applications. The diversity in size and density of solid particles impacts fluidization, influencing mixing and segregation behaviours critical for optimizing chemical processes and reactor design. This study investigates the expansion and segregation behaviours of mixed Geldart group powders in binary systems, simulating polydispersed beds with different materials and catalysts. By applying a modified Cheung equation and an adapted Gibilaro-Rowe model, the study analyzes segregation behaviours of Geldart Group A and B materials at varying mixing rates and gas flow velocities. Results show a good match between experimental data and model predictions. Using novel non-invasive X-ray imaging, the study provides real-time analysis of mixing and segregation at different fluidization regimes and temperatures. These findings aid in designing and optimizing advanced thermochemical conversion technologies, enhancing process efficiency and resilience.

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对流化床中二元混合物的混合和分离模式进行系统分析，以实现多功能工艺

流化床因其处理不同固体的多功能性，越来越多地应用于可再生能源和化工生产领域。固体颗粒尺寸和密度的多样性会影响流化，影响对优化化学过程和反应器设计至关重要的混合和偏析行为。本研究通过模拟含有不同材料和催化剂的多分散床，研究了二元体系中混合 Geldart 组粉末的膨胀和偏析行为。通过应用修改后的 Cheung 方程和改编后的 Gibilaro-Rowe 模型，该研究分析了不同混合速率和气体流速下 Geldart A 组和 B 组材料的偏析行为。结果表明，实验数据与模型预测结果十分吻合。该研究利用新型非侵入式 X 射线成像技术，对不同流化状态和温度下的混合和偏析情况进行了实时分析。这些发现有助于设计和优化先进的热化学转化技术，提高工艺效率和复原能力。

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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.