{"title":"Study on flow characteristics in liquid-solid circulating fluidized beds with evenly distributed pulsating liquid flows","authors":"Yangfan Song, Ruipeng Shi, Liuping He, Yunyi Li, Xiang Wei, Hongwei Chen, Zhuo Liu","doi":"10.1016/j.powtec.2025.120951","DOIUrl":null,"url":null,"abstract":"<div><div>Liquid-solid circulating fluidized beds, known for their significant liquid-solid velocity differences and efficient interphase mixing, are widely utilized in the fields of chemical engineering and environmental biology, significantly advancing industrial processes. To further enhance the reactor's heat and mass transfer efficiency, this work designs a liquid-solid circulating fluidized bed reactor featuring an evenly distributed pulsating liquid flow, building upon the introduction of pulsating liquid flow. This work employs a combination of numerical simulation and experimental methods to investigate the effects of various pulsating liquid flow parameters, such as period and amplitude, as well as the steady liquid flow velocity on the reactor's flow characteristics. The results indicate that the configuration condition of the flow significantly impacts the flow characteristics, whereas the effect of the pulsation period on the flow characteristics is less pronounced compared to the amplitude of the liquid flow. Across various conditions, the introduction of evenly distributed pulsating liquid flow enhances the interphase relative velocity and the average solids holdup in the bed, thereby improving the reactor's efficiency. Among various configurations, the six-split liquid flow configuration demonstrates the most balanced flow characteristics, exhibiting relatively uniform radial particle distribution, high bed space utilization efficiency, and effective exploitation of turbulent kinetic energy from pulsating liquid flows.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120951"},"PeriodicalIF":4.6000,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591025003468","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Liquid-solid circulating fluidized beds, known for their significant liquid-solid velocity differences and efficient interphase mixing, are widely utilized in the fields of chemical engineering and environmental biology, significantly advancing industrial processes. To further enhance the reactor's heat and mass transfer efficiency, this work designs a liquid-solid circulating fluidized bed reactor featuring an evenly distributed pulsating liquid flow, building upon the introduction of pulsating liquid flow. This work employs a combination of numerical simulation and experimental methods to investigate the effects of various pulsating liquid flow parameters, such as period and amplitude, as well as the steady liquid flow velocity on the reactor's flow characteristics. The results indicate that the configuration condition of the flow significantly impacts the flow characteristics, whereas the effect of the pulsation period on the flow characteristics is less pronounced compared to the amplitude of the liquid flow. Across various conditions, the introduction of evenly distributed pulsating liquid flow enhances the interphase relative velocity and the average solids holdup in the bed, thereby improving the reactor's efficiency. Among various configurations, the six-split liquid flow configuration demonstrates the most balanced flow characteristics, exhibiting relatively uniform radial particle distribution, high bed space utilization efficiency, and effective exploitation of turbulent kinetic energy from pulsating liquid flows.
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.
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