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Temperature influence on minimum fluidization velocity:Complexity,mechanism,and solutions

Particuology 2024年第5期88卷 344-349页

作者： Qingjin Zhang Liangliang Fu Guangwen Xu Dingrong Bai Key Laboratory on Resources Chemicals and Material of Ministry of Education Shenyang University of Chemical TechnologyShenyang 110142China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110142China School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051China

Fluidized-bed reactors are widely employed in various high-temperature industrial processes.Thus,it is crucial to understand the temperature effect on various fluidization phenomena,specifically the minimum fluidization velocity(U mf)that governs various aspects of fluidized bed behavior.In this study,we comprehensively analyze U mf data from the literature to unravel the complexity and underlying mechanisms of temperature influence on this critical velocity.The research examines experimental data encompassing a wide range of temperatures,pressures,and solid particles.The analysis reveals that the influence of temperature on U mf is fundamentally determined by the relative importance of hydrodynamic forces and interparticle forces within fluidized beds and is realized by three distinctive temperature-induced changes:gas properties,bed voidage,and physiochemical characteristics of particles.On this basis,an equation is derived to enable predictions of temperature influences on the minimum fluidization velocity under broad temperature conditions.

关键词： High-temperature gas-solids fluidized beds Minimum fluidization velocity Hydrodynamic forces Interparticle forces bed voidage

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Hydrodynamic characteristics of a rectangular gas-driven inverse liquid-solid fluidized bed

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Particuology 2023年第7期78卷 86-96页

作者： Yicheng Deng Keying Ma jaqi Huang Yuanyuan Shao Jesse Zhu School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China Department of Chemical and Biochemical Engineering Western UniversityLondonOntarioN6A3K7Canada Institute of Shaoxing Tianjin UniversityZhejiang312300China Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute The University of Nottingham Ningbo ChinaNingboZhejiang.315100China

The hydrodynamic characteristics of a rectangular gas-driven inverse liquid-solid fluidized bed(GDFB)using particles of different diameters and densities were investigated in detail.Rising gas bubbles cause a liquid upflow in the riser portion,enabling a liquid downflow that causes an inverse fluidization in the downer portion.Four flow regimes(fixed bed regime,initial fluidization regime,complete fluidization regime,and circulating fluidization regime)and three transition gas velocities(initial fluidization gas velocity,minimum fluidization gas velocity,and circulating fluidization gas velocity)were identified via visual observation and by monitoring the variations in the pressure drop.The axial local bed voidage(e)of the downer first decreases and then increases with the increase of the gas velocity.Both the liquid circulation velocity and the average particle velocity inside the downer increase with the increase of the gas velocity in the riser,but decrease with the particle loading.An empirical formula was proposed to successfully predict the Richardson-Zaki index“n”,and the predicted e obtained from this formula has a±5%relative error when compared with the experimental e.

关键词： Gas-driven Inverse fluidized bed Flow regime Average particle velocity Liquid circulation velocity bed voidage

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