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

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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 ***,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 *** this study,we comprehensively analyze U_(mf) data from the literature to unravel the complexity and underlying mechanisms of temperature influence on this critical *** research examines experimental data encompassing a wide range of temperatures,pressures,and solid *** 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 *** 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

The transition to turbulent fluidization in a gas-solid fluidized bed operating from ambient temperature to 1600℃

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Particuology 2024年第10期93卷 111-124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 TechnologyShenyang110142China School of Materials Science and Engineering Shenyang University of TechnologyShenyang110142China Ordos Laboratory Ordos017010China

Turbulent fluidized bed proves effective in industrial processes due to superior heat and mass transfer and chemical reaction performance. However, understanding the transition to turbulent fluidization remains limited, especially at temperatures exceeding 1000 ℃, making it challenging to develop high-temperature fluidized bed applications. This paper presents an experimental investigation on the turbulent fluidization onset velocity (U_(c)), measured in a 30 mm diameter bed using corundum particles with average diameters from 0.68 mm to 1.58 mm in temperatures from ambient to 1600 ℃. Experimental results reveal that U_(c) increases with temperature up to 600 ℃, stabilizes within the 600–1200 ℃ range, and then decreases above 1200 ℃, demonstrating the varying relative significance of hydrodynamic and interparticle forces at different temperatures. To help design and operate high-temperature applications of turbulent fluidization, we developed U_(c) correlations based on experimental data from both literature sources and this study, covering temperatures of up to 1600 ℃ and particles of Groups A to D.

关键词： High-temperature fluidized beds Turbulent fluidization Transition velocity Pressure fluctuations Hydrodynamic forces Interparticle forces

Synthesis, characterization and catalytic methanation performance of modified kaolin-supported Ni-based catalysts

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2953-2959页

作者： Jiao Liu Chuanyue Zheng Junrong Yue guangwen xu State Key Laboratory of Multi-phase Complex System Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China China University of Mining and Technology Xuzhou 221116China Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical TechnologyShenyang 110142China

Kaolin as a raw material for mesoporous support was firstly modified by calcination,acid treatment,and then was used to prepare nickel *** amount of alumina which was activated in kaolin during thermal treatment and then leached out in the acid was *** pattern of the kaolin calcined at 600°C or 900°C exhibited only the diffraction peaks for amorphous silica and quartz while that calcined at 1100°C showed obvious peaks forγ-Al2 ***,the nickel-based catalysts exhibited different physic-chemical *** syngas methanation over the catalysts clarified an activity order of CA-1100 N CA-900 N CA-1400 N CA-600 N KA≈0 at temperatures of 350–650°C and a space velocity of 120 L·g-1·*** nickel with small diameter which has medium interaction with the modified kaolin and is well dispersed on the support would have reasonably good activity and carbon-resistance for syngas methanation.

关键词： Methanation Kaolin Catalyst Catalyst support Leaching

Challenges and opportunities for engineering thermochemistry in carbon-neutralization technologies

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National Science Review 2023年第9期10卷 11-13页

作者： guangwen xu Dingrong Bai Chunming xu Mingyuan He Key Laboratory on Resources Chemicals and Materials Shenyang University of Chemical Technology College of Chemical Engineering and Environment China University of Petroleum-Beijing Shanghai Key Laboratory of Green Chemistry & Chemical Processes Department of Chemistry East China Normal University

Stalling and neutralizing carbon emissions while maintaining the quality of life is a global challenge of our ***>80% of the world’s energy and materials (***,cement,plastics)from fossil and carbonaceous resources,achieving this goal in a short time needs scientifically sound,economically sustainable and practically effective and deployable approaches,even though many strategies have been proposed by researchers and policymakers [1,2].

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Efficient synthesis of forsterite via high-temperature thermochemical reactions from boron mud waste without briquetting

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Particuology 2024年第4期87卷 124-132页

作者： Fangling Hu Liangliang Fu Qingjin Zhang guangwen xu Dingrong Bai Key Laboratory on Resources Chermticals and Material of Ministry of Education Sheryang Unfversity of Chemical Technology.Shenyang110142China School of Chemical Engineering University of Science and Technology Liaoning.Anshan 114051China School of Materials Science and Engineering Shenyang University of Technology.Shenyang110142China

Forsterite is a highly demanded material in high-temperature industries due to its superior performance in elevated *** study proposes synthesizing high-quality forsterite via high-temperature thermochemical reactions using abundant boron mud *** new synthesis method capitalizes on the high reactivity of fine raw powder materials,enabling the reaction to reach completion at low temperatures *** chemical characteristics,microscopic morphology,and structure of synthe-sized samples are systematically studied using XRD and *** results confirm that boron mud can be efficiently transformed into forsterite after 10 min of reactions at 1500℃.The synthesized products attain over 98.7%densification and contain more than 85.0%forsterite with well-developed *** activation energy of forsterite grain growth in the 1100-1500℃temperature range is 165.5 kJ/*** study provides a low-cost method for producing forsterite and an efficient and environmentally friendly solution for treating solid waste.

关键词： Fluidized bed Boron mud Forsterite Solid state reaction Activation energy Grain growth

Efficient gasification of wet biomass residue to produce middle caloric gas

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Particuology 2008年第5期6卷 376-382页

作者： guangwen xu Takahiro Murakami Toshiyuki Suda Hidehisa Tani Yutaka Mito Research Laboratory IHI Co. Ltd. (IHI) Isogo-Ku Yokohama 235-8501 Japan State Key Laboratory of Multiphase Phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Energy Research Division Kobe steel Co. Ltd. Kobe Hyogo 651-2271 Japan

Various process residues represent a kind of biomass resource already concentrated but containing water as much as 60 wt.%. These materials are generally treated as waste or simply combusted directly to generate heat. Recently, we attempted to convert them into middle caloric gas to substitute for natural gas, as a chemical or a high-rank gaseous fuel for advanced combustion utilities. Such conversion is implemented through dual fluidized bed gasification （DFBG）. Concerning the high water content of the fuels, DFBG was suggested to accomplish either with high-efficiency fuel drying in advance or direct decoupling of fuel drying/pyrolysis from char gasification and tar/hydrocarbon reforming. Along with fuel drying, calcium-based catalyst can be impregnated into the fuel, without much additional cost, to increase the fuel＇s gasification reactivity and to reduce tar formation. This article reports the Ca impregnation method and its resulting effects on gasification reactivity and tar suppression ability. Meanwhile, the principle of directly gasifying wet fuel with decoupled dual fluidized bed gasification （D-DFBG） is also highlighted.

关键词： High-water content biomass Catalytic gasification Dual fluidized bed gasification Decoupled gasification Calcium

Porous carbon from vinegar lees for phenol adsorption

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Particuology 2012年第1期10卷 35-41页

作者： Mei Zhong Yin Wang Jian Yu Yajun Tian guangwen xu State Key Laboratory of Multi-Phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Chemistry and Chemical Engineering Department Xinjiang University Xinjiang 830046 China

An effective technology for utilizing vinegar lees （VL）, a biomass waste generated during its production, is much needed in China due to the huge consumption of vinegar. This study investigates the preparation of porous carbon （PC） from VL, now reporting on the adsorption capability of PC in removing phenol from its aqueous solution. The preparation of PC consists of carbonization of VL in N2 and activation in CO2. The results show that the optimal activation temperature and time in CO2 for VL char carbonized at 800 ℃ were 875 ℃ and 1 h, respectively. The PC prepared was found to have large specific surface area and micropore volume, with an adsorptive capacity for phenol from its aqueous solution much higher than that of commercial coconut shell activated carbon （CSAC）. Adsorption of phenol from its aqueous solution by the VL-based PC was found to follow the isothermal Langmuir equation.

关键词： Porous carbonCarbonizationVinegar leesPhenolWaste water

Synthesis of texture-excellent mesoporous alumina using PEG1000 as structure-directing agent

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Chinese Journal of Chemical Engineering 2017年第1期25卷 137-141页

作者： Kui Zhang Changming Li Jian Yu Shiqiu Gao guangwen xu State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

By varying concentration of PEG1000 as a structure-directing agent,mesoporous alumina with excellent textural properties was *** prepared mesoporous alumina displays high thermal stability,as shown by its textural properties at different calcination temperatures of 600-850 °*** by SEM and TEM revealed that the added PEG surfactant induced the formation of petal-like *** results clarified that all samples were amorphous and their peaks were around the peaks of γ-alumina.N_2 adsorption-desorption analysis showed that the prepared mesoporous alumina,if with PEG1000 in hydrolysis of aluminum isopropoxide,had excellent textural properties with large specific surface area,high pore volume and suitable pore *** petal-like structure existing in the alumina samples improved their textural parameters,and the role and influential mechanism of PEG1000 were analyzed.

关键词： Alumina PEG1000 Surfactant Stability

Two-fluid modeling of Geldart A particles in gas-solid micro-fluidized beds

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Particuology 2015年第4期13卷 118-127页

作者： Xiaoxing Liu Chuanqiang Zhu Shujun Geng Meiqin Yao Jinhui Zhan guangwen xu State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Science Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The fiuidization behavior of Geldart A particles in a gas-solid micro-fluidized bed was investigated by Eulerian-Eulerian numerical simulation. The commonly used Gidaspow drag model was tested first. The simulation showed that the predicted minimum bubbling velocities were significantly lower than the experimental data even when an extremely fine grid size （of approximately one particle diameter） was used. The modified Gibilaro drag model was therefore tested next. The predicted minimum bubbling velocity and bed voidage were in reasonable agreement with the experimental data available in literature. The experimentally observed regime transition phenomena from bubbling to slugging were also reproduced successfully in the simulations. Parametric studies indicated that the solid-wall boundary conditions had a significant impact on the predicted gas and solid flow behavior.

关键词： Micro-fluidized bed Geldart A particle Two-fluid model Boundary condition Drag model