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Experimental study on reactor performance of gas-solids low-velocity fluidized beds

Particuology 2022年第7期20卷 21-28页

作者： Jiangshan Liu Jesse Zhu Particle Technology Research Centre Department of Chemical and Biochemical EngineeringThe University of Western OntarioLondonOntarioN6A 3K7Canada

reactor performance of bubbling fluidized bed(BFB)and turbulent fluidized bed(TFB)was carefully examined and systematically compared using catalytic ozone decomposition as a model reaction,based on a complete mapping of local flow structures and spatial distributions of ozone conversion and solids *** clearly has a higher conversion and shows better reactor performance than BFB as a result of the vigorously turbulent flow and the relatively homogeneous gas–solids mixing in ***,the intensive interaction between gas and solids in TFB leads to greater gas–solids contact efficiency of TFB over that of *** to gas bypassing and backmixing caused by bubbling behaviours and two-phase structure,BFB deviates significantly from a plug flow reactor and sometimes from a continuously stirred tank *** flow structures essentially dictate the reactor performance in the low-velocity fluidized beds.

关键词： Bubbling fluidized bed Turbulent fluidized bed Conversion distribution Flow structure reactor performance Gas–solids contact efficiency

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Reaction performance of fluidized bed catalytic reactor of Group C^(+)particles

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Particuology 2021年第1期19卷 5-16页

作者： Zhiwei Zhao Yandaizi Zhou Xiaojun Bao Jesse Zhu Haiyan Liu State Key Laboratory of Heavy Oil Processing Department of Chemical EngineeringChina University of PetroleumBeijing 102249China Particle Technology Research Center Department of Chemical and Biochemical EngineeringThe University of Western OntarioLondonOntario N6A 5B9Canada

Group C particles are often regarded as non-fluidizable but have proven to effectively fluidize with nanoparticle addition,which results in small bubbles and a high gas holdup in the dense phase during the *** C^(+)particles provide an increased surface area for gas-solid contact and improve the reaction performance,especially for gas-phase catalytic *** the basis of a previous study of the ozone decomposition reaction using Group C^(+)particles,a two-phase model was used to evaluate the reactor contact efficiency,and was used to compare the partial oxidation performance of the n-butane to maleic anhydride reaction in fluidized-bed catalytic reactors of Group C^(+)and Group A *** reactor with Group C^(+)particles achieved a higher n-butane conversion and MAN yield compared with that using Group A particles,based on the identical catalyst quantity or on the same gas residence ***,the reactor with Group C^(+)particles can achieve the same reaction conversion and yield with fewer catalysts or a smaller reactor size,or ***,the fluidized bed catalytic reactor of Group C^(+)particles is expected to be of major significance in industrial processes,especially for gas-phase catalytic reactions.

关键词： Group C^(+)particles Fluidized bed catalytic reactor reactor performance Nanoparticles Modified two-phase model Effective surface area

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Evaluation of activated sludge properties’changes in industrial-wastewater pre-treatment:role of residual aluminum hydrolyzed species with different polymerization degree

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 141-151页

作者： Ziqi Zhao Meng Li Wansong Huang Nuowei Guo Qian Zhang School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Hubei Jianke International Construction Ltd.Co Wuhan 430070China Wuhan Hanyang Municipal Construction Group Co.Ltd. Wuhan 430000China Shenzhen Research Institute of Wuhan University of Technology Shenzhen 518000China

With the widespread introduction of pre-coagulation prior to the biological unit in various industrial wastewater treatments,it is noteworthy that long-term accumulation of residual coagulants has certains effect on both micro and macro characteristics of activated sludge(AS).In this study,the morphology distributions of residual aluminum salts(RAS)and their effects on the removal efficiency of AS were investigated under different PAC *** results showed that the dominance of medium polymeric RAS,formed under an appropriate PAC dose of 20 mg/L enhanced the hydrophobicity,flocculation,and sedimentation performances of AS,as well as the enzymatic activity in cells in the sludge system,improving the main pollutants removal efficiency of the treatment *** the species composition with monomer and dimer/high polymer RAS as the overwhelming parts under an over-dosed PAC concentration of 55 mg/L resulted in excessive secretion of EPS with loose flocs structure and conspicuous inhibition of cellular activity,leading to the deterioration of physico-chemical and biological properties of *** on these findings,this study can shed light on the role of the RAS hydrolyzed species distributions,closely relevant to Al dosage,in affecting the comprehensive properties of AS and provide a theoretical reference for coagulants dosage precise control in the pretreatment of industrial wastewater.

关键词： Coagulation/flocculation Hydroxyl-aluminum Hydrolysis reaction reactor performance Activated sludge property Surface properties

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煤直接液化反应动力学模型化和模拟研究

煤直接液化反应动力学模型化和模拟研究

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作者：杨中凯北京化工大学

学位级别：硕士

Coal is the most abundant fossil fuel known in China,and also a vital global energy ***,the main consumption of coal is pulverized coal combustion for power generation which leads to environmental pollution and *** coal liquefaction is an advantageous approach for the clean and effective utilization of coal,and also an effective way to solve the energy shortage problem in our *** the successful process design and its engineering of coal liquefaction,it is inevitable to implement the liquefaction modeling study,i.e.,exploring the reaction schemes involved,deriving the kinetics rate expressions and identifying the major influencial process parameters,so as to quantitatively describe the complicated reaction process taking place.This research was performed with a partial support of the National Basic Research Program(973 Program)of China,aiming at the modeling and simulations of the kinetics of Shenhua coal direct liquefaction carried out in batch *** objectives of the present work are 1)to develop the liquefaction kinetics model for Shenhua coal by incorporating thermodynamic calculations,and 2)to build reactor models of direct coal liquefaction by using artificial neural networks(ANN)and support vector machine(SVM)for simulating the performances of batch reactors, respectively.First,a batch reactor model for Shenhua coal liquefaction was developed,taking the co-existing vapor and liquid phases into account. Based on the kinetics data reported in literature,we derived quantitatively the reaction kinetics of Shenhua coal *** is demonstrated that it is necessary in the interpretation of the kinetics data to calculate the concentrations of each component present in the liquid phase by thermodynamic *** coal was divided into three parts,i.e., easy reactive part,hard reactive part and unreactive *** easy reactive part generates directly the oil plus gas(O+G);the hard reactive part generates the pre

关键词： Coal liquefaction Kinetic modeling reactor performance Artificial Neural Networks Support vector machine Sensitivity analysis

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