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Effect of Operating Parameters on Carbon Dioxide Depressurized Regeneration in Circulating Fluidized Bed Downer using Computational Fluid Dynamics

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Journal of Thermal Science 2021年第3期30卷 1057-1067页

作者： SAKAUNNAPAPORN Chattan CHAIWANG Pilaiwan PIUMSOMBOON Pornpote CHALERMSINSUWAN Benjapon Department of Chemical Technology Faculty of ScienceChulalongkorn University254 Phyathai RoadWangmaiPathumwanBangkok 10330Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University254 Phyathai RoadWangmaiPathumwanBangkok 10330Thailand Advanced Computational Fluid Dynamics Research Unit Chulalongkorn University254 Phyathai RoadWangmaiPathumwanBangkok 10330Thailand

Typically,heating or high-temperature treatment has been used to regenerate solid *** this study,the depressurized regeneration using a circulating fluidized bed downer was proposed and the significance of its operating parameters was ***-dimensional computational fluid dynamics were employed to systematically investigate the effects of operating parameters on carbon dioxide depressurized regeneration with potassium carbonate solid sorbent *** simulated model was based on a laboratory scale circulating fluidized bed *** chemical equilibrium model for predicting the highest outlet carbon dioxide mass fraction was then used.A central composite design was employed to identify the main,quadratic,and interaction effects of operating parameters to the regeneration *** operating parameters consisted of the outlet system pressure,inlet gas velocity,and inlet solid circulation rate,while the response variable was the released outlet carbon dioxide mass *** the multiple operating parameters,there were two main operating parameters and their combinations,namely the inlet gas velocity,outlet system pressure,square of inlet gas velocity,and interaction between inlet gas velocity and outlet system pressure,which had great impacts on the *** the main,quadratic,and interaction effects were ***,the optimal operating conditions were obtained through the response surface method.

关键词： carbon dioxide circulating fluidized bed downer computational fluid dynamics depressurized regeneration statistical experimental design

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Effect of a pulsating flow on hydrodynamics and fluid catalytic cracking chemical reaction in a circulating fluidized bed riser

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Particuology 2022年第8期20卷 47-56页

作者： Pilaiwan Chaiwang Hannarong Chitcharoenyoo Pornpote Piumsomboon Benjapon Chalermsinsuwan Fuels Rsearch Centerpartment of Chemical Tchnology Faculty of Science Chulalongkon University 254 Phyathai RadWangmaiPathumwan Bangkok 10330Thailand Program in Petrochemistry and Polymer Science Faculty of ScienceChulalongkorn University.254 Phyathai Road WangmaiPathumwanBangok 10330Thailand Centero Eellenceon Perochemicaland Materials Techology Chulalongorn Universy 254 Phyathai Road WangmaiathumwanBangkok 10330.Thailand Advanced Computational Fuidynamics Research Unit Chulalongkom Universy254 Phyathai RoadWangmai Pathumwan Bangkok 10330Thailand

The three-dimensional computational fuid dynamics(3D-CFD)of a pulsating flow applied to the fluid catalytic cracking(FCC)reaction was investigated in the riser of a circulating fluidized bed *** kinetic parameters of the FCC and coke burning reactions for predicting the reactant conversion and product yield percentages were *** increase the reactant conversion level and product *** effect of the pulsating flow operating parameters was considered using a 2k statistical experimental design with four factors(amplitude,frequency,types of the waveform,and amplitude ratio).The 3DCFD simulation was successfully validated from the experimental literature *** frequency and type of the waveform were found to be the significant operating *** expression of the fitted regression model and response surface contour were derived and revealed that the pulsating flow provides a higher reactant conversion level and product yield percentages compared to a non-pulsating or steady flow.

关键词： Fluidcatalytic cracking Circulating fluidized bed riser Computationalfluid dynamics Pulsating statistical experimental design

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Simultaneous saccharification and fermentation of wheat bran flour into ethanol using coculture of amylotic Aspergillus niger and thermotolerant Kluyveromyces marxianus

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Frontiers of Chemical Science and Engineering 2009年第3期3卷 240-249页

作者： K.MANIKANDAN T.VIRUTHAGIRI Bioprocess Laboratory Department of Chemical EngineeringAnnamalai UniversityAnnamalai Nagar 608002India

Studies on simultaneous saccharification and fermentation(SSF)of wheat bran flour,a grain milling residue as the substrate using coculture method were carried out with strains of starch digesting Aspergillus niger and nonstarch digesting and sugar fermenting Kluyveromyces marxianus in batch ***-ments based on central composite design(CCD)were conducted to maximize the glucose yield and to study the effects of substrate concentration,pH,temperature,and enzyme concentration on percentage conversion of wheat bran flour starch to glucose by treatment with fungalα-amylase and the above parameters were optimized using response surface methodology(RSM).The optimum values of substrate concentration,pH,temperature,and enzyme concentration were found to be 200g/L,5.5,65℃ and 7.5IU,respectively,in the starch saccharification *** effects of pH,temperature and substrate concentration on ethanol concentration,biomass and reducing sugar concentration were also *** optimum temperature and pH were found to be 30℃ and 5.5,*** wheat bran flour solution equivalent to 6%(w/V)initial starch concentration gave the highest ethanol concentrationof 23.1g/Lafter 48hoffermentation at optimum conditions of pH and *** growth kinetics was modeled using Monod model and Logistic model and product formation kinetics using Leudeking-Piret *** saccharificiation and fermenta-tion of liquefied wheat bran starch to bioethanol was studied using coculture of amylolytic fungus *** and nonamylolytic sugar fermenting ***.

关键词： simultaneous saccharification and fermenta-tion(SSF) starch coculture fermentation statistical experimental design bioethanol Monod model

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