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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 reactor.The kinetic parameters of the FCC and coke burning reactions for predicting the reactant conversion and product yield percentages were applied.To increase the reactant conversion level and product yield.the 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 data.The frequency and type of the waveform were found to be the significant operating parameters.The 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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Carbon dioxide desorption behavior of potassium carbonate supported on gamma-alumina solid sorbent in wet fluidized bed under steam atmosphere

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Particuology 2023年第10期81卷 15-24页

作者： Sasitron Angkanawisan Dimitri Gidaspow Pornpote Piumsomboon benjapon chalermsinsuwan Fuels Research Center Department of Chemical TechnologyFaculty of ScienceChulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand Department of Chemical and Biological Engineering Armour College of EngineeringIllinois Institute of Technology10 West 35th StreetChicagoIL60616United States Advanced Computational Fluid Dynamics Research Unit Chulalongkorn University254 Phayathai RoadPathumwanBangkok10330Thailand

Since the carbon dioxide(CO_(2))capture using solid sorbent is a reversible reaction,the solid sorbent can be regenerated by the desorption process.Therefore,the desorption process is one of the key important processes for the CO_(2)capture system.Traditionally,most of the literature studies focus on the desorption of solid sorbent under an N_(2)atmosphere.However,the desorption process of the solid sorbent is inappropriate in the real system because the system will need another process to separate CO_(2)and nitrogen(N_(2))after the desorption process.This study focused on the CO_(2)desorption of potassium carbonate supported on gamma-alumina(K2CO3/γ-Al_(2)O_(3))in a wet fluidized bed under a steam atmosphere by using the multiphase computational fluid dynamics(CFD)simulation.The effects of water thickness and dry restitution coefficient on CO_(2)desorption rate were investigated to provide a realistic particle collision behavior and to explore their effects on CO_(2)desorption phenomena.Moreover,the effect of steam velocity on the hydrodynamic behaviors of fluidization which on CO_(2)desorption rate was studied.The simulated results demonstrated that all the parameters,water thickness,dry restitution coefficient,and steam velocity had significantly affected system hydrodynamics and CO_(2)desorption rate in the wet fluidization desorption process.Furthermore,the effect of desorption temperature on CO_(2)desorption rate was evaluated for finding the appropriate temperature for CO_(2)desorption process of K2CO3/γ-Al_(2)O_(3).The results showed that the appropriate desorption temperature for CO_(2)desorption under steam atmosphere was the temperature over 150℃.

关键词： CO_(2)desorption Fluidized bed K_(2)CO_(3)/Y-Al_(2)O_(3) Restitution coefficient Wet fluidization Computational fluid dynamics

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Measuring turbulence in a circulating fluidized bed using PIV techniques

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Particuology 2011年第6期9卷 572-588页

作者： Mayank Kashyap benjapon chalermsinsuwan Dimitri Gidaspow Department of Chemical and Biological Engineering Illinois Institute of Technology Fuel Research Center Department of Chemical Technology Faculty of Science Chulalongkorn University Center of Excellence for Petroleum Petrochemicals and Advanced Materials Chulalongkorn University

This study utilized the particle image velocimetry （P1V） technique, non-invasively near the wall, in the developing region, for the measurements of laminar and turbulent properties during circulation of Geldart B type particles in the U.S. Department of Energy （DOE） National Energy Technology Laboratory （NETL） riser. A novel method was used to measure axial and radial laminar and turbulent solids dispersion coefficients using autocorrelation technique. The instantaneous and hydrodynamic velocities for the solid phase were measured simultaneously in the axial and radial directions using a CCD camera, with the help of a colored rotating transparency. The measured properties, such as laminar and Reynolds stresses, laminar and turbulent granular tempera- tures, laminar and turbulent dispersion coefficients and energy spectra exhibited anisotropy. The mixing in the riser was on the level of clusters. The total granular temperatures were in reasonable agreement with the literature values. However, the axial and radial solids dispersion coefficients measured near the wall were slightly lower than the radially averaged values in the literature.

关键词： Particle image velocimetry （PIV） Dispersion coefficient Autocorrelation Turbulence Anisotrnpy

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Simulations of sorbent regeneration in a circulating fluidized bed system for sorption enhanced steam reforming with dolomite

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Particuology 2020年第3期18卷 156-172页

作者： Kiattikhoon Phuakpunk benjapon chalermsinsuwan Sompong Putivisutisak Suttichai Assabumrungrat Center of Excellence in Catalysis and Catalytic Reaction Engineering Department of Chemical EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok10330Thailand Energy Research Institute Chulalongkorn UniversityBangkok10330Thailand Fuels Research Center Department of Chemical TechnologyFaculty of ScienceChulalongkorn UniversityBangkok10330Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn UniversityBangkok10330Thailand Advanced Computational Fluid Dynamics Research Unit Chulalongkorn UniversityBangkok10330Thailand Department of Mechanical Engineering Faculty of EngineeringChulalongkorn UniversityBangkok10330Thailand

In this work,the sorption enhanced steam reforming (SESR) method was developed for improved hydrogen (H2) production,and the drawbacks of conventional steam reforming processes on H2 yield and purity were overcome.However,the SESR process is discontinuous and requires regeneration after sorbent saturation with CO2.The circulating fluidized bed reactor (CFBR) system has previously been proposed for continuous H2 production,with both reforming and sorbent regeneration occurring simultaneously.The main aim of this work was to determine the feasibility and performance of SESR with a proper design and conditions in conjunction with the CFBR system.The reforming riser and bubbling bed regenerator are studied separately but related to each other.Two-dimensional transient models using the Euler-Euler approach and kinetic theory of granular flow were used for fluid dynamic simulations combined with the decarbonation kinetics of dolomite,to investigate a conceptual regenerator system and determine its key conditions.A mixture of the Ni-based catalyst and dolomite from the risers was injected with a flux of 200 kg/(m2 s) and a catalyst to sorbent ratio of 2.54 kg/kg.A double-stage bubbling bed regenerator system was designed with 1.2 m width,0.8 m bed height,a gas inlet velocity of 0.2 m/s and solid preheating at 950 ℃.The used dolomite was regenerated with an assumed CaO conversion of 3%;the almost fresh dolomite was then released with good mixing of the catalyst and sorbent.

关键词： CaO sorbent Regenerator Computational fluid dynamics Circulating fluidized bed Multiphase flow model

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Prediction of pyrolysis kinetic parameters from biomass constituents based on simplex-lattice mixture design

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Chinese Journal of Chemical Engineering 2016年第4期24卷 535-542页

作者： Panusit Sungsuk Sasiporn Chayaporn Sasithorn Sunphorka Prapan Kuchonthara Pornpote Piumsomboon benjapon chalermsinsuwan Fuels Research Center Department of Chemical TechnologyFaculty of ScienceChulalongkorn University254 Phayathai RoadPatumwanBangkok 10330Thailand Faculty of Engineering and Architecture Rajamangala University of Technology Tawan-okUthenthawai Campus225 Phayathai RoodBangkok 10330Thailand Center of Excellence on Petrochemical and Material Technology Chulalongkorn University254 Phayathoi RoadPatumwanBangkok 10330Thailand

The aim of this study is to determine the effect of the main chemical components of biomass: cellulose, hemicellulose and lignin, on chemical kinetics of biomass pyrolysis. The experiments were designed based on a simplexlattice mixture design. The pyrolysis was observed by using a thermogravimetric analyzer. The curves obtained from the employed analytical method fit the experimental data(R2N 0.9). This indicated that this method has the potential to determine the kinetic parameters such as the activation energy(Ea), frequency factor(A) and reaction order(n) for each point of the experimental design. The results obtained from the simplex-lattice mixture design indicated that cellulose had a significant effect on Eaand A, and the interaction between cellulose and lignin had an important effect on the reaction order, n. The proposed models were then proved to be useful for predicting pyrolysis behavior in real biomass and so could be used as a simple approximation for predicting the overall trend of chemical reaction kinetics.

关键词：热解动力学生物质组分混合设计参数预测单纯形格子化学反应动力学实验设计

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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 sorbent.In this study,the depressurized regeneration using a circulating fluidized bed downer was proposed and the significance of its operating parameters was identified.Two-dimensional computational fluid dynamics were employed to systematically investigate the effects of operating parameters on carbon dioxide depressurized regeneration with potassium carbonate solid sorbent particles.The simulated model was based on a laboratory scale circulating fluidized bed downer.The 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 process.The 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 fraction.Among 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 regeneration.All the main,quadratic,and interaction effects were explained.Then,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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