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Influence of cycle time distribution on coating uniformity of particles in a spray fluidized bed by using CFD-DEM simulations

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Particuology 2023年第5期76卷 151-164页

作者： Heng Li Daoyin Liu jiliang ma Xiaoping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy&EnvironmentSoutheast UniversityNanjing210096China

Cycle Time Distribution(CTD)plays a critical role for determining uniformity of particle coating in spray fluidized ***,the CTD is influenced by both geometrical structure and operating conditions of fluidized *** this study,a spray fluidized bed of coating process is simulated by a comprehensive Computational Fluid Dynamics-Discrete Element Model(CFD-DEM).To achieve different behaviors of CTD,some modifications are designed on a pseudo-2D internally circulating fluidized bed,which traditionally composes of a high-velocity upward bed and low-velocity downward *** modifi-cations include making the air distributor slope and/or laying a baffle in the downward ***,the CTD and evolution of particle size distribution under different bed structures are *** CTD directly influences the coating *** making the particles flowing along a parallel direction in the downward bed through the geometrical modifications,the CTD becomes narrower and the coating uniformity is significantly ***,under the optimized bed structure,the influence of oper-ating conditions on the coating uniformity is *** increasing the fluidization gas velocity and the fluidization gas temperature and reducing the liquid spray rate can improve the coating uniformity.

关键词： Spray fluidized bed Particle coating Cycle time distribution CFD-DEM

Equilibrium charge and triboelectric coefficient of spheres in a rotating container

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Particuology 2022年第4期20卷 103-111页

作者： Jiawei Hu Cai Liang Qun Zhou jiliang ma Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Contact electrification occurs in many granular material systems due to particle-particle and particle-wall *** this paper,we used a simple device to characterize the electrification of different spheres in a rotating spherical *** charge of the spheres was quantified by a Faraday cup after rotating for various time and the disperse behaviors of charged spheres were recorded by a *** effects of the rotational time,sphere size,rotational speed,sphere material,and relative humidity on the equilibrium charge and triboelectric coefficient were *** results show that the equilibrium surface charge density is independent of the sphere size and the rotating speed,whereas the larger rotating speed enhances the triboelectric *** is also shown that charge relaxation constants are two orders of magnitude lower than the charge generation constants for all spheres at a low relative *** increase of water molecules in the air was found to result in the decline of charge generation constant and the rise of charge relaxation constant,which together cause the decrease of the equilibrium surface charge density.

关键词： Particle charging Equilibriurm charge Charge relaxation Charge generation Electrostatics

Influence of multi-factor interactions on particle growth during top-spray fluidized bed agglomeration

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Particuology 2024年第11期94卷 173-186页

作者： Chunyin Wang jiliang ma Jialiang Cai Han Pu Xiaoping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China

Considering the strong dependence of agglomerate characteristics on various operating parameters,this study employs the control variable methodology(CVM)and response surface methodology(RSM)to investigate the influence of multi-factor interactions on particle growth during top-spray fluidized bed ***,CVM is conducted to assess the effects of individual operating parameters on the agglomerate properties,such as mean particle size,relative width,and ***,the interactive relationship between these input variables and the quality attributes of the process is investigated using *** results show that the mean particle size increases with the increase of binder viscosity and spray rate,while it decreases with the increase of fluidization gas velocity and inlet gas *** relative width of the particle size distribution increases with the spray rate,binder viscosity,and fluidization gas velocity,and hardly changes with the inlet gas *** mean particle size is more sensitive to the binder spray rate at a lower level of fluidization gas velocity or a higher level of inlet gas *** fluidization gas velocity corresponding to the maximum D_(50) changes when the binder viscosity and binder spray rate are at different levels.

关键词： Top-spray fluidized bed granulation Agglomeration Response surface methodology Particle size distribution

Clean production of lactic acid by selective carbon-carbon bond cleavage of biomass feedstock over a novel carbon-bismuth oxychloride photocatalyst

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 69-81页

作者： Zulfiqar Ali jiliang ma Dongnv Jin Rui Cui Runcang Sun Liaoning Key Lab of Lignocellulose Chemistry and Biomaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

The use of functional materials such as carbon-bismuth oxyhalides in integrated photorefineries for the clean production of fine chemicals requires restructuring.A facile biomass-assisted solvothermal fabrication of carbon/bismuth oxychloride nanocomposites(C/BiOCl)was achieved at various *** with BiOCl and C/BiOCl-120,C/BiOCl-180 exhibited higher crystallinity,wider visible light absorption,and a faster migration/separation rate of photoinduced *** the selective C–C bond cleavage of biomass-based feedstocks photocatalyzed by C/BiOCl-180,the xylose conversion and lactic acid yield were 100%and 92.5%,respectively.C/BiOCl-180 efficiently converted different biomass-based monosaccharides to lactic acid,and the efficiency of pentoses was higher than that of ***,lactic acid synthesis was favored by all active radicals including superoxide ion(·O_(2)^(−)),holes(h^(+)),hydroxyl radical(·OH),and singlet oxygen(^(1)O_(2)),with·O_(2)^(−)playing a key *** fabricated photocatalyst was stable,economical,and *** use of biomass-derived monosaccharides for the clean production of lactic acid via the C/BiOCl-180 photocatalyst has opened new research horizons for the investigation and application of C–C bond cleavage in biomass-based feedstocks.

关键词： carbon-carbon bond cleavage biomass reforming C/BiOCl lactic acid photocatalysis

Particle residence time distribution and axial dispersion coefficient in a pressurized circulating fluidized bed by using multiphase particle-in-cell simulation

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Chinese Journal of Chemical Engineering 2024年第5期69卷 167-176页

作者： Jinnan Guo Daoyin Liu jiliang ma Cai Liang Xiaoping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096China

The particle residence time distribution(RTD)and axial dispersion coefficient are key parameters for the design and operation of a pressurized circulating fluidized bed(PCFB).In this study,the effects of pressure(0.1-0.6 MPa),fluidizing gas velocity(2-7 m·s^(-1)),and solid circulation rate(10-90 kg·m^(-2)·s^(-1))on particle RTD and axial dispersion coefficient in a PCFB are numerically investigated based on the multiphase particle-in-cell(MP-PIC)*** details of the gas-solid flow behaviors of PCFB are *** on the gas-solid flow pattern,the particles tend to move more orderly under elevated *** an increase in either fluidizing gas velocity or solid circulation rate,the mean residence time of particles decreases while the axial dispersion coefficient *** an increase in pressure,the core-annulus flow is strengthened,which leads to a wider shape of the particle RTD curve and a larger mean particle residence *** back-mixing of particles increases with increasing pressure,resulting in an increase in the axial dispersion coefficient.

关键词： Pressurized circulating fluidized bed MP-PIC method Residence time distribution Axial dispersion coefficient

Comparative study of two fluid model and dense discrete phase model for simulations of gas-solid hydrodynamics in circulating fluidized beds

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Particuology 2021年第2期19卷 108-117页

作者： Ying Wu Daoyin Liu Jinding Hu jiliang ma Xiaoping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast UniversityNanjing 210096China

Computational fluid dynamics(CFD)has become a valuable tool to study the complex gas-solid hydrodynamics in the circulating fluidized bed(CFB).Based on the two fluid model(TFM)under the Eulerian-Eulerian framework and the dense discrete phase model(DDPM)under the Eulerian-Lagrangian framework,this work conducts the comparative study of the gas-solid hydrodynamics in a CFB riser by these two different *** show that DDPM could be used to predict gas-solid hydrodynamics in the circulating fluidized bed,and there are differences between TFM and DDPM,especially in the radial distribution profiles of solid *** analysis results show that the gas-solid drag model exhibits significant effects on the results for both the two *** specularity coefficient and the restitution coefficient in the TFM,as well as the reflection coefficient and the parcel number in the DDPM,exhibit less impact on the simulated results.

关键词： CFD simulation Circulating fluidized bed Gas-solid flow Two fluid model Dense discrete phase model

Operando modeling and measurements:Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO_(2)capture in real conditions

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Frontiers in Energy 2023年第3期17卷 380-389页

作者： Tianyi CAI Mengshi WANG Xiaoping CHEN Ye WU jiliang ma Wu ZHOU School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Thermal Control of Electronic Equipment and Advanced Combustion Laboratory of the Ministry of Industry and Information Technology School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Alkalicarbonate-based sorbents(ACSs),including Na_(2)CO_(3)-and K2CO_(3)-based sorbents,are promising for CO_(2)***,the complex sorbent components and operation conditions lead to the versatile kinetics of CO_(2)sorption on these *** paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions,facilitating the sorbent development,reactor design,and operation parameter *** reviewed the theoretical simulation achievements during the development of *** elucidated the findings obtained by utilizing density functional theory(DFT)calculations,ab initio molecular dynamics(AIMD)simulations,and classical molecular dynamics(CMD)simulations as *** hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas-solid mode to the gas-liquid mode,boosting the ***,it briefly introduced a machine learning(ML)approach as a promising method to aid sorbent ***,it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation *** proposed measurement system includes a micro fluidizedbed(MFB)reactor for kinetic analysis,a multi-camera sub-system for 3D particle movement tracking,and a combined Raman and IR sub-system for solid/gas components and temperature *** is believed that this system is useful to evaluate the real-time sorbent performance,validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO_(2)capture.

关键词： CO_(2)capture carbonation theoretical modeling operando techniques reaction visualization

Solids flow characteristics and circulation rate in an internally circulating fluidized bed

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Particuology 2021年第1期19卷 69-77页

作者： Jinding Hu Daoyin Liu Cai Liang jiliang ma Xiaoping Chen Tao Zhang Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096JiangsuChina Guodian Science and Technology Research Institute Nanjing 210031JiangsuChina

Internally circulating fluidized beds(ICFBs)enable effective control of the reactions and heat distribution in *** ICFB contains two or more connected fluidized regions with different gas velocities to promote controlled solid *** control of solid circulation rate(G_(0))is a critical *** recorded single particle trajectories by tracing a fluorescent particle,based on which particle flow behaviors were analyzed in different regions.G_(0)was obtained for a wide range of operating *** increase in gas velocity in the down-and upflow beds shortened the particle circulation time in both beds and G_(0)increased *** the static bed height increased,the differential pressure on both sides of the circulation port increased,which resulted in an increase in the solid circulation *** the orifice area increased,the flow resistance through the orifice decreased and thus the solid circulation rate increased.G_(0)increased with the decrease in particle *** gas velocity in the upflowing bed and orifice area was the most important parameter to control the solid circulation rate.G_(0)was compared with the experimental measurements in literature and predictions using the correlation based on Bernoulli’s equation,and they agreed well.

关键词： Internally Circulating Fluidized bed Particle tracing Solid circulation rate

Cuprous oxide/copper oxide interpenetrated into ordered mesoporous cellulose-based carbon aerogels for efficient photocatalytic degradation of methylene blue

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 918-929页

作者： Rui Cui Dongnv Jin Gaojie Jiao Zhendong Liu jiliang ma Runcang Sun Liaoning Key Lab of Lignocellulose Chemistry and Biomaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

The casual discharge of dyes from industrial settings has seriously polluted global water *** to the abundance of biomass resources,preparing photocatalysts for photocatalytic degradation of dyes is significant;however,it still remains *** this work,a cuprous oxide/copper oxide composite was interpenetrated onto carbon nanosheets of cellulose-based flexible carbon aerogels(Cu_(2)O/CuO@CAx)via a simple freeze-drying-calcination *** introduction of the carbon aerogel effectively prevents the aggregation of the cuprous oxide/copper oxide *** addition,Cu_(2)O/CuO@CA0.2 has a larger specific surface area,stronger charge transfer capacity,and lower recombination rate of photogenerated carriers than copper ***,Cu_(2)O/CuO@CA0.2 exhibited high photocatalytic activity in decomposing methylene blue,with a degradation rate reaching up to 99.09% in 60 *** active oxidation species in the photocatalytic degradation process were systematically investigated by electron spin resonance characterization and poisoning experiments,among which singlet oxygen played a major *** conclusion,this work provides an effective method for preparing photocatalysts using biomass resources in combination with different metal *** also promotes the development of photocatalytic degradation of dyes.

关键词： carbon aerogel photocatalysis dye degradation biomass cuprous oxide copper oxide