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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

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Experimental and Numerical Study of Heat Transfer Characteristicsof Supercritical CO_(2) in Rectangular Channel PCHE

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Journal of thermal Science 2024年第6期33卷 2299-2317页

作者： CHEN Yulin WU Xinwen SHAO Yingjuan ZHONG Wenqi Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Channel structure has a significant effect on the heat transfer performance of *** this study,a set of rectangular straight channel PCHEs with different cross-section aspect ratios had been tested on S-CO_(2) heat transfer experimental platform,the effect of mass flow rate in both cold and heat sides,as well as the cross-section aspect ratio of the rectangular straight channel,on the heat transfer performance of PCHE was *** results show that the comprehensive heat transfer performance of the rectangular cross-section is better than that of the semicircular cross-section;increasing the aspect ratio can improve the comprehensive heat transfer performance of PCHE,but the strengthening effect diminishes as the aspect ratio *** the mass flow rate on both sides not only enhances the pre-cooler's cooling capacity and heat transfer,but also raises the pressure *** addition,an improved heat transfer correlation for rectangular cross-section PCHE was proposed,considering the effects of cross-sectional aspect ratio and pseudo-critical temperature is proposed in the range of Re from 3169 to 48474 and Pr from 0.98 to 12.5,the fited results better predict the local Nu and f magnitudes and trends in the pre-cooler under different cooling conditions,outperforming the simulated data and Gnielinski and Blasius correlation.

关键词： S-CO_(2) rectangular PCHE pre-cooler performance analysis local flow heat transfer characteris

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Four-channel catalytic micro-reactor based on alumina hollow fiber membrane for efficient catalytic oxidation of CO

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Chinese Journal of Chemical Engineering 2024年第7期71卷 140-147页

作者： Baichuan Xu Bin Wang Tao Li Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211100China

The traditional automotive catalytic converter using commercial ceramic honeycomb carriers has many problems such as high back pressure,low engine efficiency,and high usage of precious *** study proposes a four-channel catalytic micro-reactor based on alumina hollow fiber membrane,which uses phase inversion method for structural molding and *** to the advantages of its carrier,it can achieve lower ignition temperature under low noble metal *** Pd/CeO_(2) at a loading rate of 2.3%(mass),the result showed that the reaction ignition temperature is even less than 160℃,which is more than 90℃ lower than the data of commercial ceramic substrates under similar catalyst loading and airspeed *** technology in turn significantly reduces the energy consumption of the *** stability tests were conducted under constant conditions for 1000 h,which proved that this catalytic converter has high catalytic efficiency and stability,providing prospects for the design of innovative catalytic converters in the future.

关键词： Catalytic converter Precious metal catalyst Phase inversion method Hollow fiber membrane CO oxidation

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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

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Supercritical CO_(2) Cycles for Nuclear-Powered Marine Propulsion:Preliminary Conceptual Design and Off-Design Performance Assessment

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Journal of thermal Science 2024年第1期33卷 328-347页

作者： LI Zhaozhi SHI Mingzhu SHAO Yingjuan ZHONG Wenqi Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Using the efficient,space-saving,and flexible supercritical carbon dioxide(sCO_(2)) Brayton cycle is a promising approach for improving the performance of nuclear-powered *** purpose of this paper is to design and compare sCO_(2) cycle power systems suitable for nuclear-powered *** the characteristics of nuclear-powered ships,this paper uses different indicators to comprehensively evaluate the efficiency,cost,volume,and partial load performance of several nuclear-powered sCO_(2) *** load-following strategies are also designed and *** results show that the partial cooling cycle is most suitable for nuclear-powered ships because it offers both high thermal efficiency and low volume and cost,and can maintain relatively high thermal efficiency at partial ***,the new load-following strategy that adjusts the turbine speed can keep the compressor away from the surge line,making the cycle more flexible and efficient compared to traditional inventory and turbine bypass strategies.

关键词： supercritical CO_(2)cycle nuclear marine propulsion off-design performance

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A fibrous hydroelectric generator derived from eco-friendly sodium alginate for low-grade energy harvesting

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Frontiers in energy 2024年第4期18卷 474-482页

作者： Feng GONG Jiaming SONG Haotian CHEN Hao LI Runnan HUANG Yuhang JING Peng YANG Junjie FENG Rui XIAO Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

With the development of renewable energy technologies,the recovery and utilization of low-grade energy based on hydroelectric effect have drawn much attention owing to its environmental ***,a novel hydroelectric generator utilizing sodium alginategraphene oxide(SA-GO)fibers is proposed,which is ecofriendly and *** fibers with a length of 5 cm and a diameter of 0.15 mm can generate an open circuit voltage(Voc)of approximately 0.25 V and a short circuit current(Isc)of 4µ*** connecting SA-GO fibers in either series or parallel,this combination can power some electronic ***,these fibers enable the recovery of low-grade energy from the atmosphere or around the human *** experimental and theoretical analysis confirm that the directional flow of protons driven by water molecules is the main mechanism for power generation of SA-GO *** study not only presents a simple energy transformation method that is expected to be applied to our daily life,but also provides a novel idea for the design of humidity electricity-generation devices.

关键词： fibrous hydroelectric generator sodium alginate(SA) graphene oxide(GO) power generation

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Synthesis of core-shell nanostructured SiO_(2)/TiO_(2)photocatalysts via atomic layer deposition in a fluidized bed with central tube

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Particuology 2024年第8期91卷 19-28页

作者： Wei Liu Daoyin Liu Zuyang Zhang Zhenkun Sun Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy&EnvironmentSoutheast UniversityNanjing 210096China

Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the *** this study,a fluidized bed with a central tube is designed,where the central tube has two roles:improve fluidization and deliver precursors *** synthesis of core-shell structured SiO_(2)/TiO_(2)nanoparticle catalysts for photodegradation of tetracycline hydrochloride(TC)is carried out using TiCl_(4)and H_(2)O as precursors at 180℃under atmospheric *** the combination of vibration and central tube,the segregation of agglomerate size along the bed height is weakened,and the prepared SiO_(2)/TiO_(2)nanoparticles show excellent photocatalytic degradation performance:the degradation efficiency on TC is 96%under 300 W xenon lamp irradiation for 60 *** mechanism of enhanced photocatalytic activity is due to the Ti-O-Si bonds generated at the interface,which increase the ability to absorb sunlight and accelerate the separation of holes and electrons.

关键词： SiO_(2)/TiO_(2)nanoparticles Fluidization Atomic layer deposition Photocatalysts Photocatalytic mechanism

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Plasma-assisted ammonia synthesis under mild conditions for hydrogen and electricity storage:Mechanisms,pathways,and application prospects

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Frontiers in energy 2024年第4期18卷 418-435页

作者： Feng GONG Yuhang JING Rui XIAO Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Ammonia,with its high hydrogen storage density of 17.7 wt.%(mass fraction),cleanliness,efficiency,and renewability,presents itself as a promising zero-carbon ***,the traditional Haber−Bosch(H−B)process for ammonia synthesis necessitates high temperature and pressure,resulting in over 420 million tons of carbon dioxide emissions annually,and relies on fossil fuel *** contrast,dielectric barrier discharge(DBD)plasma-assisted ammonia synthesis operates at low temperatures and atmospheric pressures,utilizing nitrogen and hydrogen radicals excited by energetic electrons,offering a potential alternative to the H−B *** method can be effectively coupled with renewable energy sources(such as solar and wind)for environmentally friendly,distributed,and efficient ammonia *** review delves into a comprehensive analysis of the low-temperature DBD plasma-assisted ammonia synthesis technology at atmospheric pressure,covering the reaction pathway,mechanism,and catalyst system involved in plasma nitrogen *** from current research,it evaluates the economic feasibility of the DBD plasmaassisted ammonia synthesis technology,analyzes existing dilemmas and challenges,and provides insights and recommendations for the future of nonthermal plasma ammonia processes.

关键词： plasma catalysis nitrogen fixation ammonia synthesis hydrogen storage catalyst carbon neutralization

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Numerical modelling and simulation analysis of wind blades:a critical review

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Clean energy 2024年第1期8卷 261-279页

作者： Ibrahim Alrowwad Xiaojia Wang Ningling Zhou Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Wind energy has emerged as a promising renewable energy source and wind turbine technology has developed rapidly in recent *** wind turbine performance depends heavily on the design and optimization of wind *** work offers a critical evaluation of the state of the art in the field of numerical modelling and simulation analysis,which have become crucial for the design and optimization of wind *** evaluation of the literature includes considerable research on the application of numerical methods for the structural and aerodynamic performance of wind blades under various operating situations,as well as for analysis and optimization of wind *** article illustrates how numerical techniques can be used to analyse wind blade performance and maximize design *** study of blade performance under various wind conditions has also been made possible through the use of simulation analysis,thus enhancing the efficiency and dependability of wind *** in wind turbine efficiency and dependability,and ultimately the move towards a more sustainable energy future,will be greatly helpful for the development of numerical modelling and simulation techniques.

关键词： wind blades simulations optimization numerical analysis mathematical modelling performance

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Effects of particle size reduction due to wear on heat transfer in a fluidized bed: A CFD-DEM study

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Particuology 2025年 103卷 176-192页

作者： Bo, Haoyuan Fu, Yao Shao, Yingjuan Zhong, Wenqi Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China

Particle wear behavior significantly affects combustion stability and operational costs. To reveal the underlying effects of particle size reduction on the heat transfer process, which are difficult to obtain experimentally, this study proposes a novel particle wear model. The model is experimentally calibrated and subsequently incorporated into a heat-fluid CFD-DEM platform. This is the first study to numerically investigate the impact of particle size reduction due to wear on the heat transfer characteristics in a fluidized bed. This study investigates the fluid dynamic and thermal behavior of particles after wear. It provides information on the system's macroscopic gas-solid flow regime (characterized by particle size and temperature distribution), the time-varying rules of particle wear and fragmentation rate, bed particle size distribution, and the relationship between single-particle diameter and temperature under different wear mechanisms. The primary innovation of this work lies in assessing the impact of different wear mechanisms on the key parameters (heating rate and temperature uniformity) during the heating process. Based on these findings, practical guidance is provided for optimizing industrial processes (adjusting particle flow patterns, optimizing debris distribution, and enhancing temperature monitoring at the bed bottom). The results reveal that different wear mechanisms lead to distinct distribution characteristics of particles within the bed. The abrasion mechanism enhances the heat transfer process, resulting in an approximately 16 % increase in the heating rate coefficient (C) and a 6 % improvement in temperature uniformity. In contrast, the fragmentation mechanism weakens the heat transfer process, leading to an approximately 33 % decrease in C and a 21 % reduction in temperature uniformity. © 2025

关键词： Industrial heating

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