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Fluidization of micro-interconnected fluidized beds for chemical looping

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Particuology 2021年第1期19卷 136-145页

作者： Tianxu shen Xiao Zhu Tao Song laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210042China

The micro-interconnected fluidized bed(MIFB)was designed to improve the evaluation condition of oxygen carrier,which is difficult to perform in a lab-scale interconnected fluidized bed because of the large demand for bed *** reduction of bed inventory in the MIFB was mainly achieved by the appropriate miniaturization of the reactor size,in which the wall effect and operating flexibility should be taken into *** hematite serving as the oxygen carrier,stable and flexible fluidization could be realized with 342.9 g of bed *** perforated plates were arranged in the middle of the reactor to improve gas-solid distribution,which also could restrain the slugging formation and increase the particle residence time by 28.9%.A different fluidization phenomenon was observed in this two-stage reactor in which the particle fluidization was reconstructed in the upper *** 48 h of cold operation,the hematite oxygen carrier attrition rate was evaluated as 0.151 wt.%/h corresponding to 660 h lifetime,where 12.5%of particle attrition was contributed by internal perforated *** excellent fitting performance was found between the pressure difference in the risers and the upward particle flow,but the correction factor should be adjusted according to the fluidization flow.

关键词： Micro chemical-looping reactor Bed inventory Internal perforated plate Hydrodynamics

Technical assessment of synthetic natural gas (SNG) production from agriculture residuals

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Journal of Thermal Science 2013年第4期22卷 359-365页

作者： Guohui Song Fei Feng Jun Xiao laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Department of Mechanical Technology Nanjing College of Chemical Technology

This paper presents thermodynamic evaluations of the agriculture residual-to-SNG process by thermochemical conversion, which mainly consists of the interconnected fluidized beds, hot gas cleaning, fluidized bed methanation reactor and Selexol absorption unit. The process was modeled using Aspen Plus soft-ware. The process performances, i.e., CH4 content in SNG~ higher heating value and yield of SNGexergy efficiencies with and without heat recovery, unit power consumption, were evaluated firstly. The results indicate that when the other parameters remain unchanged, the steam-to-biomass ratio at carbon boundary point is the optimal value for the process. Im proving the preheating temperatures of air and gasifying agent is beneficial for the SNG yield and exergy effi ciencies. Due to the effects of COz removal efficiency, there are two optimization objectives for the SNG produc tion process：（I） to maximize CH4 content in SNC or （II） to maximize SNG yield. Further, the comparison among different feedstocks indicates that the decreasing order of SNG yield is： corn stalk 〉 wheat straw 〉 rice straw. The evaluation on the potential of agriculture-based SNG shows that the potential annual production of agriculture re sidual-based SNG could be between 555 108 - 611 108 m3 with utilization of 100% of the available unexplored resources. The agriculture residual-based SNG could play a significant role on solving the big shortfall of China＇s natural gas supply in future.

关键词： synthetic natural gas agriculture residual biomass gasification methanation fluidized bed exergy

Effect of baffles on bubble behavior in a bubbling fluidized bed for chemical looping processes

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Particuology 2020年第6期18卷 154-167页

作者： Xiao Zhu Xuan Feng Yuanyuan Zou laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096China

A bubbling fluidized bed is generally used as the fuel reactor in chemical looping ***,in sufficient gas-solid contact remains a steadfast *** such,we propose the use of in ternal baffles to split bubbles at a high gas velocity and to restrict the movement of large-scale solids in the fluidized *** investigated the effect of baffle arrangement on the bubble size and energy,pressure gradient,particle distribution,and particle velocity in a fluidized bed using a computational particle fluid dynamics simulation based on our experimental *** discuss the main influenci ng factors,which in elude presence of caps,number of baffles,and the baffle opening *** baffle structure with caps efficiently broke the large bubbles without creating jet *** baffles were deemed suitable in the bed owing to the small bubble size and uniform gas-solid distribution in each *** selected a baffle opening ratio of 20.5%,which improved the flow pattern without causing a significant increase in the pressure gradient and particle velocity through the *** also discussed the potential for sea ling up this baffled fluidized bed for industrial applications.

关键词： Baffle Bubble behavior Fluidized bed Chemical looping CPFD simulations

Chemical looping catalytic gasification of biomass over active LaNixFe1-xO_(3)perovskites as functional oxygen carriers

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Chinese Journal of Chemical Engineering 2021年第8期34卷 146-156页

作者： Jingchun Yan Weidong Liu Rong Sun Shouxi Jiang shen Wang laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China College of Physics and New Energy Xuzhou University of TechnologyXuzhou 221018China

Oxygen carriers(OCs)with perovskite structure are attracting increasing interests due to their redox tunability by introducing various dopants in the *** this study,LaNixFe1-xO3(x=0,0.1,0.3,0.5,0.7,1.0)perovskite OCs have been prepared by a citric acid–nitrate sol–gel method,characterized by means of X-ray diffraction(XRD)analysis and tested for algae chemical looping gasification in a fixed bed *** effects of perovskite types,OC/biomass mass ratio(O/B),gasification temperature and water injection rate on the gasification performance were *** Ni-doped(0≤x≤0.5)perovskites crystalized in the rhombohedra system which was isostructural with LaNiO3,while those with composition 0.5≤x≤1 crystalized in the orthorhombic *** the high reactivity for LaNiO_(3),LaNi_(0.5)Fe_(0.5)O_(3)(LN5F5)was found to be more stable at a high temperature and give almost as good results as LaNiO_(3)in the formation of *** relatively higher syngas yield of 0.833 m^(3)·kg^(-1) biomass was obtained under the O/B of 0.4,water injection rate of 0.3 ml·min^(-1) and gasification temperature at 850*** high yield of syngas was achieved during the first 5 redox cycles,while a slight decrease in the reactivity for LN5F5 after 5 cycles was observed due to the adhesion of small grains occurring on the surface of ***,an obvious improvement in the gasification performance was attained for LN5F5 compared to raw biomass direct gasification,indicating that LN5F5 is a promising functional OC for chemical looping catalytic gasification of biomass.

关键词： Biomass Chemical looping gasification Oxygen carrier La-Ni-Fe perovskite Catalysis

Simulation and energy performance assessment of CO_2 removal from crude synthetic natural gas via physical absorption process

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Journal of Natural Gas Chemistry 2012年第6期21卷 633-638页

作者： Wanjun Guo Fei Feng Guohui Song Jun Xiao laihong shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096JiangsuChina Department of Mechanical Technology Nanjing College of Chemical TechnologyNanjing 210048JiangsuChina

The paper presents an energy performance assessment of CO2 removal for crude synthetic natural gas （SNG） upgrade by Selexol absorption process. A simplified process simulation of the Selexol process concerning power requirement and separation performance was developed. The assessment indicates that less pressure difference between crude SNG and absorption pressure favors the energy performance of CO2 removal process. When both crude SNG and absorption pressures are 20 bar, CO2 removal process has the best energy performance. The optimal specific power consumption of the CO2 removal process is 566 kJ/kgCO2. The sensitivity analysis shows that the CO2 removal efficiency would significantly influence the total power consumption of the removal process, as well as higher heating value （HHV） and CO2 content in SNG. However, the specific power consumption excluding crude SNG and SNG compressions changes little with the variance of CO2 removal efficiency. If by-product CO2 is compressed for CO2 capture, the process would turn into a CO2-sink for the atmosphere. Correspondingly, an increase of 281 kJ/kgCO2 in specific power consumption is required for compressing the separated CO2.

关键词： CO2 removal physical absorption synthetic natural gas power consumption

Chemical looping combustion of coal in interconnected fluidized beds

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Science China(Technological Sciences) 2007年第2期50卷 230-240页

作者： shen laihong ZHENG Min XIAO Jun ZHANG Hui XIAO Rui Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education Southeast UniversityNanjing 210096China

Chemical looping combustion is the indirect combustion by use of oxygen carrier. It can be used for CO2 capture in power generating processes. In this paper, chemical looping combustion of coal in interconnected fluidized beds with inherent separation of CO2 is proposed. It consists of a high velocity fluidized bed as an air reactor in which oxygen carrier is oxidized, a cyclone, and a bubbling fluidized bed as a fuel reactor in which oxygen carrier is reduced by direct and indirect reactions with coal. The air reactor is connected to the fuel reactor through the cyclone. To raise the high carbon conversion efficiency and separate oxygen carrier particle from ash, coal slurry instead of coal particle is introduced into the bottom of the bubbling fluidized bed. Coal gasification and the reduction of oxygen carrier with the water gas take place simultaneously in the fuel reactor. The flue gas from the fuel reactor is CO2 and water. Almost pure CO2 could be obtained after the condensation of water. The reduced oxygen carrier is then returned back to the air reactor, where it is oxidized with air. Thermodynamics analysis indicates that NiO/Ni oxygen carrier is the optimal one for chemical looping combustion of coal. Simulation of the processes for chemical looping combustion of coal, including coal gasification and reduction of oxygen carrier, is carried out with Aspen Plus software. The effects of air reactor temperature, fuel reactor temperature, and ratio of water to coal on the composition of fuel gas, recirculation of oxygen carrier particles, etc., are discussed. Some useful results are achieved. The suitable temperature of air reactor should be between 1050–1150°C and the optimal temperature of the fuel reactor be between 900–950°C.

关键词： chemical looping combustion coal interconnected fluidized beds CO2 separation

Petroleum coke conversion behavior in catalyst-assisted chemical looping combustion

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2417-2424页

作者： Xianyu Liu Huijun Ge Shiwei Ma Shangyi Yin Ping Lu laihong shen Hongcun Bai Wei Wang Tao Song School of Energy and Mechanical Engineering Nanjing Normal UniversityNanjing 210023China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China SUMEC Complete Equip.&Eng.Co. LtdNanjing210018China

Efficiently using petroleum coke as fuel and reducing carbon emission meanwhile have become attractive in oil processing *** paper is focused on the application of Chemical Looping Combustion(CLC)with petroleum coke,with the purpose of investigating its combustion performance and effects of *** experiments were performed in a laboratory scale fluidized bed facility with a natural manganese-based oxygen *** results indicated that the coke conversion is very sensitive to reaction *** pre sent natural manganese-based oxygen carrier decorated by K has little effect on the improvement of coke ***,SEM-EDX,and H2-TPR were adopted to characterize the reacted oxygen carrier *** being decorated by K,the oxygen carrier's capacity of transferring oxygen was decrea sed.A calcination temperature above the melting point of K2 CO3(891℃)shows better oxygen transfer reactivity in comparison to the one calcined at a lower *** natural oxygen carrier used in the work has a high content of Si,which can easily react with K to form K(FeSi2 O6).Further,irrespective of reaction temperature,the coke conversion can be significantly enhanced by decorating the coke with K,with a demonstration of remarkably shorter reaction time,faster average coke gasification rate and higher average carbon conversion rate.

关键词： Chemical looping combustion Oxygen carrier Catalyst Coke

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燃煤循环流化床模型与试验研究

热能动力工程 2000年第3期15卷 249-251,259页

作者：沈来宏东南大学热能工程研究所江苏南京210096

利用循环流化床内气 -固两相流动等基础方面的研究成果 ,根据本文床内气固浓 -淡流动模型 ,建立适用不同结构参数的循环流化床燃烧模型 ,考虑了床内气体、固体颗粒的返混、循环过程 ,以及煤燃烧、NO的生成和分解、颗粒磨损等因素。在循... 详细信息

利用循环流化床内气 -固两相流动等基础方面的研究成果 ,根据本文床内气固浓 -淡流动模型 ,建立适用不同结构参数的循环流化床燃烧模型 ,考虑了床内气体、固体颗粒的返混、循环过程 ,以及煤燃烧、NO的生成和分解、颗粒磨损等因素。在循环流化床燃烧试验台上进行实验研究 ,模型仿真结果和实验数据吻合良好 ,表明气固两相浓

关键词：煤循环流化床燃烧燃煤锅炉数学模型试验

铜基载氧体在化学链燃烧中的循环反应特性研究

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工程热物理学报 2024年第1期45卷 279-285页

作者：朱晓沈来宏南京工业职业技术大学南京210023 能源热转换及其过程测控教育部重点实验室东南大学南京210096

载氧体在长周期的化学链燃烧中存在严重的烧结与团聚问题,极大限制了化学链燃烧的工业化进展。本文采用流化床结晶造粒的方法,制备出一种高比表面积的铜基载氧体,在流化床热重分析仪(fluidized bed thermogravimetric analyzer,FBTGA)... 详细信息

载氧体在长周期的化学链燃烧中存在严重的烧结与团聚问题,极大限制了化学链燃烧的工业化进展。本文采用流化床结晶造粒的方法,制备出一种高比表面积的铜基载氧体,在流化床热重分析仪(fluidized bed thermogravimetric analyzer,FBTGA)上对其进行了长期化学链燃烧(chemical looping combustion,CLC)循环测试,并对反应前后的载氧体颗粒进行了还原反应实验。实验结果表明,所制备载氧体在900℃的高温下氧化还原循环120次后,其反应活性保持稳定,且并未出现明显的烧结与团聚迹象。对循环前后的载氧体颗粒进行形貌表征分析可知,此种Cu基载氧体的比表面积高达40 m^(2)/g以上,展现出良好的反应活性。此外,载氧体主要成分由CuAl_(2)O_(4)分解为Al_(2)O_(3)和CuO,其循环后仍呈光滑的球形颗粒,并维持多孔结构,活性组分Cu在颗粒表面高度分散。

关键词：化学链燃烧铜基载氧体流化床热重分析仪烧结与团聚