模型辅助的合成气化学链燃烧操作优化
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摘要
基于Abad等的模型,模拟了Cu14Al-I氧载体与合成气(CO+H_2)在500,Wth流化床的燃料反应器中的反应过程,并根据模拟结果对该系统中合成气的燃烧过程进行优化.对于反应动力学,使用合成气中CO和H2叠加的反应速率代替整体反应速率能够较好地预测实验结果.经过与实验的对比,证实了该反应器模型能够准确模拟Cu14Al-I氧载体与合成气的反应过程.模拟结果显示,合成气成分、反应温度、氧载体循环流率等参数对流化床的运行均有一定的影响.合成气中2CO Hn/n由1∶1升高至3∶1时,燃料的燃烧性能有所降低.较高的操作温度有利于合成气的燃烧,当温度为900,℃时,?=1.5即可实现合成气的完全燃烧.较高的固体循环流率下,不利于合成气的充分燃烧.最后,基于模拟结果对流化床进行了优化:当温度为850,℃时,各运行参数应调整为Fs=6.7,kg/h、?=1.8、氧载体转化率Xs=0.73,才能使500,Wth流化床的燃料反应器中合成气达到最佳的燃烧效果.
Based on the fluidized bed model developed by Abad et al,the combustion of syngas(CO+H2)with Cu14 Al-I oxygen carrier was simulated,and the simulation results were then used for optimization.For reaction kinetics in the reactor model,it was found that the summation of the rates for reactive components(CO and H_2)can be used for better prediction of TGA data.Afterwards,the reactor model was validated against the experimental data obtained from the 500,Wth pilot plant.The modeling results show that the syngas composition,temperature,oxygen carrier circulation rate have impacts on the combustion performance of syngas.For2 CO Hn/n from 1∶1 to 3∶1,higher 2 CO Hn/n ratio is disadvantageous for combustion.Higher temperature can assist the combustion,thus ф=1.5 is sufficient for complete combustion at 900,℃.Higher circulation rate of oxygen carrier is disadvantageous for syngas combustion.Finally,the optimization shows that at 850,℃ the operation parameters should be adjusted to Fs=6.7,kg/h,ф=1.8,Xs=0.73 to achieve the best performance of syngas combustion in the 500,Wth plant.
Based on the fluidized bed model developed by Abad et al,the combustion of syngas(CO+H2)with Cu14 Al-I oxygen carrier was simulated,and the simulation results were then used for optimization.For reaction kinetics in the reactor model,it was found that the summation of the rates for reactive components(CO and H_2)can be used for better prediction of TGA data.Afterwards,the reactor model was validated against the experimental data obtained from the 500,Wth pilot plant.The modeling results show that the syngas composition,temperature,oxygen carrier circulation rate have impacts on the combustion performance of syngas.For2 CO Hn/n from 1∶1 to 3∶1,higher 2 CO Hn/n ratio is disadvantageous for combustion.Higher temperature can assist the combustion,thus ф=1.5 is sufficient for complete combustion at 900,℃.Higher circulation rate of oxygen carrier is disadvantageous for syngas combustion.Finally,the optimization shows that at 850,℃ the operation parameters should be adjusted to Fs=6.7,kg/h,ф=1.8,Xs=0.73 to achieve the best performance of syngas combustion in the 500,Wth plant.
引文
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[16]Forero Carmen Rosa,Gayán Pilar,de Diego Luis Francisco,et al.Syngas combustion in a 500,Wthchemical-looping combustion system using an impregnated Cu-based oxygen carrier[J].Fuel Processing Technology,2009,90(12):1471-1479.
[17]Abad Alberto,Adánez Juan,García-Labiano Francisco,et al.Modeling of the chemical-looping combustion of methane using a Cu-based oxygen carrier[J].Energy Procedia,2009,157(3):391-398.
[18]Johnsson Filip,Andersson S,Leckner Bo.Expansion of a freely bubbling fluidized bed[J].Powder Technology,1991,68(2):117-123.
[19]Lewis Warren K,Gilliland Edwin R,Lang P M.Entrainment from fluidized beds[J].Chemical Engineering Progress Symposium Series,1962,58(38):65-78.
[2]代尧,刘训良,楼国锋,等.移动床内合成气化学链燃烧反应的实验研究[J].工程热物理学报,2016,37(10):2253-2257.Dai Yao,Liu Xunliang,Lou Guofeng,et al.Experimental study on syngas chemical looping combustion in a moving bed[J].Journal of Engineering Thermophysics,2016,37(10):2253-2257(in Chinese).
[3]顾海明,沈来宏,吴家桦,等.基于赤铁矿载氧体的煤化学链燃烧试验[J].化工学报,2011,62(1):179-185.Gu Haiming,Shen Laihong,Wu Jiahua,et al.Experiments on chemical looping combustion of coal with hematite as oxygen carrier[J].CIESC Journal,2011,62(1):179-185(in Chinese).
[4]Mattisson Tobias,Lyngfelt Anders,Leion Henrik.Chemical-looping with oxygen uncoupling for combustion of solid fuels[J].International Journal of Greenhouse Gas Control,2009,3(1):11-19.
[5]梅道锋,赵海波,马兆军,等.铜基氧载体化学链氧解耦的流化床实验研究[J].燃烧科学与技术,2013,19(1):15-20.Mei Daofeng,Zhao Haibo,Ma Zhaojun,et al.Fluidized bed reactor investigation of copper-based oxygen carrier in chemical looping with oxygen uncoupling[J].Journal of Combustion Science and Technology,2013,19(1):15-20(in Chinese).
[6]Wolf Jens,Anheden Marie,Yan Jinyue.Performance of power generation processes with chemical-looping combustion for CO2 removals requirements for the oxidation and reduction reactors[C]//Proceedings of Interna-tional Pittsburgh Coal Conference.Newcastle,UK,2001:1-18.
[7]Jung Jonghwun,Gamwo Isaac K.Multiphase CFDbased models for chemical looping combustion process:Fuel reactor modeling[J].Powder Technology,2008,183(3):401-409.
[8]Deng Zhongyi,Xiao Rui,Jin Baosheng,et al.Multiphase CFD modeling for a chemical looping combustion process(fuel reactor)[J].Chemical Engineering&Technology,2008,31(12):1754-1766.
[9]苏明泽,赵海波,马琎晨,等.化学链燃烧串行流化床系统的热态CFD模拟[J].燃烧科学与技术,2015,21(4):363-369.Su Mingze,Zhao Haibo,Ma Jinchen,et al.CFD simulation for chemical looping combustion in dual circulation fluidized bed[J].Journal of Combustion Science and Technology,2015,21(4):363-369(in Chinese).
[10]Wang Shuai,Chen Juhui,Lu Huilin,et al.Multi-scale simulation of chemical looping combustion in dual circulating fluidized bed[J].Applied Energy,2015,155:719-727.
[11]Alobaid Falah,Ohlemüller Peter,Str?hle Jochen,et al.Extended Euler-Euler model for the simulation of a1,MWth chemical-looping pilot plant[J].Energy,2015,93(Part 2):2395-2405.
[12]Ohlemüller Peter,Alobaid Falah,Gunnarsson Adrian,et al.Development of a process model for coal chemical looping combustion and validation against100,k Wth tests[J].Applied Energy,2015,157:433-448.
[13]Abad Alberto,Adánez Juan,García-Labiano Francisco,et al.Modeling of the chemical-looping combustion of methane using a Cu-based oxygencarrier[J].Combustion and Flame,2010,157(3):602-615.
[14]Abad Alberto,Gayán Pilar,de Diego Luis Francisco,et al.Fuel reactor modelling in chemical-looping combustion of coal:1.Model formulation[J].Chemical Engineering Science,2013,87:277-293.
[15]Kolbitsch Philipp,Pr?ll Tobias,Hofbauer Hermann.Modeling of a 120 k W chemical looping combustion reactor system using a Ni-based oxygen carrier[J].Chemical Engineering Science,2009,64:99-108.
[16]Forero Carmen Rosa,Gayán Pilar,de Diego Luis Francisco,et al.Syngas combustion in a 500,Wthchemical-looping combustion system using an impregnated Cu-based oxygen carrier[J].Fuel Processing Technology,2009,90(12):1471-1479.
[17]Abad Alberto,Adánez Juan,García-Labiano Francisco,et al.Modeling of the chemical-looping combustion of methane using a Cu-based oxygen carrier[J].Energy Procedia,2009,157(3):391-398.
[18]Johnsson Filip,Andersson S,Leckner Bo.Expansion of a freely bubbling fluidized bed[J].Powder Technology,1991,68(2):117-123.
[19]Lewis Warren K,Gilliland Edwin R,Lang P M.Entrainment from fluidized beds[J].Chemical Engineering Progress Symposium Series,1962,58(38):65-78.