生物质气化与燃煤耦合发电系统能流和流分析
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摘要
生物质气化耦合燃煤发电可充分利用我国的生物质资源,减少煤炭的燃烧,改善能源结构,实现节能减排。为分析生物质气化-燃煤耦合发电系统能量流动及损失分布,基于热力学第一定律和热力学第二定律,建立了系统能流、流分析模型,计算得到系统能流和流图。结果表明:采用科学合理的燃气配气方式,锅炉燃烧稳定性几乎不受影响;额定工况、75%额定工况和50%额定工况下,系统能效分别为32.39%、31.93%和31.38%,效率分别为30.27%、31.83%和30.35%。生物质气化-燃煤耦合发电系统具有较高的能源利用效率,高于现有生物质直燃电厂发电项目的系统效率,技术经济效益明显。能损和损分析可为系统设计和优化奠定理论基础,也为生物质气化耦合燃煤锅炉发电的推广应用指明方向。
Biomass gasification coupled with coal-fired power generation can make full use of biomass resources in China,reduce coal combustion,improve energy structure,and achieve energy conservation and emission reduction.In order to analyze the energy flow and loss distribution of biomass gasification-coal fired coupling power generation system,based on the first law and the second law of thermodynamics,this paper establishes the energy flow and exergy flow analysis models to calculate energy flow and exergy flow diagram.The results show that when adopting scientific and reasonable gas distribution mode,the combustion stability of boiler is almost not affected;under the condition of the rated condition(THA),75%THA and 50%THA,the system energy efficiency are 32.39%,31.93% and 31.38%,and the exergy efficiency are 30.27%,31.83% and 30.35%.Biomass gasification coupled with coal-fired power generation system has higher energy efficiency than that of the existing biomass direct fired power plant project,and its technical and economic benefits are obvious.Energy loss and exergy loss analysis can lay a theoretical foundation for system design and optimization,and indicate the application direction of biomass gasification coupled with coal-fired power generation system.
Biomass gasification coupled with coal-fired power generation can make full use of biomass resources in China,reduce coal combustion,improve energy structure,and achieve energy conservation and emission reduction.In order to analyze the energy flow and loss distribution of biomass gasification-coal fired coupling power generation system,based on the first law and the second law of thermodynamics,this paper establishes the energy flow and exergy flow analysis models to calculate energy flow and exergy flow diagram.The results show that when adopting scientific and reasonable gas distribution mode,the combustion stability of boiler is almost not affected;under the condition of the rated condition(THA),75%THA and 50%THA,the system energy efficiency are 32.39%,31.93% and 31.38%,and the exergy efficiency are 30.27%,31.83% and 30.35%.Biomass gasification coupled with coal-fired power generation system has higher energy efficiency than that of the existing biomass direct fired power plant project,and its technical and economic benefits are obvious.Energy loss and exergy loss analysis can lay a theoretical foundation for system design and optimization,and indicate the application direction of biomass gasification coupled with coal-fired power generation system.
引文
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[15]李金玉.电站锅炉平衡计算分析[J].西安交通大学学报,1986,20(2):91-101.LI Jinyu.Exergy balance calculations for a power plant boiler[J].Journal of Xian Jiaotong University,1986,20(2):91-101.
[2]杨晋萍,史飞,张雁茹.电站燃煤锅炉掺烧生物质技术[J].中国电力,2010,19(10):31-35.YANG Jinping,SHI Fei,ZHANG Yanru.Technology of biomass cofiring in coal boiler of power station[J].ElectricPower,2010,19(10):31-35.
[3]吴国强,倪浩.生物质气化耦合燃煤锅炉对燃烧安全性的影响[J].科技创新与应用,2017(19):68-70.
[4]杜厚浩.生物质气化混燃发电气化炉系统自动控制研究[J].大陆桥视野,2016(18):173-175.
[5]倪浩,吴国强.大型火电耦合生物质气化发电技术方案分析[J].科技创新与应用,2017(19):37-38.
[6]周高强.燃煤与生物质气化耦合发电技术方案分析[J].内燃机与配件,2016(12):133-135.
[7]毛健雄.燃煤耦合生物质发电[J].分布式能源,2017,2(5):47-54.MAO Jianxiong.Cofiring biomass with coal for power generate[J].Distributed Energy,2017,2(5):47-54.
[8]孙锐.李文凯.燃煤与生物质耦合发电在我国的发展前景[C]//国际能源署洁净煤中心第七届燃煤生物质耦合发电国际会议,2017.
[9]刘华财,阴秀丽,吴创之.生物质气化发电能耗和温室气体排放分析[J].太阳能学报,2015,36(10):2553-2558.LIU Huacai,YIN Xiuli,WU Chuangzhi.Energy consumption and greenhouse gas emission of biomass gasification and power generation system[J].Acta Energiae Solaris Sinica,2015,36(10):2553-2558.
[10]何培红,沈冶,常平,等.10.8MW生物质气化再燃发电项目工业应用[C]//中国电机工程学会清洁高效发电技术协作网2014年会,2014.
[11]黄亚继,伏启让,牛淼淼,等.生物质流化床富氧气化过程热平衡模型[J].太阳能学报,2016,37(2):494-499.HUANG Yaji,FU Qirang,NIU Miaomiao,et al.Thermodynamic equilibrium model of biomass gasification process with enriched oxygen in fluidised bed gasifier[J].Acta Energiae Solaris Sinica,2016,37(2):494-499.
[12]李大中,王红梅,韩璞.流化床生物质气化动力学模型建立[J].华北电力大学学报(自然科学版),2008,35(1):4-8.LI Dazhong,WANG Hongmei,HAN Pu.Study on dynamic modeling method of biomass gasification on fluidized bed[J].Journal of North China Electric Power University(Natural Science Edition),2008,35(1):4-8.
[13]蒋受宝,蒋绍坚,张灿.生物质气化计算平衡模型[J].中南林业科技大学学报,2006,26(2):68-71.JANG Shoubao,JIANG Shaojian,ZHANG Can.A balance model for analyzing biomass gasification process[J].Journal of Central South Forestry University,2006,26(2):68-71.
[14]李大中.生物质发电气化过程建模及优化研究[D].保定:华北电力大学,2009.LI Dazhong.Modeling and optimization of biomass gasification process[D].Baoding:North China Electric Power University,2009.
[15]李金玉.电站锅炉平衡计算分析[J].西安交通大学学报,1986,20(2):91-101.LI Jinyu.Exergy balance calculations for a power plant boiler[J].Journal of Xian Jiaotong University,1986,20(2):91-101.