CO_2稀释天然气高压燃烧特性数值模拟
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摘要
为了研究惰性气体稀释气体燃料高压燃烧后NO_x的排放规律,通过数值模拟计算的方法研究了CO_2稀释天然气在燃气轮机燃烧室内的高压燃烧特性。结果表明:各种压力下燃烧区域温度随着稀释率的增大明显降低,且燃烧区域高度也有所降低,燃烧提前;通过CO_2稀释天然气燃烧在一定的稀释率以内可以很好地控制NO_x的排放量,但超过这个稀释率NO_x排放量会上升;在高压下通过CO_2稀释天然气燃烧相对于低压时更容易控制NO_x的排放量。
In order to study the emission rule of nitrogen oxides after high-pressure combustion of gaseous fuel diluted with inert gas, the high-pressure combustion characteristics of natural gas diluted with carbon dioxide in the gas turbine combustion chamber were studied by numerical simulation calculation. The results show that the temperature of the burning area decreases with the increase of the dilution rate, and the burning area height is also reduced. Moreover, the emissions of nitrogen oxide diluted with carbon dioxide can be well controlled within a certain dilution rate range, but nitrogen oxide emissions will rise it exceeds the dilution rate. In addition, it is also more easier to control nitrogen oxide emissions by the dilution of carbon dioxide during combustion of natural gas at higher pressures.
In order to study the emission rule of nitrogen oxides after high-pressure combustion of gaseous fuel diluted with inert gas, the high-pressure combustion characteristics of natural gas diluted with carbon dioxide in the gas turbine combustion chamber were studied by numerical simulation calculation. The results show that the temperature of the burning area decreases with the increase of the dilution rate, and the burning area height is also reduced. Moreover, the emissions of nitrogen oxide diluted with carbon dioxide can be well controlled within a certain dilution rate range, but nitrogen oxide emissions will rise it exceeds the dilution rate. In addition, it is also more easier to control nitrogen oxide emissions by the dilution of carbon dioxide during combustion of natural gas at higher pressures.
引文
[1]艾延廷,刘晓振,王成军,等.燃烧室热-声-固耦合数值模拟研究[J].科学技术与工程,2017,17(6):301-307.AI Yanting,LIU Xiaozhen,WANG Chengjun,et al.Numerical investigation of thermal-acoustic-structural coupling in combustion chamber[J].Science Technology and Engineering,2017,17(6):301-307.
[2]张成毅,李帆,荣庆兴.天然气燃烧的低NOx排放研究现状和趋势[J].上海煤气,2005,49(4):31-34.ZHANG Chengyi,LI Fan,RONG Qingxing.Research status and trend of low NOx emission from natural gas combustion[J].Shanghai Gas,2005,49(4):31-34.
[3]杨浩林,赵黛青,鲁冠军.CO2稀释燃料对富氧扩散燃烧中NOx生成的抑制作用[J].热能动力工程,2006,21(1):43-47.YANG Haolin,ZHAO Daiqing,LU Guanjun.Inhibitory effect of CO2 diluted fuel on NOx formation in oxygen diffusion burning[J].Journal of Engineering for Thermal Energy and Power,2006,21(1):43-47.
[4]KORAKIANITIS T,NAMASIVAYAM A M,CROOKESR J.Natural-gas fueled spark-ignition(SI)and compression-ignition(CI)engine performance and emissions[J].Progress in Energy&Combustion Science,2011,37(1):89-112.
[5]余小草,刘忠长,王忠恕,等.不同稀释方式降低天然气发动机NOx排放的研究[J].内燃机工程,2012,33(6):22-27.YU Xiaocao,LIU Zhongchang,WANG Zhongshu,et al.Research on NOx emission reduction of CNG engine by various dilution methods[J].Chinese Internal Combustion Engine Engineering,2012,33(6):22-27.
[6]HU E,HUANG Z,LIU B,et al.Experimental study on combustion characteristics of a spark-ignition engine fueled with natural gas-hydrogen blends combining with EGR[J].International Journal of Hydrogen Energy,2009,34(2):1035-1044.
[7]王金华,张猛,黄佐华,等.高温高压下CO2和H2O稀释对预混湍流火焰前锋面结构影响[C].中国内燃机学会燃烧净化节能分会2013年学术年会,2013.WANG Jinhua,ZHANG Meng,HUANG Zuohua,et al.Effect of the dilution of CO2 and H2O on pre-mixed turbulent flame front structure under high temperature and high pressure[C].Annual Conference of Combustion Purification and Energy Conservation Branch of China Association of Internal Combustion Engines,2013.
[8]李骏,徐敏,刘豪,等.O2/CO2气氛下CH4火焰温度特性的实验研究[J].华中科技大学学报(自然科学版),2002,30(10):17-19.LI Jun,XU Min,LIU Hao,et al.Experimental study of temperature characteristics of CH4 flame under O2/CO2atmosphere[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2002,30(10):17-19.
[9]KALICKA Z,JERZAK W,CEBULA E K.The effect of combustion of natural gas with 21%~29%O2/CO2/N2mixtures on emission of carbon monoxide[J].Archives of Environmental Protection,2013,39(4):93-103.
[10]张宏飞,曹红松,赵捍东,等.数值仿真中湍流模型的选择[J].弹箭与制导学报,2006,26(4):242-244.ZHANG Hongfei,CAO Hongsong,ZHAO Handong,et al.Selection of turbulence model in numerical simulation[J].Journal of Projectiles,Rockets,Missiles and Guidance,2006,26(4):242-244.
[11]张志伟,刘建军.各种湍流模型在FLUENT中的应用[J].河北水利,2008(10):25-26.ZHANG Zhiwei,LIU Jianjun.Application of various turbulence models in Fluent[J].Hebei Water Resources,2008(10):25-26.
[12]李进良,李承曦,胡仁喜.精通FLUENT 6.3流场分析[M].北京:化学工业出版社,2009:46.LI Jinliang,LI Chengxi,HU Renxi.Proficient in Fluent6.3 flow field analysis[M].Beijing:Chemical Industry Press,2009:46.
[13]周扬.天然气径向旋流预混高压燃烧特性研究[D].北京:华北电力大学,2016:33.ZHOU Yang.Research on premixed combustion characteristics of natural gas with radial-swirler at high pressure[D].Beijing:North China Electric Power University,2016:33.(责任编辑马昕红)
[2]张成毅,李帆,荣庆兴.天然气燃烧的低NOx排放研究现状和趋势[J].上海煤气,2005,49(4):31-34.ZHANG Chengyi,LI Fan,RONG Qingxing.Research status and trend of low NOx emission from natural gas combustion[J].Shanghai Gas,2005,49(4):31-34.
[3]杨浩林,赵黛青,鲁冠军.CO2稀释燃料对富氧扩散燃烧中NOx生成的抑制作用[J].热能动力工程,2006,21(1):43-47.YANG Haolin,ZHAO Daiqing,LU Guanjun.Inhibitory effect of CO2 diluted fuel on NOx formation in oxygen diffusion burning[J].Journal of Engineering for Thermal Energy and Power,2006,21(1):43-47.
[4]KORAKIANITIS T,NAMASIVAYAM A M,CROOKESR J.Natural-gas fueled spark-ignition(SI)and compression-ignition(CI)engine performance and emissions[J].Progress in Energy&Combustion Science,2011,37(1):89-112.
[5]余小草,刘忠长,王忠恕,等.不同稀释方式降低天然气发动机NOx排放的研究[J].内燃机工程,2012,33(6):22-27.YU Xiaocao,LIU Zhongchang,WANG Zhongshu,et al.Research on NOx emission reduction of CNG engine by various dilution methods[J].Chinese Internal Combustion Engine Engineering,2012,33(6):22-27.
[6]HU E,HUANG Z,LIU B,et al.Experimental study on combustion characteristics of a spark-ignition engine fueled with natural gas-hydrogen blends combining with EGR[J].International Journal of Hydrogen Energy,2009,34(2):1035-1044.
[7]王金华,张猛,黄佐华,等.高温高压下CO2和H2O稀释对预混湍流火焰前锋面结构影响[C].中国内燃机学会燃烧净化节能分会2013年学术年会,2013.WANG Jinhua,ZHANG Meng,HUANG Zuohua,et al.Effect of the dilution of CO2 and H2O on pre-mixed turbulent flame front structure under high temperature and high pressure[C].Annual Conference of Combustion Purification and Energy Conservation Branch of China Association of Internal Combustion Engines,2013.
[8]李骏,徐敏,刘豪,等.O2/CO2气氛下CH4火焰温度特性的实验研究[J].华中科技大学学报(自然科学版),2002,30(10):17-19.LI Jun,XU Min,LIU Hao,et al.Experimental study of temperature characteristics of CH4 flame under O2/CO2atmosphere[J].Journal of Huazhong University of Science and Technology(Natural Science Edition),2002,30(10):17-19.
[9]KALICKA Z,JERZAK W,CEBULA E K.The effect of combustion of natural gas with 21%~29%O2/CO2/N2mixtures on emission of carbon monoxide[J].Archives of Environmental Protection,2013,39(4):93-103.
[10]张宏飞,曹红松,赵捍东,等.数值仿真中湍流模型的选择[J].弹箭与制导学报,2006,26(4):242-244.ZHANG Hongfei,CAO Hongsong,ZHAO Handong,et al.Selection of turbulence model in numerical simulation[J].Journal of Projectiles,Rockets,Missiles and Guidance,2006,26(4):242-244.
[11]张志伟,刘建军.各种湍流模型在FLUENT中的应用[J].河北水利,2008(10):25-26.ZHANG Zhiwei,LIU Jianjun.Application of various turbulence models in Fluent[J].Hebei Water Resources,2008(10):25-26.
[12]李进良,李承曦,胡仁喜.精通FLUENT 6.3流场分析[M].北京:化学工业出版社,2009:46.LI Jinliang,LI Chengxi,HU Renxi.Proficient in Fluent6.3 flow field analysis[M].Beijing:Chemical Industry Press,2009:46.
[13]周扬.天然气径向旋流预混高压燃烧特性研究[D].北京:华北电力大学,2016:33.ZHOU Yang.Research on premixed combustion characteristics of natural gas with radial-swirler at high pressure[D].Beijing:North China Electric Power University,2016:33.(责任编辑马昕红)