燃气轮机燃料轴向分级燃烧室的数值分析
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摘要
为改善燃气轮机燃烧室的火焰筒壁温较高以及污染物排放等问题,提出了在火焰筒的壁面增加二次燃料喷口的轴向分级燃烧模式。利用ANSYS CFX软件并根据化学反应机理计算和分析了燃气轮机轴向分级燃烧室的流场和温度场,并与非分级燃烧室的结果进行了比较。结果表明:增大二次燃料比例可以使火焰筒壁面温度降低、出口污染物质量分数及出口不均匀系数减小,但出口平均温度会随之降低,导致做功能力减小。过量空气系数会影响火焰筒壁温、出口平均温度与NO质量分数。合理的二次燃料比例区间取决于多个条件。
Axially-staged combustion was proposed by feeding secondary fuel into the combustor in order to improve the high wall temperature and pollutant emmission in a gas turbine combustor.With detailed chemical kinetic mechanism, the flow field and temperature field of the axiallystaged combustor in a gas turbine were calculated and analyzed using ANSYS CFX software,which were comparied with those of the non-staged combustior. It was found that the wall temperature of flame tube, the mass fraction of outlet pollutant and the uneven coefficient of outlet temperature decreased with the increase of secondary fuel ratio. However, the average outlet temperature decreased as well, which resulted in the decline of work capacity. In addition, the results showed that the excess air coefficient affected the wall temperature of flame tube, the average outlet temperature and the mass fraction of NO. Therefore, the range concerning the appropriate secondary fuel ratio depended on several conditions.
Axially-staged combustion was proposed by feeding secondary fuel into the combustor in order to improve the high wall temperature and pollutant emmission in a gas turbine combustor.With detailed chemical kinetic mechanism, the flow field and temperature field of the axiallystaged combustor in a gas turbine were calculated and analyzed using ANSYS CFX software,which were comparied with those of the non-staged combustior. It was found that the wall temperature of flame tube, the mass fraction of outlet pollutant and the uneven coefficient of outlet temperature decreased with the increase of secondary fuel ratio. However, the average outlet temperature decreased as well, which resulted in the decline of work capacity. In addition, the results showed that the excess air coefficient affected the wall temperature of flame tube, the average outlet temperature and the mass fraction of NO. Therefore, the range concerning the appropriate secondary fuel ratio depended on several conditions.
引文
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[2]YAMAMOTO T,LIOR N,FURUHATA T,et al.Anovel high-performance low-NOx fuel-rich/fuel-lean two-stage combustion gas and steam turbine system for power and heat generation[J].Proceedings of the Institution of Mechanical Engineers,Part A:Journal of Power and Energy,2007,221(4):433-446.
[3]程勇,汪军.微型燃气轮机燃烧室内三维流动过程的数值模拟[J].上海理工大学学报,2004,26(5):425-428.
[4]陈占军,金晶,樊俊杰,等.超细煤粉燃烧NOx析出特性试验[J].上海理工大学学报,2005,27(1):6-10.
[5]张海军,陈永辰,郭雪岩.燃烧模型对甲烷/空气非预混数值模拟的影响[J].上海理工大学学报,2009,31(5):483-488.
[6]黄明明,张哲巅,邵卫卫,等.低排放分级燃烧器中CH4燃烧特性[J].燃气轮机技术,2013,26(1):33-39.
[7]TUMA J,KUBATA J,BETAK V,et al.Experimental and numerical research of a novel combustion chamber for small gas turbine engines[C]//Proceedings of EDPWeb of Conferences.Czech:EDP,2013:01091.
[8]吴鑫楠,王辉,张文军,等.二次燃料喷射对燃气轮机中低热值燃烧室性能的影响[J].燃气轮机技术,2014,27(4):17-22.
[9]HAN D S,KIM G B,KIM H S,et al.Experimental study of NOx correlation for fuel staged combustion using lab-scale gas turbine combustor at high pressure[J].Experimental Thermal and Fluid Science,2014,58:62-69.
[10]CRISMARU I V,DRAGOMIR-STANCIU D.The influence of the flame stabilization air intake holes diameter on the no production in an industrial gas turbine[J].Procedia Technology,2015,19:730-736.
[11]王能,刘石.微型燃气轮机富氧燃烧室数值及试验研究[J].燃烧科学与技术,2014,20(3):276-282.
[12]CALABRIA R,CHIARIELLO F,MASSOLI P,et al.Numerical study of a micro gas turbine fed by liquid fuels:potentialities and critical issues[J].Energy Procedia,2015,81:1131-1142.
[13]DE OLIVEIRA RODRIGUES L,DO NASCIMENTOM A R.Pre-mixed and diffusion flames assessment using CFD tool for natural gas and biogas fuels in gas turbine combustion chambers[J].WSEAS Transactions on Fluid Mechanics,2009,4(2):73-84.
[14]PRAVEEN C U,YADAV A H K.Numerical simulation of gas turbine can combustor engine[J].International Journal of Engineering Research and General Science,2015,3(5):192-201.
[15]DIAS F L G,DO NASCIMENTO M A R,DEOLIVEIRA RODRIGUES L.Reference area investigation in a gas turbine combustion chamber using CFD[J].Journal of Mechanical Engineering and Automation,2014,4(2):73-82.