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Study of the influence of water vapour and carbon dioxide dilution on pollutants emitted by swirled methane/oxygen-enriched air flames
Experimental Thermal and Fluid Science ( IF 2.8 ) Pub Date : 2021-07-19 , DOI: 10.1016/j.expthermflusci.2021.110483
A. Vandel 1 , J.P. Chica Cano 1, 2 , S. de Persis 2 , G. Cabot 1
Affiliation  

The effects of Exhaust Gas Recirculation (EGR) through the dilution by carbon dioxide and water vapour on methane flames/oxygen-enriched air in the case of the pressurized premixed combustion encountered in gas turbines are studied. The chosen configuration is a confined swirled premixed flame with a constant swirl number (Sn = 0.90). The input parameters are the initial temperature, adiabatic flame temperature, pressure (0.1 MPa), and the flow rates and concentrations of CH4, O2, CO2, H2O and N2. The pollutant emissions of NO and CO were measured at the exit of the combustion chamber and expressed as a volume fraction on dry gas. The gaseous emissions of NOx, CO, CO2 and O2 were measured by a HORIBA PG250 analyser, and in the case of high CO2 dilutions, the CO2 concentration measurements were made using a HORIBA VA-3000 analyser. The pollutant emissions were measured for the two initial temperatures T0 = 373 and 473 K and for the four adiabatic temperatures (1773, 1873, 1973 and 2073 K). Finally, the role of parameters (enrichment, diluent, equivalence ratio) likely to play a part in the production of CO and NO pollutant emissions was analyzed. The influence of the diluent on the emissions is highlighted. Dilution with CO2 decreases NO emissions but leads to an increase in CO. Dilution with water vapour is more attractive since at a constant adiabatic temperature, it leads to lower emissions of CO2, CO and NO.



中文翻译:

水蒸气和二氧化碳稀释对甲烷/富氧空气漩涡火焰排放污染物影响的研究

研究了在燃气轮机中遇到加压预混燃烧的情况下,通过二氧化碳和水蒸气的稀释,废气再循环 (EGR) 对甲烷火焰/富氧空气的影响。所选配置是具有恒定涡流数 (Sn = 0.90) 的受限涡流预混火焰。输入参数是初始温度、绝热火焰温度、压力(0.1 MPa)以及 CH 4、O 2、CO 2、H 2 O 和 N 2的流速和浓度。在燃烧室出口处测量 NO 和 CO 的污染物排放量,并表示为干气的体积分数。NOx、CO、CO 2和 O的气体排放2是通过 HORIBA PG250 分析仪测量的,并且在高 CO 2稀释的情况下,使用 HORIBA VA-3000 分析仪进行CO 2浓度测量。污染物排放是针对两个初始温度 T 0  = 373 和 473 K 以及四个绝热温度(1773、1873、1973 和 2073 K)测量的。最后,分析了可能在 CO 和 NO 污染物排放产生中起作用的参数(富集、稀释剂、当量比)的作用。稀释剂对排放的影响被突出显示。用 CO 2稀释减少 NO 排放,但导致 CO 增加。用水蒸气稀释更具吸引力,因为在恒定的绝热温度下,它会导致 CO 2、CO 和 NO 的排放降低。

更新日期:2021-07-30
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