组分变化对甲烷氧化特性影响

在射流搅拌反应器实验平台上针对温度范围850~1 300 K、常压条件下的甲烷氧化反应过程进行了实验研究,采用气相色谱仪测量了变组分条件下(当量比范围02~2、氧气体积分数2%~8%、二氧化碳体积分数0~20%、水蒸气体积分数0~20%)主要反应物(CH4、O2)、主要中间组分(C2H6、C2H4、C2H2、H2)和主要污染物(CO、CO2)的摩尔分数,并分析了主要反应物、中间组分以及污染物生成的影响因素和影响规律。研究表明,随着当量比和含氧量的增加,主要中间组分的摩尔分数升高;二氧化碳体积分数的增加对中间产物的生成有微弱的抑制作用,却使得污染物浓度大大增加;水蒸气体积分数的增加导致氢气生成量显著增加,同时促进一氧化碳的生成,而对二氧化碳的生成影响很小。 

Effect of composition variance on methane oxidation characteristics

The methane oxidation within the temperature range of 850-1 300 K and atmospheric pressure was studied in a jet stirred reactor. The major reactants (CH4, O2), intermediate components (C2H6, C2H4, C2H2, H) and pollutants (CO, CO2) were measured by gas chromatography under the condition of equivalence ratio range of 02-2, oxygen content of 2%-8%, carbon dioxide content of 0-20%, water vapor content of 0-20%. The effects of various compositions on species distributions during methane oxidation were analyzed in detail. It was found that the concentration of intermediate components increased with the increase of equivalence ratio and oxygen content; the increase of carbon dioxide content had a weak inhibitory effect on the formation of intermediate products, but resulted in obvious rise of the concentration of pollutants; the increase of water vapor content led to significant increase of hydrogen production, and promoted the formation of carbon monoxide, but had little effect on the formation of carbon dioxide.