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Thermodynamic analysis of tri-reforming of oxy-fuel combustion exhaust gas
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.jcou.2020.101156
Onochie Okonkwo , Gregory Yablonsky , Pratim Biswas

A thermodynamic equilibrium analysis of the tri-reforming of oxy-combustion exhaust gases based on the minimisation of the Gibbs energy, was performed. To capture the effect of air leakage into the oxy-combustion boiler, two cases were investigated, representing 10 % and 1% combustion air leakage. The effects of temperature, pressure, and the ratio of methane to carbon dioxide (CH4/CO2) on the tri-reforming of the exhaust gases was studied. The domain of the practical operating regime for the tri-reforming of exhaust gases which is circumscribed by the maximum operating temperature, minimum CO2 conversion and zero-coke equilibrium was identified. In addition, three reactions (steam reforming, dry reforming and reverse water gas shift) were identified to be dominating in the temperature domain above the zero-coke equilibrium temperature. Within the boundaries of the practical operating regime, the tri-reforming of coal oxy-combustion exhaust gas results in more than three times the net conversion of CO2/kg CH4, when compared to the tri-reforming of conventional coal combustion exhaust gas.



中文翻译:

富氧燃烧废气三重整的热力学分析

基于吉布斯能量的最小化,对氧燃烧废气的三重整进行了热力学平衡分析。为了捕获漏气进入氧气燃烧锅炉的影响,调查了两种情况,分别为10%和1%的燃烧漏气。研究了温度,压力以及甲烷与二氧化碳的比例(CH 4 / CO 2)对废气三重转化的影响。废气三重整的实际运行方式范围由最高运行温度,最低CO 2限制确定了转化率和零焦平衡。另外,确定了在零焦平衡温度以上的温度域中占主导地位的三个反应(蒸汽重整,干重整和水煤气变换)。在实际操作方案的范围内,与常规煤燃烧废气的三重转化相比,煤氧燃烧废气的三重转化产生的CO 2 / kg CH 4净转化率超过三倍。。

更新日期:2020-04-02
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