甲烷三重整制合成气热力学分析

甲烷三重整反应(TRM,Tri-reforming of methane)具有过程能效高、合成气H2/CO适宜和较低催化剂积炭的优点。采用平衡常数法对TRM反应制合成气进行了热力学分析,研究了反应温度、压力及反应原料进气组分对重整特性的影响。结果表明:温度在1073K以上时TRM反应表现出很好的效果,温度升高有利于转化率的提高;但是压力的升高不利于反应正向进行。氧气含量增加,将使甲烷和二氧化碳转化率分别升至95%以上和降至10%以下,但是H2/CO值维持在1.5附近;水蒸气和二氧化碳含量增加,甲烷转化率升高,二氧化碳转化率降低,而且H2/CO值在1.4～2.1之间变化,前者使之升高,后者使之降低。

Thermodynamic Analysis of the Preparation of Syngas Through a Triple-reforming of Methane

TRM(triple-reforming of methane) reaction boasts such merits as a high process energy efficiency,a proper syngas H2/CO and relatively low carbon deposition of catalysts.A thermodynamic analysis was performed of the preparation of syngas through a triple-reforming of methane by using the equilibrium constant method with the influence of the reaction temperature,pressure and composition of the feed gas on the reforming characteristics being studied.The research results show that when the TRM reaction temperature is above 1073 K,the reaction achieves a very good effectiveness and the temperature rise is conducive to an enhancement of the conversion rate.However,an increase of the pressure is unfavorable to a positive reaction.An increase of the oxygen content will make the conversion rates of methane and carbon dioxide go up to above 95% and down to below 10% respectively while the H2/CO value will maintain around 1.5.When the steam and carbon dioxide content increase,the conversion rate of methane will increase but that of the carbon dioxide will decrease with the H2/CO value changing in a range from 1.4 to 2.1.The former will make the H2/CO value increase while the latter will make it decrease.