CH_4/CO_2反应对微细腔内CH_4/H_2O镍基催化重整反应的影响  

NUMERICAL SIMULATION ON CH_4/H_2O CATALYTIC REFORMING REACTION ON Ni/α-Al_2O_3 WITH CO_2/CH_4 REACTION IN A MICRO-CHAMBER

作　　者：冉景煜[1] 牛立祥[1] 张力[1] 闫云飞[1] 

机构地区：[1]重庆大学动力工程学院,重庆400030

出　　处：《工程热物理学报》2009年第9期1517-1520,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.50876118);教育部新世纪优秀人才计划资助项目(No.NCET-08-0605)

摘　　要：本文针对微细腔内在Ni/α-Al_2O_3催化作用下,存在CH_4/CO_2反应时,数值研究了在不同的水碳比,不同的进口甲烷质量组分R_m,不同的进口流量与微细腔壁温下甲烷/水蒸气催化重整反应特性。结果发现,微细腔中存在CH_4/CO_2反应时,CH_4/H_2O催化重整反应中CO_2和CO的产生变化情况比其它反应机理下有较大的变化。随着水碳比增大,H_2和CO_2质量分数有所增大,而CO质量分数先增加后又明显地降低,并出现CO_2质量分数从小于CO质量分数变化到大于CO质量分数;增大R_m,能使反应更充分的发生,反应物的转化率,生成物的质量分数都有提高,并随着R_m的增加,生成产物中CO_2质量分数大于CO的质量分数时对应的水碳比临界值减小,在R_m为0.05、0.1、0.15时,对应的水碳比临界值分别为2.0、1.8和1.6;而混合物进口质量流量增加,反应物的转化率、生成物的产物含量都有不同程度的降低;但壁面温度的增加,反应速率有较大提高,能较明显提高反应物转化率。With the different H2O/CH4 mole ratio, CH4 inlet mass rate （Rm）, inlet mixed mass flow and the micro-chamber wall temperature, the CH4/H2O catalytic reforming reaction characteristics with CO2/CH4 reaction on Ni/α-Al2O3catalyst in a micro-chamber has been simulated. The results show that the different production characteristics of CO2 and CO occur comparing to the other reaction mechanism for CH4/H2O catalytic reforming reaction. With the H2O/CH4 mole ratio increasing, the concentration of H2 and COs increases, but the concentration of CO increases and then decreases obviously. With increasing Rm, the CH4/H2O reaction process is more consummate, the reactants conversation rate and the productions mass fraction increase. At the same time, with increasing Rm, the critical H2O/CH4mole ratio that the COs mass fraction is bigger than CO mass fraction falls down in productions. While Rm= 0.05, 0.1 and 0.15, the critical H2O/CH4 mole ratio is 2.0, 1.8 and 1.6, respectively. However, the reactants conversation rate and the productions mass fraction are descent with the increasing inlet mass flow-rate. Moreover, the conversion rate is obviously improved with enhanced micro-chamber wall temperature.

关 键 词：微细腔 CH4/CO2反应 甲烷/水蒸气反应 催化重整 

分 类 号：TK16[动力工程及工程热物理—热能工程]