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Rm,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Rm,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Rm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Rm为O.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 H_2O/CH_4 mole ratio,CH_4 inlet mass rate(Rm),inlet mixed mass flow and the micro-chamber wall temperature,the CH_4/H_2O catalytic reforming reaction characteristics with CO_2/CH_4 reaction on Ni/α-Al_2O_3 catalyst in a micro-chamber has been simulated.The results show that the difierent production characteristics of CO_2 and CO occur comparing to the other reaction mechanism for CH_4/H_2O catalytic reforming reaction.With the H_2O/CH_4 mole ratio increasing,the concentration of H_2 and CO_2 increases,but the concentration of CO increases and then decreases obviously.With increasing Rm,the CH_4/H_2O reaction process is more consummate,the reactants conversation rate and the productions mass fraction increase.At the same time,with increasing Rm,the critical H_2O/CH_4 mole ratio that the CO_2 mass fraction is bigger than CO mass fraction falls down in productions.While Rm=0.05,0.1 and 0.15,the critical H_2O/CH_4 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.
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