微细腔内CO_2对CH_4/H_2O重整反应特性影响

NUMERICAL SIMULATION ON THE CHARACTERISTICS OF CH_4-VAPOR REFORMING REACTION OCCURRING CO_2 IN THE MICRO-CHAMBER

基于镍基催化剂下表面反应机理,采用数值模拟方法,深入研究了在一定水碳比下,CO_2含量的变化以及在固定的CH_4/H_2O/CO_2比例下催化壁面温度,质量流量对微细腔内甲烷重整反应的影响。结果表明提高CO_2/CH_4的比例能够明显提高CO_2、CH_4转化率,提高CO的含量。CH_4/CO_2基元反应的产物在低温条件下CO和H_2O,水蒸气转化率和H_2产量降低,CO_2含量增加降低水蒸气的消耗;在高温条件下,由于产生CO和H_2,使氢气含量增加但水蒸气转化率降低.

Considered Ni catalyst surface reaction mechanism,the methane reforming reaction characters were simulated in the Micro-Chamber with the different content of CO2,the different temperature of the micro chamber wall（to keep the ratio of CH4/H2O/CO2）,and the different mass flow-rate in a certain vapor/methane mole ratio.Results show that increasing the CO2/CH4 mole ratio,the CO2 and the CH4conversion ratio are ascended,and the concentration of CO is raised.For low temperature,the productions of CH4/CO2 surface elementary reaction are CO and H2O,the H2O and the H2 conversion ratio is reduced.For high temperature,the productions of CH4/CO2 surface elementary reaction are CO and H2,the H2conversion ratio is increased,but the H2O conversion ratio is dropped.