含湿量对甲烷湿空气自热重整积碳特性的影响

NUMERICAL SIMULATION ON CARBON DEPOSITION CHARACTERISTICS OF HUMIDITY RATIO ON CH_4/WET AIR AUTO-THERMAL REFORMING REACTION

微动力装置中碳氢燃料催化燃烧被认为是有效的方法,但燃烧室内燃料催化重整普遍存在由积碳导致的催化剂失活等问题。本文采用数值方法研究了微细腔中甲烷湿空气在镍基催化剂上的自热重整反应,重点分析含湿量对甲烷自热重整反应及积碳特性的影响。结果表明:含湿量将增强甲烷重整反应;自热反应散热量和表面积碳浓度均随含湿量增加而降低。混合物质量流量为36 g/h时,当含湿量d>1.20 kg/kg后,甲烷转化率、氢气质量分数和积碳浓度变化幅度很小,分别接近53.1%、3.07%和2.40×10^(-6) kmol/m^2。

Catalytic combustion of hydrocarbon fuels has been considered as an effective method in power MEMS. However, the catalyst deactivation, mainly caused by carbon deposition, is occurred ubiquity in the catalytic reforming progress. In this paper, the effects of humidity ratio on the CH4/wet air auto-thermal reforming reaction with Ni catalyst on the micro-chamber＇s surface were simulated. The results show that increasing the humidity ratio will promote the methane reforming reaction. The heat dissipating capacity of auto-thermal reforming and the density of carbon deposition reduce with increasing the humidity ratio. The CH4 conversion rate, density of carbon deposition and mass fraction of H2 were changed very little, they reach 53.1%, 3.07% and 2.40×10^-6 kmol/m^2 respectively while the humidity ratio exceeds 1.20 kg/kg and mixture flow rate is 36 g/h.