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

作　　者：冉景煜[1,2] 涂维峰[1,2] 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆400030 [2]重庆大学动力工程学院,重庆400030

出　　处：《工程热物理学报》2011年第2期345-348,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目资助(No.50876118);教育部新世纪优秀人才计划资助(No.NCET-08-0605);中央高校基本科研业务费资助(No.CDJXS11142231);重庆大学211工程"三期建设"项目(No.S-09101)

摘　　要：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.

关 键 词：微细腔 甲烷湿空气 自热重整 积碳 含湿量 

分 类 号：TK16[动力工程及工程热物理—热能工程]