焦炭体系下添加剂对CO_2重整CH_4特性的影响  

Influence of Additives on Carbon Dioxide Reforming of Methane in Coal Char System

作　　者：金保升[1] 李延兵[1] 肖睿[1] 张会岩[1] 王芳[1] 

机构地区：[1]东南大学洁净煤发电及燃烧技术教育部重点实验室,南京210096

出　　处：《动力工程》2008年第5期764-768,共5页Power Engineering

基　　金：国家973计划资助项目(2005CB221202-03);国家863计划资助项目(2006AA020101);江苏省创新计划资助项目;东南大学校优秀博士论文资助项目

摘　　要：利用固定床试验装置,以SiO2、MgO和CaO为添加剂,在焦炭体系下进行了CO2重整CH4活性的试验研究,并分析了反应温度和CaO含量对重整反应的影响.利用热重分析仪和扫描电镜分别对重整过程中焦炭失重和反应后焦炭微观形貌进行研究,探讨了反应机理.结果表明：加入SiO2后,制得的焦炭催化活性降低,加入CaO和MgO后,制得的焦炭催化活性提高,且CaO优于MgO;温度对重整反应影响显著,随着温度升高,反应气转化率增加;CaO添加剂含量控制在15%-20%之间对反应速率的提高较合适,且CaO的添加使焦炭失重速率也有所提高.A fixed bed reactor was applied to study carbon dioxide reforming of methane in coal char system, using SiO2, MgO and CaO as additives. Effects of operation temperature and CaO content on the reforming reaction were analyzed. Char samples weight loss in reforming and microscopic feature of char samples after reaction were characterized by the thermo-gravimetric analyzer and SEM analyzer, respectively. Reaction mechanism was discussed. Results show that catalytic activity of char decreases with additive of SiO2, while increases with MgO and CaO. Moreover, Effect of CaO is better than that of MgO. Temperature has an obvious influence on reforming reaction and conversion rates of CH4 and CO2 increase with temperature rising. The optimal content of CaO for reaction rate increasing is 15%-20%. Weight loss rate of char samples also increases in the presence of CaO.

关 键 词：能源与动力工程 重整 固定床 热重 添加剂 CO2 

分 类 号：TQ013.1[化学工程]