温度和催化剂对木屑炭二氧化碳气化的影响(英文)  

Effects of Temperature and Catalysts on CO_2 Gasification of Sawdust Charcoal

作　　者：王燕杰[1,2,3,4] 应浩[1,2,3,4] 余维金 孙康[1,2,3,4] 

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《生物质化学工程》2014年第3期11-18,共8页Biomass Chemical Engineering

基　　金：“十二五”国家科技支撑计划资助(2012BAD30B0204)

摘　　要：通过热重分析仪和管式反应炉研究了温度和催化剂对木屑炭二氧化碳气化的影响。结果表明,提高反应温度有利于加快气化反应速率,增加CO产率及产气热值,同时有助于降低CO2及固体剩余物的含量,温度从850℃升至1 000℃,燃气中CO含量从28.86%增加到54.45%,热值从4.50 MJ/m3增加到7.95 MJ/m3,而CO2含量从64.34%减少到36.54%;2 g木屑炭气化后,固体产物从1.32 g减少到0.79 g。研究发现,催化剂CaCO3和K2CO3对木屑炭二氧化碳气化有促进作用,其作用效果与升温相同,K2CO3对气化反应的促进作用明显强于CaCO3。利用混合反应模型对添加催化剂前后的木屑炭二氧化碳气化动力学进行了研究,发现该模型适用于木屑炭二氧化碳气化反应,而且催化剂的添加有利于降低反应活化能和指前因子,木屑炭、添加CaCO3的木屑炭和添加K2CO3的木屑炭的活化能分别是94.509、81.740和50.271 kJ/mol;指前因子分别是1 208.428、428.825和19.965 min-1。The effects of temperature（ 850,900,950,1 000 ℃） and catalysts（ CaCO3 and K2CO3） on CO2 gasification of sawdust charcoal were investigated using thermal gravimetric analyzer and tubular reactor.Higher temperature had stimulative effect on the reactivity of sawdust charcoal reacting with CO2.With the increase of temperature from 850 ℃ to 1 000 ℃,the CO content of gaseous product increased from 28.86 % to 54.45 %,and the heating value rised from 4.50 MJ /m3to 7.95 MJ /m3.Meanwhile,the CO2 content decreased from 64.34 % to 36.54 %.With the sawdust charcoal sample of 2 g after gasification,the solid product decreased from 1.32 g to 0.79 g.The catalysts also had positive effects on CO2 gasification of sawdust charcoal that the CO content and heating value of gaseous product and reactivity were enhanced.And the CO2 content in gaseous product and solid product were decreased by the addition of CaCO3 and K2CO3.However,the catalytic effect of K2CO3 was more effective than that of CaCO3.The hybrid reaction model was applied to investigate the kinetics of sawdust charcoal CO2 gasification with different catalysts in this literature and the temperature range was 850-1 000 ℃.With the addition of CaCO3 and K2CO3,the activation energy and pre-exponential factor were lowered,the activation energy of charcoal without catalyst,charcoal with CaCO3 and charcoal with K2CO3 were 94.509,81.740,50.271 kJ /mol,and the pre-exponential factor were 1 208.428,428.825,19.965 min- 1,respectively.

关 键 词：木屑炭 二氧化碳气化 温度 催化剂 动力学 

分 类 号：TQ351.21[化学工程]