流化床温度下石油焦焦炭与NO反应动力学研究  

Study on the Reaction Kinetics of Petroleum Coke Char and Nitrogen Oxide on the Temperature Rang of Fluidized Bed

作　　者：张春林[1] 张娜[1] 刘德昌[2] 

机构地区：[1]暨南大学环境工程系,广东省广州市510632 [2]华中科技大学煤燃烧国家重点实验室,湖北省武汉市430074

出　　处：《中国电机工程学报》2007年第32期13-17,共5页Proceedings of the CSEE

摘　　要：基于石油焦焦炭的物理化学特性,利用升温热重技术,研究了流化床温度条件下的NO与石油焦焦炭间的多相反应动力学特性,并考察了热解终温以及燃烧过程对该反应的影响。结果表明,在流化床温度下,焦炭对NO的还原反应活性主要由其孔隙结构决定,石油焦焦炭与NO之间多相反应属于内扩散控制。采用Coats-Redfern法分析了升温热重数据,3种不同石油焦焦炭(JMc,GHc,WHc)的动力学机理分别为1?(1?X)4,1?(1?X)3和?ln(1?X)3,活化能分别为192.17、198.33和207.7kJ·mol-1。热解终温的变化对焦样的活性基本没有影响,而反应活性随燃烧的进行有所改善。Based on the physical and chemical characteristics of petroleum coke char, the global kinetics of the heterogeneous reaction between petroleum coke chars and NO on the temperature range of fluidized bed were studied on with programmed-temperature thermogravimetric method. The effects of pyrolysis temperature and combustion processes on the reaction were also investigated. The results show that the reactivity of petroleum char to NO mostly depends on the pore structure, and the reaction is governed by the internal diffusion in the pore of petroleum coke char. According to the results of Coats-Redfern method, The heterogeneous reaction mechanism of JM char, GH char and WH char can be described by 1-（1-X）^4, 1-（1-X）^3 and -ln（1-X）^3, and the activation energy are 192.17,198.33 and 207.7 kJ/mol, respectively. Further more, the pyrolysis temperature has no influence on the reactivity of the chars, and the reactivity of char improves with the burn-out ratio.

关 键 词：一氧化氮 石油焦 反应动力学 升温热重 孔结构参数 

分 类 号：TK16[动力工程及工程热物理—热能工程]