O2/CO2气氛下煤粉的燃烧规律与动力学特性  

Combustion Law and Kinetic Characteristics of Pulverized Coal in an O_2/CO_2 Atmosphere

作　　者：牛胜利[1] 路春美[1] 赵建立[1] 郭鲁阳[2] 刘志超[2] 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]山东电力研究院热能研究所,济南250002

出　　处：《动力工程》2008年第5期769-773,共5页Power Engineering

基　　金：山东省自然科学基金重点资助项目(Z2006F04)

摘　　要：在O2/N2及O2/CO2气氛下,利用热重法(TG)进行了3种煤粉的非等温燃烧试验.结果表明:在相同O2浓度下,不同气氛并未引起燃烧规律的变化,O2/CO2气氛可以取得O2/N2条件的燃烧效果;O2浓度在40%的范围内,随着O2浓度的提高,煤粉着火点和失重峰温度降低较为明显.此外,采用普适积分法对燃烧过程的动力学参数进行计算.结果表明:不同的反应区段存在不同的化学反应机理,但气氛的改变并未引起化学反应机理的变化,同一煤种活化能E在各个工况下的差异可由"动力学补偿效应"解释,且该计算函数适合研究已有条件下的化学反应机理.Non-isothermal combustion experiments of three types of pulverized coal were conducted by thermogravimetry （TG） in O2/N2 and O2/CO2 atmospheres. Results show that with the same O2 concentration, combustion law does not change in different atmospheres. In other words, the O2/CO2 atmosphere could get the same combustion effect as the O2/N2 atmosphere. Within the range of 40% of O2 concentration, ignition temperature and weight loss peak temperature decrease obviously with an increase of O2 concentration. Combustion kinetic parameters were calculated by universal integral means. Results indicate that different reaction zones have different chemical reaction mechanisms, and the mechanism does not change in different atmospheres. Variation of activation energy E for the same pulverized coal under different operation conditions can be explained by kinetic compensation effect, and the calculation function is fit for reaction mechanism in the planned situations.

关 键 词：能源与动力工程 燃烧学 O2/CO2 热重法 动力学特性 动力学补偿效应 

分 类 号：TQ534[化学工程—煤化学工程]