富氧气氛下煤粉燃烧及动力学特性的实验研究  

STUDY ON COMBUSTION AND KINETIC CHARACTERISTICS OF PULVERIZED COAL IN OXYGEN-ENRICHED ENVIRONMENTS

作　　者：唐强[1] 王丽朋[1] 闫云飞[1] 

机构地区：[1]重庆大学动力工程学院,重庆副教授400030

出　　处：《煤炭转化》2009年第3期55-59,共5页Coal Conversion

基　　金：重庆市重大科技攻关项目(CSTC2008AC2051)

摘　　要：采用综合热分析仪研究了两种煤粉在三种不同粒径范围下氧浓度对其燃烧特性参数的影响,并计算得到各工况下的动力学参数.结果表明,随着氧浓度增加,燃烧DTG曲线向低温区移动,着火及燃尽温度降低,燃尽时间缩短,综合燃烧指数明显提高,燃烧特性得到改善,尤其对粒径较大的煤粉改善更为明显;煤粉燃烧反应低温段的反应活化能和频率因子比高温段低,反应级数较小;不同氧浓度下,煤粉燃烧活化能和频率因子间存在动力学补偿效应.Non-isothermal combustion experiments of two types of pulverized coal with three different particle size were conducted by synthesized thermogravimetry analyzer in different oxygen concentration. The changes of combustion characteristic parameters of pulverized coals in different atmospheres are analyzed and the kinetic parameters of every condition are calculated. The results show that DTG curves of coal combustion move to low temperature zones when 02 concentration increases. It indicates that both ignition and burnout temperature are lower, burn- out time decreases, combustion characteristic index obviously increases, and combustion perform- ance of pulverized coals are improved, especially for the larger particle size of pulverized coal. Activation energy, frequency factor and reaction order of low-temperature stage are lower than that of high-temperature stage. Kinetic compensation relationship exists between combustion activation energy and frequency factor in different atmospheres.

关 键 词：富氧燃烧 热重法 燃烧特性 动力学 补偿效应 

分 类 号：TQ534[化学工程—煤化学工程]