煤粉添加高炉除尘灰混合燃烧特性及动力学研究  

Combustion Characteristics and Kinetics of Blast Furnace Dust and Coal Blends

作　　者：常健[1] 苏步新[1] 张建良[1] 胡正文[1] 孔德文[1] 王广伟[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《过程工程学报》2012年第2期239-246,共8页The Chinese Journal of Process Engineering

基　　金：国家科技支撑计划项目资助项目(编号:2008BAB32B05);国家自然科学基金资助项目(编号:51174023;E0414)

摘　　要：利用热重分析天平,采用非等温燃烧方法对除尘灰与2种煤粉的混合试样的燃烧特性及其反应动力学参数进行了实验研究.考察了不同配比的混合试样的着火温度、燃烧速率最大时温度、燃尽温度和最大燃烧速率等燃烧特征参数,计算了反应的动力学参数活化能Ea和指前因子A.结果表明,两参数均随混煤中除尘灰比例的增加而降低,存在"动力学补偿效应".煤中掺入除尘灰后,试样燃烧的第一和第二阶段的Ea均呈现下降规律,但对不同煤粉影响效果程度有较大差别.Ea的计算表明,除尘灰的存在有助于改善煤的着火性能,对煤的燃烧有催化促进作用,且5%为最佳掺混比例.Combustion characteristics and kinetic parameters of blast furnace dust and coal blends using non-isothermal combustion method were studied by thermo-gravimetric balance. The combustion characteristic parameters of samples in different ratios, such as ignition temperature, peak temperature at the maximum weight loss rate, burnout temperature and the maximum combustion rate, were studied by thermo-gravimetric analysis, and the kinetic parameters such as activation energy Ea and frequency factor A were also investigated. The experimental results showed that Ea and A both decreased with increasing of blast furnace dust content in the blend, and the ＂kinetic compensation effect＂ existed in the two parameters. Ea decreased in the first and second stages of combustion of blast furnace dust and coal blends, but the influential degree changed largely for different coals. The calculation results of Ea showed that the blast furnace dust could improve the ignition property of coal, moreover there existed a synergistic effect in the combustion of blast furnace dust and coal blends, with the best property of 5% blending.

关 键 词：除尘灰 煤粉 燃烧 热重分析 动力学 

分 类 号：TF538.63[冶金工程—钢铁冶金]