天然矿物添加剂对高炉喷吹煤粉燃烧特性的影响  

Effects of natural minerals on the combustion characteristics of pulverized coal

作　　者：孔德文[1] 张建良[1] 林祥海[1] 龚必侠[2] 苏步新[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]中冶京诚工程技术有限公司,北京100176

出　　处：《北京科技大学学报》2011年第9期1160-1165,共6页Journal of University of Science and Technology Beijing

基　　金：国家科技支撑计划资助项目(2008BAB32B05)

摘　　要：利用热分析法研究了大贵白云石、荣富镁石、东燃镁石、里领石灰石和方解石五种天然矿物添加剂对无烟煤燃烧过程的影响.考察了着火温度、最大燃烧速率、挥发分释放特性指数和燃尽特征指数等燃烧特征参数,求出了反应动力学参数活化能Ea和指前因子A.实验结果表明:大贵白云石、荣富镁石和东燃镁石能够显著促进煤粉的燃烧过程,降低着火温度,增大煤粉的挥发分释放特征指数D和煤粉的燃尽特性指数Cb,使最大燃烧速率前移至挥发分着火燃烧阶段;里领石灰石和方解石则相反.同时,动力学计算表明:大贵白云石、荣富镁石和东燃镁石使煤粉的活化能分别降低10.4%、14.5%和10.7%,对煤粉燃烧有助燃作用;里领石灰石和方解石使煤粉的活化能分别提高2.0%和4.3%,对煤粉燃烧没有助燃作用.The effects of five natural-mineral additives on the combustion characteristics of anthracite were investigated with a synthetical thermal analyzer. The five natural-mineral additives are DG-dolomite, RF-humite, DR-humite, LL-limestone and calcite. Combustion characteristic parameters such as ignition temperature, maximum combustion rate, release property index and burn-out characteristic index were studied by thermo-gravimetric analysis, and the kinetics parameters of samples such as activation energy and frequency factor were also calculated. Experimental results show that DG-dolomite, RF-humite and DR-humite can promote the combustion of anthracite, decrease the ignition temperature, increase the release property index and burn-out characteristic index, and make the maximum rate of combustion move ahead the volatile matter combustion contemporaneously; nevertheless, LL-limestone and calcite have the opposite effect. Kinetics calculation results reveal that the addition of DG-dolomite, RF-humite and DR-humite decreases the activation energy by 10.4% , 14.5% and 10.7% respectively, and the decrease has a combustion-supporting effect in the combustion of blends. Adding LL-limestone and calcite increases the activation energy by 2.0% and 4.3% respectively, and the increase exhibits a fire-retardant effect in the combustion of blends.

关 键 词：高炉 煤燃烧 添加剂 燃烧特性 热重分析 动力学 

分 类 号：TF538.63[冶金工程—钢铁冶金]