高温烟气干燥后褐煤的自燃特性  

Self-combustion Characteristics of Lignite After Dried by High Temperature Flue Gases

作　　者：郑红俊[1] 张守玉[1] 董建勋 吕俊复[3] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]中电投蒙东能源集团有限责任公司,内蒙古通辽028000 [3]清华大学热能工程系,北京100084

出　　处：《热能动力工程》2015年第5期750-755,826,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家科技支撑计划基金资助项目(2012BAA04B01)

摘　　要：运用热重分析仪对原煤及经不同温度干燥处理的煤样进行自燃特性研究,得到了各煤样的自燃特征温度点,并依据温度点对煤样的转化过程进行了划分。最后,采用Coats-Redfern积分法对各煤样在不同阶段的动力学参数进行求解,并选取吸氧增重阶段的活化能作为自燃倾向性的指标。结果表明:整个燃烧过程可以分为失水失重、吸氧增重和燃烧失重3个阶段;高温模拟烟气干燥条件下烟气温度增加对干燥后所得煤样的吸氧增重和着火燃烧没有太大的影响;高温干燥后煤样的着火活化能升高,煤样不易自燃。By using a thermogravimetric analyzer,studied were the self-combustion characteristics of raw coal and various coal samples which had been subjected to a drying process at different temperatures and the self-ignition characteristic temperature points of various coal samples were obtained. On the basis of these temperature points,the conversion processes of the coal samples were divided. Finally,by using the Coats-Redfern integration method,the solutions to the kinetic parameters of various coal samples in different stages were sought and the activated energy in the oxygeninhaling and weight-adding stages was chosen as an index indicating a self-ignition tendency. It has been found that the whole combustion process can be divided into three stages: water losing and weight losing stage,oxygen-inhaling and weight-adding stage and combustion-caused weight-losing stage. Under the condition of the drying process by high temperature flue gases simulated,to increase the flue gas temperature has no big influence on the oxygen-inhaling and weight-adding,ignition and combustion of coal samples obtained after the drying process. The coal samples after the high temperature drying process has a higher ignition activated energy and the coal samples are not easy to perform its self-ignition.

关 键 词：褐煤干燥 自燃特性 着火活化能 热重分析 反应动力学 

分 类 号：TQ531.6[化学工程—煤化学工程]