煤着火特性的热重分析研究  

Study on Ignition Properties of Coals by Using Thermogravimetry

作　　者：胡文斌[1] 杨海瑞[1] 吕俊复[1] 岳光溪[1] 张建胜[1] 

机构地区：[1]清华大学

出　　处：《电站系统工程》2005年第2期8-9,12,共3页Power System Engineering

基　　金：国家高新技术研究发展计划(863计划)项目(2002AA529050)

摘　　要：利用程序升温的热重分析法对7种不同煤样进行着火特性研究,表明由TG-DTG曲线可方便快捷地得到煤种的着火温度,并定性地判断各煤种燃烧的难易程度。分析了着火温度和挥发分、活化能等的关系,并自定义了参数R,发现R能很好地表征煤种的着火特性。将实验结果和在小型流化床上研究得到的着火特性参数比较,发现结果趋势一致,但数值偏小。理论上存在一个加热速率值,使由TGA测得的着火温度和由小型流化床上得到的着火温度一致,因此TGA实验结果可用于指导大型电站锅炉及燃烧装置的设计和运行。The ignition properties of seven kinds of coals are investigated by using thermogravimetry. From the TG-DTG curves, the ignition points of coals can be gained conveniently, which can qualitatively evaluate the difficulty of combustion of coals. The relations between the ignition properties and the volatile fraction, the ignition properties and active energy, the ignition properties and defined parameter ‘R’are analyzed. Compared with the results in the laboratory scale fluidized bed, the tendencies of the experimental results are uniform and even identical when the heating rate in TGA increases to an appropriate value. Therefore, experimental results in TGA can be considered as the reference in designing and operating of station boilers and other combustion devices.

关 键 词：着火特性 煤种 率值 着火温度 流化床 煤样 挥发分 大型电站锅炉 燃烧装置 热重分析 

分 类 号：TM621.2[电气工程—电力系统及自动化] TK229[动力工程及工程热物理—动力机械及工程]