非等温动力学研究煤的着火特性  

NON-ISOTHERMAL KINETIC ANALYSIS OF LGNITION PROPERTIES OF COALS

作　　者：解凤霞[1] 张丹[1] 张欣欣[1] 

机构地区：[1]西安工程大学环境与化学工程学院,西安博士副教授710048

出　　处：《煤炭转化》2012年第2期61-65,共5页Coal Conversion

摘　　要：以乌煤和自洗蒙古煤为原料,采用TG-DTG法,应用非等温动力学方法研究了升温速率和粒径对煤着火特性的影响,并得出两种煤燃烧过程的动力学参数.根据煤燃烧产物释放特性指数R的大小来确定煤的燃烧性能.在实验条件下得出以下结论:1)乌煤在升温速率较低时,挥发分释放特性指数R值大,燃烧特性好,对煤着火有利;而升温速率对自洗蒙古煤的燃烧性能影响不大;2)乌煤:粒径0.2mm～0.3mm失重量最大,粒径小于0.15mm和0.15mm～0.2mm失重量基本一致.自洗蒙古煤:粒径0.2 mm～0.3 mm失重量最小,粒径小于0.15 mm失重量和0.15mm～0.2mm失重量基本一致;3)通过对两种煤燃烧过程的动力学分析,得出乌煤燃烧过程的活化能高于自洗蒙古煤.The ignition properties of Zixi Mongolia coal and Wu coal were investigated using the thermogravimetry technique （TG-DTG）. The influence of ignition propertyes in different heating rate and different particle size were discussed. Kinetic parameters of coal combustion process were obtained. According to the index R of the release of combustion products of coal, the ignition properties of coal was determined. Under the experimental conditions the following conclusions were obtained： 1） the heating rate is lower, the index R of the release of combustion products is larger. So the lower heating rate is beneficial to the ignition. But the heating rate has little effect on the ignition properties of Zixi Mongolia coal; 2） the same rate of temperature conditions, the Wu coal： 0. 2 mm-0. 3 mm weightlessness is the largest, less than 0. 15 mm and 0. 15 mm-0.2 mm basic consistently; since the burning of Zixi Mongolia coal： 0.2 mm-0. 3 mm weightlessness minimum, less than 0. 15 mm weightlessness and 0.15 mm-0.2 mm weightlessness are basically the same; 3） through two kinds of coal combustion process for the dynamic analysis of the Wu coal combustion process that the activation energy of higher than the Zixi Mongolia coal.

关 键 词：升温速率 粒径 着火特性 动力学 

分 类 号：TQ534[化学工程—煤化学工程]