Studying the mechanisms of ignition of coal particles by TG-DTA
Studying the mechanisms of ignition of coal particles by TG-DTA
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DOI：
10.1016/0040-6031(95)02727-0
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发表时间：
1996-04-01
影响因子：
3.5
通讯作者：
Pan, WP
中科院分区：
文献类型：
--
作者：
Chen, Y;Mori, S;Pan, WP
用热重分析(TG)和差热分析(DTA)研究了无烟煤、烟煤和褐煤等不同性质煤的着火机理。在低升温速率(10Kmin~(-1))、粒度为37~4000微米的条件下进行了煤的着火实验。实验结果表明：(1)用TG-DTA测定着火温度是准确测定煤粒着火温度的一种很好的方法：(2)从褐煤到烟煤再到无烟煤，随着煤质的提高，着火类型由均相着火到非均相着火转变为非均相着火，着火温度也随之升高；(3)随着煤粒粒度的增大，开平烟煤的着火类型由非均相着火向均相着火转变，焦炭着火与挥发分着火分离并向高温方向转移，而洛阳褐煤和红艾无烟煤的着火类型均不受粒度的影响。
The mechanisms of ignition of coal of different quality, such as anthracite, bituminous coal and lignite, were studied by thermogravimetry (TG) and differential thermal analysis (DTA). Experiments on coal ignition were carried out at a low heating rate (10 K min(-1)) with particle sizes ranging from 37 to 4000 mu m.It is concluded from this experimental work that(1) ignition measurement by TG-DTA is an excellent method for accurate determination of the ignition temperature of coal particles;(2) with increasing coal quality from lignite through bituminous coal to anthracite, the type of ignition changes from homogeneous ignition through hetero-homogeneous ignition to heterogeneous ignition, and the ignition temperatures also increase;(3) with increasing coal particle size, the type of ignition of Kaipin bituminous coal changes from hetero-homogeneous to homogeneous ignition, and ignition of the char separates from that of the volatile matter and shifts to a higher temperature, whereas both types of ignition of Loy Yang lignite coal and Hongay anthracite coal are not effected by particle size.