Development of non-isothermal TGA-DSC for kinetics analysis of low temperature coal oxidation prior to ignition
Development of non-isothermal TGA-DSC for kinetics analysis of low temperature coal oxidation prior to ignition
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DOI：
10.1016/j.fuel.2013.11.011
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发表时间：
2014-02-01
期刊：
影响因子：
7.4
通讯作者：
Sheng, Changdong
中科院分区：
文献类型：
--
作者：
Li, Bo;Chen, Gang;Sheng, Changdong
本研究旨在开发一种基于热重分析和差示扫描量热法（TGA - DSC）确定低温煤氧化动力学的方法。对三种煤在单一升温速率下进行了非等温氧化的TGA - DSC分析。将测得的低温氧化放热速率和导出的表观动力学参数与篮式加热法（交叉点温度和放热法）的测试结果进行了比较。结果表明，在约100 - 150℃的温度范围内，TGA - DSC技术和篮式加热法在测量煤氧化的放热速率和动力学方面是等效的。此外，TGA - DSC方法还可以测量从约150℃到着火点温度范围内煤氧化的动力学参数，这些参数与低于约150℃温度下的参数不同。因此，此处开发的TGA - DSC方法有望作为一种具有成本效益的技术应用，用于推导低温氧化动力学，以描述着火前煤的自燃过程。（C）2013爱思唯尔有限公司。保留所有权利。
The present work was aimed at developing a method for determining the kinetics of low temperature coal oxidation based on thermogravimetric analysis and differential scanning calorimetry (TGA-DSC). The analyses of TGA-DSC on non-isothermal oxidation of three coals at a single heating rate were carried out. The measured heat release rates and derived apparent kinetic parameters of low temperature oxidation were compared with those from the tests of basket heating methods (crossing point temperature and heat release method). The results demonstrated the equivalence of the TGA-DSC technique and the basket heating methods in measuring the heat release rate and kinetics of coal oxidation in the temperature range of about 100-150 degrees C. Moreover, the TGA-DSC method can also measure the kinetic parameters of coal oxidation at the temperatures from similar to 150 degrees C to that of ignition occurring, which were shown to be different from those at the temperatures below similar to 150 degrees C. Therefore, the TGA-DSC method developed here is promising to be applied as a cost effective technique for deriving the kinetics of low temperature oxidation to describe coal spontaneous combustion process prior to ignition. (C) 2013 Elsevier Ltd. All rights reserved.