Investigation on the ignition, thermal acceleration and characteristic temperatures of coal char combustion
Investigation on the ignition, thermal acceleration and characteristic temperatures of coal char combustion
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煤焦燃烧着火、热加速及特征温度研究
DOI：
10.1016/j.applthermaleng.2016.11.103
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发表时间：
2017-02
影响因子：
6.4
通讯作者：
Zheng Chuguang
中科院分区：
文献类型：
--
作者：
Zhang Bin;Fu Peifang;Liu Yang;Yue Fang;Chen Jing;Zhou Huaichun;Zheng Chuguang
采用一种新的热分析模型和煤/半焦燃烧方法，通过同时进行热重和差示扫描量热法(TG-DSC)实验，测定了三种不同煤焦的最低着火温度和最低着火热。结果表明，煤焦的着火发生在最低着火温度和拐点温度之间。热加速度及其梯度GT随升温速率的增加而增大，随煤焦等级的增加而减小。煤焦的GT越高，越容易着火，燃烧和燃尽越快。结果表明，在着火区，SLH褐煤的GT是ZCY烟煤和JWY无烟煤的1.6倍，在燃烧区是JWY无烟煤的3.4倍。特征温度随炭化温度、升温速度和炭阶的增加而升高。此外，DSC实验计算的最大着火温度Tig与气流床内的着火温度基本一致，证明了该理论的可行性。
Through using a new thermal analysis model and a method of coal/char combustion, the minimum ignition temperature and minimum ignition heat of three different ranks of pulverized coal char were measured by simultaneous Thermogravimetry and Differential Scanning Calorimetry (TG-DSC) experiments. The results show that the ignition of coal char occurs in the range between the minimum ignition temperature and the inflection-point temperature. The thermal acceleration and its gradientGTincrease with increasing heating rate and decrease with increasing coal char rank. The higher theGTof the coal char, the more easily the ignition occurs and more rapidly the burning and burnout occur. The data show that theGTof coal char of SLH lignite is 1.6 times more than that of coal char of ZCY bituminous and JWY anthracite in ignition zone, and 3.4 times in burning zone. The characteristic temperatures increase with increasing temperature of prepared char, heating rate and char rank. Moreover, theTig,maxcalculated in DSC experiment is approximately in line with the ignition temperature obtained in the entrained flow reactor, which demonstrates the feasibility of the proposed theory.
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