Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

被引:7
作者
Guo, Jiangbo [1 ,2 ]
Zhang, Tianjun [1 ,2 ]
Pan, Hongyu [1 ,2 ]
机构
[1] Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian 710054, Peoples R China
[2] Hazard Prevent Minist Educ, Key Lab Western Mine Exploitat, Xian 710054, Peoples R China
基金
中国国家自然科学基金;
关键词
LOW-TEMPERATURE; OXIDATION; DECOMPOSITION; BEHAVIOR;
D O I
10.1021/acsomega.2c07281
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
To investigate the effect of preoxidation on the secondary spontaneous combustion of coal, the changes in the key groups and thermal characteristic parameters in coal after preoxidation were investigated through Fourier transform infrared spectroscopy (FTIR), laser thermal conductivity, and thermogravimetric experiments. Results showed that the aromatic hydrocarbons in coal gradually decrease with the rise in the preoxidation temperature, the aliphatic hydrocarbons increase and then decrease, the -C-O- group gradually decreases, and the -C=O and -COO- group content slowly increases. Preoxidation promotes the breakdown of aromatic hydrocarbons and the oxidation of oxygen-containing functional groups in coal. Meanwhile, the thermal diffusivity of coal decreases after preoxidation, while the specific heat capacity and thermal conductivity increase and then decrease. The results of the thermogravimetric analysis indicate that preoxidation changes the characteristic temperature, but it does not change the process of spontaneous combustion. The spontaneous combustion process of raw and preoxidized coals can be divided into three stages: water evaporation, oxygen adsorption, and combustion. Further, the apparent activation energy increases and then decreases with a rise in the preoxidation temperature during the moisture evaporation stage, increases during the oxygen adsorption stage, and decreases during the combustion stage.
引用
收藏
页码:4176 / 4186
页数:11
相关论文
共 48 条
[1]   INFLUENCE OF COAL OXIDATION UPON CHAR GASIFICATION REACTIVITY [J].
ALVAREZ, T ;
FUERTES, AB ;
PIS, JJ ;
EHRBURGER, P .
FUEL, 1995, 74 (05) :729-735
[2]  
BP, 2021, Statistical Review of World Energy
[3]   Comparison of structural characteristics of high-organic-sulfur and low-organic-sulfur coal of various ranks based on FTIR and Raman spectroscopy [J].
Chen, Cong ;
Tang, Yuegang ;
Guo, Xin .
FUEL, 2022, 310
[4]   Kinetic Modeling of Coal Thermal Decomposition under Air Atmosphere [J].
Chen, Peng ;
Zhang, Lang ;
Huang, Kai .
ENERGY & FUELS, 2016, 30 (06) :5158-5166
[5]   Using inverting CO critical value to predict coal spontaneous combustion severity in mine gobs with considering air leakages - A case study [J].
Cheng, Jianwei ;
Ma, Yongzhen ;
Lu, Weidong ;
Liu, Guozhong ;
Cai, Feng .
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, 2022, 167 :45-55
[6]   A novel composite inorganic retarding gel for preventing coal spontaneous combustion [J].
Cheng, Jianwei ;
Wu, Yuhang ;
Dong, Ziwen ;
Zhang, Rui ;
Wang, Wenbin ;
Wei, Guoying ;
Chu, Tingxiang ;
Yu, Zhaoyang ;
Qin, Yi ;
Liu, Guozhong ;
Li, Haijian .
CASE STUDIES IN THERMAL ENGINEERING, 2021, 28
[7]   Thermal properties of coals with different metamorphic levels in air atmosphere [J].
Deng, Jun ;
Ren, Shuai-Jing ;
Xiao, Yang ;
Li, Qing-Wei ;
Shu, Chi-Min .
APPLIED THERMAL ENGINEERING, 2018, 143 :542-549
[8]   Inhibiting effects of three commercial inhibitors in spontaneous coal combustion [J].
Deng, Jun ;
Yang, Yi ;
Zhang, Yan-Ni ;
Liu, Bo ;
Shu, Chi-Min .
ENERGY, 2018, 160 :1174-1185
[9]   Thermal analysis of spontaneous combustion behavior of partially oxidized coal [J].
Deng, Jun ;
Zhao, Jingyu ;
Zhang, Yanni ;
Huang, Anchi ;
Liu, Xiangrong ;
Zhai, Xiaowei ;
Wang, Caiping .
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, 2016, 104 :218-224
[10]   Thermal decomposition kinetics of sorghum straw via thermogravimetric analysis [J].
Dhyani, Vaibhav ;
Kumar, Jitendra ;
Bhaskar, Thallada .
BIORESOURCE TECHNOLOGY, 2017, 245 :1122-1129