Variation of macro and microscopic characteristic parameters and kinetics of secondary oxidation of residual coal

LIANG Wenxu; HU Zhiwei; BIAN Xiaofeng; YANG Wenzheng; WANG Zhe

Safety in Coal Mines > 2023 > 54(3): 109-116.

LIANG Wenxu, HU Zhiwei, BIAN Xiaofeng, YANG Wenzheng, WANG Zhe. Variation of macro and microscopic characteristic parameters and kinetics of secondary oxidation of residual coal[J]. Safety in Coal Mines, 2023, 54(3): 109-116.

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Variation of macro and microscopic characteristic parameters and kinetics of secondary oxidation of residual coal

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Published Date: March 19, 2023

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Abstract

In order to investigate the spontaneous combustion characteristics of secondary oxidation of residual coal in the mining area, the changes of microscopic and macroscopic parameters during the secondary oxidation of raw and oxidized coals were compared using tests such as infrared spectroscopy and simultaneous thermal analyzer, and the kinetic parameters of secondary oxidation were calculated. The results show that the content of substituted benzene, -C=C-, -CH3, -CH2-, -CH3/-CH2-, -C=O and -COOH groups in the oxidized coal increases, while -CH, -OH and free radical concentrations, g-factor and line width decrease significantly. Compared to raw coal, the secondary oxidation of residual coal has a smaller characteristic temperature and heat absorption and a larger heat release, mass loss rate and overall combustion coefficient. The combustion processes of both raw and oxidized coals are consistent with primary reactions, but oxidized coal has a lower activation energy. On balance, oxidized coal has a greater propensity for spontaneous combustion and a greater risk of spontaneous combustion.
- secondary oxidation,
- FTIR,
- free radicals,
- thermogravimetry,
- differential scanning calorimetry,
- kinetics parameters

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[1]	REN Xiaofeng, HU Xiangming, XUE Di, et al. Novel sodium silicate/polymer composite gels for the prevention of spontaneous combustion of coal[J]. Journal of Hazardous Materials, 2019, 371: 643-654.
[2]	中国煤炭工业协会. 2021煤炭行业发展年度报告[R]. 北京：中国煤炭工业协会，2022.
[3]	董凯丽，王俊峰，梁择文，等．矿用CMC/ZrCit/GDL防灭火凝胶特性研究[J]．中国安全科学学报，2020，30（1）：114－120. DONG Kaili, WANG Junfeng, LIANG Zewen, et al. Characteristics of CMC/ZrCit/GDL fire extinguishing gel used for mines[J]. China Safety Science Journal, 2020, 30（1）: 114-120.
[4]	王福生，高湛翔，高东．基于差减图谱分析的煤低温氧化活性基团转化规律[J]．煤矿安全，2022，53（3）：43 －49. WANG Fusheng, GAO Zhanxiang, GAO Dong. Transformation law of coal low-temperature oxidation active groups based on subtraction map[J]. Safety in Coal Mines, 2022, 53（3）: 43-49.
[5]	梁运涛，侯贤军，罗海珠，等．我国煤矿火灾防治现状及发展对策[J]．煤炭科学技术，2016，44（6）：1－6. LIANG Yuntao, HOU Xianjun, LUO Haizhu, et al. Development countermeasures and current situation of coal mine fire prevention & extinguishing in China[J]. Coal Science and Technology, 2016, 44（6）: 1-6.
[6]	陈晓坤，王晨熹，翟小伟．基于热爆炸理论的煤燃点确定及动力学分析[J]．中国安全科学学报，2022，32（2）：59－65. CHEN Xiaokun, WANG Chenxi, ZHAI Xiaowei. Determination and kinetics analysis of coal ignition point based on thermal explosion method[J]. China Safety Science Journal, 2022, 32 （2）: 59-65.
[7]	张洋，吴兵，李滕滕，等．二次氧化煤燃烧和灭火过程的实验研究[J]．矿业科学学报，2020，5（3）：272－277. ZHANG Yang, WU Bing, LI Tengteng, et al. Experimental study on combustion and extinguishing of secondary oxidation coal[J]. Journal of Mining Science and Technology, 2020, 5（3）: 272-277.
[8]	邓军，赵婧昱，张嬿妮，等．低变质程度煤二次氧化自燃特性试验[J]．煤炭科学技术，2016，44（3）：49－54. DENG Jun, ZHAO Jingyu, ZHANG Yanni, et al. Experiment on secondary oxidation spontaneous combustion characteristics of low metamorphic degree coal[J]. Coal Science and Technology, 2016, 44（3）: 49-54.
[9]	XU Qin, YANG Shengqiang, YANG Wenming, et al. Secondary oxidation of crushed coal based on free radicals and active groups[J]. Fuel, 2021, 290: 120051.
[10]	王君宇，王俊峰，唐一博．褐煤二次氧化特性与临界温度范围实验研究[J]．煤矿安全，2018，49（11）：29 －32. WANG Junyu, WANG Junfeng, TANG Yibo. Experimental study on secondary oxidation characteristics and critical temperature range of brown coal[J]. Safety in Coal Mines, 2018, 49（11）: 29-32.
[11]	肖旸，叶星星，刘昆华，等．二次氧化煤自燃过程关键官能团的转变规律[J]．煤炭学报，2021，46（Ｓ2）：989－1000. XIAO Yang, YE Xingxing, LIU Kunhua, et al. Transformation law of key functional groups in the process of coal secondary oxidation[J]. Journal of China Coal Society, 2021, 46（S2）: 989-1000.
[12]	杨锴，杨胜强，许芹．不同粒径原煤、初次氧化煤与二次氧化煤氧化特性对比分析[J]．河南理工大学学报（自然科学版），2022，41（1）：17－22. YANG Kai, YANG Shengqiang, XU Qin. Comparative analysis of oxidation characteristics of raw coal, primary oxidized coal and secondary oxidized coal with different particle sizes[J]. Journal of Henan Polytechnic University（ＮａｔｕｒａｌＳｃｉｅｎｃｅ）, 2022, 41（1）: 17-22.
[13]	文虎，陆彦博，刘文永．水浸煤二次氧化自燃危险性实验研究[J]．矿业安全与环保，2020，47（3）：6－11. WEN Hu, LU Yanbo, LIU Wenyong. Experimental study on the risk of secondary oxidation spontaneous combustion of water immersed coal[J]. Mining Safety & Environmental Protection, 2020, 47（3）: 6-11
[14]	张辛亥，卢苗苗，白亚娥，等．基于热重红外联用的煤二次氧化自燃特性研究[J]．矿业安全与环保，2018， 45（5）：16－21. ZHANG Xinhai, LU Miaomiao, BAI Yae, et al. Study on spontaneous combustion characteristics of coal secondary oxidation based on TG-FTIR[J]. Mining Safety & Environmental Protection, 2018, 45（5）: 16-21.
[15]	王凯，和运中，尚博．预氧化对煤复燃极限参数影响的实验研究[J]．煤矿安全，2020，51（7）：31－35. WANG Kai, HE Yunzhong, SHANG Bo. Experimental study of pre-oxidation effect on limit parameters of coal secondary spontaneous combustion[J]. Safety in Coal Mines, 2020, 51（7）: 31-35.
[16]	TANG Yibo, XUE Sheng. Laboratory study on the spontaneous combustion propensity of lignite undergone heating treatment at low temperature in inert and low-oxygen environments[J]. Energy & Fuels, 2015, 29（8）: 4683-4689.
[17]	任帅京，肖旸，赵帅，等．遗煤二次氧化过程中不同阶段自燃特性[J]．湖南科技大学学报（自然科学版），2018，33（3）：16－21. REN Shuaijing, XIAO Yang, ZHAO Shuai, et al. Study on the forsaken coal spontaneous combustion characteristics in different stages during secondary oxidation process[J]. Journal of Hunan University of Science & Technology（ＮａｔｕｒａｌＳｃｉｅｎｃｅＥｄｉｔｉｏｎ）, 2018, 33（3）: 16-21.
[18]	邓军，赵婧昱，张嬿妮，等．不同变质程度煤二次氧化自燃的微观特性试验[J]．煤炭学报，2016，41（5）：1164－1172. DENG Jun, ZHAO Jingyu, ZHANG Yanni, et al. Micro-characteristics of spontaneous combustion of second oxidation with different rank coals[J]. Journal of China Coal Society, 2016, 41（5）: 1164-1172.
[19]	张玉涛，杨杰，李亚清，等．煤自燃特征温度与微观结构变化及关联性分析[J/OL].煤炭科学技术：1－8[2022-10-31].DOI: 10.13199/j.cnki.cst.2021-0907. ZHANG Yutao, YANG Jie, LI Yaqing, et al. Correlation analysis between characteristic temperature and microstructure of coal spontaneous combustion[J/OL].Coal Science and Technology: 1-8[2022-10-31]. DOI: 10.13199/j.cnki.cst.2021-0907.
[20]	YI Baojun, ZHANG Liqi, HUANG Fang, et al. Effect of H2O on the combustion characteristics of pulverized coal in O2/CO2 atmosphere[J]. Applied Energy, 2014, 132: 349-357.
[21]	王秋红，马超，刘著，等．3种烟煤燃烧动力学特性对比分析[J]．西安科技大学学报，2022，42（1）：22－32. WANG Qiuhong, MA Chao, LIU Zhu, et al. A comparative analysis of combustion kinetic characteristics of three kinds of bituminous coals[J]. Journal of Xi’an University of Science and Technology, 2022, 42（1）: 22-32.
[22]	娄和壮，贾廷贵．ＴＧ－DＳＣ联用研究瓦斯气氛对煤自燃热特性的影响[J]．中国安全科学学报，2019，29（11）：77－82. LOU Hezhuang, JIA Tinggui. Study on thermal characteristics of coal spontaneous combustion in gas atmosphere by TG-DSC coupling techniques[J]. China Safety Science Journal, 2019, 29（11）: 77-82.
[23]	杨天华，杨小龙，魏砾宏，等．水溶Ｎａ对高碱煤热解及氮热变迁的影响[J]．煤炭学报，2020，45（9）：3284－3292. YANG Tianhua, YANG Xiaolong, WEI Lihong, et al. Influence of water-soluble sodium on the pyrolysis and thermal nitrogen transformation of high alkali coal[J]. Journal of China Coal Society, 2020, 45（9）: 3284-3292.
[24]	李晓曦，谭波．煤自燃阻化剂的阻化效果动力学分析及优选[J]．中国安全科学学报，2017，27（6）：79－84. LI Xiaoxi, TAN Bo. Dynamic analysis and optimization of coal spontaneous combustion inhibitors[J]. China Safety Science Journal, 2017, 27（6）: 79-84.

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