基于微观结构和气体产物特征的风化煤与氧化煤自燃差异研究
Study on spontaneous combustion difference between weathered coal and oxidized coal based on gas products and microstructure characteristics
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摘要: 为了掌握煤自燃特征温度下风化煤和氧化煤关键活性基团的关系与区别，将新鲜煤样作为参照煤样，对比分析风化煤和氧化煤的微观结构和气体产物特征；首先采用傅里叶变换红外光谱，分析风化煤与氧化煤在初始状态的活性官能团相对含量及特征结构参数，确定了特征温度下4类主要活性基团的变化规律，对风化煤与氧化煤不同活性官能团的差异进行了半定量对比分析，揭示了造成风化煤和氧化煤自然发火自燃特征差异性的关键活性官能团；通过煤自燃程序升温实验，分析了风化煤与氧化煤标志气体体积分数释放特征，对特征温度下关键官能团的演化迁移进行了验证。结果表明：由于含氧官能团中C-O-C含量的不同导致氧化煤产生CO含量大于风化煤，而脂肪烃中甲基、亚甲基不对称伸缩振动的含量不同导致风化煤产生的C2H6含量大于氧化煤，并且在实验过程中风化煤率先产生C2H4。Abstract: In order to master the relationship between the key active groups of weathered coal and oxidized coal at the characteristic temperature of coal spontaneous combustion, this paper takes the fresh coal as the reference coal to compare and analyze the microstructure of weathered coal and oxidized coal. Firstly, the relative content of active functional groups and characteristic structural parameters of weathered coal and oxidized coal in the initial state were analyzed by Fourier transform infrared spectroscopy, the variation laws of four main active functions under characteristic temperature were determined, and the differences of different active groups between weathered coal and oxidized coal were semi quantitatively analyzed. The key active groups affecting the difference of natural ignition between weathered coal and oxidized coal are revealed. Through the programmed temperature rise experiment of coal spontaneous combustion, the release characteristics of index gas concentration of weathered coal and oxidized coal were analyzed, and the evolution and migration of key functional groups at characteristic temperature were verified. The results show that the content of CO produced by oxidized coal was higher than that of weathered coal due to the different content of C-O-C in oxygen-containing functional groups, while the content of C2H6 produced by weathered coal was higher than that of oxidized coal due to the different asymmetric stretching vibration of methyl and methylene in aliphatic hydrocarbons.
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Keywords:
- weathered coal /
- oxidized coal /
- key functional groups /
- structural parameters /
- index gas /
- spontaneous combustion
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[1] 张艳芳，王福生，王建涛．复采煤层氧化煤的自燃特性研究[J].煤矿安全，2021，52（5）：31-35. ZHANG Yanfang, WANG Fusheng, WANG Jiantao. Study on spontaneous combustion characteristics of oxidized coal in remining coal seam[J]. Safety in Coal Mines, 2021, 52（5）: 31-35.
[2] 李青蔚，任立峰，任帅京.煤低温贫氧氧化放热特性研究[J].煤矿安全，2020，51（11）：34-38. LI Qingwei, REN Lifeng, REN Shuaijing. Study on low-temperature oxidation characteristics of coal under oxygen deficient atmosphere[J]. Safety in Coal Mines, 2020, 51（11）: 34-38.
[3] Sharma A, Kyotani A, Tomita A. Quantitative evaluation of structural transformations in raw coals on heat-treatment using HRTEM technique[J]. Fuel, 2001, 80（10）: 1467-1473. [4] Zhang Y, Wu B, Liu S H, et al. Thermal kinetics of nitrogen inhibiting spontaneous combustion of secondary oxidation coal and extinguishing effects[J]. Fuel, 2020, 278: 118223. [5] Wang K, Liu X R, Deng J, et al. Effects of pre-oxidation temperature on coal secondary spontaneous combustion[J]. Journal Thermal Analysis Calorimetry, 2019, 138: 1363-1370. [6] Deng J, Zhao J Y, Huang A C, et al. Thermal behavior and microcharacterization analysis of second-oxidized coal[J]. Journal Thermal Analysis Calorimetry, 2017, 127: 439-448. [7] Deng J, Zhao J Y, Zhang Y N, et al. Study on coal spontaneous combustion characteristic temperature of growth rate analysis[J]. Procedia Engineering, 2014, 84: 796-805. [8] Song J J, Deng J, Zhao J Y, et al. Critical particle size analysis of gas emission under high-temperature oxidation of weathered coal[J]. Energy, 2021, 214: 118995. [9] Wagner N J. The characterization of weathered discard coals and their behaviour during combustion[J]. Fuel, 2008, 87: 1687-1697. [10] Smedowski t, Wojtaszek M. Impact of weathering on coal properties and evolution of coke quality described by optical and mechanical parameters[J]. International Journal Coal Geology, 2016, 168: 119-130. [11] Solomon P R. Relation between coal structure and thermal decomposition product[J]. Coal Structure: Advances in Chemistry Series, Washington, DC: ACS Publications, 1981: 95-112. [12] 朱学栋，朱子彬，韩崇家，等.煤中含氧官能团的红外光谱定量分析[J].燃料化学学报，1999，27（4）：335. ZHU Xuedong, ZHU Zibin, HAN Chong, et al. Quantitative determination of oxygen-containing functional groups in coal by FTIR spectroscopy[J]. Journal of Fuel Chemistry and Technology, 1999, 27（4）: 335.
[13] 冯杰，李文英，谢克昌．傅里叶红外光谱法对煤结构的研究[J]，中国矿业大学学报，2002，31（5）：362. FENG Jie, LI Wenjie, XIE Kechang. Research on coal structure using FTIR[J]. Journal of China Unversity of Mining & Technology, 2002, 31（5）: 362.
[14] 赵婧昱，张宇轩，宋佳佳，等.高温贫氧下不同温度阶段煤体自燃指标气体测试[J].西安科技大学学报，2019，39（2）：189-193. ZHAO Jingyu, ZHANG Yuxuan, SONG Jiajia, et al. Coal spontaneous combustion indicator gases analysis of different temperature stages upon high-temperature and low-oxygen condition[J]. Journal of Xi’an University of Science and Technology, 2019, 39（2）: 189.
[15] Ibarra I, Munoz J, Moliner R. FTIR study of the evolution of coal structure during the coalification process[J]. Organic Geochemistrym, 1996, 24（6/7）: 725-735. [16] Kus J, Misz-Kennan M, ICCP. Coal weathering and laboratory （artificial） coal oxidation[J]. International Journal of Coal Geology, 2017, 171: 12-36. [17] Krumins J, Yang Z P, Zhang Q, et al. A study of weathered coal spectroscopic properties[J]. Energy Procedia, 2017, 128: 51-58. [18] Michalina K M, Martyna T. Comparison of the first stage of the thermal decomposition of Polish coals by diffuse reflectance infrared spectroscopy[J]. Journal of the Energy Institute, 2018, 91: 240-250. [19] 王颖，王晓霞，马力通，等.黄腐植酸对褐煤生物甲烷化的影响[J]. 现代化工，2021，41（10）：153-156. WANG Ying, WANG Xiaoxia, MA Litong, et al. Effect of fulvic acid on methane production from lignite by bio route[J]. Modern Chemical Industry, 2021, 41（10）: 153-156.
[20] 谭波，邵壮壮，郭岩，等.基于指标气体关联分析的煤自燃分级预警研究[J].中国安全科学学报，2021，31（2）：33-39. TAN Bo, SHAO Zhuangzhuang, GUO Yan, et al. Research on grading and early warning of coal spontaneous combustion based on correlation analysis of index gas[J]. China Safety Science Journal, 2021, 31（2）: 33-39.
[21] 赵婧昱，张永利，邓军，等.影响煤自燃气体产物释放的主要活性官能团[J].工程科学学报，2020，42（9）：1139-1148. ZHAO Jingyu, ZHANG Yongli, DENG Jun, et al. Key functional groups affecting the release of gaseous products during spontaneous combustion of coal[J]. Chinese Journal of Engineering, 2020, 42（9）: 1139-1148.
[22] 邓军，宋佳佳，赵婧昱，等.高温氧化条件下风化煤自燃特性试验研究[J].煤炭科学技术，2017，45（1）：73-77. DENG Jun, SONG Jiajia, ZHAO Jingyu, et al. Experiment study on spontaneous combustion features of weathered coal under condition of high temperature oxidation[J]. Coal Science and Technology, 2017, 45（1）: 73-77.
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