Study on the effect of coal microscopic pore structure to its spontaneous combustion tendency

• Autorzy: Dong Xianwei , Li Gaojing , Dong Xuanmeng , Wang Fusheng

Identyfikatory

DOI

10.46873/2300-3960.1351

• Języki publikacji: EN

Abstrakty

EN

Coal is a porous medium. Due to the large number of pores in coal and the pore size on its surface, usually ranging from millimeter to nanometer, it is difficult to measure and analyze the microscopic pore structure of coal. In order to investigate the effect of the microscopic pore structure of coal on its spontaneous combustion tendency, coal samples from different coal mines of the Kailuan Group were selected as the research objects, and the data of the microscopic pore distribution of three different coal samples were measured by using mercury injection apparatus. The regression analysis of microscopic pore data of coal samples obtained in the mercury injection experiment shows that the correlation coefficients of the regression curves are all greater than 0.94 and the fitting degree is good, indicating that there is a good correlation between the pressure, mercury intake and pore size of the coal samples, indicating that the fractal dimension of pore distribution is very effective. The fractal dimension is generally between 2 and 3, indicating that the microscopic pores of coal samples have good fractal characteristics and meet the fractal theory to describe the distribution characteristics of microscopic pores in porous media. Through the simulation system of natural combustion of coal, the simulation experiment of temperature rise oxidation of different coal samples (gas coal, fat coal, and coke coal) was carried out, and the curve of the concentration of gas products CO and CO2 in the process of temperature rise and oxidation of coal samples was drawn in the experiment. The experimental results show the relationship between the distribution structure of coal pores and its spontaneous combustion tendency, and the coal with a good distribution dimension has a stronger combustion tendency.

Słowa kluczowe

EN

spontaneous combustion tendency; mercury injection; fractal dimension; indicator gases

PL

tendencja do samozapłonu; porozymetria rtęciowa; wymiar fraktalny; gazy wskaźnikowe

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2022
• Tom: Vol. 21, iss. 2
• Strony: 120--127
• Opis fizyczny: Bibliogr. 42 poz.

Twórcy

autor

Dong Xianwei

• North China University of Science and Technology, College of Mining Engineering, China

autor

Li Gaojing

• North China University of Science and Technology, College of Mining Engineering, China

autor

Dong Xuanmeng

• North China University of Science and Technology, College of Mining Engineering, China

autor

Wang Fusheng

• North China University of Science and Technology, College of Mining Engineering, China

Bibliografia

• [1] Xu Li, Zhang Xinghua, Cong Xuizhi, Yu Tao. Study on absorption capacity of coal based on low-temperature nitrogen absorption and high-pressure adsorption. Saf Coal Mine 2009;40(5):9-11.
• [2] Hu Wen, Dai Aiping. Discuss molecular structure model of describing coal spontaneous combustion. Coal Convers 2004; (2):13-8.
• [3] Zhang Li, He Xuequi, Wang EnYuan, Liu Zhentang, Ma Sangquan. Study of absorptive characteristics of coal. J Taiyuan Univ Technol 2001;32(5):449-51. https://doi.org/10.16355/j.cnki.issn1007-9432tyut.2001.05.003.
• [4] Zhong LingWen, Zhang Hui, Yuan ZhengRong, Lei Chongli. Influence of specific pore area and pore volume of coal on adsorption capacity. Coal Geol Explor 2002;(3):26-9.
• [5] Nie BaiSheng, Duan ShanMing. The adsorption essence of gas on coal surface. J Taiyuan Univ Technol 1998;(4):88-92. https://doi.org/10.16355/j.cnki.issn1007-9432tyut.1998.04.027.
• [6] Ma ZF. Coal field fire: disaster without geographical boundaries. Encycl Knowl 2010;(22):17-9 [in Chinese].
• [7] Yin Zhijun, Sheng Guojun, Wang Chunguang. Fractal dimension of varied pore within coal based on mercury intrusion method. Metal Mine 2011;(9):54-7.
• [8] Wang ShengShen, Zhang GuoShu. Coal mine fire prevention and control. Xuzhou: China University of Mining press; 1990.
• [9] Yan RongLin, Qian Guoyin. Molecular structure of coal and gases produced by coal oxidation. J China Coal Soc 1995;(S1): 58-64.
• [10] Wang DeMing. Mine fire science. Xuzhou: China university of mining press; 2007.
• [11] Lu Wei, Hu Qianting. Relation between the change rules of coal structures when being oxidized and spontaneous combustion process of coal. J China Coal Soc 2007;(9):939-44.
• [12] He Ping, Wang Feiyu, et al. Characteristics of gases produced in process of coal oxidation and their relations with selection of gas markers for prediction of spontaneous combustion. J China Coal Soc 1994;(6):635-43.
• [13] Qi Xuyao. Oxidation and self-reaction of active groups in coal. J China Coal Soc 2011;36(12):2133-4. https://doi.org/10.13225/j.cnki.jccs.2011.12.032.
• [14] Zhong Xiaoxing, Wang Deming. The variation characteristics of free radicals in coal oxidation. J China Coal Soc 2010; 35(12):960-3. https://doi.org/10.13225/j.cnki.jccs.2010.06.002.
• [15] Liu GuoGen, Zhou Qiu Guan. Study on infrared spectra of coals. J Cent S Univ Technol 1999;(4):371-3.
• [16] Jinwei Hao, Yang Li. Multi-scale fractal characterization of pore structure of structural coal and its influencing factors. Coal Sci Technol 2020;48(8):164-74. https://doi.org/10.13199/j.cnki.cst.2020.08.021.
• [17] Feng Yousen. Study on the correlation between coal microscopic pore structure and spontaneous combustion characteristics. Taiyuan University of Technology; 2015.
• [18] Yuan Tao. Experimental study on spontaneous combustion characteristics of 1/3 coke oxidized coal samples. Anhui University of Science and Technology; 2014.
• [19] Liu Yinan, Liu Yong, Xin Fudong, hongyu Wei. Applicability analysis and correction method of mercury injection experiment for characterization of low rank coal. Coal Geol Explor 2020;48(4):118-25.
• [20] Li Jiarun, Zou Qizhu. Study on pore structure characteristics of coal samples based on mercury injection experiment. In: Proceedings of the 27th annual conference of Beijing Force Society; 2021. p. 1299-302. https://doi.org/10.26914/c.cnkihy.2021.001964.
• [21] Yuan Yuan, He Gang. Comparative analysis of experimental methods based on microstructure characteristics of coal. J Huain Norm Univ 2021;23(2):122-5.
• [22] Yang Ming, Liu Lei, liu Jia-jia, Mao Junrui, Pei Chai. Nitrogen adsorption-mercury porosition-nuclear magnetic resonance combined characterization of pore structure of midrank coal. Coal Sci Technol 2021;49(5):67-74. https://doi.org/10.13199/j.cnki.cst.2021.05.009.
• [23] Xu tao. Experimental study on sectional characteristics and mechanism of spontaneous combustion of coal. Beijing: Beijing: China University of Mining and Technology; 2012.
• [24] Ma Hanpeng, Lu Wei. Systematic study on gas generation regularity of coal spontaneous combustion index. Min Safet Environ Prot 2007;(6):4-6þ9þ95.
• [25] Zou Mingjun, Zhongtao Wei, Zhang Miao, Qi Yu, Shao Changkiu. Fractal classification of coal pore system based on mercury injection experiment. Coal Eng 2013; 45(10):112-4.
• [26] Basil Beamish B, Barakat Modher A, George John D St. Spontaneous - combustion propensity of New Zealand coals under adiabatic conditions. Int J Coal Geol 2001;45(2):217-24.
• [27] wang Chin-feng, Zhao Wen-bin, Liu Qing, Wang, Zhen-wu Li, Xu Xingkui, et al. Study on the influence of coal quality change on spontaneous combustion of coal seam with different depth. J Saf Environ 2021:1-11. https://doi.org/10.13637/j.issn.1009-6094.2021.0087 [2022-02-27.
• [28] Lu wei. Formation mechanism of gaseous products during spontaneous combustion of coal. J Hunan Univ Sci Technol 2009;24(2):10-3.
• [29] Qi Lingling, Wang Zhaofeng, Yang Hongmin, et al. Study on pore structure of coal samples based on low temperature nitrogen adsorption and Mercury injection method. Coal Sci Technol 2012;40(8):36-39þ87. https://doi.org/10.13199/j.cst.2012.08.39.qill.015.
• [30] He Qilin. Experimental and simulation study on low temperature oxidation and spontaneous combustion of coal. Beijing: Beijing: China University of Mining and Technology; 2004.
• [31] Cheng Qingying, Huang Bingxiang, Li Zenghua. Research status of pore and fracture of coal. Coal Eng 2011;(12):91-3.
• [32] Zhang Weiqing, Jiang Shuguang, Wu Zhengyan, et al. Review on natural properties of coal surface. Coal Mine Safet 2012;43(1):15-8. https://doi.org/10.13347/j.cnki.mkaq. 2012.01.010.
• [33] Zhang Xiaowen, Zhou Xihua, Bai Gang, Wang Cheng. Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention. Sci Rep 2021;11(1). https://doi.org/10.1038/S41598-021-98422-W.
• [34] Chen Junchao, et al. Experimental study on the spatial and temporal variations of temperature and indicator gases during coal spontaneous combustion. Energy Explor Exploit 2021;39(1). https://doi.org/10.1177/0144598720964160.
• [35] Wang Yuguo. Characteristic analysis of different stages of coal spontaneous combustion in Longwanggou Coal Mine. Coal Econ Inner Mong 2021;(14):37-8.
• [36] Wang Caiping, Chen Lijuan, Bai Zujin, Deng Jun, Liu Li, Xiao Yang. Study on the dynamic evolution law of spontaneous coal combustion in high-temperature regions. Fuel 2022;314. https://doi.org/10.1016/J.FUEL.2021.123036.
• [37] Yuan Yuan, Cai Feng, Yang Lingling. Pore structure characteristics and fractal structure evaluation of medium- and high-rank coal. Energy Explor Exploit 2022;40(1). https://doi.org/10.1177/01445987211034315.
• [38] Wang Jiren, Deng Cunbao, Shan Yafei, Hong Lin, Lu Weidong. A new classifying method of the spontaneous combustion tendency. J China Coal Soc 2008;(1):47-50.
• [39] Qu Shixian, Zhang Jianhua. Fractal and fractal dimension and its application in geophysics. J Xi'an Petrol Inst (Nat Sci Ed) 1991;(2):8-13.
• [40] Jia Xiaoliang, Wu Jiaokun, Lian Changjun, Wang Jianjun, Rao Jilai, Feng Renjun, et al. Investigating the effect of coal particle size on spontaneous combustion and oxidation characteristics of coal. Environ Sci Pollut Res Int 2021;29(11). https://doi.org/10.1007/S11356-021-16929-1.
• [41] Qin Lei, Li Shugang, Cheng Zhai, Lin Haifei, Yu Shi. Joint analysis of pores in low, intermediate, and high rank coals using mercury intrusion, nitrogen adsorption, and nuclear magnetic resonance. Powder Technol 2020;362(C). https://doi.org/10.1016/j.powtec.2019.12.019.
• [42] Dong xian-wei, Wang Fu-sheng, Meng Yaning. Effect of micropore structure on spontaneous combustion tendency of coal. Coal Sci Technol 2014;42(11):41-5. https://doi.org/10.13199/j.cnki.cst.2014.11.012. þ49.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).