Study on temperature variation of coal sample in process of freezing coring

doi:10.16265/j.cnki.issn 1003-3033.2021.02.011

Abstract

Abstract: In order to explore change characteristics of coal sample temperature during process of freezing coring, a test equipment was designed independently based on similarity of simulation tests. Temperature change was measured under equilibrium gas adsorption pressure of 0, 1.0, 2.0 and 3.0 MPa respectively for samples of different metamorphism selected from Yujialiang Mine, Shoushan No.1 Mine, Liulong Mine and Jiulishan Mine. Then, real-time data of their temperature change during freezing coring was analyzed. The results show that the technology's freezing effect is positively correlated with coal metamorphism and gas adsorption equilibrium pressure. It has better freezing performance on coal with gas than non-gas coal, better on high metamorphic coal than on low metamorphic one. During freezing coring, change curve of coal sample temperature with time accords with exponential function.

Key words: freezing coring, temperature of coal sample, gas adsorption equilibrium pressure, coal metamorphism, coal seam gas content

CLC Number:

X936

WANG Qiao, WANG Zhaofeng, Ma Shujun, Zhang Kangjia. Study on temperature variation of coal sample in process of freezing coring[J]. China Safety Science Journal, 2021, 31(2): 76-81.

References

[1] 任浩洋,王兆丰.测定瓦斯含量取样方式存在问题分析及解决对策[J].煤矿安全,2015,46(4): 148-151.
REN Haoyang, WANG Zhaofeng. Problem analysis and solutions about sampling way of gas content dermination [J]. Safety in Coal Mines, 2015, 46 (4): 148-151.
[2] 张宏图,魏建平,王云刚,等.煤层瓦斯含量测定定点取样方法研究进展[J].中国安全生产科学技术,2016, 12(1): 186-192.
ZHANG Hongtu, WEI Jianping, WANG Yungang, et al. Sampling methods for coaled gas content direct dermination [J].Journal of Safety Science and Technology, 2016, 12 (1): 186-192.
[3] 马树俊,王兆丰,任浩洋,等.低温变温条件下煤吸附瓦斯过程研究[J].中国安全科学学报, 2019, 29(10): 124-129.
MA Shujun, WANG Zhaofeng, REN Haoyang, et al. Study on gas adsorption process of coal at low and variable temperature [J]. China Safety Science Journal, 2019, 29 (10): 124-129.
[4] WANG Zhaofeng, TANG Xu, YUE Gaowei, et al. Physical simulation of temperature influence on methane sorption and kinetics in coal: benefits of temperature under 273.15 K[J]. Fuel, 2015, 158: 207-216.
[5] WANG Long, WANG Zhaofeng,QI Chenjun, et al. Physical simulation of temperature and pressure evolvement in coal by different refrigeration modes for freezing coring[J]. Acs Omega, 2019, 4(23): 20 178-20 187.
[6] YUE Jiwei, YUE Gaowei, WANG Zhaofeng, et al. Freezing method for rock cross-cut coal uncovering I: mechanical properties of a frozen coal seam for preventing outburst[J]. Scientific Reports, 2019, 9(1):16397.
[7] 唐巨鹏,田虎楠,马圆.突出煤层瓦斯吸附解吸特性核磁共振谱试验研究[J].中国安全科学学报,2017,27(4): 104-109.
TANG Jupeng, TIAN Hu'nan, MA Yuan. Experimental research on adsorption-desorption characteristics of methane in outburst coal by using nuclear magnetic resonance spectrums [J]. China Safety Science Journal,2017,27(4): 104-109.
[8] 王兆丰,柯巍,马向攀.低温取芯过程热传递方式的数值模拟和实验研究[J].中国安全生产科学技术,2018, 14(1): 35-41.
WANG Zhaofeng, KE Wei, MA Xiangpan. Numerical simulation and experimental study on way of heat transfer during low temperature coring process [J]. Journal of Safety Science and Technology,2008,14 (1): 35-41.
[9] 王兆丰,康博,岳高伟,等.低温环境无烟煤瓦斯解吸特性研究[J].河南理工大学学报:自然科学版,2014,33(6):705-709.
WANG Zhaofeng, KANG Bo, YUE Gaowei, et al. Study on gas desorption characteristics of anthracite coal in low temperature environment [J]. Journal of Henan Polytechnic University:Natural Science, 2014, 33 (6): 705-709.
[10] 闫江伟,薄增钦,杨亚磊.纳米级孔隙对构造煤吸附瓦斯能力的影响[J].中国安全科学学报,2018,28(10): 131-136.
YAN Jiangwei, BO Zengqin, YANG Yalei. Influence of nanoscale pore on gas adsorption capacity of deformed coal [J]. China Safety Science Journal, 2018, 28(10): 131-136.
[11] 岳高伟,王兆丰,康博.低温环境煤的瓦斯扩散系数时变特性[J].中国安全科学学报,2014,24(2): 107-112.
YUE Gaowei, WANG Zhaofeng, KANG Bo. Time-varying characteristics of gas diffusion coefficient in low temperature environment [J]. China Safety Science Journal,2014,24(2): 107-112.
[12] GB/T 212—2008, 煤的工业分析方法[S].
GB/T 212-2008, Proximate analysis of coal [S].
[13] GB/T 217—2008, 煤的真相对密度测定方法[S].
GB/T 217-2008, Determination of true relative density of coal[S].
[14] GB/T 6949—2010, 煤的视相对密度测定方法[S].
GB/T 6949-2010, Determination of apparent relative density of coal [S].

[1]	He Wen, He Gengfeng. Influence of pipelines wear by mine backfill slurry based on CFD-DEM method [J]. China Safety Science Journal, 2026, 36(5): 113-121.
[2]	Rong Hai, Xi Zhouyong, Li Jincheng, Pan Xiangyin, Zhang Weida, Han Mingyu. YOLOv8n-based personnel detection model for underground mines optimized with SPDs-Conv and WIoU [J]. China Safety Science Journal, 2026, 36(5): 139-149.
[3]	Zhang Jianguo, Wang Wenchang, Ren Lianwei, Zou Youfeng, Dun Zhilin. Parameter solution of probability integral method under condition of thick loose layer based on SAA-GRNN optimization model [J]. China Safety Science Journal, 2026, 36(5): 18-26.
[4]	Qin Kai, Deng Zhigang, Shu Longyong, Wei Shuaihao. Data reliability evaluation for coal mine disaster monitoring system [J]. China Safety Science Journal, 2026, 36(5): 190-198.
[5]	Zhang Yibo, Zhao Pengxiang, Li Shugang, Lin Haifei, Sun Hongxing, Liu Yuanjia. Intelligent design and application of high-level boreholes for pressure-relief gas drainage in coal seam mining [J]. China Safety Science Journal, 2026, 36(5): 215-223.
[6]	Jing Deji, Dong Zhibin, Wang Deji, Li Zhen, Liu Hongwei, Bao Chunhua. Experimental and simulation study on influence of pick cone angle on coal-rock fragmentation and dust-generation characteristics [J]. China Safety Science Journal, 2026, 36(5): 64-72.
[7]	Sheng Wu, Chu Xiaoyu, Wu Minwei. Fault diagnosis model for mine main hoists based on BO-XGBoost-SHAP architecture [J]. China Safety Science Journal, 2026, 36(5): 89-97.
[8]	Lyu Pengfei, Wang Yongliang, Liang Ye, Qi Yun, Geng Yijian, Sun Yuting. Study on rock burst danger and double entry inward layout optimization for rock burst prevention under condition of inclined thick coal seam [J]. China Safety Science Journal, 2026, 36(4): 132-141.
[9]	Teng Yifei, He Ziqi, Fu Yu, Quan Mingxu, Liu Chang, Cui Zheng. Performance mechanism of supported cobalt-copper catalyst for CO elimination [J]. China Safety Science Journal, 2026, 36(4): 152-159.
[10]	Liang Bing, Zhang Shiyao, Sun Weiji, Zhang Xiaoyang, Nie Tao. Analysis of CO₂ displacement CH₄ and storage effect in different stratified coals [J]. China Safety Science Journal, 2026, 36(4): 65-74.
[11]	Wang Lichuan, Xiao Hongwu, An Fenghua, Liu Yanlong, Wang Zhaofeng, Zhou Zongqing. Prevention and control technologies for abnormal gas emission in tunnel construction through unstable coal-bearing strata [J]. China Safety Science Journal, 2026, 36(4): 85-93.
[12]	ZHANG Jie, YANG Ke, FAN Chaochen. Prediction method of support load in coal mining face based on MTAM-LSTM [J]. China Safety Science Journal, 2026, 36(3): 144-152.
[13]	ZHANG Xiaoying, LIN Haifei, YAN Min, WANG Ruizhe, QIU Yue, ZHOU Xing. Experimental study on influence of ultrasonic stimulation on kinetic characteristics of gas diffusion in coal [J]. China Safety Science Journal, 2026, 36(3): 153-161.
[14]	XIE Zunxian, MA Haohao, JIANG Song, WU Xiaoyun. Prediction of slope instability in open-pit mine waste dumps based on GA-BP neural network [J]. China Safety Science Journal, 2026, 36(3): 81-88.
[15]	ZHAO Bo. Risk assessment model for embankment slope failure in mining goafs [J]. China Safety Science Journal, 2026, 36(2): 121-126.