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].

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