Experimental study on effects of plus water content on low-temperature oxidation of coal

doi:10.16265/j.cnki.issn1003-3033.2019.09.013

Abstract

Abstract: In order to determine inhibition effects of plus water content on coal's self combustion, low temperature oxidation experiment and thermal analysis technique were adopted to test indicators like carbon monoxide occurrence, ethylene production, oxygen consumption rate, crossing point and endothermal peak temperature, and low-temperature oxidation characteristics of coal samples with different water content were analyzed. The experimental results show that oxygen consumption and oxidation gas production are larger compared with natural air-dried coal samples when content is in the range of(0, 9%], and increase of water content speeds up spontaneous combustion of coal.Oxygen consumption and oxidation gas production are smaller in the range of(9, 25%], and spontaneous combustion of coal will be inhibited by increase of water content. Crossing point and endothermic peak temperature reach minimum with 9% of water content within all tested coal samples. Therefore, when adopting hydraulic fire-fighting measures, attention should be paid to humidifying effects of coal to ensure that residual coal is with corresponding water content.

Key words: spontaneous combustion of coal, plus water content, low-temperature oxidation, gob, oxygen consumption rate

CLC Number:

X936

LI Wanhong, CHU Tingxiang, LIU Wende, ZHOU Liping, ZENG Yanming. Experimental study on effects of plus water content on low-temperature oxidation of coal[J]. China Safety Science Journal, 2019, 29(9): 84-89.

References

[1] 王德明,亓冠圣,戚绪尧,等.煤实验最短自然发火期的快速测试[J].煤炭学报,2014,39(11): 2 239-2 243.
WANG Deming, QI Guansheng, QI Xuyao, et al. Quick test method for the experimental period minimum of coal to spontaneous combustion[J].Journal of China Coal Society,2014,39(11): 2 239-2 243.
[2] 雷丹, 王德明, 仲晓星, 等.水分对煤低温氧化耗氧量影响的研究[J].煤矿安全, 2011, 42(7): 28-37.
LEI Dan, WANG Deming, ZHONG Xiaoxing, et al. Analysis of effect of water content to oxygen consumption of coal oxidation at low- temperature [J]. Safety In Coal Mines, 2011, 42(7): 28-37.
[3] 郭小云,王德明,李金帅.外在水分对煤低温氧化特性的阻化作用研究[J]. 煤矿安全, 2011, 42(5): 9-15.
GUO Xiaoyun, WANG Deming, LI Jinshuai. Study of the inhibition effect of external moisture in coal oxidation in low temperature [J]. Safety in Coal Mines, 2011, 42(5): 9-15.
[4] 何启林,王德明. 煤水分含量对煤吸氧量与放热量影响的测定[J].中国矿业大学学报,2005, 34(3): 358-362.
HE Qilin, WANG Deming. Influence of moisture on absorbed oxygen and released heat of coal [J].Journal of China University of Mining & Technology, 2005, 34(3): 358-362.
[5] 邓军, 王凯, 翟小伟, 等. 高地温环境对煤自燃特性影响的试验研究[J]. 煤矿安全, 2014, 45(3): 13-15.
DENG Jun, WANG Kai, ZHAI Xiaowei, et al. Experimental study on the effect of high ground temperature environment on coal spontaneous combustion characteristics [J]. Safety in Coal Mines, 2014, 45(3): 13-15.
[6] 姜德义, 李林, BEAMISH B B. 湿度对煤自燃倾向性影响[J]. 重庆大学学报,2008, 31(12): 1 451-1 454.
JIANG Deyi, LI Lin, BEAMISH B B. The effect of moisture content on the tendency of coal to combust spontaneously [J].Journal of Chongqing University, 2008, 31(12): 1 451-1 454.
[7] 文虎, 王栋, 赵彦辉, 等. 水浸煤体自燃特性实验研究[J]. 煤炭技术, 2015, 34(1): 261-263.
WEN Hu, WANG Dong, ZHAO Yanhui, et al. Experimental study on coal spontaneous combustion characteristics of soaked [J]. Coal Technology, 2015, 34(1): 261-263.
[8] KUROSE R, TSUJI H, MAKINO H. Effects of moisture in coal on pulverized coal combustion characteristics [J]. Fuel, 2001, 80(10): 1 457-1 465.
[9] 唐一博,李云飞,薛生,等.长期水浸对不同烟煤自燃参数与微观特性影响的实验研究[J].煤炭学报,2017,42(10): 2 642-2 648.
TANG Yibo, LI Yunfei, XUE Sheng, et al.Experimental investigation of long-term water immersion effect on spontaneous combustion parameters and microscopic characteristics of bituminous[J].Journal of China Coal Society,2017,42(10): 2 642-2 648.
[10] YANG Yongliang, LI Zenghua, SI Leilei, et al.Study governing the impact of long-term water immersion on coal spontaneous ignition [J]. Arabian Journal for Science ＆ Engineering,2017,42: 1 359-1 369.