氧气浓度对煤氧化特性及自燃极限参数影响的实验研究
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摘要
为了研究不同氧气浓度情况下,煤的自燃特性和极限参数的变化规律。采用煤自燃程序升温实验对煤样在21%,14%,8%和4%这四种氧气浓度情况下氧化过程进行了测试。得到了煤氧化过程中的耗氧速率和放热强度,并计算得到煤的自燃极限参数。实验结果表明:降低氧气浓度会使煤氧化过程中的耗氧速率和放热强度出现显著的降低。煤的最小浮煤厚度随煤温的升高,呈现先升高后降低的趋势,而上限漏风强度变化趋势正好相反。最小浮煤厚度的最大值和上限漏风强度最小值出现温度与煤样的临界温度相近。降低氧气浓度会显著抑制煤的氧化放热,造成煤的最小浮煤厚度明显增加,下限漏风强度明显降低。
In order to study the variation rule of coal spontaneous combustion characteristics and limit parameters under different oxygen concentrations,the oxidation process of coal samples at 21%,14%,8% and 4% oxygen concentrations were tested by temperature programmed experiments respectively,the oxygen consumption rate and exothermic intensity in coal oxidation process of were obtained,and the limit parameters of coal spontaneous combustion were calculated. The experimental results show that reducing the oxygen concentration can significantly decrease the oxygen consumption rate,exothermic intensity and lower limit air leakage strength,and obviously increase minimum floating coal thickness.
In order to study the variation rule of coal spontaneous combustion characteristics and limit parameters under different oxygen concentrations,the oxidation process of coal samples at 21%,14%,8% and 4% oxygen concentrations were tested by temperature programmed experiments respectively,the oxygen consumption rate and exothermic intensity in coal oxidation process of were obtained,and the limit parameters of coal spontaneous combustion were calculated. The experimental results show that reducing the oxygen concentration can significantly decrease the oxygen consumption rate,exothermic intensity and lower limit air leakage strength,and obviously increase minimum floating coal thickness.
引文
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[2]梁运涛,侯贤军,罗海珠,等.我国煤矿火灾防治现状及发展对策[J].煤炭科学技术,2016,44(6):1-6.
[3]邓军,马威,张辛亥,等.复采工作面采空区浮煤自燃火灾的治理[J].煤炭科学技术,2010,38(2):43-45.
[4]Е.И.扎哈罗夫,蒋丰.井下煤自然火灾发展初期火源的发现[J].国外煤炭,1991,10(1):45-46,10.
[5]刘贝,黄文辉,敖卫华,等.我国煤炭自燃影响因素分析[J].煤炭科学技术,2013,41(S2):218-221.
[6]易欣,邓军.煤自燃极限参数的试验研究[J].矿业安全与环保,2006,35(1):18-20.
[7]张辛亥,李青蔚.预氧化煤自燃特性试验研究[J].煤炭科学技术,2014,42(11):37-40.
[8]郭兴明,徐精彩,惠世恩,等.煤自燃过程中极限参数的研究[J].西安交通大学学报,2001,35(7):682-686.
[9]徐精彩,文虎,邓军,等.煤自燃极限参数研究[J].火灾科学,2000,9(2):14-18.
[10]谭波,胡瑞丽,李凯,等.不同变质程度烟煤的自燃极限参数对比分析[J].煤炭科学技术,2013,41(5):63-67.
[11]马砺,任立峰,韩力,等.粒度对采空区煤自燃极限参数的影响试验研究[J].煤炭科学技术,2015,43(6):59-64.
[12]马砺,任立峰,艾绍武,等.氯盐阻化剂对煤自燃极限参数影响的试验研究[J].安全与环境学报,2015,15(4):83-88.
[13]孟倩,王洪权,王永胜,等.煤自燃极限参数的支持向量机预测模型[J].煤炭学报,2009,34(11):1489-1493.
[14] Qi G,Wang D,Zheng K,et al. Kinetics characteristics of coal low-temperature oxidation in oxygen-depleted air[J]. Journal of Loss Prevention in the Process Industries,2015,35:224-231.
[15]袁林.变氧浓度环境下煤自燃特性实验研究[D].西安:西安科技大学,2014.
[16]王晋生,张俊生.不同氧浓度下煤自燃CO生成规律研究[J].能源与环保,2015,37(8):33-35.
[17]张晞,史波波,邵和,等.变氧浓度条件下崔家寨矿煤自燃特性的实验研究[J].湖南科技大学学报(自然科学版),2010,25(4):16-20.
[18]王海燕,李凯,高鹏.氧浓度对煤绝热氧化过程特征的影响[J].中国安全科学学报,2013,23(6):58-62.
[19] Deng J,Xiao Y,Li Q,et al. Experimental studies of spontaneous combustion and anaerobic cooling of coal[J]. Fuel,2015,157:261-269.
[20]郭艾东.煤自燃阶段特征及采空区自燃区域变化规律研究[D].北京:中国矿业大学(北京),2012.