鞣花酸对下石节长焰煤氧化自燃的阻化影响研究  

Study on inhibition effect of ellagic acid on oxidation spontaneous combustion of long-flame coal in Xiashijie

作　　者：肖旸 南世华[1] 尹岚 李青蔚 王振平 XIAO Yang;NAN Shihua;YIN Lan;LI Qingwei;WANG Zhenping(School of Safety Science and Engineering,X'an University of Science and Technology,X'an Shaanxi 710054,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,X'an University of Science and Technology,X'an Shaanxi 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西安科技大学陕西省煤火灾害防治重点实验室,陕西西安710054

出　　处：《中国安全科学学报》2024年第8期78-85,共8页China Safety Science Journal

基　　金：国家自然科学基金资助(52174204,51974233)。

摘　　要：为考察鞣花酸(EA)对煤氧化自燃过程的影响,首先将EA与陕西铜川下石节煤矿的长焰煤以2%、4%、6%、8%和10%的质量比均匀混合进行试验;然后采用显微红外光谱试验和激光导热试验研究各个样品的活性官能团含量情况和热输运特性,通过评价煤氧化自燃抑制效果,确定最优质量比为8%;最后利用煤自燃程序升温试验对比4种阻化剂对煤氧化自燃气体释放的影响情况,进一步确定EA对煤氧化自燃的阻化程度。结果表明:EA处理煤(EA-tc)中-CH_(3)、-CH_(2)、-OH和-C=O-的峰面积相较于原煤(RC)均减少,但C-O的峰面积增加;在相同煤温下,RC的热扩散系数和导热系数高于EA-tc,其比热容低于EA-tc,且8%EA对RC低温氧化过程的热扩散系数、比热容和导热系数的平均抑制率分别为20.8%、9.8%和13.1%;相比于RC,8%EA-tc的CO释放量在170℃时降低52.3%,且EA对煤氧化自燃的阻化率在30~170℃内保持在50.5%~72.5%,说明EA对煤氧化自燃的阻化效果比其他3种阻化剂更好。In order to investigate the effect of EA on the process of coal oxidation spontaneous combustion,EA was uniformly mixed with long-flame coal in Xiashijie at the mass ratios of 2%,4%,6%,8%and 10%to experiment.The contents of active functional groups and the variation characteristics of thermal transport characteristics of each sample were studied using the microscopic infrared spectroscopy test and laser thermal conductivity test.The optimal mass ratio was determined to be 8%through the evaluation of the inhibitory effect of coal oxidation spontaneous combustion.The coal spontaneous combustion temperature-programmed test was used to compare the influence of four inhibitors on the gas release of coal oxidation spontaneous combustion,and the degree of inhibition of EA on coal oxidation spontaneous combustion was further determined.The results showed that the peak areas of-CH_(3),-CH_(2),-OH and-C=O-in EA-tc are reduced,but the peak area of C-O is increased compared with RC.At the same coal temperature,the thermal diffusivity and thermal conductivity of the RC are higher than those of EA-tc,and its specific heat is lower than those of EA-tc.The average inhibition rates of thermal diffusivity,specific heat capacity and thermal conductivity of 8%EA on low-temperature oxidation process of coal samples are 20.8%,9.8%and 13.1%,respectively.Compared with RC,CO release amount of 8%EA-tc is reduced by 52.3%at 170℃,and the resistance rate of EA on coal oxidation spontaneous combustion is maintained at 50.5%to 72.5%at 30 to 170℃.The inhibitory effect of EA on coal oxidation spontaneous combustion is better than that of the other three inhibitors.

关 键 词：鞣花酸(EA) 煤氧化自燃 阻化率 热输运特性 活性官能团 

分 类 号：X936[环境科学与工程—安全科学] TD752[矿业工程—矿井通风与安全]