煤低温氧化标志性气体变化规律  

The experimental study on gas product variation of coal oxidation in low- temperature

作　　者：吴阳阳[1,2] 穆朝民[1,2] 胡嘉伟[1,2] 陈磊[1,2] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]煤矿安全高效开采教育部重点实验室,安徽淮南232001

出　　处：《矿业工程研究》2014年第3期52-57,共6页Mineral Engineering Research

基　　金：安徽省自然科学基金资助项目(1208085QE85)

摘　　要：利用煤在低温氧化过程中会产生一些氧化气体产物,而这些气体产物中有些可以作为指标气体,了解这些气体的变化规律可以有效的预报采空区煤炭的自然发火.通过对龙东煤矿7128工作面煤层的新鲜煤样和氧化煤样进行低温氧化实验对比,测量新鲜煤样和氧化煤样在不同的温度下产生的气体产物,结果表明:氧化煤样是新鲜煤样的延续,新鲜煤样和氧化煤样在进行低温氧化都能够产生CO,CO2,CH4,C3H8,C2H4,C2H6,C2H2,C4H10和iC4H10等氧化气体,但所产生气体时的温度不一.7煤在达到70℃后可将CO作为煤炭自燃早期预报的指标气体,C2H4可作为辅助指标气体.需要采用指标气体增长趋势与临界值共同预报采空区遗煤氧化情况.对煤的低温氧化实验规律研究可以用来对采空区内温度进行监测以防止煤炭自然发火.In low temperature oxidation experiment, coal can produce oxidation gas products, some of which can be used as the indicator gases. An understanding of the change rule of these gases can effectively forecast the spontaneous combustion in mined -out area. Through the comparison between the fresh coal samples and the oxidized coal samples in the coal seam of 7128 workface in Longdong Coal Mine in low temperature oxidation experiment, the gaseous products of fresh coal samples and those of oxidized coal samples are measured in different temperatures. Results show that the oxidized coal samples are the continuation of fresh coal samples, and both of them can produce such oxidizing gases as C0,C02,CH4,C3H8,C2H4,C2H6,C2H2,C4H10,iC4H10, but the temperatures of the gases produced are different. In addition, when the temperature reaches 70 ℃, CO can be used as the indicator gases and C2H4 as the auxiliary index gases to serve as the early prediction of coal spontaneous combustion in 7^# coal seam. Both the increase trend and the critical value of indicator gases can be adopted to forecast the mined - out area of coal oxidation conditions. In order to prevent the coal from spontaneous combustion, the research on coal＇ s low temperature oxidation experiment will monitor the temperature in mine -out areas.

关 键 词：低温氧化 指标气体 氧化产物特征 变化规律 

分 类 号：TQ531.6[化学工程—煤化学工程]