摘要
在煤自燃过程中,随氧化进程的不同会依次释放出不同的气体,这些气体的出现及释放量能反映煤氧化自燃的程度。为了准确预报纳林河二号井的自燃发火,利用程序升温试验装置和气相色谱仪研究了3-1煤的自燃氧化特性,以及自燃升温过程中产生氧化气体和碳氢类气体随温度的变化规律,分析了φ(C2H4)/φ(C2H6)、φ(C3H8)/φ(C2H6)等烯烷比和链烷比曲线。结果表明:纳林河二号井3-1煤的自燃临界温度约为60℃,干裂临界温度约为105℃;3-1煤在常温下就能产生CO,且产生量与温度呈指数关系;C2H4出现的温度为65℃,在温度高于120℃后气体产生量呈现单调递增趋势。结合指标气体优选一般原则,确定纳林河二号井3-1煤层自燃指标气体应以C2H4与CO为主,以C3H8、φ(C2H4)/φ(C3H8)为辅。
The given study is to introduce the findings of our optimal experimental research on the spontaneous combustion index gas of 3-1 coal seam in Nalin River No.2 Mine. As is known, the spontaneous combustion of coal may release different kinds of gases, such as CO, CO 2 , CH 4 , C 2 H 6 , C 2 H 4 and C 3 H 8 . And these gases may reflect different degrees of the coal oxidation more or less inherently. In order to forecast and predict the spontaneous combustion situation and authentic process in Nalin River No.2 Mine more accurately and appropriately, we have made systematic experimental investigations and explorations of the programmed temperature elevation process, the gas chromatography, the oxidation characteristic features and behaviors of such spontaneous combustion in the 3-1 coal seam so as to discover the changing regularities of the oxidation gases and carbon hydrogen gases at different coal temperatures in the coal oxidized spontaneous combustion process in-situ. Furthermore, we were attempting to trace the curve regularity of φ （C 2 H 4 ）/ φ （C 2 H 6 ）, φ （C 3 H 8 ）/ φ （C 2 H 6 ） and other ratios. The results of our observation and experimental research show that the spontaneous critical temperature of 3-1 coal seam is about 60℃, and the dry cracking critical temperature is about 105℃. And, profoundly speaking, it can be concluded that the critical temperature of CO taking place following the 3-1 coal seam self-burning is about 15℃. And the production of CO threshold value reveals an exponential relationship with the temperature rising. For example, the beginning of the burning temperature of C 2 H 4 proves to be about 65℃, with the quantity of C 2 H 4 showing a monotony increase at about 120℃. Based on the general principle of the index gas selection, we have chosen CO, C 2 H 4 as the coal spontaneous combustion index gas for the said coal seam, whereas φ （C 3 H 8 ）, φ （C 2 H 4 ）/ φ （C 3 H 8 ） can be taken as the auxiliary indicators for predicting and forecas
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第3期118-122,共5页
Journal of Safety and Environment
基金
中国煤炭科工集团科技创新基金项目(2012MS001)
煤炭科学研究总院科技发展基金项目(2012JC11)
关键词
安全工程
指标气体
预测预报
临界温度
safety engineering
index gas
forecast and prediction
critical temperature
