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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。
In the course of spontaneous combustion of coal, different gases are sequentially released according to different oxidation processes. The appearance and release of these gases can reflect the degree of spontaneous combustion of coal. In order to accurately predict the spontaneous combustion of No.2 well in Narin River, the spontaneous combustion oxidation characteristics of 3-1 coal and the change of the temperature of the oxidation gas and hydrocarbon gas during the spontaneous combustion were studied by a programmed temperature test apparatus and gas chromatograph. Regularity, the curves of alkene ratio and paraffin ratio such as φ (C2H4) / φ (C2H6), φ (C3H8) / φ (C2H6) were analyzed. The results show that the critical coal spontaneous combustion temperature of 3-1 coal in Nailing No.2 well is about 60 ℃, and the critical temperature of dry cracking is about 105 ℃. 3-1 coal can generate CO at normal temperature, and the yield is exponential with temperature ; The temperature of C2H4 appears is 65 ℃, the quantity of gas appears monotonous increasing trend after the temperature is higher than 120 ℃. Combining with the general principle of index gas, it is determined that the index gas of 3-1 coal seam spontaneous combustion of No.2 Well Nailing River should be dominated by C2H4 and CO, with C3H8, φ (C2H4) / φ (C3H8) as the supplement.