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对南宁褐煤在封闭体系和开放体系下开展了热模拟实验,并对其在2种热模拟体系下的氢气、气态烃和液态烃产率的演化特征以及相互关系进行了研究。结果表明,在煤岩热解生烃过程中,封闭体系下液态烃出现的温度区间为250~600℃,开放体系下液态烃出现的温度区间为250~550℃。通过氢气、气态烃和液态烃产率的对比分析,发现液态烃是影响有机质发生缩聚反应的主要因素。2种热模拟体系下,氢气和气态烃产率分别与液态烃产率呈负相关关系,而氢气和气态烃产率呈正相关关系,且三者的总演化趋势相同,说明有机质演化是一个稳定的过程,和自身化学键的键能密切相关。在高温阶段,2种热模拟体系下的气态烃产率基本相同,因此在计算生气量时,产气率数据的选择要考虑演化程度的影响。
The thermal simulation of Nanning lignite in a closed system and an open system was carried out. The evolution characteristics and correlations of hydrogen, gaseous hydrocarbons and liquid hydrocarbon yield under two kinds of thermal simulation systems were also studied. The results show that during the hydrocarbon generation from coal pyrolysis, the temperature range of liquid hydrocarbons in closed system is 250-600 ℃, and the temperature range of liquid hydrocarbons in open system is 250-550 ℃. Through the comparative analysis of the yields of hydrogen, gaseous hydrocarbons and liquid hydrocarbons, it is found that liquid hydrocarbons are the main factors affecting the polycondensation of organic matter. Under the two thermal simulation systems, the yields of hydrogen and gaseous hydrocarbons are negatively correlated with the yields of liquid hydrocarbons, while the yields of hydrogen and gaseous hydrocarbons are in a positive correlation, and the total evolution trends of the three are the same, indicating that the evolution of organic matter is stable The process, and its own chemical bond keys can be closely related. At high temperature, the yields of gaseous hydrocarbons under the two thermal simulation systems are basically the same. Therefore, in calculating the gas production, the selection of gas production data should consider the influence of evolution degree.