摘要
为探讨煤成气的生成特征和演化规律 ,对两种不同有机质类型煤进行了加水热模拟生气实验研究。认为 ,有机质类型对于煤的热模拟气生成特征和烃气产率有决定作用。非烃气中的氢气、一氧化碳与二氧化碳含量之间呈负相关 ,这与水参与反应有关。甲烷的形成与水的作用关系密切。不同的热模拟气在成熟 -高成熟演化阶段差异明显 ,有机质类型越差 ,热模拟气中甲烷相对越多 ,干燥系数相对越大 ,异丁烷 /正丁烷越高 ;反之 ,甲烷相对越少 ,干燥系数越小 ,异丁烷 /正丁烷低 ,区别越明显。演化程度增加时 ,热模拟气之间的差别减小。总烃气和甲烷的产率随温度升高而增加 ,而重烃有产率高峰存在 。
In this paper, the thermally simulative gas from two types of coal was analyzed by hydropyrolysis and their gas-generating features and evolution rules are discussed. It is indicated that the type of organic matter plays an important role in controlling the thermally simulative gas composition and the yield of hydrocarbon gas. The involvement of water in reaction is closely related to the negative correlation between CO and CO2. The formation of methane is intimately related to the involvement of water. At the mature and highly mature stages, there is a significant difference among various thermally modeling gases, i.e., the worse the type of organic mater type, the more the methane will be formed, the higher the drying coefficient and the bigger the ratio of isobutane to normal butane, and viseversa. At the higher evolution stage, the differences between various simulative gases are reduced, the yield of total hydrocarbon gas and methane increases with the rise of temperature, and the peak yield of heavy hydrocarbons is just corresponding to the bottom of the oil-generating window.
出处
《地质地球化学》
CSCD
2003年第1期92-96,共5页
Geology-Geochemistry
基金
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关键词
煤成气
有机质
一氧化碳
二氧化碳
干燥系数
甲烷
thermally simulative gas
type of organic matter
evolution stage
drying coefficient
