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通过煤二次生烃作用程序热解模拟 ,详细描述了煤二次生烃作用主要参数如瞬时生烃率、累积生烃率、累积生烃量、降解率和残余碳的变化。随原始煤化程度的不同 ,子样二次热解峰温出现滞后、提前和固定的多程式变化。中期热解成烃阶段的煤 ,弱化学键和沥青化物质的存在导致成烃反应温度区间向低温方向扩展 ,二次生烃作用起步更快。早、晚期热解成烃阶段的煤 ,成烃反应主要依赖于煤主体结构的热解 ,二次生烃作用的激活需要达到或超过此前的成烃反应条件。煤的二次生烃潜力是由初次成烃演化程度所限定。根据煤二次生烃作用阶段性特点及煤层气的自生自储特性 ,生烃高峰期 ( Ro,m 0 .95 % )前叠加变质作用最利于煤的产气潜力的发挥。
Through the pyrolysis simulation of coal secondary hydrocarbon generation process, the main parameters of coal secondary hydrocarbon generation such as instantaneous hydrocarbon generation rate, cumulative hydrocarbon generation rate, cumulative hydrocarbon generation rate, degradation rate and residual carbon change were described in detail. With the different degree of the original coalification, sub-sample pyrolysis peak temperature appears lag, advance and fixed multi-program changes. Due to the existence of coal, weak chemical bonds and bitumen in the intermediate stage of pyrolysis and hydrocarbon formation, the hydrocarbon generation reaction temperature range extends to low temperature, and the secondary hydrocarbon generation starts more rapidly. In the early and late stages of pyrolysis and hydrocarbon generation, the hydrocarbon generation reaction relies mainly on the pyrolysis of the main structure of coal. The activation of secondary hydrocarbon generation needs to meet or exceed the previous hydrocarbon generation reaction conditions. Secondary hydrocarbon generation potential of coal is limited by the degree of initial hydrocarbon evolution. According to the stage characteristics of coal secondary hydrocarbon generation and the self-storage and self-storage of CBM, the superimposition and metamorphism before the peak of hydrocarbon generation (Ro, m 0 .95%) is most beneficial to the gas production potential of coal.