基于Aspen Plus用户模型技术的油页岩热解过程模拟

Simulation of oil shale pyrolysis using Aspen Plus user model

建立了基于油页岩化学结构的热解动力学模型,利用Fortran语言对热解主要组分的数学模型进行编写,基于用户模型嵌入到Aspen Plus软件中,对主要组分产率随温度变化进行了模拟计算,并与文献实验数据进行对比。结果表明:CO和CH_4模拟值与实验数据吻合较好;CO_2的模拟值约在600℃之前有较好的契合度,由于模拟中未考虑矿物质分解,导致600℃之后有一定偏差;H2的产率曲线模拟值与文献实验值在开始阶段比较一致,随着时间的延长,偏离程度慢慢变大;550℃之前,页岩油的模拟值与文献实验值吻合程度较好,在高温段的预测有一定偏差。同时对不同温度下主要组分的产率随时间的变化预测发现:随着时间的延长,主要组分的产率先快速增加之后逐渐稳定在一个恒定值;温度较低时,主要组分的产率随着时间的延长而增加。当进一步提高热解温度,完成有机质分解所需要的时间逐渐缩短;在同一时间下,主要组分产率随热解温度的增加而升高。

It was used to build the oil shale pyrolysis model based on chemical structure,using Fortran language to compile mathematical model of the main components and embedding Aspen Plus based on user model.The main components of yield with the temperature change was simulated calculation.The accuracy of the results was verified by comparing document of the experimental data and simulation of the data.The results indicated that the simulation of the data for CO and CH_4 agreed well with document of the experimental data.The analogue value of CO_2 and shale oil had a good fit before about 600℃,while some deviations occurred after 600℃ due to the influence of decomposition of mineral substances.The simulation of the data for H_2 in the beginning stages had a good fit with document of the experimental data, but the deviation degree slowly enlarged as time went on.Meanwhile,the yield of main components with time under different temperature was forecasted,It was found that the yield of main components first increased rapidly and then gradually stabilized at a constant value with the extension of time.When the temperature was relatively low,the yield of main components increased as time went by.When the pyrolysis temperature was further enhanced,the time required for organic matter decomposition was gradually reduced.The yield of the main component increased with the raise of pyrolysis temperature at the same time.