压力条件对龙口油页岩热解特性的影响

发布时间：2018-11-10 14:35

【摘要】：采用法国Setaram公司Themys HP型高压热重仪对我国龙口油页岩进行不同压力条件下的热解实验,利用产物释放特性指数,并通过分布活化能模型DAEM对不同压力条件下的热解反应进行动力学分析。研究表明龙口油页岩的热解主要包括页岩的脱水阶段、有机质热解阶段以及碳酸盐及黏土矿物的分解阶段;压力的升高对于龙口油页岩的热解过程有明显的影响,改变热解产物的析出速率,产物释放特性指数能很好地表征龙口油页岩在压力改变的条件下热解过程中产物的析出特性,热解压力小范围的升高(5bar)有利于挥发分的析出,过高的压力不利于挥发分的快速析出。动力学分析表明,热解低温阶段反应所需活化能在压力升高的条件下呈现出先增大后减小的趋势,但明显高于高温段热解活化能。适当提高压力有利于热解反应的进行。
[Abstract]:The pyrolysis experiments of Longkou oil shale in China under different pressure conditions were carried out by using Themys HP high-pressure thermogravimeter of Setaram company of France, and the characteristic index of product release was used. The kinetic analysis of pyrolysis under different pressure conditions was carried out by distributed activation energy model (DAEM). The results show that the pyrolysis of Longkou oil shale mainly includes the dehydration stage of shale, the pyrolysis stage of organic matter and the decomposition stage of carbonate and clay minerals. The increase of pressure has an obvious effect on the pyrolysis process of Longkou oil shale. Changing the precipitation rate of pyrolytic products, the characteristic index of product release can well characterize the precipitation characteristics of the products in the pyrolysis process of Longkou oil shale under the condition of pressure change. The increase of pyrolysis pressure in a small range (5bar) is beneficial to the precipitation of volatile matter, but too high pressure is not conducive to the rapid precipitation of volatile matter. The kinetic analysis shows that the activation energy of pyrolysis at low temperature stage increases first and then decreases under the condition of increasing pressure, but it is obviously higher than the activation energy of pyrolysis at high temperature. Properly increasing the pressure is beneficial to the pyrolysis reaction.
【作者单位】：东北电力大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51276034)
【分类号】：TE662

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