Abstract
In recent years, a lot of work on the development of oil shale has been done with regard to the Chinese oil shales. However, the research is mainly with respect to the processing aspects of oil shale. The pyrolysis mechanism of oil shale has been limited, to some extent, by instrumentation and analytical techniques. In this paper, pyrolysis kinetics characteristics of oil shale samples obtained from Mudanjiang were investigated by Rock-Eval analysis. The weight loss data, pyrolysis mechanism, and properties of oil shale were analyzed at different heating rates (10, 15, 20, 25, 30℃/min) in the temperature range from 200 to 600℃. In this paper, a distribution function of apparent activation energy and a relationship equation of apparent energy with frequency factor have been obtained. A special kinetic model was developed, fully suitable for the pyrolysis characteristics of oil shale. This model was also verified by experiment. Throughout the analysis of pyrolysis kinetics, it was observed that the pyrolysis reaction mechanism at different temperatures could be explained. The results may provide the theoretical basis for further effective and economical exploitation of oil shale.
Highlights
C DeaminationOil shale sample used in this work was obtained from Mudanjiang, China. It was ground and sieved to corresponding sizes for different uses
In recent years, a lot of work on the development of oil shale has been done with regard to the Chinese oil shales
A study on Mudanjiang oil shale in the Songliao Basin was carried out to investigate the effect of heating rate on the pyrolysis of oil shale by employing Rock-Eval technique
Summary
Oil shale sample used in this work was obtained from Mudanjiang, China. It was ground and sieved to corresponding sizes for different uses. The first stage is called the low-temperature weight loss step (stage 1), and it occurs in the range of room temperature to 200C It is mainly caused by the precipitation of internal water and the layer water of clay mineral. The Rock-Eval pyrolysis method has been widely used for oil and gas exploration in sedimentary basins all over the world This technique uses temperature programmed heating of a small amount of oil shale in an inert atmosphere (helium or nitrogen) in order to determine the quantity of free hydrocarbons present in the sample and of those that can be potentially released after pyrolysis.
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