Tongchuan Separate Oil Shale Pyrolysis And Co-pyrolysis Of Their Properties

Oil shale is a kind of high ash content of sedimentary rocks which contain flammable organic matter. Oil shale can be converted into shale oil by retorting, which is similar to natural oil. Oil shale belongs to non-conventional resources, strengthen the development and utilization of oil shale, can solve the shortage of domestic oil brings obstacles for social development and economic construction, can reduce our country’s foreign oil dependency, can effectively avoid the country’s energy crisis. This article comprehensively studies the foundation properties, structural characteristics as well as pyrolytic properties from Tongchuan oil shale.By elemental analysis, industry analysis, and ash composition analysis can be drawn, Tongchuan oil shale is a kind of high ash, high hydrogen, high oxygen mixture of ash components mainly for SiO2, A12O3, Fe2O3; FTIR analysis of functional structure, aliphatic hydrocarbons, aromatic hydrocarbons and hydroxyl absorption in the characteristic absorption peak, minerals peak is relatively obvious, combined with XRD analysis of crystal structure, oil shale contains a lot of minerals, mainly for the quartz and clay minerals content of kaolinite, illite, montmorillonite and calcite, etc; oil shale adsorption isotherm is basically showing anti-S type, which is belong to the type II adsorption curve. Oil shale pore structure is mesoporous greater than4nm.Analysed composition of Tongchuan shale oil from Gray-King Assay with GC/MS, the shale oil mainly contained aliphatic hydrocarbon, an amount of up to55.63%, the aromatic content of33.91%, and oxygen-containing compound content of10.46%.Studied the characteristics of Tongchuan oil shale pyrolysis using TG-FTIR, were investigated the effect of heating rate, reaction atmosphere and the mineral on Tongchuan oil shale pyrolysis. In addition, studied the co-pyrolysis characteristics of oil shale with Fugu coal, shale char. Oil shale pyrolysis process could be divided into three stages, and the total weight loss rate was about15.5%. Pyrolysis gaseous products were mainly CO, CO2, CH4, aliphatic hydrocarbons, aromatic hydrocarbons and H2O. Different heating rates corresponding to the total weight loss of oil shale were basically the same. With the increase of heating rate, the maximum weight loss rate corresponding to pyrolysis temperature has increased, and the peak width of weight loss has widened. In the study of the temperature gradient range, with the heating rate increases, the amount of pyrolysis products has increased and the escape of pyrolysis products showed some lag. HyPy conversion was14.12%, a relative increase of9.4%compared with12.91%under pure nitrogen. Compared with the pyrolysis conversion rate38.34%of oil shale OS, the pyrolysis conversion rate of OS-SF and OS-CSF were increased,60.32%and48.06%respectively, while the pyrolysis conversion rate of OS-CF significantly lower, only20.21%. Within the investigated blend ratio gradient, with Fugu coal blending ratio increases, pyrolysis conversion rate increased to23.79%from16.43%, the pyrolysis rate increases was also evident, the same to escaping law of pyrolysis products. With shale char blending ratio increases, pyrolysis temperature range tended to narrow, and the co-pyrolysis mass loss rate has increased over the shale char pyrolysis alone, the TGA rate of shale char was0.0015/min, while the TGA rate of oil shale and shale char mixed with5:5was0.0018/min, pyrolysis mass loss rate increased by20%.In the small-scale fixed-bed reactor, investigated the changes of oil production rate and water production rate in the pyrolysis process of oil shale and Fugu coal. Within the selected mixing ratio range, the actual experimental oil production rates were higher than the calculated. When the blended percentage of Fugu coal was20%, the actual oil production reached its maximum8.02%, far higher than the calculated6.52%. The actual water production rates were less than the calculated, and the lower water production rate the higher oil production rate in blending.Using Coats-Redfern model to determine the pyrolysis reaction parameters, Tongchuan oil shale pyrolysis was a first order kinetics reaction, and the average activation energy was35.08kJ/mol. Tongchuan oil shale and Fugu coal co-pyrolysis were also a first order kinetics. With the increase of Fugu coal blending ratio, the co-pyrolysis reaction activation energy tended to decrease, and the co-pyrolysis reaction activation were lower than the activation energy of oil shale pyrolysis alone.