The Distribution Of Hydrocarbon Products In The Process Of Oil Shale Pyrolysis

Based on analysis of thermogravimetric experiments and infrared technology and TG-MS,three kinds of oil shale kerogen from three areas of the Chinese Jilin Huadian,Yanji Wangqing,Shandong Longkou was studied with the heating rate of 20 ? /min under the conditions of pyrolysis characteristics,functional structure and light gas evolution law.The results showed that the organic functional groups in the kerogen pyrolysis mainly within the range of 350—520?,at this stage the Huadian kerogen of mass loss was the largest.The biggest mass fraction of mass loss accounted for 86% of the total mass loss rate,which had the best genetic potential.In theprocess of the thermal decomposition,the first decomposition was oxygen containing functional group and aliphatic structure,followed by the aromatic hydrocarbon structure,and the low activation energy separated out first.The light gas CnHm,CH4,CO2 and CO showed the biggest peak during the process of thermal decomposition,precipitation mainly concentrated in the 400—550?,and peaked at about 500?,which was corresponding to the larger peak of thermogravimet curve at the same temperature range.In the process of kerogen pyrolysis of organic functional groups,subsection solution conformed to the law of pyrolysis kinetics parameters.Through the analysis of precipitation in the process of kerogen pyrolysis products of four kinds of typical hydrocarbon types and corresponding cumulative production with the changing rule of the thermal decomposition temperature,better judgment in the process of the oil shale pyrolysis hydrocarbon product distribution.In addition,in kerogen pyrolysis characteristics,for example,studied the shale kerogen pyrolysis characteristics and the content of aliphatic chain under different terminal temperature.The results showed that,aliphatic hydrocarbon areas show the absorption peak intensity gradually decrease and eventually disappear during the process of pyrolysis,the content of the aliphatic chain can reach 35.6%,With the temperature change presents two change trend of increase with the decrease of the first,the final close to zero;With the pyrolysis temperature increasing,aliphatic hydrocarbon molecules in kerogen branched degree increase,but the temperature is too high,rapidly and less branched;-CH2 and-CH3 absorption peak area ratio of the maximum is 7.06,at this point and DTG curves of peak value corresponding to thelargest,infer that aliphatic hydrocarbon molecules in kerogen branched degree of mineralization has a close relationship with the thermal decomposition rate of kerogen,the greater thermal decomposition rate and the greater aliphatic hydrocarbon molecules branched chain.By discussing the aliphatic hydrocarbon chain structure and aliphatic content,along with thechange of thermal decomposition temperature more clearly identified,the precipitation in the process of oil shale pyrolysis hydrocarbon products mostly from aliphatic structure decomposition.