Study On Hydrogenation Reaction Compatibility Of Badaowan Coal With Heavy Oil

Coal-oil co-processing is a technology, which is coal and heavy oil common hydrogenation producing clean fuel oil. The heavy oil includes coal and oil industry distilled atmospheric resid, vacuum resid, FCC slurry oil, oil sands bitumen, coal tar and so on. The utilization rate of reactor is improved due to the co-processing hydrogenated conversion of heavy oil and coal. Not all heavy oil is suitable for co-processing hydrogenation because of the close relationship between hydrogenation effect and the nature of both coal and heavy oil. Therefore, the thesis studies the hydrogenation reaction compatibility of Badaowan coal with heavy oil, selects the more suitable heavy oil, explores the influence of compatibility factor and index, and presents the improvement measures.The paper is based on Badaowan coal and high temperature coal tar, coal tar in low-temperature>325℃ fraction, catalytic cracking slurry oil, atmospheric residuum and vacuum residuum as the research object. From the raw material composition, structure, properties and technological process of Badaowan coal and 5 kinds of heavy oil compatibility were studied by autoclave, normal temperature low viscosity meter, high temperature and high pressure viscosity meter as the main research methods.Towards Badaowan coal and 5 kinds of crude oil, we analyzeda series of routine analysis,1H-NMR analysis and thermogravimetric analysis, and got the basic composition, structure and properties characteristics of raw materials. Using normal temperature atmospheric pressure viscosity meter, high temperature and high pressure viscosity meter and density meter, we respectively explore rheological property and stability characteristics of the different ratio of coal-oil slurry. Different kinds of heavy oil were used in Coal-oil co-processing experiments to study the effect of heavy oil on the properties of Badaowan coal reaction. The product fractions were cut and each fraction properties changing was analysed. The synergistic effect was investigated by IR, NMR, liquid chromatography and GC-MS.The effect of coal tar pre-hydrogenation, the addition of hydrogen-donor solvent and coal pre-swelling on the co-processing reaction process was studied. The main conclusions were as follows:(1) Under atmospheric pressure normal temperature vacuum residuum and coal can’t be prepared, because of its high viscosity. However, high temperature coal tar, catalytic cracking slurry oil and atmospheric residuum can do, and coal-oil slurry appropriate concentration was 30%～40%. In heating process, the coal-oil slurry, high temperature coal tar as solvent, appears a peak viscosity, and It has been discovered that hot-melt products from coal and coal swelling is the result of joint action.(2) As compared to coal liquefaction with the optimal solvent, tetrahydronaphthalene, coal-oil co-processing owes some advantages:improving the reaction performance of coal, reducing the hydrogen consumption ande gas production rate, increasing oil production rate by 6-10%.(3) By analysising all kinds of influence factors, we obtained some compatibility indexes:density, moisture content, ash content, viscosity, H/C rate, aromatic carbon rate, reaction temperature, instability parameter, swelling degree.Viscosity and aromatic carbon rate are the two most important compatibility indicators.(4) Integrated all the compatibility results, we got the match order, as follows: high temperature coal tar, catalytic cracking slurry oil, coal tar in low-temperature> 325℃ fraction, atmospheric residuum and vacuum residuum.(5) Adding solvent for hydrogen (tetrahydronaphthalene or VGO) can play an important role in coal-oil co-processing, as follows:improving its performance for hydrogen, redusing asphalt production rate, making poor synergy vacuum residuum better and expanding the scope of application of heavy oil.