Study On Pyrolysis-hydrogenation Catalytic Preparation Of Aero Kerosene Component Oil From Pine And Poplar

With the progress of human civilization,human dependence on energy increases.Fossil energy is the main source of energy for mankind,and because fossil energy is non-renewable energy,Greenhouse Effect is getting worse and worse,which urges mankind to urgently need a kind of hydrocarbon fuel with environmental protection and renewability.Bio-oil is a kind of green,environmentally friendly and renewable fuel oil which is converted from lignocellulosic biomass into a kind of green,environmentally friendly and renewable fuel oil.The bio-oil is treated by hydrodeoxidization.Turn it into high-quality fuel oil.Based on the previous research results of the research group,this paper attempts to use lignocellulosic biomass as raw material and convert it into bio-pyrolysis oil by pyrolysis at high temperature and high pressure.By comparing the properties of bio-pyrolytic oils produced from different raw materials,comparative experiments and further kinetic analysis were carried out.In order to improve the quality of bio-oil,the bio-pyrolysis oil was treated by catalytic hydrogenation in a micro catalytic fixed reaction bed at high temperature and high pressure to reduce the oxygen content in bio-oil.The main research contents and conclusions are as follows:The effects of particle size,reaction temperature and water content of the two kinds of raw materials on the oil yield were studied by using pine wood and poplar wood as raw materials for pyrolysis oil.At the same time,the relationship between the density and kinematic viscosity of pyrolysis oil produced at different reaction temperatures was also investigated.When the particle size of the two kinds of raw materials is in 0.6mm,the oil yield of pyrolysis oil is the highest,55.02%?pine?and51.44%?poplar?,respectively.The oil yield of pine and poplar pyrolysis oil was57.02%and 52.44%,respectively,at the optimum reaction temperature of530?.The higher the moisture content of the pyrolytic oil,the higher the oil yield.The density of pyrolysis oil produced under different reaction conditions did not change much.Furthermore,the thermogravimetric analysis experiments of pine and poplar were carried out respectively.It can be obtained from the TG,DTG curve that the pyrolysis characteristics of pine and poplar are not different.The pyrolysis reaction took place between 200?and 450?.The pyrolysis temperatures of poplar and pine were 361?and 358?,respectively.According to the fitting of the Coast-Redfern integral method.The average activation energies of poplar and pine at low temperature were 89.34 kJ/mol and 86.66 kJ/mol,respectively.The deoxidization of pine pyrolysis oil was carried out in a micro fixed catalytic fluidized bed at high temperature and high pressure.The deoxidization oil was compared with biological oil.Catalytic hydrogenation experiments were carried out in a micro-fixed catalytic fluidized bed at high temperature and high pressure using deoxidization oil as raw material and Pt/SPAO-11 as catalyst.The optimum reaction conditions for the conversion of deoxidization oil to high quality hydrocarbon fuels are as follows:The reaction temperature is 400?,the hydrogen pressure is 10 MPA,the space velocity is 1.4 h/1,and the hydrogen-oil ratio is 1200.On the premise of single factor experiment,the selectivity of C₈^C₁₆6 hydrocarbon is taken as the index.The reaction temperature,hydrogen pressure and space velocity were selected to optimize the response surface.The optimal process conditions are as follows:The reaction temperature is 403.92?,the hydrogen pressure is 10.13 MPA,the space velocity is 1.39 h/1,and the selectivity of C8-C16 hydrocarbon is 49.70%.Under these conditions,the results show that the selection of C₈^C₁₆6 hydrocarbon is 48.73%,which is close to the predicted value.In order to further explore the reaction process and the reaction principle of the hydrodeoxygenation of the biological pyrolysis oil,the hydrocarbon is modeled and calculated by using the molecular simulation software?Materials Studio?.Taking C₅H₁₂2 as the target,the possible reaction paths are assumed,and the corresponding activation energies are calculated by modeling.According to the size of the activation energies required for each reaction path,the possible reaction paths are obtained by comparing and analyzing the possible reaction paths.