Study On The Basic Characteristics Of Bio-Aviation Kerosene

Bio-aviation kerosene prepared from bio-oil by pyrolysis and hydrogenation is similar to petroleum in structure.It can replace petrochemical aviation kerosene without changing the structure and flight mode of existing aircraft through specific chemical refining and conversion.The main research work of this paper is as follows:?1?Experiments were carried out to optimize the preparation parameters of bio-aviation kerosene.The column temperature,type and amount of cracking catalyst in bio-aviation kerosene catalytic pyrolysis-distillation process were determined,and the ratio of silicon to aluminium?SiO ₂/AlO ₃?and amount of HZSM-5 catalyst and the optimal reaction time were obtained in the molecular structure adjustment of bio-aviation kerosene.The results showed that the ratio of light oil to bio-aviation kerosene was the highest when Na₂CO₃ catalyst was added to soybean oil pyrolysis-distillation column at 300 C.The results show that the amount of HZSM-5 catalyst is 5 wt%and the ratio of silicon to aluminium?SiO₂/AlO₃?is 25 during aromatization.It is suitable to react for 4 hours at 350?.?2?The physical and chemical properties of bio-aviation kerosene and its atomization characteristics were studied.The test results show that the physical and chemical properties of bio-aviation kerosene are similar to RP-3 aviation kerosene,with high energy density and good application prospect,but the viscosity of bio-aviation kerosene(2.11mm².s^-1)is higher.The atomization characteristics of bio-aviation kerosene are mastered through the experimental study of atomization characteristics,and it is found that the average diameter SMD?Sauter Mean Diameter?of bio-aviation kerosene is larger than that of RP-3 aviation kerosene.Oil,and the distribution of bio-aviation kerosene larger particle size oil droplets proportion is higher,compared with RP-3 aviation kerosene to large particle size shift.?3?Research on numerical simulation,experimental verification and observation of bio-aviation kerosene swirl burner combustion was carried out.The results show that bio-aviation kerosene is not fully burned under high oil-gas ratio,and bright red and yellow flame columns appear.Increase the air volume,improve the combustion state,the flame is transparent blue,stable shape.The lean extinguishing limit?oil/gas ratio 0.0266?of bio-aviation kerosene swirl burner is lower than that of RP-3 aviation kerosene?0.0336?,which has great potential for lean combustion.The simulation results are consistent with the experimental results.?4?A comparative study on the application of bio-aviation kerosene and RP-3 aviation kerosene in piston aeroengine was carried out.The results show that the dynamic flow characteristics of bio-aviation kerosene pulse nozzle are similar to those of RP-3 aviation kerosene.In the bench test of bio-aviation kerosene piston engine,it is found that the thermal starting performance of the engine is better than that of RP-3 aviation kerosene,and the overall fuel consumption of the engine is close to that of RP-3 aviation kerosene.When using bio-aviation kerosene,the engine works unsteadily at high speed,and the combustion chamber has coking phenomenon.The physical and chemical properties,atomization and combustion of bio-aviation kerosene determine the storage,transportation and engine performance of bio-aviation kerosene.Therefore,it is of great significance to study the optimization of the preparation process parameters of bio-aviation kerosene and grasp the basic characteristics of bio-aviation kerosene for evaluating the feasibility of bio-aviation kerosene replacing Petrochemical aviation kerosene and ensuring the safe operation of aircraft.