| The density and kinematic viscosity of waste oil and its biodiesel are higher than that of petrochemical diesel.When it is burned in an industrial furnace,the problem of difficulty in atomization of high-viscosity waste oil and its biodiesel is highlighted,and the quality of fuel atomization has a direct impact.Whether or not the ignition can be successful in the furnace,stable combustion,and whether it can meet the post-combustion emission standards.As a result,the study of the atomization mechanism of the waste oil and waste oil biodiesel and the optimization of the atomization quality of the waste oil and waste oil biodiesel have become the primary issues in promoting its practical and commercial use.This project studied the atomization characteristics of waste oil and its biodiesel industrial furnace.The Fluent was used to numerically simulate the biomass fuel atomization in the industrial furnace.Firstly,the biodiesel production of waste oil was studied in the laboratory by using the transesterification method.The physical and chemical properties of the atomization quality were examined by the use of waste oil and its biodiesel.Secondly,the theoretical value of the sound velocity,density and compressibility of the corresponding biodiesel for waste oil at 0.1-3.0MPa fuel pressure and 25-70°C fuel temperature are calculated.Finally,experimental verification of the simulation results was conducted through a laboratory-built visual atomization experiment system to provide data support and theoretical basis for the atomization of waste oil and its biodiesel in industrial furnaces.The main conclusions of the research in this paper are as follows:?1?From 25°C to 70°C,the kinematic viscosity of waste oil decreased by 73.8%and the surface tension decreased by 25.3%;while the kinematic viscosity of waste oil biodiesel decreased by 56.3%,the surface tension decreased by 13.2%;waste oil and its biodiesel The calorific value is10%12%lower than 0#diesel.?2?The sound velocity and density of waste oil biodiesel decrease with increasing temperature under isobaric conditions and increase with increasing pressure under isothermal conditions.?3?Under isobaric conditions,the compressibility?ks?increased from 0.599 GPa-1 to 0.802GPa-1,increased by 33.9%,the penetration of the oil in the trench oil was shortened by 5%,and the oil beam cross-sectional area increased by 7.0%.,The atomization cone angle increased by 10.6%;The penetration distance of waste oil biodiesel oil beam was shortened by 1.5%,the cross-sectional area of oil beam increased by 2.3%,and the atomization cone angle increased by 12.6%,the corresponding SMD with the compressibility changes the fitting formula is:?=18.76-24.354ks+14.0366)2??4?Under isothermal conditions,the compressibility increased from 0.589 GPa-1 to 0.599GPa-1,increased by 1.7%,the penetration distance of the oil in the trench oil was shortened by10.3%,the cross-sectional area of the oil beam increased by 4.5%,and the atomization cone The angle decreased by 27.7%;The penetration distance of waste oil biodiesel oil was shortened by12%,the oil beam cross-sectional area was increased by 1.6%,and the atomization cone angle was reduced by 26.9%. |
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