Study On The Dynamics Peculiarity Of Gasoline Blending In The Process Of Rotatry Jet Mixing

Petroleum processing industry which is called petroleum refining industry plays a significant role in China's national economy. In this industry, gasoline is not only a staple product, but also an important symbol to weigh the advanced level of manufacturing technique. As the last working procedure of gasoline production, gasoline blending plays a prominent role on the quality of processed oil and economic benefit of enterprises. However, the main existing method of gasoline blending has fault of dead zones, longer mixing time, more power consumption and higher maintenance. Under the national policy of energy-saving and emission-reduction, it is a very important practical and long-term significance to develop the new type of environment-friendly and energy-saving gasoline mixing system for sustainable development.Firstly, aiming at the background of gasoline blending tank with 5000m3, the project combines with international research achievements of advanced jet mixing system for sludge sedimentation prevention, calculating the important hydraulic parameters of Rotatry Jet Mixing system for gasoline blending with turbulent jet diffuse equations and mass transfer discipline. With empirical equations, the paper finishes the design of nozzles and pipelines of the system, and defines the lectotype of circulating pump.Secondly, using the theory of similarity principle and dimensional analysis, contractible gasoline tank and RJM geometry model are established. Based on the established three-dimensional gasoline components mixture model, the paper analyzes the mixing process of flow field with different nozzle angles and rotational speeds. Through the research of change law in dynamics peculiarity, such as contours of velocity magnitude, attenuation curve of dynamic pressure and distribution curve of axial velocity. The paper gets density-mixing time curve of different system layouts. The mixing effects are also compared.Thirdly, under the same working condition, major parameters and mounting arrangement are defined. In the same contractible gasoline tank, the numerical simulation model of traditional side-entering agitators is built and the mixing effects of multiphase flow field are analyzed. The simulation results are comparied with optimal mixing model of RJM system.Finally, the paper discusses turbulent jet theory and multiphase mixing theory for RJM, which is helpful to instruct series application of RJM system for gasoline blending.