The Development Of Solvent Deasphalting Extraction Column Internals Worked With Heavy Oil

Solvent deasphalting is an important pretreatment process of heavy oil processing.Heavy oil such as residual oil is one of the most important raw materials in solvent deasphalting.Through the effect of solvent,metal which is difficult to transform and asphalt material are removed out,and deasphalted oil with better quality is used as the raw materials of catalytic processing.Extraction column is the essential equipment in the process of solvent deasphalting.In solvent deasphalting extraction column,different component placed into the column will have a certain impact on the characteristic of separation flow field.As a result,we need to improve the separation efficiency of extraction column by optimizing the internal components.A new type of liquid-liquid extraction internals is created in this paper.The method of Computational Fluid Dynamics(CFD) is used to simulate the hydrodynamics behavior of the extraction column,and the flow behavior of liquid-liquid two-phase is specially studied in the solvent deasphalting extraction column.By CFD simulation,we gain many quantitative and qualitative data of the solvent deasphalting extraction column.Except for oil and water,deasphalted oil and liquid propane are also used as two phase in separation in this paper.Through distribution and velocity vector picture,we have analyzed the hydrodynamics behavior of the extraction column and its internals.At the same time,we set a number of single variable,and we change the feed of flow rate,the outlet pressure of the extraction column and the structure of internals to analyze the effect of different condition on separation efficiency.According to the phase distribution and the flow behavior of each region in the extraction column,we can see that the extraction tower is in good condition.According to the phase distribution and the flow behavior of the same tray and different trays in the extraction column internals,we can see that the separation effect of extraction column internals is obvious. In a certain range of flow rates,the bigger the tower bottom outlet pressure is,the higher the separation efficiency of oil is,and the lower the separation efficiency of water is.At the same time,the larger the feed flow is,the higher the separation efficiency of water is,and the lower the separation efficiency of oil is. What is more,there is a proper range of the outlet pressure and flow rate,and we can always find the appropriate outlet pressure and flow rate according to the requirements of separation.In the area of extraction column internals,through changing the height of the vertical baffle and that of the vertical baffle gap,we can see that there is a proper range of the internals,and it is not conducive to phase separation no matter the internals are too big or too small.It is the first time to study this new type of extraction column internals in this paper,which offers much qualitative or quantitative data and operation experience for the research and experimental analysis of extraction column internals in the future.I hope that this extraction column internals will have a bright future.