Vacuum Residue Oil Pump Simulation Research And Application

Residual Oil Pump,as the important service in refining equipment,conveys high-temperature residual oil.Therefore,higher requirement for cavitation resistance and structural design of the pump has been raised.Because of the severe working condition,the products are usually imported from foreign countries.And the optimum design for higher cavitation resistance and better performance in conveying high-temperature medium is important to realize the localization of the pump,break the foreign monopoly,decrease the cost of manufacture and maintenance,and promote the development of national economy.Taking sinopec hainan petrochemical co.,LTD refining unit of a certain type of high temperature and vacuum residue oil pump as the research object,optimize and design the structure of the pump and to improve its resistance to cavitation performance.This paper by using the ZE series process pump structure,By using single-stage support structure and cavitation theory in hydraulic design,and many design ways to optimally design for cavitation resistance in impeller,we get two series of impeller models.Then we use traditional methods by experience to get pump casing,and assemble those to two hydraulic models.By using Pro/E to 3-d model,and ICEM-CFD to divide the grids of flow field,then using CFX to numerically simulate the internal flow field of two models in three working conditions and predict the cavitation performance,we get one hydraulic model with the best cavitation performance.In this paper,using the Workbench of the adaptive grid technology automatic dividing machine 3 d model of the grid.According to the high temperature process pump in the practical application of the working characteristics of applied load in the pump inlet and outlet flanges,and overheating-solid coupling analysis.At 250 ℃ and 300 ℃ respectively by the model of stress and strain are analyzed,it is concluded that the deformation law of heat pump body and pump cover parts,and through the calculation and compare the safety allowable stress of material value,verify the design satisfies the requirement of working condition.Because the ring gap would influence the pump efficiency and change the flowing condition inside the centrifugal pump,even change the radial force and axial force of the rotors.We should optimize the structure of the ring gap of optimized hydraulic models.In thispaper,we use ANSYS Workbench to realize the finite element analysis of thermo-mechanical coupling of the pump.In the working condition of 200℃,250℃ and 300℃,we use thermo-mechanical coupling analysis to research for the temperature influence to the stress and the strain of the body and the cover,and to research for the deformation of the ring in different temperature and the change of the gap between the impeller ring and the body ring,which could help us to choose the ring gap reasonably.The related experimental results show that the residue oil pumps are excellent.