Numerical Simulation Study of Different Operating Conditions on Dry Reprocessing High-temperature Molten Salt Centrifugal Pump
Numerical simulations are carried out to study the process of LiCl-KCl molten salt transported by high-temperature molten salt centrifugal pump for dry reprocessing of spent fuel under different operating conditions and physical parameters.Based on Fluent numerical simulation software,the standard k-εturbulence model is selected,and the coupled pressure and velocity are adopted by Coupled algorithm to compare the pump's variation of hydraulic performance and internal flow field.The results showed that the pressure and velocity distribution pattern of the internal flow field,and the direction of the external characteristic curve of the molten salt pump are consistent.Under the same flow conditions,the larger the speed,the greater the pump head and power.As the speed increases,the best efficiency point of the pump is shifted to the high flow conditions and the recommended speed range for dry reprocessing molten salt pump is 2750～3150 rpm.The pump head and efficiency decrease as the viscosity of the transported molten salt increases.As the density of the molten salt being transported increases,the power and efficiency of molten salt pump increases,the head of pump is irrelevant,and the effect of the change in viscosity of the molten salt on the pump performance is greater than the change in density.The paper could provide reference for the design of dry reprocessing high-temperature molten salt pump and improvement of working conditions.
dry reprocessing of spent fuelmolten salt pumpnumerical simulationoperating conditionsphysical parameters
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