As one of the key equipment used in petrochemical industry,the valve can adjust the liquid flow by adjusting the opening.In the field of multiphase flow separation,the valve installed at the upstream of the separator is easy to cause shear fracture of dispersed phase,forming more small droplets,or even emulsification,which increases the separation difficulty.This work focuses on the low shear valve to reduce the droplet fragmentation.Starting from the analysis of key physical factors including the mean energy dissipation rate per unit mass and the liquid volume involved in energy dissipation,which affect the droplet fragmentation and the maximum stable droplet diameter,this paper summarizes the feasible paths to reduce the droplet fragmentation,including reducing the flow turbulence inside the valve,increasing the droplet coalescence structure,and increasing the liquid volume involved in energy dissipation.On this basis,the structural characteristics and actual performance of typical low shear valves are analyzed,and the development trends of low shear valves are summarized.The analysis results can provide theoretical and technical support for the development,optimization design,promotion and application of low shear valve.
维普
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