Research On Optimization Of Flow Field Of Funnel Slag Removal Reactor For Special Steel Vacuum Pouring System

As the last reactor before the pouring of molten steel to the mold,the refining function of tundish has been paid attention.The Third Steelmaking Plant of Fushun Special Steel uses a funnel reactor to separate slag during the vacuum casting process in which the weir and the dam were installed.Because of the complicated flowing state of slag and molten steel,the molten steel in the reactor had not obtained a reasonable residence time,which caused some slag entering the mold cavity with molten steel affecting the quality of steel products.This study mainly focuses on the two-phase flow in funnel reactor and optimizes the internal structure of funnel reactor through physical model experiment.In order to deeply study the optimization of flow field of funnel slag removal reactor for special steel vacuum pouring system,the original single weir and dam structure is changed into two groups of weir and dam.There are two dams and single weir in the first group of weir and dam,and the first dam is considered as an equivalent turbulence controller.Analyzes the influence of various factors on the slag removal ability of funnel reactor by the test of conductivity measurement and the simulation experiment of water and oil.Then find out the solution to optimize the internal structure of the reactorThe experimental study finds that increasing the height of the equivalent turbulence controller can prolong the residence time of molten steel in the reactor,improve the metallurgical properties and optimize the capacity of slag removal of the reactor.Reducing the two distance from the bottom of two weirs to the bottom of the reactor can prolong the residence time of the molten steel and optimize the slag stopping capacity of the reactor.Increasing the height of the two dam can enhance the slag removal capacity of the reactor However,with the increase of the height of the dam the ability to optimize the fluid metallurgical characteristics gradually decreases and the excessive height of the dam will cause the disturbance of the surface of the liquid.Increasing the distance from the inner wall of the reactor to the weir can increase the average residence time of the molten steel,and optimize the slag removal capacity of the reactor.Reducing the distance between the equivalent turbulence controller and the weir has little effect on the average residence time and the ratio of dead zone in the reactor.But it will reduce the proportion of the plug-like zone in the reactor and increase the volume ratio of mixture zone,and optimize the metallurgical characteristics of the reactor improving the slag removal capacity of the funnel reactor.The reduction of the two distance between weirs and dams can both increase the average residence time of the molten steel and reduce the rate of dead zone in the reactor.The optimization of the metallurgical characteristics and the slag removal capacity of the funnel reactor is more obvious by reducing the distance between the second weir and the second dam.Increasing the distance between two weirs can prolong the residence time of the steel liquid in the reactor and improve the slag removal capacity of the reactor.In the first group of the weir and the dam combinations,the distance from the inner wall of the reactor to the weir has the largest influence on the residence time,followed by the height of the equivalent turbulence controller,followed by the height of the dam,followed by the distance between the weir and the dam,followed by the distance from the bottom of the weir to the bottom of the reactor,and the smallest one is the distance between the equivalent turbulence controller and the weir.So in order to change the average residence time of the reactor fluid,the research target should be focused on the distance from the inner wall of the reactor to the weir and the height of the dam and the equivalent turbulence controller.In the second group of weir and dam combinations,the height of the dam has the largest influence on the residence time,followed by the distance between the weir and the dam,followed by the distance between two weirs,and the smallest on is the distance from the bottom of the weir to the bottom of the reactor.So it can be known that in order to change the average residence time of the fluid in the reactor the research should be focused on the study of the height of the dam and the distance between the weir and the dam.