The Simulation Research Of Microporous Argon Blowing Technology In Tundish

The topic for the fine liquid steel less than 30 ?m of fine non-metallic inclusion removal rate is relatively low.A microporous argon blowing scheme for the permeable brick in the tundish is proposed.The method of numerical simulation and water model experiment is adopted.The flow characteristics of molten stee l and the movement of inclusions under the action of small bubbles are studied.We hope to further improve the purity of molten steel.The numerical and physical model results show that: the air blowing position does not affect the distribution of the flow field in the tundish,but it will affect the removal rate of the small inclusions when the tundish is carried out with a porous brick for argon blowing.When argon blowing is carried out downstream of the entrance dam,the removal rate of 5~35 ?m micro inclusions in the tundish is the largest.The removal rate of 5~15 ?m inclusion decreases with the increase of porosity,when the porosity is 10%,the inclusion removal efficiency is higher.When the inclusions become larger,the removal rate of 20~35 ?m inclusions increases with the increase of the porosity.When the porosity is 20%,the removal rate of inclusions is the highest.When the bubbles become large r,the removal rate of micro inclusions decreases and the removal rate of lager inclusions increases.When the particle size is larger than 30 ?m,20 ?m bubbles are larger than 2 ?m bubbles for the removal rate of inclusions.When the particle size is larger than 40 ?m,200 ?m bubbles are larger than 20 ?m bubbles for the removal rate of inclusions.In summary,the main role of micropore argon blowing technology in tundish is not to increase agitation,but to produce a large number of dispersed small bubbles without changing the flow field of the tundish,and to clean the liquid steel by inert bubbles.The reasonable selection of the position and porosity of the permeable brick can not only improve the removal rate of the micro inclusions,but also reduce the erosion of the molten steel on the permeable bricks in the process of industrial production,prolong the life of the tundish and reduce the production cost.