Process Optimization Study Of 120 Tons Of RH Refining Furnace

Since the development of RH refining equipment,its develops rapidly.RH is one of the important means to improve product quality,expanding product varieties and improving the value-added products.RH refining effect is achieved by the molten steel circulated between the vacuum chamber and the ladle,but also with the ladle flow distribution is closely related.A metallurgical enterprise with an annual output of 4.3million tons of steel,the main varieties of steel and marine steel,boiler pressure vessel steel,wear-resistant tool steel,pipeline nuclear energy steel,etc.he proportion of varieties of steel to 80% or more,RH refining only 10%.Therefore,it is important to study characteristics of RH process and fluid flow,mixing and mass transfer in ladle.In this paper,the flow,mixing and mass transfer characteristics of molten steel in RH and ladle are systematically studied by means of physical simulation research,which can provide guidance for the development of equipment potential and process optimization.In this paper,a 1: 3 physical model was established with 120 tons of RH as a prototype.The air supply,the depth of the impregnation pipe,the bubble stroke,the blow hole arrangement,the shape of the dip tube and so on were analyzed for RH circulation flow and mixing time.And the influence of the number of ladle blow holes and the arrangement on the mixing characteristics of the fluid in the ladle.The main conclusions are as follows:(1)By investigating the influence of different blowing holes on the refining efficiency,it is concluded that the mixing time is the shortest and the circulation flow is the shortest when blow hole layout for the upper and lower two symmetrical layout.Compared with the current working conditions,the circulation flow increased by45.479% and the mixing time decreased by 14.4%.(2)In different arrangements,oval-shaped dip tube mixing time is better than circular dipping tube.When the circulation flow is maximum,the corresponding mixing time is not necessarily minimum.(3)The relationship between the circulating flow rate(Q),the mixing time(T)and the driving gas flow rate(G),the depth of the pipe insertion(H),the bubble stroke(H)and other factors were obtained by multiple linear regression.For Q=10-3.22311·G0.73045·S0.8214·H0.87561,TR=106.8181·G-.065952·S-1.2322·H-0.71549,TO=10-0.86126G-0.56533·S1.46105·H-0.48891(4)In ladle bottom argon argon refining process,taking double hole 0.6R180°arrangement makes the refining effect best.The mixing time is lower than the original working conditions by 46.41%.