Parameter Optimization In The Process Of Gushing Deslagging

Desulphurization of molten iron after treatment,resulting in a large number of high-sulfur slag floating in the molten iron level,both occupy the molten iron capacity,but also prone to"resulfurization",must enter the next process to remove,often referred to as slag.Commonly used slag removal method is mechanical slag removal method,using slag removal plate or slag removal plate repeatedly slag,iron loss,low efficiency.In recent years,a surging slag removal process with blowing and mechanical slag removal has been applied in production with the advantages of high slag removal efficiency,low iron loss and low cost.However,the research on this process mostly stays in the simple research based on the laboratory and the experience accumulation of the enterprise,lacking theoretical support.In this thesis,the 125 t hot metal ladle of a domestic iron and steel enterprise is taken as the research object.On the basis of laboratory research,combined with multiphase flow numerical analysis,the slag skimming process is simulated and analyzed,and the process parameter optimization scheme with practical guiding significance is proposed,which provides theoretical support and parameter optimization guidance for the popularization and application of the surge slag skimming process.According to the principle of geometric similarity,a 1:5 water model was established in the laboratory.Through water simulation test and Fluent numerical simulation,the slag removal mechanism of the surging slag removal process was proved,and the results were analyzed and compared to verify the effectiveness of the numerical simulation.Through the study of the model test results and numerical simulation of the surge slag water model,the test results of the water model and the calculation simulation data are compared and analyzed,and it is determined that the two have good consistency.Numerical simulation can also provide a basis for real industrial production.A three-dimensional mathematical model of hot metal-slag-air flow in 125 t ladle was established.The effects of process parameters such as gas flow rate,insertion depth,insertion position and slag layer thickness on slag removal effect and liquid level fluctuation were systematically investigated.In the study of numerical simulation of surge deslagging process,considering the influence of various process parameters on the area,length,width and liquid level fluctuation height of the non-slag layer,it is concluded that when the air flow rate of the spray gun is about300 m~3/h,a better slag removal effect can be achieved;When the insertion depth of the spray gun is 800～1000 mm,it meets the condition of gushing without splashing,which is most conducive to slag skimming;When the insertion position of the spray gun is about 0.4P,the slag removal effect is the best,which is most conducive to slag removal.The optimum process parameters are different under different slag layer thicknesses.To achieve the best slag effect,it is very important to explore the optimum process parameters under different slag layer thicknesses.After correction and conversion,it is determined that the optimal injection gas flow rate in industrial production is about 100 Nm~3/h,and the optimal injection gun insertion depth range is800～1000 mm.When the injection gun is inserted at a distance of 600～700 mm away from the rear wall,it can achieve the best slag driving effect,improve the efficiency of slag skimming,provide a theoretical basis for the actual industrial production of hot metal slag skimming,and ensure the stable production of low-sulfur steel in iron and steel companies.