Mathematical And Physical Simulation For The Decarburization Process Of Single Snorkel RH

The decarburization process of single snorkel RH is a complex metallurgical process,which involves multiphase flow,mass transfer and a series of chemical reactions.In order to improve the efficiency of refining process and deduce refining time and carbon concentration at the end-point of decarburization in actual production,it is necessary to investigate the factors that affect the efficiency of the refining process.By mathematical simulation based on Eulerian-Eulerian two-fluid model and physical simulation based on metallurgical reaction dynamics,this paper focused on the decarburization efficiency of single snorkel RH on the condition of different lift gas flow rates,different top lance levels,different vacuum degrees,different top blowing gas flow rates and different initial carbon concentration,which would provide some advice for actual production.At the same time,the single snorkel RH was compared with traditional RH to figure out the differences between them in decarburization process.The main contents and conclusions of this dissertation are as follows:?1?Based on the steady-state flow field,numerical simulation was applied to investigate the unsteady state decarburization process of single snorkel RH.The decarburization efficiency kept constant when the flow rate of lifting gas reached 1200NL/min,the slope of decarburization curve for single snorkel increased with the increase of vacuum degree.Thus,the vacuum degree is the key factor to affect decarburization.Compared with 400ppm initial C concentration in traditional RH,500ppm initial C concentration in single snorkel RH can be in this way,decarburization is not a heavy load for converter.The decarburization efficiency of single snorkel RH is 27%greater than traditional RH at the same technological parameters.?2?By water modeling of NaOH-CO₂ reaction system,the oxygen absorption,decarburization and degassing processes in single snorkel refining process were simulated on a 1:5 water modeling based on the similarity theory.The experimental data of reaction dynamics about absorption and desorption of CO₂ showed the effects of different parameters on the oxygen absorption and decarburization processes.As the results showed,the rates of oxygen absorption and decarburization first increase then keep constant with increase of flow rates of lifting gas and top blowing gas.With increase of heights of top lance and vacuum degrees,the decarburization rates increase first and then decrease.There is a optimal value.The mass transfer coefficient of single snorkel RH is 35%greater than that of traditional RH.For single snorkel RH,the mass transfer coefficient for double nozzles is 6%greater than that of single nozzle.For traditional RH,the mass transfer coefficient for side-bottom blowing is 9%greater than that of side blowing in.