Numerical Investigation of Desulfurization Kinetics in Gas-Stirred Ladles by a Quick Modeling Analysis Approach
| Autor: | April Pitts-Baggett, Qiulin Yu, Laurentiu Nastac, Qing Cao |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Ladle
Materials science business.industry Metals and Alloys Slag Thermodynamics 02 engineering and technology Computational fluid dynamics Condensed Matter Physics 020501 mining & metallurgy Flue-gas desulfurization Chemical kinetics 0205 materials engineering Mechanics of Materials visual_art Mass transfer Materials Chemistry visual_art.visual_art_medium Fluid dynamics business Refining (metallurgy) |
| Zdroj: | Metallurgical and Materials Transactions B. 49:988-1002 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-018-1234-7 |
| Popis: | A quick modeling analysis approach for predicting the slag-steel reaction and desulfurization kinetics in argon gas-stirred ladles has been developed in this study. The model consists of two uncoupled components: (i) a computational fluid dynamics (CFD) model for predicting the fluid flow and the characteristics of slag-steel interface, and (ii) a multicomponent reaction kinetics model for calculating the desulfurization evolution. The steel-slag interfacial area and mass transfer coefficients predicted by the CFD simulation are used as the processing data for the reaction model. Since the desulfurization predictions are uncoupled from the CFD simulation, the computational time of this uncoupled predictive approach is decreased by at least 100 times for each case study when compared with the CFD-reaction kinetics fully coupled model. The uncoupled modeling approach was validated by comparing the evolution of steel and slag compositions with the experimentally measured data during ladle metallurgical furnace (LMF) processing at Nucor Steel Tuscaloosa, Inc. Then, the validated approach was applied to investigate the effects of the initial steel and slag compositions, as well as different types of additions during the refining process on the desulfurization efficiency. The results revealed that the sulfur distribution ratio and the desulfurization reaction can be promoted by making Al and CaO additions during the refining process. It was also shown that by increasing the initial Al content in liquid steel, both Al oxidation and desulfurization rates rapidly increase. In addition, it was found that the variation of the initial Si content in steel has no significant influence on the desulfurization rate. Lastly, if the initial CaO content in slag is increased or the initial Al2O3 content is decreased in the fluid-slag compositional range, the desulfurization rate can be improved significantly during the LMF process. |
| Databáze: | OpenAIRE |
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