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Fundamental Mathematical Model for AOD Process. Part I: Derivation of the Model
Author(s) -
Järvinen Mika P.,
Pisilä Sauli,
Kärnä Aki,
Ikäheimonen Topi,
Kupari Pentti,
Fabritius Timo
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201000265
Subject(s) - continuous stirred tank reactor , process (computing) , slag (welding) , plume , conservation of mass , flow (mathematics) , mass transfer , mechanics , plug flow reactor model , plug flow , process engineering , volumetric flow rate , component (thermodynamics) , scale (ratio) , gas composition , computer science , mechanical engineering , thermodynamics , engineering , physics , chemical engineering , operating system , quantum mechanics
This paper presents a new simulation model for the AOD process that takes the local variations into account but is still computationally efficient. The new idea here was to model AOD reactor as a combination of a plug flow reactor for the plume zone and a continuously stirred tank reactor (CSTR) for the bath and surface slag. This approach adopted has many advantages compared with the previous models. At first, it offers an effective method for considering the locally varying conditions as the gas bubbles rise in the plume. The model can be built computationally very effective compared to CFD due to significantly smaller amount of variables. The validation of the model is also easier as it has features that can be experimentally determined. The model is based on the simultaneous solution of conservation equations of mass, species and energy in all the vertical cells of the plug flow reactor, and a single volume in bath and surface slag. A novel method was developed and used for solving the rates in a mass transfer controlled multi‐component reaction system. In this Part I of this paper, the model is presented and its features discussed by few illustrative examples. In the following Part II, the model is broadly validated with new full scale industrial AOD process measurements for carbon release rate, melt composition, slag composition and bath temperature rise during final stages of carbon removal.