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| Michalek K., Morávka J., Gryc K. |
| MODELLING OF TRANSFER PROCESSES IN GAS LADLE BUBBLING AND THEIR MATHEMATICAL IDENTIFICATION BY L-TRANSFORMATION |
Abstract
The article presents results of model investigation of bath behaviour in the ladle during its gas argon bubbling realised by two stir elements situated in the ladle bottom. Study was performed with use of physical modelling method on a scale model 1 to 10. The paper presents also our own experimental investigation results obtained from argon volumetric flow impact and influence of stir elements situating on the course of the concentration homogenisation process and change of flow characteristics in the pouring ladle model. The second stage was focused on evaluation of simultaneous bubbling through two stir elements in the ladle bottom and to propose the optimum location of the second SE in the ladle bottom. Development of homogenisation processes after bubbling start was evaluated on the basis of electrical conductivity and temperature change, which were measured at three points of the ladle volume by conductivity and temperature sensors. Executed works were realised for conditions of 180 t steel ladles.
The used models processed results of experimental investigation. Exact theoretical description of processes occurring at argon bubbling into steel would be very complex and it would lead to a system of non-linear partial differential equations describing transfer of momentum, heat, components, and with excitation function in the form of equation of so called deterministic chaos (argon bubbling). On the basis of pouring ladle model diagram and concentrations courses the simplified linear physically adequate model was proposed, which described behaviour of steel concentration in pouring ladle during its bubbling. Analysed process was understood in the form of a cybernetic model, which can be transparently visualised by so called block diagram.
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| Keywords: steel|ladle|gas argon bubbling|stir elements|physical modelling|mathematical identification| |
| No 2 (2008), p. 224-232 |
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