KINETIC MODEL OF DESULPHURIZATION FOR PRODUCTION OF ULTRA LOW SULPHUR NON GRAIN ORIENTED SILICON STEEL BY INJECTION OF FLUX POWDER IN RH DEGASSER
Desulphurization process by powder injection during production of ultra low carbon and ultra low sulphur silicon steel (C < 30 ppm and S < 30 ppm) on RH <br /> <br /> <br /> <br /> plant, shall be performed after decarburisation and deoxidation. Determination of sul...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/24771 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Desulphurization process by powder injection during production of ultra low carbon and ultra low sulphur silicon steel (C < 30 ppm and S < 30 ppm) on RH <br />
<br />
<br />
<br />
plant, shall be performed after decarburisation and deoxidation. Determination of sulphur distribution ratio in the slag formed by injected powder (Ls) and sulphide <br />
<br />
<br />
<br />
capasity (Cs), which was introduced by Sosinsky and Sommerville, are applied to predict the final sulphur content in molten steel. While kinetic desulphurisation <br />
<br />
<br />
<br />
model on RH plant by powder injection has been developed by Wei. In this study, the kinetic desulphurization rate constant is determined using the kinetics equation <br />
<br />
<br />
<br />
introduced by Wei. Furthermore, Deo's model is used to calculate the sulphur content in molten steel as function of time with respect to equilibrium sulfur <br />
<br />
<br />
<br />
concentration. Simulation results have been verified with several plant trial data from industries. This study shows that the combination of Wei's and Deo's <br />
<br />
<br />
<br />
kinetic model can be used to predict the decrement of sulphur content in a RH degasser conducted by powder injection through a lance. Simulation results show <br />
<br />
<br />
<br />
that the optimum amount of injected powder is in the range of 3 - 6 kg/ton of steel. The total desulphurisation treatment time will be 21-27 minutes at oxygen content less than 5 ppm. Such desulphurization condition may reduce the sulphur content in the molten steel from 70 ppm to less than 10 ppm with depent on the <br />
<br />
<br />
<br />
amount of injected flux the efficiency of processis ranging from 67 to 89%. |
|---|