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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Focke Wulf“
SUMMARY:Blast furnace thermal control reconsidered
DESCRIPTION:The blast furnace process is very variable, which is -among other things- manifest from large variability its thermal state: hot metal temperature and silicon content. So, at every operating blast furnace the thermal level is continuously controlled. However, when comparing blast furnace thermal control methods in various plants, there are large differences. 
Thermal control is analyzed from the perspective of the “melting capacity” of the bosh gas, that is the amount of heat available to melt the ferrous burden and slag in the lower part of the blast furnace. Since the major part of the heat requirement is used for driving direct reduction reactions and hydrogen is an efficient reducer at high temperature, the role of hydrogen in thermal control is discussed as well. 
A theoretical analysis is made to calculate the additional melting capacity that would be generated when coal rate is increased with and without an increase in oxygen enrichment to maintain flame temperature. This is applied to a real example of actions taken to prevent a blast furnace from severe cooling, and why these actions work, and to possible actions to take when coal rate is reduced due to supply problems whilst oxygen enrichment is maintained. 
Finally the importance of maintaining a minimum blast kinetic energy is discussed, along with the improvement made when tuyeres are clayed to maintain a minimum kinetic energy at low productivity.
CLASS:PUBLIC
DTSTART:20220630T165000
DTEND:20220630T171500
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