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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 15b
SUMMARY:High-temperature blast operation in Kimitsu No.2 blast furnace
DESCRIPTION:The reduction of carbon dioxide emission is one of the most important issues in the steel industry due to the large CO2 emitter. The steel is mainly produced by reducing iron ore using a blast furnace (BF), and its reducing agent is mostly carbon. Therefore, a low Reducing Agent Ratio (RAR) operation of the blast furnace is one of the solutions for reducing CO2 emissions.
Kimitsu No.2 BF has been trying the low RAR operation by optimization of burden distribution, improvement of burden materials quality and so on.
To further reduction of the RAR, the high-temperature blast operation is suggested to be an effective improvement.
Because the high-temperature blast can raise an input amount of heat in the furnace, and it leads to the reduction of the RAR.
Before operating under the high-temperature blast, there were two considerations; i.e. the one was the evaluation of the RAR reduction, and the other was the upgrading the hot blast stove.
The reduction of RAR under the high-temperature blast operation was evaluated using a 2-dimensional mathematical model, and it was estimated that the RAR could be reduced below 490kg/t-p by 1300°C.
The original hot blast stove had a limitation at 1200°C due to a heat resistance of the checker brick bracket. Thus, the material of the checker brick bracket was replaced with a high heat-resistant one. This new material made it possible to raise the blast temperature over 1300°C.
The high-temperature operation was carried out in Kimitsu No.2 BF from 2019, and the RAR was able to be reduced to 492kg/t-p. This operating results were correlated well with the estimated value from the mathematical calculation.
CLASS:PUBLIC
DTSTART:20230615T111000
DTEND:20230615T113000
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