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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 15a
SUMMARY:Development of blast furnaces blow-in technology for 100 years
DESCRIPTION:For the last 100 years, trends and classification of blast furnaces blow-in have been discussed. Development of blow-in subdivided into 3 periods: 1st - continued until end of 30s of XX century, characterized by lack of scientific knowledge, mysticism and based on previous experiences; 2nd - until the beginning of 70s, when "traditional" blow-in technology was mastered with one problem - difficulties with opening first casts and simultaneously overheating top; 3rd period is in progress nowadays, it includes developments of new methods for intensifying heat transfer during blow-in and scientifically generalize blow-in techniques. 
Major objectives of blow-in are to bring the blast furnace to normal operation, observing safety rules, in a short time, without significant costs, and to protect blast furnace and auxiliary equipment for long-term productive operation. These objectives are closely related to design features of blast furnaces, including the cooling system, type of lining, and furnace sizes, which have steadily increased from less than 500m3 to 5600m3.
Complexity of understanding the processes of burden column heating during blow-in period that forms a gas flow and cohesive zone in it is the reason for numerous discussions about rational blow-in techniques: methods for calculating and placing burden layers in a blast furnace, usage of various additives to hot blast (nitrogen, natural gas, blast furnace or coke oven gases, oxygen, steam, etc.), the rate of hot blast volume increasing, its temperature ramp up and pressure drops trend along the burden column. In addition, a potential usage of wood in the blow-in burden, installation of narrowing rings into tuyeres or plug part of tuyere for blow-in are discussed. 
Recommendations for blast furnaces blow-ins and comparison of "Traditional" blow-in vs. "Progressive" and blow-in with nitrogen, developed by ISI NASU, is presented.


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DTSTART:20230614T092000
DTEND:20230614T094000
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