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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Influence of a higher hydrogen based reduction share on the Blast Furnace process derived from analysis of data during natural gas injection periods
DESCRIPTION:Until 2030 the EU has the objective to decrease CO2 emissions by 55%. The steel industry plans to reach substantial emission reductions by shifting to new steel production process routes like direct reduction combined with electric melting – but those process routes require availability of hydrogen, or in the first step natural gas in huge amounts and at competitive prices. However, currently the energy crisis decreases the economic feasibility of those new process routes.
Consequently, it is reasonable to think about fast feasible bridge technologies to enable maximum CO2 mitigation in current blast furnace based process routes. One such bridge technology, already followed by multiple steel producers, is increasing the ore reduction share by hydrogen in the blast furnace. Higher hydrogen concentrations in the reducing gas lead to a shift between direct and indirect reduction, but also influence the process gas density and viscosity. Especially in Europe there is only little experience on blast furnace operations points with such higher hydrogen loads. 
HKM already announced to increase the hydrogen content in their blast furnaces by injection of coke oven gas. To prepare this operation, a study was executed comparing several historical operation periods at HKM with mixed natural gas and coal injection to similar periods with coal only operation. This study comprises analysis of differences in data distributions for nearly all data series from a blast furnace often used to rate the furnace working state. This article presents the differences found e.g. for the top gas properties, stack wall pressure and temperature measurements as well as other operational parameters to work out the changes in blast furnace working states with a higher hydrogen reduction share.
CLASS:PUBLIC
DTSTART:20230615T121000
DTEND:20230615T123000
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