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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Effect of the co-injection of PC and coke oven gas on the raceway and shaft phenomena in a blast furnace
DESCRIPTION:Effect of the co-injection of PC and coke oven gas on the raceway and shaft phenomena in a blast furnace

Injection of coke oven gas (COG) containing about 60% of pure hydrogen and nearly 25% hydrocarbons, has a potential for lowering the CO2 emissions from a blast furnace (BF). Hüttenwerke Krupp Mannesmann (HKM) in Duisburg has commissioned a COG injection system to operate blast furnaces with injection of PC and COG via two lances in the tuyere. In order to optimise this technology, a theoretical and experimental study on the raceway conditions, coal conversion, as well as pellets and sinter reduction behaviour while injecting COG has been conducted at RWTH Aachen University. In this contribution, first, the analysis of the COG influence on the BF process parameters and the effect of tuyere and lance design on PC conversion were undertaken. Then, injection trials using the MIRI plant were performed with varying PC and COG amounts while keeping constant blast temperature and oxygen enrichment. Furthermore, COG was replaced with natural gas. The conversion degree is determined based on the offgas analysis. Coal residues are undergoing microscopical investigations. 
Next, isothermal reduction test of pellets and sinter at three temperatures (850, 1000 and 1150°C) under two gas compositions with different contents of CO, CO2, H2, H2O and N2 were conducted using a 3-zone tube furnace. Mass losses were measured continuously during the test and the reduction degree was determined. In addition, changes in material microstructure and morphology were analysed using a scanning electronic microscope combined with EDX.

CLASS:PUBLIC
DTSTART:20230615T111000
DTEND:20230615T113000
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