The Swedish and Finnish National Committees of the International Flame Research Foundation – IFRF HOT STOVE OXYGEN-ENRICHED COMBUSTION IN AN IRON-MAKING PLANT Chuan Wang1,*, Andy Cameron2, Axel Bodén1, Jonny Karlsson3, Patrick Lawrence Hooey1,4 1,*Centre for process integration in steelmaking Swerea MEFOS, Luleå, Sweden
[email protected] 2Linde Gas, The Priestley Centre, 10 Priestley Road Guildford, Surrey England
[email protected] 3SSAB EMEA Luleå Sweden
[email protected] 4University of Oulu (Adjunct Professor) Oulun Yliopisto Finland * corresponding author ABSTRACT The presented paper investigates the application of oxygen-enriched combustion in hot stoves in an iron-making plant. The enriched oxygen is used to reduce the consumption of the high calorific value gas of COG while maintaining the same flame temperature in the hot stoves as the reference case. The investigation is carried by using a spreadsheet hot stove model. Compared to the conventional oxygen-enriched combustion, higher stove efficiency can be achieved when heat exchanger is installed to recover the sensible heat in flue gas by preheating combustion air and BFG; higher stove efficiency can also be achieved when parts of flue gas are recirculated to hot stoves. For the studied plant, it indicates that heat exchanger has a better effect than flue gas recirculation in terms of stove efficiency. However, it has been noticed that flue gas recirculation can help to concentrate CO2 content in the flue gas, which will be essential for the carbon capture in the BF iron-making process. Keywords: oxygen-enriched; hot stoves; blast furnace (BF); flue gas recirculation 1.