Method for using the exhaust gases from plants for raw iron manufacture for generating steam

摘要

The invention relates to a method and a system for the method for using the exhaust gases of plants for raw iron manufacture for steam generation, wherein at least some of the exhaust gas is carried away as export gas (12) from the plant for raw iron manufacture and is thermally exploited by means of combustion, and wherein the exhaust gas from the combustion is supplied to a heat-recovery steam generator (29). In order to be able to use more energy from the export gas (12) for power generation, provision is made that the export gas (12) is fed into a combustion chamber (23) which is arranged upstream of the heat-recovery steam generator (29), and that heat is drawn from the export gas (12) after combustion in the heat-recovery steam generator (29), without the export gas (12) passing through a gas turbine between combustion and the heat-recovery steam generator, wherein the pressure in the combustion chamber (23) and the heat-recovery steam generator (29) is set above atmospheric pressure, particularly up to 3.5 bar