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

A method for generating steam using waste gas from a plant for pig iron manufacture, the method comprising:

• removing at least some of the waste gas as export gas from the plant for pig iron manufacture, conveying the export gas to a combustion chamber which is located upstream of a heat-recovery steam generator, thermally utilizing the waste gas by combustion, and feeding the waste gas from the combustion to a heat-recovery steam generator, and extracting heat from the export gas after combustion of the export gas in the heat-recovery steam generator, without passing the export gas through a gas turbine between the combustion and the heat-recovery steam generator;
• setting the pressure in the combustion chamber and the heat-recovery steam generator above atmospheric pressure, by setting a quantity of export gas which reaches the combustion chamber or the heat-recovery steam generator via a gas flow regulator which is located downstream of the heat-recovery steam generator;
• wherein the waste gas emerges from at least one reduction reactor of the plant for the manufacture of pig iron, and the waste gas is not dedusted upstream of the heat-recovery steam generator and only the combusted export gas emerging from the heat-recovery steam generator is dedusted, or is not dedusted upstream of the heat-recovery steam generator and only the combusted export gas emerging from the heat-recovery steam generator is dedusted, or is coarsely dedusted upstream of the heat-recovery steam generator and the combusted export gas emerging from the heat-recovery steam generator is finely dedusted.