|•||Steam can be used directly or used to generate electrical energy|
|•||Reduces conversion costs and consumption of fossil fuels|
|•||Modular structure facilitates modernization of existing plants|
Siemens Metals Technologies has developed a system for recovering heat from the hot off-gases of electric arc furnaces. The thermal energy that was previously discharged unused to the environment is now used to generate steam. The steam can be put to good use in other processes in the steel works or in the generation of electricity. The system has a modular structure and can be dimensioned for the amount of heat to be recovered and integrated into the existing exhaust gas cooling system. To maximize the amount of steam obtained, it can substitute the complete conventional off-gas cooling system in the electric steel plant. A possible saving of 22.5 kilowatt hours per metric ton of steel in the specific use of energy was proven in a Turkish steel mill. If the generated steam is used to preheat the feed water in the plant’s in-house power station, the annual savings potential amounts to 45,000 metric tons of coal.