Patent ID: 9377242
Filing Date: 2016-06-28
CPC Classification: C01B,C21B,F27D,Y02P

Claim Text:
1. A method for treating waste gases from plants for pig iron production, comprising: receiving waste gas of a pig iron production plant; separating the waste gas into a first sub-stream of the waste gas and a second sub-stream of the waste gas; adding water and/or water vapor to the first sub-stream of the waste gas; following the addition of water and/or water vapor, subjecting the first sub-stream of the waste gas to at least partial conversion of CO into CO subsequently subjecting the first sub-stream of the waste gas to CO without subjecting the second sub-stream of the waste gas to conversion of CO into CO using the first and the second product gases for carburization and for regulating the carbon content in a reducing reactor of a direct reduction plant by mixing a first part of the second product gas with the first product gas to obtain a preset ratio of hydrogen to CO, and feeding the mixed first and second product gases to the reducing reactor of the direct reduction plant; and feeding a second part of the second product gas to the reducing reactor independently of the first part of the second product gas.