In the EAF, and the BOF for producing steel, the major off gas is CO. If the CO can be combusted to CO2, and the energy transferred to the metal, this reaction will reduce the energy consumed in the EAF. It will allow for more scrap melting in the BOF which would significantly lower the energy required to produce steel. This reaction is referred to as post combustion. In order to optimize the post combustion process, computational fluid dynamic models (CFD) of the two steelmaking processes were developed.