Blast Furnace Gas Based Combustion Systems in Steel Reheating Furnaces

modelling has been carried out and validated with the pilot testing results, so that a numerical set-up has been defined for BFG firing. For this purpose a new radiation model for the radiative properties of the products of combustion of BFG has been developed, considering the low water vapor - carbon dioxide ratio. By means of preheating BFG with the waste heat content in flue gases stream, the typical operating temperatures of reheating furnaces (1350ºC) have been achieved without natural gas enrichment, keeping the NOx emissions level below the European regulation threshold.