Patent ID: 7648673

Claim:
In a process for denoxification of off-gases from annealing and pickling lines having a respective annealing furnace and pickling section, wherein the off-gases from the pickling section are heated and denoxified by selective catalytic reduction (SCR), the improvement comprising: heating the off-gases from the pickling station in a heat exchanger; merging the heated off-gases from the pickling station with the off-gases from the annealing furnace whereby heat from the off-gases from the annealing furnace is supplied to the off-gases from the pickling section; subjecting the merged off-gas stream to selective catalytic reaction; and supplying heat from the merged off-gas stream to the off-gasses from the pickling station in the heat exchanger, before the off-gases from the pickling station are merged with the off-gas from the annealing furnace.