US Patent 9314739 Process and apparatus for denoxing of flue gases

A process and an apparatus denox flue gases containing carbon monoxide and/or gaseous organic substances with at least one catalyst for catalytic reduction of the nitrogen oxide NOx and a heat exchanger for heating the flue gases from recovery of the residual heat of the denoxed flue gases before the catalytic reduction to a reaction temperature of 160° C. to 500° C. For the best possible denoxing of the flue gases with simultaneous minimization of the externally supplied energy needed, it is envisaged that the losses associated with the heat movement in the heat exchanger will be compensated for by providing at least one stage for regenerative post combustion of the carbon monoxide and/or of the gaseous organic substances.