scope:

Gives guidance on writing the technical specification for the procurement of processes and equipment for the removal of nitrogen oxides from the flue gases of steam generating plant in the electrical power supply industry. This includes: - Selective and Non-selective Catalytic Reduction Systems (SCR and SNCR). - Systems to meet specific flue gas nitrogen oxide discharge requirements. - Systems applying different types of ammonia-based solutions as reagent. - Systems applying urea and other NH₃-containing species as reagent. Some of the provisions may be applicable to steam generating plant for other applications. The equipment covered by this guide is related to its function rather than design type. Therefore the flue gas denitrification (DeNo_x) plant requirements are stated in performance terms rather than being specified by a detailed description of the equipment to be supplied.