Two-Stage Selective Non-Catalytic Process for Nitrogen Oxide Removal from Thermal Generating Unit Flue Gases

The study is aimed at the development of a non-catalytic process for removal of nitrogen oxides from flue gases of thermal generating units. The results of experimental studies of a modified two-stage selective non-catalytic reduction of nitrogen oxides with injection of a reducing agent (urea) below the stoichiometric amount in each stage are described. The possibility of attaining a higher and more stable reducing efficiency compared with the conventional one-stage process and minimization of the formation of ammonia as a secondary pollutant is demonstrated.