초록 ▼

An apparatus and method for reducing NO.sub.x pollution in flue gas produced by a power plant uses heat exchanger elements having extended surfaces which contain a SCR catalyst, with the heat exchanger elements located in the flue gas stream. Coolant is passed through the heat exchanger elements to

An apparatus and method for reducing NO.sub.x pollution in flue gas produced by a power plant uses heat exchanger elements having extended surfaces which contain a SCR catalyst, with the heat exchanger elements located in the flue gas stream. Coolant is passed through the heat exchanger elements to cool the catalyst, with a temperature control system used to maintain the catalyst at its optimum temperature such that the maximum conversion of NO.sub.x is achieved. Utilizing the present invention, temperature cycling of the catalyst is avoided, prolonging the life of the catalyst, while at the same time optimizing the efficiency of conversion regardless of variations in the flue gas flow or temperature.

대표청구항 ▼

[ What is claimed is:] [1.] A catalytic method for reducing NOX in a flue gas stream comprising:providing a flue gas stream containing NOX;placing at least one heat exchange element having extended surfaces in the flue gas stream, the heat exchange element having a SCR catalytic on at least the exte

[ What is claimed is:] [1.] A catalytic method for reducing NOX in a flue gas stream comprising:providing a flue gas stream containing NOX;placing at least one heat exchange element having extended surfaces in the flue gas stream, the heat exchange element having a SCR catalytic on at least the extended surfaces thereof,;passing a temperature altering medium through the heat exchange element; and,providing a temperature control system to control the temperature of the temperature altering medium such that the SCR catalyst is maintained at its optimum temperature to achieve about 80% conversion of NOX.