B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/34 (2006.01) B01D 53/56 (2006.01) B05B 1/08 (2006.01) B05B 7/00 (2006.01) B05B 7/04 (2006.01) F23J 15/00 (2006.01) B05B 1/04 (2006.01)
Patent
CA 2123056
In the device for selective non-catalytic reduction of nitrogen oxides, a liquid nitrogen-containing reducing agent is sprayed through two-component lances into a stream of hot flue gases. Spraying occurs in pulsatory operation at a frequency of 5 to 70 per second, preferably 10 to 20 per second. As a result of this mode of operation, a spray cone of relatively coarse long-range drops and a spray cone of relatively fine short-range drops are produced alternately at each two-component nozzle. The reducing agent is ammonia dissolved in water (ammonia solution) at flue-gas temperatures of 1060°C to 1170°C. The device for working the method comprises a flue-gas duct 3 incorporating a number of two-component lances 4 operated by a pressure medium. The liquid and gas feed pipes for each two-component nozzle lance 4 are connected to a first resonance chamber 15 disposed in the two-component nozzle and upstream of at least one additional resonance chamber 18 separated from the first resonance chamber 15 by a restrictor 17. The last resonance chamber 18, considered in the direction of flow, is then directly connected to the outlet opening 19 of the two-component nozzle.
Lippmann Alfred
Listner Uwe
Schweitzer Martin
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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