METHOD FOR DENITRATING WASTE GAS

PURPOSE:To reduce the energy for heating aq. ammonia by supplying only the heat sufficient to vaporize ammonia to aq. ammonia to vaporize only ammonia, reducing the nitrogen oxides in the waste gas with the vaporized ammonia and removing the nitrogen oxides. CONSTITUTION:When the nitrogen oxides in...

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Bibliographic Details
Main Author SERIZAWA AKIRA
Format Patent
LanguageEnglish
Published 11.04.1991
Subjects
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Summary:PURPOSE:To reduce the energy for heating aq. ammonia by supplying only the heat sufficient to vaporize ammonia to aq. ammonia to vaporize only ammonia, reducing the nitrogen oxides in the waste gas with the vaporized ammonia and removing the nitrogen oxides. CONSTITUTION:When the nitrogen oxides in waste gas are removed by ammonia as a reducing agent, the high-temp. waste gas 5 in a flue 1 is supplied to a volatilizer 4 as the heat sufficient for vaporizing ammonia in aq. ammonia 7 as the source of ammonia. The nitrogen oxides in the waste gas in the flue 1 are reduced by the vaporized ammonia and removed, and the residual water 11 is used as boiler feed water or the water to be injected to reduce the nitrogen oxides in a boiler combustion chamber. Consequently, the heat energy for volatilizing ammonia is reduced, and the amt. of steam to be evaporated in the waste heat recovery boiler is increased.
Bibliography:Application Number: JP19890221697