Reducing N.sub.2 O emissions when burning nitrogen-containing fu

Details Reducing N.sub.2 O emissions when burning nitrogen-containing fu Reducing N.sub.2 O emissions when burning nitrogen-containing fu

1992-01-08

1995-08-15

Lewis, Michael

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

110345, 110211, C01B 2122

Patent

active

054417147

ABSTRACT:
The amount of N.sub.2 O emission from a fluidized bed reactor is reduced by adding a hydrogen radical providing additive (e.g. a hydrogen containing fuel such as natural gas or alcohol) to the flue gases discharged from the fluidized bed. Sufficient oxygen is present in the flue gases--either by addition with the additive, or by addition of an excess to the combustion chamber--so that the additive reacts with the oxygen, typically raising the temperature of the flue gases (e.g. from about 700.degree.-900.degree. C. to about 950.degree.-1100.degree. C.) that is from about 1292.degree.-1652.degree. F. to about 1742.degree.-2012.degree. F. so that N.sub.2 O production is reduced about 10-90%. The additive may be injected in or just prior to a cyclone for separating particles from the flue gases, in a gas discharge immediately after the cyclone (e.g. just downstream of a heat exchanger for cooling the flue gases and flattening the velocity profile of the flue gases), just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.

REFERENCES:
patent: 5043150 (1991-08-01), Hiltunen et al.
patent: 5048432 (1991-09-01), Hofmann et al.
patent: 5103773 (1992-04-01), Andersson et al.

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