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

1991-05-03

1992-07-28

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

B01J 800, C01B 2100

Patent

active

051339501

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 exygen 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.) 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.

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Kramlich et al, "Mechanisms of Nitrous Oxide Formation in Coal Flames", Combustion and Flame 77:375-384 (1989); Elsevier Science Publishing Co., Inc., New York.

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