Reducing emissions of N.sub.2 O when burning nitrogen containing

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

1990-04-17

1991-08-27

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

050431501

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.) 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, just prior to a superheater of a convection section, or in a combustion chamber just prior to a gas turbine.

REFERENCES:
patent: 2910343 (1959-10-01), Childers et al.
patent: 3125408 (1964-03-01), Childers et al.
patent: 4609536 (1986-09-01), Yoon et al.
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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