Reducing Z.sub.20 emissions

Details Reducing Z.sub.20 emissions Reducing Z.sub.20 emissions

1992-07-29

1994-09-06

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C01B 2100

Patent

active

053446291

ABSTRACT:
The amount of N.sub.2 O in flue gases discharged from a fluidized bed combustion system is minimized by effecting vigorous and intimate mixing of the flue gases (with entrained particles) from a fluidized bed by increasing the velocity of the flue gases and then decreasing the velocity from the increased level, introducing a N.sub.2 O decomposing catalyst into the flue gases and particles immediately after increasing and decreasing of the velocity, and mixing the N.sub.2 O catalyst with the flue gases and particles, to effect decomposition of the N.sub.2 O. The catalyst is a calcium based sorbent, such as CaO or limestone, although and other catalysts also may be utilized. Normally the decomposition takes place without increasing the temperature of the flue gases. The increase in velocity is achieved by providing a constriction in the combustor vessel. The interior of the combustor vessel is lined with erosion resistant and thermal insulating material. Where the catalyst is calcium based sorbent, it is calcined, and the calcined particles are removed from the flue gases and recirculated to the fluidized bed, providing at least about 10 to 30% of the calcium based sulfur absorbing sorbent necessary to remove sulfur from the flue gases.

REFERENCES:
patent: 4877743 (1989-10-01), Waugh et al.
patent: 4915920 (1990-04-01), Kobayashi et al.
patent: 5133950 (1992-07-01), Oakes et al.

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