NO.sub.x reduction in flue gas

Details NO.sub.x reduction in flue gas NO.sub.x reduction in flue gas

1984-03-27

1985-06-04

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423239, C01B 2100, B01J 800

Patent

active

045213887

ABSTRACT:
A selective catalytic reduction process (SCR) for reducing the oxides of nitrogen (NO.sub.x) content of a furnace flue gas. The process comprises splitting the flue gas into two streams, treating one of the streams with an SCR process with the same amount of NH.sub.3 as NO.sub.x, and then recombining the streams. By treating only a portion of the flue gas using an NH.sub.3 /NO.sub.x ratio of unity, the amount of catalyst required is reduced while the residual NO.sub.x and NH.sub.3 contents of the recombined streams is controlled to desired levels.

REFERENCES:
patent: 4129651 (1978-12-01), Koike et al.
patent: 4224292 (1980-09-01), Uchida et al.
patent: 4388281 (1983-06-01), Holter et al.

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