Method of reducing nox-content in flue gas during heating of cok

Details Method of reducing nox-content in flue gas during heating of cok Method of reducing nox-content in flue gas during heating of cok

1990-08-02

1991-05-21

Woodard, Joye L.

Distillation: processes, thermolytic

Miscellaneous

202139, 202142, C10B 504, C10B 2122

Patent

active

050172700

ABSTRACT:
NO.sub.x -content in a flue gas during heating of coking oven with heating trains cooperating in pairs, high and low lying combustion stages, and flue gas return at a height of a heating train sole in a circulating stream, is reduced by adjusting a circulating stream rate defined by a volume stream of a returned flue gas divided by a flue gas volume stream without returned flue gas to between 20% and 50%, maintaining a stage ratio for a stage number greater than or equal to 2 defined as an air volume stream of a lower stage divided by a total air volume stream, at between 80/I% and 140/I% wherein I is a number of stages, arranging an upper combustion stage at a height of (45.+-.10%).times.(I-1) of the heating train height.

REFERENCES:
patent: 3373087 (1968-03-01), Ackeren
patent: 3996109 (1976-12-01), Pries
patent: 4004983 (1977-01-01), Pries
patent: 4244786 (1981-01-01), Thubeauville
patent: 4440599 (1984-04-01), Struck et al.
patent: 4704195 (1987-11-01), Janicka et al.

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