Method of reducing nox-content in flue gas during heating of coking oven
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United States of America Patent
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-
May 21, 1991
Issued Date -
N/A
app pub date -
Aug 2, 1990
filing date -
Apr 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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