Process for obtaining flue gases with low content of NO.sub.x in a black liquor recovery boiler
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United States of America Patent
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Jun 6, 2000
Grant Date -
N/A
app pub date -
Jun 4, 1998
filing date -
Dec 13, 1995
priority date (Note) -
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Abstract
The invention relates to a process for combusting black liquor in recovery boilers where the intention is to obtain flue gases which have a low content of nitrogen oxides (NO.sub.x). The invention is characterized in that ammonia is supplied to a part of the combustion air, which part is then supplied to the recovery boiler, as the final portion, at a high level, so that a reducing atmosphere is created in a very large part of the recovery boiler and for a long time, of at least 2.5-5 seconds or more. The invention also includes a recovery boiler for implementing the above mentioned process.
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