Recovery boiler and method of reducing NO.sub.x emissions
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United States of America Patent
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Oct 3, 1995
Grant Date -
N/A
app pub date -
Aug 27, 1993
filing date -
Mar 18, 1991
priority date (Note) -
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Abstract
The invention relates to a method of firing black liquor in recovery boilers where the intention is to obtain fumes having a low content of nitrogen oxides (NO.sub.x). A part of the combustion air is added as a last portion at a very high level so that a reducing atmosphere will exist in a very great part of the boiler for a long time period, e.g. at least 3-5 seconds.
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