Process for obtaining flue gases with low content of NO.sub.x wh

Details Process for obtaining flue gases with low content of NO.sub.x wh Process for obtaining flue gases with low content of NO.sub.x wh

1999-07-19

2000-12-05

Wilson, Pamela

Liquid heaters and vaporizers

Industrial

Waste heat

162 31, F22D 102

Patent

active

061552100

ABSTRACT:
The invention relates to a method of firing black liquor in recovery boilers where the intention is to get fumes having a low content of nitrogen oxides (NO.sub.x). The invention is characterized in that a part of the combustion air is added as a last portion at a level on a very high level so that a reducing atmosphere will exist in a very great part of the boiler and during a long period of time of at least 3-5 seconds. The invention also includes a recovery boiler for carrying out the above said method.

REFERENCES:
patent: 3625186 (1971-12-01), Herbst
patent: 4462319 (1984-07-01), Larsen
patent: 5022331 (1991-06-01), Simonen
patent: 5478440 (1995-12-01), Paju
patent: 5771817 (1998-06-01), Olausson et al.
patent: 5803020 (1998-09-01), Palmgren

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