Protection of the air ports of a recovery boiler
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United States of America Patent
Stats
-
Feb 15, 2000
Grant Date -
N/A
app pub date -
Mar 11, 1998
filing date -
Mar 12, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for extending the life of air ports and nozzles in furnaces, particularly recovery boilers for burning black liquor to produce heat and a chemical melt. Apparatus is provided for feeding combustion air into a furnace having a tube wall, the apparatus comprising: an air port disposed in the tube wall, and connected to an air duct through which air flows into and then through the air port, and into the furnace; and a protective insert of heat conductive and heat and corrosion resistant material mounted in the air port and positioned so that it is cooled by the air flowing through the air port. The protective insert has sufficient thermal mass (e.g. a volume of between 40,000-4,000,000 cubic mm) so as to effectively even out temperature peaks caused by melt splashes from the furnace impacting the vicinity of the air port, e. g. the protective insert is made out of highly corrosion resistant steel such as stainless steel. The air port may be defined by, or comprise, a nozzle having an interior and a bottom portion; and wherein the protective insert is preferably releasably mounted to the interior bottom portion of the nozzle in the air flow from an air duct to the furnace.
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