Method and Apparatus for Firetube Boiler and Ultra Low NOx Burner
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United States of America Patent
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app pub date -
Nov 16, 2015
filing date -
Nov 16, 2015
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Abstract
The current invention disclose a method and apparatus for production of hot water or steam in a firetube boiler and burner, said method comprising the steps of producing a first flue gas in a first stage of a burner associated with the firetube boiler, passing at least a portion of said first flue gas through a first pass and a second pass of the boiler, wherein each of said first and second passes comprises at least one firetube; routing said portion of said first flue gas to a second stage of said burner to reduce the flame temperature and NOx emissions of said second stage of said burner; producing a second flue gas in said second stage of said burner; passing said second flue gas through a third pass of the boiler, wherein said third pass comprises at least one firetube.
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