| 摘要 |
An improved combustion system for reducing NOx in a furnace 10 is provided having a primary flame zone 12. The primary flame zone 12 includes a plurality of burners 14 located therein which are operated on a sub-stoichiometric level thereby producing uncombusted natural gas (or hydrocarbon). The burners 14 also facilitate the passage of the uncombusted natural gas (or hydrocarbon) from the primary flame zone 12 into a secondary flame zone 18 above the primary flame zone. The secondary flame zone 18 is provided with a natural draft port 20, having a predetermined cross-sectional area, formed therein at a predetermined distance above the primary flame zone 12. As a result, air of a predetermined volume is induced into the secondary flame zone 18 so that uncombusted natural gas (or hydrocarbon) in the secondary flame zone is combusted thereby reducing NOx emissions from the furnace 10.
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