Method and apparatus for low nox combustion of gaseous fuels

Details Method and apparatus for low nox combustion of gaseous fuels Method and apparatus for low nox combustion of gaseous fuels

F - Mech Eng,Light,Heat,Weapons

23

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F23N 3/00 (2006.01) F22B 9/10 (2006.01) F22B 21/26 (2006.01) F22B 35/00 (2006.01) F23C 6/04 (2006.01) F23C 9/00 (2006.01) F23C 9/08 (2006.01) F23L 7/00 (2006.01)

Patent

CA 2076591

A method and apparatus for low NOX combus- tion of natural gas in a compact steam boiler having output steam delivery controlled by predetermined outlet steam pressure. The compact boiler employs a small high heat release combustor discharging into a forced draft convective heat exchange section. In operation, the compact boiler is completely and auto- matically self-operating, employing flue gas recircu- lation (FGR) wherein the FGR is admitted into the burner combustion air through a valve controlled by boiler flue gas NOX content. A novel bell mouthed flue gas scoop is utilized in the boiler stack up- stream of the NOX sensor. In an alternate combustion chamber design, a cylindrical water wall coil sur- rounds the combustion process, increasing boiler effi- ciency through the inherent large temperature differ- ence between the coil and the combustion in process, along with reducing the combustion temperature and further reducing the NOX content of combustion prod- ucts. A further variation in the combustion system utilizes a ceramic shield surrounding a natural gas burner as it fires into the compact combustion cham- ber. Primary and secondary combustion air are admit- ted to the combustion chamber through first stage combustion internal of the shell and second stage combustion occurring internal of the boiler combustion chamber.

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