Liquid heaters and vaporizers – Heat transmitter
Patent
1993-08-10
1995-07-18
Yuen, Henry C.
Liquid heaters and vaporizers
Heat transmitter
110234, 110345, 431 76, F22B 2306
Patent
active
054331749
ABSTRACT:
A method and apparatus for low NOX combustion 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 automatically self-operating, employing flue gas recirculation (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 upstream of the NOX sensor. In an alternate combustion chamber design, a cylindrical water wall coil surrounds the combustion process, increasing boiler efficiency through the inherent large temperature difference between the coil and the combustion in process, along with reducing the combustion temperature and further reducing the NOX content of combustion products. A further variation in the combustion system utilizes a ceramic shield surrounding a natural gas burner as it fires into the compact combustion chamber. Primary and secondary combustion air are admitted 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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Brady Robert T.
Townsend Dean C.
Weller George A.
Werling Joseph H.
Lidd Francis J.
Lo Weilun
Mark IV Transportation Products Corporation
Yuen Henry C.
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