Upside-down type low NOx boiler
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United States of America Patent
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May 1, 2018
Issued Date -
Aug 18, 2011
app pub date -
Dec 8, 2009
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
In a low NOx boiler of the present invention, a high-temperature reductive combustion zone is provided to an upper portion of a rectangular combustion chamber, and a second-step combustion zone is provided to a middle stage of the combustion chamber. A wall provided below the second-step combustion zone is tapered to narrow the combustion chamber, with a taper angle of approximately 35° or so, relative to a vertical line. An ash discharge port is provided to a furnace bottom portion, and a gas outlet port communicated with a rear pass is provided to a lower side face of the second-step combustion zone. This rear pass is connected with a further post-treatment step, via a super-heater tube and an economizer.
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