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US 8,281,750 B2Granted
Boiler furnace to avoid thermal NOx
OwnerByung-Doo Kiminventor
Life of this patent
Estimating the term…
Abstract
A boiler furnace avoids NOx and increases thermal efficiency with a small boiler. The boiler furnace has an outer water wall and an inner water wall with flared top and bottom portions.
Claims18
A boiler furnace, comprising:
- an outer water wall;
- and
- an inner water wall positioned inside the outer water wall to define
- a combustion space between the outer water wall and the inner water wall, and
- a non-combustion air space inside the inner water wall;
- wherein the inner water wall comprises a circular cross section with a middle portion having a narrower diameter and top portions having a wider diameter.
3 more elements
A boiler furnace, comprising:
- an outer water wall with a plurality of fuel nozzles to spray fuel;
- a curved inner water wall positioned inside the outer water wall to define a combustion space between the outer water wall and the inner water wall;
- a furnace wall surrounding the outer water wall;
- and
- a thermal insulator positioned between the furnace wall and the outer water wall;
- wherein fuel ignited in the combustion space produces an annular flame around the curved inner water wall.
3 more elements
A method of operating a boiler furnace that includes a curved inner water wall with flared top and bottom portions surrounded by an outer water wall to define a combustion chamber between the inner and outer water walls, the method comprising:
- spraying fuel from the outer wall into the combustion chamber;
- injecting an airflow through the inner wall into the combustion chamber;
- igniting the air-fuel mixture in the combustion chamber to cause a flame in an annular or ring-like shape around the curved inner water wall and surrounded by the outer water wall.
Dependencies are inferred from the claim text.