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US 2009/0260582 A1Published application
Boiler Furnace To Avoid Thermal NOx
OwnerByung-Doo KIMinventor
Life of this patent
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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.
Claims19
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;
- 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.
1 more element
The boiler furnace of claim 5, wherein the first set of water pipes comprise a helical arrangement.
A boiler furnace, comprising:
- an outer water wall;
- 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;
- a furnace wall surrounding the outer water wall;
- and
- a thermal insulator positioned between the furnace wall and the outer water wall;
- wherein the inner water wall comprises a circular cross section with a flared top portion having a wider diameter at the top portion.
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.