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US 2017/0284656 A1Published application
High temperature sub-critical boiler with common steam cooled wall between furnace and convection pass
AssigneeThe Babcock & Wilcox Company
InventorsEric L. Wells, Roger A. Detzel, Albert J. Bennett, Steven D. Thayer
Life of this patent
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Abstract
A boiler is disclosed in which the furnace is divided into a lower furnace and an upper furnace. The lower furnace uses water-cooled membrane walls, while the upper furnace uses steam-cooled membrane walls that act as superheating surfaces. The upper furnace and the convection pass are also located next to each other, so that they share a common steam-cooled wall. There is no open pass between the furnace and the convection pass.
Claims18
A boiler, comprising:
- an upper furnace having steam-cooled membrane walls, the steam-cooled membrane walls comprising pipes sealed by membrane disposed between and connected to the pipes;
- and
- a convection pass downstream of the upper furnace, the convection pass having steam-cooled membrane walls and extending downwards;
- wherein the upper furnace and the convection pass share a common steam-cooled membrane wall, the common steam-cooled membrane wall being both a wall of the upper furnace and a wall of the convection pass.
1 more element
A boiler, comprising:
- a furnace having steam-cooled membrane walls forming an upper portion of the furnace, the steam-cooled membrane walls comprising pipes sealed by membrane disposed between and connected to the pipes;
- and
- a convection pass having steam-cooled membrane walls forming at least a portion of the convection pass, and being fluidly connected to the upper portion of the furnace;
- wherein the furnace and the convection pass share a common steam-cooled membrane wall comprising a single layer of pipes sealed by a single layer of membrane disposed between and connected to the single layer of pipes.
1 more element
The boiler of claim 10, wherein the furnace includes:
- an upper furnace having the steam-cooled membrane walls and the common stream-cooled membrane wall;
- and
- a lower furnace having water-cooled membrane walls, the water-cooled membrane walls comprising pipes sealed by membrane disposed between and connected to the pipes.
A method of operating a boiler, comprising:
- combusting fuel to generate heated flue gas that flows sequentially upwards through an upper furnace and downwards through a convection pass;
- and
- sending superheated steam through a common steam-cooled membrane wall to capture heat energy from the heated flue gas and further superheat the superheated steam;
- wherein the common steam-cooled membrane wall is heated both by the heated flue gas flowing upward through the upper furnace and by the heated flue gas flowing downward through the convection pass.
1 more element
Dependencies are inferred from the claim text.