High temperature sub-critical boiler with steam cooled upper furnace
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. A transition section is present between the lower furnace and the upper furnace. The boiler is a high temperature sub-critical natural circulation boiler which is completely top supported. The lower furnace is supported through the transition section by the upper furnace.
Claims19
A boiler, comprising:
- a lower furnace having water-cooled membrane walls;
- an upper furnace having steam-cooled membrane walls;
- a steam separator having a fluid inlet and a dry steam outlet;
- a water-cooled circuit connected to the fluid inlet of the steam separator to deliver wet steam to the steam separator, the water-cooled circuit including the water-cooled membrane walls of the lower furnace;
- and
- a steam-cooled circuit connected to the dry steam outlet of the steam separator to receive steam from the dry steam outlet, the steam-cooled circuit including the steam-cooled membrane walls of the upper furnace.
A method for generating superheated steam, comprising:
- combusting a fuel in a lower furnace of a boiler;
- generating wet steam from water in water-cooled membrane walls of the lower furnace;
- separating the wet steam into dry stream and water in a steam separator;
- sending dry stream to steam-cooled membrane walls of an upper furnace and the convection pass of the boiler to generate superheated steam.
A boiler, comprising:
- a lower furnace having water-cooled membrane walls that create a sealed enclosure, the water-cooled membrane walls comprising pipes sealed by membrane disposed between and connected to the pipes;
- burners arranged to combust fuel to create a flue gas in the lower furnace;
- an upper furnace having steam-cooled membrane walls that create a sealed enclosure, the steam-cooled membrane walls comprising pipes sealed by membrane disposed between and connected to the pipes, the upper furnace arranged to receive the flue gas flowing upward out of the lower furnace;
- a steam separator having a wet steam inlet and a dry steam outlet;
- a water-cooled circuit connected to the wet steam inlet of the steam separator, the water-cooled circuit including the pipes of the water-cooled membrane walls of the lower furnace;
- and
- a steam-cooled circuit connected to the dry steam outlet of the steam separator, the steam-cooled circuit including the pipes of the steam-cooled membrane walls of the upper furnace.
Dependencies are inferred from the claim text.