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US 10,429,062 B2Granted
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.
Claims18
A boiler, comprising:
- a lower furnace having water-cooled membrane walls;
- an upper furnace having steam-cooled membrane walls and located above the lower furnace, wherein flue gas passes from the lower furnace to the upper furnace, and wherein the steam-cooled membrane walls of the upper furnace include a front wall, a rear wall, and side walls;
- a convection pass downstream of the upper furnace, the convection pass having steam-cooled convection pass membrane walls and extending downwards, wherein the steam-cooled convection pass membrane walls of the upper furnace include a front wall, a rear wall, and side walls;
- wherein the upper furnace and the convection pass share a common steam-cooled membrane wall, the common steam-cooled membrane wall being both the rear wall of the upper furnace and the front wall of the convection pass;
- a baffle wall that divides the convection pass into a front convection pass and a rear convection pass;
- a primary superheater in the rear convection pass;
- a secondary superheater disposed inside the upper furnace;
- 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 dry steam from the dry steam outlet, the steam-cooled circuit running sequentially from the dry steam outlet through the rear wall of the convection pass, the side walls of the convection pass, the baffle wall, through the primary superheater, through the upper furnace front wall and the common steam-cooled membrane wall, then through the upper furnace side walls, and through the secondary superheater.
8 more elements
A method for generating superheated steam, comprising:
- combusting a fuel in a lower furnace of a boiler, wherein an upper furnace is located above the lower furnace, and flue gas passes from the lower furnace to the upper furnace and then through a convection pass;
- wherein the upper furnace includes a front wall, a rear wall, and side walls;
- wherein the convection pass includes a front wall, a rear wall, and side walls;
- wherein the upper furnace and the convection pass share a common wall, the common wall being both the rear wall of the upper furnace and the front wall of the convection pass;
- wherein the boiler further includes a baffle wall that divides the convection pass into a front convection pass and a rear convection pass;
- generating wet steam from water in water-cooled membrane walls of the lower furnace;
- separating the wet steam into dry steam and water in a steam separator;
- sending dry steam sequentially through the convection pass rear wall, the convection pass side walls, the baffle wall, through a primary superheater in the rear convection pass, through the upper furnace front wall and the common wall, then through the upper furnace side walls, and through a secondary superheater.
5 more elements
Dependencies are inferred from the claim text.