Single drum all-welded boiler
AssigneeThe Babcock & Wilcox Company
InventorsThomas P. Seifert, Warren E. Longfield
Life of this patent
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Abstract
A single drum all-welded boiler system is disclosed for a furnace having a combustion chamber and a convection pass connected to the combustion chamber in a transition area, comprising a superheater in the transition area, an economizer in the convection pass and a boiler between the superheater and the economizer. The boiler and economizer can be made of a plurality of modules each comprising several tubes welded at the top to an outlet header and at the bottom to an inlet header.
Claims8
A single drum all-welded boiler system for a furnace having a combustion chamber and a convection pass downstream of the combustion chamber and connected to the combustion chamber in a transition area, comprising:
- a superheater disposed in the transition area having an inlet and an outlet;
- an economizer disposed in the convection pass having an inlet and an outlet;
- a boiler disposed in said convection pass between said economizer and said superheater, said boiler comprising at least one modular unit made up of a plurality of tubes welded at the bottom to a common inlet header and at the top to a common outlet header, wherein the boiler and economizer modular units have extended surface in the form of fins welded on each side of the tubes parallel to the direction of gas flow and have vertical upward flow of fluid in the tubes;
- a plurality of unheated downcomer pipes, not exposed to combustion gas, extending vertically downward from a single steam drum to supply water to the lower furnace wall headers and to the lower headers of the boiler modules;
- and
- said single steam drum having at least one inlet connected to said economizer outlet and at least one outlet connected to said superheater inlet;
- the drum located in an area not exposed to combustion gas flow.
A single drum all-welded boiler system for a furnace having a combustion chamber and a convection pass downstream of the combustion chamber and connected to the combustion chamber in a transition area, comprising;
- a superheater disposed in the transition area having an inlet and an outlet;
- an economizer disposed in the convection pass having an inlet and an outlet;
- a single steam drum having at least one inlet connected to said economizer outlet and at least one outlet connected to said superheater inlet, the drum located in an area not exposed to combustion gas flow, wherein said superheater comprises a plurality of vertically extending tubes, said system including rapper means for applying impacts to said superheater tubes, and wherein said superheater tubes are arranged in a plurality of aligned rows, said rapper means comprising lugs connected to each tube of each row for engaging each tube of each row, an impact member at one end of each row, and a ram movable to strike each impact member.
A single drum all-welded boiler sytem for a furnace having a combustion chamber and a convection pass downstream of the combustion chamber and connected to the combustion chamber in a transition area, comprising;
- a superheater disposed in the transition area having an inlet and an outlet;
- an economizer disposed in the convection pass having an inlet and an outlet;
- a single steam drum having at least one inlet connected to said economizer outlet and at least one outlet connected to said superheater inlet, the drum located in an area not exposed to combustion gas flow,
- wherein said superheater comprises a plurality of vertically extending tubes, said system including rapper means for applying impacts to said superheater tubes, wherein said superheater tubes are arranged in a plurality of aligned rows, said rapper means comprising lugs connected to each tube of each row for engaging each tube of each row, an impact member at one end of each row, and a ram movable to strike each impact member, and wherein each row is aligned in a flow direction in said transition area, each impact member positioned on a downstream end of each row in said flow direction, each ram positioned at a downstream end of said transition area for striking each impact member.
Dependencies are inferred from the claim text.