General Electric Company

The Babcock & Wilcox Company

Babcock & Wilcox Power Generation Group, Inc.

Thomas Alfred Laursen

Chris E Latham

Albert D LaRue

David Robert O'Connor

John B Kitto

Donald Keith Morrison

Robert William Waltz

Eric M Warren

William Theodore Lipinski

Paul Gregory Stonkus

Christopher J Thompson

Peter V Centore

George M Gorring

Shan A Shanmugavel

James J Jennings

Roger J Kleisley

Duane Plessinger

Kevin A Larson

Don Morrison

Donald K Morrison

A method and apparatus effectively bypasses flue gas through or around selected boiler convection heat transfer tube banks within a new or existing boiler flue. Heat transfer tubes are removed, or omitted in the design of a new boiler flue, forming one or more voids at one or more locations within the tube banks. A bypass flue or conduit is formed within each void, for example using steel plates, along with existing flue walls, or using an integral sleeve. A wall of the bypass flue may include water or steam-cooled tubes. Dampers may be installed at either end of or within the bypass flue to control the amount of flue gas directed through each bypass flue.

Steam generator arrangement

The boiler nose or arch of a furnace projects into the upwardly flowing flue gas to form a restricted passage. Overfire air is introduced into the cavity or plenum of the boiler nose and flows to injection ports along the inclined surface of the boiler nose to provide overfire air for penetration into and mixing with the flue gases in the restricted flue gas passage.

Injection of overfire air through the upper furnace arch for penetration and mixing with flue gas

A damper box for an orifice air injector, the damper box comprising front and rear faces with respective front and rear openings therein, a pair of sides, a top and a bottom; and a pair of gates pivotally mounted within the damper box and actuatable between open and closed positions.

Zero cooling air flow overfire air injector and related method

A burner system for a furnace includes horizontal rows of cell burners some of which contain a secondary air port vertically spaced from a coal nozzle. The cell burners are in the front and rear walls of the furnace. Near the side walls of the furnace, which are connected between the front and rear walls, additional double-burner cells are provided which include a pair of vertically spaced coal nozzles or burners. Either a single lower row or a lower and upper row of cell burners include the double-burner cells at the side walls. The double cell burners are operated at 1.0 or higher throat stoichiometry. This reduces corrosion at the side walls while only slightly increasing NO.sub.x emission.

Burner pattern to minimize sidewall corrosion potential

A low NO.sub.x burner system for a furnace having spaced apart front and rear walls, comprises a double row of cell burners on each of the front and rear walls. Each cell burner is either of the inverted type with a secondary air nozzle spaced vertically below a coal nozzle, or the non-inverted type where the coal nozzle is below the secondary air port. The inverted and non-inverted cells alternate or are provided in other specified patterns at least in the lower row of cells. A small percentage of the total air can be also provided through the hopper or hopper throat forming the bottom of the furnace, or through the boiler hopper side walls. A shallow angle impeller design also advances the purpose of the invention which is to reduce CO and H.sub.2 S admissions while maintaining low NO.sub.x generation.

Low NO.sub.x burner system

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Canton, OH, United States of America

Thomas Alfred Laursen