Mark A Bock

US Patent:

6887435, May 3, 2005

Filed:

Jun 23, 2000

Appl. No.:

09/602483

Inventors:

Melvin J. Albrecht - Columbiana County, Knox Township OH, US
Mark S. Bock - Wadsworth OH, US
Kevin J. Rogers - Wadsworth OH, US

Assignee:

The Babcock & Wilcox Company - New Orleans LA

International Classification:

B01D047/00
B01D050/00
B01F003/04

US Classification:

422172, 422168, 422169, 422170, 261116

Abstract:

An integrated air foil and ammonia injection grid provides a plurality of air foils across a flue conveying flue gas. Each air foil has a leading curved edge and a tapered, pointed, trailing end. At least one injection pipe is positioned inside each air foil, and has at least one nozzle for injecting ammonia into the flue gas flowing across the air foils. Preferably, plural injection tubes are provided and positioned one behind the other in each air foil, and each injection tube in a given air foil has a length different than a length of the other injection tubes in the same air foil. A longest injection tube in a given air foil is located furthest downstream and proximate the tapered trailing edge and a shortest injection tube in the same air foil is located furthest upstream, remaining injection tubes in the same air foil being progressively shorter the further upstream any injection tube is located. Apertures may be provided on opposed lateral sides of the air foils for introducing a gas flow into the flue gas passing across the air foils. Ammonia flow to each injection pipe may be individually controlled.