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1. WO2013023116 - LOW NOX FUEL INJECTION FOR AN INDURATING FURNACE

Publication Number WO/2013/023116
Publication Date 14.02.2013
International Application No. PCT/US2012/050245
International Filing Date 10.08.2012
IPC
F23D 14/02 2006.1
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
DBURNERS
14Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
CPC
C22B 1/2413
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
1Preliminary treatment of ores or scrap
14Agglomerating; Briquetting; Binding; Granulating
24Binding; Briquetting ; ; Granulating
2413enduration of pellets
F23C 6/047
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  ; A CARRIER GAS OR; AIR 
6Combustion apparatus characterised by the combination of two or more combustion chambers ; or combustion zones, e.g. for staged combustion
04in series connection
045with staged combustion in a single enclosure
047with fuel supply in stages
F23D 14/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
DBURNERS
14Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
F23D 14/26
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
DBURNERS
14Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
26with provision for a retention flame
F23D 14/60
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
DBURNERS
14Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
46Details ; , e.g. noise reduction means
60Devices for simultaneous control of gas and combustion air
F27B 9/24
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
27FURNACES; KILNS; OVENS; RETORTS
BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
9Furnaces through which the charge is moved mechanically, e.g. of tunnel type
14characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
20the charge moving in a substantially straight path ; tunnel furnace
24being carried by a conveyor
Applicants
  • FIVES NORTH AMERICAN COMBUSTION, INC. [US]/[US] (AllExceptUS)
  • CAIN, Bruce, E. [US]/[US] (UsOnly)
  • ROBERTSON, Robert, F. [US]/[US] (UsOnly)
  • HANNUM, Mark, C. [US]/[US] (UsOnly)
  • MILLER, Todd, A. [US]/[US] (UsOnly)
  • BROWN, Joseph, P. [US]/[US] (UsOnly)
Inventors
  • CAIN, Bruce, E.
  • ROBERTSON, Robert, F.
  • HANNUM, Mark, C.
  • MILLER, Todd, A.
  • BROWN, Joseph, P.
Agents
  • SCANLON, Stephen, D.
Priority Data
13/571,42410.08.2012US
61/521,90410.08.2011US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) LOW NOX FUEL INJECTION FOR AN INDURATING FURNACE
(FR) INJECTION DE COMBUSTIBLE À FAIBLE TENEUR EN NOX POUR UN FOUR DE CONSOLIDATION
Abstract
(EN) A method delivers fuel gas to a furnace combustion chamber from a premix burner having a reaction zone with an outlet to the furnace combustion chamber. This includes the steps of injecting a premix of primary fuel gas and combustion air into the reaction zone, and combusting the premix to provide combustion products including vitiated combustion air in the reaction zone. Further steps include injecting staged fuel gas into the reaction zone separately from the premix, discharging the staged fuel gas and vitiated combustion air from the reaction zone through the outlet to the furnace combustion chamber, and combusting the staged fuel gas and vitiated combustion air in the furnace combustion chamber. This enables low NOx combustion in the furnace combustion chamber to be achieved as a result of interacting the staged fuel gas with the vitiated combustion air in the reaction zone.
(FR) L'invention concerne un procédé qui consiste à fournir un combustible gazeux à une chambre de combustion de four à partir d'un brûleur de pré-mélange ayant une zone de réaction avec une sortie donnant sur la chambre de combustion de four. Le procédé comprend les étapes d'injection d'un pré-mélange de combustible gazeux primaire et d'air de combustion dans la zone de réaction, et de combustion du pré-mélange pour fournir des produits de combustion comprenant de l'air de combustion vicié dans la zone de réaction. Des étapes supplémentaires comprennent l'injection d'un combustible gazeux étagé dans la zone de réaction de manière séparée du pré-mélange, de décharge du combustible gazeux étagé et de l'air de combustion vicié à partir de la zone de réaction, à travers la sortie et dans la chambre de combustion de four, et de combustion du gaz combustible étagé et de l'air de combustion vicié dans la chambre de combustion de four. Ceci permet d'obtenir une combustion à faible teneur en NOX dans la chambre de combustion de four, par suite de l'interaction du combustible gazeux étagé avec l'air de combustion vicié dans la zone de réaction.
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