EP 2574841 A2 20130403 - Method for reducing nitrogen oxide emissions and corrosion in a bubbling fluidized bed boiler and a bubbling fluidized bed boiler
Title (en)
Method for reducing nitrogen oxide emissions and corrosion in a bubbling fluidized bed boiler and a bubbling fluidized bed boiler
Title (de)
Verfahren zur Reduzierung von Stickstoffoxidemissionen und Korrosion in einem Kessel mit stationärer Wirbelschicht und Kessel mit stationärer Wirbelschicht
Title (fr)
Procédé pour réduire les émissions d'oxyde d'azote et la corrosion dans une chaudière à lit fluidisé bouillonnant et chaudière à lit fluidisé bouillonnant
Publication
Application
Priority
FI 20115962 A 20110930
Abstract (en)
To reduce nitrogen oxide emissions and corrosion in a bubbling fluidized bed boiler that burns biofuel or waste, air is supplied into the boiler furnace (1) in stages so that two sub-stoichiometric combustion zones (I), (II) and a superstoichiometric zone (III) are brought about. The first combustion zone (I) begins from the height level of primary air supply nozzles (3) and it extends above the fluidized bed (2), ending under the height level (hS) of secondary air nozzles (6). The second combustion zone (II) begins from the height level (hS) of the secondary air nozzles (6) and ends under the height level (hT) of tertiary air nozzles (7). The third combustion zone (III) begins from the height level (hT) of the tertiary air nozzles. The length of the first combustion zone (I) is optimized by placing the secondary air nozzles (6) at a height (hS) from the top surface of the fluidized bed (2), which height (hS) is chosen according to a given calculation formula and calculated according to furnace-specific variables, reference values and design point-specific variables. The design point-specific variables are different in a boiler with a high furnace load and in a boiler with a low furnace load.
IPC 8 full level
F23C 10/00 (2006.01); F23G 5/30 (2006.01); F27B 15/00 (2006.01); F27B 15/02 (2006.01); F27B 15/10 (2006.01)
CPC (source: EP FI)
F23C 10/00 (2013.01 - EP); F23C 10/20 (2013.01 - FI); F23G 5/14 (2013.01 - EP); F23G 5/30 (2013.01 - EP); F23L 9/02 (2013.01 - EP); F27B 15/00 (2013.01 - EP); F27B 15/02 (2013.01 - EP); F27B 15/10 (2013.01 - EP); F23G 2203/502 (2013.01 - EP); F23G 2207/30 (2013.01 - EP)
Citation (applicant)
WO 2006084954 A1 20060817 - KVAERNER POWER OY [FI], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2574841 A2 20130403; EP 2574841 A3 20140226; FI 125314 B 20150831; FI 20115962 A0 20110930; FI 20115962 A 20130331
DOCDB simple family (application)
EP 12397524 A 20120926; FI 20115962 A 20110930