A method of controlling nitrous oxide in circulating fluidized bed steam generators

(19)

(11)

EP 0 851 173 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	28.07.1999 Bulletin 1999/30

(43)	Date of publication A2:
	01.07.1998 Bulletin 1998/27

(21)	Application number: 97122925.7

(22)	Date of filing: 29.12.1997

(51)	International Patent Classification (IPC)⁶: F23C 11/02, F23C 6/04

(84)	Designated Contracting States:
	AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

30.12.1996 US 774763

(71)	Applicant: COMBUSTION ENGINEERING, INC.
	Windsor CT 06095 (US)

(72)	Inventors:
	Schmidt, Peter Bolton, Connecticut 06043 (US) Tanca, Michael Chris Tariffville, Connecticut 06081 (US)

(74)	Representative: Rupprecht, Klaus, Dipl.-Ing. et al
	c/o ABB Patent GmbH, Postfach 10 03 51 68128 Mannheim 68128 Mannheim (DE)

(54)	A method of controlling nitrous oxide in circulating fluidized bed steam generators

(57) A method of controlling N₂O emissions from a circulating fluidized bed steam generator (CFB) (2) while concomitantly therewith maintaining acceptable levels of NO_x emissions and SO_x emissions from the circulating fluidized bed steam generator (CFB) (2), by increasing the temperature of the combustion gases (32) prior to their discharge from cyclone exit (8a) and at the same time lowering their temperature at the furnace exit (4c).

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