Method for the combustion of fuel by stepped fuel feed and burner for use with it

(19)

(11)

EP 0 430 376 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	15.01.1992 Bulletin 1992/03

(43)	Date of publication A2:
	05.06.1991 Bulletin 1991/23

(21)	Application number: 90203134.3

(22)	Date of filing: 27.11.1990

(51)	International Patent Classification (IPC)⁵: F23C 6/04, F23C 9/00

(84)	Designated Contracting States:
	DE FR GB IT NL

(30)

Priority:

01.12.1989 NL 8902963

(71)	Applicant: INTERNATIONAL FLAME RESEARCH FOUNDATION
	NL-1970 CA Ijmuiden (NL)

(72)	Inventor:
	Knill, Kevin James Waterloo, Ontario, N2L 4VZ (CA)

(74)	Representative: Wentzel, Hendrik Cornelis et al
	Hoogovens Corporate Services BV, Industrial Property Department, P.O. Box 10000 NL-1970 CA IJmuiden NL-1970 CA IJmuiden (NL)

(56)

References cited: :

(54)	Method for the combustion of fuel by stepped fuel feed and burner for use with it

(57) To lower NO_x production in a stepped fuel feed combustion method, secondary fuel (15) is injected into a combustion chamber as a jet through an internal recirculation zone of the primary combustion zone (6) to a secondary combustion zone (8). The stoichiometry of the system up to and including the secondary combustion zone is preferably 0.70 to 0.90. A burner adapted for such a method is also disclosed, which has a duct for secondary fuel (15) concentrically within an inner annular duct (13) for primary fuel and an outer annular duct (14) for primary air.

Search report