(19)

(11)

EP 0 521 024 A1

(12)

(43) Date of publication: 07.01.1993 Bulletin 1993/01 (21) Application number: 91905826.0 (22) Date of filing: 20.03.1991

(51) International Patent Classification (IPC):  F23D 14/ 04( . ) (86) International application number: PCT/GB1991/000427 (87) International publication number: WO 1991/014901 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 23.03.1990 GB 19900006616 (71) Applicant: BRAY BURNERS LIMITED Leeds LS7 2AN (GB)	(72) Inventor: CAFFERTY, Michael Wetherby LS22 4SF (GB) (74) Representative: Denmark, James  Bailey, Walsh & Co. 5 York Place Leeds LS1 2SD Yorkshire Leeds LS1 2SD Yorkshire (GB)