(19)

(11)

EP 4 222 417 A1

(12)

(43) Date of publication: 09.08.2023 Bulletin 2023/32 (21) Application number: 21777437.1 (22) Date of filing: 09.09.2021

(51) International Patent Classification (IPC):  F23C 10/28(2006.01) F23N 5/24(2006.01) F22B 35/18(2006.01) F23N 5/02(2006.01) F22B 35/00(2006.01) (52) Cooperative Patent Classification (CPC): F23C 10/28; F23N 5/242; F23N 5/022; F23N 2223/48; F23N 2223/40; F23N 2223/06; F23N 2225/19; F23N 2225/21; F23N 2225/10; F23N 2237/10; F23N 2223/50; F23N 2223/10; F22B 35/18; F22B 35/008 (86) International application number: PCT/EP2021/074838 (87) International publication number: WO 2023/036426 (16.03.2023 Gazette 2023/11)

(84) Designated Contracting States: 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 States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Sumitomo SHI FW Energia Oy 02130 Espoo (FI)	(72) Inventors: KETTUNEN, Ari 79100 Leppävirta (FI) MIETTINEN, Jouni 78500 Varkaus (FI) (74) Representative: Genip Oy  Heikinkatu 7 48100 Kotka 48100 Kotka (FI)