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1. (WO2018141556) APPARATUS AND METHOD FOR PROTECTING THE TUBE-SHEET OF A SYNGAS LOOP BOILER

Pub. No.:    WO/2018/141556    International Application No.:    PCT/EP2018/051193
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Fri Jan 19 00:59:59 CET 2018
IPC: F28F 9/02
F28F 9/18
F28F 19/06
F28F 21/08
F28D 7/06
F28D 21/00
Applicants: ALFA LAVAL CORPORATE AB
Inventors: COLOMBO, Marco
SARTI, Silvio
Title: APPARATUS AND METHOD FOR PROTECTING THE TUBE-SHEET OF A SYNGAS LOOP BOILER
Abstract:
A syngas loop boiler (10) comprises a casing (12) that surrounds a tube bundle (14), wherein the tube bundle (14) comprises a plurality of tubes (16). One end of each of the tubes (16) is joined to a tube-sheet (18) provided with corresponding tube-sheet inlet holes (20) for inletting the syngas in the boiler (10), wherein each tube-sheet inlet hole (20) is internally provided with at least a protective sleeve (22) welded at both ends to corresponding surfaces of the tube-sheet inlet hole (20). Each tube-sheet inlet hole (20) is provided with a first respective weld overlay (24A) placed at the inlet mouth of the tube-sheet inlet hole (20), so that a first end of each protective sleeve (22) is welded to the first weld overlay (24A). Each tube-sheet inlet hole (20) is internally provided with at least a bore groove (26) that contains a respective in-bore second weld overlay (24B), so that the second end of the protective sleeve (22) is welded to the in-bore second weld overlay (24B). Each protective sleeve (22) is thus welded at both ends to respective weld overlays (24A, 24B), with the possibility of removal and re-installation without performing any post weld heat treatment.