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1. (WO2018041851) SCR-SYSTEM FOR REMOVING ASH FROM A FLUE GAS STREAM GENERATED IN A COMBUSTION SYSTEM

Pub. No.:    WO/2018/041851    International Application No.:    PCT/EP2017/071688
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Aug 31 01:59:59 CEST 2017
IPC: F23J 3/04
F23J 15/02
B01D 46/12
Applicants: YARA INTERNATIONAL ASA
Inventors: RYBA, Manfred
BORS, Walter
SZLAPA, Mateusz
Title: SCR-SYSTEM FOR REMOVING ASH FROM A FLUE GAS STREAM GENERATED IN A COMBUSTION SYSTEM
Abstract:
The invention relates to an SCR (selective catalytic reduction)-system for a combustion system having a combustion chamber and an arrangement of ducts in connection with the combustion chamber for conduction of a flue gas stream to an outlet, at least one duct being essentially vertically disposed, which SCR-system comprises an SCR-unit comprising at least one SCR-reactor module for reducing an amount of NOx in the flue gas stream, configured for operative and fitting placement within the vertical duct, and a filtering screen unit comprising at least one filtering screen for filtering-out ash particles from the flue gas stream prior to entry into the SCR-unit, configured to protectively cover the SCR-unit, wherein at least one through-passage is provided within or along an outer edge of the SCR-unit such that the flue gas stream bypasses the SCR-unit, the at least one filtering screen is disposed inclined with respect to a horizontal plane, and the at least one through-passage and the at least one filtering screen are configured for arrangement in the vertical duct such that at least part of the filtered-out ash slides downwards across the filtering screen and passes through the through-passage. The invention furthermore relates to a combustion system comprising such an SCR-system and a method for retroactively fitting such an SCR-system exclusively within the vertical duct.