METHOD FOR TREATING MERCURY IN EXHAUST GAS

The present invention is a removal system for mercury in the flue gas configured to remove Hg contained in a flue gas flowing from a boiler, and includes: a heat exchanger (AH) 18 configured to execute heat exchange for a flue gas 12 flowing from a boiler 11; a precipitator 19 configured to remove s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	NAGAYASU, TATSUTO, OKAMOTO, TAKUYA, UKAI, NOBUYUKI, KAGAWA, SEIJI, NAGAE, SHOKO
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	BLASTING CHEMISTRY COMBUSTION APPARATUS COMBUSTION PROCESSES FLUES HEATING LIGHTING MECHANICAL ENGINEERING METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES SEPARATION TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE WEAPONS
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Beschreibung
Zusammenfassung:	The present invention is a removal system for mercury in the flue gas configured to remove Hg contained in a flue gas flowing from a boiler, and includes: a heat exchanger (AH) 18 configured to execute heat exchange for a flue gas 12 flowing from a boiler 11; a precipitator 19 configured to remove soot dust in the flue gas 12; a wet SOx removal unit 21 configured to remove mercury oxide Hg 2+ in the flue gas by alkali absorbent and desulfurize sulfur oxide in the flue gas; and an HBr compound supply unit 50 configured to supply HBr, namely, a Br compound into a flue gas duct 13 configured to discharge a flue gas from a boiler outlet. Further, enrichment of bromine contained in the alkali absorbent inside the wet SOx removal unit 21 is set to predetermined enrichment or higher. With this configuration, mercury in the flue gas is stabilized in an ionic state of Hg 2+ in gypsum slurry solution discharged from the wet SOx removal unit 21.