WET TYPE FLUE GAS DESULFURIZING APPARATUS AND METHOD

PROBLEM TO BE SOLVED: To provide a wet type flue gas desulfurizing apparatus and a method, by which used water amount in a desulfurization absorption tower can be effectively decreased without increasing salts concentration in desulfurization absorption liquid in a wet type flue gas desulfurization...

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Bibliographische Detailangaben
Hauptverfasser: ISHIZAKA HIROSHI, KATAGAWA ATSUSHI, OMINE SHIGETO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a wet type flue gas desulfurizing apparatus and a method, by which used water amount in a desulfurization absorption tower can be effectively decreased without increasing salts concentration in desulfurization absorption liquid in a wet type flue gas desulfurization system of a limestone-gypsum method.SOLUTION: In a gas cooler 21 which has a humidifying function and is installed at an upstream position of an absorption tower body 1 of the wet type flue gas desulfurizing apparatus, steam is produced from water-containing fluid flowing in the gas cooler 21 by utilizing heat of high temperature exhaust gas, steam separated by a steam separator 19 is mixed with the exhaust gas at a rear stream side of the gas cooler 21 to effectively attain reduction of exhaust gas temperature and humidification by execution at the same time. Since humidification is also carried out at the same time, amount of evaporated water in the desulfurization absorption tower can be further reduced even with the same exchange calorie. Even when liquid essentially consisting of water of high salt concentration is used as a heating medium, salts is not mixed in the desulfurization absorption liquid and consequently desulfurization performance is not reduced.