Mitsubishi Heavy Industries Limited

Shoichi Onishi

Susumu Okino

Toru Takashina

Naohiko Ukawa

Kazuaki Kimura

Koichiro Iwashita

Shigeo Hasegawa

Toyoshi Nakagawa

Atsushi Yoshioka

Yoshimitsu Kawanishi

This invention relates to a flue gas treating process including a heat recovery step for recovering heat from flue gas by means of a heat exchanger (,) and thereby cooling the flue gas, and a subsequent absorption step for bringing the flue gas into gas-liquid contact with an absorbing fluid (D) in absorption towers (,) so as to remove at least SO,present in the flue gas by absorption into the absorbing fluid (D), which is characterized, for example, in that a powder addition step for spraying a powder collectable in the absorption step into the flue gas is provided prior to the heat recovery step. This invention makes it possible to provide a flue gas treating process in which a countermeasure against SO,present in flue gas can be easily achieved without resorting to ammonia injection and the flue gas can further be purified without the disadvantage of causing the injected substance to remain in the treated flue gas.

Flue gas treating process and system

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Kobe, Japan

Shoichi Onishi