Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1984-01-16
1987-08-18
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423240, 423555, C01B 1700, C01F 1146
Patent
active
046876499
ABSTRACT:
A flue gas desulfurization process by which gypsum can be recovered; the amount of water used therein is small, the effluent is treated in a closed system, the equipment used is minimized, and no scaling occurs; and an apparatus therefor are provided, the process including the following first process and second process: the first process comprising a cooling step of cooling and dedusting a SO.sub.2 -containing flue gas and removing acidic gases, an absorption step of contacting the cooled gas with a slurry containing limestone and lime to absorb and remove SO.sub.x and form CaSO.sub.3, a pH-adjusting step of adding H.sub.2 SO.sub.4 to the resulting slurry, an oxidation step of blowing an oxygen-containing gas in the pH-adjusted slurry to form gypsum, a step of concentrating the resulting gypsum slurry, a step of adjusting the concentration of the resulting slurry, a step of centrifugally separating gypsum, and a step of treating the effluent discharged from the cooling step, and the second process comprising, in the first process, further feeding the slurry of the absorption step to the cooling step where unreacted limestone is reacted with SO.sub.2 to form CaSO.sub.3 .
REFERENCES:
patent: 2080779 (1937-05-01), Lessing
patent: 3873672 (1975-03-01), Nishiba et al.
patent: 3935296 (1976-01-01), Morita et al.
patent: 3995006 (1976-11-01), Downs et al.
patent: 4487784 (1984-12-01), Kuroda et al.
Hashimoto Taiki
Kanda Osamu
Kuroda Hiroshi
Nishimura Masakatsu
Nishimura Tsukasa
Babcock-Hitachi Kabushiki Kaisha
Heller Gregory A.
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