Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1986-01-23
1987-09-29
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423555, C01B 1700
Patent
active
046968040
ABSTRACT:
Here is disclosed a method for treating SO.sub.2, SO.sub.3 and a dust simultaneously which comprises causing an exhaust gas containing at least SO.sub.2, SO.sub.3 and the dust to pass through a dry dust collector in order to remove most of the dust therefrom, delivering the exhaust gas to a gas absorbing device, and using at least one of calcium hydroxide and calcium carbonate as an absorbent in the gas absorbing device to remove SO.sub.2 and the dust, which has passed through the dry dust collector, in the exhaust gas therefrom, the method being characterized by comprising the steps of blowing air into an absorbing solution fed to the gas absorbing device in order to oxidize the absorbing solution and to thereby form a gypsum therein; separating a part of the absorbing solution into a slurry mainly containing the gypsum grains and a slurry mainly containing the dust; obtaining the by-product gypsum from the slurry mainly containing the gypsum grains; adding an alkali to the slurry mainly containing the dust; spraying this slurry into the exhaust gas on the upstream side of the dry dust collector; carrying out the collection, drying and solidification of SO.sub.3 ; and collecting the resultant solid together with the dust by the dry dust collector.
REFERENCES:
patent: 3929968 (1975-12-01), Taub
patent: 4487784 (1984-12-01), Kuroda et al.
"Mitsubishi Heavy Industrial Technical Bulletin", vol. 10, No. 5, (1973), pp. 211-218.
Okino Susumu
Onizuka Masakazu
Shimizu Taku
Shinoda Naoharu
Tatani Atsushi
Heller Gregory A.
Mitsubishi Jukogyo Kabushiki Kaisha
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