Method for the purification of waste gas containing gaseous pollutants
AssigneeTaiyo Kaken Company, Ltd.
InventorsHeiichiro Murakami, Tsuneo Okamoto
Life of this patent
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Abstract
In a process for the purification treatment of a waste gas containing gaseous pollutants, including the steps of upwardly introducing the waste gas into the bottom of a tower a multiplicity of stepped trays and at the same time introducing an activated carbon into the top of the tower, allowing the waste gas and the activated carbon to come into contact to form a fluidized bed each on the stepped trays, thereby causing the gaseous pollutants in the waste gas to be adsorbed on the activated carbon the waste gas can be continuously purified by recycling the activated carbon spheres and adopting, as the stepped trays, perforated plates of a specific design.
Claims19
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of:
- providing a tower having an absorbing section containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both of said zones being provided with a plurality of apertures, the total area of the apparatus of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height;
- continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section;
- continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon spheres forming a fluidized bed in zone I of each tray and descending through zone II to the next lower tray;
- and
- continuously removing purified gas from the top of said tower.
A method for the continuous purification of a waste gas containing gaseous pollutants, comprising the steps of:
- providing a tower having an adsorbing section containing a plurality of vertically spaced trays, each of said trays being divided by at least one weir into first and second zones, each zone having a plurality of apertures, each first zone having 80-95% of the total surface area of the tray and a total aperture area 4-20 times the total aperture area in said second zone,
- continually introducing the gas to be purified into a lower section of the tower beneath said adsorption section;
- continuously feeding activated carbon spheres onto the top tray of said tower, said carbon spheres and said gas coming into countercurrent contact, said carbon forming a fluidized bed in said first zone of each tray and descending through said second zone to the next lower tray;
- and
- continuously removing purified gas from the top of said tower.
A chemical process column containing a plurality of vertically spaced trays, said trays being of two types, alternately arranged, a first type of said trays having at least one weir provided on its surface disposed to divide its surface area into a central zone I and a distal zone II, said central zone I having 80-95% of the total surface area of said first type tray, both said first tray sections being provided with a plurality of apertures, the total area of the apertures of said central zone I equaling 4-20 times the total area of apertures in said distal zone II, the second type of tray being provided with at least one weir disposed to divide the tray into a central zone II and a distal zone I, said central zone II having 5-20% of the total surface area of said second type tray, both zones of said second type tray being provided with a plurality of apertures, the total aperture area of said distal zone I equaling 4-20 times that of the total aperture area of said central zone II, the weir provided on said first type of tray and the weir provided on said second type of tray being equal in height.
Dependencies are inferred from the claim text.