B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
34/36
B01D 1/16 (2006.01) B01D 1/18 (2006.01) B01D 1/20 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01)
Patent
CA 1239016
-20- Abstract A spray dryer apparatus for contacting a hot gas stream containing gaseous impurities with an aqueous medium containing an absorbent for the impurities to produce a gas stream of reduced impurity content and dried powder products. The apparatus includes a chamber formed symmetrically about a vertical axis and an atomizer means located in an upper portion of the chamber for introducing a finely dispersed spray of the aqueous medium. The apparatus also includes a conduit for delivering the hot gas stream to the chamber and a gas injection means for receiving a major portion of the hot gas stream from the conduit and introducing it circumferentially about the atomizer means. The gas injection means imparts both axial and angular velocity components to the major portion of the hot gas stream whereby the hot gas stream swirls downwardly through the chamber. A key feature of the apparatus is the provision of a bypass means for withdrawing a minor portion of the hot gas stream from the conduit and a duct for introducing the withdrawn minor portion of hot gas into the chamber at a tangent to a radius extending from the vertical axis and in a substantially horizontal plane. An essential feature of the invention is that the minor portion of the hot gas is introduced into the chamber in a direction counter to the direction of swirl of the major portion of the hot gas passing downwardly through the chamber. Preferably from about 5 to 25 vol. % of the hot gas stream containing gaseous impurities is withdrawn and bypasses the gas injection means, and is introduced into a lower portion of the chamber in a direction counter to the direction of swirl of the major portion of gas which passes downwardly through the chamber.
453046
Bevilaqua Paul M.
Stachura Stanley J.
Ridout & Maybee Llp
Rockwell International Corporation
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