초록 ▼

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 vertica

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, 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. The apparatus provides a bypass means for withdrawing a minor portion (about 5 to 25 vol. %) of the hot gas stream from the conduit and a duct for introducing the withdrawn minor portion of hot gas into the chamber at a tangent to a radius extending from the vertical axis and in a substantially horizontal plane.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.

대표청구항 ▼

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 dry powder products, said apparatus comprising: a chamber formed symmetrically about a verti

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 dry powder products, said apparatus comprising: a chamber formed symmetrically about a vertical axis; atomizer means located in an upper portion of said chamber for introducing a finely dispersed spray of said aqueous medium; conduit means for delivering said hot gas stream to said chamber; gas injection means for receiving a major portion of said hot gas stream from said conduit means and introducing it circumferentially about said atomizer means, said gas injection means imparting both axial and angular velocity components to said major portion of said hot gas stream whereby said hot gas stream swirls downwardly through said chamber; bypass means for withdrawing a minor portion of said hot gas stream from said conduit means; and duct means for introducing said withdrawn minor portion of said hot gas stream into said chamber at a tangent to a radius extending from said vertical axis, in a substantially horizontal plane and in a direction counter to the direction of swirl of said major portion of said hot gas stream passing downwardly through said chamber. A method of treating 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 dry powder products comprising: introducing said aqueous medium into a chamber formed symmetrically about a vertical axis, said aqueous medium being introduced as a finely dispersed spray into an upper portion of said chamber; introducing a major portion of the hot gas stream containing gaseous impurities into said chamber and circumferentially about said finely dispersed spray, said major portion of hot gas being introduced in a downwardly descending swirl through said chamber; and introducing a minor portion of the hot gas stream into said chamber about the periphery thereof, at a tangent to a radius extending from said vertical axis, in a substantially horizontal plane and in a direction counter to the direction of swirl of the major portion of hot gas passing through said chamber.