Device for feeding pulverulent material

Claim 1

In a device for treatment of pulverulent dry material with gases, means forming a treatment chamber, means forming an annular distribution chamber for the material above said treatment chamber and having a bottom with an annular slot therein providing communication with said treatment chamber, a circular partition extending upwardly part way into said distribution chamber along the outer edge of said slot to form an overflow means to said slot, supply conduits opening into said distribution chamber, a plurality of substantially horizontal nozzles arranged tangentially to said distribution chamber along its outer circumference adjacent the bottom thereof for introduction of streams of compressed gases tangentially into said distribution chamber, a vertically disposed main gas discharge pipe extending with its lower end centrically into the upper portion of said treatment chamber, another gas discharge pipe surrounding said main gas pipe in spaced concentrical relation and also extending with its lower end into said treatment chamber, a blower having an inlet and an outlet, pipe means connecting the upper end of said other gas discharge pipe with the inlet of said blower, additional pipe means connecting the outlet end of said blower with said nozzles, and a frustoconical deflection shield attached to the outer circumference of said other gas discharge pipe in a position spaced below said annular connection slot.