초록 ▼

In a spray drying device with a drying chamber and at the bottom thereof a fluidized bed, which is maintained on a perforated plated, the fluidized layer is divided by means of separation means into two zones, of which only one is supplied with particles from the spray drying chamber, whereas the se

In a spray drying device with a drying chamber and at the bottom thereof a fluidized bed, which is maintained on a perforated plated, the fluidized layer is divided by means of separation means into two zones, of which only one is supplied with particles from the spray drying chamber, whereas the second zone is substantially supplied with particles only from the first zone and is designed for treatment of the particles while they pass through the zone in a flow without substantial back mixing. The device makes it possible to manufacture a product which without after-treatment, is substantially dustless and has the desired particle size distribution, degree of dampness and surface treatment. Furthermore, an improved exploitation of energy is achieved.

대표청구항 ▼

A spray drying device comprising a drying chamber (1) with at least one fluid spraying means (2) and means (5) for introducing drying air into the chamber as a flow around the spraying means, said drying chamber having a conically downwards tapering section and at the bottom a perforated plate (9,21

A spray drying device comprising a drying chamber (1) with at least one fluid spraying means (2) and means (5) for introducing drying air into the chamber as a flow around the spraying means, said drying chamber having a conically downwards tapering section and at the bottom a perforated plate (9,21) and means for producing an upwardly directed air flow through the perforations of the plate for maintaining a fluidized particle layer on top of the plate, characterized in that the fluidized particle layer is divided by separation means (12,24) into at least two zones comprising a first zone (13,22), in which moist particles created in the drying chamber (1) are absorbed, said first zone being adapted to full and permanent particle mixing, and a second zone (14,23) which is shielded from the drying chamber (1) such that it is not supplied directly therefrom and which is connected with means (15) for introducing particles therein from said first zone (13,22) and with means (17) for removal of particles from said second zone, said means for introducing particles (15) and said means (17) for removal of particles being mutually arranged in such a way that the particles pass the second zone (14,23) without substantial backmixing.