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An apparatus for treating particulate material has a process chamber for receiving and treating the material. A bottom is composed of a plurality of overlapping guide plates which are placed one above the other and between which annular slots for process air to pass through are formed. An annular-ga

An apparatus for treating particulate material has a process chamber for receiving and treating the material. A bottom is composed of a plurality of overlapping guide plates which are placed one above the other and between which annular slots for process air to pass through are formed. An annular-gap nozzle is arranged centrally in the bottom, the orifice of this annular-gap nozzle being designed in such a way that a planar spray pancake which runs approximately parallel to the bottom plane can be sprayed.

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What is claimed is: 1. An apparatus for treating particulate material, comprising: a process chamber which is intended for receiving and treating a material, said process chamber having a horizontal bottom which is composed of a plurality of overlapping annular guide plates, which are placed one ab

What is claimed is: 1. An apparatus for treating particulate material, comprising: a process chamber which is intended for receiving and treating a material, said process chamber having a horizontal bottom which is composed of a plurality of overlapping annular guide plates, which are placed one above the other and between which overlapping annular guide plates annular slots are formed, via which annular slots a process air having an essentially horizontal component motion directed radially outward can be introduced into said process chamber, and an annular-gap nozzle being arranged centrally in said bottom, an orifice of said annular-gap nozzle having orifice gaps oriented in such a way that they spray approximately horizontally with a looping angle of 360° such that a planar spray pancake which runs approximately parallel to a bottom plane can be sprayed, a central feed for a substance arranged above said annular-gap nozzle, said feed having a discharge orifice arranged above said annular-gap nozzle, wherein said feed and said discharge orifice can be adjusted vertically. 2. The apparatus of claim 1, wherein discharge openings are provided between said orifice of said annular-gap nozzle and said bottom disposed underneath of said orifice, said discharge openings serving for discharging a support air in order to effect a support cushion on an underside of said spray pancake. 3. The apparatus of claim 2, wherein said support air discharged from said discharge openings is provided from said annular-gap nozzle. 4. The apparatus of claim 2, wherein said support air discharged by said discharge openings is provided by said process air. 5. The apparatus of claim 2, wherein said support air discharged from said discharge openings is provided from said annular-gap nozzle and by said process air. 6. The apparatus of claim 1, wherein said annular-gap nozzle has an approximately conical head, and wherein said orifice of said annular-gap nozzle runs along a circular circumferential line of said conical head. 7. The apparatus of claim 6, wherein a frustoconical wall is disposed between said orifice of said annular-gap nozzle and said bottom lying underneath, said frustoconical wall having openings for discharging a support air for supporting said planar spray pancake. 8. The apparatus of claim 7, wherein an annular slot for passing process air is formed at an underside of said frustoconical wall. 9. The apparatus of claim 1, wherein guide elements are arranged between said annular guide plates, said guide elements additionally imposing a flow component on said process air passing through said guide plates. 10. The apparatus of claim 1, wherein said orifice of said feed lies exactly coaxially above the annular-gap nozzle. 11. The apparatus of claim 1, wherein a solid is introduced through said feed. 12. The apparatus of claim 1, wherein said solid can be a powder.