Apparatus for drying moist products that are capable of trickling, having - a container which is provided with an inlet opening for feeding of moist products capable of trickling and with an outlet opening for removal of dried products capable of trickling, - a first heat-transfer device within the container, which first heat-transfer device is flowed through by heating steam, - a conveying device for conveying from the inlet opening to the outlet opening products capable of trickling, - a heating-steam feed line and a heating-steam discharge line for the first heat-transfer device, - an exhaust-steam line for the container, wherein the apparatus has an expansion vessel which is connected to the heating-steam discharge line and which is connected on the one hand to a first compressor device (10, 11), which is connected to the heating-steam feed line, and on the other hand to an evaporator device, wherein the evaporator device is likewise connected to the first compressor device (10, 11), and wherein, with interposition of a second compressor device, the exhaust-steam line of the container is likewise connected to the evaporator device, characterized in that a filter device is arranged between the container and the second compressor device, and the first heat-transfer device is designed as a tube bundle with a multiplicity of tubes that are flowed through by heating steam, wherein the first heat-transfer device is preferably arranged rotatably in the container, and the first compressor device (10, 11) consists of at least one radial compressor and preferably of a radial compressor with downstream piston compressor, and the first compressor device (10, 11) is configured to compress, and in the process to heat, steam from the expansion vessel and steam from the evaporator device, so that the steam which is formed and the conventionally generated heating steam are able to be mixed with one another via a regulating valve, wherein the heating-steam pressure required for the drying is settable via the regulating valve. - a container which is provided with an inlet opening for feeding of moist products capable of trickling and with an outlet opening for removal of dried products capable of trickling, - a first heat-transfer device within the container, which first heat-transfer device is flowed through by heating steam, - a conveying device for conveying from the inlet opening to the outlet opening products capable of trickling, - a heating-steam feed line and a heating-steam discharge line for the first heat-transfer device, - an exhaust-steam line for the container, the apparatus has an expansion vessel which is connected to the heating-steam discharge line and which is connected on the one hand to a first compressor device (10, 11), which is connected to the heating-steam feed line, and on the other hand to an evaporator device, wherein the evaporator device is likewise connected to the first compressor device (10, 11), and wherein, with interposition of a second compressor device, the exhaust-steam line of the container is likewise connected to the evaporator device, characterized in that a filter device is arranged between the container and the second compressor device, and the first heat-transfer device is designed as a tube bundle with a multiplicity of tubes that are flowed through by heating steam, wherein the first heat-transfer device is preferably arranged rotatably in the container, and the first compressor device (10, 11) consists of at least one radial compressor and preferably of a radial compressor with downstream piston compressor, and the first compressor device (10, 11) is configured to compress, and in the process to heat, steam from the expansion vessel and steam from the evaporator device, so that the steam which is formed and the conventionally generated heating steam are able to be mixed with one another via a regulating valve, wherein the heating-steam pressure required for the drying is settable via the regulating valve.