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 , 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 , 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 consists of at least one radial compressor and preferably of a radial compressor with downstream piston compressor , and the first compressor device 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 , 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 , 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 consists of at least one radial compressor and preferably of a radial compressor with downstream piston compressor , and the first compressor device 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 . <EOS>