CS202027B2 - Apparatus for contacting the dried substance with the drying medium - Google Patents

Abstract

1427412 Evaporation E H CARLSSON 31 Aug 1973 [1 Sept 1972] 41192/73 Heading BIB [Also in Divisions F3 and F4] An apparatus for contacting a first material such as a liquid, semi-solid or solid material, with a second substance, such as a drying gas, comprises a container 6 having a bed 27 of a plurality of spherical contact bodies which, in use, circulated through the container by a centrally disposed screw 16. The path of the bodies in a downward direction comprises a material application zone in which the first substance is applied to the contact bodies, a main treatment zone located in the upper part of the bed, a peripheral point of introduction of the second substance, a final treatment zone and a separating zone located beneath the bed for separating processed material from the contact bodies from Which the screw conveyor 16 takes the bodies. The screw 16 is surrounded by a rotatable sleeve 21 to form a screw conveyor and the conveyor has associated therewith a material application means and separation means, the latter comprising infeed arms 28 for feeding the contact bodies and material from the lowermost part of the abed to a gap formed by an inner separation rotor 29 and an outer stationary separation stator 31 concentric with the rotor 29. Disposed beneath the gap is a perforated separation bottom 33 through which processed material separated from the contact bodies passes. The infeed arms 28 may be of spiral configuration (Fig. 3, not shown) and the rotor 29 and stator 21 may be provided with plates 30, 32 respectively. As shown the material application means comprises a bowl 20 attached to the sleeve 21 and to which material is fed from a conduit(s) 17 by a planar receiver 19 and to which the bodies are fed by the conveyor 16, the material, in this case being a liquid. The material coated bodies are then urged from the bowl by a pair of spiral arms 25 on to spreading arms 26 from whence they drop out of the bed 27. The screw 16, receiver 19 and arms 25 are rotated by a motor 15 and the sleeve 21 by a motor through a chain 23 and sprocket 22 drive. If the material is a semi-solid or paste-like material it is fed by a screw-conveyor through the upper part of the shaft of the screw (16) and then through the wall thereof into the stream of bodies, mixing arms being provided, are fixed to the screw shaft and the other to the sleeve (21) (Fig. 4, not shown). Various materials may be fed through the upper part of the screw shaft and from there into the stream of bodies surrounding the shaft (Fig. 8, not shown). For fibrous or solid material one or more rotating carriages may be provided, each carriage having at its lower end a tapered slot co-operating with a frusto-conical spreading roller (Figs. 5 to 7, not shown). Each carriage may have two or more spreading rollers. For a chip material the chips are fed downwardly directly onto the bodies emerging from the top of the sleeve (21) whence the mixtures is fed by arms rotating with the screw and discharge passages rotating with the sleeve (Fig. 9, not shown). A passage 34 for cooling gas may be provided at the gap.

Description

The invention relates to an apparatus for contacting a dried substance with a drying agent, for example a semi-solid or solid material with a drying gas, i.e. essentially an oven, similar to that of British Patent Specification No. 1 265 719.

British Patent Specification No. 1,265,719 discloses a new and high performance dryer. This dryer has a very wide field of application, which includes particularly the drying or thickening of liquid, semi-solid and solid materials. However, this field of application is not limited to separate drying, but also includes contact between two liquids or substances, for example liquid-gas contact, gas-to-gas contact and chemical-liquid contact. This also applies to the field of application of the dryer of the present invention, which should not be forgotten in the following interpretation of the invention with respect to the drying of liquid, semi-solid and solid materials. The prior art device does not allow efficient feeding of material for drying and efficient separation of finished material. Also, the processing of materials of significantly different structures and densities in one and the same dryer has not been possible without significant variations of the individual devices.

The shortcomings of the prior art are

20 2 7 are now removed by the apparatus for contacting the dried substance, such as liquid semi-solid or solid material, with a desiccant such as gas, the apparatus having a baseplate of a large number of spherical contact bodies which are guided through the tank in circulation. a path having, in said sequence, a discharge region of the material in which the substance to be dried is carried onto the contact bodies, a main drying region lying at the top of the bed, a peripherally arranged drying agent supply location, a drying region laid in a bottom portion of the base bed, and underneath the base bed a separating region for separating the finished material from the contact bodies, the separating region having a perforated bottom that permits the finished material but retains the contact bodies for their return guiding into the material discharge area by means of a centrally located conveyor which surrounds the sleeve extending in a direction. downwardly against a perforated bottom according to the invention, characterized in that the sleeve surrounding the screw conveyor is rotatable relative to the screw conveyor, that the material discharge area has discharge members which are rotatably positioned at the upper end of the screw conveyor and circulating with the rotary sleeve of the screw conveyor have scattering arms mounted, that the screw conveyor has at its lower end separating members which consist of rotatable feed arms which are mounted on the rotary housing of the screw conveyor for circulating and transferring the contact bodies from the lowest part of the bed to the gap inside and below the feed arms wherein the gap is formed from an internal separating rotor which is connected to a shaft of a co-rotating worm conveyor and from an external stationary separating stator that is with an internal separation flange under the gap.

In order to improve the separation of the finished material from the contact bodies, the separator rotor of the rotor plate and the separator stator of the stator plate protrude into the gap.

In the treatment of a material which tends to become sticky when heated, the gap around its upper periphery is provided with a gas supply channel.

For the treatment of liquid material by gas, the dispensing members consist of a dampening vessel arranged on and arranged around the rotatable housing, of a rotatable liquid collector connected to the screw conveyor shaft, which liquid collector extends down into the wetting vessel for introducing the substance to be dried. rotating spiral arms connected to the shaft of a screw conveyor for circulating and moving the contact bodies against the outer edge of the moistening vessel and rotating diffusion arms connected to the outer periphery of the moistening vessel extending to the outer wall of the bowl for dispersing the contacting bodies coming from the moistening vessel through the underlying bed in the tank.

The liquid collector consists of a collecting vessel arranged around the shaft of the screw conveyor and of outlet pipes extending downwardly from the collecting vessel.

According to a further feature, the substance discharge members consist of feeders of the substance to be dried through the upper hollow part of the screw conveyor shaft to the distribution pipes provided on the lower part of the upper hollow part and of the first and second mixing arms arranged on the upper parts of the first material worm conveyor discharged from the manifolds with the contact bodies, from the moistening vessel disposed on and extending around the rotating sleeve, from the spiral arms connected. with the screw conveyor shaft and extending into the humidifying vessel, from the manifolds connected to the humidifying vessel, and from a circular lid enclosing the humidifying vessel extending from the screw conveyor shaft to the manifolds.

A particularly preferred embodiment is that the feeders consist of an auxiliary screw conveyor which is located in the upper hollow part of the screw conveyor shaft and the first and second mixing arms are located on the upper part of the screw conveyor shaft or the sleeve.

For processing the rigid material, the dispensing members consist of a dampening vessel disposed around and extending around the swiveling sleeve, rotating diffuser arms connected to the outer periphery of the dampening vessel and extending to the outer wall of the distribution body of the contact bodies coming from the dampening vessel. a container through a bed in the tank, from a spreading trolley for the substance to be dried, placed between the outer edge of the dampening vessel and the wall of the tank, as well as above the underlying bed, the spreading trolley having an opening in the bottom and rotatable therein a conical spreading cylinder, in order to rotate around the center of the tank along the path above the bed, preferably in front of the dispersion arm when viewed in the direction of rotation.

For processing the material that is chopped into pieces by gas, the dispensing members consist of, distribution pipes disposed on the upper part of the screw conveyor on a rotating sleeve, a discharge spiral arms disposed on the upper part of the screw conveyor for dispensing the material it is necessary to dry, and the contact bodies through the distribution pipes, from a cylindrical around the highest part of the worm conveyor shaft of the disassembling lid, located above the distribution pipes and the discharge spiral arms having an insertion arm for the fabric to be dried and inserting the substance to be dried into an insertion space surrounded by a lid.

The apparatus according to the invention allows efficient feeding of material for drying and no less efficient separation of the finished material. The invention thus makes it possible to process materials of significantly different densities and structures in one and the same dryer, with only minor variations. This has not yet been possible. The design of the dryer according to the invention also allows satisfactory and reliable operation of very large apparatuses. AND

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an apparatus with an apparatus for contacting a dried substance with the desiccant of the present invention; FIG. 2 is a vertical sectional view of the apparatus of the present invention; Fig. 3 is a cross-sectional view of the apparatus of Fig. 2 taken along line III-III of Fig. 2, Fig. 4 is an axial section of a portion of the apparatus of the invention with a feeder for semi-solid material, dried; Fig. 6 is a side elevational view and Fig. 7 is a cross-sectional vertical section of the solid material feeder; Fig. 8 a vertical axial section of another embodiment of the apparatus according to the invention with feeders for semi-solid and viscous material; with feeders for finely chopped material.

Drying apparatus in the embodiment shown in FIG. 1 has a fan 2, driven by the first motor 1 and connected to the main pipe 3, the air filter 4 and the heat exchanger 5 _in which the air circulating through the main pipe 3 may be heated to a suitable temperature. The heat exchanger 5 can be switched off if a highly sensitive material is to be treated, so that air at or below room temperature then flows through the main pipe 3 into the tank 6 of the drying device according to the invention. For this purpose, the main tube 3 is connected to a peripheral duct 7 arranged around the tank 6 and connected to its interior. The lower part of the tank 6 is connected via a first tube 8 to a series of cyclones 9 which, in the case of a dried substance to be extracted from the liquid, as in the drying device shown, separates the dry substance from the drying air escaping into the atmosphere via the air tube 10 and the suction fan 12 driven by the second motor 11. The drying air, saturated with the vapor from the liquid, also leaves the tank 6 through the second tubes 13.

If a completely closed system is required or necessary, for example to treat very odorous or toxic substances, the drying air or gas leaving the tank 6 via the second tubes 13 is recirculated to the fan 2 as shown in Fig. 1.

The drying apparatus of FIG. 2 is similar to the dryer design of British Patent Specification No. 1,265,719, and the details common to both apparatuses, such as contact bodies, will be briefly described. In addition, the drying apparatus of FIG. 2 will be described with respect to gas drying of the liquid.

The drying device according to the invention has a tank 6 with a plurality of spherical contact bodies 14, in particular of plastic materials. A screw conveyor 16, driven by a third motor 15, is arranged in the middle of the tank 6 and serves to move the contact bodies 14 from the bottom of the tank 6 to its upper part. During the process, the contact bodies 14 are continuously moved by the screw conveyor 16 upwardly within the middle part of the tank 6 and fall down by gravity along the wall of the tank 6 that surrounds the intermediate part with the screw conveyor 16. The material to be dried is fed once or several feed tubes 17 to the top of the tank 6. The drying gas is supplied through a circumferential channel 7 which extends around the periphery of the tank 6 and communicates through openings in the tank shell 6 with air radial channels 18. The dried material is discharged through the first tube 8 (FIG. 1). Saturated drying gas passes through both the first tube 8 and the second tube 13. (FIG. 1) From a working point of view, the drying apparatus is divided into four zones, namely the material feed zone, the main drying zone, the drying zone and the zone. separating the dried material from the drying gas.

In the illustrated apparatus, there is a feed tube in the feed zone of the dried material

17 which feeds the liquid or sludge to be dried into a dish-shaped liquid collector 19 provided with downwardly directed discharge tubes at its edge and arranged around the shaft of the screw conveyor 16. The discharge tubes terminate just above the dampening vessel 20, which is mounted outside a worm conveyor housing 16. The worm conveyor housing 16 is rotatably arranged about the worm conveyor 16 by a sprocket 22, a chain 23, and a fourth motor 24 (FIG. 3). The rotation is controlled in such a way that when the screw conveyor 16 is rotated in one direction, the sleeve 21 will rotate in the opposite direction. Rotational speeds are not critical, but can be varied as desired. In addition to the liquid collector discharge tubes 19, a pair of spiral arms 25, connected to the screw conveyor shaft 16, extend into the humidification vessel 20. The liquid collector and the spiral arms 25 serve to guide the liquid from the inlet tube 17 to the humidification vessel 20 without coming into contact with side of the spiral arms 25 on which a thick layer of dried liquid would otherwise settle. In the moistening vessel 20, the liquid comes into contact with the contact bodies 14, which have been brought into it by the screw conveyor 16. By the action of the spiral arms 25, the contact bodies 14 are inverted so that perfect contact occurs and a uniform layer of liquid is formed on the surface. these contact bodies 14 are then guided towards and beyond the edge of the moistening vessel 20 where the scattering arms 26 are disposed. The scattering arms 26 extend from the inner wall of the tank 6 to the outer edge of the moistening vessel and are attached to the moistening vessel 20 together with it rotated. The dispersion arms 26 serve to disperse the contact bodies 14 in a uniform layer on the bed 27 without forming a repose angle.

The second zone, which is the main drying zone, begins at the base bed 27 of the wrapped contact bodies 14 and includes the top of the base bed 27. In the main drying zone, the contact bodies 14 moving downward meet the flow of drying gas controlled in the direction away from the air radial ducts

18. This countercurrent transport of contact bodies 14 and the drying gas provides maximum ^Prior: NEK drying zone in the main drying. Downstream of the main drying zone and at the bottom of the bed 27, or below the point of introduction of gas from the air radial ducts 18, a drying zone begins, in which, as its name implies, the material bound to the contact bodies 14 is dried. In the drying zone, the gas in the after-drying zone is guided in parallel with the contact bodies 14, thereby allowing the last drying stage to proceed as lightly as possible.

This is particularly important when it is desirable to avoid overheating of sensitive materials, such as foodstuffs, etc. Finally, the contact bodies 14 arrive in the fourth and last zones, i.e. the zone of separation of the dried material that is. located in the lower part of the tank 6 and in which the dried material is separated from the contact bodies 14, which are then returned to the zone. feeding the material by a screw conveyor 16 for the next drying cycle.

As can be seen from Fig. 2, the separation zone of the dried material consists of a plurality of cooperating members, first of which are two feed arms 28, located in the lower part of the bed 27 and directly above. As can be seen from FIG. 3, the feed arms 28 may have a spiral shape with a rake surface as seen from above, which increases from the center of the tank 6. The height of the inlet opening of the feed arms 28 is substantially constant, as shown in Fig. 2, and corresponds to two to five times, preferably three times the total diameter of the contact bodies 14. This dimension has been shown to be advantageous because this prevents spherical contact bodies 14 with the feed channel channels 28. Said constriction together with the separator rotor 29, located centrally in the lower part of the tank 6, forms a relatively narrow circular slot to which they are. In order to completely separate the dried material from the surface of the contact bodies 14, the separator rotor 29 is provided in the gap with rotor plates 30 which fit into said gap and are made of stainless steel or other durable material, and in addition to in this case, the gap narrowing is shaped as a separating stator 31, which, like the separating rotor 29, is provided with stator plates 32 which fit into said gap. The separator rotor · 29 is connected to the worm shaft. The tests have shown that the effective radial distance of the gap axis from the center of the dryer is in the range of 0.5. up to 1 meter, because larger. the distance would result in unacceptably high peripheral speeds of the rotor plates 30 and the separator rotor 29. It should be remembered that this relates to a rotational speed of about 10 to 40 rpm of the screw conveyor 16 and that other speeds weigh other values. A perforated separating bottom 33 is provided below said gap, which is shaped to allow the dried material to pass through and to retain the contact bodies 14 released from the dried material. The clean contact bodies 14 are then transported up into the feed line. material by a screw conveyor 16 which reaches down to the perforated separation bottom 33.

Separation. the equipment works on the basis of the following principle. At the bottom of the bed, the contact bodies 14 with the layered material pass substantially already in dry condition, co-current with the drying gas, to the feeding arms 28. The contact bodies 14 are trapped by the feeding arms 28 and moved towards the center of the tank 6 towards the annular separation gap. Once they have passed through said gap, the contact bodies 14 are brought into perfect mutual friction both on themselves and on the rotor and stator plates 30 and 32, which fit into the gap and rotate with respect to one another, thereby completely and quickly removing dried material from the contact bodies. 14. This removal is further facilitated by a strong gas stream which reduces the space in the gap and entrains any released flakes of dried material and ensures movement of said material within. in a predetermined direction by a perforated separating bottom 33 k. The first tube 8 for transport to the separating cyclone 9 shown in FIG. 1. By suitable control of the suction blower 12 and the discharge blower 2. the gas flow and hence the temperature in the tank 6 and in the separation gap can be adjusted to a desired value.

The dryer shown in FIG. 2 has an additional channel 34 which is arranged around the lower cylindrical portion of the tank 6 and connected to said annular separation gap. An additional channel 34, without which most can. In the case of bypasses, they serve to supply cooling air for exclusion. any. the tendency to stick to materials exhibiting said heating tendency and to facilitate separation of the final dried material.

Giant. 4 shows another arrangement of feeders which is particularly intended for feeding semi-solid or dough material. To establish sufficient contact between the feed material and the contact bodies 14 and to provide a layer of material on the surface. the contact bodies 14 is. arrangement such. This means that the feed material is brought into contact with the contact bodies 14 already at a distance from the screw conveyor. 16. For this reason, the shaft of the worm conveyor 16 in its upper part 35 is hollow and internally. This hollow shaft part 35 is an auxiliary worm conveyor 36 driven by a fifth motor 37. In the illustrated device, the hollow shaft of the worm conveyor 16 is shaped at its upper end as a receiving hopper 38 for. material designated. for drying and drying. at its lower end, the shaft has a manifold tube 39 through which the material is discharged into the space between the screw conveyor 16 and its housing 21. As shown in FIG. 4, the auxiliary screw conveyor 36 ends at the screw conveyor. of the conveyor 16 just in the area of the distribution pipes 39. Above the distribution pipes 39 is a mixing zone 40 with first and second mixing arms

41, 42, which are attached to the worm conveyor shaft 16 and to the inner wall of its housing 21, each separately. These first and second mixing arms 41, 42 contribute to bringing the dried material into contact with the contact bodies 14. Like the dryer of FIG. 2, the dryer shown in FIG. 4 is also provided with a moistening vessel 20 at the upper end of the worm conveyor housing. which is arranged around said housing 21 and a pair of rotating spiral arms 25 which extend into the wetting vessel 2D. The spiral arms 25 of FIG. 4 are connected, as in the embodiment of FIG. 2, to the shaft of the screw conveyor 16 and are adjusted in rotation to move the contact bodies 14 towards the edge of the dampening vessel.

20. In order to efficiently disperse the coated contact bodies 14 on the lower bed 27, the dryer of FIG. 4 is provided with distribution pipes 43 which are attached to the edge of the moistening vessel 20. The distribution pipes 43 extend shortly downwards from the edge of the moistening vessel 20. In addition, the manifold tubes 43, as seen from above, may exhibit a slight curvature rearward in the direction of rotation. In order to achieve a positive supply of the coated contact bodies 14 through the distribution pipes 43, the wetting vessel 20 is provided with a lid 44 which can be removed for inspection and repair purposes.

Giant. 5, 6 and 7 show another example of arrangement of feeders intended especially for feeding and distributing a solid material, for example grass. As in FIG. 2, here too, the dryer is equipped with a screw conveyor 16, its housing 21, and a dampening vessel 20 which is arranged around said housing.

21 and one or more diffuser arms 26 attached to the moistening vessel 20. However, when the material to be dried is rigid, the contact bodies 14 do not come into contact with the feed material already in the moistening vessel 20, as in the apparatus of FIG. 2. Instead, contact is only achieved during the dispersion of the contact bodies 14 above the base bed 27. For this reason, the inlet tube 17 and the liquid collector 10 in Figure 5 have been replaced by a spreading carriage 45 located above the base bed 27 and constructed to be a solid dried material, such as grass, is distributed uniformly over the bed 27 by means of a conical spreading roller 46, which is mounted on the bottom of the spreading carriage 45. This spreading carriage 45 is secured to the moistening vessel 20 so as to rotate around the center of the tank 6. For rotation, the conical spreading roller 46 is opa at its end, facing the wall of the tank 6 by a toothed wheel which engages the respective teeth disposed around the periphery of the tank 6, and with its other end mounted to the moistening vessel 20. In order to ensure uniform distribution of material over the bed 27 The carriage 45 and the spreading roller 46 corresponding to said opening are conically tapered towards the center of the tank 6. The spreading roller 46 shown in the drawings has nails, but of course other types of rollers suitable for distributing rigid or piece material. In addition, it is also understood that the spreading carriage 45 may have two or a few of the spreaders mentioned above, instead of a single spreading roller 46, which travels along the indicated path along the bed 27 in order to achieve the desired layer structure at the bottom layer. shown in FIG. 6, the diffuser arm 26 should rotate rather immediately behind the spreading carriage 45 to prevent distributed light material, such as grass, from being lifted and carried up by the flowing gas passing through the bed 27.

The dryer shown in Fig. 8 is designed for viscous materials and essentially corresponds to the dryer shown in Fig. 4. However, the feeders for the feed of the dried material are somewhat simplified compared to the arrangement of Fig. 4 and lack, inter alia, an auxiliary screw conveyor 36 and a collecting conveyor. hopper 38 shown in FIG. 4. Instead, the material is fed directly through a third tube 47, which is connected to the hollow portion of the screw conveyor shaft 16. The material is fed through the third tube 47 to the hollow upper portion 35 of the screw conveyor shaft 16 and into the manifolds. of tubes 30 by means of a screw feeder.

Giant. 0 shows the feed material feeder arrangement particularly useful for feeding to pieces of chopped products and the like as in the dryers shown in FIGS. 2 and 4, here too, the screw conveyor 16 is provided in its upper part with spiral arms 25 which discharge a mixture of contact bodies 14 and into pieces of chopped material by distribution pipes 43 connected to the rotary sleeve 21 of the screw conveyor 16 which is arranged around said screw conveyor 16. Above the discharge spiral arms 25 and the distribution pipes 43 is provided a lid 44 which extends upwardly in the form of a cylindrical and closes the space into which the chopped material is fed to the pieces by an insert member 48, for example a screw feeder.

Claims (9)

OBJECT OF THE INVENTION Apparatus for contacting a dried substance with a desiccant, for example a liquid, semi-solid or solid gas material, the apparatus having a base bed tank of a plurality of spherical contact bodies which are guided by the tank in circulation over a path it has in said container. a discharge region in which the substance to be dried is carried onto the contact bodies, a main drying region lying at the top of the bed, a peripherally arranged drying agent supply point, a drying area laid at the bottom of the bed, and a separating zone provided below the bed for separating the finished material from the contact bodies, the separating zone having a perforated bottom which permits the finished product to be retained, but retains the contact bodies for their return to the material discharge area by means of a centrally located screw conveyor which surrounds the housing extending downwardly against the perforated bottom, characterized in that the housing (21) surrounding the screw conveyor (16) is rotatably arranged relative to the screw conveyor (16), that the material discharge area has a discharge members that are rotatably disposed at the upper end of the worm conveyor (16) and for circulation with the rotary housing (21) of the worm conveyor (16) have dispersion arms (26) mounted therein, and the worm conveyor (16) has separation members at its lower end; consists of pivotable feed arms (28) mounted on a rotary bushing (21) of the worm conveyor (16) for circulating and passing the contact bodies (14) together from the bottom of the bed (27) to the gap inside and below the feed arms (28) ), wherein the gap is formed from an internal separating rotor (29), which is connected to a shaft of a screw conveyor (16) for common circulation and from an external stationary separator stator (31), which is located below the gap with the inner separator rotor (29). Apparatus according to claim 1, characterized in that the separating rotor (29) has rotor plates (30) and the separating stator (31) has stator plates (32) projecting into the gap. Device according to claim 1 or 2, characterized in that the gap is provided with an additional gas supply channel (34) around its upper periphery. Apparatus according to one of Claims 1 to 3, characterized in that the discharge members consist of a dampening container (20) arranged on and arranged around the rotatable housing (21) and a rotatable liquid collector (19) connected to a screw conveyor shaft (16), said liquid collector (19) extending down into a dampening vessel (20) for introducing the substance to be dried from the rotary spiral arms (25) connected to the screw conveyor shaft (16), for circulating and moving the contact bodies (14) against the outer edge of the humidifying vessel (20) and the rotatable dispersion arms (26) connected to the outer periphery of the humidifying vessel (20) extending to the outer wall of the tank (20) 6), for dispersing the contact bodies (14) coming from the moistening vessel (20) through the bed (27) in the tank (6). Apparatus according to Claim 4, characterized in that the liquid collector (19) consists of a collecting vessel arranged around the shaft of the worm conveyor (16); • outlet pipes extending downward from the collecting vessel. Apparatus according to one of Claims 1 to 3, characterized in that the substance discharge members consist of feeders for the material to be dried to be inserted through the upper hollow part (35) of the screw conveyor shaft (16) to the manifolds. (39) provided on the lower part of the upper hollow part (35) of the first and second mixing arms (41, 42) provided on the upper part of the screw conveyor (16) for mixing the first substance discharged from the distribution pipes (39) with contact bodies (14), a dampening container (20) disposed around the rotatable housing (21) and spiral arms. (25), connected to the screw conveyor shaft (16) and extending into the dampening vessel (20), from the manifolds (43) connected to the dampening vessel (20), and from the circular lid (44) closing the dampening vessel (20) extending from the shaft of the screw conveyor (16) to the distribution pipes (43). Apparatus according to claim 6, characterized in that the feeders consist of an auxiliary screw conveyor (36) which is located in the upper hollow part (35) of the screw shaft. and that the first and second arms (41, 42) are located on the top of the shaft of the worm conveyor (16) or sleeve. Apparatus according to one of Claims 1 to 3, characterized in that the substance dispensing members consist of a dampening container (20) disposed around and extending around the rotatable housing (21), of rotatable dispersion arms (26) connected having an outer perimeter of the dampening vessel (20) and extending to the outer wall of the tank (6) for distributing the contact bodies (14) coming from the dampening vessel (20) through the bed (27) in the tank (6, from the spreading cart) For the substance to be dried, laid between the outer edge of the moistening vessel (20) and the wall of the tank (6), and above the bed (27), the spreading cart (45) having an opening in the bottom and arranged therein a rotatable conical spreading roller (46) to rotate about the center of the tank (6) along a path above the bed (27), preferably before spreading202027 by the flanging arm (26) as viewed in the rotational direction measurement. Apparatus according to one of Claims 1 to 3, characterized in that the substance discharge members consist of distribution pipes (43) located on the upper part of the screw conveyor (16) on the rotating sleeve (21) and of the discharge spiral arms (43). 25), located on the upper part of the screw conveyor shaft (16) to carry the substance to be dried and from the contact bodies (14) through the distribution pipes (43), from the cylindrical around the highest part of the screw conveyor shaft (16) (44), located above the distribution pipes (43) and the discharge spiral arms (25) having an insertion arm for the substance to be dried, and of insertion members (48) for inserting the substance to be dried into the insertion space, surrounded by a lid (44).