SU735882A1 - Drying cylinder - Google Patents

Description

(54) DRYING CYLINDER

The invention relates to a drying technique and can be used in contact drying systems for tape, fiber and pasty materials.

Devices for drying bulk materials are known, which contain a PS drum mounted in a x-axial heat pipe with an intermixing device in the form of tubes installed at an angle to the axis of the barkan and connected to the heat pipe by radial nozzles forming a heat pipe l with the tubes. LL condenser return to the evaporation zone in the pipe walls are made of slides in which the wicks are placed.

The return of condensate along the wick from the condensation zone to the evaporation zone has the disadvantages that with a large diameter and a drum length this is difficult to do in technical terms, and at low drum speeds, heat can be supplied only to the lower vaporizer f;:.

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area, as its upper parts may be overheated when the liquid is evaporated from the wicks.

Also known are drying cylinders with evaporative, transport and condensation zones, the first of which contains a coaxial insert, which forms an annular cavity with the cylinder, filled with heat-transfer agents 2. In their technical nature such cylinders & 10 are the closest technical solution to the invention. Heat from the injection or radiation heater is transferred to the evaporation zone of the liquid, from where the steam is transferred to the condensation zone. The return of condensate from the condensation zone to the evaporation zone occurs either through centrifugal forces, which ensure an even distribution of the liquid over the entire inner surface of the heat pipe, or through a system of capillaries made on the inner surface of the pipe. Iopos: The first variant is that the conflict and its uniform distribution on the inner surface is possible only at a thermal rotation frequency at which the centrifugal forces exceed the throats of the fluid. At a low frequency of rotation, condensate will accumulate from the bottom of the pipe and heat will only need to be supplied to the lower generator of the evaporator in order to avoid overheating of its upper parts. In the second embodiment, capillary structures allow the entire surface of the evaporation zone to work efficiently at any frequencies in the heat pipe. However, the creation of capillaries with a large diameter and pipe length is difficult technically. In addition, the working capacity of the 7-fold capillary is limited, therefore, with an intense heat supply, cylinder overheating is possible. The purpose of the invention is to increase the efficiency with the use of foam heat transfer fluid. This is achieved by the fact that in the transport zone a transverse partition is installed with the possibility of rotation on autonomous supports, with a center of gravity lying below the axis of rotation, made with openings on the periphery located on the same diameter, and radial stakes are attached to the inner pierce of the case. forming a labyrinth seal with a partition. FIG. 1 shows schematically a proposed drying cylinder for foam materials: FIG. 2 is a section A-A in FIG. 1 in FIG. 3 - section bb in fig. 1 in fig. 4 - section bb of fig. 1 in FIG. 5 is a drying cylinder used for pasty materials. The drying cylinder is made in the form of a heat pipe 1 with an evaporative 2, a transport 3 and a condensation 4 zones. In zone 3 there is a partition 5 mounted rotatably on autonomous supports (core b and 7) and having two diametrically located openings 8. Center t Tin plate 5 is located below the axis of rotation HQ of one diameter with holes 8, Ker 7 is mounted on a crosspiece O rigidly connected to pipe 1, core 6 is connected to 1 ShlindriGgy BCTG13KO 1 O, attached to the thorny wall of the evaporative pipe 2 pipe 1. Cylinder insert 10 arr zuet pipe 1 with an annular gap, groove kolia LVA 11 and 12 fixedly attached to the inner surface of the pipe 1 at both sides of the partition 5 to form a labyrinth seal with it. Before sealing, the pipe is filled with the necessary amount of working fluid 13c by adding a liquid blowing agent. The evaporation zone 2 is enclosed in a casing 14 to which coolant is supplied, for example flue gases, washing the outer surface of the evaporation zone of the pipe. The connections of the casing 14 to the pipe 1 are sealed. For drying long (paper, cardboard, cloth) and fibrous materials for the entire length of the condensable zone 4 with a gap relative to the pipe, depending on the thickness of the material being spun, there are two ropes 15, which bend around the material being dried (see Fig. 4). . For a day of pasty materials above the condensation zone 4 of the pipe 1, a feed hopper 16 with a distribution roller 17 is installed (see FIG. 5). For removal of dry material, the cylinder is provided with a knife 18 in contact with the outer surface of the condensation zone 4 of the pipe. The pipe is driven through gear 19 from the electric motor 20. The drying cylinder operates as follows. The pipe 1 is rotated from the electric motor 2O through a gear train 19. A long drying material, bending rollers 15, covers the condensation zone 4 of the pipe 1, being in constant contact with it. The rollers 15, pressing the material to the surface of the pipe 1, provides, during its rotation, a continuous feed and removal of the material. Peck: The like material from the hopper 16 is applied to the outer surface of the condensation zone 4 of pipe 1 with a roller 17, which simultaneously provides a uniform thickness of the layer of material. Pasty material sticks to the surface and continues to rotate along with the pipe. The heat carrier is continuously supplied by means of blowing devices (not shown in the drawings) to the casing 14, and the evaporation zone 2 1 flows away, giving up its toppo. In this case, the liquid boils .13, which has all-round foaming, due to the addition of a liquid foaming agent. The cylindrical insert 10, by reducing the volume of the evaporation zone 2, contributes to a better filling of the annular space between the insert 10 and the pipe 1 with foam. This ensures reliable wetting of heat pipes (of the surface and complete heat removal from it. Part of the foam together q formed by the vapor goes through the top hole 8 of the partition 5 into the condensation zone, where the foam disintegrates and the steam condenses on the cold part of the pipe 1, heating it up.The condensate flows into the lower part of the pipe 1 and through the lower opening 8 the partitions 5 return to As a result of the fact that the center of gravity, the partitions 5 are located below the axis of rotation of the pipe 1, the holes in it permanently retain their position. The labyrinth seal formed by the partition 5 and the rings 11 and 12 interferes with the passage of foam, vapor and condensate in other places, holes 8 in the partition 5. Removing the dry pasty material from the pipe surface is done with a knife 18. The use of the proposed 3 cylinder drying simplifies its production, as there is no need for a capillary or silt system and grooves for wicks, as well as increases the reliability in the bot and the efficiency, since the entire internal 3 7 B82 surface of the evaporator heat pipe is constantly detracting with foam at any rotational frequency and thus effectively participates in heat exchange. - Bulk dryers, will find wide application in many industries for contact drying of various materials. Formula of the invention Drying cylinder with evaporative, transport and air-conditioning zones, the first of which contains a coaxial insert, characterized in that, in order to improve efficiency when using foamy coolant, in the transport zone a transverse partition with a center of body is installed with independent support on independent supports lying below the axis of rotation, made with holes along the periphery located on the same diameter, with radial rings attached to the inner surface of the body, forming bulkhead labyrinth seal. Sources of information taken into account during the examination 1. USSR author's certificate b 511497, cl. F 26 В 11/04, 1974. 2.Patent of Great Britain No. 1363361, - “dsi & h SC -VC iriJV - / VJ | Jll I Ctrl l. In 5 In, pub. 1974.

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Claims (1)

Claim The drying cylinder with evaporative, transport and condensation zones, the first of which contains a coaxial insert, characterized in that, with a chain of increased efficiency when using foam heat transfer fluid, in the transport zone, a transverse partition with a center of gravity lying below in the transport zone pivot axes made with peripheral openings located on the same diameter, with radial rings attached to the inner surface of the casing, forming a la irintnoe seal.