SU892156A1 - Dryer for loose materials - Google Patents

Description

(54) DRYER FOR BULK MATERIALS

one

The invention relates to equipment for drying bulk materials and can also be used in blending processes.

Dryers for bulk materials are known, comprising a rotating perforated drum with guiding transverse partitions fixed on its inner surface, forming compartments connected by a side surface to a source of heat carrier.

In the known dryers, obtaining a quality product is difficult, since the cells of the dried material are affected by the steady flow of air exiting the holes around the entire perimeter of the dryer.

The residence time of individual particles in the drying zone is different.

Due to the presence of transverse partitions fixed on the inner surface of the perforated drum, the conditions for transporting the material along the axis are difficult.

The purpose of the invention is to intensify heat and mass transfer by providing drying of materials in suspension.

To achieve the goal c. the dryer containing a rotating perforated drum with guiding transverse partitions fixed on its inner surface, forming compartments subclassified with a side surface to the source of heat carrier, the partitions are made

10 in the form of truncated cones, facing smaller bases in the direction of material transfer, and the heat transfer source is connected to the compartments by rectangular ducts.

15

FIG. i shows the design of a dryer used, for example, to dry and mix the two components; in fig. 2 shows section A-A in FIG. one.

Dryer for bulk materials has

20 hoppers 1 with feeders, perforated mixing drum 2 with longitudinal partitions 3. Mixing drum 2 is installed in bearings 4 in a fixed shell 5 and inside it is made transverse partitions 6 in the form of truncated cones, facing smaller bases in the direction of displacement of material 1. To the outer surface of the mixing drum 2, immobile distribution right-and-go boxes 7 are placed, by means of which the coolant is supplied — in the case of using the dryer at the same time for drying and mixing the components, or cold air — in the case of extrusions and as a mixer. . The drum 2 is provided with a rotational drive 8 around a horizontal axis. Nozzles 9 provide gas flow to the B-box 7. A conical surface 10 is counter-mounted to the latter transverse partition 6 along the material. A receiving tray 11 made in the form of an alternating-section chamber is rigidly attached to the fixed shell 5. To the output end of the drum 2 is attached to the wall 12 and the drive shaft 13.

Dryer for bulk materials works as follows.

The extra components to be displaced are fed from the bins 1 to the perforated mixing drum 2, which rotates around its axis from the drive 8. The gas is fed to the fixed distribution boxes 7, upper and lower, by means of pulleys 9. The gas flow from the lower duct 7 passes through the holes in the drum 2, fluidizes the material and moves it along the annular partitions in the direction of the outlet hole. Thus, the friable material moves forward, moving both steps from one compartment to another, like a series of inclined fluidized beds, placed adjacent to drum 2. Moving bulk material takes place in the area of the lower distribution box 7. When the drum 2 rotates, the longitudinal partitions 3 are carried out from the fluidization zone, pressed by centrifugal forces to the inner surface of the drum 2. Fall further into the zone of action of the gas flow, 216 .4

flowing from the upper distribution box 7, the bulk components are dropped from the wall, passing into suspension, and deposited in the lower part of the drum - 2. At the exit from the last compartment, the material falls on a conical surface 10 and, rolling down it, passes through the cavities in the wall 12 to the receiving tray 11. In this case, the centrifugal forces exceed the forces

fg t tinsel.

If, on the other hand, the centrifugal forces of the rotational motion are small, then the crossing occurs as the partitions lift the material as a result of the force of gravity. The size

The holes in the drum 2 are chosen smaller than the particle sizes of the materials being processed.

The dryer provides an intensive process of drying and mixing during pulsed processing of the material while maintaining high productivity. The mechanical effect on the particles is eliminated, the implementation of a soft drying regime and the refining of materials prone to adhesion with the internal surface of the bartban are possible. The mixing and drying processes are carried out in a suspended state. Installation of truncated cones easily solves the problem of transporting materials from the inlet section of the drum to the point of discharge.

Claims (1)

Invention Formula Drying materials for dry materials containing perforated rotating drum with guiding transverse partitions fixed on its inner surface, forming compartments connected by a lateral surface to the source of heat carrier, characterized in that in order to intensify the heat and mass transfer by ensuring the drying of materials in a suspended state, the partitions are made in the form of truncated cones that face less movement towards material, and the heat source is connected to the compartments with rectangular ducts.   wh / G. street 4U-rn / /: / / / / s X / / X U | 1. four