SU406088A1 - DRUM DRYER FOR DRYING HEAT SENSITIVE MATERIALS - Google Patents

Description

Drum dryers for drying thermosensitive materials using a solid heat transfer medium are known, which contain a heat transfer circulation system with separation sections provided with a lifting device in the form of a perforated cochlea. The separation of the particles of the coolant from the dried material occurs by sieving the latter through the lerforator. P. And this coolant rises along a spiral path, moving along the inner surface of the cochlea in the direction of the axis of the drum.

A disadvantage of the known lifting device is the incomplete separation of the material from the heat carrier, which leads to the return of a part of the material to the dryer and the deterioration of its quality.

The purpose of the invention is to improve the separation of material from the coolant.

This is achieved by the fact that the cochlea has transverse projections on its inner surface.

FIG. 1 shows schematically the described dryer, longitudinal section; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one.

The dryer contains a drum 1, mounted on rollers 2, coronal gear 3, pipe 4 for loading material, guide vanes 5, coolant transporting pipe 6 with a spiral insert 7, device 8 for raising the coolant, made in the form of a perforated snail with transverse projections 9 its inner surface, chamber 10 for unloading material and evacuating water vapor, steam pipes //, pipeline 12 for supplying steam and

pipeline / 3 for draining condensate; node 14 for joining stationary steam / 5 and condensate 16 main lines with rotating drum 1.

Solid heat carrier, for example, in the form

The aluminum cylinders are placed in the rotating drum 1. Through the nozzle 4, wet material is also fed there, which is mixed with the coolant by the guide vanes 5. This mixture is moved

between pipes //, simultaneously heating by contact with them, in the direction towards the separation section of the drum 1.

The dried mat; the rial falls through the holes in the separation area and is discharged from the dryer through the chamber 10. The coolant is lifted by the device 8 and fed into the central tube 6. The material is sieved through the perforations of the device 8. The protrusions 9 on the inner surface of the device 8 contribute to better mixing.

heat carrier and cleaning its surface from the poured material.

Next, the coolant through the pipe 6 with a spiral insert 7 is transported to the loading section of the drum 1.

The pipes 11 are supplied with steam through a pipe 12 connected to the steam main 15 via a node 14. The condensate is withdrawn to pipeline 13 to the condensate main 16.

The water vapor formed during the drying process is discharged from the chamber 10 through its upper nozzle.

Subject invention

Drum nouns, for drying thermo-sensing materials, for example, for sulfur antimony, with a solid heat carrier, containing a heat transfer system with a sepa- rative area, equipped with a lifting device in the Look of a perforated street with a sepa- ration section, equipped with a lifting device in the form of a perforated street with a sepa- ration, equipped with a sepa- separation of material from the coolant, the cochlea has transverse protrusions on the inner surface.

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