RU2367866C1 - Tumble drier - Google Patents

Abstract

FIELD: heating; drying.

SUBSTANCE: device is intended for drying of materials. Case features rotating elevation vane attachment mounted inside, insulated boxes mounted discretely and equipped with air inlet and air discharge pipes. Elevation vane attachment is mounted discretely between insulated boxes, and vanes of elevation vane attachment are mounted at an angle less than external friction angle of material.

EFFECT: improved performance and material drying quality.

4 dwg

Description

The invention relates to techniques for drying bulk materials in a rotating drum and can find application in various industries.

A drum dryer is known, comprising a rotatable housing with a motionless blade nozzle, the cantilever part of which is enclosed in a stationary casing made in the upper part with double walls forming a collector (A.S. No. 1339372, class F26B 11/04). The disadvantages of this dryer is its low productivity.

The closest in its technical essence is a drum dryer containing a housing with an inside mounted lifting-blade nozzle, made with the possibility of rotation, a stationary casing, a collector. Moreover, a number of discretely installed insulated ducts with air inlet and air outlet pipes are attached to the lower part of the case (Pat. 2314470 Russian Federation, IPK7 F26В 11/14).

The disadvantages of this dryer is the low productivity caused by a small removal of moisture in one pass of the material through the dryer.

The problem solved by the present invention is to increase the productivity and quality of drying of the dried material.

The present problem is solved in that in a drum dryer containing a housing with a lifting-blade nozzle installed inside, made to rotate, discrete installed insulated ducts with air supply and air outlet nozzles, the lifting-blade nozzle is mounted discretely between the insulated boxes, and the lifting-blade blades nozzles are installed at an angle smaller than the angle of external friction of the material.

Figure 1 is a diagram of the proposed dryer.

Figure 2 is a section aa.

Figure 3 is a section bB.

Figure 4 - section bb.

The dryer consists of an inclined housing 1 (Fig. 1) with a fixed casing 2 in the upper part, inside of which a lifting-blade nozzle 3 is mounted, made for rotation. In the upper half of the housing there is a pipe 4 for supplying hot air. A collector 5 is installed under the nozzle 4, and a material loading nozzle 6 is installed at the ends of the housing 1, a discharge chamber 7 with a nozzle for exhausting hot air 8 and the outlet of the material 9. A number of discrete installed insulated ducts 10 with air supply 11 and air outlet are attached to the lower part of the housing 1 nozzles 12. The lifting-blade nozzle 3 has a drive (not shown in FIGS. 1, 2, 3 and 4) and is mounted discretely inside the stationary casing 2 between the insulated boxes 10 (FIG. 4). In the loading zone (Fig. 2, section A-A), between the boxes 10 and in the unloading zone, there is a lifting-blade nozzle, and in the zone of boxes 10 (Fig. 3, section B-B) there is no lifting-blade nozzle. The blades of the lifting-blade nozzle 3 are installed at an angle less than the angle of external friction of the material.

A drum dryer operates as follows. The initial wet material through the pipe 6 enters the stationary casing 2. In the loading zone I (Fig. 4), by means of the blades of the lifting-blade nozzle 3, the material is captured and rises up. Due to the fact that the blades are installed at a certain angle (less than the angle of external friction of the material), the material is poured gradually from the blade (it begins to pour from the left side of the blade, and ends to pour from the right side of the blade). As soon as the pouring of material from one blade ends, the material begins to pour from the subsequent blade (provided by the optimal distance between the blades). The above allows you to more uniformly distribute the dried material along the height and width of the casing 2. Falling jets of material penetrate the heat flux passing through the pipe 4 for supplying hot air and the collector 5. Then the material moves along the casing 2 and the housing 1 due to the inclination of the drum and the thermal speed flow. When material enters the zone II of fastening of the duct 10, through which cold air is supplied, there is no effect of the blades of the lifting-blade nozzle 3 on the material. Cold air supplied through the inlet pipe 11 (Fig. 3, section B-B) locally cools part of the housing 1 and is discharged through the pipes 12.

Due to the absence of blades in zone II, more efficient cooling of the material surface occurs (due to longer contact of the material with the cooled surface). In contact with the cooled part of the box, the surface of the material is cooled, while the middle of it remains heated. Moisture in the material will tend from the center to the periphery of its surface. The advancement of the material along the duct 10 (Fig. 4) will be provided due to the inclination of the housing 1 and the back pressure of the incoming material. Then the material enters zone III, where the coolants are dried (see above for zone I). In zone IV, the process is similar to the description above for zone II.

The drying and cooling process is repeated several times (depending on the presence of the number of boxes 10).

In zone V, the final drying of the material takes place, which enters the discharge chamber 7, where it is separated from the coolant and removed from the drum dryer.

Claims (1)

A drum dryer comprising a housing with an inside mounted lifting paddle nozzle configured to rotate discretely mounted insulated ducts with air inlet and exhaust ducts, characterized in that the lifting paddle nozzle is mounted discretely between the insulated ducts, and the blades of the lifting paddle nozzle are mounted under angle - less than the angle of external friction of the material.

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