JPH0434067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a double cylindrical dryer that performs low-temperature drying of viscous materials to be dried (raw materials).

(Prior art) For example, animal organs, enzymes, etc. as raw materials for pharmaceuticals, meat, eggs, fruits, miso, etc. as raw materials for processed foods, and household wastes and industrial wastes as waste materials are in the form of liquids, slurries, and pastes. It is dried in a viscous state such as syrup. However,
When drying such materials, if the heating temperature is too high (approximately 80℃ or higher), the components (proteins, etc.) will be denatured by the heat, resulting in a decrease in nutritional components and enzymatic power. Sufficient care must be taken when setting conditions.

However, in order to dry the above-mentioned viscous material to be dried, conventional methods include hot air shelf dryers that dry the product by coating it on a glass plate, spray dryers that dry the product by spraying it into a high-temperature air stream, and dryers that dry the viscous material on the surface of a rotating drum. Apply in film form,
Various drying methods have been used, such as a drum dryer that heats the drum from the inside with steam to dry it, and a freeze dryer that freezes and dries it in a vacuum, but each has its advantages and disadvantages, and no dryer is still satisfactory. The current situation is that this has not been obtained.

Among them, drum dryers are widely used as they have moderate productivity and manufacturing costs, but by blowing steam into the drum,
The drum temperature tends to be high (80°C or higher), and there is a risk of causing denaturation of the ingredients, especially in the case of drying materials that require the above-mentioned low-temperature processing, and the drum itself is designated as a class 2 pressure vessel. At the same time, there were strict regulations on distortion of the drum surface due to steam pressure, temperature, etc., and there were inherent manufacturing difficulties in terms of strength and precision.

(Object of the Invention) In view of the above-mentioned problems of the prior art, the present invention provides a drum dryer that has a simple structure, does not have any manufacturing difficulties, and can dry viscous materials in a granular form or in a short time at low temperatures. The purpose is to obtain a double cylindrical dryer capable of drying into flakes.

(Structure of the Invention) In order to achieve the above object, the present invention provides at least one pair that are arranged in parallel with a slight gap and shifted in height in the vertical direction, and that rotate in opposite directions at different circumferential speeds. a cylindrical drum; a housing that surrounds the drum and has a bottom surface that slopes along a diameter extension line passing through the axes of the pair of drums; and a product holder provided at the lowest part of the sloped bottom surface of the housing; A hot air supply means connected to the housing along the diameter extension line and an opening for blowing hot air from above the pair of drums, and means for supplying the material to be dried onto the drums. It is characterized by:

Due to this cylindrical shape, the material to be dried is spread and spread in the axial direction of the drum, and since hot air is blown from the circumferential direction of the drum, there is no unevenness in the spreading in the axial direction, and the drying state is maintained at the axis. uniform in direction. In addition, a thin layer of the spread material to be dried overlaps in the gap between the pair of drums, and due to the difference in peripheral speed of the drums, frictional force is generated in the circumferential direction, forming this thin layer into a layer with a richly undulating surface. In addition, when hot air comes into contact with the uneven layer, moisture can be evaporated and transported by heating. In addition, after drying the material to be dried, the peeled and crushed material scatters and falls into the air, is carried downward by warm air, slides on the bottom surface, and is collected in the product receiver provided at the lowest part of the bottom surface. .

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows the structure of a double cylindrical dryer according to the present invention. In the figure, reference numeral 1 denotes a housing, which consists of a pair of inclined main bodies 2a and 2b arranged on the left and right, the lower parts of the main bodies 2a and 2b are joined, and a product receiver 3 is provided at that point.
The product receiver 3 is placed and fixed together with a drive motor on a base 5 built on the ground 4, with the product receiver 3 looking above the ground 4. A pair of cylindrical drums 6a, 6b and 7a, 7b are disposed inside the main bodies 2a, 2b of the housing 1, with a slight gap (described later), and are vertically shifted in height. These are rotated in opposite directions and at different rotational speeds (in the figure, R ₁ ,
(denoted by R ₂ ).

On the other hand, above the housing 1 and on the pedestal 8, there are 2
The body parts 9a, 9b are provided with two body parts 9a, 9b.
Heaters 10a, 10b and air filter 11 are installed inside.
A and 11b are arranged inside the duct 12, and the duct 12 and the housing 1 are connected to each other by connecting pipes 13a and 13b.
It is opened facing the circumferential surfaces of the drums 6a and 7a from the upper side on the diameter extension line x passing through the axes of the drums 6a and 7b. Further, a blower 14 is fixedly mounted on the pedestal 8, and the blower 14 communicates with the duct 12 and also communicates with the bottom side of the housing 1 via a back filter 15. That is, the duct 12, the blower 14, and the bag filter 15
and communicate with each other to form a means for supplying hot air into the housing 1.

Reference numeral 16 denotes a raw material tank for storing a viscous material to be dried. Pipes 17a and 17b extend from the raw material tank 16 into the main bodies 2a and 2b of the housing 1, and a pair of metering pumps 18 interposed between the raw material tank 16 and the main bodies 2a and 2b of the housing 1 A certain amount of material to be dried is fed onto the drums 6a, 6b and 7a, 7b.

With this configuration, when the blower 14 is driven and the heaters 10a and 10b are turned on,
As shown by arrows in the figure, the air fed into the duct 12 from the blower 14 branches within the duct 12 and reaches the body parts 9a, 9b, where the heater 10
a, 10b. The heated air enters the housing 1 from the connecting pipes 13a, 13b as hot air, moves along the circumferential surfaces of the rotating drums 6a, 6b and 7a, 7b, and then reaches the bottom of the housing 1. , returns to the blower 14 through the baggage filter 15, and returns to the duct 12.
Thereafter, the circulation is repeated along the above-mentioned route. During this time, the air is purified by the air filters 11a, 11b and the bag filter 15, and clean hot air is constantly fed into the housing 1. In addition, fresh air is taken in from the blower 14 as needed, and the exhaust port 19 is taken in from the duct 12.
The humid warm air used for drying is exhausted through the

On the other hand, by operating the metering pump 18, a fixed amount of material to be dried is fed from the raw material tank 16 onto the pair of drums 6a, 6b and 7a, 7b via pipes 17a, 17b.

As schematically shown in FIG. 2, the drums 6a and 7a and the drums 6b and 7b have a slight gap t between them, and _R1 and _R2 rotate at different rotational speeds. Since there is a drum 6a,
The material to be dried A retained on the drum 6b is transferred to the drums 6a and 6.
When passing through the gap b, it is spread in a thin layer on both the drums 6a and 6b, and the surface is rich in undulations due to the frictional force in the circumferential direction caused by the adhesiveness of the material to be dried A and the difference in peripheral speed between the drums 6a and 6b. A thin layer B of the material to be dried is formed on the surface of the drums 6a, 6b.

The surface area of such a thin layer B of the material to be dried is greatly expanded due to its uneven surface condition, and therefore the drying efficiency is extremely high, and it is rapidly dried when exposed to the hot air. When a certain degree of dryness is reached, as shown in FIG. 3, the drums 6a and 6b are automatically peeled off and crushed from the surfaces of the drums 6a and 6b due to mutual frictional force, resulting in granular or flaky particles. Product C is produced, which completes one cycle of drying.

As shown in FIG. 1, the produced product C falls to the bottom of the main bodies 2a, 2b, collects at the bottom of the housing 1 due to its own weight and warm air, and is automatically stored in the product receiver 3.

In this way, this double cylindrical dryer automatically increases drying efficiency by taking advantage of the adhesion and frictional force between the objects to be dried, and the objects to be dried can be automatically peeled off from the drum and turned into products. I did it like this,
Their productivity is extremely high. If the temperature of the hot air is set to a low temperature (approximately 80°C or less), it is possible to dry workpieces that are easily denatured by heat, such as pharmaceutical raw materials such as animal organs, and processed food raw materials such as meat and eggs. It can be used extremely effectively. In addition, materials to be dried that do not particularly require low-temperature processing,
For example, it can be used to dry industrial waste.

Incidentally, the double cylindrical dryer of this example has a drum diameter of 30 to 60 cm and a drum width of 100 cm.
~150cm, drum rotation speed ratio: 1:2, drum gap t: 0.1~0.5mm, hot air temperature: 30~80℃, and is usually used for drying the viscous material to be dried. takes 2 to 10 minutes per cycle. However, this specification is not limited to the above setting range, and the value is appropriately selected depending on the properties of the material to be dried.

Note that in the above embodiment, the pair of drums 6
Although a, 6b and 7a, 7b are made to have the same diameter and the rotational speed is changed, instead of this, the size of the diameter may be changed to change the circumferential speed at the same rotational speed. Also, a pair of drums 6a, 6b and 7a, 7
b is not limited to installing two lines, but may be reduced to one line or expanded to a larger number of lines. Further, the drum material is usually stainless steel, but instead of this, reinforced plastic, ceramic, hard chrome-plated ordinary steel, etc. may be used.

(Effects of the Invention) As described above in detail, the double cylindrical dryer according to the present invention is provided with a pair of rollers that rotate at different circumferential speeds in the housing, and also includes a hot air supply means and a heated air dryer. Since it is equipped with a dry matter supply means and does not use steam as in conventional systems, its structure is simplified and equipment costs and operating costs are greatly reduced. In addition, due to the cylindrical drum rotating at different circumferential speeds, various adhesive forces and circumferential frictional forces act between the objects to be dried, making the surface of the objects to be dried uneven and increasing their surface area. Since hot air is applied in this state, the material to be dried can be quickly dried.Also, since the hot air flows from the circumferential direction along the diameter extension line passing through the axes of the pair of drums, the material to be dried can be dried quickly. The area of contact with the object is increased, the drying process is uniform in the axial direction, and evaporated water is transported through the undulating surface, increasing drying efficiency and making it easier to peel and crush the dried object. , it has the effect of simplifying the collection of cargo, and since the pair of drums are shifted in the vertical direction, the casing can be easily installed at an angle, making it easier to collect the fallen materials to be dried. The productivity of the dryer has been significantly increased. Moreover, the above-mentioned high drying efficiency is particularly effective in low-temperature processing, and can be said to be optimal for drying viscous materials to be dried that are easily denatured by heat.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the structure of the double inner cylinder dryer according to the present invention, Fig. 2 is a schematic diagram showing the initial flow state of the material to be dried between the drums, and Fig. 3 is a schematic diagram showing the same final stage. It is a schematic diagram showing a fluid state. 1...Housing, 3...Product receiver, 6a, 6
b, 7a, 7b...drum, 10a, 10b...
Heater, 11a, 11b... Air cleaner, 12
...Duct, 14...Blower, 15...Block filter, 16...Raw material tank, 17a, 17b...
...Piping, 18...metering pump.

Claims (1)

[Claims] 1. At least a pair of cylindrical drums that are arranged in parallel with a slight gap and shifted in height in the vertical direction, and that rotate in opposite directions at different circumferential speeds, and a pair of drums surrounding the drum. a housing having a bottom surface inclined along the diameter extension line passing through the axis of the housing; a product receptacle provided at the lowest part of the inclined bottom surface of the housing; 1. A double cylindrical dryer comprising: a warm air supply means connected to an opening for blowing hot air from above; and means for supplying drying material onto the drum.