JPH03195888A - Method and apparatus for drying particulate material - Google Patents

Abstract

PURPOSE:To stably obtain a non-deteriorated particulate substance by discharging only a substance to be dried reaching set low moisture content during the repeated rising of convective circulation action to the outside from the uppermost part of a drying cylinder. CONSTITUTION:A heater 3 and a blower 2 sending air upwardly are mounted in the vicinity of the bottom part of a drying cylinder 1 formed from a vertical cylindrical body and barrier plates 6 are provided to the inner periphery of the drying cylinder 1 above an introducing hole 4 in two or more stages and a blow-up passage 8 is formed to the central part of the drying cylinder 1. The barrier plates 6 are formed in two or more stages to provide a drying atmosphere range 9 and a spiral guide device 10 is formed to the upper part. A hopper 11 supplying a substance to be dried is provided to the drying cylinder 1 and the leading end of the supply pipe 12 connected to the hopper 11 through a transfer means is connected to the introducing hole 4. A feed-out pipe 13 is connected to a discharge hole 5 to again introduce the substance not reaching set reduced water content into the drying cylinder 1 along with the discharge air from the drying cylinder 1 and connected to the drying cylinder 1 in the vicinity of the bottom part thereof through a return apparatus 15. The particulate material reaching set low water content is discharged to the outside from an outlet 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention particularly relates to a method for drying powder and granular material having a high moisture content and an apparatus therefor.

[Technical background]

The water-containing powder and granules dried by the method and apparatus of the present invention (1) are mainly intended to be used as raw materials for foods after being dried to a predetermined low moisture content. Drying powder and granules with a moisture content at high speed to a low moisture content requires high calories, and the high heat used in the drying process causes changes in quality.The material used in the present invention is Although the substance to be produced using the present invention, which is a raw material for food, has been considered, it has not been possible to produce it using an appropriate method.
There was no first-stage equipment, and if we tried to implement it, the yield would be poor due to deterioration, etc. Also, the use of a large amount of hot soaking made commercialization difficult from a profitability standpoint.There were many problems. Therefore, at present, there is little thought to engage in the production and development of these desired substances.

The highly water-containing raw materials that are used in the method and apparatus of the present invention are residues that are discharged during food manufacturing, and although a small portion is recycled, most of them are currently disposed of. be. However, as mentioned above, this substance has a high water content, so it is treated as industrial waste and considered a polluting substance.

The present invention has developed a method and an apparatus for reusing the above-mentioned materials considered to be industrial waste as raw materials.

[Conventional technology]

In particular, there are many types, forms, and configurations of drying mechanisms that combine a burner device and a blower device as a means for drying a powder or granular material with a high moisture content to a predetermined low moisture content.

[Problem to be solved]

However, methods for drying highly water-containing substances include heat drying, natural drying that has been used since ancient times, and rapid polar cooling methods that are currently available.

There are multiple types of drying methods and drying methods that dry over time, but depending on the type of method and means used for the object to be dried, the desired degree of drying may be achieved over time or over time. It is not uncommon for material changes to occur due to temperatures extremely different from those inherent to the dried material, and although the desired low moisture content may be achieved, the material changes to a different quality.

Therefore, the present invention uses a heating means as a drying means to form an atmosphere in an upward direction, and to apply an upward blowing action to the highly water-containing powder and granules inserted into this atmosphere. Due to the correlation between the wind force and the specific gravity of individual water-containing powder grains, a falling phenomenon occurs in places where the wind pressure is low. The purpose is to form two convective circulation forms.

[Means to solve the problem]

The present invention, as a means to achieve the above-mentioned objects,
A water-containing substance to be dried is inserted from below into a drying cylinder equipped with a heating device and a blower device that generates an upwardly directed wind direction.
While the particles are scattered upward by the blow-up action and dried, a downward convection circulation occurs due to the relationship between the blowing force and the relative specific gravity of the unit particles, and as the degree of drying progresses, the particles decrease in proportion to the specific gravity. The above convective circulation position is successively shifted upward, and while these convective circulation actions are being repeated and ascending? Only the material to be dried that has reached the set low moisture content can be discharged from the top of the drying cylinder to the outside. It is designed to promote forced convection circulation of the material to be dried.

In addition, in history, a drying cylinder is a vertical cylindrical body with an insertion hole for the material to be dried at the bottom and a discharge hole for discharging the dried material to the outside. The apparatus also includes a plurality of baffle plate apparatuses on the inner periphery of the drying tube above the insertion hole so that a blow-up passage can be formed in the center.

Furthermore, the heating device installed inside the drying cylinder is a far-infrared radiator.

Furthermore, each of the plurality of baffle plates installed so as to form a blow-up passage in the center is attached to the inner wall of the drying cylinder with one side thereof obliquely.

[For production]

This invention forms an atmosphere in the lower part of the drying cylinder with a heating means as a drying means, and blows in the -L direction at the same time as drying the highly water-containing powder and granules inserted into this atmosphere. The wind pressure is low due to the correlation phenomenon between the wind force and the specific gravity of the individual water-containing powder grains. At some points, a falling phenomenon occurs, and two convection circulation forms are formed here. Further, in order to promote this convection circulation form, a baffle plate is provided to assist this form. In this way, the drying action progresses even during the convective circulation action in the section formed at a certain height position, and the specific gravity of each middle break is reduced, so that the upper and lower limit positions of the convective circulation gradually shift. The convective circulation position is gradually raised to the first position, and the specific gravity is reduced in proportion to the degree of drying. It was designed so that it could be released to the outside as soon as it reached this point.

) The wind force oriented in one direction is also blown up at the location where the baffle plate is installed, and is guided according to the installation form of the baffle plate to form a spiral shape, and the material to be dried repeatedly comes into contact with the baffle plate and is reflected according to the wind direction. In the drying atmosphere, the moisture content is lowered and the specific gravity itself is also reduced, and the overall position is shifted to the upper position due to the correlation between the blowing wind force and the specific gravity.

If the heating device is a heating element, the range that the blowing air can reach becomes the dry atmosphere zone, and if the heating device is a far-infrared radiator, the dry atmosphere zone becomes the irradiation area, and in this case, the atmosphere in the dry atmosphere zone is high temperature. Only the irradiated object to be dried is converted into natural energy and exhibits a drying effect.

Far-infrared rays are a type of infrared rays, and refer to electromagnetic waves with a wavelength of about 5 microns to 1 micron.The wavelength is close to the unique frequency (wavelength) of polymer compounds, etc., and has weak penetrating power through materials. Well absorbed by substances. In addition, even if it is absorbed by a material, the energy level is not high enough to cause a chemical change, so it will not be converted directly into thermal energy.By using far infrared rays as a heating means of a heating device, drying time can be shortened and the material can be heated. It is an ideal drying method because it does not cause any change and the unit cost of heat energy is low.

〔Example〕

Next, the apparatus for carrying out the present invention will be described with reference to the drawings. It is a vertical cylinder having an insertion hole (4) for the substance to be dried at the bottom and a discharge hole (5) for discharging the dried substance to the outside. The body is a drying cylinder (1), and there is a heating device near the bottom of the drying cylinder (1). !
, (3) and a blower device (2) whose air direction is directed upward, and a plurality of baffle plate (6) devices are arranged in the center on the inner periphery of the drying cylinder (1) above the insertion hole (4). A blow-L passage (8) can be formed in the drying cylinder (1).
The baffle plates (6) have one side connected to the inner wall (1) of the drying cylinder (1) so that each of the baffle plates (6) is obliquely shaped.
7), and is constructed so that the blow-up passage (8) described above is formed inside each of the attached baffle plates (6). In this way, the baffle plate device is formed in multiple stages to provide a dry atmosphere zone (9), and the spiral ring device (1o) is formed in the F direction of the baffle plate device, and the above-mentioned discharge hole is formed near the rlffi between the two ends. The drying cylinder (1) is configured so that (5) is open.

The drying tube (1) is equipped with a hopper (11) for supplying the substance to be dried, and the tip of the supply pipe (12) connected to the hopper (11) via a transfer means is inserted into the insertion hole (4). ), and also dry n(1),
1: Connect the delivery pipe (13) to the discharge hole (5) provided in the section and adjust ff! formed to be inserted into i(+4),
The water that has not reached the reduced edible water rate set here and the air discharged from the drying cylinder (+) are passed through the reducing device (+5), which is inserted into the drying cylinder (1) again, to the vicinity of the bottom of the drying cylinder (1). On the other hand, the powder and granules that have reached the set low moisture content are outputted to the outside from the outlet (16) provided above the adjustment cylinder (14).

In addition, in the figure, the code|symbol (17) shows a motor.

Furthermore, in the above-mentioned system, when drying a substance to be dried, especially a substance with a high moisture content, the drying tube (+)
It is also optional to carry out multiple combinations of the above.Furthermore, the high water content substance explained in the above action is the residue produced in the production process of sigma rot, that is, the one explained for "Okara 1". Most of these disclosures are based on drying methods for reusing materials that have conventionally been disposed of as raw materials for food, feed, or fertilizer.

〔Effect of the invention〕

As described above, the present invention is capable of drying a granular material with a high moisture content to a predetermined low moisture content on a small scale without deteriorating the substance, and with a low median thermal energy cost. It is effective in that it is easy to obtain a stable and unaltered granular material.

[Brief explanation of drawings]

FIG. 1 is an overall vertical sectional view of the present invention, and FIG. 2 is a plan view. (1)... Drying tube, (2)... Air blower, (3)...
... heating device, (4) ... insertion hole, (5) ... discharge hole, (6) ... baffle plate, (7) ... inner wall, (8) ...
・Fukiage passage.

Claims (1)

[Claims] [1] A moisture-containing substance to be dried is inserted from below into a drying cylinder equipped with a heating device and a blowing device that generates an upwardly directed wind direction, and is blown upward by an upward blowing action. While drying, vertical convection circulation is generated due to the relative specific gravity relationship between the blowing wind force and the unit particles, and the convection circulation position is sequentially shifted upward in proportion to the specific gravity that decreases as the degree of drying progresses. The powder and granular material is characterized in that only the material to be dried that reaches a preset low moisture content while increasing these convective circulation effects can be discharged from the top of the drying cylinder to the outside. Drying method. [2] The granular material according to claim 1, characterized in that forced convection circulation of the blown up material to be dried can be promoted by a baffle plate provided on the inner wall of the drying cylinder. drying method. [3] A vertical cylindrical body with an insertion hole for the material to be dried at the bottom and a discharge hole for discharging the dried material to the outside is used as a drying cylinder, and a heating device and an air blower with the wind direction upward are installed near the bottom of the drying cylinder. A drying device for powder and granular materials, further comprising a plurality of baffle plate devices on the inner periphery of the drying tube above the insertion hole so that an upflow passage can be formed in the center. . [4] The apparatus for drying powder or granular material according to claim 3, wherein the heating device installed in the drying cylinder is a far-infrared radiator. [5] Claim 3, wherein each of the plurality of baffle plates installed to form a blow-up passage in the center is attached to the inner wall of the drying cylinder on one side in a diagonal manner. The drying device for powder and granular material described above.