KR0129801B1 - Method and apparatus for low temperature dry - Google Patents

Abstract

The method is designed to effectively dry a material to be dried, transferred on a conveyer by using the far infrared rays generated from a path heated over and below the conveyer in a pre-drying chamber. In the pre-drying chamber, the material to be dried is carried towards the conveyor and irradiated with the far infrared rays generated from a ceramic layer heated with upper and lower heat sources at 400-500 centigrade degrees. A linear heat shielding air stream is formed over and below the conveyer so that the surrounding of the conveyer is maintained at an ordinary temperature and the material is dried under the ordinary temperature atmosphere through irradiation of the far infrared rays.

Description

Low Temperature Drying Method Using Far Infrared Wavelength and Its Apparatus

1 is a plan view of a low temperature drying apparatus using a far infrared wavelength according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is an enlarged view of portion C of FIG.

* Explanation of symbols for main parts of the drawings

1: Low temperature drying device 1a: Internal partition

10: before drying chamber 11, 21: aspirator

12, 22: exhaust duct 13: intake vent

14: control box 15: air filter

16, 23: irradiation body 16a, 23a: box

17a, 17b: side wall 18: air introduction hole

19: exhaust hole 20: post drying room

30: conveyor 31: motor

40: ceramic layer Ts1, 2, 3: temperature sensor

The present invention relates to a low temperature drying method using a far infrared wavelength and a device therefor, and more particularly, to radiate the far infrared wavelength above and below the conveyor passing through the predrying chamber and to carry the dry matter transported from the inside to the outside effectively. It relates to a novel low temperature drying method and a low temperature drying apparatus suitable for the drying.

Drying is widely used as a means of storage and storage as a preliminary step for the post-processing of food, medicine, textiles, etc. More ideal drying means does not change the original form of the dry matter, that is, intrinsic ingredients or characteristics It is to dry without destroying.

Recently emerged for this ideal drying is a low temperature drying method using a far infrared wavelength.

As known drying techniques using far-infrared wavelengths, Japanese Patent Laid-Open No. 62-117661, Japanese Patent Laid-Open No. 62-164590, and Japanese Patent Application No. 91-4046 are known.

The prior art ① is dried with a far-infrared heater while blowing hot air from a plurality of nozzles installed on the ceiling while moving the sheet coated with an aqueous wax to a belt and drying the stall, and at the same time the porous wall plate installed below the far-infrared heater It is configured to allow air to be sucked through the blower.

The prior art ② is a drying apparatus configured to move a conveyor on which a dry object is placed in a heater box in which an irradiator is installed, and a preheating furnace in which a far infrared irradiator is arranged at the bottom of the conveyor in the heater box, and a far infrared irradiator at the top of the conveyor. The arranged polishing furnaces are provided in succession, and a forced circulation device is provided in the preheating furnace and the polishing furnace.

The present invention is divided into a far-infrared drying chamber and a heating drying chamber equipped with an electric heater, and configured to have a circulation facility for even temperature distribution in the drying chamber.

These prior arts all heat the radiating heat of far-infrared heaters installed on the upper, upper, and lower part of the conveyor in the drying apparatus, usually below 100 ° C, circulating the heat radiating with the far-infrared wavelength, The dried material is to be dried while maintaining at 60-80 ° C.

Therefore, the prior art can be used only as an auxiliary means in the drying process due to the disadvantage that the efficiency is drastically reduced as the far infrared wavelength is emitted at low heat of dissipation (the optimum temperature suitable for the good emission of the far infrared wavelength is 400-500 ° C.). Since the main drying is dependent on heat, the exhaust system is constantly provided to prevent the dryness of the dried material from being excessively dried, pressed or severe due to overheating in the drying chamber.

In addition, the drying method using hot air is a drying method using a far-infrared wavelength, that is, a method of drying by heating from the outside to the inside as opposed to drying the dried object by discharging moisture from the inside to the outside.

By the way, the drying apparatus of the prior art has a weak emission of far-infrared wavelengths, while the temperature in the drying chamber is relatively too high, and the drying yield is lower than that of the drying apparatus using only the far-infrared wavelengths at room temperature. It is pointed out that the problem is that the surface is hardened by drying and cracks hard and has a dark yellow color by drying.

It is an object of the present invention to isolate the internal temperature of the entire drying chamber constituting the first half of the drying chamber by using a far-infrared wavelength at room temperature by isolating the surrounding temperature and the upper and lower temperatures of the conveyor centering on the conveyor carrying the dry matter. To provide a low temperature drying method and apparatus therefor.

It is another object of the present invention to provide a dry product which does not deform the original form at all without completely deforming to the outer surface, and thus there is no fear of deterioration in long-term storage and storage until post-processing.

In order to achieve the above object, the present invention is a low temperature drying apparatus is also divided into a drying chamber before and after drying chamber.

In the pre-drying chamber, an irradiator emitting far-infrared wavelengths is installed, and in the post-drying chamber, an electrothermal heater-type irradiating body is installed.

These irradiated bodies are arranged inside the box in a straight line on the ceiling and the bottom of the front and rear drying chambers respectively, and 400-500 ° C emitted from the irradiating bodies on the inward surface of the pre-drying chamber and toward the conveyor side of the lower box. The ceramic layer which emits far-infrared wavelengths by receiving the high heat of the film is coat | covered, and it installs so that a conveyor may cross in the space formed between the upper and lower boxes.

The present invention is characterized by a device which is specially equipped only in the predrying chamber under this basic composition, that is, to allow drying at far-infrared wavelengths at room temperature.

This device forms a pair of air inlet and exhaust holes of the same size and length facing each other directly above, below the left and right walls of the conveyor in a predrying chamber, and an aspirator is installed on the exhaust side.

When the aspirator operates to draw out a high temperature air stream due to heat emanating from the top and bottom of the predrying chamber, the fresh air is purged from the filter and sucked into the air inlet by the draft pressure.

However, this air is exhausted to the outside immediately above and below the conveyor as soon as it is introduced into the predrying chamber with little time to stay in the predrying chamber.

At this time, the air absorbs most of the heat of divergence from the irradiated material that is concentrated toward the conveyor from above and below, so that it is discharged outside and is also called a thermal barrier.

Under the influence of this thermal barrier, the high heat emitted from above and below is completely blocked and the ambient temperature of the conveyor is maintained at the same temperature as the ambient temperature.

And while the building is passing through the conveyor in the atmosphere of this room temperature, it is effectively dried without the deformation of the original element without destroying its components or inherent characteristics by radiation of far-infrared wavelength, which is not affected by any thermal barrier. The dryness of the outer and inner parts is different, or the outer surface is too dry, so that it does not become dark yellow or hard.

However, the after-drying chamber has a much shorter transfer distance than the pre-drying chamber and does not have such a device.

For example, if the dried material is bread, the skin completely dried in the predrying chamber is passed through the postdrying chamber and subjected to a high heat for a while, so that the outer skin is treated with a characteristic color of a slight tinge.

1 is a plan view of a low-temperature drying apparatus according to the present invention, wherein the drying apparatus 1 is divided into a predrying chamber 10 and a postdrying chamber 20, and the rooftop shows a predrying chamber 10 and a postdrying chamber 20. It is a plurality or single stage aspirator 11 (21) provided on the rooftop of the.

These aspirators 11 and 21 inhale high-temperature airflow in the pre-drying chamber 10 or the post-drying chamber 20 and release them into the atmosphere. The exhaust ducts (11) and 21 are exhaust ducts from the pre-drying chamber 10 or the post-drying chamber 20. 12) (22).

The part which protrudes to the left of the pre-drying chamber 10 and the right side of the after-drying chamber 20 is the conveyor 30, and this conveyor 30 transfers by the drive | operation by the motor 31 installed under the right end of FIG. The dry matter is transferred while turning the track from the drying chamber 10 side to the post-drying chamber 20.

In the pre-drying chamber 10, the intake port 13 provided with the air filter 15 is located on the opposite side of the exhaust duct 12, and the control box 14 for controlling the drying apparatus is mounted on the roof.

2 is a cross-sectional view showing the internal structure of the pre-drying chamber 10 and the post-drying chamber 20.

The pre-drying chamber 10 and the post-drying chamber 20 are partitioned by the inner partition 1a, and the pre-drying chamber 10 is longer than the post-drying chamber 20 at about 3: 1 to 4: 1 based on the length thereof. Consists of.

Irradiation bodies 16 and 23 are arranged in a line in the pre-drying chamber 10 and the post-drying chamber 20, and these irradiating bodies 16 and 23 are provided with the ceilings of the front and rear drying chambers 10 and 20. The conveyor 30 is arranged in the box 16a, 23a inside the bottom side, and between the box 16a, 23a of the upper and lower boxes which installed the upper and lower irradiation bodies 16, 23 inside. It is installed and is going to orbit.

In the pre-drying chamber 10, a temperature sensor Ts1 (Ts2) (Ts3) for sensing the temperature at the upper, middle, and lower positions is disposed, and the upper and lower temperature sensors Ts1 (Ts2) have a high temperature (400-). 500 ℃) and the intermediate temperature sensor Ts3 detects low temperature (60 ℃).

The high temperature emitted from the top and bottom due to a failure or malfunction of the device inducing thermal breakdown to the intermediate temperature sense (Ts3) for detecting the low temperature is crazy, and if detected above the set temperature, The power cut off causes the heat to stop.

And the ceramic layer 40 is coat | covered on the inward-plate side which faces the conveyor 30 of the upper box and the lower box 16a which housed the irradiation body 16 in the pre-drying chamber 10, and this ceramic layer 40 When it receives 400-500 degreeC heat from the irradiator 16, it emits a far infrared wavelength, and this far infrared wavelength dries the to-be-dried object from the inside to the outside.

In addition, the pre-drying chamber 10 is a structure for inhaling heat from the irradiated bodies 16 and 23 radiated intensively from above and below toward the conveyor 30 to discharge into the atmosphere, as shown in FIG. A pair of air introduction holes 18 and exhaust holes 19 are formed in the left and right side walls 17a and 17b of the predrying chamber 10, respectively.

These air introduction holes 18 and exhaust holes 19 have the same size and length at positions facing each other, and are disposed at close distances from above and below with the conveyor 30 in the middle.

The air introduction hole 18 is directly connected to the inlet 13, and the exhaust hole 19 is connected through the high performance air intake 11 and the exhaust duct 12.

In such a predrying chamber 10, when the hop extractor 11 is operated, the heat in the predrying chamber 10 is forcibly inhaled. At this time, the air introduction hole 18 receives external fresh air by the draft pressure. Is inhaled.

The air sucked in this way is clean air that is thoroughly filtered by the air filter 15 of the inlet port 13, so that the dry object can be sanitarily dried.

This clean air is straight out to the outside across the conveyor 30 as soon as it enters the predrying chamber 10 due to the powerful suction power of the aspirator 11 without the time to stay in the predrying chamber 10. It is a linear heat-transmitter that exits, and at this time, the hot heat in the pre-drying chamber 10 is recovered and discharged, and at the same time, the heat radiated from the upper and lower radiators 16 is completely blocked from reaching the conveyor 30. (30) Maintain ambient temperature at room temperature.

Therefore, the atmosphere in the room temperature zone is loaded on the conveyor 30 to be dried effectively by radiation of far-infrared wavelengths emitted from the ceramic layer 40 which is not affected by the thermal interruption during transport of the object.

2 and 3 again, the after-drying chamber 20 is for subsequent treatment of the dried material effectively dried in the pre-drying chamber 10 as necessary, and the radiation or room temperature of the far-infrared wavelength as described above. The irradiation body 23 which does not have a holding | maintenance apparatus is also a normal heat transfer heater provided in line in the box 23a which has a porous plate.

Therefore, the heat that comes out here leads the high temperature atmosphere by the detection of the temperature sensor Ts4 for detecting the temperature in the after-drying chamber 20, and is much higher than the temperature atmosphere in the pre-drying chamber 10.

The after-drying room 20 finishes the epidermis of the dried material effectively dried in the pre-drying room 10 with a specific color of a degree of smoothing, and in the after-drying room 20, the post-drying room 20 is effective to shorten the staying time. 20, the length is proportionally short compared with the predrying chamber 10. As shown in FIG.

As described above, the low-temperature drying method and apparatus of the present invention effectively dry the dried product at room temperature by radiation of far infrared wavelength, thereby drying the raw material as it is without drying the high yield and destroying the intrinsic components or characteristics of the dried material. It is a very useful invention that provides the effect of long-term storage and storage.

Claims (2)

In the pre-drying room, a high temperature of 400 ~ 500 ℃ is radiated from the upper and lower irradiates toward the conveyor for transporting the dry items, and the linear trains above and below the conveyor are radiated with the far infrared wavelengths emitted from the ceramic layer. A low temperature drying method using far-infrared wavelengths, characterized in that the short-term flow is formed so that the ambient temperature of the conveyor is maintained at a high temperature blocking state and dried in a room temperature atmosphere by radiation of far-infrared wavelengths. Drying room after the pre-drying room 10 and the irradiating body 23 having the same method installed on the ceiling and the floor side with a high heat of 100 ° C. or less and a plurality of irradiating bodies 16 radiating far-infrared wavelengths in one row. 20), and the conveyor 30 is installed across the space between the upper and lower irradiation bodies 16 and 23 of each drying chamber in the longitudinal direction, and the aspirator 11 for preventing overheating inside each drying chamber. (21) in which the irradiation body (16) of the pre-drying chamber (10) is incorporated, and the film is formed on the inner plate facing the conveyor (30) side of the lower box (16a) to 400-500 deg. The upper and lower pairs of air are formed to have the same size and length just above and below the conveyor 30 on the ceramic layer 40 and the left and right sidewalls 17a and 17b which emit far infrared ray wavelengths at a high temperature. It is connected with the ball 18 and the exhaust hole 19, and the exhaust duct 12 which strongly sucks out the high temperature heat in the pre-drying chamber 10. Directly connected to the intake port 13 having the aspirator 11 and the air filter 15 to form a heat-transmitter in a straight line when the aspirator 11 draws out high-temperature heat in the predrying chamber 10. A high temperature sensing temperature sensor Ts1 disposed at the upper, lower and middle portions of the air introduction hole 18 and the exhaust hole 19 and the predrying chamber 10 and electrically connected to the control box 14 ( Ts2) and a low temperature drying device using a far infrared wavelength, characterized in that consisting of a low temperature sensing temperature sensor (Ts3).