JPH0979748A - Far infrared ray radiator and drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve almost a uniformization of the radiation of far infrared rays along the length of an air shell cylinder by inserting an outer cylinder into an outer circumference closer to the side of supplying hot air in a non- contact manner to radiate the far infrared rays anew from the outer cylinder, which receives once the far infrared rays from the hot air supply sector. SOLUTION: The inside of a box-shaped machine body 2 of a vertical circulation type grain drier 1 is sectioned into a pre-heating part 3 at an upper position and a drying part 4 at a lower position and a grain feeding device is arranged below the drying part 4. A grain hoisting device 6 is arranged outside the machine body 2 to send grains fed from the grain feeding device up to the pre-heating part 3 again. A hot air generator 28 of a far infrared rays radiator 7 is arranged outside the machine body 2 while being connected to one end of an air shell cylinder 22 and the other end of the air shell cylinder 22 is connected to one end of a hot air path. First and second outer cylinders 23 and 24 are inserted fitted into the outer circumference closer to the hot air supply side of the air shell cylinder 22 in a non-contact manner and the outer cylinder 23 is made longer than the outer cylinder 24. The outer cylinder 24 is positioned closer to the hot air supply side of the outer cylinder 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a far-infrared radiation device provided with a wind tunnel that allows hot air to pass therethrough, and a dryer mainly used for drying cereals.

[0002]

2. Description of the Related Art A circulation type grain dryer (Japanese Patent Laid-Open No. 56-82).
372, JP-A-57-124680, etc.), a hopper is arranged at the upper side, a hot air drying path and a grain feeder and fried machine for circulation are arranged at the lower side, and a fixed amount of grains is placed in the hopper. After the swelling, the grain is passed from the lower portion of the hopper portion to the hot air drying passage at a predetermined flow rate, and then returned to the hopper portion again. In the hot air drying path, moisture in the grain surface layer is removed, and tempering is performed in the hopper to move the moisture inside the grain to the surface side to make it uniform, and the moisture in the grain is gradually maintained while maintaining equilibrium. Is reduced to. This prevents deterioration of the grain and cracking of the barrel due to rapid drying.

Dry hot air is supplied to the hot air drying passage from a hot air supply device consisting of a burner and a blower, but high temperature heat produced by burner combustion is released to the outside air so as not to damage the grains to be dried. It's thinned to a proper temperature. Also,
About half of the hot air for drying is discharged as it is without drying the grains, so the energy efficiency is low. Moreover,
If the hot air is directly applied to the grains, there is a drawback that the grains are likely to be damaged such as cracked.

On the other hand, there is also a grain drying method utilizing far infrared rays. In this method, the far infrared rays radiated from the heated wind tunnel surface of the far infrared radiating device are absorbed by the grain and dried, but the electromagnetic waves are directly absorbed by the grain and most of the thermal energy is dried. Energy efficiency and less damage to cereals.

However, the wind tunnel in the conventional far-infrared radiation device has a high surface temperature on the hot air supply side connected to the hot air generating device including a burner and a blower.
The exhaust side is relatively low. For this reason, the amount of far-infrared energy applied to the grains becomes uneven depending on the location, and not only drying unevenness occurs, but also excess energy is applied to the grains in some high-temperature portions, so alteration of the grains and cracking of the barrel, etc. Was sometimes damaged.

The above can be observed not only for the drying of cereals but also for the general drying of the material to be dried which is not suitable for rapid drying.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a far-infrared radiation device in which the radiation amount of far-infrared radiation is substantially uniform in the longitudinal direction of a wind tunnel, and a drier using this far-infrared radiation device without uneven drying. Is an issue.

[0008]

[Means for Solving the Problems]

(Far-infrared radiation device) In a wind tunnel with one end being the hot air supply side and the other end being the exhaust air side, an outer cylinder is fitted in a non-contact manner on the outer periphery near the hot air supply side, thereby increasing the temperature of the wind tunnel. The far-infrared ray from the hot-air supply side portion is once received by the outer cylinder, and the far-infrared ray adjusted by the outer cylinder is radiated again.

A ventilation resistance plate is arranged inside the wind tunnel near the exhaust side, whereby the flow of hot air inside the wind tunnel is adjusted, and the heat conduction from the hot air to the surface of the wind tunnel is almost eliminated. In some cases, the far-infrared radiation device is made uniform and the far-infrared radiation distribution is made uniform in the entire far-infrared radiation device. In order to make the radiation distribution of far infrared rays uniform, it is preferable to use both the outer cylinder and the ventilation resistance plate.

[Dryer] The far-infrared radiation device having the above-described configuration is arranged in the passage of the material to be dried, and the far-infrared energy absorbed by the grain is utilized for drying. It may be combined with a hot air drying path that traverses the passage of the material to be dried, and the exhaust air from the wind tunnel of the far infrared radiation device may be connected to the hot air drying path. A preheating unit and a drying unit may be provided in the passage of the material to be dried, and the far infrared radiation device may be arranged in the preheating unit.

[0011]

1 to 3 show the entire structure of a vertical circulation type grain dryer 1, in which a box-shaped body 2 has a preheating section 3 at an upper part and a drying section 4 at a lower part. Divided and dried section 4
A grain feeder 5 such as a screw conveyor is disposed below the. A fried grain machine 6 is arranged outside the machine body 2 so that the grain fed from the grain feeder 5 is fed again to the preheating unit 3.

In the preheating section 3, a far infrared radiation device 7 is horizontally installed horizontally between a front wall 8 and a rear wall 9 of the body 2 in the lower central portion (FIG. 1), and above it in a cross section in the front-rear direction. The lower part of the preheating section 3 is formed into two hopper sections 12 (a, b) by the split fluid 10 spread in an inverted V-shape and arranged on the left and right side walls. The split fluid 10 is formed of a perforated steel plate provided with holes on the entire surface such that grains do not come out, or a steel plate without porosity.

The upper part of the preheating chamber 3 is a wide and integrated space,
It communicates with the discharge port of the fried machine 6, and the granules 13 are arranged on the ceiling. The granules 13 are driven and rotated by a motor.

The drying section 4 is formed spatially and continuously in the lower portion of the preheating chamber 3, and is in the shape of a cylinder extending horizontally from the front wall 8 to the rear wall 9 of the machine body 2 in the central portion of the lower portion. It has a hot air passage 14 and a cylindrical air exhaust passage 15 (a, b) arranged on both lower sides thereof. Reference numerals 16 and 17 are divided fluids.

The lower half wall surfaces 18 (a, b) of the hot air passage 14 and the inner side wall surfaces 19 (a, b) of the exhaust air passage 15 are formed of porous steel plates, and Exhaust path 15
The inner side wall surface 19a, similarly the lower half wall surface 18b and the inner side wall surface 19b are arranged in parallel at a narrow interval to form a hot air drying passage 20 (a, b). Hot air drying path 20
(A, b) are inclined downward toward the center, and a fixed amount feeding device 21 such as an impeller is arranged at the lower end of each.

The upper part of the drying section 4 is a wide and integrated space, and the far infrared radiation device 7 is exposed above. The lower part of the drying part 4 is formed in a hopper shape, and the grain feeder 5 is arranged at the center of the bottom part thereof.

The far infrared radiation device 7 (FIG. 4) is a wind tunnel 2
2 and first and second outer cylinders 23 and 24, ventilation resistance plate 25, hot air generator 28 including burner 26 and blower 27
The hot air generator 28 is arranged outside the machine body 2 and is connected to one end of the wind tunnel 22 and the other end (exhaust air side) of the wind tunnel 22 is blown by the hot air passage 29 through the air passage 29. It is connected to one end (hot air supply side) of the passage 14. In addition, the first and second outer cylinders 23 and 24 are fitted into the outer periphery of the wind tunnel cylinder 22 near the hot air supply side in a non-contact manner, and the first outer cylinder 23 and
Is longer than the second outer cylinder 24, and the second outer cylinder 24 is located closer to the hot air supply side of the first outer cylinder 23.

The ventilation resistance plate 25 is arranged inside the wind tunnel 22 near the exhaust side, and the cross section of the ventilation path inside the wind tunnel is about 20 to 20.
It has an area that can block 50%.

The wind tunnel 22, the outer cylinders 23 and 24, and the ventilation resistance plate 25 are made of stainless steel, and the wind tunnel 22 and the outer cylinders 23 and 24 radiate far infrared rays with high efficiency by heating ( A coating material (for example, high-efficiency radiation coating B-600 manufactured by Okitsumo Co., Ltd.) having a powder of alumina-based, silica-based, or titania-based ceramics as a pigment is applied.
When the surface temperature of the wind tunnel 22 is heated to 300 to 600 ° C., this coating has a wavelength of 2.9 to 5.0 μm from the surface.
Far infrared rays of are radiated almost uniformly. And, the grain has a characteristic of absorbing far infrared rays in this region well.

In FIG. 1, reference numeral 30 denotes an exhaust fan, which is attached to the end of the exhaust passage 15 (a, b).

In the operating grain dryer 1 (FIG. 2), the grains stuck in the preheating section 3 are divided fluid 10 and the guide body 1.
1, the hopper 12 (a, b) is gradually moved downward. During this period, and the hopper section 12 (a, b)
The grain absorbs far-infrared rays emitted by the far-infrared ray emitting device 7 while being accumulated on the upper portion of the drying unit 4 through the heat exchanger, and the energy raises the temperature of the grains from the inside.

The hot air generator 28 of the far infrared radiation device 7 is operating, and hot air is supplied to the wind tunnel 22. At this time, the wind tunnel 22 has a surface temperature distribution that is high on the hot air supply side and low on the exhaust air side due to the change in the amount of heat of the hot air passing through the wind tunnel 22. However, since the outer cylinders 23 and 24 are fitted on the outer periphery of the wind tunnel 22 on the hot air supply side, the outer cylinders 23 and 24 receive far-infrared rays from the high temperature portion of the wind tunnel 22 and are themselves far away. It becomes a form that emits infrared rays. Further, since the outer cylinders 23 and 24 are fitted to the wind tunnel 22 and in a non-contact state with each other, that is, they are fitted with an air layer, the energy from the high temperature portion of the wind tunnel 22 is diffused. However, the surface temperature of the outer cylinders 23 and 24 becomes lower than the high temperature portion of the wind tunnel cylinder 22.

For this reason, the thickness of the air layer and the outer cylinders 23, 24
The far-infrared radiation amount of this portion can be adjusted to almost the same amount as the other portions of the wind tunnel 22 by adjusting the length of the. In particular, a portion having a high temperature can be dealt with by multiplying the first outer cylinder 23 and the second outer cylinder 24 such that the outer cylinders are in non-contact with each other. It should be noted that the length of each of the multiple outer cylinders may be arbitrarily selected in accordance with the temperature control. In some cases, the outer cylinders may have the same length, or the outer cylinder on the side close to the wind tunnel cylinder 22 (the first outer cylinder). The cylinder 23) may be shorter than the outer cylinder (second outer cylinder 24) fitted outside thereof.

The surface temperature distribution of the wind tunnel 22 is as follows.
It can also be adjusted by the ventilation resistance plate 25 arranged inside the exhaust side. In other words, the hot air inside the wind tunnel due to the ventilation resistance plate 25 is agitated due to turbulent flow due to the ventilation resistance 25, and the heat conduction time to the wall surface of the wind tunnel 22 becomes longer, so the surface temperature of the wind tunnel 22 is increased. It can be raised near the ventilation resistor 25.

The surface temperature distribution of the wind tunnel 22 is adjusted by the outer cylinders 23 and 24 or the ventilation resistor 2 as described above.
Although each of 5 can be used, it is preferable to combine both. In any case, the outer cylinders 23 and 24 and the ventilation resistance plate 25 are means for equalizing the temperature on the surface of the wind tunnel cylinder.

The grains transferred to the drying section 4 are
In accordance with 17, the hot air drying path 20 (a, b) is guided and slowly moved downward. During this time, from the hot air passage 14 to the exhaust air passage 15 (a, b), the hot air drying passage 20 (a,
Hot air blown across b) (temperature controlled)
Removes water. At this time, the grains are preheated to the inside by the far-infrared radiation device 7 so that the movement of the internal moisture is active, and the internal moisture is evenly moved to the surface layer portion. Efficiency is higher than usual. Further, drying is also performed with little unevenness for each grain.

Exhaust air from the far-infrared radiation device 7 is supplied to the hot air passage 14 from the wind tunnel 22 of the far-infrared radiation device 7 through the air passage 29, and the exhaust air containing moisture in the hot-air drying passage 20 is discharged. It is sucked by the exhaust fan 30 through the exhaust path 15 (a, b) and is discharged to the outside. In this method, the waste heat of the far-infrared radiation device 7 can be effectively used, and the adjustment amount of the temperature of the hot air supplied to the hot air passage 14 is reduced, so that the thermal efficiency is higher than that of the normal hot air drying.

The grains that have passed through the hot air drying path 20 (a, b) are collected in the grain feeder 5, sent to the grain elevator 6 by the grain feeder 5, and transferred to the preheating unit 3 again. It This circulation
The process is performed until the water content reaches a predetermined level.

As in this embodiment, when the preheating section 3 by the far infrared radiation device 7 is arranged on the upper part of the machine body 2 and the drying section 4 having the hot air drying path 20 is arranged on the lower part, the existing hot air drying is performed. It is economical because it is only necessary to place the far-infrared radiation device 7 on the upper part of the grain storage chamber using a machine. Further, when the far-infrared radiation device 7 is arranged in the upper part of the grain storage room, there are few objects such as a steel plate that interfere with far-infrared radiation below.
Far infrared rays can be used efficiently.

It is also possible to dry the grain (the material to be dried) only by irradiation with far infrared rays without performing hot air drying.

5 to 8 show another embodiment relating to the far-infrared radiation device 7, in which a sub-cylinder 31 is provided on the exhaust side of the wind tunnel 22.
Is connected at one end thereof and is arranged in parallel with the wind tunnel 22. The other end of the sub cylinder 31 is connected to one end of the hot air passage 14 via the air passage 29.

In this embodiment, the hot air generator 28 is located on the front wall 8 side (FIG. 6), but the amount of heat dissipated by the sub tube 31 is supplemented in accordance with the action of far infrared rays from the wind tunnel tube 22. Can be used. The sub-cylinder 31 is also made of stainless steel similarly to the wind tunnel 22, and the highly efficient far-infrared radiation paint may be applied to at least the outer peripheral surface thereof.

FIG. 7 shows the ventilation resistance plate 25 inside the wind tunnel 22 of the far infrared radiation device 7 having the sub-cylinder 31. Further, the outer cylinders 23 and 24 are visible in FIG. The above is an example of the embodiment, and the heat source of the hot air generator may use electric heat other than the burner.

[0034]

According to the first and fifth aspects of the invention, the amount of far infrared rays emitted from the far infrared ray emitting device is made substantially uniform in the longitudinal direction of the wind tunnel by the outer cylinder or the ventilation resistance plate. be able to. According to the configuration of claim 2,
By combining the outer cylinder and the ventilation resistor, the amount of far-infrared rays emitted by the far-infrared radiation device can be made more uniform in the longitudinal direction of the wind tunnel cylinder.

According to the third and fourth aspects, it is possible to appropriately deal with the high temperature portion of the wind tunnel with a simple structure, and to control the amount of far infrared rays emitted by the far infrared ray emitting device. It can be made substantially uniform in the longitudinal direction of the wind tunnel. According to the configuration of claim 6, the radiation amount of far infrared rays is increased,
It can efficiently act on the grain.

According to the structure described in claim 7, the amount of heat generated by the sub-cylinder can be supplemented to the action of the far infrared rays generated by the wind tunnel, and the drying operation can be efficiently performed. According to the structure of claim 8, compared with hot air drying, the material to be dried is gently dried, and there is less risk of degrading or damaging the material to be dried.

According to the structure described in claim 9, it is possible to obtain a dryer having high thermal efficiency. According to the structure described in claim 10, the object to be dried can be efficiently dried by the combination of the overall preheating of the object to be dried by far infrared rays and the forced moisture removal action by the hot air drying.

[Brief description of drawings]

1] Partially cutaway side view of a grain drying device

FIG. 2 is a vertical sectional view of a grain drying device.

FIG. 3 is a front view of the grain drying device.

FIG. 4 is a side view of the far infrared radiation device.

FIG. 5 is a plan view of a far infrared radiation device (another embodiment).

FIG. 6 is a partially cutaway side view of a grain drying device (another embodiment).

FIG. 7 is a sectional view taken along the line AA in FIG.

FIG. 8 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 1 Grain dryer 2 Airframe 3 Preliminary drying section 4 Drying section 5 Grain feeder 6 Grain cultivator 7 Far infrared radiation device 8 Front wall 9 Rear wall 10 minutes Fluid 11 Guide body 12 (a, b) Hopper section 13 Granule 14 hot air passage 15 (a, b) exhaust air passage 16 minute fluid 17 minute fluid 18 (a, b) lower half wall surface 19 (a, b) inner side wall surface 20 (a, b) hot air drying passage 21 quantitative delivery device 22 wind tunnel 23 first outer cylinder 24 second outer cylinder 25 ventilation resistance plate 26 burner 27 blower 28 hot air generator 29 air duct 30 exhaust fan 31 sub-cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kashiwasaki Masaru 1-40, Nisshin-cho, Omiya-shi, Saitama Prefecture 2 Biological specific industrial technology research promotion mechanism (72) Inventor Tomohiko Ichikawa 1-chome, Nisshin-cho, Omiya-shi, Saitama 40 Address 2 Biological Specific Industrial Technology Research Promotion Organization (72) Inventor Kazunari Zoka 4-7-2 Sotokanda Chiyoda-ku, Tokyo Satake Manufacturing Co., Ltd. (72) Inventor Hiroyuki Tashiro Fukuroi, Shizuoka Prefecture 1 of 4 Yamanamachi Shizuoka Machinery Co., Ltd.

Claims (10)

[Claims] 1. A wind tunnel having one end as a hot air supply side and the other end as an exhaust side, and an outer cylinder fitted in a non-contact manner on the outer periphery of the wind cylinder near the hot air supply side, the outer cylinder being A far-infrared radiation device characterized by being used as a temperature equalizing means. 2. A wind tunnel having one end on the hot air supply side and the other end on the exhaust air side, and an outer tube and a wind tunnel that are fitted in a non-contact manner on the outer periphery of the wind tunnel near the hot air supply side. A far-infrared radiation device comprising a ventilation resistance plate disposed inside the windward side, wherein the outer cylinder and the ventilation resistance plate serve as temperature equalizing means. 3. The outer cylinder is multiply fitted in a non-contact manner to the outer periphery of the wind tunnel cylinder near the hot air supply side, and is described in claim 1. Far infrared radiation device. 4. A first outer cylinder fitted in a non-contact manner to an outer circumference of a wind tunnel cylinder main body near a hot air supply side, and a non-contact outer circumference of a first outer cylinder near a hot air supply side. It has a 2nd outer cylinder fitted in contact shape, It is characterized by the above-mentioned.
Far-infrared radiation device described in any one of. 5. A wind tunnel having one end on the hot air supply side and the other end on the exhaust side, and a ventilation resistance plate disposed inside the wind tunnel near the ventilation side, wherein the ventilation resistance plate has a uniform temperature. Far-infrared radiation device characterized by being used as a conversion means. 6. The far-infrared radiation according to claim 1, wherein at least the outer surface of the wind tunnel is coated with a paint that radiates far-infrared with high efficiency. apparatus. 7. The sub-cylinder is connected to the wind tunnel side of the wind tunnel, and is arranged in parallel with the wind tunnel.
The far-infrared radiation device according to claim 6. 8. A dryer, wherein any one of the far-infrared ray emitting devices according to claim 1 is arranged in a passage of an object to be dried. 9. A far-infrared radiation device according to any one of claims 1 to 7 is arranged in the passage of the material to be dried, and a hot air drying passage is formed across the passage of the material to be dried. A dryer characterized in that a hot air generator is connected to a hot air supply side of a wind tunnel of the far-infrared radiation device, and an exhaust side of the wind tunnel is connected to a hot air drying path. 10. A dryer, characterized in that a preheating section and a drying section are provided in the passage of the material to be dried, a far infrared radiation device is arranged in the preheating section, and a hot air drying path is formed in the drying section. .