JPH0522834B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention efficiently dries circulating grain in a short time without causing shell cracking by the combined action of far-infrared radiant heat and drying hot air. Regarding grain drying equipment.

[Prior Art] Conventionally, a grain drying device that promotes drying by circulating drying hot air through the grain circulating along a drying path to remove moisture from the surface of the grain is based on the present invention. Before application, for example, Japanese Patent Publication No. 48-
This method is known as described in Japanese Patent No. 36753.

[Problems to be Solved by the Invention] By the way, in conventional grain drying devices of this type, drying hot air of a considerable temperature is applied to the grains to remove moisture on the surface of the grains and at the same time raise the temperature of the grains. The aim was to accelerate drying by causing the moisture inside the grain to diffuse and move toward the surface.

Therefore, when the drying hot air temperature is set to a high temperature in order to make the moisture diffusion movement inside the grain more active and shorten the drying time, the rate of surface moisture dissipation and the rate of moisture diffusion movement from the inside to the surface will decrease. This imbalance causes a so-called shell-cracking phenomenon in which only surface moisture quickly evaporates, and the quality of the grain deteriorates significantly, resulting in unpalatable rice.

Therefore, in conventional grain drying, in order to prevent grain cracking and obtain delicious rice, ventilation drying is carried out while keeping the drying hot air temperature in the range of approximately 40℃ to 55℃, and the surface moisture is released by ventilation drying. After the grain is removed, it is stored until the next drying.
The grains were allowed to stand for about 1 to 2 hours without being exposed to dry hot air, and a so-called humidity conditioning period was provided during which the moisture inside the grains was quickly diffused toward the surface.

Therefore, in the case of drying grains using only the circulation action of dry hot air, it becomes difficult to dry without eliminating the humidity adjustment time, making it impossible to shorten the overall drying time. The problem is that it takes a long time.

This means that the internal temperature of the grain cannot be heated to a higher temperature than the surface temperature by the flow of dry hot air alone, so the rate of diffusion of moisture from the interior to the surface is higher than the rate of moisture dissipation from the surface. This is due to the fact that it is slower.

In the present invention, far-infrared radiant heat generated by the combustion hot air of a burner and dry hot air obtained by mixing the combustion hot air and wind are simultaneously exposed to the grain circulating and flowing inside the dryer main body. The heat absorption action quickly warms the inside of the grain, promoting the diffusion and transfer of internal moisture, and the moisture diffused to the surface is quickly dissipated and removed by the circulating dry hot air, thereby shortening the humidity conditioning time. To provide a grain drying device capable of drying grain in a short time without causing shell cracking even if drying work is continuously performed without any provision.

[Means for Solving the Problems] In order to achieve the above object, in the grain drying apparatus of the present invention, a storage chamber, a far-infrared ray generation chamber, and a take-out chamber are sequentially arranged in the dryer main body from the upper stage to the lower stage. A far-infrared generator is installed in the far-infrared ray generation chamber, which is installed three-dimensionally and has a bent flame tube with a burner connected to the starting end and a hot air outlet on the end side opening into the far-infrared ray generation chamber. In addition, on the left and right sides of the far-infrared generation chamber, there are provided a drying passage whose upper end is connected to the storage chamber and whose lower end is connected to the extraction chamber, and an exhaust passage that communicates with the outside via a suction exhaust device. be.

In addition, the far-infrared ray generation chamber is partitioned with a porous reflective wall so that the center becomes an intake passage communicating with the left and right far-infrared ray generation chambers, and far-infrared ray generators are installed in the left and right far-infrared ray generation chambers, respectively. This allows for effective grain drying.

[Function] Now, in FIGS. 1 to 3, after filling the accommodation chamber 3 and the drying passages 15, 15 with a predetermined amount of grain, the burner 13 is operated and the hot combustion air is transferred to the far-infrared generator 11. After flowing through the bent flame cylinder 12, the far-infrared ray generating chamber 4 is introduced from the terminal side 14.
Make it squirt inside. Then, due to the radiant action of the circulating hot combustion air, a predetermined amount of far-infrared radiant heat is radiated from the far-infrared generator 11 toward the grains filled in the drying passage 15, heating the grains from inside and Moisture diffusion movement that quickly moves moisture toward the surface is performed.

Once the far-infrared radiant heat is radiated to the grain as described above, the suction/exhaust device 18 and each operating member of the grain dryer 1 are operated, and the suction air sucked through the intake window 10 is transferred to the far-infrared generation chamber. 4 through the drying passage 15 and toward the exhaust passages 17, 17. Then, the suction air is stirred and mixed with the hot combustion air directly exhausted into the far-infrared generation chamber 4, and becomes dry hot air at an appropriate temperature in the far-infrared generation chamber 4, passing through the drying passage 15 to the exhaust passage. 17, the moisture exuding on the surface of the grain is quickly dispersed and removed by the circulating dry hot air.

Therefore, if the filled grains are circulated many times through the storage chamber 3, the drying passage 15, the take-out chamber 5, and then returned to the storage chamber 3, the grains will be radiated by the far-infrared generator 11. Due to the heating effect of the far-infrared radiant heat and the moisture dissipation and removal effect of the circulating drying hot air, the product is finished and dried to a predetermined moisture content in a short time without causing shell cracking.

In addition, in FIGS. 4 and 5, the outside air taken into the intake passage 23 passes through the respective porous reflection walls 24 and 24 into the left and right far-infrared generation chambers 4a and 4b. After the air is taken in and the far-infrared generators 11, 11 are cooled from the outside, it is stirred and mixed with the combustion hot air exhausted from the far-infrared generators 11, 11 to become dry hot air at an appropriate temperature, so the far-infrared radiant heat is Not only does the temperature increase due to the cooling effect and reflected heat, but the temperature of the drying hot air also becomes higher, making it possible to dry the grains in a shorter time.

[Example] Examples will be described with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a grain drying device that can efficiently dry grain circulating and flowing along a drying passage 15 using far-infrared radiant heat and drying hot air. The grain drying apparatus 1 is constructed as follows.

That is, inside the dryer main body 2, which has an oblong rectangular cylindrical shape, there are a storage chamber 3 for storing grains from the upper stage to the lower stage, and a far-infrared ray generation chamber for generating a heat source for drying the grains. 4 and a take-out chamber 5 for taking out the somewhat dried grains are successively arranged three-dimensionally. The far-infrared ray generating chamber 4, which is arranged along the front and rear longitudinal direction in the lower part of the storage chamber 3, has large reflective wall plates 6, 7, 8 at the top, bottom and rear, and porous walls on both the left and right sides. 9 (wire mesh may also be used), and an intake window 10 on the front side.
It is formed in the shape of a cavity with an opening.

A far-infrared generator 11 for emitting far-infrared rays having a wavelength of 20 μ or more is housed along the longitudinal direction in the far-infrared ray generating chamber 4, and this far-infrared generator 11 A burner 13 is connected to the starting end side of a bent flame tube 12 whose inner peripheral surface is both black, and the distal end side 14 is opened into the far-infrared ray generating chamber 4. On both the left and right sides of the far-infrared generating chamber 4, left and right drying passages are formed by porous walls 9, 9 and porous walls 16, 16 vertically installed at an appropriate interval on the outside of the porous walls 9, 9. 15, 15 are arranged vertically, and the upper end sides of the left and right drying passages 15, 15 are in the storage chamber 3,
In addition, the lower end side is rotatable feeding rolls 25, 25.
They are respectively connected to the extraction chamber 5 through the.

Reference numerals 17, 17 denote left and right exhaust air passages arranged outside the left and right drying passages 15, 15, and the air exhaust passages 17, 17 are connected to a suction passage arranged on the rear side of the dryer main body 2. It is connected to the air exhaust device 18, and directs dust and exhaust hot air away from the machine to centrally exhaust the dust. At the bottom of the unloading chamber 5, an unloading screw 19 that can freely rotate along the longitudinal direction is mounted on a storage shaft. At the same time, the upper part of the elevator 20 is connected to the starting end side of a carry-in gutter 21 in which a carry-in screw 22 is rotatably housed, thereby circulating and flowing the grain.

The grain drying device 1 shown in FIGS. 4 and 5 uses far-infrared radiant heat at a higher temperature than that of the grain drying device 1 shown in FIGS. 1 to 3 to dry grain. This is an embodiment in which more efficient drying is attempted, and in the grain drying apparatus 1 of this embodiment, an intake passage 23 whose one end communicates with the intake window 10 is formed in the center of the far-infrared generator 4. In addition, the inside of the far-infrared generation chamber 4 is partitioned by two porous reflective walls 24, 24 to form far-infrared generation chambers 4a, 4b on both the left and right sides, and at the same time, the far-infrared generation chambers 4a, 4b on the left and right sides are partitioned. Inside, far infrared ray generators 11 and 11 are housed and installed,
Far-infrared radiant heat and drying hot air are radiated or distributed toward the respective drying passages 15, 15.

Therefore, in the grain drying apparatus shown in FIGS. 1 to 3, during drying, a predetermined amount of grain is first filled into the accommodation chamber 3 and the left and right drying passages 15, 15 through the elevator 20 and the carry-in gutter 21. After that, the burner 13 is operated to circulate hot combustion air along the bent flame cylinder 12, and then the air is blown into the far-infrared generation chamber 4 from the end side 14, and at the same time, the suction and exhaust device 18 is started. Then, due to the negative pressure action of the suction/exhaust device 18, outside air is drawn into the far-infrared ray generating chamber 4 through the intake window 10, and mixed with the hot combustion air to become dry hot air at an appropriate temperature. On the other hand, due to the combustion heating of the burner 13 and the cooling effect of the circulating suction air, a predetermined amount of far-infrared radiant heat is emitted from the far-infrared generator 11 to the drying passage.
5, 15, so the drying passage 15,
The grains in No. 15 are heated from the inside by far-infrared radiant heat to promote the diffusion and movement of internal moisture, and the moisture exuding to the surface is removed and dried by the circulating dry hot air.

Therefore, the grains are caused to flow down into the unloading chamber 5 by the rotational unwinding action of the unwinding rolls 25, 25,
If this circulation flow action, which returns to the storage chamber 3 through the carry-out screw 19, the elevator 20, and the carry-in screw 22, is performed multiple times, the grain is finished and dried to a predetermined moisture content without causing shell cracking. .

In addition, in the grain drying apparatus shown in FIGS. 4 and 5, after outside air is drawn into the intake passage 23 due to the negative pressure generated by the operation of the suction/exhaust device 18,
The sucked outside air passes through the porous reflectors 24, 24 and is sucked into the left and right far-infrared generation chambers 4a, 4b, and efficiently cools the far-infrared generators 11, 11 housed therein, so far-infrared rays are not emitted. As the heat increases, the combined effect of reflected heat causes even higher temperatures to be applied to the grains, further accelerating the diffusion and movement of moisture in the grains, and the synergistic effect with the circulating hot air in the drying room causes the grains to crack in a short period of time. It can be dried efficiently without any problems.

[Effects of the Invention] Since the present invention is configured as described above, it produces effects as described below.

Grain circulated along the drying passage 15 absorbs far-infrared rays using the combustion hot air emitted from the far-infrared generator 11 as a radiant heat source in the course of its flow, and quickly heats the inside of the grain with converted thermal energy. This may be due to the fact that it can speed up the diffusion and transfer rate of moisture and promote the transfer of internal moisture to the surface.
Moisture seeping out on the surface can be simultaneously released and removed by dry hot air generated by mixing the combustion hot air discharged from the hot air outlet 14 provided at the end of the far-infrared generator 11 with the circulating air. , even if the humidity conditioning time for controlling the humidity inside the grain during drying work is omitted, as in conventional grain drying equipment,
Grain can be dried efficiently in a short time without causing grain cracking, and the combustion hot air of the burner 13 simultaneously generates high-temperature far-infrared radiant heat and drying hot air, saving fuel consumption and drying. In addition to easily achieving the simplification of the device and the cost reduction of the product, the inside of the far-infrared generation chamber 4 is partitioned by porous reflective walls 24, 24, and an intake passage 23 is provided in the center.
, and far infrared generators 11, 11 on both the left and right sides.
When the left and right far-infrared generating chambers 4a and 4b containing the
Far infrared generator 1 with the intake air flowing through a and 4b
1 and 11, the far-infrared radiant heat energy is further increased, the grain temperature rises more quickly, and drying can be accelerated.

[Brief explanation of drawings]

The drawings show each embodiment of the grain drying apparatus according to the present invention, and FIG. 1 is a longitudinal sectional front view, and FIG.
The figure is a side view with main parts cut away, Figure 3 is a cross-sectional plan view taken along line A-A in Figure 2, Figures 4 and 5.
The figure shows another example of grain drying equipment,
FIG. 4 is a cross-sectional plan view, and FIG. 5 is a vertical cross-sectional front view of only the far-infrared generation chamber. 1...Grain drying device, 2...Dryer main body, 3...
... Containment room, 4... Far infrared ray generation room, 4a, 4b...
...Left and right far infrared ray generation chambers, 5... Retrieval chamber, 11
...Far-infrared generator, 12...Bent flame tube, 14...
...Hot air exhaust port installed at the end of the far-infrared generator,
15...Drying passage, 17...Exhaust passage, 23...
Intake passage, 24... porous reflective wall.

Claims (1)

[Scope of Claims] 1. A storage chamber, a far-infrared ray generation chamber, and a take-out chamber are sequentially stacked three-dimensionally in the dryer main body from the upper tier to the lower tier, and a burner is installed on the starting end side of the far-infrared ray generation chamber. A far-infrared generator with a bent flame tube that opens into the far-infrared generation chamber is installed at the hot air outlet on the terminal side, and on the left and right outside of the far-infrared generation chamber, the upper end is connected to the storage chamber, and 1. A grain drying device comprising: a drying passage whose lower end side is connected to a take-out chamber; and an exhaust passage which communicates with the outside via a suction exhaust device. 2. The far-infrared ray generation chamber is partitioned by a porous reflective wall so that the center serves as an intake passage communicating with the left and right far-infrared generation chambers, and far-infrared ray generators are installed in each of the left and right far-infrared ray generation chambers. A grain drying apparatus according to claim 1.