KR20130021744A - Heat recoverying type's circulating grain dryer - Google Patents

Abstract

PURPOSE: A grain drying machine is provided to enhance drying efficiency within a grain drier and chamber by moving only grains into grain drying machine after removing foreign substance and husk. CONSTITUTION: A circular grain drying machine of exhaust heat recovery system is formed with a upper hopper(10) which has a foreign substance outlet(11) in one side of wall; a foreign substance separating device(20) which outlets foreign substance included among grains(1) passing through inside of upper hopper by inhaling and blasting air toward a foreign substance inhaling outlet; an air supply chamber(32) supplied with air in one side of grains pass chamber(31), an air exhaust chamber(33) which exhausts air in the other side of a grain pass chamber; several holes formed in the wall of grains pass chamber to inject air from an air supply chamber and outlet through grain pass chamber; a main body(30) formed with grain store chamber in upper side of grain pass chamber, air supply chamber, and air exhaust chamber; a grain dispersion device(34) formed to let grains be injected inside the main body fall by evenly dispersing; a lower hopper(50) with an outlet(51) formed in the lower hopper; an exhaust controller(70) formed to control the exhausting amount of grain through lower hopper; a moisture meter(90) formed to measure the water content percentage of grains; a bucket elevator(80) formed to supply grains exhausted from lower hopper to upper hopper; and an air supply pipe connected with one side of air supply pipe installed with an air exhaust chamber of main body. A vertical agitator(40) comprises a vertical pivot(41), an agitating blade(42), and a rotating apparatus(43).

Description

Heat recovery type's circulating grain dryer

The present invention relates to a grain dryer, and more particularly, to recover the arrangement using a heat exchanger, as well as to allow the grain to be evenly dried by moving down the grain passing chamber in the vertically installed grain through the heat recovery method, Circulating grain dryer

In general, grains such as rice and barley harvested from mountain areas must be dried prior to storage and transportation until they reach consumers.

This is because the water content of green whole grains harvested from the mountain area is more than 50%, and general grains have a high water content of 20 to 30%, which is easily deteriorated or deteriorated, resulting in deterioration and quality loss of grain.

Therefore, grains should be dried to have a water content of about 15% for safe storage, transportation and preservation of the food immediately after harvesting.

To date, a circular grain dryer is widely used. The circular grain dryer is a device for drying and lowering the moisture content of rice or barley to a certain level by forcibly circulating direct hot air from kerosene burners in grains such as rice or barley.

However, the above-described circulating grain dryer heats the sucked air with a burner, and since the heated air passes through the grain layer together with the burner combustion gas to dry the grain and discharge it to the outside, it is low in energy efficiency and high in fuel consumption. .

In addition, by setting the temperature of the drying hot air in order to increase the drying speed, there is a problem that the taste of grains due to high temperature drying is lowered and the copper percentage is high.

As a recent technology, the "ultra-large-infrared circular grain dryer and grain drying method for reducing moisture content variation between grain layers in a storage room" (Korean Patent Publication No. 10-705710, Patent Document 1), page 19, FIG. A technique is disclosed in which grains introduced into the storage room are dried while passing through a plurality of grain moving passages where far infrared rays are radiated and hot air is introduced.

However, the above-mentioned technology is that when foreign substances such as shells and dust peeled off into the grains introduced into the storage compartment are simultaneously introduced into the grain moving passages for drying the grains, the foreign matters stick to the walls of the passages, thereby providing a smooth air circulation. There is a problem in that the drying efficiency is not lowered or the unnecessary outer shell is dried.

In addition, when the steamed green whole grains are dried, mucus is generated in the grains themselves, so that grains introduced into the grain passages may be attached to the inside of the passages, and sometimes grains are attached to form agglomerates, which cause grains to pass through. There was a problem that occurs when the stagnation inside it becomes impossible to operate the dryer.

KR 10-0705710 (2007.04.03)

The circulating grain dryer of the heat recovery method of the present invention is to solve the problems occurring in the prior art as described above, and installs a foreign matter separating device on one side of the upper hopper, which is generated while being separated from the foreign matter mixed with grains and drying. It is intended to improve the drying efficiency in the grain passing chamber by removing only the outer husk and the like so that only the grain is moved into the grain dryer.

In addition, by installing a plurality of vertical stirrer in each grain passing chamber to ensure that the grain flowing into the grain passing chamber smoothly moved downward, the grain is uniformly dried.

At this time, the plurality of vertical stirrers are to be connected to each other by a chain or the like to operate by a single motor to facilitate the construction and production of grain dryer.

In particular, the grain dryer is to be connected to the heat exchanger to be operated in a manner that the circulation operation and the heat recovery operation in parallel with the humidity of the drying air to have a superior thermal efficiency than the conventional grain dryer.

In order to solve the problems as described above, in order to solve the above problems, the circulation recovery dryer of the present invention is configured such that the grain to be dried at the top and the grain fed to the bottom are discharged, and a foreign material suction discharge outlet is formed at one wall. An upper hopper; A foreign matter separation device connected to one side of the upper hopper so as to blow air to the foreign substance suction discharge port side so that foreign substances contained in the grain passing through the upper hopper are sucked into the foreign substance suction discharge port side and discharged; It is connected to the upper hopper is configured to introduce grain into the inside, there is formed a plurality of grain passage chamber is opened in the upper and lower, the air supply chamber is formed on one side of the grain passage chamber is supplied air The other side of the grain passage chamber is formed with an air discharge chamber through which air is discharged. A plurality of holes are formed in the wall of the grain passage chamber so that air is introduced from the air supply chamber and discharged through the air discharge chamber. The grain passing chamber, the air supply chamber and the air discharge chamber include a main body having a hollow grain storage chamber formed thereon; It is installed on the top of the main body, the fungus and configured to drop evenly distributed grains introduced into the main body; A lower hopper installed in the lower portion of the main body, the grain falling through the grain passing chamber and flowing in, and having a discharge port formed in the lower portion thereof; A discharge controller installed at the lower hopper outlet and configured to adjust an amount of grain discharged through the lower hopper; A moisture content meter installed at one side of the lower hopper to measure a moisture content of the grain; A bucket elevator having one side connected to the outlet of the lower hopper and the other side connected to the upper hopper to supply grain discharged from the lower hopper to the upper hopper; An air supply pipe connected to the air supply chamber of the main body and having a fan installed at one side thereof; An air discharge pipe connected to the air discharge chamber of the main body; A circulation connecting pipe connecting the air supply pipe and the air discharge pipe; A damper installed at each of the air supply pipe, the air discharge pipe, and the circulation connection pipe; One side is connected to the air supply pipe, the other side is a heat exchanger is connected to the air discharge pipe; characterized in that it comprises a.

At this time, the lower portion is composed of a vertical rotation shaft configured to rotate vertically inserted into the grain passage chamber, a stirring blade installed on the outer peripheral surface of the vertical rotation shaft and a rotating device for rotating the vertical rotation shaft grains introduced into each grain passage chamber A vertical stirrer configured to stir; and the rotating device includes: a belt or a chain connected to an upper portion of each vertical rotating shaft inserted into the grain passing chamber; It is characterized in that consisting of; a rotary motor connected to the belt or chain to rotate.

In addition, a plurality of horizontal rotating shaft which is installed horizontally in the lower hopper, and an auxiliary stirring device installed on the outer peripheral surface of the horizontal rotating shaft and the auxiliary rotating device for rotating the horizontal rotating shaft configured to stir grains introduced into the lower hopper. Horizontal stirrer; characterized in that is installed.

In addition, the grain passage chamber is characterized in that the passage amount adjusting means is installed on the wall of the grain passage chamber in order to control the falling passage speed of the grain introduced into the grain passage chamber.

According to the present invention, by installing a foreign matter separation device on one side of the upper hopper to remove foreign matters such as the outer shell mixed with the grains so that only the grains are moved into the grain dryer to improve the drying efficiency in the grain passing chamber.

In addition, by installing a plurality of vertical stirrers in each grain passing chamber, the grains introduced into the grain passing chamber may be smoothly moved to the bottom, and the grains may be uniformly dried.

At this time, the plurality of vertical stirrers are connected to each other by a chain or the like to operate by a single motor to facilitate the construction and production of grain dryer.

In particular, the grain dryer is connected to the heat exchanger to operate in a manner of circulating or recovering the arrangement in accordance with the humidity of the air it is possible to have a superior thermal efficiency than the conventional grain dryer.

1 is a schematic perspective view of the circulation recovery dryer of the heat recovery method of the present invention.
Figure 2 is a schematic cross-sectional view of one side of the circulating grain dryer of the heat recovery method of the present invention.
Figure 3 is a schematic cross-sectional view of the other side of the circulation recovery dryer of the heat recovery method of the present invention.
Figure 4 is a schematic diagram showing a connection state of the heat exchanger in the circulating grain dryer of the plurality of heat recovery system of the present invention.
Figure 5 is a conceptual diagram showing the air flow in the grain passing chamber in the present invention.
Figure 6 is a cross-sectional view showing an installation example of the passage amount adjusting means in the present invention.

Hereinafter, a circulating grain dryer of the heat recovery method of the present invention will be described in detail with reference to the accompanying drawings.

The circulating grain dryer of the waste heat recovery method of the present invention is largely the upper hopper 10, the foreign matter separation device 20, the main body 30, the fungus 34, the vertical stirrer 40, the lower hopper 50, horizontal It is composed of a stirrer 60, discharge controller 70, moisture content meter 90, bucket elevator 80, air supply pipe 100, air discharge pipe 110 and heat exchanger 120.

As shown in FIG. 1, the upper hopper 10 is open at the top and the bottom thereof so that the grain 1 to be dried from the top is input, and the grain 1 is discharged to the lower portion thereof, and the grain 1 is discharged into the main body 30. 1) is configured to flow.

At this time, the lower side of the upper hopper 10 is formed with a foreign matter suction outlet 11 is discharged.

The foreign matter separation device 20 is connected to the lower side of the upper hopper 10, as shown in Figure 1 and 2, and blows air to the blower fan 12 to the foreign matter suction outlet 11 side to the upper hopper ( 10) The foreign matter such as the outer shell contained in the grain (1) passing through the outlet side is configured to be sucked and discharged to the foreign matter suction outlet 11 side.

The foreign matter separation device 20 is preferably made of a conventional blowing fan 12 and a suction fan (not shown), the foreign matter suction outlet 11 is open so that the air blown by the opposite side blowing fan 12 is introduced. It is desirable to.

In addition, the foreign matter suction outlet 11 is preferably configured to suck the foreign matter contained in the grain 1 is provided with a suction fan (not shown).

The blower fan 12 preferably has a blowing speed such that the grains 1 fall down and foreign matters such as outer shells lighter than the grains 1 can be blown off by the wind.

In addition, the suction fan (not shown) also preferably has a flow rate or suction wind speed having a suction force such that the foreign matter flying to the foreign matter suction discharge port 11 side can be sucked smoothly.

The main body 30 is connected to the upper hopper 10 as shown, so that the grain (1) is introduced into the interior through the upper hopper (10).

In addition, a plurality of grain passing chambers 31 having upper and lower openings are formed in the body 30 so that the grains 1 introduced into the body 30 are dispersed into the respective grain passing chambers 31. It is configured to move downward.

In particular, an air supply chamber 32 through which air is supplied is formed at one side of the grain passing chamber 31, and an air discharge chamber 33 through which air is discharged is formed at the other side of the grain passing chamber 31. The wall surface of the grain passing chamber 31 is formed of a perforated plate or a mesh network so that air is introduced from the air supply chamber 32 and then discharged through the air discharge chamber 33.

In particular, the body 30 is characterized in that the grain passing chamber 31, the air supply chamber 32 and the air discharge chamber 33, the grain storage chamber formed with a hollow portion 35 is formed on the top.

If the grain passing chamber 31, the air supply chamber 32, and the air discharge chamber 33 are formed up to the upper portion of the hollow part 35 of the body 30, the grain ( Even if 1) is filled in, the volume of the grain 1 itself is reduced during the drying process, and the foreign matter such as the outer shell is separated and discharged, thereby reducing the total volume of the dried grain, so that the upper portion of the grain passage chamber 31 Since the grain 1 is not filled and becomes an empty space, the air supplied from the air supply chamber 32 is easily introduced into and discharged from the upper portion of the grain passage chamber 31 filled with the grain 1, and as a result, The contact between the grain (1) and the dry air is reduced, thereby reducing the drying efficiency.

In the drying process of the grains 1, the grains 1 should be sufficiently fed from the beginning of drying so that the grains 1 may be stacked over the grain passing chamber 31 continuously, and thus, air for drying the grains 1 may be used. The supply and discharge of is to be made in the lower space of the main body 30 to improve the drying efficiency.

As shown, the fungus 34 is installed on the inner upper portion of the main body 30, that is, the upper portion of the grain passage chamber 31, and a plurality of plates having a hat shape are alternately installed to form a plurality of upper hoppers. It is comprised so that it may evenly disperse | distribute and fall the grain 1 which descend | falls from 10 and flows into the main body 30.

As shown in the drawing, a plurality of fungi 34 are arranged in a shape like a pyramid, and are alternately arranged up and down, so that the grains 1 introduced through the upper hopper 10 are evenly distributed while passing through the fungi 34. It can be seen that it is configured to flow into the grain passing chamber (31).

The vertical stirrer 40 has a vertical rotating shaft 41 configured to rotate by inserting a lower portion vertically into the grain passage chamber 31 as shown, a stirring blade 42 provided on an outer circumferential surface of the vertical rotating shaft 41, and It consists of a rotating device 43 for rotating the vertical rotation shaft 41.

That is, while stirring the grain (1) introduced into the grain passing chamber (31) is configured to be able to move smoothly to the lower portion without stagnant.

An example of the rotary device 43 may be configured by connecting a motor to each vertical rotation shaft 41, but as shown in the upper portion of each vertical rotation shaft 41 inserted into the grain passage chamber 31. A belt 43b or a chain connected thereto; It is preferable that the rotating motor 43a is connected to the belt 43b or the chain and rotates. The rotating motor 43a is configured to operate by rotating the entire vertical rotational shaft 41 with one rotation motor 43a.

Lower hopper 50 is installed in the lower portion of the main body 30 as shown is configured to enter the grain (1) falling through the grain passing chamber 31, the discharge port 51 is formed in the lower It is configured to move to the subsequent process through the outlet 51.

The horizontal stirrer 60 rotates the horizontal rotating shaft 62 which is horizontally installed inside the lower hopper 50 and the auxiliary stirrer blade and the horizontal rotating shaft 62 installed on the outer circumferential surface of the horizontal hopper 62 as shown. Consisting of the auxiliary rotary device (63) to stir the grain (1) introduced into the lower hopper 50 while the grain (1) is smoothly moved to the outlet 51 of the lower side without stagnation in the lower hopper 50 It is configured to be.

At this time, as shown, a plurality of horizontal rotating shaft 62 is installed in the lower hopper 50, the auxiliary rotating device 63 is a belt 61 or a chain and a belt (61) connecting the respective horizontal rotating shaft 62 ( 61) or a motor connected to the chain is preferable.

Discharge controller 70 is installed in the outlet 51 of the lower hopper 50 as shown, is configured to adjust the amount of grain (1) discharged through the lower hopper (50).

Discharge controller 70 for this may be configured by a known stirring blade or spring or screw rotated by a motor, it is possible to adjust the discharge of grain according to the number of revolutions of the motor.

In this case, the grain 1 discharged through the lower hopper 50 is circulated to the bucket elevator 80 to undergo a redrying process, and is discharged when the drying of the grain 1 is completed.

The motor installed in the discharge controller 70 is configured to rotate in both directions instead of simply operating or adjusting the rotational speed, and when rotating to one side, transfers the grain 1 to the bucket elevator 80 side, and the other. When rotating to the side may be configured to discharge to the next process.

Moisture meter 90 is installed on one side of the lower hopper 50 is configured to measure the moisture content of the grain (1).

When the grain (1) reaches the moisture content of the drying target, the discharge controller 70 or the damper (not shown) is linked to stop the circular drying of the grain (1) and is configured to discharge the grain (1) to the outside .

Bucket elevator 80 is one side is connected to the outlet 51 of the lower hopper 50, the other side is connected to the upper hopper 10.

That is, it serves to transfer the grain (1) discharged to the outlet 51 of the lower hopper 50 back to the upper hopper 10, and applies a generally known configuration.

Grain 1 introduced to the initial body 30 may be introduced through the upper hopper 10 from the outside by a conveyor (not shown), in addition to the grain inlet not shown installed on the lower side of the bucket elevator 80 Can be put through.

Air supply pipe 100 is connected to the air supply chamber 32 of the main body 30, the fan 101 is installed on one side.

The air discharge pipe 110 is connected to the plurality of air discharge chambers 33 of the main body 30.

In the figure, a state in which the air supply pipe 100 and the air discharge pipe 110 are connected to the main body 30 is shown, and each pipe is connected to the air supply chamber 32 and the air discharge chamber 33, respectively. Although not shown is because it can be connected to the duct in a variety of known ways will be omitted for the description of the connection method.

The fan 101 should have an air pressure and a flow amount such that dry air can evenly pass through the grain passage chamber 31 filled with the grain (1).

As shown in FIG. 4, the heat exchanger 120 is connected to an air supply pipe 100, and the other side of the heat exchanger 120 is connected to the air discharge pipe 110.

As shown in the heat exchanger 120, an air filter 121 is provided on the outside air and the ventilation side, an air supply fan 123 is provided on the air supply side, and an exhaust fan 122 is provided on the exhaust side, respectively. The air supply side is connected to the air supply pipe 100, the ventilation side is connected to the air discharge pipe 110 is configured to exchange heat between the ventilation and the outside air.

When one heat exchanger 120 is installed and used in one main body 30, the air supply fan 123 on the side of the heat exchanger 120 may be omitted, and only the fan 101 may be operated.

The outside air, that is, the air supply, which receives heat from the ventilation, is supplied to the air supply chamber 32 by controlling a temperature in a heating apparatus not shown in the main body 30.

On the other hand, as shown in the above configuration, the air supply pipe 100 and the air discharge pipe 110 is connected by the circulation connection pipe 130, the air supply pipe 100 and the air discharge pipe 110 and the circulation connection The pipe 130 may be configured to allow selective operation by configuring each damper is installed.

Specifically, when the humidity sensor is installed inside the air discharge pipe 110 to stop the circulation of the dry air when the humidity is above a predetermined value, the damper 140a and the damper 140c are opened and the damper 140b is closed to close the air supply pipe ( 100) and the air discharge pipe 110 is opened, dry air is discharged through the heat exchanger 120, and outside air having a low humidity and temperature passes through the heat exchanger 120 to recover heat and supply air. During the heat recovery operation, the damper 140a and the damper 140c are closed and the damper 140b is opened to allow the dry air to circulate while operating.

In some cases, the damper 140a, 140b, 140c may be controlled while opening and closing the heat recovery ventilation operation and the circulation operation in parallel.

In addition, when a plurality of main bodies 30 are connected to one heat exchanger 120, the main body 30 having a high humidity may be preferentially arranged to recover the heat according to the humidity inside each main body 30. have.

On the other hand, the grains 1 are evenly dispersed by the fungus 34 while falling through the foreign matter, such as the outer shell while the foreign material introduced through the upper hopper 10 and the foreign matter separation device 20 is removed. It is introduced into the grain passing chamber 31, and smoothly descends inside the grain passing chamber 31 by the vertical stirrer 40, and in this process, the porous plate or the metal mesh formed on the grain passing chamber 31 wall surface. One side is in communication with the air supply chamber 32 through which the air is supplied to dry the grain (1), while the other side is in communication with the air discharge chamber 33, the air is discharged to the outside grain (1) ) Becomes dry.

In addition, while the grains 1 passed through each grain passing chamber 31 are stirred by the horizontal stirrer 60 while flowing into the lower hopper 50, the grains 1 do not stagnate within the lower hopper 50 and the moisture content measuring instrument 90 is provided. Depending on the state of the grain (1) measured in the discharged to the subsequent process according to the operation of the discharge controller 70 or the operation of the electric damper (not shown), or the bucket elevator 80 to move to the upper hopper 10 to re- It will dry out.

On the other hand, inside the grain passing chamber 31, the amount of passage control means 31a which can be rotated or opened and closed on the wall of the grain passing chamber 31 in order to adjust the rate of falling of the grain introduced into the grain passing chamber 31. It is preferable that this is provided.

Although not shown in order to operate as described above circulating grain dryer of the array recovery method of the present invention configured as described above, the control device is installed, the control device is a foreign material separation device 20, vertical stirrer 40 And dampers 140a, 140b, 140c installed in the horizontal stirrer 60, the discharge controller 70, the bucket elevator 80, the moisture content meter 90 and the humidity sensor and the air supply pipe 100 and the air discharge pipe 110 and It may be configured to be electrically connected to control the operation of each device.

1: grain 10: upper hopper
11: foreign material suction outlet 12: blower fan
20: foreign matter separation device
30: main body 31: grain passing chamber
31a: passage amount adjusting means 32: air supply chamber
33: air discharge chamber 34: fungus branch
35: hollow part
40: vertical stirrer 41: vertical axis of rotation
42: stirring blade 43: rotating device
43a: rotary motor 43b: belt
50: lower hopper 51: outlet
60: horizontal stirrer 61: belt
62: horizontal rotating shaft 63: auxiliary rotating device
70: discharge controller 80: bucket elevator
90: moisture content meter 100: air supply pipe
101: fan 110: air discharge pipe
120: heat exchanger 121: air filter
122: exhaust fan 123: air supply fan
130: circulation connector 140a, 140b, 140c: damper

Claims (4)

In grain dryer,
An upper hopper 10 configured to discharge the grain 1 to be dried to the upper side and to discharge the grain 1 introduced to the lower side, the foreign material suction discharge outlet 11 formed on one wall;
The foreign matter contained in the grain (1) passing through the upper hopper 10 by blowing air to the foreign matter suction outlet 11 is connected to one side of the upper hopper 10 is sucked to the foreign matter suction outlet 11 A foreign matter separation device 20 to be discharged;
It is connected to the upper hopper 10 is configured so that the grain (1) is introduced into the inside, a plurality of grain passing chamber 31 is formed inside the top and bottom, the grain passing chamber 31 One side of the air supply chamber 32 is supplied with air is formed, the other side of the grain passage chamber 31 is formed with an air discharge chamber 33 through which the air is discharged, the wall surface of the grain passage chamber 31 There are a plurality of holes are formed to be discharged through the air discharge chamber 33 after the air is introduced from the air supply chamber 32, the grain passage chamber 31, the air supply chamber 32 and air A main body 30 having a grain storage chamber, which is a hollow part 35, formed on the discharge chamber 33;
It is installed on the main body 30, the fungus (34) configured to evenly distribute and drop the grain (1) introduced into the main body 30;
A lower hopper 50 installed at a lower portion of the main body 30 and having a grain 1 falling through the grain passing chamber 31 and having an outlet 51 formed therein;
A discharge controller (70) installed at the lower hopper (50) outlet (51) and configured to adjust the amount of grain (1) discharged through the lower hopper (50);
A moisture content meter (90) installed at one side of the lower hopper (50) to measure the moisture content of the grain (1);
One side is connected to the outlet 51 of the lower hopper 50, the other side is connected to the upper hopper 10 to supply the grain (1) discharged from the lower hopper 50 to the upper hopper 10 A bucket elevator 80 configured to;
An air supply pipe 100 connected to the air supply chamber 32 of the main body 30 and having a fan 101 installed at one side thereof;
An air discharge pipe 110 connected to the air discharge chamber 33 of the main body 30;
A circulation connection pipe 130 connecting the air supply pipe 100 and the air discharge pipe 110;
Dampers (140a, 140b, 140c) installed in the air supply pipe (100), the air discharge pipe (110), and the circulation connection pipe (130), respectively;
One side is connected to the air supply pipe 100, the other side is a heat exchanger 120 is connected to the air discharge pipe 110; characterized in that comprises a,
Circulatory grain dryer
The method of claim 1,
Rotation to rotate the vertical rotation shaft 41 and the stirring blade 42 provided on the outer circumferential surface of the vertical rotation shaft 41, the lower portion is vertically inserted into the grain passing chamber 31 to rotate vertically A vertical stirrer 40 composed of the apparatus 43 and configured to stir the grains 1 introduced into the respective grain passing chambers 31;
The rotating device 43 includes a belt 43b or a chain connected to an upper portion of each vertical rotating shaft 41 inserted into the grain passing chamber 31; Characterized in that consisting of; a rotating motor (43a) is connected to the belt 43b or a chain and rotates
Circulatory grain dryer
The method of claim 1,
It consists of a horizontal rotating shaft 62 is installed horizontally in the lower hopper 50, and the auxiliary rotating device 63 for rotating the auxiliary stirring blade and the horizontal rotating shaft 62 provided on the outer peripheral surface of the horizontal rotating shaft 62. Characterized in that a plurality of horizontal stirrer 60 is configured to stir the grain (1) introduced into the lower hopper 50;
Circulatory grain dryer
The method of claim 1,
In the grain passage chamber 31, characterized in that the passage amount adjusting means 31a is installed on the wall of the grain passage chamber 31 to adjust the passage speed of the grains introduced into the grain passage chamber 31,
Circulatory grain dryer

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