JPH06245641A - Method for preventing occurrence of dew condensation in grain preservation and its apparatus - Google Patents

Abstract

PURPOSE:To preserve dried grain at a low temperature over a long period without deteriorating quality or lowering taste by removing dew condensation which occurs by the difference of temperature between the temperature of piled dried grain and the temperature of the outer wall face by only circulating and communicating air in a storage container. CONSTITUTION:An air blow passage 8 for connecting the upper space 5 to the lower space 7 is set on a storage container 1 in which dried grain for low- temperature preservation is housed. A humidity sensor 12 for detecting humidity of the upper part of a deposited dry grain layer A raised by the difference of temperature between the temperature of deposited dry grains and the temperature of the outer wall face 11 is arranged at a position of the upper part of the deposited dry grain layer A, close to the outer wall face 11 of the storage tank 1 and simultaneously an air blower 10 for circulating and communicating air in the interior of the storage container 1 through a blowing passage 8 is installed in the air blow passage 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reliably eliminates dew condensation caused by a temperature difference between the accumulated dry grain temperature and the outer wall surface temperature of the storage container when the dry grain is stored in a storage container at a low temperature. The present invention relates to a dew condensation preventing method and apparatus in grain storage, which can prevent deterioration of quality and can be stored at a low temperature under a good taste condition.

[0002]

2. Description of the Related Art Conventionally, grain storage, particularly dry loose grain, has been stored in silos in country elevators, and in other cases, it has been stored using large tanks or storage containers. When storing dried grains, it is necessary to keep the grain temperature at 20 ° C or lower for the purpose of preventing deterioration of the quality of the stored dried grains. Some of them are stored at lower temperatures such as 5 ° C or 10 ° C. There are some places. In any case, deterioration of rice quality (increase in fatty acids) occurs when left for a long time at a grain temperature of 20 ° C or higher,
It is important to maintain the grain temperature of the dried and dried grain at an appropriate storage temperature because the taste will be reduced, and if the grain temperature rises, a troublesome operation is required to reduce the grain temperature. It is generally well known prior to the present application that rotation such as silo replacement needs to be performed.

[0003]

By the way, when the dry grain is stored at a low temperature using the silo or the storage container as described above, the canopy or wall surface in the storage container is greatly affected by the outside air temperature during storage. Condensation occurs due to the temperature difference and wets the grain in contact with the surface and wall of the accumulated dry grain, and as a result,
Accumulation of quality of stored dry grains may be deteriorated and taste may be deteriorated.

In the silo and storage container, even if the outer wall of the silo is insulated, the dry grain near the outer wall is affected by the outside air temperature, and the range of the influence is 10c from the outer wall.
It is said that when the outside air temperature is lower than the inside dry grain temperature, the conditions for the occurrence of dew condensation will be adjusted. As the dew condensation phenomenon is seen everywhere, when the gas is cooled, the relative humidity gradually increases even if the water vapor contained in the gas does not change, and finally the relative humidity becomes 100% and saturated at a certain temperature. The temperature at this time is the dew point, and if the temperature drops even lower than this, part of the water vapor will liquefy and condense on the nearby solid surface to form dew, and if the amount of dew condensation falls below the dew point temperature. The higher the relative humidity of the gas, the more it decreases.

Therefore, when dry grains are stored at low temperature using a storage container, there is a problem that it is important to prevent the occurrence of dew condensation and to prevent quality deterioration and deterioration of taste. .

The present invention provides a method for cold-drying dry grains.
Due to the temperature difference between the accumulated dry grain temperature and the outer wall surface temperature, when the humidity of the upper part of the accumulated dry grain layer near the outer wall rises to the atmosphere where condensation occurs, the air inside the storage container is circulated to blow the accumulated dried grain layer. An object of the present invention is to provide a method and an apparatus for preventing the occurrence of dew condensation in grain storage, which can prevent the occurrence of dew condensation by eliminating the low temperature part.

[0007]

In order to achieve the above object, in the method for preventing the occurrence of dew condensation in grain storage of the present invention, when the dry grain stored in the storage container is stored at a low temperature, the accumulated dry grain temperature and storage Due to the temperature difference between the temperature of the outer wall surface of the container and the humidity of the upper part of the accumulated dry grain layer near the outer wall surface increases to the atmospheric humidity of the condensation, the air inside the storage container is circulated to generate the accumulated dry grain layer in contact with the outer wall surface. It eliminates the partially low temperature part.

In the dew condensation preventing apparatus for storing grain of the present invention, a storage container containing dry grains for low temperature storage is provided with an air passage connecting the upper space and the lower space, and the upper portion of the accumulated dried grain layer is provided. In addition, in the storage container near the outer wall surface, a humidity sensor for detecting the humidity of the upper part of the accumulated dry grain layer that rises due to the temperature difference between the accumulated dry grain temperature and the storage container outer wall surface temperature is provided. An air blower for circulating the air inside the storage container through the air blow passage is provided in the air blow passage.

[0009]

In FIG. 1, dry grains are accommodated in a storage container through an expansion device between the upper space and the lower space in a piled state, and then a cooling device provided in the air passage is operated. ,
The generated cool air is circulated and circulated in the accumulated dried grain layer to be cooled to a predetermined appropriate storage temperature, for example, 20 ° C. or lower and stored.

By the way, during the low temperature storage as described above, the outside air temperature is lower than the internal temperature (grain temperature) of the storage container by, for example, 10 ° C., and due to the temperature difference, the humidity of the upper portion of the accumulated dry grain near the outer wall is gradually increased. When the humidity sensor installed at the upper part of the accumulated dry grain layer and close to the outer wall surface detects that the humidity becomes 90% to 95%, for example, the humidity of the atmosphere in which dew condensation is generated is detected. The air blower installed automatically starts operation, and the air inside the storage container is circulated and circulated through the air blow passage, and the low temperature part that partially occurs in the accumulated dry grain layer in contact with the outer wall surface is quickly eliminated.

As a result, since the humidity of the upper layer of the accumulated dry grain near the outer wall is gradually lowered, the occurrence of dew condensation is prevented in advance, and the low temperature is maintained for a long time without deteriorating the quality of the dry grain or the taste. Can be stored.

[0012]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a vertical sectional front view of a dew condensation preventing apparatus in grain storage for carrying out the grain storage method of the present invention.
Is a vertical storage container having a circular, square, rectangular, polygonal, or any other cross-sectional shape in cross section, and for carrying dry grains into the storage container 1 in the central upper part of the storage container 1. Is installed. The tension device 2 is connected to the upper side of an elevator 3 standing upright on one side of the storage container 1 via a transfer gutter 4. An upper space 5 is laid at an upper position inside the storage container 1, a porous floor plate 6 is laid at a lower position to provide a lower space 7, and the upper space 5 and the lower space 7 form a ventilation path 8. Connected through. Reference numeral 9 is a cooling device installed in the air passage 8.
Is an air blower arranged in the air blow passage 8 to circulate and circulate the air inside the storage container 1 either downward or upward through the air blow passage 8. 12
Is a humidity sensor arranged above the accumulated dry grain layer A and near the outer wall surface 11. The humidity sensor 12 detects the humidity of the upper portion of the accumulated dry grain layer A near the outer wall surface 11. .

FIG. 2 is a block circuit diagram for carrying out the method of the present invention, in which 12 is a humidity sensor, 13 is a humidity detecting circuit, 14 is a dew condensation occurrence judging circuit, and 15 is a dew condensation occurrence judging circuit. , A humidity setting circuit, 16 is a blower control circuit, and 10 is a blower, and the humidity sensor 12 detects the humidity of the upper part of the accumulated dry grain layer A near the outer wall surface 11 of the storage container 1 during low temperature storage. , And sends the detection signal to the humidity detection circuit 13. Then, when the humidity sensor 12 detects a preset dew condensation generation atmosphere humidity (for example, 90 to 95%) sent from the humidity setting circuit 15, the dew condensation occurrence determination circuit 14 determines that dew condensation has occurred, and the air blower device. The air blower 10 is operated by the control circuit 16 to circulate and circulate the air inside the storage container 1 through the air blow passage 8 to promptly eliminate a partial low temperature portion generated in the accumulated dried grain layer A in contact with the outer wall surface 11. This prevents the occurrence of dew condensation.

[0014]

Since the present invention has the method and apparatus as described above, it has the following effects. When the dry grain is stored at a low temperature, if the temperature difference between the temperature of the accumulated dry grain and the temperature of the outer wall surface of the storage container causes the humidity above the accumulated dry grain layer near the outer wall surface to rise to the humidity of the atmosphere in which condensation occurs, the humidity sensor measures the humidity. Promptly detect and activate the air blower to circulate and circulate the air inside the storage container through the air flow path to eliminate the low temperature part of the accumulated dry grain layer in contact with the outer wall surface, and to prevent dew condensation. Therefore, it is possible to store dry grains at low temperature in good condition for a long time without deteriorating quality and taste, or there is no need to perform rotation as in the conventional method. It is possible to provide a storage device that is simple and inexpensive.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a dew condensation preventing apparatus for storing grains for carrying out the method of the present invention.

FIG. 2 is a block circuit diagram for carrying out the method of the present invention.

[Explanation of symbols]

 1 Storage Container 5 Upper Space 7 Lower Space 8 Air Duct 10 Air Blower 11 Outer Wall 12 Humidity Sensor 13 Humidity Detection Circuit 14 Condensation Occurrence Judgment Circuit 15 Humidity Setting Circuit 16 Air Blower Control Circuit A Deposited Dry Grain Layer

Claims (2)

[Claims] 1. When the dry grain stored in the storage container is stored at a low temperature, the temperature difference between the accumulated dry grain temperature and the outer wall surface temperature of the storage container causes dew condensation on the upper part of the dried dry grain layer near the outer wall surface. A method for preventing the formation of dew condensation in grain storage, characterized in that, when the atmospheric humidity rises, the air inside the storage container is circulated to eliminate the low temperature part that has partially occurred in the accumulated dry grain layer in contact with the outer wall surface. 2. A storage container containing dry grains for low-temperature storage is provided with an air passage connecting an upper space and a lower space, and the storage container at a position above the accumulated dry grain layer and close to the outer wall surface. , A humidity sensor that detects the humidity of the upper part of the accumulated dry grain layer that rises due to the temperature difference between the accumulated dry grain temperature and the outer wall surface temperature of the storage container is installed, and the air inside the storage container is installed in the air passage. A device for preventing the formation of dew condensation in grain storage, characterized in that an air blower for circulating circulation is provided.