CN117651491A - Agricultural product drying system adopting hot air drying mode based on temperature and humidity control - Google Patents

Agricultural product drying system adopting hot air drying mode based on temperature and humidity control Download PDF

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Publication number
CN117651491A
CN117651491A CN202280043697.3A CN202280043697A CN117651491A CN 117651491 A CN117651491 A CN 117651491A CN 202280043697 A CN202280043697 A CN 202280043697A CN 117651491 A CN117651491 A CN 117651491A
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CN
China
Prior art keywords
drying
temperature
drying chamber
humidity
control
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CN202280043697.3A
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Chinese (zh)
Inventor
朴钟午
朴基先
郑载玟
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Ces Ltd
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Ces Ltd
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Publication of CN117651491A publication Critical patent/CN117651491A/en
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/02—Dehydrating; Subsequent reconstitution
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B9/00—Preservation of edible seeds, e.g. cereals
    • A23B9/08—Drying; Subsequent reconstitution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/14—Chambers, containers, receptacles of simple construction
    • F26B25/18—Chambers, containers, receptacles of simple construction mainly open, e.g. dish, tray, pan, rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Microbiology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention discloses an agricultural product drying system for repeatedly performing hot air drying and air suction and exhaust in a drying chamber in a staged manner to adjust the temperature and the humidity in the drying chamber to the optimal conditions required by agricultural product drying, which comprises a drying chamber (100), a drying material rack (200), an air suction and exhaust subsystem (300), a hot air subsystem (400), a temperature and humidity measurement subsystem (500) and a control device (600).

Description

Agricultural product drying system adopting hot air drying mode based on temperature and humidity control
Technical Field
The present invention relates to an agricultural product drying system of a hot air drying system based on temperature and humidity control, which repeatedly performs hot air drying and air suction and exhaust in a drying chamber in stages to adjust the temperature and humidity in the drying chamber to an optimum condition required for drying agricultural products, so that the agricultural product drying time is shortened as compared with the time of natural drying, and the agricultural product drying state is set to an optimum drying state.
Background
Modern society starts to change in many industrial fields including agricultural fields with the development of scientific technology, and recent trend of the agricultural field is to shift from a low-variety mass production mode to a multi-variety low-volume production mode for the purpose of health and well-being (well-being).
Farmers usually cultivate various agricultural products such as grains, fruits and vegetables, and recently, cultivation methods such as soilless cultivation and intelligent farms, which are applicable to sophisticated agricultural technologies, are introduced for cultivating high-value-added agricultural products.
On the other hand, agricultural products produced by farmers are dried for storage and distribution, and agricultural products are dried to a moisture content of not more than a certain ratio, and agricultural products containing moisture content of not less than a certain ratio are spoiled by bacteria and mold growth and the like, which cause problems during storage and distribution for a long time, and when powdered processing is performed, moisture content of not less than a certain ratio hinders powdered processing.
The drying treatment method of agricultural products is mainly divided into a natural drying method using sunlight and natural wind and a manual drying method provided with drying facilities and creating a drying environment at the drying facilities.
The natural drying method does not require special facilities or costs when drying agricultural products, but is affected by weather and seasons and has a long drying time, whereas the artificial drying method can dry agricultural products in a large amount in a short time without being affected by weather and seasons.
In particular, the hot air drying method among the manual drying methods is to manually generate hot air to raise the temperature inside the drying chamber to a high temperature to remove moisture from agricultural products.
However, in the conventional hot air drying method, the agricultural product cannot be dried to a final target agricultural product dried state (state in which moisture contained in the agricultural product is not more than a certain ratio) regardless of humidity.
In any case, the temperature inside the drying chamber is increased, and as long as the moisture content in the interior of the agricultural product is higher than or equal to the humidity inside the drying chamber, the moisture in the interior of the agricultural product cannot be further discharged, and drying cannot be performed. This is a result of the fact that the conventional hot air drying method only considers the temperature and not the humidity when drying the agricultural products.
Accordingly, in order to solve the above-described problems, the present invention provides an agricultural product drying system in which, at the time of drying agricultural products, the temperature and humidity in the drying chamber are adjusted to the optimum conditions for drying the agricultural products by repeatedly performing the hot air drying and the air suction and exhaust in stages in the drying chamber, so that the agricultural product drying time is shortened as compared with the natural drying, and the agricultural product drying state is set to the optimum drying state (the state in which the moisture content of the agricultural products is set to a certain ratio or less). The prior art related to this is as follows.
Prior art literature
1. Korean patent publication No. 10-1601885 "structure of agricultural product drying room"
2. Korean patent publication No. 10-1878643, "photo-thermal drying apparatus and drying method using the same"
3. All-weather multipurpose dryer of Korean patent publication No. 10-1872680 "
Disclosure of Invention
The present invention aims to repeatedly perform hot air drying and air suction and exhaust in a drying chamber in stages during agricultural product drying, and adjust the temperature and humidity in the drying chamber to optimal conditions required for agricultural product drying.
In order to achieve the above object, a hot air drying system according to the present invention includes:
a drying chamber 100 having an inner space of a certain size;
a drying rack 200 disposed inside the drying chamber 100 and configured to load agricultural products 20 to be dried;
an air suction and exhaust subsystem 300 for allowing external air to flow into the drying chamber 100 or discharging the air inside the drying chamber to the outside;
a hot air subsystem 400 for heating and circulating air inside the drying chamber so as to dry the agricultural products 20 to be dried loaded on the drying rack 200;
a temperature and humidity measurement subsystem 500 for measuring the temperature and humidity inside and outside the drying chamber 100 and providing the measured temperature and humidity information to the control device 600;
After performing the first-stage drying control for controlling the suction/exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the first-stage drying state, the control device 600 performs the second-stage drying control for controlling the suction/exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the final drying state.
The present invention repeatedly performs the hot air drying and the air suction and exhaust to the inside of the drying chamber in stages during the drying of the agricultural products, and adjusts the temperature and the humidity in the drying chamber to the optimum conditions for the drying of the agricultural products, so that the drying time of the agricultural products is shortened compared with the natural drying, and the agricultural products are in the optimum drying state (the state that the moisture content of the agricultural products is less than a certain ratio).
Drawings
Fig. 1 is a conceptual diagram of the present invention.
Fig. 2 is a block diagram of the present invention.
FIG. 3 is a detailed configuration view of a drying rack according to the present invention.
FIG. 4 is a diagram illustrating the movement of the drying rack according to the present invention.
Fig. 5 is a detailed configuration diagram of the present invention.
Fig. 6 is a first stage pre-drying control state diagram of the present invention.
Fig. 7 is a first stage post-drying control state diagram of the present invention.
Fig. 8 is a state diagram of the second stage pre-drying control according to the present invention.
Fig. 9 is a state diagram of the second stage post-drying control of the present invention.
FIG. 10 is a functional illustration of the present invention and a platform management server.
Description of the reference numerals
10: agricultural product drying system adopting hot air drying mode based on temperature and humidity control
20: agricultural products
30: platform management server
100: drying chamber
200: drying rack
300: suction and exhaust subsystem
400: hot air subsystem
500: temperature and humidity measurement subsystem
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In the agricultural product drying system 10 of the hot air drying system based on the temperature and humidity control of the present invention (hereinafter referred to as the "present invention"), the temperature and humidity in the drying chamber are adjusted to the optimum conditions for drying the agricultural product by repeatedly performing the hot air drying and the air suction and exhaust in stages in the drying of the agricultural product, so that the agricultural product drying time is shortened as compared with the natural drying, and the agricultural product to be dried is in the optimum drying state.
Referring to fig. 1 and 2, the present invention 10 includes a drying chamber 100, a drying rack 200, an air intake and exhaust subsystem 300, a hot air subsystem 400, a temperature and humidity measurement subsystem 500, and a control device 600.
Specifically, the agricultural product drying system of the invention based on the hot air drying mode of temperature and humidity control comprises:
a drying chamber 100 having an inner space of a certain size;
a drying rack 200 disposed inside the drying chamber 100 and configured to load agricultural products 20 to be dried;
an air suction and exhaust subsystem 300 for allowing external air to flow into the drying chamber 100 or discharging the air inside the drying chamber to the outside;
a hot air subsystem 400 for drying the agricultural products 20 to be dried loaded on the drying rack 200;
a temperature and humidity measurement subsystem 500 for measuring the temperature and humidity inside and outside the drying chamber 100 and providing the measured temperature and humidity information to the control device 600;
after performing the first-stage drying control for controlling the suction/exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the first-stage drying state, the control device 600 performs the second-stage drying control for controlling the suction/exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the final drying state.
The drying chamber 100 is an element having a certain size of an inner space, in which the agricultural product 20 to be dried is disposed for drying and provides an installation space for equipment for creating a drying environment.
The drying chamber 100 may be formed as a movable structure such as a container or a fixed building structure. A farmer with extra land can use a movable structure such as a container as the drying chamber 100, and a farmer with an empty building can use an empty building as the drying chamber 100.
The drying rack 200 is an element disposed inside the drying chamber 100 and used for loading the agricultural products 20 to be dried.
As shown in fig. 5, the plurality of drying racks 200 are disposed in the drying chamber, and have a laminated structure in which a drying frame 210 on which agricultural products to be dried are mounted is inserted in a laminated structure as shown in fig. 4, and are fixedly disposed at the bottom of the drying chamber 100 or are moved inside the drying chamber 100 for drying the agricultural products.
The drying rack 200 is an element for loading the agricultural product 20 to be dried in order to dry the agricultural product, and a plurality of drying racks 200 are provided so that at least one or more of them is arranged inside the drying chamber 100, and the drying frame 210 on which the agricultural product is loaded is inserted in a layered structure.
The drying rack 200 is fixedly disposed at the bottom inside the drying chamber 100 or is moved inside the drying chamber 100 for drying agricultural products.
In particular, if the temperature and humidity distribution in the drying chamber 100 is not uniform, there is a possibility that the drying state of the agricultural product 20 to be dried loaded on the drying rack 200 may not be uniform depending on the drying position of each drying rack due to the non-uniform temperature and humidity distribution in the drying chamber 100. To prevent this problem, the drying rack 200 is moved inside the drying chamber 100.
The moving means may include a means for moving the drying rack 200 at the bottom of the inside of the drying chamber 100, and a means for moving the drying rack 200 in the air of the inside of the drying chamber 100.
In order to allow the drying rack 200 to move inside the drying chamber 100, the present invention may also be provided with a rack movement subsystem 220.
Specifically, as shown in fig. 3 and 4, the rack moving subsystem 220 includes:
a moving rail 221 guiding movement of the drying rack 200;
a moving carriage 222 is detachably coupled to the drying rack 200 and is mounted on the moving rail 221 so as to move the drying rack 200 on the moving rail 221.
Therefore, as shown in fig. 3, when the plurality of drying racks 200 are moved inside the drying chamber 100 by the rack moving subsystem 220 in order to change the drying position, even if uneven temperature and humidity distribution occurs inside the drying chamber 100, the drying of the agricultural product 20 to be dried with uniform quality can be realized.
The rack moving subsystem 220 is installed at the inner bottom of the drying chamber 100 if the drying rack 200 is moved at the inner bottom of the drying chamber 100, and the rack moving subsystem 220 is installed at the ceiling of the drying chamber 100 if the drying rack 200 is moved in the air inside the drying chamber 100. Fig. 4 illustrates an example in which the rack moving subsystem 220 is installed at the ceiling of the drying chamber 100.
The suction and exhaust subsystem 300 is an element for allowing external air to flow into the inside of the drying chamber 100 or discharging the air inside the drying chamber to the outside.
In the drying, the reason why the air is ventilated by flowing the outside air into the drying chamber 100 or discharging the inside air to the outside is to adjust the humidity inside the drying chamber 100.
However, if the temperature inside the drying chamber is increased, the moisture content in the agricultural product to be dried cannot be discharged further, and drying cannot be performed, as long as the humidity inside the drying chamber is higher than or equal to the moisture content in the agricultural product to be dried. This is a problem of the conventional hot air drying method in which only the temperature is considered when drying agricultural products.
In order to create an optimal drying environment, the present invention repeatedly performs a process of ventilating (ventilating) air inside the drying chamber to reduce the humidity inside the drying chamber when the humidity inside the drying chamber is increased by the moisture discharged from the agricultural product after the moisture is discharged from the agricultural product at a high temperature is formed inside the drying chamber, and for this purpose, an air suction and exhaust subsystem 300 is provided, the operation of which is controlled by the control device 600.
Specifically, as shown in fig. 5, the suction and exhaust subsystem 300 includes:
a plurality of suction fans 310 installed at the side of the drying chamber 100 to allow external air to flow into the drying chamber 100;
a plurality of exhaust fans 320 installed at the ceiling of the drying chamber 100 so as to exhaust the air inside the drying chamber to the outside;
the plurality of suction fans 310 are operated according to the control of the control device 600 so as to adjust the suction amount of the external air flowing into the inside of the drying chamber 100,
the plurality of exhaust fans 320 operate according to the control of the control device 600 so as to adjust the amount of exhaust of the internal air discharged to the outside of the drying chamber 100.
The plurality of suction fans 310 are elements installed at the side of the drying chamber 100 to allow the external air to flow into the drying chamber 100, and the plurality of suction fans 310 are operated according to the control of the control device 600 to adjust the suction amount of the external air flowing into the drying chamber 100. For example, normal operation or operation at 10%, 30% of normal operating speed.
Further, the plurality of exhaust fans 320 are elements installed at the ceiling of the drying chamber 100 so as to discharge the air inside the drying chamber to the outside, and the plurality of exhaust fans 320 operate according to the control of the control device 600 so as to adjust the amount of exhaust of the inside air discharged to the outside of the drying chamber 100. For example, normal operation or operation at 10%, 30% of normal operating speed.
At this time, the suction operation of the plurality of suction fans 310 and the exhaust operation of the exhaust fan 320 are controlled by the control device 600 under various operation conditions (for example, normal operation, operation at 10% of the normal operation speed, operation at 30% of the normal operation speed, etc.), and if the internal humidity of the drying chamber 100 becomes high, which hinders the drying of agricultural products, the plurality of suction fans 310 and the exhaust fan 320 are operated under the control of the control device 600 to ventilate the air inside the drying chamber 100 so as to reduce the internal humidity of the drying chamber 100.
The hot air subsystem 400 is an element for heating and circulating air inside the drying chamber so as to dry the agricultural products 20 to be dried loaded on the drying rack 200.
The hot air subsystem 400 heats and circulates the air inside the drying chamber according to the control of the control device 600 so as to generate circulated hot air such that the temperature inside the drying chamber 100 becomes a target temperature suitable for drying.
Specifically, as shown in fig. 5, the hot air subsystem 400 includes:
a mounting plate 410 formed in an area smaller than that of the ceiling of the drying chamber 100, and mounted at a distance from the ceiling of the drying chamber 100;
a carbon fiber heating cable 420 installed at an upper portion of the installation plate 410 to heat the air inside the drying chamber 100, and controlled in heating temperature according to the control of the control device 600;
A blower fan 430 installed at an upper portion of the installation plate 410 for circulating air inside the drying chamber 100;
a plurality of hot air branching plates 440 installed in a lower space of the installation plate 410 so as to branch the air heated by the carbon fiber heating cables 420 toward an inner space of the drying chamber 100 in a lower part of the installation plate 410;
a refrigerant circulation device 450 operated according to the control of the control device 600 so as to allow moisture contained in the air inside the drying chamber 100 to be adsorbed;
the refrigerant circulation device 450 includes a refrigerant circulation pipe 451 installed at one side inside the drying chamber 100.
As shown in fig. 5, the mounting plate 410 is formed in an area smaller than the area of the ceiling of the drying chamber 100, and is installed at a distance from the ceiling of the drying chamber 100.
The mounting plate 410 provides a mounting space for mounting the carbon fiber heating cable 420 and the blower fan 430 at the upper portion, and also functions to circulate hot air generated when the carbon fiber heating cable 420 and the blower fan 430 are operated inside the drying chamber.
That is, the drying chamber interior space is divided into an upper space of the mounting plate and a lower space of the mounting plate with respect to the mounting plate 410, and the circulation efficiency of the hot air generated when the carbon fiber heating cable 420 and the blower fan 430 are operated in the drying chamber is higher when the mounting plate 410 is provided than when the mounting plate 410 is not provided.
When the hot air circulation efficiency in the drying chamber is high, the effect of promoting the drying of agricultural products can be exerted accordingly.
The carbon fiber heating cable 420 is a component which is mounted on the upper portion of the mounting plate 410 as shown in fig. 5 in order to heat the air inside the drying chamber 100, and which controls the heat generation temperature thereof according to the control of the control device 600.
Here, the carbon fiber heating cable 420 generates heat when power is supplied thereto, thereby heating the air inside the drying chamber. In particular, the carbon fiber heating cable 420 variously adjusts the heat generation temperature according to the first-stage drying control and the second-stage drying control of the control device 600.
The blower fan 430 is a component mounted on the upper portion of the mounting plate 410 as shown in fig. 5 in order to circulate the heated air in the drying chamber 100.
The reason for circulating the heated air inside the drying chamber 100 is to obtain uniform quality of drying the agricultural products. The air heated by the heat generated by the carbon fiber heating cable 420 circulates uniformly inside the drying chamber 100 to make the drying quality of the agricultural products dried inside the drying chamber uniform. For this, the air blowing fan 430 is operated to induce circulation of heated air inside the drying chamber 100.
The plurality of hot air branching plates 440 are installed in a lower space of the installation plate 410 as shown in fig. 5 in order to branch the air heated by the carbon fiber heating cable 420 to the inner space of the drying chamber 100 at the lower part of the installation plate 410.
The heated air in the upper space of the installation plate 410 is dispersed to the lower space of the installation plate 410 after hitting the wall surface of the drying chamber side when the air blowing fan 430 is operated, and the plurality of hot air branching plates 440 perform a branching function such that the dispersed heated air hitting the wall surface of the drying chamber side is uniformly distributed to the lower space of the installation plate 410 where the agricultural products are dried.
The refrigerant circulation device 450 operates according to the control of the control device 600 so that moisture contained in the air inside the drying chamber 100 is adsorbed, and the refrigerant circulation device 450 includes a refrigerant circulation pipe 451 installed at one side inside the drying chamber 100 as shown in fig. 5.
The drying chamber interior air is ventilated during the drying process by the suction and exhaust subsystem 300. As described above, the reason why the air inside the drying chamber is ventilated is that when the humidity inside the drying chamber is increased by the moisture discharged from the agricultural product to be dried and the increased humidity inside the drying chamber prevents the drying of the agricultural product (when the humidity of the air inside the drying chamber is higher than the moisture content of the agricultural product and the moisture cannot be discharged from the agricultural product and further drying is not performed), the air inside the drying chamber is ventilated with the outside air to reduce the humidity inside the drying chamber.
However, there may be a case where the suction/exhaust subsystem 300 is not operated during the drying process (a case where the humidity outside the drying chamber is higher than the internal humidity when the first stage earlier drying control is performed, and a case where the second stage later drying control is performed), and in this case, the refrigerant circulation device 450 is operated to lower the humidity inside the drying chamber which is increased.
That is, when the refrigerant circulation device 450 is operated, the refrigerant flows through the refrigerant circulation pipe 451 attached to the inside of the drying chamber 100, and moisture contained in the heated drying chamber interior air is adsorbed and condensed on the surface of the cooled refrigerant circulation pipe 451, whereby the moisture contained in the drying chamber interior air is reduced, and the drying chamber interior humidity is lowered.
The temperature and humidity measurement subsystem 500 is a component for measuring the temperature and humidity inside and outside the drying chamber 100 and providing the measured temperature and humidity information to the control device 600.
Specifically, as shown in fig. 5, the temperature and humidity measurement subsystem 500 includes:
a first temperature sensor 510 measuring a temperature outside the drying chamber 100 and providing measured temperature information to the control device 600;
a second temperature sensor 520 measuring the temperature inside the drying chamber 100 and providing the measured temperature information to the control device 600;
A first humidity sensor 530 measuring humidity outside the drying chamber 100 and providing the measured humidity information to the control apparatus 600;
the second humidity sensor 540 measures the humidity inside the drying chamber 100 and provides the measured humidity information to the control apparatus 600.
The first temperature sensor 510 measures the temperature outside the drying chamber 100 and provides the measured temperature information to the control device 600, and the second temperature sensor 520 measures the temperature inside the drying chamber 100 and provides the measured temperature information to the control device 600.
The first humidity sensor 530 measures the humidity outside the drying chamber 100 and provides measured humidity information to the control apparatus 600, and the second humidity sensor 540 measures the humidity inside the drying chamber 100 and provides measured humidity information to the control apparatus 600.
Accordingly, the control device 600 described later controls the air intake and exhaust subsystem 300 and the hot air subsystem 400 under various conditions based on the temperature and humidity information of the inside and outside of the drying chamber 100 provided by the first temperature sensor 510, the second temperature sensor 520, the first humidity sensor 530, and the second humidity sensor 540, so that the inside environment of the drying chamber becomes the optimal environment for drying the agricultural product 20 to be dried.
The control device 600 performs the first-stage drying control for controlling the suction and exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the first-stage drying state, and then performs the second-stage drying control for controlling the suction and exhaust subsystem 300 and the hot air subsystem 400 by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 so as to bring the agricultural product 20 to be dried into the final drying state.
That is, control device 600 controls the temperature and humidity in the drying chamber to the optimal conditions required for drying the agricultural product by performing the heating and the air intake/exhaust (after performing the first stage drying control in which the first stage pre-drying control and the first stage post-drying control are repeatedly performed, and then performing the second stage drying control in which the second stage pre-drying control and the second stage post-drying control are repeatedly performed) in stages by air intake/exhaust subsystem 300 and hot air subsystem 400.
The first-stage drying control of the control device 600 will be specifically described.
The first-stage drying control of control device 600 is a control for bringing agricultural products 20 to be dried into a first-stage drying state (for example, bringing the moisture content of the agricultural products to be dried to a predetermined value (for example, 10 to 15%) or less), and repeatedly executes the first-stage early-stage drying control and the first-stage later-stage drying control.
Specifically, the first stage drying control of the control device 600 includes: a first stage of preliminary drying control in which the air inside the drying chamber is discharged to the outside of the drying chamber while the air outside the drying chamber is flown into the drying chamber, and the internal temperature of the drying chamber 100 in a state where the external air is flown into and out of the drying chamber is set to a first target temperature set in advance; in the first stage of post-drying control, when the temperature inside the drying chamber is a preset first target temperature, the air inside the drying chamber 100 is not discharged to the outside of the drying chamber while the air outside the drying chamber is not flowed into the drying chamber 100, and the temperature inside the drying chamber 100 in a state that the external air is not flowed into and out of the drying chamber is maintained at the first target temperature for a certain period of time; and repeatedly executing the first-stage early-stage drying control and the first-stage later-stage drying control until the internal humidity of the drying chamber at the time of the first-stage later-stage drying control reaches a preset first target humidity.
That is, control device 600 repeatedly executes the first-stage pre-drying control and the first-stage post-drying control until the internal humidity of the drying chamber at the time of the first-stage post-drying control reaches the first-stage target humidity (for example, 30%), thereby bringing agricultural product 20 to be dried into the first-stage drying state (for example, bringing the moisture content of the agricultural product to be dried to a predetermined value (for example, 10 to 15%) or less).
The first stage pre-drying control of the control device 600 is specifically described below with reference to fig. 6.
The first-stage preliminary drying control is a control of discharging the drying chamber interior air to the outside of the drying chamber while allowing the drying chamber exterior air to flow into the drying chamber interior, and setting the interior temperature of the drying chamber 100 in the state where the outside air flows in and out to a first target temperature set in advance.
That is, the first-stage early-stage drying control is to create a ventilation environment so that the inside of the drying chamber is not subjected to high humidity due to the moisture discharged from the agricultural product to be dried, while the ventilation environment is created in the drying chamber so as to avoid the high humidity in the drying chamber due to the moisture discharged from the agricultural product to be dried.
Specifically, the control device 600 determines the internal/external humidity of the drying chamber by using the temperature and humidity information provided by the temperature and humidity measurement subsystem 500.
When the temperature and humidity information provided by the temperature and humidity measurement subsystem 500 indicates that the humidity outside the drying chamber is lower than the humidity inside the drying chamber, the control device 600 makes the operation speeds of the suction fan 310 and the exhaust fan 320 of the suction and exhaust subsystem 300 operate at the normal operation speed to create a ventilation environment in the drying chamber as shown in fig. 6.
That is, when the first stage drying of the agricultural product to be dried is realized by discharging the moisture from the agricultural product to be dried to the outside at the first target temperature, the discharged moisture causes a high humidity (humidity equal to or higher than the moisture content of the agricultural product to be dried) in the drying chamber, and the high humidity causes that the moisture cannot be discharged further from the agricultural product to be dried, and the drying cannot be performed. In this case, in order to change the high humidity environment into the low humidity environment, a ventilation environment is created in the drying chamber so that the air inside the drying chamber is discharged to the outside of the drying chamber while the air outside the drying chamber is flowed into the inside of the drying chamber.
On the other hand, when the suction fan 310 and the exhaust fan 320 are operated in order to create a ventilation environment, if the humidity outside the drying chamber is higher than the humidity inside the drying chamber, the control device 600 causes the operation speeds of the suction fan 310 and the exhaust fan 320 of the suction and exhaust subsystem 300 to operate at a first speed lower than the normal operation speed, and at the same time, causes the refrigerant circulation device 450 of the hot air subsystem 400 to operate.
As described above, in order to prevent the interior of the drying chamber from becoming high humidity due to moisture discharged from the agricultural product, it is necessary to provide a ventilation effect to the interior of the drying chamber, and for this purpose, the suction fan 310 and the exhaust fan 320 are operated, and if the humidity of the outside air flowing into the interior of the drying chamber for the ventilation effect is higher than the humidity of the interior of the drying chamber, it is disadvantageous to dry the agricultural product. That is, the ventilation effect is to avoid the high humidity in the drying chamber, but the ventilation effect is halved if the humidity of the outside air flowing in is higher than the humidity in the drying chamber.
However, although the suction fan 310 and the exhaust fan 320 are required to be operated for the drying chamber ventilation, if the humidity outside the drying chamber is higher than the humidity inside the drying chamber, the operation speeds of the suction fan 310 and the exhaust fan 320 of the suction and exhaust subsystem 300 are operated at a first speed (for example, 30% of the normal speed) lower than the normal operation speed to generate a minimum ventilation effect, and at the same time, the refrigerant circulation device 450 of the hot air subsystem 400 is operated.
The reason for operating the refrigerant cycle device 450 is that when the humidity inside the drying chamber becomes higher due to the outside air (air having a higher humidity than the inside of the drying chamber) flowing into the drying chamber, moisture contained in the inside air of the drying chamber is adsorbed, and the humidity inside the drying chamber, which has become higher due to the inflow of the outside air, is lowered.
On the other hand, after the intake fan 310 and the exhaust fan 320 are operated for ventilation, the control device 600 grasps the internal temperature of the drying chamber 100 in the state of inflow and outflow of the outside air from the temperature and humidity information provided by the temperature and humidity measurement subsystem 500, calculates the heat generation temperature of the carbon fiber heating cable 420 for allowing the grasped temperature to reach the preset first target temperature within the preset time period from the inside of the drying chamber 100, and controls the carbon fiber heating cable 420 to generate heat at the calculated heat generation temperature.
That is, control device 600 controls the heat generation temperature of carbon fiber heating cable 420 so that the temperature inside the drying chamber increases to the first target temperature (the temperature at which the agricultural product to be dried is subjected to the first stage drying) in a state in which suction fan 310 and exhaust fan 320 are operated for the ventilation effect.
At this time, the temperature of the external air flowing into the drying chamber varies with weather and seasons, and the temperature of the drying chamber 100 into which the external air flows also varies with the temperature of the external air flowing into the drying chamber.
Accordingly, the control device 600 grasps the internal temperature of the drying chamber 100 in the inflow/outflow state of the outside air from the temperature and humidity information provided by the temperature and humidity measurement subsystem 500, calculates the heat generation temperature of the carbon fiber heating cable 420 for allowing the grasped temperature to reach the preset first target temperature within the preset period of time in the drying chamber 100, and controls the carbon fiber heating cable 420 to generate heat at the calculated heat generation temperature.
For example, when the temperature inside the drying chamber 100 into which the outside air flows is 30 and the first target temperature set in advance is 45 and the time is set in advance (for example, 30 minutes), the control device 600 calculates the heat generation temperature of the carbon fiber heating cable 420 in which the temperature inside the drying chamber, which is currently 30 minutes or less, is increased to 45 or less (for example, 100 temperature, and the carbon fiber heating cable 420 is heated at the calculated temperature), and in this case, the temperature inside the drying chamber is increased from 30 or more to 45 or less within 30 minutes.
As another example, when the temperature of the inside of the drying chamber 100 into which the outside air flows is 20 and the first target temperature set in advance is 45 and the time set in advance is 30 minutes (for example), the control device 600 calculates the heat generation temperature of the carbon fiber heating cable 420 in which the temperature of the inside of the drying chamber, which is currently 20, is increased to 45 or less within 30 minutes (for example, 130 temperature, and the carbon fiber heating cable 420 is heated at the calculated temperature), and in this case, the temperature of the inside of the drying chamber is increased from 20 or more to 45 or less within 30 minutes.
The first stage post-drying control of the control device 600 is specifically described below with reference to fig. 7.
The first-stage post-drying control of the control device 600 is a control for maintaining the internal temperature of the drying chamber 100 in a state in which the outside air does not flow in and out for a certain period of time without allowing the outside air to flow in the drying chamber 100 and without allowing the inside air of the drying chamber 100 to be discharged outside the drying chamber when the internal temperature of the drying chamber is set to the first target temperature set in advance by the first-stage pre-drying control.
Specifically, if the drying chamber internal temperature is set to the first target temperature set in advance by the first stage drying control, the control device 600 stops the suction fan 310 and the discharge fan 320 of the suction and discharge subsystem 300 as shown in fig. 7, and if the refrigerant circulation device 450 is operating, stops the suction fan and the discharge fan, and causes the carbon fiber heating cable 420 to generate heat so as to maintain the internal temperature of the drying chamber 100 in a state where the outside air does not flow in and out for a certain period of time.
That is, in the first stage pre-drying control, if the information provided from the second temperature sensor 520 indicates that the inside of the drying chamber 100 reaches the first target temperature (for example, 45 is reached), the control device 600 stops the suction fan 310 and the exhaust fan 320 to prevent the outside air from flowing into the drying chamber.
Next, the control device 600 controls the carbon fiber heating cable 420 to generate heat so that the inside of the drying chamber is kept at a first target temperature (for example, 45 target for a certain period of time (for example, 30 minutes.) at this time, the generated heat temperature of the carbon fiber heating cable 420 becomes a temperature lower than the generated heat temperature at the time of the first stage earlier drying control (the generated heat temperature at which the inside of the drying chamber is brought to the first target temperature in a predetermined period of time).
That is, the first-stage post-drying control is a control of keeping the interior of the drying chamber at a first target temperature (for example, 45 targets for a certain period of time (for example, 30 minutes)) after the drying chamber is brought into a sealed state in which the outside is not communicated, thereby actually realizing the first-stage drying of the agricultural product.
The drying (moisture discharge) is slightly performed also in the first stage earlier drying control, but the drying target agricultural product is actually dried in the first stage later drying control.
If the agricultural product is actually dried by the first-stage post-drying control, the agricultural product to be dried is formally discharged with water, and the inside of the drying chamber is brought into a high humidity state by the discharged water. If the interior of the drying chamber is in a high humidity state, the agricultural product to be dried cannot be further dried by further discharging moisture, and the first-stage early-stage drying control for imparting the ventilation effect is performed again to make the drying chamber in a high humidity state in a low humidity state.
That is, the control device 600 repeatedly executes the first-stage pre-drying control and the first-stage post-drying control, and ends the first-stage drying control when the humidity in the drying chamber at the time of the first-stage post-drying control becomes a first target humidity (for example, 30%) set in advance in the course of repeatedly executing the first-stage pre-drying control and the first-stage post-drying control.
The first target humidity (for example, 30%) set in advance at the time of the first stage post-drying control means that the agricultural product to be dried is in the first stage dry state (for example, the state in which the moisture content of the agricultural product to be dried is set to a predetermined value (for example, 10 to 15%) or less).
That is, by repeating the first-stage early-stage drying control and the first-stage later-stage drying control, the first-stage drying control is completed by control device 600, which sufficiently discharges the moisture contained in the agricultural product to a certain extent, and brings the agricultural product to be dried into the first-stage drying state (for example, brings the moisture content of the agricultural product to be dried to a certain value (for example, 10 to 15%) or less).
The second-stage drying control of the control device 600 will be specifically described below.
The second-stage drying control by control device 600 is a control for bringing agricultural product 20 to be dried into a final drying state (for example, a state in which the moisture content of the agricultural product to be dried is a predetermined value (for example, 5%) or less), and repeatedly executes the second-stage early-stage drying control and the second-stage later-stage drying control.
Specifically, the second stage drying control of the control device 600 includes: a second stage of preliminary drying control, in which, when the humidity inside the drying chamber is a first target humidity set in advance, the temperature inside the drying chamber is set to a second target temperature set in advance in a state in which the air inside the drying chamber is discharged outside the drying chamber while the air outside the drying chamber is flowed into the drying chamber 100; a second stage post-drying control, after the second stage pre-drying control, of keeping the temperature inside the drying chamber at a second target temperature for a certain period of time in a state in which the air inside the drying chamber is not discharged outside the drying chamber while the air outside the drying chamber is not flowed into the drying chamber 100; and repeatedly executing the second-stage early-stage drying control and the second-stage later-stage drying control until the humidity in the drying chamber at the time of the second-stage later-stage drying control reaches a preset second target humidity.
For example, control device 600 repeatedly executes the second-stage early-stage drying control and the second-stage later-stage drying control until the drying chamber internal humidity at the time of the second-stage later-stage drying control reaches the second-stage target humidity (for example, 5%), and causes agricultural product 20 to be dried to a final dry state (for example, a state in which the moisture content of the agricultural product to be dried is set to a predetermined value (for example, 5%) or less).
The second stage pre-drying control of the control device 600 is specifically described below with reference to fig. 8.
The second stage pre-drying control is control of letting the drying chamber outside air flow into the drying chamber and letting the drying chamber inside air be discharged to the outside of the drying chamber so that the inside temperature of the drying chamber 100 in the outside air inflow/outflow state becomes a second target temperature set in advance.
That is, the second stage early drying control is a control of creating a ventilation environment inside the drying chamber and bringing the inside of the drying chamber to a second target temperature higher than the first target temperature, thereby creating an environment in which the remaining moisture is discharged from the agricultural product to be dried to the outside.
Specifically, as shown in fig. 8, the control device 600 makes the operation speeds of the suction fan 310 and the exhaust fan 320 of the suction and exhaust subsystem 300 operate at a second speed lower than the normal operation speed to create a ventilation environment in the drying chamber.
The agricultural product to be dried is brought into a first-stage drying state in which the agricultural product to be dried is dried to a certain extent by the first-stage drying control, and is finally dried in a drying chamber at a second target temperature higher than the first target temperature by the second-stage drying control so as to be brought into a final drying state.
In the case of the second stage drying control, the agricultural product in the first stage drying state is also discharged with moisture, and in order to avoid adverse effect of the discharged moisture on the final drying, it is necessary to provide ventilation effect to the interior of the drying chamber, and therefore, the suction fan 310 and the exhaust fan 320 are operated.
At this time, the humidity of the outside air flowing into the inside of the drying chamber for the ventilation effect is higher than the humidity inside the drying chamber in the second stage drying control state. The humidity inside the drying chamber in the first stage post-drying control state immediately before the second stage drying control state is the first stage target humidity state, which is a relatively low humidity, and thus is significantly lower than the humidity of the outside air flowing inside the drying chamber for ventilation effect.
However, in order to ventilate the drying chamber, the suction fan 310 and the exhaust fan 320 need to be operated, and although the suction fan 310 and the exhaust fan 320 are operated in order to ventilate the drying chamber, the operation speeds of the suction fan 310 and the exhaust fan 320 are operated at a second speed lower than the normal operation speed (for example, about 10% of the normal speed) to generate a minimum ventilation effect.
On the other hand, after the intake fan 310 and the exhaust fan 320 are operated for minimum ventilation, the control device 600 grasps the internal temperature of the drying chamber 100 in the inflow/outflow state of the outside air from the temperature and humidity information provided by the temperature and humidity measurement subsystem 500, calculates the heat generation temperature of the carbon fiber heating cable 420 for allowing the grasped temperature to reach the preset second target temperature within the preset period of time from the inside of the drying chamber 100, and controls the carbon fiber heating cable 420 to generate heat at the calculated heat generation temperature.
That is, the control device 600 controls the heat generation temperature of the carbon fiber heating cable 420 so that the temperature inside the drying chamber increases to the second target temperature (the temperature at which the agricultural product to be dried is brought into the final drying state) in a state in which the suction fan 310 and the exhaust fan 320 are operated for the minimum ventilation effect.
At this time, the temperature of the external air flowing into the drying chamber varies with weather and seasons, and the temperature of the drying chamber 100 into which the external air flows also varies with the temperature of the external air flowing into the drying chamber.
Accordingly, the control device 600 grasps the internal temperature of the drying chamber 100 in the inflow/outflow state of the outside air from the temperature and humidity information provided by the temperature and humidity measurement subsystem 500, calculates the heat generation temperature of the carbon fiber heating cable 420 for allowing the grasped temperature to reach the second predetermined target temperature within the preset period of time in the drying chamber 100, and controls the carbon fiber heating cable 420 to generate heat at the calculated heat generation temperature.
For example, when the temperature of the inside of the drying chamber 100 into which the outside air flows is 30 and the second target temperature set in advance is 60 and the time set in advance (for example, 30 minutes) is set, the control device 600 calculates the heat generation temperature of the carbon fiber heating cable 420 in which the temperature of the inside of the drying chamber, which is currently 30 minutes or less, is increased to 60 or less (for example, 120 temperature, and the carbon fiber heating cable 420 is heated at the calculated temperature), and in this case, the temperature of the inside of the drying chamber is increased from 30 or more to 60 or less within 30 minutes.
The second stage post-drying control of the control device 600 is specifically described below with reference to fig. 9.
The second-stage post-drying control of the control device 600 is a control of keeping the internal temperature of the drying chamber 100 in a state in which the outside air does not flow into and out of the drying chamber 100 for a certain period of time without allowing the outside air to flow into the drying chamber 100 and without allowing the inside air of the drying chamber 100 to be discharged to the outside of the drying chamber when the internal temperature of the drying chamber becomes a second target temperature set in advance.
Specifically, if the drying chamber internal temperature is controlled to the preset second target temperature by the second stage pre-drying, as shown in fig. 9, the control device 600 stops the suction fan 310 and the discharge fan 320 of the suction and discharge subsystem 300 and operates the refrigerant circulation device 450, and causes the carbon fiber heating cable 420 to generate heat so that the internal temperature of the drying chamber 100 in a state where the external air does not flow in and out is maintained at the second target temperature for a certain period of time.
That is, in the second stage of the pre-drying control, if the information provided by the second temperature sensor 520 indicates that the interior of the drying chamber 100 reaches the second target temperature (e.g., 60 is reached), the control device 600 stops the suction fan 310 and the exhaust fan 320 of the suction and exhaust subsystem 300 to prevent the outside air from flowing into the drying chamber.
The control device 600 then operates the stopped refrigerant cycle device 450. The reason why the refrigerant cycle device 450 is operated is that the moisture discharged from the agricultural product to be dried during the final drying increases the humidity in the drying chamber, and the increased humidity prevents the final drying of the agricultural product, and in order to prevent this problem, the moisture contained in the air in the adsorption drying chamber decreases the humidity in the drying chamber to prevent the increased humidity in the drying chamber from preventing the final drying of the agricultural product.
Next, the control device 600 controls the carbon fiber heating cable 420 to generate heat so that the inside of the drying chamber is maintained at the second target temperature (for example, 60 target for a certain period of time (for example, 30 minutes.) at this time, the heat generation temperature of the carbon fiber heating cable 420 becomes a temperature higher than the heat generation temperature at the time of the first stage post-drying control.
That is, the second stage post-drying control is a control of keeping the interior of the drying chamber at a second target temperature (for example, 60 targets for a certain period of time (for example, 30 minutes)) after the drying chamber is sealed without communication with the outside, and thereby achieving final drying of the agricultural product.
The agricultural product to be dried is brought into a first-stage drying state in which water discharge is achieved to a certain extent by the first-stage drying control, and is brought into a final drying state by the second-stage drying control.
The agricultural products to be dried can also be discharged with water through the second-stage post-drying control, and the discharged water can increase the humidity in the drying chamber.
The increased humidity in the drying chamber prevents the moisture of the agricultural product to be dried from being discharged, and prevents the agricultural product to be dried from being in a final dried state. Therefore, it is necessary to ventilate the drying chamber in which the humidity in the drying chamber is increased, and for this purpose, the second stage preliminary drying control for exerting the ventilation effect is newly performed.
That is, the control device 600 repeatedly executes the second-stage pre-drying control and the second-stage post-drying control, and ends the second-stage drying control when the humidity in the drying chamber at the time of the second-stage post-drying control becomes the preset second target humidity (humidity lower than the first target humidity, for example, 5%) during the second-stage pre-drying control and the second-stage post-drying control are repeatedly executed.
The fact that the humidity in the drying chamber in the second stage post-drying control is a second target humidity (for example, 5%) set in advance means that the agricultural product to be dried has reached a final dry state (for example, a state in which the moisture content of the agricultural product to be dried is set to a predetermined value (for example, 5%) or less).
That is, by repeating the second-stage drying control of the second-stage early-stage drying control and the second-stage post-stage drying control, the control device 600 ends the second-stage drying control such that most of the moisture contained in the agricultural product to be dried is discharged, and the agricultural product to be dried is brought into the final dry state (for example, such that the moisture content of the agricultural product to be dried is brought to a predetermined value (a humidity lower than the first target humidity, for example, 5%) or less).
On the other hand, when drying the agricultural product 20 to be dried by the agricultural product drying system 10 of the hot air drying system based on the temperature and humidity control according to the present invention, the control device 600 controls the air intake/exhaust subsystem 300 and the hot air subsystem 400 under various control conditions, and controls the air intake/exhaust subsystem 300 and the hot air subsystem 400 so as to generate various control data by the control device 600.
The control device 600 supplies the generated various control data to the platform management server 30, and allows the platform management server 30 to use the control data as large data necessary for generating the dry management guide information.
Also, the control device 600 is applied to the agricultural product drying control using the drying management guide information provided by the platform management server 30.
Specifically, the control device 600 provides the outside remote platform management server 30 with the temperature and humidity information of the inside and outside of the drying chamber 100, the operation speed information of the intake fan 310 and the exhaust fan 320, the target temperature and humidity information of the inside and outside of the drying chamber 100, the operation speed information of the intake fan 310 and the exhaust fan 320, and the target temperature and humidity information of the target during the second-stage drying control, and uses the drying management guide information provided by the outside remote platform management server 30 to grasp the operation speed information of the intake fan 310 and the exhaust fan 320 and the first-stage target temperature and humidity information required in the first-stage drying control that conforms to the current temperature and humidity conditions of the inside and outside of the drying chamber 100, uses the grasped operation speed information of the intake fan 310 and the exhaust fan 320 and the first-stage target temperature and humidity information to execute the first-stage drying control, uses the drying management guide information provided by the outside remote platform management server 30 to grasp the operation speed information of the intake fan 310 and the exhaust fan 320 and the second-stage target temperature and humidity information required in the second-stage drying control that conforms to the current temperature and humidity conditions of the inside and outside of the drying chamber 100.
The control device 600 of the agricultural product drying system installed in each farm provides control data generated when drying the agricultural product 20 to be dried to the external remote platform management server 30. The control data provided to the remote platform management server 30 includes temperature and humidity information of the inside and outside of the drying chamber 100 at the first stage of drying control, operation speed information of the suction fan 310 and the exhaust fan 320, target temperature and humidity information, and temperature and humidity information of the inside and outside of the drying chamber 100 at the second stage of drying control, operation speed information of the suction fan 310 and the exhaust fan 320, and target temperature and humidity information.
For example, the first stage drying control is controlled such that the internal humidity of the drying chamber 100 is 50% and the external humidity is 60%, the internal temperature of the drying chamber 100 is 30% and the external temperature is 25%, the operation speeds of the suction fan 310 and the exhaust fan 320 are 90RP which are 30% of the normal operation speed 300RPM, the first stage target temperature is 45 first and the first stage target humidity is 30%, and the second stage drying control is controlled such that the internal humidity of the drying chamber 100 is 30% and the external humidity is 40%, the internal temperature of the drying chamber 100 is 35% and the external temperature is 25%, the operation speeds of the suction fan 310 and the exhaust fan 320 are 30RPM which are 10% of the normal operation speed 300RPM, the second stage target temperature is 60 second and the second stage target humidity is 5%, if so controlled, the control device 600 supplies control data (50% of the internal humidity of the drying chamber 100, 60% of the external humidity, 30% of the internal temperature of the drying chamber 100, 25% of the external temperature, 90RPM of the operating speeds of the suction fan 310 and the exhaust fan 320, 45 first target temperature, 30% of the first target humidity) during the first stage drying control and control data (30% of the internal humidity of the drying chamber 100, 40% of the external humidity, 35% of the internal temperature of the drying chamber 100, 25% of the external temperature, 30RPM of the operating speeds of the suction fan 310 and the exhaust fan 320, 60 second target temperature, 5% of the second target humidity) during the second stage drying control to the external remote platform management server 30.
The external remote platform management server 30 uses control data provided from the control device 600 of the agricultural product drying system installed at each farmer as big data to generate drying management guide information capable of drying agricultural products in an optimal drying environment, and provides the generated drying management guide information to the control device 600 of each farmer.
The control device 600 uses the drying management guide information provided by the external remote platform management server 30 to grasp the operation speed information of the suction fan 310 and the exhaust fan 320 and the first stage target temperature and humidity information required in the first stage drying control conforming to the current internal and external temperature and humidity conditions of the drying chamber 100, uses the grasped operation speed information of the suction fan 310 and the exhaust fan 320 and the first stage target temperature and humidity information to perform the first stage drying control, uses the drying management guide information provided by the external remote platform management server 30 to grasp the operation speed information of the suction fan 310 and the exhaust fan 320 and the second stage target temperature and humidity information required in the second stage drying control conforming to the current internal and external temperature and humidity conditions of the drying chamber 100, and uses the grasped operation speed information of the suction fan 310 and the exhaust fan 320 and the second stage target temperature and humidity information to perform the second stage drying control.
That is, the control device 600 of the agricultural product drying system installed at each farm can perform the drying of the drying object agricultural product 20 in the optimal drying environment using the drying management guide information provided by the platform management server 30, so that the dried agricultural product having the optimal drying quality can be obtained.
The technical spirit of the present invention has been described with reference to the accompanying drawings, but this is merely illustrative of preferred embodiments of the present invention and not limiting the present invention, and the scope of the present invention is not limited to the embodiments, and variations by those having ordinary skill in the art within the technical spirit of the present invention should be interpreted as belonging to the present invention as well.
Industrial use
The present invention is industrially useful because the temperature and humidity in a drying chamber are adjusted to the optimal conditions for drying agricultural products by repeatedly performing the drying of the agricultural products by hot air and the suction and discharge of the air in the drying chamber in stages during the drying of the agricultural products, and the drying time of the agricultural products is shortened as compared with the drying time of the agricultural products by natural drying, and the agricultural products are dried in an optimal state (the moisture content of the agricultural products is kept to a certain ratio or less).

Claims (12)

1. An agricultural product drying system of hot air drying mode based on temperature and humidity control, characterized by comprising:
A drying chamber (100) having an inner space of a predetermined size;
a drying rack (200) which is disposed inside the drying chamber (100) and is used for loading agricultural products (20) to be dried;
an air intake/exhaust subsystem (300) for allowing outside air to flow into the drying chamber (100) or discharging the inside air of the drying chamber to the outside;
a hot air subsystem (400) for heating and circulating air inside the drying chamber so as to dry the agricultural products (20) to be dried loaded on the drying rack (200);
a temperature and humidity measurement subsystem (500) for measuring the temperature and humidity inside and outside the drying chamber (100) and providing the measured temperature and humidity information to a control device (600);
the control device (600) executes a first-stage drying control for controlling the air intake/exhaust subsystem (300) and the hot air subsystem (400) by using the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) so as to bring the agricultural product (20) to be dried into a first-stage drying state, and then executes a second-stage drying control for controlling the air intake/exhaust subsystem (300) and the hot air subsystem (400) by using the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) so as to bring the agricultural product (20) to be dried into a final drying state.
2. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
the drying rack (200) is provided with a plurality of drying racks (200), the drying racks (200) are laminated structures in which a plurality of drying frames (210) loaded with agricultural products (20) to be dried can be inserted in a laminated structure,
for drying agricultural products, the drying rack (200) is fixedly arranged at the bottom inside the drying chamber (100) or is moved inside the drying chamber (100) by means of a rack movement subsystem (220).
3. The agricultural product drying system of hot air drying based on temperature and humidity control according to claim 2, wherein,
the rack movement subsystem (220) comprises:
a moving rail (221) for guiding the movement of the drying rack (200);
a moving carriage (222) detachably coupled to the drying rack (200) and mounted on the moving rail (221) so as to move the drying rack (200) on the moving rail (221).
4. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
the suction and exhaust subsystem (300) comprises:
a plurality of suction fans (310) installed at the side of the drying chamber (100) to allow external air to flow into the drying chamber (100);
A plurality of exhaust fans (320) installed at the ceiling of the drying chamber (100) so as to exhaust the air inside the drying chamber to the outside;
the plurality of suction fans (310) are operated according to the control of the control device (600) so as to adjust the suction amount of the external air flowing into the drying chamber (100),
the plurality of exhaust fans (320) are operated according to the control of the control device (600) so as to adjust the amount of exhaust of the internal air discharged to the outside of the drying chamber (100).
5. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
the hot air subsystem (400) comprises:
a mounting plate (410) formed in an area smaller than the area of the ceiling of the drying chamber (100), and mounted at a distance from the ceiling of the drying chamber (100);
a carbon fiber heating cable (420) which is installed on the upper part of the installation plate (410) for heating the air in the drying chamber (100), and controls the heating temperature according to the control of the control device (600);
a blower fan (430) mounted on the upper part of the mounting plate (410) for circulating air in the drying chamber (100);
a plurality of hot air branching plates (440) installed in a lower space of the installation plate (410) so as to branch air heated by the carbon fiber heating cable (420) to an inner space of the drying chamber (100) at the lower part of the installation plate (410);
A refrigerant circulation device (450) which operates according to the control of the control device (600) so as to adsorb moisture contained in the air inside the drying chamber (100);
the refrigerant circulation device (450) includes a refrigerant circulation pipe (451) installed at one side inside the drying chamber (100).
6. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
the temperature and humidity measurement subsystem (500) includes:
a first temperature sensor (510) measuring a temperature outside the drying chamber (100) and providing the measured temperature information to the control device (600);
a second temperature sensor (520) measuring the temperature inside the drying chamber (100) and providing the measured temperature information to the control device (600);
a first humidity sensor (530) measuring humidity outside the drying chamber (100) and providing the measured humidity information to the control device (600);
and a second humidity sensor (540) that measures the humidity inside the drying chamber (100) and provides the measured humidity information to the control device (600).
7. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
The first stage drying control of the control device (600) includes:
a first stage of preliminary drying control, wherein the air outside the drying chamber is discharged to the outside of the drying chamber while the air outside the drying chamber flows into the drying chamber, and the internal temperature of the drying chamber (100) in the state of flowing in and out the external air is set to a preset first target temperature; a first stage of post-drying control, wherein when the temperature inside the drying chamber is a preset first target temperature, the air inside the drying chamber (100) is not discharged to the outside of the drying chamber while the air outside the drying chamber is not flowed into the drying chamber (100), and the temperature inside the drying chamber (100) in a state that the external air is not flowed into and out of the drying chamber is kept at the first target temperature for a certain period of time; the first stage pre-drying control and the first stage post-drying control are repeatedly executed until the humidity in the drying chamber at the time of the first stage post-drying control becomes a preset first target humidity,
the second stage drying control of the control device (600) includes:
a second stage of preliminary drying control, in which, when the humidity inside the drying chamber is a first target humidity set in advance, the air inside the drying chamber is discharged to the outside of the drying chamber while the air outside the drying chamber is flowed into the drying chamber (100), so that the temperature inside the drying chamber is a second target temperature set in advance; a second stage post-drying control, after the second stage pre-drying control, of keeping the temperature inside the drying chamber at a second target temperature higher than the first target temperature for a certain period of time in a state in which the air inside the drying chamber is not discharged to the outside of the drying chamber while the air outside the drying chamber is not flowed into the inside of the drying chamber (100); and repeating the second stage pre-drying control and the second stage post-drying control until the humidity in the drying chamber at the time of the second stage post-drying control reaches a preset second target humidity lower than the first target humidity.
8. The agricultural product drying system of claim 7, wherein the temperature and humidity control based hot air drying mode is adopted,
the first stage pre-drying control of the control device (600) is controlled by,
if the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) shows that the humidity outside the drying chamber is lower than the humidity inside the drying chamber, the operation speeds of the air suction fan (310) and the air discharge fan (320) of the air suction and discharge subsystem (300) are operated at the normal operation speed, if the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) shows that the humidity outside the drying chamber is higher than the humidity inside the drying chamber, the operation speeds of the air suction fan (310) and the air discharge fan (320) of the air suction and discharge subsystem (300) are operated at the first speed lower than the normal operation speed, and at the same time, the refrigerant circulation device (450) of the hot air subsystem (400) is operated,
after the air suction fan (310) and the exhaust fan (320) are operated, the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) is used for grasping the internal temperature of the drying chamber (100) in an external air inflow and outflow state, calculating the heating temperature of the carbon fiber heating cable (420) for enabling the grasped temperature to reach a preset first target temperature in a preset period from the inside of the drying chamber (100), and controlling the carbon fiber heating cable (420) to generate heat at the calculated heating temperature.
9. The agricultural product drying system of claim 7, wherein the temperature and humidity control based hot air drying mode is adopted,
the first stage post-drying control of the control device (600) is controlled by,
when the internal temperature of the drying chamber reaches a preset first target temperature, the suction fan (310) and the exhaust fan (320) of the suction/exhaust subsystem (300) are stopped, and if the refrigerant circulation device (450) is operating, the cooling device is stopped, and the carbon fiber heating cable (420) is heated to maintain the internal temperature of the drying chamber (100) in a state in which the external air does not flow in and out for a certain period of time at the first target temperature.
10. The agricultural product drying system of claim 7, wherein the temperature and humidity control based hot air drying mode is adopted,
the second stage pre-drying control of the control device (600) is controlled by,
after the operation speed of the suction fan (310) and the exhaust fan (320) of the suction and exhaust subsystem (300) is operated at a second speed lower than the normal operation speed, the temperature and humidity information provided by the temperature and humidity measurement subsystem (500) is used for grasping the internal temperature of the drying chamber (100) in an inflow and outflow state of external air, calculating the heating temperature of the carbon fiber heating cable (420) of the hot air subsystem (400) for enabling the internal temperature of the drying chamber (100) in the inflow and outflow state of external air to reach a preset second target temperature in a preset time period, and controlling the carbon fiber heating cable (420) to generate heat at the calculated heating temperature.
11. The agricultural product drying system of claim 7, wherein the temperature and humidity control based hot air drying mode is adopted,
the second stage post-drying control of the control device (600) is controlled by,
when the internal temperature of the drying chamber reaches a preset second target temperature, the suction fan (310) and the exhaust fan (320) of the suction and exhaust subsystem (300) are stopped, the refrigerant circulation device (450) is operated, and the carbon fiber heating cable (420) is heated so that the internal temperature of the drying chamber (100) in a state that external air does not flow in and out is kept at the second target temperature for a certain period of time.
12. The agricultural product drying system of claim 1, wherein the temperature and humidity control based hot air drying mode is adopted,
the control device (600),
the temperature and humidity information inside and outside the drying chamber (100), the operation speed information and target temperature and humidity information of the air suction fan (310) and the air discharge fan (320) during the first stage drying control, and the temperature and humidity information inside and outside the drying chamber (100), the operation speed information and target temperature and humidity information of the air suction fan (310) and the air discharge fan (320) during the second stage drying control are provided to an external remote platform management server (30),
the first stage drying control is executed by grasping the operation speed information of the suction fan (310) and the exhaust fan (320) and the first stage target temperature and humidity information required in the first stage drying control conforming to the internal and external temperature and humidity conditions of the current drying chamber (100) by using the drying management guide information provided by the external remote platform management server (30), and by using the grasped operation speed information of the suction fan (310) and the exhaust fan (320) and the first stage target temperature and humidity information,
And grasping operation speed information of an air suction fan (310) and an exhaust fan (320) and second-stage target temperature and humidity information required in second-stage drying control conforming to the internal and external temperature and humidity conditions of the current drying chamber (100) by using drying management guide information provided by an external remote platform management server (30), and executing second-stage drying control by using the grasped operation speed information of the air suction fan (310) and the exhaust fan (320) and the second-stage target temperature and humidity information.
CN202280043697.3A 2021-11-03 2022-03-08 Agricultural product drying system adopting hot air drying mode based on temperature and humidity control Pending CN117651491A (en)

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