JPH03181783A - Drying control method of grain dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a drying control method for a grain dryer.

(Prior Art) Conventionally, a dehumidifying device generates dehumidifying air at a predetermined temperature and humidity for grains in a grain drying chamber.

This is a drying control method in which this dehumidified air is ventilated into this drying room, and is sucked and exhausted by an exhaust fan to dry the air.The dehumidified air from the dehumidifier is controlled based on the exhaust humidity of this exhaust air and the outside air humidity. It was a drying control method that did not perform drying.

(Problem to be Solved by the Invention) The grains housed in the grain drying chamber are exposed to dehumidified air having a predetermined temperature and humidity set by a dehumidifier, and this dehumidified air passes through the drying chamber. The grains in the drying chamber are exposed to the dehumidified air and dried by suction and exhaust air from the air exhaust machine.

At the beginning of this dehumidifying and drying work, the exhaust air humidity is almost 100%.
The exhaust air humidity is close to 70% when near the end of drying.
Therefore, in such cases, the amount of suction air sucked and discharged by the exhaust fan is reduced to produce saturated dehumidifying air, improving the dehumidifying effect and reducing power consumption. This is an attempt to effectively dry grains.

(Means for Solving the Problems) This invention ventilates the grains in the grain drying chamber 1 by dehumidifying air from the dehumidifying device 2 into the grain drying chamber 1, and sucks and exhausts the grains outside the premises using the exhaust fan 3. In a grain dryer for drying grains, a suction air volume to be sucked and discharged by the exhaust fan 3 is set based on the exhaust air humidity detected by the exhaust air humidity sensor 4, and the set suction air volume and the outside air humidity sensor 5 are The drying control method is characterized in that the dehumidifying air from the dehumidifier W2 is controlled and dried based on the outside air humidity detected by the dehumidifier W2.

(Operation of the Invention) The grains stored in the grain drying chamber 1 of the grain dryer are sucked and discharged by the dehumidifying air generated from the dehumidifying device W2 through the drying chamber 1 and being sucked out by the exhaust fan 3. By blowing, the grains in the upward direction of the drying room are exposed to the dehumidified air and dried.

During this dehumidifying and drying work, the exhaust air humidity sensor 4 detects the humidity of the exhaust air sucked and exhausted by the exhaust fan 3, and the detected exhaust air humidity increases with the high humidity. The suction air volume to be sucked and discharged is set to increase, and based on the set suction air volume and the detected outside air relative humidity detected by the outside air humidity sensor 5, the dehumidification capacity of the dehumidifier 2 is controlled, for example, of a compressor. The rotational speed is controlled to increase or decrease, and the dehumidifying air from the dehumidifying device 2 is controlled to dry the grains.

(Effect of the invention) According to the present invention, the suction air volume of the exhaust fan 3 is set based on the humidity of the exhaust air sucked and exhausted by the exhaust fan 3, and the set suction air volume and the outside air relative humidity of the outside air are equal to each other. Can effectively dry grains.

(Example) The farm will explain a state in which a circulation type grain dryer 6 is equipped with a dehumidifying device 2.

This dryer 6 has a rectangular shape that is long in the front and back direction, and has a transfer gutter 8 and a ceiling plate 9 equipped with a rotatable transfer spiral at the upper end of the machine wall 7, and the lower side of the ceiling plate 9 stores grains. A storage chamber 10 is formed, and grain drying chambers 1 are provided on the lower side of the storage chamber 10 between ventilation chambers 11 on both left and right sides and a ventilation chamber 12 in the center for communication. A feed-out valve 13 for feeding and flowing grains is rotatably supported at the bottom of each drying electrician, and a grain collection gutter 14 rotatably equipped with a transfer spiral is provided below each drying chamber 1 for communication. The configuration is
The exhaust chamber 11 is provided with an exhaust air humidity sensor 4 for detecting the humidity of the exhaust air passing through the exhaust chamber 11.

The front machine wall 7 is provided with an operating device 5 for starting the dehumidifying device [2, the dehumidifying device W2, and the dryer 6] separately for each operation of drying and discharging. Blow room 1
2 are in communication with each other, an exhaust duct electrical work 6 is formed on the rear side of the rear machine wall 7, and an exhaust fan 3 is provided on the rear side of the exhaust duct chamber 16. A variable speed exhaust fan motor 17 that rotates at variable speeds is provided, and this exhaust fan 3 and each wandering air chamber 11 are connected to each other.
is a configuration in which each of the delivery valves 13 is connected to the deceleration mechanism 1 at the lower part of the rear machine wall 7.
This configuration includes a valve motor L9 that is rotationally driven via a valve motor L9.

In the center of the lower part of the transfer gutter 8, the transferred grains are stored in the storage chamber 1.
A supply port for supplying grains into the storage chamber 10 is provided, and a diffusion plate 20 is provided below the supply port to uniformly diffuse and return grains into the storage chamber 10.
This is a configuration with a

The grain raising machine 21 is provided in the front part of the front machine wall 7, and a packet conveyor 22 belt is stretched inside, and a discharging cylinder 23 is provided between the upper end and the starting end of the transfer gutter 8 for communication. let me,
A supply gutter 24 is provided between the lower end and the terminal end of the grain collection gutter 4 for communication.

A grain raising machine motor 25 is provided above the grain raising machine 21, and the grain raising machine motor 25 rotationally drives the packet conveyor 22 belt, the transfer spiral in the transfer@8, and the spreading plate 20. The transfer spiral in the grain collecting trough 14 is rotatably driven via the bucket 1-conveyor 22 belt, and a moisture sensor 26 for detecting grain moisture is provided at the vertically central portion. Reference numeral 26 designates a structure in which a moisture motor 27 installed in the moisture sensor 26 is rotated by the transmission of an electrical measurement signal from the operating device 15, and each part of the moisture sensor 26 is rotationally driven to detect grain moisture. .

The dehumidifier 2 has a box shape, and the front wall plate of the box body is provided with an inlet 28 for sucking outside air, and the rear wall plate is provided with an inlet 28 for sucking outside air into the dehumidifier 2. The configuration includes an air outlet 29 that blows the converted dehumidified air into the air blowing chamber 12, and in order to convert the outside air sucked into the dehumidifier 2 into dehumidified air, low-temperature, low-pressure refrigerant is used. The gas is adiabatically compressed into high-temperature, high-pressure gas in the compressor 30, and when it passes through the condenser 31, it loses heat and changes into a high-temperature, high-pressure liquid.Then, the pressure is reduced to a low-temperature, low-pressure liquid in the expansion valve 32, and then When passing through the evaporator 33, the refrigerant absorbs heat and changes into low-temperature, low-pressure gas, and as the refrigerant sequentially repeats this cycle,
It is configured to dehumidify the outside air passing through the dehumidifier 2.

The condition of the outside air sucked into the dehumidifier 2 is that when it passes through the evaporator 33, it is cooled and moisture in the air condenses, resulting in low-temperature, low-humidity wind with a decrease in absolute humidity, and its double nuclear condensation. The compressor 30 is configured to absorb heat when passing through the compressor 31 to obtain dehumidified air with a temperature slightly higher than room temperature, and the compressor 30 is rotationally driven by a variable speed compressor motor 34 that rotates at variable speeds. The rotational speed of the compressor 30 is controlled to drive the compressor 30 at variable speeds, the dehumidifying capacity of the compressor 30 is controlled, and the dehumidifying air generated from the dehumidifying device 2 is controlled. This configuration includes a heater 35 for supplementary heating of the wind.

The operating device 15 has a box shape, and the surface plate of the box has a
A start switch 36 and a stop switch 37 for starting the dryer 6 and the dehumidifying device 12 for each operation of loading, drying and discharging. Moisture setting setting 38° to set the finishing target moisture content of grains according to the operating position; Grain type setting setting 39. to set the grain type according to the operating position. A display window 40 and a monitor display are provided to alternately display detected grain moisture, detected drying temperature, remaining drying time, etc., and an outside air humidity sensor 5 is provided on the outside of the bottom plate to detect the outside air relative humidity. ,
Inside, there is an A-D converter 41 for A-D converting each detected value.
Input circuits 42 and 43 to which the converted value converted by the A-D converter 41 and each input value are input, a CPU 44 that performs arithmetic and logical operations and comparison operations on the input values, and an output circuit that outputs various commands. The drying control device 46 includes a drying control device 45, etc., and each setting switch 38, 39 is of a rotary switch type, and a predetermined value, type, etc. are set according to the operating position.

The drying control by the drying control device 46 is performed as described below. When the moisture setting switch 38 is operated, this operation is input to the CPU 44, and the finishing target moisture of the grain is set by this input.

The grain moisture detected by the moisture sensor 26 is
The input detected grain moisture content is compared with the set finishing target moisture content, and when the detected grain moisture content becomes the same as the finishing target moisture content, this drying control device 46 automatically controls the drying machine 6. It is configured to automatically stop and stop drying the grains.

The exhaust air humidity in the exhaust air chamber]-1 is detected by the exhaust air humidity sensor 4.
When the input value of the detected exhaust air humidity is 1, for example, 60%, as shown in FIG. The suction air volume sucked and discharged by the exhaust fan 3 is 0, 5
m/see, and the rotation speed of the exhaust fan motor 17 is set to 250 Or. .

This exhaust fan 3 is controlled to rotate at 1800 r, p, ■
It is configured to be rotationally driven and controlled, and when the detected exhaust air humidity is input as 80%, the suction air volume is 0, 9.
rr? /see, and the suction air volume sucked and discharged by the exhaust fan 3 is the selected 0, 9 rrr/see.
The rotational speed of the exhaust fan motor 17 is set at this CP so that
U44 controls the rotation to 4500 r, p, m rotations, and this exhaust fan 3 is configured to be rotationally controlled to rotate 3240 r, p, m rotations.

When the outside air relative humidity of the outside air is detected by the outside air humidity sensor 5 and inputted to the CPU 44, the input value of the detected outside air relative humidity is, for example, 70% between 55% and 74%. Then, if the suction air volume selected at this time is 0.5rrI''/see, the rotation speed of the compressor 30 set and stored in the CPU 44 is as shown in FIG. In order to rotate the compressor 30 at 1800r,p,m rotations, the rotational speed of the compressor motor 34 is set and stored in the CPU 44 to 2000r. ,pm
The rotation of the dehumidifying bag is controlled by the drying control device 46! The configuration is such that the dehumidification capacity of 2 is controlled, the detected outside air relative humidity is 70%, and the selected suction air volume is 0.9 m.
13/sec, the rotation speed of the compressor 300 is selected as 3240 r, p, m, and the compressor 30
The rotational speed of the compressor motor 34 is rotationally controlled to 3600r, pm rotation which is set and stored in this CPU 44, and the drying control device 46 This is a configuration in which the dehumidifying ability of the dehumidifying device 2 is controlled.

The temperature of the dehumidified air generated from the dehumidifying device 2 is
When the temperature is lower than the set temperature set and stored in the CPU 44, the CPU 44 controls the energization of the heater 35 for a predetermined time set and stored in the CPU 44.

Hereinafter, the operation of the above embodiment will be explained.

Each part of the grain dryer 6, the dehumidifier 2, the moisture sensor 26, etc. can be adjusted by moving the setting knobs 38 and 39 on the upper operating device 5 to predetermined positions and operating the start switch 36 that starts dehumidifying and drying work. is started, dehumidifying air is generated from the dehumidifying bag @2, and this dehumidifying air passes through the air outlet 29, the air blowing chamber 12, the grain drying chamber 1, and the air exhaust chamber 11. The grains stored in the storage chamber 10 are exposed to this dehumidified air while flowing down from the storage chamber 10 into the drying chamber 1 by being suctioned and exhausted by the exhaust fan 3 through the ventilation path chamber 16. The grains are fed to the lower part by the delivery valve 3, flow down, are transferred from the grain collection gutter 14 through the supply gutter 24 into the grain raising machine 21 by the lower transfer spiral, and are conveyed to the upper part by the packet conveyor 22. The liquid is supplied into the transfer gutter 8 through the dispensing tube 23, and from the transfer gutter 8, it is transferred and supplied onto the diffusion plate 20 by the upper transfer spiral, where it is evenly diffused and reduced into the storage chamber 10. When the moisture sensor 26 detects the same grain moisture as the finishing target moisture set by operating the moisture setting switch 38, the drying control device 46 of the operating device 15 automatically controls and Drying of grains is stopped by automatically stopping the dryer 6.

During this dehumidifying and drying work, the humidity of the exhaust air in the exhaust chamber 11 is detected by the exhaust air humidity sensor 4, and the amount of suction air to be sucked and exhausted by the exhaust fan 3 is selected based on the detected exhaust air humidity. , this exhaust fan 3 is adjusted so that the selected suction air volume is achieved.
The rotation speed of the exhaust fan motor 17 that rotationally drives the is controlled,
The rotational drive speed of the exhaust fan 3 is controlled, the selected suction air volume and the outside air relative humidity of the outside air are detected by the outside air humidity sensor 5, and the compressor 3 of the dehumidifier 2 is The rotational speed of the compressor motor 34 that rotationally drives this pressure machine 30 is controlled so that the rotational speed of the compressor motor 34 is controlled so as to achieve the selected dehumidification ability. The number of dehumidifiers is controlled to control the dehumidifying capacity, and the dehumidifying air from the dehumidifying device 2 is controlled to dry the grains.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a relationship diagram between exhaust air humidity and suction air volume, and Fig. 3 is a diagram showing the relationship between exhaust air humidity and suction air volume.
The figure shows the relationship between suction air volume, outside air relative humidity, and compressor rotation speed, Figure 4 is an overall side view of the grain dryer, and Figure 5 shows the relationship between the
FIG. 6 is a rear view of a portion of the grain dryer, and FIG. 7 is an enlarged partially cutaway front view of a portion of the grain dryer. In the figure, the symbol ↓ indicates a grain drying room, 2 indicates a dehumidifier, 3 indicates an exhaust fan, 4 indicates an exhaust air humidity sensor, and 5 indicates an outside air humidity sensor.

Claims (1)

[Claims] In a grain dryer that dries grains in a grain drying chamber 1 by passing dehumidified air from a dehumidifying device 2 into the grain drying chamber 1 and sucking and exhausting the grains outside the machine with an exhaust fan 3, the exhaust air humidity is Based on the exhaust air humidity detected by the sensor 4, a suction air volume to be sucked and exhausted by the exhaust fan 3 is set, and the dehumidifier 2 operates based on the set suction air volume and the outside air humidity detected by the outside air humidity sensor 5. A drying control method characterized in that drying is performed by controlling the dehumidified air from the air.