JPH0436582A - Dry control system for grain dryer - Google Patents

Abstract

PURPOSE:To make it possible to dry up grains even in a dry chamber on a lower stage to a satisfactory extent and hence improve dry performance by controlling dehumidified air which passes from a dry chamber on an upper stage to the dry chamber on the lower stage so that dry operation may be carried out at a low humidity and high temperature. CONSTITUTION:When grains which flow down from a storage section 1 in the upper art by way of several stages of dry chambers located top and bottom are dried by sucking up and discharging the dehumidified air generated from a dehumidification device 3 installed per dry chamber 2 by means of an exhaust fan 4 installed per dry chamber 2, the dehumidified air which passes from the dry chambers 2 on the upper stage to the dry chambers 2 on the lower stage is controlled so that it may be dried at a low humidity and high temperature. The grains are repeatedly circulated from a plurality of lower stages, for example, the dry chambers 2 on the second stage. During the recycled dry operation, the dehumidification device 3 on the lower stage side is more efficient than the dehumidification device 3 on the upper stage installed for each dry chamber 2 to suck up and discharge the dehumidified air which is set to low humidity and high temperature by means of the exhaust fan 4 installed per dry chamber 2. Therefore, the grains which pass through each dry chamber 2 individually, are exposed to the dehumidified air and dried.

Description

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

Conventional technology In the past, while grains were flowing down from the storage chamber in the upper part to the drying chambers in multiple upper and lower stages in the lower part, the dehumidified air generated from the dehumidifier installed in each drying chamber was used by the exhaust fan installed in each drying chamber. ,
By passing through each drying room and sucking and exhausting the air outside the machine, the grains flowing down each drying room are exposed to this dehumidified air and dried, but the temperature and humidity of this dehumidified air vary. It was a drying control method in which grains were dried by controlling dehumidified air at the same temperature and humidity in multiple stages.

The problem to be solved by the invention is to dehumidify grains at a temperature and humidity set by a dehumidifying device installed in each drying chamber while the grain is repeatedly circulated from an upper storage chamber to a plurality of lower drying chambers and flowing down. Wind is generated, and this dehumidified air is individually sucked and exhausted by the exhaust fan installed in each drying room, so that it passes through each drying room individually, and the grains flowing down in each drying room are removed. is exposed to this dehumidified air and dried.

During dehumidification and drying, the temperature and humidity of the dehumidified air passing through each of the upper and lower drying chambers are the same, so grains may not be dried in the lowest drying chamber. This is an attempt to solve the problem.

Means for Solving the Problems The present invention provides a method for treating grains flowing down through an upper storage chamber 1 and a lower drying chamber 2 with multiple upper and lower stages using dehumidified air generated from a dehumidifying device 3 provided separately from the drying chamber 2. In a grain dryer that dries while sucking and exhausting air with an air exhaust fan 4 provided separately from the drying chamber 2, the dehumidified air passing through the lower drying chamber 2 from the upper drying chamber 2 is controlled to have low humidity and high temperature. The drying control system is characterized by drying.

The working grains of the invention are repeatedly circulated through the upper storage chamber 1 and the lower multiple stages 5, for example, the two-stage drying chamber 2.
The lower dehumidifier 3, which is installed separately in each drying room 2, generates dehumidifying air with lower humidity and higher temperature than the upper dehumidifier 3, and this dehumidified air flows through the exhaust air installed in each drying room 2. By being individually sucked and discharged by the wind 14, the grains passing through each drying chamber 2 individually and flowing down within each drying chamber 2 are exposed to this dehumidified wind and dried.

Effects of the Invention According to this invention, the temperature and humidity of the dehumidified air generated from the dehumidifying device 3 passing through the drying chamber 2 on the lower side are lower than the temperature and humidity of the dehumidifying air generated from the dehumidifying device 3 passing through the drying chamber 2 on the lower side. By controlling the temperature at a high temperature and at a low humidity, the grains can be sufficiently dried in the drying chamber at the lower stage, which improves the drying performance of the grains. Stable.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

The ward system is dehumidifying! 3.3 is shown attached to a circulation type grain dryer 5 for drying grains.

This dryer 4115 has a rectangular shape long in the front and back direction and has a vertical wall 6.
A transfer gutter 7 in which a transfer spiral is rotatably installed and a ceiling plate 8 are provided at the upper part, and a storage chamber 1 for storing grains is formed below the ceiling plate 8.

On the lower side of the storage chamber 1, left and right drying chambers 2.2 are provided between the left and right ventilation chambers 9.9 and the central ventilation chamber 10, and these ventilation chambers 9,9. The ventilation chamber 10 and the drying chamber 2.2 are arranged in two stages, upper and lower. At the bottom of the lower drying chamber 2.2, there is a feed-out valve 11 that feeds out the grains and allows them to flow down.
．． 11 is rotatably supported.

A grain collection gutter 12 rotatably equipped with a transfer spiral is connected to the lower side of these lower drying chambers 2.2.

On the front side of the mechanism 6, the dehumidifier 3.3 is removably installed in the front and back to correspond to the ventilation chamber 10° and the population side.
, 3 and the dryer 5 are removably attached to the operating device 13 for starting and stopping operations for loading, drying, and discharging operations.

Further, on the back side of the mechanism 6, there are the left and right ventilation chambers 9 in the upper and lower stages.
．． Forming upper and lower exhaust duct chambers 14 and 14 that can communicate with 9,
The exhaust cylinder 15.15 on the rear side of the center of the exhaust passage chamber 14.14 is provided with exhaust fans 4, 4 and variable speed exhaust fan motors 16, 16 for rotating and driving the exhaust fans 4, 4 at variable speeds.

Reference numeral 17 designates a structure in which a valve motor rotationally drives the delivery valve 11.11 via a speed reduction mechanism 18.

A supply port for supplying transferred grains into the storage chamber 1 is provided at the center in the longitudinal direction of the bottom plate of the transfer gutter 7, and a supply port for distributing the grains evenly into the storage chamber 1 is provided below the second supply port. A diffusion board 19 is provided for reduction.

Grain raising [20] is provided on the outside of the vertical wall 6, and a belt with a packet conveyor 21 is stretched inside. A supply gutter 23 is provided between the lower end and the terminal end of the grain collecting gutter 12 to communicate with each other.

Reference numeral 24 denotes a grain raising machine motor, which includes a belt attached to the packet conveyor 21, the transfer spiral in the transfer gutter 7, and the spreading plate 19.
etc., and the grain transfer spiral in the grain collecting trough 12 is driven to rotate via the belt attached to the packet conveyor 21.

In the vertical direction of the grain raising machine 20, grains υ! A moisture sensor 25 is provided to detect moisture. This moisture sensor 25 is operated by transmitting an electrical measurement signal from the operating device 13 to cause a moisture motor 26 to rotate and each part of this moisture sensor 25 to be rotationally driven.
The structure is such that the grains that fall during transportation to the upper part are received, the grains are crushed under pressure, and at the same time, the water content of the crushed grains is detected.

The dehumidifiers 3, 3, which are movable by providing casters on the bottom plate, are each equipped with a compressor 27, a condenser 28, an expansion valve 29, and an evaporator 30. The outside air sucked in through the outside air suction passage 31 and this dehumidified air, which is the outside air sucked into the dehumidifier 3 and converted into dehumidified air, are mixed, and this mixed dry air is sent to the upper Tsurugi ventilation chamber. It is configured to be inhaled into IO.

The dehumidifying device 3 on the rear side is configured so that the outside air sucked into the dehumidifying device 3 is converted into dehumidified air, and this dehumidified air is sucked into the ventilation chamber 10 on the lower stage.

The dehumidifying device 3.3 converts the outside air supplied into the dehumidifying device 3.3 from the outside air inlet 32 at the front into dehumidified air with low humidity. The gas is adiabatically compressed and converted into a high-temperature, high-pressure gas in the machine 27, and when it passes through the condenser 28, heat is removed and it changes into a high-temperature, high-pressure liquid, and then the pressure decreases as it passes through the expansion valve 29. The evaporator 30
As it passes through the gas, it absorbs heat and turns into low-temperature, low-pressure gas, and this cycle is repeated one after another. Note that 33 is a motor for driving the compressor 27.

The condition of the outside air sucked into the dehumidifying device 3.3 is that it is cooled while passing through the evaporator 30, moisture in the air condenses, and the absolute humidity becomes low-temperature, low-humidity wind. Thereafter, when passing through the condenser 28 section, heat is absorbed to obtain low dehumidified air at a temperature slightly higher than room temperature.

The operating device 13 has a box shape, and the surface plate of the box has a
A start switch 34 for starting the dryer 5 and the dehumidifiers 3, 3, etc. for each operation of loading, drying, and discharging. A stop switch 35 for stopping operation, a moisture setting switch 36 for setting the finishing target moisture content of grains according to the operation position. Grain type setting setting 37 and loading amount setting 38 for setting the temperature and humidity of the dehumidifying air depending on the operating position; a digital display section 39 for alternately displaying detected grain moisture, detected drying temperature, remaining drying time, etc.; A monitor display is provided, and an outside air temperature sensor 46 for detecting outside air temperature and an outside air temperature sensor 47 for sensing outside air humidity are provided on the outside of the bottom plate.

Also, there is an A-D converter 40 inside that converts the detected value from A to D.
An input circuit 41 to which the converted value converted by this A-D converter 40 is input, an input circuit 42 to which various detected values are input,
C that performs arithmetic and logical operations, comparison operations, etc. on these input values.
A drying control device 45 comprising a PO 43, an output circuit 44 that receives various commands from the CPU 43, and outputs them.
It has a built-in configuration. The settings 36, 37, and 38 are of rotary switch type, and are configured to set predetermined values, types, etc. depending on the operating position.

Drying control of grains by the drying control device 45 is performed as follows. That is, the operation details of the moisture setting setting 36 are input to the CPU 43, and the finishing target moisture of the grain is set by this input. On the other hand, the grain moisture detected by the moisture sensor 25 is also input to the CPU 43, the input detected grain moisture is compared with the set finishing target moisture, and it is detected that the detected grain moisture has reached the finishing target moisture. Then, each operating part of the dryer 5 is automatically stopped to finish drying the grains.

Additionally, the drying control device 45 has the following functions. That is, Moeki grain type setting setting 37 and the setting amount setting 3
8 is input to the CPU 43, and the outside air temperature (TE) and outside air relative humidity (WE) detected by the outside air temperature sensor 46 and outside air humidity sensor 47 are also input to the CPU 43.
At the same time, the temperature (T) and humidity (W) of the dehumidifying air generated from the dehumidifying bag ft3.3, which are input to the CPU 43 and stored in the CPU 43, are selected from these input values. 4, the total suction air volume (Q■) to be suctioned and discharged is selected, and the configuration is such that it is controlled to be equal to each of these selected values.

For example, the grain type setting lever 37 is operated to the handle position, the loading amount setting lever 38 is operated to the 36th position, and the contents of these operations are input to the CPU 43 at the same time,
As shown in FIG. 2, when the outside air temperature (TE) of 15° C. detected by the outside air temperature sensor 46 and the outside air relative humidity (WE) of 70% detected by the outside air temperature sensor 47 are input to the CPU 43, Based on this input, the temperature (T
) is selected as 18° C. from the set memory value, and humidity (W) is selected as 50% from the set memory value.

The temperature (T) of the dehumidified air generated from the dehumidifying device 3 supplied to the drying chamber 2 in the lower stage is selected to be 22° C. from the set memory value, and the humidity (W) is selected to be 30% from the set memory value. Ru. The rotation of the compressor motors 33, 33 of the dehumidifier @3.3 is controlled so as to be equal to each of these selected values.

Also, the total suction air volume (Ql) passing through the drying chamber 2 in the upper stage is 1. off1''/sec, and the breakdown of this 1.0 go/sec is that the dehumidifying air volume (Q2) taken in from the outside air intake port 32 and converted to dehumidifying air is 0°5 m'/sec from the set memory value. The outside air flow rate (Q3) taken in from the outside air intake passage 31 is selected to be 0.5 go/sec from the set stored value.

The total suction air 11 (Ql) passing through the drying chamber 2 in the lower stage is selected as 0.5&/sec from the set memory value, and this 0.
The breakdown of 5 m/sec is that the dehumidifying air volume (Q2) taken in from the outside air intake port 32 and converted to dehumidifying air is selected from the set memory value as 0.5 rn''/sec. The configuration is such that the rotation of the exhaust fan motors 16 and 1B of the exhaust fan 4.4 is controlled so that the exhaust fan 4.4 has the same rotation.

In addition, the total suction air volume (Ql) passing through the lower drying chamber 2
is 1.0 as in the upper row! It may be configured to set and store n″/sec.

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

By operating each setting switch 36, 37, 38 of the operation device Wt13 to a predetermined position and operating the start switch 34 that starts dehumidifying drying, each part of the grain drying Wk5, the dehumidifying device 3
, 3 and moisture sensor 25 etc. are started, and the outside air temperature sensor 4
When the outside air temperature and outside air relative humidity detected by the outside temperature sensor 6 and the outside air temperature sensor 47 are input to this operating device 13, the temperature and humidity of the dehumidified air generated from the dehumidifying device 3.3 are selected and set, and The total amount of suction air to be sucked and exhausted by the exhaust fan 4.4 is selected and set.

This set dehumidifying air is generated from the dehumidifying devices 3, 3,
This dehumidified air passes individually from the ventilation chamber 10.10 to the drying chamber 2.2, and then passes through the upper and lower ventilation chambers 9.9 and the ventilation duct chamber 14.14.
The grains accommodated in the storage chamber 1 are individually sucked and exhausted by the exhaust fan 4.4, and the grains are removed from the storage chamber 1 while flowing through the upper and lower drying chambers 2, 2. The grain is dried by being exposed to dehumidified air, and is delivered to the lower part by the delivery valve 11.11 and flows down from the collection gutter 12 through the supply gutter 23 to the grain raising machine 20.
The packets are transported to the inside by the lower transfer spiral, are transported to the upper part by the packet conveyor 21, are supplied to the transfer gutter 7 via the dispensing tube 22, and are transferred from the transfer gutter 7 onto the diffusion plate 19 by the upper transfer spiral. The moisture sensor 25 is supplied, is evenly diffused and reduced into the storage chamber 1 by the diffusion plate 19, and is circulated and dried.
When the grain moisture content is the same as the finishing target moisture set by operating the moisture setting controller 36, the drying control device 45 of the operating device 13 automatically controls the drying e15 and automatically stops the grain drying. Drying is stopped.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Figure 1 is a block diagram, Figure 2 is a relationship diagram of dehumidifying air and suction air in the upper and lower drying chambers, and Figure 3 is an overall side view of the grain dryer. Figure 4 is the third
FIG. 5 is a rear view of a portion of the grain dryer, and FIG. 6 is an enlarged partially cutaway front view of a portion of the grain dryer. Explanation of symbols 1 Storage chamber 2 Drying chamber 3 Dehumidifier! 2 4 Wind Exhaust Photography Representative Hidehisa Mizuta (Figure 1, Figure 2): At 9 to 15 o'clock, the relative progress of the outside air was 70%. Figure 4 Figure 5 d 1°r

Claims (1)

[Claims] The grains flowing down from the storage chamber 1 in the upper part through the drying chambers 2 in multiple upper and lower stages in the lower part are removed by the dehumidifying air generated from the dehumidifying device 3 provided separately in the drying room 2 using the exhaust fan 4 provided separately in the drying room 2. In a grain dryer that dries while suctioning and exhausting air, a drying control method characterized in that the dehumidifying air passing through the lower drying chamber 2 from the upper drying chamber 2 is controlled to have low humidity and high temperature for drying. .