JP5545820B2 - Circulating grain dryer - Google Patents

Description

The present invention relates to a circulation type grain dryer for drying grains such as rice cakes and wheat, and more particularly to reduction of power consumption during a drying operation.

  2. Description of the Related Art Conventionally, a circulation type grain dryer has been known that aims to reduce power consumption (for example, Patent Document 1). The device described in Patent Document 1 measures the exhaust air humidity from the exhaust fan with a sensor during the drying operation, and decreases the rotational speed of the exhaust fan as the measured exhaust air humidity decreases. The amount of electric power was reduced.

Japanese Patent Laid-Open No. 3-181783

However, although the thing of the said patent document 1 obtains the effect that the amount of power consumption reduces by reducing the rotation speed of the said exhaust fan, since the ventilation rate of the air which ventilates a grain falls, it dries a grain. There has been a concern that the drying time may be prolonged due to a decrease in energy and a decrease in drying efficiency.
Accordingly, in view of the above problems, the present invention provides a circulation type grain dryer that can reduce energy consumption and perform energy-saving drying operation without lowering drying efficiency when performing drying operation. It is a subject.

In order to solve the above problems, the circulation type grain dryer of the present invention,
A storage tank section for storing grains;
A drying unit for drying the grain by passing the hot air generated by the hot air generator to the grain flowing down from the storage tank through the suction of the exhaust fan;
A discharge section for discharging grain in the drying section;
A recirculation section for returning to the reservoir tank grain discharged from the outlet portion via the upper horizontal conveyance means raising disembarkation and the reservoir tank,
A grain moisture measuring unit for measuring grain moisture;
An operation control unit that controls the hot air generation device so that the temperature of the hot air becomes an arbitrarily set temperature, and that controls the drying operation until the grain moisture value measured by the grain moisture measurement unit reaches a dry finish moisture value; ,
In the circulating grain dryer with
The operation control unit reduces the rotational speed of the exhaust fan by an arbitrary rotational speed and reduces the hot air temperature set value to an arbitrary temperature when the measured grain moisture value becomes a predetermined value or less during hot air drying. Just raise,
Technical measures were taken.

In addition, an outside air humidity sensor may be provided, and the operation control unit may further reduce the rotational speed of the exhaust fan when the outside air humidity value measured by the outside air humidity sensor is a predetermined value or less .

Further comprising a grain temperature sensor to measure the grain temperature, with increasing arbitrary rotational speed a rotational speed of the exhaust air fan when the grain temperature measurements becomes more of any adverse effect temperature grain quality, the hot air The temperature set value may be lowered by an arbitrary temperature.

Circulating type grain dryer of the present invention, in the hot air drying, if grain moisture value measured is equal to or less than a predetermined value, the exhaust air fan with decreasing arbitrary rotational speed the rotational speed of the hot air temperature setpoint Was increased by an arbitrary temperature. As a result, even if the rotational speed of the exhaust fan decreases, the hot air set temperature is increased, so that the drying energy does not decrease, and the grain is dried in a state where the grain temperature is further increased. Improves and shortens drying time. Therefore, it is possible to reduce the consumption of kerosene fuel amount corresponding to the shortened drying time, can be reduced by Ri power consumption to decrease the rotational speed of the exhaust air fan, allows energy saving drying operation.

The front perspective view in the circulation type grain dryer of the present invention is shown. The rear perspective view in the circulation type grain dryer of the present invention is shown. The front longitudinal cross-sectional view in the circulation type grain dryer of this invention is shown. The block diagram in the operation control part of this invention is shown. The flowchart of the energy saving drying operation program in this invention is shown. The setting value of an example at the time of controlling the rotation speed of an exhaust fan with the fall of the grain moisture value in the energy saving drying operation program of this invention is represented. The setting value of an example at the time of controlling a hot air temperature setting value with the fall of the grain moisture value in the energy saving drying operation program of this invention is represented.

Figure 1 is a front perspective view of a circulating type grain dryer 1 of the present invention, FIG. 2 is a rear perspective view of the upper same, FIG. 3 is a longitudinal sectional view seen from the front side of the upper same . Circulating type grain dryer 1, reservoir 2 for storing grain, the take-out portion 4 and eject the by ventilating dry air undergoing drying section 3 and the air to dry the cereal grains to the outside of the apparatus a heavy set to configure, further, the the take-out portion 4 connects grain recirculation means 5 for recirculating Installing issued cereal in the reservoir 2. The grain recirculation means 5 refers to the elevator 5a and the upper transport unit 5b. A grain dispersal device 5c facing the storage unit 2 is disposed at the conveyance end of the upper conveyance unit 5b. The storage part 2 is formed by being surrounded by a ceiling wall or a side wall. The drying unit 3 includes a hot wind tunnel 6 installed horizontally in the center of the machine body , drying chambers (grain flow passages ) 7 and 7 which are horizontally installed on both sides of the hot wind drum 6 and formed by perforated walls , and the drying chamber 7. , 7 are provided on each side of the exhaust ducts 8 , 8 .

Said one end opening of the hot air cylinder 6 Ru hot air generating device (burner) 9 is connected to provide heated air. Then, the hot air generated by the hot air generator 9, Neppudo 6, drying chamber 7, 7 and Haifudo 8, 8 to over-passing, the exhaust fan 10 provided in the air discharge port of Haifudo 8, 8 It is configured so as to be exhausted outside the machine by a suction action. The rotational speed of the exhaust fan 10 can be changed by an inverter control signal from an operation control unit 14 described later. A hot air temperature sensor 25 for measuring the temperature of the hot air is disposed inside the hot air drum 6, and a grain temperature sensor 16 for measuring the grain temperature is disposed below the drying chambers (grain flow paths ) 7 , 7. Set up. An outside air humidity sensor 17 is disposed on the outside air intake side of the burner 9. Incidentally, the side wall in the drying section 3 is provided with a lid 3a for you include your grain.

The take-out unit 4 includes a rotary valve 11 that is horizontally provided at a central position where the lower ends of the left and right drying chambers 7 and 7 intersect, a lower conveyance unit 12 that is horizontally disposed below the rotary valve 11, and the lower conveyance unit. funnel-shaped collecting grain plate was horizontally provided on both sides of 12 (dashboard) 13, is composed of 13., wherein the cereal issued to Ri therein from the rotary valve 11 is AtsumariKoku to the lower transport part 12 outside To be carried out. In addition, the conveyance termination | terminus side of the said lower conveyance part 12 is connected with the conveyance start end side of the said elevator 5a, and the conveyed grain is conveyed by the said elevator 5a. A known grain moisture meter 15 is disposed on the side of the elevator 5a.

Next, the operation control unit 14 that controls the operation of the circulating grain dryer 1 will be described. Figure 4 is a block diagram showing an example of the operation control unit 14. OPERATION control unit 14, together constitute a central unit (hereinafter referred to as "the CPU") 19, the CPU19 and input-output circuit (hereinafter referred to as "I / O") electrically connected respectively 20, write-only memory part 21 is constructed (hereinafter referred to as "ROM") and a write-read combined storage section 22 (hereinafter referred to as "RAM"). The I / O 20 is electrically connected with an operation button 23 including a drying operation button, a tension operation button, a tension amount setting dial, a finishing moisture value setting dial, and the like. This is driving operation button 23, conventional drying operation buttons or other blowing operation buttons, Ru Tei with an energy-saving drying operation mode button with the present invention. The addition the I / O20, the grain moisture meter 15 and the hot air generator 9, the elevators 5a and a rotary valve 11 the motors (not shown) power system driving circuit for driving the like 24, a drying operation conditions in addition to the input setting unit 18 for inputting set, the grain temperature sensor 16, outside air humidity sensor 17 and a hot air temperature sensor 25 that is electrically connected.

Within ROM21 of the operation control unit 14, a characteristic configuration of the present invention, the so-called energy-saving drying operation program has been stored (see the flowchart of FIG. 5).

Action:
Next, the operation of the circulation type grain dryer 1 having the above configuration will be described.
First of all, raw material graining operation is performed. After the operation is over, the input setting unit 18 sets and inputs conditions such as the dry finish moisture value and the amount of grain to be applied. Thereafter, the energy saving drying operation program (energy saving drying) is executed as follows.

Step 1, 2:
The energy-saving drying operation mode button (operation operation button 23) is pressed to start execution of the energy-saving drying operation program. When the execution of the energy-saving drying operation program is started, first, driving of the grain recirculation means 5, the rotary valve 11, the lower conveyance unit 12, and the like, which are the circulation system driving unit of the circulation type grain dryer 1, is started.

Step 3:
In this step, the hot air generator 9 (burner) is driven to start the hot air drying, hot air temperature in accordance with Chokomi amount set value of the grain is controlled. For example, as shown in the standard dry in FIG. 7 (A), for example, hot air temperature setting value when Zhang write amount "4" is set to 54 ° C., a hot air temperature of the hot air temperature sensor 25 detects the Combustion of the burner 9 is controlled to be 54 ° C. On the other hand, at this time, the is driven also starts the exhauster 10 (exhaust air fan), the rotational speed of the exhaust air fan 10 are thus controlled, for example, in FIG. 6 (A). For example, when Zhang write amount is "4" rotational speed of the exhaust air fan 10 is controlled to 1250 rpm.

Step 4:
The grain moisture meter 15 measures grain moisture and reads the value.

Step 5:
The outside humidity sensor 17 measures the outside air humidity and reads each value.

Steps 6 and 7:
It is determined whether or not the measured moisture value is equal to the dry finish moisture value. If the measured moisture value is equal to the dry finish moisture value, the drying is finished (step 7), while the dry finish moisture value is not reached. If so, go to Step 8.

Steps 8 and 9:
In this step, it is determined whether or not the grain has been gradually dried and the grain moisture measurement value has become a predetermined moisture value or less. In this embodiment, it is determined and monitored whether or not the grain moisture measurement value is, for example, 24% or less (step 8 ). If the grain moisture measurement value is 24% or less, the rotational speed of the exhaust fan 10 is decreased (step 9). Rotational speed of the exhaust air fan 10, for example, as shown in FIG. 6 (B), when Zhang write amount of "4" is reduced to 1100rpm from 1250 rpm. Thereby, power consumption can be reduced. When the grain moisture measurement value is higher than 24%, the process proceeds to step 13 described later.

Steps 10 and 11:
Next, in order to determine how much the outside air humidity measurement value is, it is determined whether or not it is a predetermined value or more (step 10). The predetermined value is, for example, 65%, and when the measured value of outside air humidity is higher than 65% (high outside air humidity), the rotation speed of the exhaust fan 10 is not changed, and the exhaust fan according to FIG. 6B described above. The number of rotations of 10 is controlled. On the other hand, when the outside air humidity measurement value is 65% or less (low outside air humidity), control is performed to further reduce the rotational speed of the exhaust fan 10 according to FIG. 6C (step 11). For example, when Zhang write amount of "4" is reduced to 1030rpm from 1100 rpm. Thereby, power consumption can further be reduced.

Step 12:
In this step, correction of the hot air temperature set value that accompanies the reduction in the rotational speed of the exhaust fan 10 is performed . The correction of the hot air temperature set value is performed by reducing the rotational speed of the exhaust fan 10 in the step 9 and step 11, thereby reducing the amount of hot air passing through the drying chamber 7 and the associated drying energy. In order to compensate for the decrease, the hot air temperature set value is increased by an arbitrary temperature. Specifically, for example, in Zhang write amount is "4", since moisture content of below 24%, when the rotational speed of the exhaust air fan 10 was reduced from 1250rpm to 1100rpm, the hot air temperature setpoint 54 ° C. performing on temperature causes control to 59 ° C. (see FIG. 7 (a) and FIG. 7 (B)). Further, outdoor air humidity measurements, as described above in 65% or less (low ambient humidity), when further reducing the rotational speed of the exhaust air fan 10 performs control which causes increased further increasing the hot-air temperature setpoint. For example, Zhang write amount "4", with moisture content of 24% or less, because the outside air humidity is 65% or less, when the rotational speed of the exhaust air fan 10 was reduced from 1100rpm to 1030rpm, the hot air temperature setpoint 59 ° C. performed on temperature causes control to 61 ° C. from (see FIG. 7 (B) and FIG. 7 (C)).
As a result, a decrease in drying energy is compensated for, so that the drying speed does not decrease. Rather, by raising the hot air temperature setting value, the ventilating hot air temperature rose to crops, increases the grain temperature than before, thereby performing an operation progress of the drying is quickened.

Step 13:
The grain temperature is measured by the grain temperature sensor 16 and the value is read.

Steps 14, 15, 16:
In this step, the grain temperature is checked so that the temperature of the grain during drying does not rise too much and adversely affects grain quality. Specifically, it is determined whether or not the grain temperature measurement value in Step 13 is equal to or higher than a predetermined temperature (for example, 40 ° C.) (Step 14), and when the grain temperature measurement value is 40 ° C. or higher, the grain temperature is too high. And the rotational speed of the exhaust fan 10 is increased (step 15), and the hot air temperature set value is decreased (step 16). For example, when Zhang write amount rotational speed of the exhaust air fan 10 at "4" is 1100rpm is (see FIG. 6 (B) and FIG. 6 (A)) is lifted and the 1250 rpm, the hot air temperature setting from 59 ° C. The temperature is lowered to 54 ° C. (see FIGS. 7B and 7A). Similarly, when for example Zhang write weight of 1030rpm rotational speed of the exhaust air fan 10 is "4", together with the increase in the 1100 rpm (see FIG. 6 (C) and FIG. 6 (B)), the hot air temperature setpoint lowered to 59 ° C. from 61 ° C. (refer to FIG. 7 (C) and FIG. 7 (B)). After this process, the process returns to step 4 and the above steps are repeated. On the other hand, when the measured grain temperature is less than 40 ° C., it is determined that the grain temperature is a safe temperature that does not adversely affect grain quality, and the process returns to step 4 and repeats the above steps.

The present invention, by executing the energy-saving drying operation program, when the grain moisture value is equal to or less than the predetermined value, it is possible to reduce the power consumption by reducing the rotational speed of the exhaust air fan 10. Further, since the hot air set temperature is increased as the rotational speed of the exhaust fan 10 is decreased, drying is performed without lowering the drying energy and further increasing the grain temperature. As a result, the drying efficiency is improved, the drying time is shortened, and the amount of kerosene fuel consumption can be reduced because it is not necessary to use kerosene fuel by the amount of the shortened drying time. As described above, the energy-saving drying operation and the drying time can be shortened.

  In the above embodiment, only whether or not the outside air humidity is 65% or less is determined, but this is further determined stepwise by a plurality of values to control the exhaust fan and hot air temperature set value. You may do it.

  With the circulation type grain dryer of the present invention, when grain is dried, energy saving and drying time can be further shortened.

DESCRIPTION OF SYMBOLS 1 Circulating grain dryer 2 Storage part 3 Drying part 3a Opening / closing lid 4 Extraction part 5 Grain recirculation means 5a Elevator 5b Upper conveyance part 5c Grain disperser 6 Hot air drum 7 Drying chamber 8 Exhaust air drum 9 Hot air generating means (burner)
10 Ventilator (exhaust fan)
DESCRIPTION OF SYMBOLS 11 Rotary valve 12 Lower conveyance part 13 Grain collection board 14 Operation control part 15 Grain moisture meter 16 Grain temperature sensor 17 Outside air humidity sensor 18 Input setting part 19 Central processing part (CPU)
20 I / O circuit (I / O)
21 Write-only memory (ROM)
22 Write / read memory unit (RAM)
23 Operation button 24 Power system drive circuit 25 Hot air temperature sensor

Claims (3)

A storage tank section for storing grains;
A drying unit for drying the grain by passing the hot air generated by the hot air generator to the grain flowing down from the storage tank through the suction of the exhaust fan;
A discharge section for discharging grain in the drying section;
A recirculation section for returning to the reservoir tank grain discharged from the outlet portion via the upper horizontal conveyance means raising disembarkation and the reservoir tank,
A grain moisture measuring unit for measuring grain moisture;
An operation control unit that controls the hot air generation device so that the temperature of the hot air becomes an arbitrarily set temperature, and that controls the drying operation until the grain moisture value measured by the grain moisture measurement unit reaches a dry finish moisture value; ,
In the circulating grain dryer with
The operation control unit reduces the rotational speed of the exhaust fan by an arbitrary rotational speed and reduces the hot air temperature set value to an arbitrary temperature when the measured grain moisture value becomes a predetermined value or less during hot air drying. Circulating grain dryer characterized by raising only. 2. The circulation type grain drying according to claim 1, further comprising an outside air humidity sensor, wherein the operation control unit further reduces the rotational speed of the exhaust fan when an outside air humidity value measured by the outside air humidity sensor is a predetermined value or less. Machine. Comprising a grain temperature sensor to measure the grain temperature, along with when grain temperature measurements becomes more of any adverse effects on grain quality temperature increases by an arbitrary rotational speed a rotational speed of the exhaust air fan, the hot air temperature setting The circulating grain dryer according to claim 1 or 2 , wherein the value is lowered by an arbitrary temperature.

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