JPH01155184A - Controller for speed of drying of circulation type cereal drier - Google Patents

Abstract

PURPOSE: To accurately control the drying speed of a grain until the drying is completed by accurately correcting the humidity difference of inflow and outflow air to a value corresponding to the amount of water eliminated from the grain and accurately controlling the drying speed. CONSTITUTION: Until the water of a grain stored in a grain storage part 1 reaches finishing water, drying air heated by a burner 12 is blown to a drying part 5 and at the same time the grain is circulated to the drying part 5 from the grain storage part 1. Then, by utilizing that the difference between the soluble humidity of the inflow drying air supplied to the drying part 5 and that of outflow air corresponds to the amount of water eliminated from the grain, the combustion of the burner 12 is controlled so that a drying speed is maintained at a set speed based on the difference of the absolute humidity of the inflow and outflow air of the drying part 5. However, since water eliminated from the grain that is detected as the different between the humidity of the inflow air and that of the outflow air causes an error because of water generated in accordance with the combustion of the burner 12, the difference is automatically corrected according to the amount of fuel supply.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a drying section that heats and dries grain supplied from a grain storage section, and a drying section that returns grain discharged from the drying section to the grain storage section. an air blower that blows drying air to the drying section; a combustion device that heats the drying air by burning a fuel that generates moisture as it burns; and an air inlet of the combustion device. an incoming air humidity detecting means for detecting a rapid change in the absolute humidity of the air, and an exhaust humidity detecting means for detecting the absolute humidity of the exhaust air discharged from the drying section; and a humidity difference calculating means for calculating the difference between the inlet air humidity and the exhaust air humidity based on the detection information of the humidity detecting means, and based on the humidity difference calculated by the humidity difference calculating means, the combustion The present invention relates to a drying speed control device for a circulating grain dryer, which is provided with combustion control means for controlling the amount of fuel supplied to the device.

[Conventional technology]

If the grain drying speed is too fast, there is a risk of so-called shell cracking, and if the drying speed is too slow, the drying efficiency decreases, so it is desirable to maintain the grain drying speed at a set speed.

Therefore, the drying speed control device described above can quantitatively detect the drying speed by determining the actual moisture removed from the grain by determining the difference between the absolute humidity of the incoming air in the drying section and the absolute humidity of the exhaust air. Then, based on the determined humidity difference between the inlet air humidity and the exhaust air humidity, the amount of fuel supplied to the combustion device that heats the drying air is controlled so that the drying speed becomes the set speed. It is.

(Problems to be Solved by the Invention) Grain becomes difficult to dry as its moisture content decreases as drying progresses. This will increase the amount of fuel supplied to the device.

However, since the combustion equipment that heats the drying air generates water as it burns the fuel, the actual absolute humidity of the exhaust gas discharged from the drying section is determined by the moisture removed from the grain and the combustion equipment. There is a possibility that the drying efficiency will be lowered due to the influence of both the amount of moisture generated from the

In particular, at the end of the drying period when the moisture content of the grain decreases and it becomes difficult to dry the grain, the amount of fuel supplied increases as described above, and the amount of moisture generated from the combustion equipment increases considerably. Even though the amount of moisture removed from the drying process has decreased considerably and the drying rate has decreased considerably, it is incorrectly detected that the drying rate is maintained within the set Zu range, resulting in a drop in drying efficiency of 11. becomes.

The present invention has been developed in view of the above circumstances, and its purpose is to accurately control the drying speed of grains until the completion of drying. 11
1.

[Means for solving the problem] Drying speed of the circulating varnish type grain dryer according to the present invention? :[I
The characteristic configuration of the device is that fuel supply star detection means for detecting the fuel supply amount of the combustion device is provided, and the humidity difference calculation means is configured to:
The difference between the inlet air humidity and the exhaust air humidity is corrected to a smaller value as the amount of fuel supplied increases, and its functions and effects are as follows.

[For production]

In other words, water molecules generated from a combustion device correspond to the amount of fuel supplied so that the larger the amount of fuel supplied, the difference between the inlet humidity and exhaust humidity is calculated based on the amount of fuel supplied. By correcting the value to a smaller value as the supply amount increases, the humidity difference of the large exhaust air calculated by the humidity difference calculating means is made to be a value that accurately corresponds to the amount of moisture removed from the grain in the drying section. It is.

〔Effect of the invention〕

Therefore, the humidity difference between large exhausts and the moisture removed from the two
Since the drying speed can be accurately corrected to a value corresponding to the As a result, it has become possible to efficiently dry grains up to the point where drying becomes difficult.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 3 to 5, a grain storage section (1) that is rectangular in plan view is formed in the upper part of the fuselage, and below the grain storage section (1), a ri'il grain storage section is formed. Two drying passages (2) that allow the grain stored in (1) to flow down under their own weight.
and a hot air introduction cylinder (4) that introduces hot air for drying into the drying passage (2) through ventilation holes (3) in the wall forming each of the drying passages (2). 5) is provided.

At the lower end of each of the drying passages (2), a cylindrical 17-tally valve (6) having a recessed groove for accommodating grains in the axial direction on the outer periphery is provided, and the rotary valve (6) The grains taken out from the drying passageway (2) at set intervals at set times are fed sideways and collected on the side of the machine, to the lower screw conheir (7) and its lower screw conheir (7). The grains that are fed horizontally are stored in the grain storage section (1).
) side” bucket conveyor (8)
and an upper screw conveyor (9) that transports the grains lifted by the bucket conveyor (8) to the upper center side of the grain storage section (1), and the upper screw conveyor (9). A spreading rotating body (10) is provided to spread and drop the grains that have been fed across the grains toward the inner circumferential wall of the grain storage section (1). A transport section (11) is formed for returning the grains to the grain storage section (1).

A burner (12) for heating the outside air introduced from below outside the fuselage is provided inside the hot air introduction barrel (4), and a burner (12) is provided on the side wall of the fuselage opposite to the burner (12). A suction fan (13) is provided for sucking and ejecting the drying air heated in step (12) from one end of the drying section (5) toward the other end.

That is, the suction fan (13) is connected to the drying section (5).
The burner (12) corresponds to a blower device that blows drying air, and the burner (12) corresponds to a combustion device that heats the drying air.

However, the burner (12) is configured to burn kerosene as a fuel that generates water as it burns.

In the figure, (14) is a fuel tank, (15) is a suction motor that rotationally drives the suction fan (13), and (16) is a suction motor that rotationally drives the suction fan (13).
) is a transport motor that drives the bucket conveyor (8) and the upper screw conveyor (9), (17) is a lower screw motor that drives the lower screw conveyor (7), and (18) is the rotary valve ( (19) is a dust removal fan provided on the conveyance starting end side of the upper screw conveyor (9), (20) is its driving motor, (21) is the bucket A loading hopper is provided at a lower side of the conveyor (8), and grains to be dried are fed into the primary body from this loading hopper (21).

(S7) is a moisture meter that takes in a portion of the grains transported by the bucket conveyor (8) and measures its moisture; (S7) a burner (12) that generates hot air; Hot air temperature sensor that detects temperature (S3) is +
An inlet air temperature sensor detects the temperature of the outside air entering the burner (12), (S4) an inlet humidity sensor that detects the humidity of the inlet air, and (S7) the suction fan (13).
An exhaust temperature sensor (S6) detects the temperature of the exhaust gas from the drying section (5) which is sucked and discharged outside the machine, and (S6) is an exhaust humidity sensor that detects the humidity of the exhaust gas.

Next, a control configuration for controlling the operation of the dryer of the above-mentioned (Z4 configuration) will be explained.

As shown in Figure 1, there is a manual grain type setting device (22) for setting the type of grain to be dried, a manually operated grain setting device (23) for setting the amount of grain to be dried, and a manual setting device (23) for setting the amount of grain to be dried. A finishing moisture setting device (24) for setting and inputting the moisture content, a drying speed setting device (25) for manually setting a target drying speed per unit time, and a fuel supply from the fuel tank (14) to the burner (12). A fuel flow sensor (S7) is provided to detect the amount of fuel, and the amount of fuel supplied to the burner (12) is adjusted based on the setting device fla by the setting device and the detection information of the various sensors. In addition to controlling the pump (26), the suction fan moke (15), the conveyance motor (16), the lower screw motor (I7), the valve motor (I8),
and a driving motor (20) for the dust removal fan (19).
A control device (27) is provided for controlling the operation of the microphone I'J combination, and the evening paper.

Basically, the control device (27) controls the moisture content of the grains stored in the grain storage section (1) until the moisture content of the grains reaches the finish moisture content manually set in the finish moisture setting 23 (24). The grains are configured to be circulated between the grain storage section (1) and the drying section (5) while blowing drying air heated by burning a burner (12) to the drying section (5). has been done. The difference between the incoming absolute humidity of the drying air supplied to the drying section (5) and the absolute humidity of the exhaust gas discharged from the drying section (5) is determined by
) to maintain the drying speed at a set speed based on the difference in absolute humidity between the input and exhaust air of the drying section (5), using the fact that the drying speed corresponds to the amount of moisture removed from the grain in step 11; 1
This controls the combustion of the burner (12).

However, since the burner (12) is configured to burn kerosene, it generates a large amount of water as the burner burns, the more the amount of fuel is supplied. Since moisture causes an error in the moisture removed from the grain, which is detected as the difference between the inlet air humidity and the exhaust air quality, the difference between the inlet air humidity and exhaust air humidity is automatically calculated according to the fuel supply amount. This should be corrected accordingly.

That is, by using the control device (27) as fII, 1;
Inlet air humidity detection means (100) for detecting the absolute humidity of air entering the drying section (5); and exhaust humidity detection stage 1 (101) for detecting the absolute humidity of the exhaust gas discharged from the drying section (5).
, a humidity difference calculating means (102) for calculating the difference between the incoming air humidity and the exhaust air humidity based on the detection information of the incoming air humidity detecting means (+00) and the air temperature detecting means (101); Combustion control means (10) that controls the amount of fuel supplied to the burner (12) as the combustion device based on the humidity difference.
3) People will be constituted.

Next, based on the flow chart 1=-1- shown in FIG.
The operation of the control '4' II device (27) will be explained.

First, before starting the operation of the dryer, set the grain type setting device (22), the filling amount setting device (23), the finishing moisture setting device 2S (24), and the drying speed setting device (25).
) are manually operated to manually set the grain type, loading amount, finished moisture content, and target drying speed as operating conditions.

Next, the inlet air temperature sensor (S3) detects the inlet air temperature as the outside air temperature, and the temperature of the hot air generated by the burner (12) is set, and the grain is stored in the grain storage section (
1) and the drying section (5) is set.

However, the hot air temperature corresponding to the air input temperature is
! Depending on the IJ type, setter 1. It's something I let happen.

In addition, the circulation speed is i (0 per unit time when the pulp motor (1B) in I is operated) corresponding to the amount of filling.
8 hours is adjusted and set, and the relationship between the amount of tightening and 08 hours is preset and stored so that the larger the amount of tightening, the higher the WJ ring speed.

Next, the burner (12) is ignited and the respective motors are started to start drying.

It should be noted that each motor other than the valve motor (18) rotates at a constant rate and its rotational speed is not controlled.

When drying starts, based on the detection information of the hot air temperature sensor (S7), so that the hot air temperature reaches the set hot air temperature,
After controlling the fuel pump (26) and performing the combustion control In, +7i1 input air temperature sensor ◆ (Sol), the input air humidity sensor (S7), the exhaust temperature sensor (S7),
Reading each detection information of the exhaust humidity sensor (S6) and the fuel meteor sensor (S7), and based on the detection information of the fuel flow rate sensor (S7), the larger the fuel supply amount,
After correcting the detected inlet air humidity so as to increase the value, the difference in absolute humidity of each inlet and exhaust air is determined based on the detected temperature and detected humidity of each large exhaust air.

That is, based on the detection information of the inlet air temperature sensor (Sj), the inlet air temperature sensor (S4), the exhaust temperature sensor (S7), and the exhaust humidity sensor 'J' (S6), A series of processes for determining the difference in absolute humidity includes an input humidity detection stage f (100) for detecting the absolute humidity of inlet air, an exhaust humidity detection means (10k) for detecting the absolute humidity of exhaust air,
and humidity difference calculation means (102) for calculating the humidity difference in the large exhaust air.
) will correspond to the above-mentioned Fuel Meteor Munsa (S7)
Based on the detection end K of The structure is such that the larger the supply amount, the smaller the humidity difference to be determined.

However, the relationship between the detected temperature, the detected humidity, and the absolute temperature is prepared in advance in a table and recorded, and the measured values of the inlet air temperature sensor (S3) and the inlet air humidity sensor (S4), and the Exhaust temperature sensor (S7) and i'i? The corresponding absolute humidity value can be directly determined from each detected value of the exhaust humidity sensor (S6).

Further, the value of 22 degrees, which increases in response to the moisture generated as the burner (12) burns the fuel, is stored in advance as a daple corresponding to the amount of fuel supplied and the humidity of the incoming air. This allows the correction value to be directly determined from the detected fuel supply amount value and humidity value.

Then, the humidity difference corrected according to the fuel supply amount is compared with a reference value set corresponding to the drying speed inputted in advance, and it is determined that the humidity difference is larger than within the set range with respect to the reference value. In this case, it is determined that the drying speed is too fast, and the amount of fuel supplied by the fuel pump (26) is reduced to lower the hot air temperature, and the humidity difference is smaller than the reference value. In this case, it is determined that the drying speed is too close, and the amount of fuel supplied is increased to raise the hot air temperature.

However, when increasing the hot air temperature, the current hot air temperature should be set in advance according to the grain type in order to prevent the grain from overdrying. It is determined whether or not the temperature is below the set temperature, and the hot air temperature is increased only when the temperature is below the set temperature.

If the current hot air temperature exceeds the set temperature, and if the calculated humidity difference and base'<4. If the difference from the W value is within the set range, the hot air temperature is maintained at the current value.

That is, combustion control is started so that the hot air temperature is set corresponding to the inlet air temperature, and the temperature is calculated by the humidity difference calculation means (102) and corrected according to the fuel supply amount. The process of adjusting the amount of fuel t' supplied to the burner (12) based on the difference in the humidity between the input and exhaust boxes,
This corresponds to the combustion control means (103).

Then, it is determined whether or not a set time has elapsed, and each time the set time elapses, the moisture value of the grain detected by the moisture meter (Sl) is read, and the detected moisture value is determined by the finished moisture setting device. In step (24), it is determined whether the finished moisture content is less than or equal to the input moisture content.

If the detected moisture value is below the finished moisture level, determine whether the condition has been detected one or more times in a row or if it is a fortune telling.
Once or more times are repeated, the fuel pump (26) is stopped and combustion in the burner (12) is stopped.

However, after stopping combustion, until the set time has elapsed,
The operation of each motor other than the burner (12) is continued, and after circulating the dryer until the temperature of the drying section (5) drops, each motor is stopped, and the Q! ,
In addition, if the detected moisture value is not below the finishing moisture level and the number of detections below the finishing moisture level is 1.
If not consecutive times, i'iil record tl+
Each subsequent process will be repeated.

[Another example]

In the above embodiment, the fuel supply amount is detected as the fuel flow rate supplied to the burner (12) as the combustion device, but it is also detected as the fuel consumption amount consumed in combustion. The specific configuration of the detection means for supplying fuel can be changed in various ways.

Further, in the above embodiment, the case where the intake air humidity is corrected to a larger value as the supply amount increases in accordance with the fuel supply amount is illustrated, but the intake air humidity may be increased due to cooking or baking. You can correct it to a smaller value by subtracting the humidity corresponding to moisture, or first find the difference between the detected inlet air humidity and 1-1-1' humidity, and then calculate the humidity difference by calculating the humidity difference. The larger the value, the smaller the value may be, and the specific configuration of the humidity difference calculating means (102) can be changed in various ways.

In addition, in the above embodiment, a burner (12) that burns kerosene is used as the combustion device, but the specific type of fuel that generates moisture during combustion and the specific configuration of the combustion device can be changed in various ways. can.

Furthermore, in the above embodiment, the blower for blowing drying air into the drying section (5) is configured as a suction fan (13) that sucks and discharges the drying air discharged from the drying section (5). Although the example is shown, hot air generated by the burner (12) may be blown, or outside air may be forced to be blown to the burner (12), and the specific configuration of the blower device can be modified in various ways.

Furthermore, in the above embodiment, the flow rate of the drying air blown to the drying section (5) is kept constant, and the hot air temperature is controlled based on the difference in absolute humidity of the large exhaust air. The drying speed may be adjusted by controlling both the temperature of the hot air and the amount of air blown, and the specific structure of the combustion control means (103), the absolute humidity of the incoming air Inlet air humidity detection means (100) for detecting the absolute humidity of exhaust air and exhaust air quality detection means (101) for detecting the absolute humidity of exhaust air
The specific configuration of each part, such as the specific configuration of , can be changed in various ways.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the drying speed control device for a circulating grain dryer according to the present invention, in which Fig. 1 is a block diagram of the control configuration, Fig. 2 is a flowchart of control operation, and Fig. 3 is a vertical front view of the dryer. FIG. 4 is a longitudinal sectional side view of the same, and FIG. 5 is a schematic front view of the same. (1)...Grain storage section, (5)...Drying section, (11)...Transportation section, (12)...
...Combustion device, (13)...Blower device, (S7
)...Fuel supply star detection means, (100)...
... Inlet air humidity detection means, (101) ... Exhaust humidity detection means, (102) ... Humidity difference calculation means, (103) ... Combustion control means.

Claims (1)

[Claims] a drying section (5) that heats and dries the grains supplied from the grain storage section (1); and a transport section (11) that returns the grains discharged from the drying section (5) to the grain storage section (1). ,
A blower device (1) blows drying air to the drying section (5).
3), a combustion device (12) that heats the drying air by burning fuel that generates moisture during combustion, and an inlet device that detects the absolute humidity of the air that is introduced into the combustion device (12). An air humidity detecting means (100), an exhaust humidity detecting means (101) for detecting the absolute humidity of the exhaust gas discharged from the drying section (5), and detection information of the inlet air humidity detecting means (100) and the exhaust air humidity humidity difference calculation means (102) for calculating the difference between the inlet air humidity and the exhaust air humidity based on the detection information of the humidity detection means (101);
) Based on the humidity difference determined in the combustion device (1
2) combustion control means (103) for controlling the amount of fuel supplied to
A drying speed control device for a circulating grain dryer, comprising: a fuel supply amount detection means (S_7) for detecting the fuel supply amount of the combustion device (12); 102) is the fuel supply amount detection means (S_
7) A drying speed control device for a circulating grain dryer configured to correct the difference between the inlet air humidity and the exhaust air humidity to a smaller value as the fuel supply amount increases, based on the detected information of 7). .