JPS63306308A - Combustion control system for grain particle drying machine - Google Patents

Abstract

PURPOSE:To stabilize combustion of a burner in a grain particle drying machine for adjusting an amount of drying air by a method wherein if the amount of drying air is to be increased, an amount of combustion air is decreased faster than a desired time and in turn if the amount of air is to be decreased, the amount of combustion air is increased after delay of the desired time. CONSTITUTION:When a moisture sensor 29 detects a high moisture value or when a surrounding atmosphere temperature sensor 36 detects a low surrounding air temperature, the number of rotation of a speed changing motor 14 is increased with its detected signal and then an amount of drying air of an air discharging machine 2 is increased. At this time, the number of rotation of a driving speed changing motor 18 for a combustion air blower 4 is controlled to a low speed rotation set in CPU 42. With this arrangement, the amount of combustion air is decreased. In turn, if an amount of drying air is to be decreased, the amount of combustion air is increased after a delay of the desired time. In this way, the combustion of the burner is stabilized.

Description

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

Conventional technology Conventionally, the hot air generated from the burner and the outside air passing around the 1 The grains flowing down the drying chamber are exposed to this amount of drying air and dried, and the number of rotations of the exhaust fan is changed depending on changes in the moisture value of the grains to be dried, changes in outside temperature, etc. to increase the amount of drying air, or The amount of combustion air supplied to the burner by a blower is controlled to decrease, and regardless of this control, the amount of combustion air is increased or decreased by changing the rotation speed of the blower.

Problems to be Solved by the Invention While removing the circulation in which the grains housed in the dryer are fed out and flowed down inside the drying chamber, the drying air volume is exposed in which the hot air generated from the burner and the outside air passing around the burner are mixed. During this drying process, depending on changes in the moisture content of the grains to be dried and changes in outside air temperature, the rotational speed of the exhaust fan that sucks and exhausts the drying air is changed to increase the amount of drying air. Alternatively, the amount of combustion air supplied to the burner by the blower may be controlled to decrease by changing the rotational speed of the blower to match the amount of fuel supplied to the burner. The burner is controlled to increase or decrease to combust the burner and dry the grains, but if the drying air volume is increased or Due to this, the amount of combustion air may increase, and if this situation occurs, the combustion state of the burner may become too lifted due to the excessive amount of combustion air, resulting in a misfire, or Contrary to the above, if the drying air volume is controlled to decrease, the amount of combustion air may decrease due to the effect of this control on suction and exhaust air from the low-speed rotation of the exhaust fan, and if this situation occurs, the burner will 7. Due to insufficient amount of combustion air. This burner sometimes caused red-flame combustion and produced a lot of carbon.

Means for Solving the Problems This invention uses dry air, which is a mixture of hot air generated from a burner (1) and outside air passing around this burner (1) while grains are flowing down, to be discharged air a (2). ) is provided with a drying chamber (3) for drying by suction ventilation; 4) In the dryer that changes the rotation speed, when the drying air volume is controlled to increase, the combustion air volume supplied to the burner (1) is controlled to decrease by a predetermined amount earlier than this control by a predetermined time, and the above is different. Conversely, when the drying air volume is controlled to be reduced, an air volume control device is provided to increase the combustion air volume supplied to the burner (1) by a predetermined amount later than this control by a predetermined time. The structure is as follows.

Effect of the Invention While repeating the circulation in which grains are fed out and flowed down inside the drying chamber (3), hot air generated from the burner (1) and this burner (
1) The drying air mixed with the outside air passing through the surrounding area is sucked and exhausted by the exhaust fan (2), and the amount of drying air is exposed and dried. Depending on changes in the moisture content of grains during drying and changes in outside air temperature, the rotational speed of the 4ft (2) exhaust air is changed to increase or decrease the drying air volume. Sometimes, the rotation speed of the blower (4) that supplies combustion air to the burner (1) is changed to a predetermined low speed rotation a predetermined time earlier than this increase control, and the amount of combustion air supplied by the blower (4) is increased. The burner (1) is controlled to decrease by a predetermined amount.
burns.

Contrary to the above, when the drying air volume is controlled to be reduced, the rotational speed of the blower (4) that supplies combustion air to the burner (1) is changed to a predetermined high speed rotation for a predetermined time later than the reduction control. , this ventilation I! In step (4), the amount of combustion air supplied is controlled to increase by a predetermined amount to cause combustion in the burner (1).

Effects of the Invention According to the present invention, when the drying air volume is controlled to increase or decrease due to changes in the moisture value of grains, changes in outside temperature, etc. during drying work, the amount of combustion air supplied to the burner (1) is controlled by this control. control the increase or decrease of
By slowing down, the combustion of the burner (1) is less influenced by the dry R amount control, and therefore the burner (1) performs stable combustion.

Embodiment In the illustrated example, the machine wall (6) of the dryer (5) has a rectangular shape that is long in the front-rear direction in plan view, and is made up of front and rear wall plates and left and right wall plates, and this front wall plate is equipped with a burner (1). A burner case (7) containing a 6) A grain collection gutter (9) equipped with a transfer spiral is provided in the center of the lower part, and a drying chamber (3) with a feeding valve (10) pivoted on the lower part is installed above the grain collection gutter (9).
) are arranged in parallel and communicated with each other, and a hot air chamber (11) is formed between the insides of the drying chambers (3) and (3), and communicated with the burner (1). is a hot air temperature sensor (
12), and an air exhaust chamber (13) is formed outside the drying chamber (3), (3) and communicates with the air exhaust fan (2). Motor (14) and motor (1
5), and the variable speed motor (14) is used to generate the exhaust air Ia (
2), and the motor (15) rotates the transfer spiral, the delivery nozzle (lO), (10), etc.

A fuel pump (16) having a fuel nozzle is provided on the outer side of the lower plate of the burner case (7), and by opening and closing the fuel nozzle, the fuel pump (1G) is used to open the fuel tank (17).
The structure is such that fuel is sucked in from the burner and supplied into the burner (1), and a blower (4) and a variable speed motor (18) are installed on the outside of the upper plate.
), the blower It (4) is rotationally driven by the rotation of the variable speed motor (18), and combustion air is supplied from the blower (4) into the burner (1). The amount of air supplied is commensurate with the amount of fuel supplied from the fuel pump (tS), and the hot air generated from this burner (1) and the outside air passing around this burner (1) are combined. is sucked in by the exhaust air It (2), resulting in a drying air volume.

A storage chamber (13) is formed above the drying chambers (3), (3), and a ceiling plate (20) is formed above the storage chamber (18).
(20) and a transfer gutter (21) equipped with a transfer spiral; a supply port for supplying transferred grains into the storage chamber (19) is provided in the center of the transfer gutter (21); It has a configuration in which a diffusion plate (22) is provided on the lower side, and the storage chamber (1
'l2 (23) is provided on the front wall plate forming 8),
On the side of this window (23), a numerical value indicating the amount of stored grain is provided.

A grain raising machine (20) is installed in the front part of the front wall plate, and a packet conveyor (25) belt is stretched between the upper and lower pulleys inside, and a grain hoist (20) is installed between the upper end and the starting end of the transfer gutter (21). A dispensing tube (2B) is provided and communicated with the lower end and the grain collection gutter (9).
A supply gutter (27) is provided to communicate with the terminal end, and a motor (28) is provided on the upper part of this grain hoisting II (24), and this motor (2B) operates the bucket conveyor (25) belt, the The transfer spiral and the spreader plate (2) in the transfer gutter (21)
2), etc., and a moisture sensor (28) is provided at the vertical center, and this moisture sensor (29) detects grains that fall while being conveyed to the upper part of the packet conveyor (25). It is configured to receive grains, crush the grains under pressure, and at the same time detect the moisture value of the crushed grains.
The moisture sensor (28) rotates a motor (30) provided in the moisture sensor (29) by transmitting an electrical measurement signal from the operating device (8) at predetermined time intervals. ) is configured to rotate each part of the moisture sensor (23) to detect the moisture value of the grain.

The operating device (8) is box-shaped, and the surface plate of the box includes a start switch (31) for starting and stopping the dryer (5), a stop switch (32), and grains. a target moisture setting hole (33) for setting the finishing moisture value of the water, a hot air temperature setting hole (34) for setting the hot air temperature, and a detection value detected by the hot air temperature sensor (12) and the moisture sensor (28). A display window (35) is provided to display the
There is an outside temperature sensor (3) on the outside of the lower plate that detects the outside temperature.
6), and a control device (37) and an air volume control device (38) are provided inside, and each setting setting (33)
, (30 is a rotary switch type, and this setting switch (33) is operated to the position of the numerical value displayed on the surface plate to set the finishing moisture value, and this setting switch (34) is set in the storage chamber (1B). ) The temperature of the hot air generated from the burner (1) is set when the numerical value displayed on the grains stored in the burner (1) is moved to the same position as the numerical value displayed on the surface plate.

The air volume control device 1 (38) includes the moisture sensor (28).
And the detection value detected by the outside air temperature sensor (36) is A
- an A-D converter (39) that performs D conversion; an input circuit (40) into which the converted value converted by this A-D converter (39) is input; and an input circuit (40) into which the operation of the setting circuit (33) is input input circuit (41), each of these input circuits (40), (41
), a CPU (42) performs arithmetic and logical operations, comparison operations, etc. on various input values input from the CPtJ (42), and an output circuit (43) receives and outputs various commands from the CPtJ (42).
).

The control device (37) is connected to the hot air temperature sensor (12).
An A-D converter to which a detected value detected by the A-D converter is A-D converted, an input circuit into which the converted value converted by this A-D converter is input, each of the switches (31) and (32), and the setting. An input circuit into which the operation of the cursor (34) is input, the CPU (42) which performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits, and this CPU (42).
This configuration includes an output circuit that receives and outputs various commands from the controller.

Said control device! When the operation of the start switch (31) and the setting spreader (34) is input to (3?), and the operation of the setting knob (33) is input to the M amount control bag ffl (38), At the same time when the dryer (5) starts, the burner (1), the exhaust fan (2), and the air blower 41
! (4) and the moisture sensor (29) is started to dry the grains, and during this drying operation, for example, if the moisture sensor (28) detects a grain moisture value of 25% or higher, When the external temperature sensor (36) detects a low external temperature of 5 degrees Celsius or less and inputs the input, the variable speed motor (14) is controlled to the high speed rotation set and stored in the CPU (t2). Then, the standard rotational speed of the exhaust air Wt(2) of 2600rspem is changed to 3000r*p*m rotation, and the drying air volume is controlled to increase as shown in FIG. 1A. (42) 10 seconds before the setting and memorization, the variable speed motor (18) that rotationally drives the blower (4) that supplies combustion air into the burner (1) is transferred to the CPU (42). Control the blower (4) to the low speed rotation that has been set and memorized, change the standard rotation speed of 3600 repSill to 3200 r·P@m rotation, and reduce the combustion air end as shown in Figure 1A. Contrary to the above, when the moisture sensor (23) detects and inputs a grain moisture value with a low moisture value of 17% or less, and when the outside air temperature sensor (36) detects and inputs a grain moisture value with a high outside temperature of 30 degrees Celsius or higher, - is detected and input, the corresponding speed change motor (1
4) is controlled to the low speed rotation set and stored in the CPU (42), and the standard rotation of the exhaust fan (2) is 2600r@p.
am was changed to 2200 repem rotations, and the drying air volume was controlled to decrease as shown in Fig. 1 B. During this decrease control, the CPU (42) was set and memorized 1.
After 0 seconds, the variable speed motor (18) that rotationally drives the blower (4) that supplies combustion air into the burner (1) is controlled to the high speed rotation set and stored in the CPU (42). 41 (4) (7) Standard rotation 3soor”
The pφm is changed to 4000r*pem rotation, and the amount of combustion air is controlled to increase, as shown in Fig. 1B.In addition to the above, the exhaust fan (2) sucks and exhausts dry air.
Rotates at the standard rotation speed of 260 Or-p・m,
The blower has a standard drying air volume and also supplies combustion air (
The rotation speed of 4) is a standard rotation speed of 360 Or@p·m, and the configuration is such that the standard combustion air flow is controlled by the air volume control device (38).

When the moisture sensor (28) detects a grain moisture value that is the same as the grain moisture value set by operating the setting knob (33), the air volume control device (3 days) automatically controls the dryer. (5) is configured to automatically stop, and the detected hot air temperature detected by the hot air temperature sensor (12) is compared with the set hot air temperature set by operating the setting knob (34), and if there is a difference, the detected hot air temperature is compared. The control device (37) changes the number of times the fuel valve is opened and closed so that the hot air temperature becomes the same as the set hot air temperature, and controls the fuel pump (16) to suck in fuel and supply it to the burner (1). ), the dryer (5) is started by operating the setting knobs (33) and (34) of the operating device (8) to predetermined positions and operating the start switch (31). At the same time, the burner (1) and the moisture sensor (29) are started, and the hot air generated from the burner (1) and the outside air passing around the eight-table (1) mix to become dry air. The wind is hot air room (11
), the drying room (3) is ventilated, the grains are suctioned and exhausted by the exhaust fan (2) through the ventilation room (13), and stored in the storage room (19). While flowing down inside the drying chamber (3), it is exposed to this drying air volume and dried, and the delivery valve (1)
0) to the lower part and flow down to be supplied into the grain collection gutter (9), and from this grain collection gutter (9) via the supply gutter (27), it is transferred into the grain hoisting machine (24) by a spiral. It is transported to the upper part by a bucket conveyor (25) and supplied into a transfer gutter (21) through a dispensing tube (26), and from this transfer gutter (21), it is transferred and supplied onto a spreading plate (22) in a spiral manner. , is uniformly diffused and returned into the storage chamber (19) by this diffusion plate (22), is circulated and dried, and the finished moisture value is set by the moisture sensor (28) by operating the setting sensor (33). When the same grain moisture value is detected, the air volume control device (3) of the operating device (8)
8), the dryer (5) is automatically stopped under automatic control.

During this drying work, when the detected moisture value detected by the moisture sensor (29) is a high moisture value and when the detected outside air temperature detected by the outside air temperature sensor (36) is low outside air temperature, the exhaust fan (2 ) to increase the amount of drying air sucked and discharged, and when this increase control is performed, the amount of combustion air supplied to the burner (1) is decreased by a predetermined time earlier than this control, and this burner (1) starts combustion. do. Contrary to the above, when the detected moisture value detected by the moisture sensor (23) is a low moisture value and when the detected outdoor temperature detected by the outdoor temperature sensor (36) is a high outdoor temperature, the exhaust air a In step (2), the amount of drying air sucked and discharged is controlled to be reduced, and when this reduction control is performed, the amount of combustion air supplied to the burner (1) is controlled to be increased a predetermined time later than this control, and the amount of combustion air supplied to the burner (1) is controlled to increase. burns.

When controlling the drying air I4 to increase or decrease during drying work, increase or decrease the amount of combustion air supplied to the burner (1) by increasing or decreasing the control by a predetermined period of time.
Or by controlling the decrease, the combustion state of this burner (1) is stabilized.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Figure 1 is a diagram showing the relationship between drying air volume and combustion air volume, fifJZ diagram is a block diagram,
Figure 3 is a flowchart diagram, Figure 4 is an overall front view of the dryer partially cut away, Figure 5 is an overall side view of the dryer partially cut away, Figure 6 is a rear view of the dryer, and Figure i7 is an overall front view of the dryer partially cut away. It is an enlarged front view of a part of a dryer. In the figure, reference numeral (1) indicates a burner, (2) an exhaust fan, (3) a drying chamber, and (4) a blower.

Claims (1)

[Claims] A drying room (drying room) in which grains are dried by suction and ventilation using an exhaust fan (2), which is a mixture of hot air generated from a burner (1) and outside air passing around this burner (1) while the grains are flowing down.
3), and the drying air volume is controlled by varying the rotation of the exhaust fan (2), and the rotation speed of the blower (4) for supplying combustion air to the burner (1) is changed. , when the drying air volume is controlled to increase, the combustion air volume supplied to the burner (1) is controlled to be decreased by a predetermined amount earlier than this control by a predetermined time, and contrary to the above, when the drying air volume is controlled to decrease, this control is performed. A combustion control method characterized in that an air volume control device is provided to increase the amount of combustion air supplied to the burner (1) by a predetermined amount later than the control by a predetermined time.