JPH08178529A - Burner combustion controller of grain drier - Google Patents

Abstract

PURPOSE: To prevent the hunting from occurring in ON time of a burner in a big flow-rate for a set heating-amount by making difference in the amount of change in the ON time of the burner between the big flow-rate and the middle flow-rate of fuel for a solenoid pump. CONSTITUTION: In a grain drying machine, drying by burning a burner intermittently by the ON/OFF control of the supply of fuel in a given period and whose flow-rate of fuel supplied for the burner is controlled in at least two stages of a big flow-rate and a middle flow-rate, the amount of one change in ON time of the burner for the big flow rate and the middle flow rate is set so that the amount may be small for the big flow-rate, and big for the middle flow-rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner combustion control device for a grain dryer.

[0002]

2. Description of the Related Art Conventionally, in a grain dryer in which a burner is intermittently burned and dried, an average heating amount within a certain cycle is set to a preset heating amount. -The ON time of the switch is controlled to be changed. The change amount at this time is the large flow rate of the electromagnetic pump. Since no distinction was made according to the medium flow rate, hunting was caused due to excessive increase or decrease of the burner ON time at a large flow rate with respect to the set heating amount.

An object of the present invention is to eliminate such problems. To achieve this purpose, the following technical measures were taken.

[0004]

That is, the technical means according to the present invention is to turn on and off the fuel supply within a fixed cycle.
A grain dryer for intermittently burning and drying a burner by F control, in which the fuel supply to the burner is controlled in at least two stages of a large flow rate and a medium flow rate, at a large flow rate. And the amount of change of the burner ON time per medium flow rate is set so as to be small at a large flow rate and large at a medium flow rate.

[0005]

The operation and effect of the invention The grains contained in the storage tank of the grain dryer are fed out from this tank into the drying chamber and circulated. The drying air temperature generated from the burner 5 is set according to the amount of grain infused into the storage tank, the type of grain, the outside air temperature measured by the outside air temperature sensor 39, etc., and the dryer starts and the grains are started. When the drying of the grains is started, the electromagnetic pump 20 which supplies the burning fuel to the burner 5
ON / OFF control is performed at predetermined time intervals, and the burner is turned off.
During the N hours, combustion is performed to generate hot air, and during the OFF time, combustion is stopped and hot air is not generated. In this way, the burner is controlled for intermittent combustion.

During this drying operation, the average heating amount Ks at the previous combustion is compared with the set heating amount K, and when the difference is equal to or less than the constant value, the ON time is changed. Without this, the ON time at the time of this combustion is determined. When the comparison difference is larger than a certain value, it is determined whether the fuel supply to the burner is a large flow rate or a medium flow rate, and when this fuel supply is a large flow rate, the change amount per ON time is changed. Is controlled to be small, and in the case of a medium flow rate, the amount of change per ON time is controlled to be large. In this way, the burner O is adjusted so that the average heating amount Ks within the constant period becomes the set heating amount K.
N time change control is performed.

In short, according to the present invention, the amount of change per change at the time of a large flow rate is small and the amount of change per time at the time of a medium flow rate is large, so that the heating amount with respect to the amount of change per time is increased. By making the changes almost equal, it is possible to eliminate hunting of the burner ON time at a large flow rate with respect to the set heating amount.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A dryer 1 has a storage tank 2, a drying chamber 3 and a grain collecting chamber 4 which are vertically installed from the upper part. Of these, the drying chamber 3 has a hot air chamber 6 having a burner 5 and an exhaust fan 7 having a suction fan 7. Grain downflow passages 9 and 9 are formed between the airflow chambers 8 and hot air is blown onto the grains flowing down by a predetermined amount by the constant rotation of the feeding valves 10 and 10 provided at the lower portions of the downflow passages 9 and 9. It is configured to dry.

The grain elevator 11 has a bucket conveyor 1 inside.
2 is stretched so that the dry grain transferred to one side can be picked up and lifted and conveyed to the upper part by the grain collecting transfer spiral 13 provided laterally at the lower part of the grain collecting chamber 4. This sublimation machine 11
Grains thrown out from the upper part of the above are guided and dropped through a throwing gutter 14 to a starting end portion of a transfer gutter 16 which is provided with a transfer spiral 15. The grain transferred by the transfer spiral 15 is stored in the storage tank 2.
It is configured so that it is guided by a diffusion plate 17 disposed in the upper center part of and is dropped into the storage tank 2.

The moisture sensor 18 is provided at an intermediate portion of the grain raising machine 11, and the moisture motor 19 is rotated by the transmission of an electric measurement signal from the operating device, whereby each portion of the moisture sensor is rotationally driven. The bucket conveyor 12 receives the grains that are falling during conveyance to the upper portion, and while crushing the grains under pressure, the moisture content of the crushed grains is detected. Burner 5
Kerosene in the fuel tank 21 is supplied by driving the electromagnetic pump 20 and is ignited and burned by ignition by energization of the igniter 22. The fuel supply amount by the electromagnetic pump 20 has a large flow rate (large supply,
That is, it is a configuration that can be switched between two stages of high combustion) and medium flow rate (small supply, that is, low combustion). The blower fan 23 is rotationally driven at a variable speed by the blower motor 24 to blow the combustion air commensurate with the supplied fuel to the burner 5.

The combustion system, such as the electromagnetic pump 20, the fuel valve of the electromagnetic pump, and the blower motor 24, is ON / OFF controlled at predetermined time intervals stored and stored, and the burner 5 burns by this ON / OFF control. The burner 5 is stopped and hot air is generated from the burner 5 or stopped. Although the burner 5 has such an intermittent combustion mode, the average hot air temperature during the intermittent combustion cycle period detected by the hot air temperature sensor 25 is compared with the set temperature, and the electromagnetic pump 20 is turned on by the difference. The time is changed and controlled so that the hot air temperature is within a predetermined range of the set temperature. In addition,
In the intermittent combustion time chart of FIG. 5, T: initial combustion time, t: intermittent combustion cycle, ton: intermittent combustion ON time,
toff: Intermittent combustion OFF time, initial combustion time T
Is a continuous combustion for a fixed time, the cycle of the intermittent combustion is constant t (for example, t = 150 seconds), and the ON time can be changed. Further, a high flow rate or medium flow rate supply command signal to the electromagnetic pump 20 is also output to the blower motor 24, and is output to select a preset number of rotations of large and small stages. That is, the required heating temperature is determined by the relationship between the preset temperature and the outside air temperature. When the heating amount is large, the fuel supply is set to a large flow rate, and conversely, when the heating amount is small, the fuel supply is set to the medium flow rate. Therefore, a command is output to the electromagnetic pump 20. Further, delicate temperature control depends on the length of the ON time with respect to the combustion cycle t under each fuel supply state.

FIG. 3 is a control block diagram, in which a controller (CPU) 27 of a controller 26 provided inside the body is provided with a stake-in device provided on a controller panel 28. Dry. Discharge. Stop mode switches 29, 30, 31, 32, setting switches 33, 34, 3 for grain type, amount of swelling, and finished moisture
5. In addition to the input signals of the increase / decrease switches 36 and 37 for setting the drying time, the moisture sensor-18, the frame rod 38, the hot air temperature sensor-25, and the outside air temperature sensor 39
Input various detection signals such as.

On the other hand, as the output signals, there are a drive signal for driving the circulating system such as the motor 40 for driving the grain raising machine and the motor 41 for the feeding valve, a driving signal for the burner 5 and the like. . The burner drive signal is ON-OFF of the electromagnetic pump 20.
There are a signal, a fuel amount supply signal, a rotation speed command signal of the burner blower motor 24, an igniter 22 energization signal, and the like. The above control unit compares the set temperature stored in advance with the average hot air temperature detected by the hot air temperature sensor 25, and periodically turns on the O of the electromagnetic pump 20 to reduce the difference.
The N time is controlled to be changed to long or short.

The grains stored in the storage tank of the grain dryer are fed out from this tank into the drying chamber and circulated. The hot air temperature generated from the burner 5 is set according to the amount of grain inflated into the storage tank, the type of grain, the outside air temperature measured by the outside air temperature sensor 39, etc., and the dryer starts and the grains are started. When the drying of the burner is started, the burner 5
(F) The electromagnetic pump 20 for supplying the fuel for combustion is ON-OFF controlled at predetermined time intervals, the burner burns during the ON time to generate hot air, and the burner pauses during the OFF time to stop the hot air. Does not occur. In this way, the burner is subjected to intermittent combustion control.

During this drying operation, the electromagnetic pump etc. is turned on.
Outside air temperature sensor 3 for every predetermined time within a predetermined time of OFF
9 and the temperature of dry air measured by the hot air temperature sensor 25 and the temperature of the dry air, the heating amount is calculated, and the average value of each heating amount is the average heating during one cycle of burner ON-OFF or during N cycles. The amount Ks is calculated, and the calculated average heating amount Ks and the set heating amount K calculated from the set drying air temperature and the measured outside air temperature are compared, and if they are different, the same as the set heating amount. The ON-OFF time of the electromagnetic pump 20 or the like is controlled to increase or decrease so that the average heating amount Ks and the set heating amount K are the same, and the grain is dried.

In the controller having the structure shown in FIG.
The intermittent combustion as shown in the intermittent combustion time chart of FIG. 5 is performed, and the ON time of the burner 5 is changed so that the average heating amount within a fixed cycle becomes the set heating amount. The change amount per time at this time is distinguished by the large flow rate and the medium flow rate of the electromagnetic pump 20 as in the flow chart shown in FIG. That is, in FIG. 6: in the flow chart, the average heating amount Ks at the previous combustion is compared with the set heating amount K, and when the difference is equal to or less than the constant value, it is turned on. The ON time at this combustion is determined without changing the time. When the comparison difference is larger than a certain value, it is determined whether the fuel supply to the burner is a large flow rate or a medium flow rate, and when this fuel supply is a large flow rate, the change amount per ON time is changed. Is controlled to be small, and in the case of a medium flow rate, the amount of change per ON time is controlled to be large. In this way, the burner O is adjusted so that the average heating amount Ks within the constant period becomes the set heating amount K.
N time change control is performed.

In the embodiment shown in FIG. 7, in the intermittent combustion in which the burner is turned on and off in a constant cycle, the change amount of the burner ON time per change depends on the difference from the set heating amount. It is configured to calculate and change. That is, in the controller having the configuration shown in FIG. 3, the intermittent combustion timechart shown in FIG.
The intermittent combustion is performed as shown in FIG. 9C, and the ON time of the burner 5 is changed so that the average heating amount within a certain cycle becomes the set heating amount. Then, the change amount per time at this time is Δto according to the difference between the two as in the flowchart shown in FIG.
n2: large, Δton1: small. Therefore, the set heating amount can be quickly reached by changing the change amount of the burner ON time per time according to the difference between the set heating amount and the detected average heating amount.

In the embodiment shown in FIG. 8, in the intermittent combustion in which the burner is turned on and off in a constant cycle, the initial combustion time: the burner ON time at the intermittent combustion start after the end of T is A plurality of ON times are distinguished according to the set heating amount. That is, in the controller having the configuration shown in FIG. 3, when the intermittent combustion is performed in the intermittent combustion time chart as shown in FIG. 5 after the initial combustion for a certain period of time, the burner of the first intermittent combustion (FIG. 5) is performed. The ON time (ton) is determined by the flow chart in FIG. Therefore, by setting the ON time according to the set heating amount, the set heating amount can be reached quickly, and stable drying can be performed.

The embodiment shown in FIG. 9 is an intermittent combustion in which the burner is turned on and off in a constant cycle, and the combustion control of the fuel is performed in two stages of a large flow rate and a medium flow rate according to the set heating amount. When
At the time of intermittent combustion start after the end of initial combustion with medium flow rate, when the set heating amount is larger than a certain value, it is on the large flow rate side,
When the value is below a certain value, it is set to the medium flow rate side. That is, in the controller having the configuration shown in FIG. 3, when performing the intermittent combustion in the intermittent combustion time chart as shown in FIG.
At the end of the initial combustion, the set heating amount is obtained from the grain type setting and the temperature adjustment setting (may be performed at the start of drying), and depending on the set heating amount, start at a large flow rate or start at a medium flow rate. This is a configuration for determining whether to execute. Therefore, by starting intermittent combustion at a flow rate according to the set heating amount, the set heating amount can be reached quickly, and stable drying can be performed.

The embodiment shown in FIG. 10 has a constant cycle of bursting.
In the intermittent combustion in which the ON / OFF control of the engine is performed, the burner ON time at the start after the completion of the initial combustion is set to the ON time corresponding to the set heating amount set during the operation, and the intermittent combustion is performed once. Even if the set heating amount is not reached, the ON time is held for a certain number of times. That is, in the controller having the configuration shown in FIG. 3, when the intermittent combustion is performed at the intermittent combustion time chart as shown in FIG. 5, the ON time of the first intermittent combustion is shown in the flowchart of FIG. The ON time calculated from the set heating amount K as shown in (A) is set to this ON time up to N times, and then the ON time is calculated by comparing the calculated average heating amount Ks with the set heating amount K. This is the configuration to be changed.

Therefore, by starting the intermittent combustion at the ON time corresponding to the set heating amount, the set heating amount can be quickly reached, and by keeping the ON time for a certain period of time, It is possible to exclude the influence of the hot air temperature at the initial combustion in the temperature detection during the intermittent combustion (the ON time corresponding to the set heating amount may not be reached due to the hot air at the initial combustion).

[Brief description of drawings]

[Fig.1] Side view of grain dryer

FIG. 2 is a vertical sectional front view of a main part of the same.

FIG. 3 is a control block diagram.

[Fig. 4] Controller panel

[Fig. 5] Intermittent combustion time chart

FIG. 6 Flow chart

[Fig. 7] Flow chart

FIG. 8: Flow chart

FIG. 9: Flow chart

FIG. 10: Flow chart

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dryer 2 Storage tank 3 Drying room 4 Grain collecting room 5 Burner 6 Hot air chamber 7 Suction fan 8 Exhaust air chamber 9 Grain flow path 10 Feeding valve 11 Grain raising machine 12 Bucket conveyor 13 Grain transfer spiral 14 Throwing gutter 15 Transfer Spiral 16 Transfer Gutter 17 Diffusion Board 18 Moisture Sensor-19 Moisture Motor 20 Electromagnetic Pump 21 Fuel Tank 22 Igniter 23 Blower Fan 24 Blower Motor 25 Hot Air Temperature Sensor 26 Controller 27 Controller 28 Controller Panel 29 Suction switch 30 Drying switch 31 Discharge switch 32 Stop switch 33 Grain type setting switch 34 Strain amount setting switch 35 Stop moisture setting switch 36, 37 Increase / decrease switch 38 Frame rod 39 Outside air temperature sensor 40 Grain raising machine motor 41 Feed valve mode
Ta

Claims (1)

[Claims] 1. A grain dryer for intermittently burning and drying a burner by controlling ON / OFF of fuel supply within a fixed cycle, wherein the fuel supply to the burner is at least large and medium flow rates. In the two-stage flow rate control, the change amount of the burner ON time per large flow rate and medium flow rate is set separately so that it is small at large flow rate and large at medium flow rate. Bar of grain dryer characterized by being
Combustion control device.