JP2010145056A - Grain drier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem the when an outside air temperature is low during the cessation of the operation of a grain drier since an ambient temperature around a combustion burner is still high after combustion, dew formation on a frame rod may occur, thus leading to the wrong detection of ignition affected by the dew formation although ignition has not been performed yet when combustion is resumed. <P>SOLUTION: Combustion operation is stopped once during drying operation and the cessation state is continued until a set period has passed or a set time has come. Then, when combustion operation is resumed, after ventilation operation is performed by an air exhaust fan (10), the combustion burner (5) is ignited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grain dryer equipped with a combustion burner.

Patent Document 1 describes a grain dryer that temporarily stops a combustion operation during a drying operation, pauses for a set time, and then restarts the combustion operation to dry to a set moisture value.
JP-A-8-14744

  Usually, the combustion burner of a grain dryer is equipped with a flame rod that detects the presence or absence of combustion (for example, Japanese Patent Laid-Open No. 8-61670), but if the outside air temperature is low during the above-described pause process, Frame rod may condense due to high ambient temperature. Then, it may be erroneously detected that it is ignited due to the dew condensation although it has not yet ignited when resuming combustion.

In order to solve the above problems, the present invention has taken the following technical means.
That is, in the grain dryer provided with the combustion burner (5) for detecting the presence or absence of the combustion flame with the frame rod (33), the combustion operation is temporarily stopped during the drying operation, and the set time is set. Control means (50) for controlling to ignite the combustion burner (5) after the ventilation operation by the exhaust fan (10) is performed when the combustion operation is resumed after the elapse or set time is reached. A grain dryer characterized by being provided.

  The invention according to claim 2 is characterized in that when the outside air temperature is higher than a predetermined value, the combustion burner (5) is ignited without performing the ventilation operation when the combustion operation is restarted. And

  That is, according to the first aspect of the present invention, when the combustion operation is temporarily stopped during the drying operation, the combustion fan is stopped until the set time elapses or the set time is reached, and then the combustion operation is restarted, the exhaust fan (10). By igniting the combustion burner (5) after performing the ventilation operation according to, dew condensation on the flame rod (33) of the combustion burner (5) can be eliminated. It is possible to prevent a false detection that ignition is caused by the influence.

  According to the second aspect of the present invention, when the outside air temperature is high, it is difficult for condensation to occur, so that the combustion operation can be restarted quickly.

Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
Based on FIG. 2 and FIG. 3, the whole structure of the grain dryer K is demonstrated.

  In the box H, there are provided a storage unit 1 for storing the cereal grains stuck and a drying unit 2 below the storage unit 1. On the front side of the box H, an elevator 4, a combustion burner 5, a burner case 6 that covers the combustion burner 5, and an operation panel 7 are provided. A moisture meter 8 is attached to the elevator 4. An exhaust fan 10 is provided on the rear side of the box H.

On the ceiling side of the storage unit 1, there are provided an upper spiral 9 that supplies grains to the storage unit 1 and a diffusion plate 14 that diffuses the grains supplied from the upper spiral 9 into the storage unit 1.
The drying unit 2 includes a hot air chamber 15 through which hot air generated by the combustion burner 5 passes, a downflow passage 16 through which grains flow down, an exhaust air chamber 17 through which exhaust air sucked by the exhaust air fan 10 passes, and a downflow passage. A rotary valve 18 for feeding out 16 grains is provided.

  Below the rotary valve 18, a lower spiral 19 for conveying grain to the elevator 4 is provided. In this embodiment, the grains in the box H are circulated by the action of the rotary valve 18, the lower spiral 19, the elevator 4, and the upper spiral 9, which are collectively referred to as a circulation section.

The structure of the combustion burner 5 is demonstrated based on FIG. 4 and FIG.
30 is a combustion plate, 31 is a vaporizing cylinder for vaporizing liquid fuel, 32 is an igniter for igniting, 33 is a frame rod for detecting a combustion flame, and 34 is a known structure of a burner fan for blowing air to the combustion plate 30. is there. The frame rod 33 is insulated from the combustion disc 30 side by an insulator 35 which is an insulator, and the insulator 35 is supported on the combustion disc 30 side by a metal support 36.

  9 shows an operation panel 40. On the operation panel surface, an operation switch of a tension switch 41, a ventilation switch 42, a drying switch 43, a discharge switch 44, a stop switch 45, a touch panel display screen 46, hot air temperature, moisture, and remaining time are alternately displayed. And a 7-segment display unit 47.

  FIG. 7 is a block diagram, and the control unit 50 includes a flame detection information on the flame rod 33, grain moisture value detection information by the moisture meter 8, detection information from the outside air temperature sensor 21 and outside air humidity sensor 22, the above-described operation switch and touch panel. Various selection / setting information of a drying mode selection switch 51, a drying speed selection switch 52, a grain type selection switch 53, a moisture setting switch 54, and an overhang amount setting switch 55 to be selected on the formula screen 46 is input.

  Further, the control unit 50 outputs the combustion burner 5, the elevator drive motor 4a, the rotary valve drive motor 18a, the exhaust fan motor 10a, the touch panel display screen 46, the 7-segment display unit 47, and the like.

The drying operation of the grain dryer K will be described based on the flowchart of FIG.
When the grain is put into a tension opening (not shown), the grain is raised by the elevator 4, conveyed by the upper spiral 9, and stuck to the storage unit 1 by the diffusion plate 14.

  The operator selects the drying method with the drying mode selection switch 51, selects the drying speed with the drying speed selection switch 52, selects straw or wheat with the grain type selection switch 53, and sets the finishing moisture value with the moisture setting switch 54. Then, the amount of grain stretched by the stretch amount setting switch 55 is set. In the present embodiment, the drying mode selection switch 51 selects the drying mode in which the pause process is inserted during the drying operation, and sets the pause process time to 3 hours. Further, the moisture setting switch 54 sets the finishing moisture value to 14%.

  When the tension operation is finished and the drying switch 43 is pressed, the combustion operation starts. That is, the combustion burner 5 starts operating, and the vaporized fuel is supplied to the combustion disk 30. When the fuel is ignited by the igniter 32, a combustion flame is generated in the combustion disk 30 and the above-mentioned circulation section is operated to It is dried while circulating the cereals.

  The hot air generated by the combustion flame and the suction action of the exhaust fan 10 is supplied to the grains passing through the hot air chamber 15 and flowing down the flow passage 16, removes moisture from the grains, flows into the exhaust air chamber 17, and is discharged. It is discharged out of the machine by the wind fan 10. During the combustion operation, the touch panel display screen 46 displays (A) in FIG.

  The moisture meter 8 detects sample moisture by taking sample grains from the grains that are raised by the elevator 4 every set time. However, when the detected moisture value falls below the set moisture value (for example, 18%), the combustion burner 5 and the circulation path are detected. Is stopped and a pause process is started. The pause process is to pause during drying when there is a large amount of moisture unevenness or variation at the time of stretching work, and to refine the moisture difference at the time of finishing moisture by finishing, and finishing to a good quality dry grain . During the pause process, the display of FIG. 8B is performed.

  When the set time (3 hours) has elapsed in the pause process, the ventilation operation by the exhaust fan 10 is performed for the set time (for example, 5 minutes) prior to resuming the combustion operation, and the frame rod 33 of the combustion burner 5 is condensed. To eliminate this. Thereafter, the combustion burner 5 is ignited, the combustion operation is resumed, and the combustion operation is continued until the finished moisture value (14%) is reached.

  The flame rod 33 is configured to detect the voltage due to the combustion flame current and determine the ignition while monitoring the change in the voltage. However, when the flame rod 33 is dewed, the voltage changes, and the ignition is not actually ignited. There was a case where a false detection was made.

  That is, when a combustion flame is generated from the combustion disc 30, the flame rod 33 and the combustion disc 30 are conducted through the combustion flame, and the voltage of the frame rod 33 is changed to determine that there is a combustion flame. When the frame rod 33 condenses, the frame rod 33 and the support 36 that should have been insulated by the insulator 35 are electrically connected through the water droplets, and the voltage of the frame rod 33 changes to actually ignite. Even if not, it may be determined that there is a combustion flame.

In particular, when the outside air temperature is low or the outside air humidity is high, after the combustion operation is stopped, the ambient temperature around the combustion burner 5 is high, so that the frame rod 33 is likely to condense.
Therefore, it is possible to prevent erroneous detection of the ignition of the combustion burner 5 by igniting the combustion burner 5 by eliminating the condensation of the frame rod 33 by performing the ventilation operation prior to the restart of the combustion operation after the pause process. it can.

  Note that when the outside air temperature detected by the outside air temperature sensor 21 during the pause process is equal to or higher than a predetermined temperature (for example, 25 ° C. or higher), it is difficult for condensation to occur. You may make it perform a quick restart of combustion operation by performing ignition. Alternatively, the above-described ventilation operation may be performed when the outside air humidity detected by the outside air humidity sensor 22 during the pause process is a predetermined value or more.

  Further, in the embodiment of the present invention, the case where the pause is started when the set moisture value (18%) is reached and the combustion operation is automatically restarted after the set time (3 hours) has elapsed is described. The present invention may also be applied to the case where the start of the process and the start of the combustion operation are performed at a set time (for example, the 23:00 pause process is started and the combustion operation is resumed at 6:00 am the next day).

Further, after the above-described ventilation operation is performed, the combustion burner 5 may be stopped when the voltage of the frame rod 33 is detected and abnormality is determined (see FIG. 10B).
As another example of the present embodiment, the voltage of the frame rod 33 is detected at the time of resuming the above-described combustion operation, and if the ignition voltage has been reached before ignition, ventilation is performed until the voltage returns to a voltage that has not been ignited. Then, it may be configured to ignite after returning. Alternatively, the flame rod 33 may be ignited without performing the above-described ventilation operation when the voltage of the frame rod 33 is detected when the combustion operation is restarted and it is detected that the ignition voltage is not reached before ignition.

Next, the case where the combustion burner 5 detects an abnormality will be described.
When the combustion burner 5 detects an abnormality, the fire is extinguished during the combustion (see FIG. 10A), and the case where the ignition is detected before ignition (see FIG. 10B). is there. It is the latter case in the embodiment according to the present invention. When the abnormality of the combustion burner 5 is displayed, it is displayed to inspect the combustion burner 5 as shown in FIG. 11, but when the combustion burner 5 is inspected and the burner is trial run, the combustion start of the inspection screen is started. Touch switch 48. Then, the combustion burner 5 starts combustion and also drives the circulation unit. Conventionally, only the combustion burner 5 was driven at the time of test operation when checking the combustion burner 5, but when only the combustion burner 5 is driven during grain drying, only the grains in the drying section 3 are subjected to a drying action at that time. In some cases, moisture unevenness occurred. Therefore, when the combustion burner 5 is abnormally stopped during grain drying and the combustion operation is performed at the time of inspection, the circulation portion is also driven to prevent moisture unevenness.

  In addition, the trial run at the time of the inspection of the combustion burner 5 when there is no grain makes the circulation path stopped, so that it is not necessary to perform an extra idle operation.

  Although the embodiment of the present invention has been described in the case of a single grain dryer K, each grain is a grain drying facility in which a plurality of grain dryers K are placed in parallel in the building T as shown in FIG. It is preferable to use the control of the present invention in a configuration in which the exhaust air discharged from the exhaust fan 10 of the dryer K is exhausted to the dust collecting chamber 63 by the exhaust duct 62.

  That is, when one grain dryer K is stopped and another grain dryer K is in a combustion operation, one of the exhaust air from the grain dryer K in operation discharged into the dust collecting chamber 63 is discharged. The part flows into the box H through the exhaust duct 62 of the grain dryer K that is not operating. Then, since the exhaust air contains a lot of moisture taken from the grain, when it flows into the resting grain dryer K, the moisture adheres to the frame rod 33 of the combustion burner 5 of the grain dryer K and dew condensation occurs. It becomes easy to do.

  Therefore, in a grain drying facility in which each control unit of a plurality of grain dryers K is connected, when one grain dryer K enters a pause process, any other grain dryer K is in the drying operation. In this case, when the grain dryer K in the pause process resumes the combustion operation, the ventilation fan 10 performs the ventilation operation prior to the ignition of the combustion burner 5 and the frame rod 33 is condensed. By igniting after drying, erroneous detection of ignition can be prevented.

flowchart Diagram explaining the inside of the dryer as seen from the front Diagram explaining the inside of the dryer as seen from the side Side view of combustion burner Diagram explaining the combustion surface of the combustion burner Top view of grain drying equipment Block Diagram Diagram showing touch panel display screen Operation panel Diagram showing touch panel display screen Diagram showing touch panel display screen

Explanation of symbols

5 Combustion burner 10 Exhaust fan 33 Flame rod 50 Control part

Claims (2)

  In a grain dryer equipped with a combustion burner (5) that detects the presence or absence of a combustion flame with a flame rod (33), the combustion operation is temporarily stopped during the drying operation, and is suspended until the set time elapses or the set time is reached. The grain dryer is provided with a control means (50) for controlling the combustion burner (5) to ignite after the ventilation operation by the exhaust fan (10) when the combustion operation is resumed thereafter. .   The grain dryer according to claim 1, wherein when the outside air temperature is higher than a predetermined value, the combustion burner (5) is ignited without performing the ventilation operation when the combustion operation is resumed.

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