JPH0453472A - Method for preventing explosion of combustion device in laver dryer - Google Patents

Abstract

PURPOSE:To prevent explosion of a combustion device and the inside of a combustion cylinder, prevent breakage of equipment and dry laver in safe operation by discharging a vaporized fuel remaining in the combustion cylinder before ignition of the combustion device by a fan and igniting the device. CONSTITUTION:A fan 23 is installed together with an ignition device 21, pump 24 for fuel supply, etc., in a combustion device 2 of drying chamber 10 and vaporized fuel remaining in the combustion device 2 and combustion cylinder 12 is discharged from a chimney 13 by operating the fan 23, preferably for 5-15sec before ignition. Thereby drying temperature is controlled and laver on a laver-carrying conveyer 11 is dried.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for preventing explosion of a combustion device in a seaweed dryer.

[Prior art and its issues]

A seaweed dryer is used to produce dried seaweed. FIG. 4 is a schematic diagram of a conventional seaweed dryer. In the figure 1
0 is a drying chamber of a seaweed dryer 1, in which a seaweed cage conveyor 11 and a combustion cylinder 12 formed in an "L" shape are arranged. A chimney 13 is provided at the tip of the rising portion of the combustion tube 12. A blower fan 14 for blowing hot air is arranged below the horizontal portion of the combustion tube 12. 2 is a combustion device using an oil burner, 20 is a combustion chamber,
21 is an ignition device, 22 is a spark plug, 23 is a blower fan, 24 is a fuel supply pump, and 25 is a fuel injection nozzle. Figure 5(a) is an electrical circuit diagram of a conventional combustion device;
b) is the time chart. In Fig. 5(a), there is always an AC current between terminals Pi and P2.
, 100/110V or 200/220V, and an ignition device 21, a blower fan 23, and a fuel supply pump 24 are connected in parallel between the terminals PI and P2. Terminal P1, igniter 21, blower fan 23,
A control switch SW is connected in series between the fuel supply pumps 24. The control switch SW is activated by an automatic control signal, and can be set to ``one person'' or ``off''(``combustion'' or ``off'' of the combustion device).
"Extinguishing") is repeated to control the temperature inside the drying chamber 10. In this circuit, when the control switch SW is set to "man", the ignition device 21, the ventilation fan 23, the fuel supply pump 24
"One person works at the same time" and the combustion device starts combustion. By the way, when the control switch SW is turned off, the ignition device 21, the blower fan 23, and the fuel supply pump 24 simultaneously stop operating or are turned off, or between the fuel supply pump 24 and the fuel injection nozzle 25. The remaining fuel is in the combustion chamber 2.
There may be cases where this fuel is present in a vaporized state due to the heat of the combustion tube 12. (Hereinafter, the combustion tube 12 refers to the one including the combustion chamber 20.) In such a case, the membrane flow condition of the chimney 13 (for example, if the height of the chimney is low or there is a problem with the bent part, or even if the outside (wind blowing condition, etc.), combustion tube 1
There is a risk that vaporized fuel may remain in the combustion tube 12 due to the membrane flow condition (for example, a defect in the bent part) in 2, and the remaining vaporized fuel may ignite during reignition, causing the combustion tube 12 to explode. There was sex.

[Purpose of the invention]

Therefore, an object of the present invention is to prevent explosion of the combustion tube by activating a blower fan to make the combustion tube into a state where no vaporized fuel is present, and then re-igniting the combustion tube.

[Structure of the invention]

The configuration of the invention requested to achieve the above object is as follows. That is, the present invention provides a method for drying seaweed in the drying chamber by disposing a combustion tube in the drying chamber and sending hot air of combustion gas from a combustion device using petroleum as fuel into the combustion tube, comprising the following steps: During the second and subsequent combustion operations, the blower fan is operated after the fire is extinguished or before the ignition, or after the fire is extinguished and before the ignition, to expel the vaporized fuel from the combustion cylinder, and then the ignition is performed. This is a method for preventing explosions in the combustion equipment of seaweed dryers. The blower fan is operated after extinguishing the combustion device or before igniting the combustion device to expel the vaporized fuel remaining in the combustion tube from the combustion tube. In addition, in order to completely expel the vaporized fuel, the blower fan may be operated twice, once after extinguishing the combustion device and before igniting it.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. FIG. 1(a) is an electric circuit diagram of a combustion device according to the first embodiment, and FIG. 1(b) is a time chart thereof. An ignition device 21, a blower fan 23,
A fuel supply pump 24 and a timer 26 are connected in parallel. A control switch SW is connected between these and terminal P1.
are connected in series. Furthermore, the connection point P3 of the ventilation fan 23 and the connection point P4 of the fuel supply pump 24 are connected to the timer 2.
It is connected through the time-limited a contact 260 of 6. The action control switch SW has the function of turning on when the temperature is below a set temperature and turning off when the temperature is higher than the set temperature using a temperature regulator or the like. Drying room! If the temperature inside 0 becomes lower than the preset temperature, the control switch SW becomes "human" and the blower fan 2
3 is activated and at the same time the timer 26 is also activated. While the timer 26 is operating for a certain period of time (for example, 5 to 15 seconds), the vaporized fuel remaining in the combustion tube 12 is discharged into the atmosphere through the chimney 13 by the blower fan 23. After a certain period of time has elapsed, the time-limited a contact 260 becomes active, the ignition device 21 and the fuel supply pump 24 are activated, the ignition is ignited, and the combustion device 2 starts combustion. If the temperature rises too high, the control switch SW is turned off, and the ignition device 21,
The blower fan 23, fuel supply pump 24, and timer 26 are simultaneously stopped and turned off. The temperature inside the drying chamber "0" is controlled by repeating the above-mentioned operations. FIG. 2(a) is an electric circuit diagram of a combustion device according to a second embodiment, and FIG. 2(b) is a time chart thereof. The first embodiment differs in that the timer B contact 26b is arranged between the connection points P3 and 24, and the timer time-limiting contact 261 and the A contact 26a are arranged in series between the connection points P5 and 26. They are different in that they are 30 is a control switch;
1, its a contact 32 is also a b contact. The action control switch 30 has the function of connecting to the a contact 31 when the temperature falls below a set temperature using a temperature regulator or the like, and connecting to the b contact 32 when the temperature rises above the set temperature. When the temperature inside the drying chamber 10 becomes lower than the preset temperature, the control switch 30 connects with the a contact 31, and the blower fan 23, ignition device 21, and fuel supply pump 24 are activated and ignited. Then, the combustion device 2 starts combustion. When the temperature inside the drying chamber 10 becomes higher than the set temperature, the control switch 30 is activated and connected to the b contact 32, and at the same time, the timer 26 is activated. Simultaneously with the operation of the timer 26, the timer's a contact 26a becomes [human], and the timer's b contact 26b becomes [
The ignition device 21 and fuel supply pump 24 stop operating and are turned off. During the time set by the timer 26, the vaporized fuel remaining in the combustion tube 12 is discharged into the atmosphere through the chimney 13 by the blower fan 23. After the set time has elapsed, the timing contact 261 of the timer 26 turns off, and the blower fan 23 stops. The temperature inside the drying chamber 10 is controlled by repeating these operations. FIG. 3(a) is an electric circuit diagram of a combustion device according to a third embodiment, and FIG. 3(b) is a time chart thereof. This embodiment differs from the first and second embodiments in that the a contact 26a of the timer 26 is disposed between the connection points P3 and 27. The action control switch 30 has the function of connecting to the a contact 31 when the temperature falls below a set temperature using a temperature regulator or the like, and connecting to the b contact 32 when the temperature rises above the set temperature. When the temperature inside the drying chamber 10 becomes lower than a preset temperature, the control switch 30 connects with the a contact 31. This activates the timer 26. Simultaneously with the operation of the timer 26, the a contact 26a of the timer 26 becomes "active", and the blower fan 23 is activated. After the set time of the timer 26 has elapsed, the time-limited a contact 2 of the timer 26
60 becomes [man], the ignition device 21 and fuel supply pump 24 are activated and ignited, and the combustion device 2 starts combustion. Note that the second timer 27 is not operating at this time. When the temperature inside the drying chamber 10 becomes higher than the set temperature, the control switch 30 is activated and connected to the b contact 32. timer 2
6 stops, the a contact 26a of the timer 26 is turned off.
Then, the ignition device 21 and the fuel supply pump 24 stop operating and are turned off, stopping combustion. At the same time, the second timer 2
7 is activated, the a contact 27a of the timer 27 becomes active, and the blower fan 23 continues to operate in the "active" state. Second timer 2
After the set time of 7 has elapsed, the timing contact 27b of the timer 27 becomes [
OFF], and the blower fan 23 stops operating. Note that the timer 26 is not operating at this time. The temperature inside the drying chamber 10 is controlled by repeating the above operations. The invention is not limited to the illustrated embodiment, but can be modified in many ways within the scope of the claims.

【Effect of the invention】

According to the present invention, the first combustion working diameter of the combustion device is
For subsequent combustion operations, a blower fan is operated after the fire is extinguished or before the fire is ignited, or after the fire is extinguished and before the fire is ignited, the vaporized fuel is expelled from the combustion cylinder into the atmosphere through the chimney, and then the fire is ignited. Therefore, it is possible to prevent explosions of the combustion device, combustion cylinder, etc., to prevent the destruction and scattering of these devices, and to ensure the safety of seaweed manufacturing workers.

[Brief explanation of drawings]

FIG. 1(a) is an electric circuit diagram of a combustion device according to a first embodiment of the present invention, and FIG. 1(b) is a time chart thereof. FIG. 2(a) is an electric circuit diagram of a combustion device according to a second embodiment of the present invention, and FIG. 2(b) is a time chart thereof. FIG. 3(a) is an electric circuit diagram of a combustion device according to a third embodiment of the present invention, and FIG. 3(b) is a time chart thereof. Figure 4 is a schematic diagram of a conventional seaweed dryer, Figure 5 (a) is an electric circuit diagram of a conventional combustion device, and Figure 5 (
b) is the time chart. 10: Drying chamber 12: Combustion tube 14, blower fan 20: Combustion device patent application filed by Katsuhiko Kajiwara, patent attorney Togami Electric Seisakusho Co., Ltd. Figure 1 CO) Figure 1 (b) Figure 2 (σ)

Claims (1)

[Scope of Claims] 1. A combustion device in which a combustion tube is arranged in a drying chamber, and hot air of combustion gas is sent into the combustion tube from a combustion device using oil as fuel to dry the seaweed in the drying chamber. After the first combustion operation and after the second combustion operation, after extinguishing the fire or before ignition, the blower fan is operated to expel the vaporized fuel from the combustion cylinder, and then ignition is performed. A method for preventing explosion of a combustion device in a seaweed dryer, characterized by: 2. A combustion tube is arranged in a drying chamber, and hot air of combustion gas is sent into the combustion tube from a combustion device using oil as fuel to dry the seaweed in the drying chamber, the first combustion of the combustion device. Combustion in a seaweed dryer characterized in that during the second and subsequent combustion operations after activation, a blower fan is operated after extinguishing and before ignition to expel vaporized fuel from the combustion cylinder, and then ignition is performed. How to prevent equipment from exploding.