JPS61246521A - Burner control device - Google Patents

Abstract

PURPOSE:To provide a burner control device which prevents repeated flame failure at the start time of re-burning by starting re-burning with smaller air quantity than burning air quantity at normal burning time after flame failure of a burner. CONSTITUTION:A CPU42 controls fuel quantity supplied by a fuel pump 2 and also rotation of a blower which supplies air quantity corresponding to burning quantity after temp. of hot wind is found out by hot wind detecting sensor 29. When a flame failure takes place within a specified time from the start time of burning memorized in the CPU42, a flame=detecting sensor 5 finds out the fire extinction and at the time of restart of burning after detection, re-burning is performed in such a manner that smaller burning air quantity than burning air quantity corresponding to normal burning fuel quantity memorized in the CPU is supplied by controlled rotation of a motor 30 of the blower. Thus, as burning, air quantity is reduced by control of the blower, repeated flame failure does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a burner control device, and can be used in a dryer for drying grain.

Conventional technology Conventionally, in accordance with the amount of fuel supplied into the burner by a fuel pump, the amount of combustion air is blown by a blower to cause combustion in the combustion section of the burner, and when combustion misfires at the beginning of combustion and re-combustion starts. However, it was a device that could blow a combustion air volume that was appropriate for the amount of fuel supplied without reducing the combustion air volume.

Problems to be Solved by the Invention When a burner is used in a dryer for drying grains, a combustion part of the burner installed at the front of the dryer burns fuel while spouting it toward the front. By sucking the flame with the exhaust fan installed at the rear of the dryer, the drying chamber is circulated as hot air, and the grains flowing down the drying chamber are exposed to this hot air and dried. By setting the temperature of the hot air generated by the burner, the amount of fuel supplied to the burner by the fuel pump is controlled so as to reach the set hot air temperature, and the blower controls the amount of combustion air that corresponds to this amount of fuel. However, when this combustion starts, if there are minute air bubbles in the fuel, or if there is dust etc. in the fuel supply line, the set fuel amount may not be enough for the burner. In such a situation, the amount of combustion air blown by the blower may become excessive, causing the burner to misfire, and even if it starts reburning, it may not cause another misfire. There was a repeat.

Means for Solving the Problems This invention provides a fuel pump (2) that supplies fuel into a burner (1) that burns while jetting fuel forward, and controls the amount of fuel supplied by this fuel pump (2). A blower (3) is provided to blow an appropriate amount of combustion air into the burner (1), and a flame detection sensor (5) is provided to detect combustion flame ejected from the combustion section (4) of the burner (1). A burner control device comprising an air volume control device that controls the combustion air volume to be reduced to a smaller air volume than the combustion air volume during combustion when the flame detection sensor (5) detects a misfire within a predetermined time from the start of combustion and then starts re-combustion. The structure is as follows.

Functions and Effects of the Invention The fuel supplied from the fuel pump (2) and the amount of combustion air adapted to the amount of fuel are blown by the blower (3) and supplied into the burner (1). 1) Combustion part (
4) The fuel is ejected and combusted while being ejected forward, and the combustion flame is detected by the flame detection sensor (5) and burned, and the combustion flame and the outside air passing around the burner (1) are used to burn the fuel. This drying hot air dries the grains, but within a predetermined time from the start of combustion, the combustion flame ejected from the burner (1) misfires, and this misfire is detected by the flame detection sensor (5). is detected, and when the next combustion starts after the detection, the air volume is controlled so that the set combustion air volume stored in the operating device is reduced from the combustion air volume that is adapted to the amount of fuel supplied from the fuel pump (2). The device decelerates the rotation of the blower (3) to reduce the amount of combustion air blown into the burner (1) for combustion.

According to the present invention, when combustion starts in the combustion section (4) of the burner (1) and misfires within a predetermined time, and when combustion starts again after the misfire, the blower (3) The combustion air volume blown to the burner (1
), the burner (1) burns in a stable state without repeating misfires due to an excessive amount of combustion air.

Embodiment In the illustrated example, a burner case (8) is provided on the front wall plate of the machine wall (7) of the dryer (6).
A burner (1) is installed inside the dryer (8), and an operating device (9) for controlling the start, stop, etc. of this dryer (7).
An exhaust fan (10) is installed on the rear wall plate, and the air exhaust fan (10) is installed on the rear wall plate.
7) A storage chamber (11) is provided in the upper part, a drying chamber (12) is provided in the lower part, and a pay-out roll (13) is provided at the bottom of this drying room (12) for feeding out and flowing down the grains. 13) A grain collection transfer gutter (14) is provided in the lower part, and a transfer gutter (15) is provided in the upper part of the storage chamber (11).

The front part of the machine wall (7) is equipped with a 4m grain hoist (1B) and a fuel tank (17).

The burner (1) has a combustion part (4) in the front part, and is mounted on a support plate (45) fixed to the bottom wall plate part of the burner case (8). The generated hot air and the outside air passing around the burner (1) are sucked by the exhaust fan (10) to become drying hot air, and this drying hot air is passed through the drying chamber (12), and the drying Room (1
2) The grains flowing down inside are exposed to this drying hot air and dried.

The burner (1) has a cylindrical ventilation chamber (18) with an open center that blows combustion air to the rear part of the burner (1).
18) is provided with a motor (20) for rotationally driving the vaporizing cylinder (1B) and the like. A combustion cylinder (21) with an open center is fixed to the front part of the ventilation chamber (18), and a conical guide cylinder (22) with an open tip is fixed to this opening. 22) The outer periphery has a passage through which the vaporized fuel passes, and the combustion tube (21) further includes a combustion plate (23) having a nozzle opening in the center and through which the vaporized fuel is ejected and burned.
), and an ignition heater (24) for igniting the fuel and a flame detection sensor (5) for detecting the presence or absence of combustion flame are also fixed near the outer periphery.

A scattering body (26) for receiving and rotating fuel supplied from a fuel nozzle (25) and the vaporizing tube (18) along the guide tube (22) are fixed to the shaft end of the motor (20),
This carburetor cylinder (19) has a tip-like shape with a mouth edge bent toward the outer periphery, and a carburetor disc (27) is fixed to the mouth edge with a small gap through which fuel can flow out. This vaporizer (27
) has its front edge side diagonally expanded forward and outward, and the carburetor cylinder (19
) is formed into a conical shape in the direction opposite to that of the combustion disk (23), and a jet nozzle (2B) is formed between this enlarged diameter portion and the inclined portion of the combustion disk (23), and this jet nozzle (28) and the combustion disk The structure is such that vaporized fuel is ejected from the ejection hole (23) and combusted.

A blower (3) and a blower motor (30) are provided on the outer side of the upper wall plate of the burner case (8), and an air intake port (3) projects from the blower (3) into the burner case (8).
1), the air intake port (31) and the blower (3) communicate with each other, and a blower duct (32) is provided between the blower (3) and the opening of the blower chamber (18), Intake port (31
) is blown into the ventilation chamber (18) through the blower (3) and the ventilation duct (32).

A fuel pump (2) is installed outside the lower wall plate of the burner case (8).
), and a fuel hose (3) is provided from the fuel tank (17).
3), the fuel pump (2), the fuel supply pipe (+4),
The fuel passes through the fuel nozzle (25) and flows into the flying object (26).
) is configured to be supplied to the outer periphery.

The operating device (9) is box-shaped, and has a start switch (35), a stop switch (3B), a hot air temperature setting hole (37), various holes (38), etc. on the surface, and inside. The configuration includes an air volume control device (38), and the air volume control device (38) is an input to which the operations of the switches (35), (3B) and the setting knobs (37), (38) are input. A circuit (40), in which the detected values of the flame detection sensor (5) and the hot air temperature detection sensor (28) are converted from A to D;
-D converter (41), an input circuit (40) into which the converted value converted by the A-D converter (41) is input, and various inputs from these input circuits (40), (40). A CPU (42) that calculates input values and performs logical operations and comparison operations.
) and an output circuit (43) that receives and outputs various fingers 4 commanded by this CPU (42),
This air volume control device (38) controls the fuel pump (2), the ignition heater (24), the motor (20), the blower motor (30), the grain hoist (1B), and the feed roll (13). The configuration is such that a motor (40, etc.) that rotationally drives the components is started, stopped, and controlled.

The CPU (42) controls the amount of fuel supplied to the burner (1) by the fuel pump (2) so that the hot air temperature is set by the hot air temperature setting adjustment (37). The hot air temperature is controlled by the hot air temperature detection sensor (2).
8) detects and compares the hot air temperature with the set hot air temperature and controls the fuel pump (2) so that the hot air temperature does not differ from the set hot air temperature, and at the same time controls the rotation of the blower (3) according to the amount of fuel at this time, The burner (1) is configured to blow a combustion air volume adapted to the amount of fuel, and if the burner (1) misfires within a predetermined time from the start of combustion stored in the CPU (42), this misfire is detected by the flame detection sensor (5). ) is detected, and when the next combustion starts after detection, the combustion air volume is reduced from the combustion air volume adapted to the fuel amount stored in this CPU (42).
3), the rotation of the blower motor (30) that rotationally drives this blower (3) is controlled to reduce the amount of combustion air blown by this blower (3), and re-combustion is performed. It is.

When the dryer (6) is started by operating the operating device (9) at the front of the dryer (6), the ignition heater (24) of the burner (1) is energized and the ignition heater (20 becomes red hot). , fuel is in the fuel tank (17), fuel hose (33)
, the fuel pump (2), the fuel supply pipe (34), and the fuel nozzle (25) to the outer peripheral surface of the scattering body (2B),
The fuel is scattered onto the inner wall of the vaporization tube (13) by the scattering body (2B), and while flowing down the inner wall of the vaporization tube (1B), there is a small gap between the vaporization tube (18) and the vaporization ffi (27). A part of this ejected fuel is splashed onto the red-hot ignition heater (20) and automatically ignites to start combustion, and the combustion air is sucked in from the intake port (31) and the air blower II (3).
Air is blown into the ventilation chamber (18) through the ventilation duct (32), the combustion flame heats the vaporization cylinder (19), and the fuel flowing down inside the vaporization cylinder (18) is vaporized. Fuel burns! It burns while ejecting from the nozzle (23) and the nozzle (28), forming a combustion flame, which is detected by the flame detection sensor (5), which detects the flame. During this period, it is determined that the burner (1) is burning normally and continues combustion.

This combustion flame and the outside air passing around the burner (1) become drying hot air, which is then discharged from the dryer (6)! ! &
(10), the grains are ventilated across the drying chamber (12), and the grains stored in this dryer (6) are dried while flowing down from the storage chamber (11) into the drying chamber (12). When the grains are dried by being exposed to hot air and reach a specified moisture content, the operating device (9
) is automatically controlled by the air volume control device (39) of the dryer (6).
), but at the start of this drying work, the hot air temperature setting (37) of the operating device (9) is operated depending on the type and amount of grain stored in the dryer (6). By doing so, the amount of fuel to be combusted in the combustion section (4) of the burner (1) is controlled by the air volume control device (39) of the operating device (9) so that the hot air temperature is set by this operation. The fuel pump (2) is automatically controlled and supplied, and the combustion air is
The optimum amount corresponding to this amount of fuel is the air volume control device (39).
The rotation of the blower (3) is automatically controlled and the blower (
In step 3), air is blown into the air blowing chamber (18) of the burner (i), and the burner (1) is combusted.

If the burner (1) misfires within a predetermined time after the burner (1) starts combustion, the flame detection sensor (5) detects this misfire, and after this detection, when combustion starts again, the blower (3) ) The combustion air volume blown by the blower (3) is reduced from the combustion air volume commensurate with the amount of fuel, which is stored in the air volume control device (39), and the burner (1) is blown by the combustion air volume. do.

If the burner (1) misfires within a predetermined time after the start of combustion, the blower (3) is controlled so that the combustion air volume is reduced, so that the combustion air volume does not become excessive and the burner (1) ) will not cause repeated misfires.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is an enlarged side sectional view, Fig. 3 is an enlarged rear view,
FIG. 4 is a partially cutaway front view of the dryer, and FIG. 5 is an enlarged front view of a portion of the dryer. In the figure, (1) is the burner, (2) is the fuel pump, and (3) is the burner.
) indicates the blower, (4) indicates the combustion section, and (5) indicates the flame detection sensor.

Claims (1)

[Claims] A fuel pump (2) is provided to supply fuel into the burner (1) which burns while jetting fuel forward, and the fuel pump (2) directs a combustion air volume into the burner (1) in accordance with the amount of fuel supplied. An air blower (3) is provided to blow air, and a flame detection sensor (5) is provided to detect combustion flame ejected from the combustion section (4) of the burner (1). A burner control device comprising an air volume control device that controls the combustion air volume to be reduced to a smaller amount than the combustion air volume during the combustion when starting re-combustion after detecting a misfire within a certain period of time.