JPS63267809A - Burner - Google Patents

Abstract

PURPOSE:To prevent red-flame combustion and achieve satisfactory combustion by a method wherein the rotation of a diffusion cylinder which receives fuel supply and induces and diffuses the fuel by rotation is able to be switched over from low to high speed. CONSTITUTION:When fuel supplied to a diffusion cylinder 1 and induced to diffuse by rotation flows down along the inner wall part of the cylinder 1, which receives the heat of combustion flames, the vaporization of the fuel is promoted. When the rotation of the cylinder 1 is sped up at the time of low-volume combustion, the film the supplied fuel is thinned and speed flowing down along the inner wall is high and the liquid fuel therefore vaporized uniformly. As a result, it does not take place that at the tip part, etc., of the cylinder 1 fuel supply is interrupted and the fuel is overheated and spattered from the inner wall part to form oil droplets, and the fuel is able to receive vaporization action and red-flame combustion caused by the condition that oil-droplet-shaped fuel is ejected from an ejecting port 2 and burnt can be prevented. When the rotation of the cylinder 1 is slowed down at the time of high- volume combustion, the fuel can receive sufficient vaporization action and therefore the red-flame combustion caused by the condition that the fuel not vaporized sufficiently is ejected from the port 2 and burnt, can be prevented.

Description

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

Conventional technology Conventionally, fuel supplied to a diffusion cylinder that rotates at a constant rotation is vaporized within this diffusion cylinder, and this vaporized fuel is ejected and combusted from an injection port provided between the diffusion cylinder and an injection combustion disk. It was a burner to do.

Problems to be Solved by the Invention For example, when the burner is used in a grain dryer, the fuel supplied to the diffusion cylinder is vaporized within the diffusion cylinder while flowing down the inner wall of the diffusion cylinder. This vaporized fuel ejects and burns into a combustion flame from the spout formed between the diffusion tube and the jet combustion disk, and this combustion flame is sucked by the exhaust fan installed in the dryer, producing hot air. The grains are exposed to this hot air and dried, but depending on the amount of grains to be dried, the amount of fuel supplied into the diffusion cylinder can vary widely, for example from 0.7 to 4 cycles/h. When the amount of fuel supplied is large, there is a large amount of fuel flowing down the inner wall of the diffusion cylinder, and a large amount of combustion air is supplied into the diffusion cylinder, so that proper vaporization is not performed and combustion occurs. Due to the movement of the air, it may reach the nozzle, and this unvaporized fuel may be ejected from the nozzle and burned, resulting in red-flame combustion.

Furthermore, when the amount of fuel supplied is small, the film thickness of the fuel flowing down the inner wall of the diffusion cylinder is thin, and the amount of combustion air supplied into the diffusion cylinder is also small, so that the fuel on the inner wall of the diffusion cylinder is interrupted. The area tends to be overheated, and this phenomenon spreads to the entire diffusion tube, causing the fuel flowing down the diffusion tube inner wall to burst from the inner wall and become oil droplets, and as the combustion air moves, the injection There were cases where red flames burned as the fuel reached the exit.

Means for Solving the Problems The present invention provides a diffusion tube (1) that receives fuel supply and guides diffusion through rotation, and a spout (2) that spouts vaporized fuel between the diffusion tube (1). ) forming a jet combustion disk (3
), and the burner is constructed such that the rotation of the diffusion cylinder (1) can be switched between low-speed rotation and high-speed rotation.

Functions and Effects of the Invention The vaporization of the fuel supplied into the diffusion tube (1) is promoted while it flows down the inner wall of the diffusion tube (1), which receives the heat of the combustion flame. At this time, since there is little combustion air and little fuel to be supplied, the inner wall of the diffusion tube (1) where the fuel is interrupted tends to be overheated, and the phenomenon gradually spreads throughout the diffusion tube (1). Then, at the front end of the diffusion tube (1), the supplied fuel is transferred to the diffusion tube (1).
It tends to burst from the inner wall (a phenomenon that occurs because only the surface side is rapidly superheated and evaporated) into the shape of oil droplets, and as the combustion air moves, it goes to the nozzle (2) or this nozzle (2). The fuel erupts and burns, resulting in so-called red-flame combustion. At this time, if the diffusion tube (1) is rotated at high speed, the film thickness of the supplied fuel will be distorted and the speed at which it will flow down the inner wall will be high, so that the liquid fuel can be evaporated uniformly, and the above-mentioned The appearance of oil droplets can be eliminated and an appropriate vaporization effect can be achieved, thereby preventing the red flame combustion described above.

On the other hand, during large combustion, the film thickness of the fuel flowing down the inner wall of the diffusion tube (1) is small, so if the diffusion tube (1) rotates quickly, this film thickness becomes too thin and the amount of combustion air is large. If the speed of the fuel flowing down the inner wall of the diffusion tube (1) is high and it reaches the injection port (2) before being properly vaporized, or if this unvaporized fuel is ejected and burned, red-flame combustion is likely to occur. In such a case, if the diffusion tube (1) is rotated at a low speed, a sufficient vaporization effect can be obtained, and the above-mentioned red flame combustion can be prevented.

EXAMPLE The illustrated example describes a burner (6) used in a dryer (5).

The machine wall (7) of the dryer (5) has a rectangular shape in plan view that is long in the front and back direction, and consists of one front and rear wall plate and a left and right wall plate, and this front wall plate has a burner case (6) in which the burner (6) is installed. 8) and an operating device (9) for starting and stopping the dryer (5), and an exhaust fan (10) on the rear wall plate. i! (7) A grain collection gutter (11) equipped with a transfer spiral is provided in the center of the lower part, and this grain collection gutter (
11) On the upper side, drying chambers (13) with a feeding valve (12) supported on the lower part are installed in parallel and communicated with each other, and the drying chambers (13)
, (13) A hot air chamber (14) is formed between the inner sides and communicated with the burner (6).
) is a hot air temperature sensor (15) that detects the hot air temperature.
Air exhaust 1 (1B), (1B) is formed outside the drying chambers (13), (13), and these air exhaust chambers (18), (16) and the air exhaust communicate with (lO),
This exhaust fan (10) is configured to be rotationally driven by a motor (2B).

A storage chamber (17) is formed above the drying chambers (13), (13), and a ceiling plate (18) is formed above the storage chamber (17).
(18) and a transfer gutter (18) equipped with a transfer spiral; a supply port for supplying transferred grains into the storage chamber (17) is provided in the center of the transfer gutter (19); A diffusion plate (20) is provided on the side, a window (2B) is provided on the front wall board, and a numerical value indicating the storage capacity is provided on the side of this window (23). .

A lift 41 (22) equipped with a packet conveyor (21) belt is provided at the front of the front wall plate, and a discharge tube (23) is provided between the upper end and the starting end of the transfer gutter (18). A supply gutter (20) is provided between the lower end and the terminal end of the grain collecting gutter (11) for communication, and a motor (25) is provided on the upper part of the grain hoist (22). 25) rotates the upper and lower transfer spirals, the delivery valve (12), the diffusion plate (20), and the bucket conveyor (21) belt, and a moisture sensor (27) is installed approximately in the center in the vertical direction. ), this moisture sensor (27) is equipped with a motor (28), and this motor (28) is activated by transmitting an electrical measurement signal from the operating device (9).
) rotates, and the moisture sensor (27) is rotationally driven to detect the grain moisture value.

The burner (6) is attached to a mounting plate (30) that protrudes from the inner wall of the lower plate of the burner case (8) in the -E direction, and the burner (6) has a cylindrical shape that blows combustion air to the rear. A blower tube (31) with an opening in the center of the front and rear wall plates is provided, and a variable speed motor (32) for changing the rotation of the diffusion tube (1) to low speed rotation, high speed rotation, etc. is provided in the blower tube (31). A combustion tube (33) with an open center is provided on the front wall plate of the blower tube (31), and a conical guide tube (30) with an open tip is provided in the opening of the combustion tube (33). The combustion tube (33) has a nozzle hole (33) through which a part of the vaporized fuel is spouted.
A jet combustion disc (3) is provided, which has a central part open and an inwardly inclined part.
) and the combustion tube (33), a passageway (3B) through which the vaporizing twist 4 passes is formed, and the combustion tube (33)
) An ignition heater (37) for igniting fuel and a flame sensor (38) for detecting the presence or absence of combustion flame are provided near the outer periphery, and the mounting plate (30) has an outside temperature sensor for detecting outside air temperature. This configuration includes a sensor (4).

At the shaft end of the variable speed motor (32), there is a scattering body (
40) and the diffusion tube (1) along the guide tube (34), the diffusion tube (1) has a shape like a tip and the mouth edge is bent toward the outer circumference, and the tip outer circumference (41) has a conical diameter expanding into a conical shape, the other end is a small diameter cylinder, and has a vertical part that connects this small diameter part and the wide diameter part, and fuel flows out between this vertical part and the mouth edge part. A jet orifice (2) is formed between the enlarged diameter part of the diffusion cylinder (1) and the inclined part of the jet combustion disc (3), This spout (2
), vaporized fuel is ejected from the combustion chamber, and this vaporized fuel is ejected and combusted to become a combustion flame.

A fuel tank (42) is provided at the front of the dryer (5),
A fuel pump (43) having fuel pulp is provided on the outer side of the lower plate of the burner case (8), and fuel is sucked from the fuel tank (42) by opening and closing the fuel valve, and the fuel nozzle (38) etc. It is configured to eject and supply to the outer peripheral part of the scattering body (40) through the.

Combustion air is supplied by rotating a blower (44) provided on the outer side of the upper plate of the burner case (8) with a motor (45). The air is sucked in through a suction tube (46) communicating with the air blower (44), and the air is blown into the air tube (31) through a blower duct (47) by the blower (44).

The operating device (9) is box-shaped, and the surface plate of the box has a start switch (48) for starting and stopping the dryer (5), a stop switch (49), and a target finishing moisture value. A target moisture setting knob (50) for setting a hot air temperature, a hot air temperature setting knob (51) for setting a hot air temperature, and a detection value detected by the hot air temperature sensor (15) and the moisture sensor (27) are alternately displayed. A display window (52) is provided to
It has a configuration in which a control device (53) and a rotation control device (54) are provided inside, and each setting knob (50) and (51) is a rotary switch type, and this setting knob (50)
When the surface board is moved to the position of the displayed numerical value as the finishing target, the finishing target moisture value is set, and the setting hole (51) is moved to the position of the displayed numerical value that is the finishing target. The hot air temperature is set by operating the numerical value on the window (29) so that it is in the same position as the numerical value displayed on the surface plate.

The rotation control device (50 is such that the detection value detected by the outside air temperature sensor (4) and the hot air temperature sensor (15) is A).
- an A-D converter (55) that performs D conversion, an input circuit (to which the converted value converted by this A-D converter (55) is input);
5B), an input circuit (57) into which the operation of the setting spreader (51) is input, each of these input circuits (5B), (
PCU (5B) that performs arithmetic and logical operations, comparison operations, etc. on various input values input from 57), this CPU (58)
Output circuit (5) that receives various commands from the
9).

The control device (53) includes an A-D converter (eo) in which the detection values detected by the moisture sensor (27) and the flame sensor (38) are converted into A-to-A, and this A-D converter (60).
) An input circuit (81) into which the converted value is input.
, an input circuit (82) into which the operations of the switches (48), (49) and the setting knob (50) are input; and various input values input from these input circuits (81), (62). The CPU that performs arithmetic and logical operations, comparison operations, etc.
(58) This configuration includes an output circuit (63) that receives and outputs various commands from the CPU (5B).

The rotation control device M (54) inputs the operation of the setting point (50) and the start switch (48) to the control device (53), and transmits the setting point (54) to the rotation control device ffi (54). When the operation 51) is input, the dryer (5) starts, the burner (6) and the moisture sensor (27) start, and the outside air temperature detected by the outside air temperature sensor (4) starts. is input, and this input value is set and stored in the CPU (58), for example,
When 10 degrees to 7 degrees are detected, the speed change motor (
32) is controlled to a high speed rotation, and the rotation 3 of the diffusion tube (1) is controlled to a high speed.
When changing 000r, p, +s to 3500r, p, +w to high speed rotation and detecting 7 degrees to 3 degrees, 750r, p,
The diffusion tube (1) was rotated at 3000 r by controlling it to m high-speed rotation.
, p, m is changed to 375 Or, P, 11 for high speed rotation,
When 3 degrees or less is detected, the configuration is such that the rotation is controlled at a high speed of 1000r, p, +sm, and the rotation of the diffusion tube (1) is changed from 3000r, p, m to 400or, p, m,
Also, depending on the operating position of the setting knob (51), the amount of fuel supplied from the fuel pump (43) into the burner (6) to the inner core CPU (58) ranges from 0.7 to 4.01/h. For example, if the setting and memorization is 3.5 to 4.0 cycles/h, the rotation of the diffusion tube (1) is 3000 r, p, m to 25
Change to low speed rotation to 0Or, p, m, 1.2 to 3.5
If it is 1/h, the standard rotation is 3000r, p, 11, and if it is 0.7 to 1.2Jl/h, it is 3000r,
P, 11 is changed to high speed rotation to 400 Or, p, m, the hot air temperature sensor (15) detects the hot air temperature generated from the burner (6), and the detected hot air temperature and the set Compare the set hot air temperature set by operating (51), and if there is a difference, control the number of opening and closing times of the fuel valve of the fuel pump (43) so that the temperature becomes the same as the set hot air temperature. , the fuel pump (43) is configured to change the amount of fuel sucked in, and the motor (45) is controlled depending on the amount of fuel sucked in, thereby controlling the air blower 411.
This configuration controls the combustion air blown at t (44).

Further, when the moisture sensor (27) detects a grain moisture value that is the same as the finishing target moisture value set by operating the setting transfer (50), the control device (53) automatically controls the dryer (5). It is configured to stop.

By operating the setting knobs (50) and (51) of the operating device m (9) to the predetermined positions and operating the start switch (48), the dryer (5) is started and at the same time the burner (6) is activated.
) and moisture sensor (27) are started and this burner (6
) is energized to the ignition heater (37) of the ignition heater (
37) becomes red hot, and the fuel flows from the fuel tank (42), through the fuel pump (43), through the fuel nozzle (39), and into the flying debris (4).
The fuel is sprayed and supplied to the outer circumference of the diffusion tube (1), and the scattering body (40) scatters this fuel to the inner wall of the diffusion tube (1).
) This diffusion tube (1) while flowing down the inner wall? A part of the ejected fuel is ejected from the small gap in the mounting section, and a portion of the ejected fuel is scattered onto the red-hot ignition heater (37), where it is automatically ignited and combustion begins.

This combustion heats the diffusion tube (1), and this diffusion tube (1) is heated.
) The fuel flowing down is vaporized, and this vaporized fuel is mixed with the combustion air blown by the blower ( 40
2) and the nozzle hole (35) eject and burn to form a combustion flame, and this combustion flame turns into hot air, which is then passed through the exhaust fan (
By being sucked in by the hot air chamber (10), the drying chamber (13) is ventilated, and the air is passed through the exhaust chamber (1B) to the exhaust fan (10).
) is suctioned and exhausted, and the drying 4!1 (5) storage chamber (1
7) The grains stored in the storage chamber (17) are exposed to this hot air and dried while flowing down in the drying chamber (13), and are then fed out to the lower part by the feeding valve (12). The grains are transferred and supplied into the grain raising machine (22) via the transfer gutter (11) and the feed gutter (20) by the transfer spiral at the bottom, and are then fed into the packet conveyor (22).
1), is transported to the upper part, passes through the dispensing tube (23), and is transferred to the transfer gutter (
19) and the upper transfer spiral transports this transfer trough (1
9) and onto the diffusion plate (20), where it is evenly diffused and returned into the storage chamber (17), circulated and dried, and set by the setting machine (50). When the moisture cessor (27) detects a grain moisture value that is the same as the finishing target moisture value, the dryer (5) is automatically stopped under automatic control by the control device (53) of the operating device (9).

Depending on the operating position of the setting machine (51) at the time of starting this drying work, the rotation speed of the diffusion tube (1) of the burner (6) is set to 2t (54) of the rotation control bag of the operating device (9).
The burner (6) is controlled to rotate at low speed or at high speed.
is combusted, and during this combustion, the outside air temperature detected by the outside air temperature sensor (4) is detected as a low temperature, and the diffusion cylinder (
The rotation speed of 1) is sequentially controlled to high speed rotation by the rotation control device (54), and the burner (6) burns.

By controlling the rotation speed of the diffusion cylinder (1) that diffuses the fuel of the burner (6), and controlling this control to high speed rotation or low speed rotation depending on the amount of supplied fuel and the outside temperature, the diffusion can be achieved. The vaporization state of the fuel within the cylinder (1) becomes stable, and the combustion state of the burner (6) becomes stable.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a flowchart, Fig. 3 is an enlarged side sectional view, Fig. 4 is an enlarged front view, and Fig. 5 is a drying FIG. 6 is an overall partially sectional side view of the dryer, FIG. 6 is an overall partially sectional front view of the dryer, and FIG. 7 is an enlarged front view of a portion of the dryer. In the figure, reference numeral (1) indicates a diffusion tube, (2) indicates an ejection port, and (3) indicates an ejection combustion disk.

Claims (1)

[Claims] Diffusion cylinder (1
) and the diffusion tube (1), there is provided a jet combustion disk (3) that forms a jet nozzle (2) for spouting vaporized fuel, and the rotation of the diffusion tube (1) is controlled by slow rotation and low speed rotation. A burner that can be switched to high-speed rotation.