KR100689657B1 - Air cooling burner device for high density fuels and operating method thereof - Google Patents

Abstract

An air cooling burner apparatus for a high viscosity fuel and a method for operating the same are provided to minimize the environmental contamination due to exhaust gas by obtaining a complete combustion. An air cooling burner apparatus for a high viscosity fuel includes a nozzle unit(200), a wind box(100), a second combustion chamber(400), a second air duct(310), a third combustion chamber(500), and a metal housing(530). The nozzle unit injects the high viscosity fuel. A first air duct is connected to one side of the wind box. The second air duct is formed at the circumference of the first combustion chamber. The second combustion chamber includes a castable(410) with the diameter to become gradually smaller toward the discharge direction. The second air duct supplies air into the second combustion chamber. The third combustion chamber includes the castable cylindrically protruding to the front side of the castable comprising the second combustion chamber. The metal housing includes an air cooling passage(420) for cooling the castable.

Description

Air cooling burner device for high viscosity fuel and its operation method

1 is a schematic cross-sectional view of an air-cooled burner device for a high viscosity fuel according to the present invention,

2 is a front view of the rotating plate 330 of FIG. 1,

3 is a circuit diagram of the nozzle unit 200 and the fuel shown in FIG.

4 is a partially enlarged cross-sectional view showing the inside of the nozzle unit 200 shown in FIG.

5 is a perspective view of the wind box 100 and the primary air duct 110 shown in FIG.

6 is a fuel circuit diagram showing a process of circulating and preheating high viscosity fuel,

7 is a fuel circuit diagram illustrating a process of supplying and injecting preheated high viscosity fuel.

<Description of the symbols for the main parts of the drawings>

100: wind box, 110: primary air duct,

120: wing, 200: nozzle stand,

210: first nozzle, 211: preheated fuel,

212: second nozzle, 214: third nozzle,

215: third nozzle connecting pipe, 216: preheated fuel return pipe,

217: second nozzle connecting pipe, 218: preheating pipe,

219: first nozzle connecting pipe, 220: automatic valve,

222: first return valve, 224: second return valve,

226: third return valve, 230: preheated fuel supply pipe,

232: auxiliary tank, 232a: fuel distribution,

232b: fuel return unit, 235: fuel return tube,

240 heater device, 242 second valve,

244: first valve, 246: pump,

250: direction change valve, 254: air exhaust passage,

256: fuel supply pipe, 260: fuel tank,

300: primary combustion chamber, 310: secondary air duct,

320: cylindrical bulkhead, 330: rotating plate,

335 blade, 340 first flange,

400: Second combustion chamber, 410: Castable,

420: air cooling furnace, 450: second flange,

500: tertiary combustion chamber, 520: air outlet,

530: metal housing.

The present invention relates to a burner device, and more particularly, to an air-cooled burner device for a high viscosity fuel and a method of operating the same.

In the case of highly viscous waste vegetable oils (e.g., soybean oil, palm oil, waste edibles, etc.) or bunker C oil, incineration as a fuel is very inexpensive and a considerable cost and environmental pollution occurs in a separate treatment or landfill. This is being actively promoted.

However, in the case of the burner apparatus using waste vegetable oil or bunker C oil as fuel, since only the first combustion is performed at the discharge portion, a large amount of carbon (soot) is attached to the castable (refractory material), thereby reducing thermal efficiency. . In addition, the combustion gas generated due to incomplete combustion includes a large amount of contaminants, resulting in secondary pollution (eg, air pollution).

In addition, due to the temperature rise of the castable, there is a disadvantage in that the crack is generated in the castable itself and the life thereof is shortened. Due to the disadvantages of such burners, high viscosity waste vegetable oils (eg, soybean oil, palm oil, waste edibles, etc.) or bunker C oil are not used as fuels.

Accordingly, the present invention has been made to solve the above problems, the first object of the present invention is to increase the residence time in the burner of the fuel through the back ignition, thereby high viscosity to achieve a temperature rise and complete combustion An air-cooled burner device for fuel and a method of operating the same are provided.

A second object of the present invention is to provide an air-cooled burner device and a method of operating the same for high-viscosity fuel which can increase the service life by lowering the temperature of the castable by installing an air cooling furnace around the castable despite the internal high temperature. To provide.

It is a third object of the present invention to provide an air-cooled burner device for a high viscosity fuel that can use highly viscous oil, such as vegetable oil, vegetable waste, industrial waste oil or bunker C oil, and a method of operating the same.

An object of the present invention as described above is fixed to the rear of the primary combustion chamber 300, the front is open nozzle nozzle 200 for injecting high viscosity fuel; A wind box 100 having the nozzle unit 200 at the center and having a primary air duct 110 connected to one side to supply air for the primary combustion chamber 300; A secondary combustion chamber (400) formed therein including a circumferential castable (410) provided in front of the primary combustion chamber (300) to gradually reduce an inner diameter in a discharge direction of fuel; A secondary air duct 310 formed around the primary combustion chamber 300 to supply air to the secondary combustion chamber 400; A tertiary combustion chamber 500 formed therein including a castable 410 provided to protrude in a cylindrical shape in front of the catable 410 constituting the secondary combustion chamber 400; An air cooling furnace 420 provided to be spaced apart from the outer circumference of the castable 410 to cool the castable 410 by moving the secondary air to the outside of the castable 410 is disposed inside. It can be achieved through an air-cooled burner device for high viscosity fuel comprising a metal housing 530 to be provided.
In addition, a cylindrical partition 320 is further provided around the primary combustion chamber 300 so that air introduced into the secondary air duct 310 is secondaryly burned between the cylindrical partition 320 and the castable 410. It may be suitable to enter the combustion chamber 400.

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In addition, the one end of the cylindrical partition wall 320 is preferably provided with a rotating plate 330 formed with a plurality of blades 335 on the circumference.

In addition, the wind box 100 is cylindrical, it may be preferable that the plurality of wings 120 protrude further toward the center in the inner diameter.

Further, the high viscosity fuel more preferably includes at least one selected from soybean oil, palm oil, waste cooking oil, bunker C oil.

In addition, the nozzle unit 200; A plurality of nozzles 210, 212, 214 formed at one end; Nozzle connection pipes 215, 217, and 219 respectively connected to the nozzles 210, 212, and 214 through the inside of the nozzle unit 200; A preheating tube 218 having one end inserted into the nozzle stand 200 to supply and fill a preheating fuel 211 into the nozzle stand 200; And a preheated fuel return tube 216, one end of which is inserted into the nozzle stand 200 to return the preheated fuel 211 in the nozzle stand 200.

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And, it is most preferable that the length of the preheated fuel return pipe 216 exposed inside the nozzle stand 200 is longer than the length of the preheated pipe 218 exposed inside the nozzle stand 200.

In addition, return valves (222, 224, 226) provided at the other end of the nozzle connecting pipe (215, 217, 219), respectively; Each return valve 222, 224, 226 is connected, and the other end of the preheating tube 218 is connected to a fuel powder for distributing the heated fuel to the respective return valves 222, 224, 226 or the preheating tube 218. Distribution 232a; An automatic valve 220 provided at the other end of the preheated fuel return pipe 216; And a fuel return unit 232b to which the automatic valve 220 is connected and returns to circulate the fuel returned from the nozzle unit 200.

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The heater device 240 further includes a heater device 240 provided between the fuel distribution unit 232a and the fuel return unit 232b to preheat the fuel.

An object of the present invention as described above is another category, (i-1) the step of preheating the heater device 240 high-viscosity fuel supplied from the fuel tank (260) (S110); (i-2) filling the inside of the nozzle unit 200 through the preheating pipe 218 connected to the fuel distribution unit 232a with the preheated fuel (S120); (i-3) returning to the fuel return unit 232b through the preheated fuel return pipe 216 inside the nozzle unit 200 after the preheating fuel 211 is filled in the nozzle unit 200 (S130). ; (i-4) returning the fuel in the fuel return unit 232b to the heater device 240 and reheating it (S140); Preheating step of the fuel consisting of (S100); And (ii) closing the preheated fuel return pipe 220 and supplying the preheated fuel from the fuel distribution part 232a through the nozzle connection pipes 215, 217, and 219 (S200). (iii) a primary combustion step (S300) of igniting while injecting fuel through a plurality of nozzles (210, 212, 214) connected to the nozzle connecting pipe (215, 217, 219, respectively); It can also be achieved by a method of operating an air-cooled burner device for fuel.

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And, the secondary combustion step of supplying air to the primary combustion front through the secondary air duct 310 (S400); And

It is most preferable to further include; a third combustion step (S500) in which the gas discharged after the secondary combustion meets the atmosphere and burns.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments described in conjunction with the accompanying drawings.

The invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments are shown.

1 is a schematic cross-sectional view of an air-cooled burner device for a high viscosity fuel according to the present invention. As shown in FIG. 1, the burner device of the present invention includes a nozzle unit 200 fixed to the rear of the primary combustion chamber 300 having an open front to inject high viscosity fuel; A wind box 100 having the nozzle unit 200 at the center and having a primary air duct 110 connected to one side to supply air for the primary combustion chamber 300; A secondary combustion chamber (400) formed therein including a circumferential castable (410) provided in front of the primary combustion chamber (300) to gradually reduce an inner diameter in a discharge direction of fuel; A secondary air duct 310 formed around the primary combustion chamber 300 to supply air to the secondary combustion chamber 400; A tertiary combustion chamber 500 formed therein including a castable 410 provided to protrude in a cylindrical shape in front of the catable 410 constituting the secondary combustion chamber 400; An air cooling furnace 420 provided to be spaced apart from the outer circumference of the castable 410 to cool the castable 410 by moving the secondary air to the outside of the castable 410 is disposed inside. An air-cooled burner device for high viscosity fuel comprising a metal housing 530 to be provided.
In more detail, the nozzle unit 200 is installed at the center of the cylindrical wand box 100 as a nozzle for injecting the supplied fuel in a vaporized form. The primary air duct 110 is connected to one side of the wind box 100 has a configuration to supply the outside air. The primary air duct 110 serves to supply air to the primary combustion chamber (300).

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The cylindrical partition wall 320 is a fireproof material, and the nozzle stand 200 is exposed at the center. A secondary air duct 310 is formed around the cylindrical partition wall 320. The secondary air duct 310 serves to supply air to the secondary combustion chamber 400. Although there may be a difference depending on the capacity of the burner device, the inner diameter of the cylindrical bulkhead 320 is about 400 mm and the length is about 350 mm.

The rotating plate 330 is fixed to the inlet through which the air of the secondary air duct 310 exits to the secondary combustion chamber 400. That is, the rotating plate 330 is annular, the inner ring is fixed to the cylindrical partition wall 320, the outer ring is fixed to the region of the second flange 450 of the metal material. As shown in FIG. 2, a plurality of blades 335 are formed on the rotating plate 330, so that air supplied by the secondary air duct 310 rotates in a swirl shape by the blades 335 and is secondary. It enters the combustion chamber 400.

The castable 410 forms an inner wall of the secondary combustion chamber 400 as a refractory material, and extends forward to form an inner wall of the cylindrical tertiary combustion chamber 500. As an example, the length of the secondary combustion chamber 400 is about 500 mm, and the inner diameter of the tertiary combustion chamber 500 is about 280 mm. The castable 410 raises the internal temperature due to the insulation effect, and minimizes heat transfer to the outside. In addition, the inner diameter of the circumferential castable 410 constituting the secondary combustion chamber 400 tapered toward the front, that is, the diameter became smaller with respect to the combustion progress direction. This increases the amount of air that hits the inner wall of the castable 410 (wind pressure rise), thus minimizing the attachment of carbon (soot) to the inner wall of the castable 410.

The metal housing 530 has a shape that is approximately similar to the outer shape of the castable 410. However, it is formed a little larger than the appearance of the castable 410 to maintain a gap therebetween, the gap is to function as the air cooling furnace 420. That is, a part (60% to 70%) of the air exiting the rotating plate 330 enters the secondary combustion chamber 400, and the remaining air (30% to 40%) flows along the air cooling furnace 420. The star 410 is cooled. The air that has become hot while cooling the castable 410 in the air cooling furnace 420 is discharged through the air discharge port 520 at the end, and helps the combustion in the tertiary combustion chamber 500.

FIG. 2 is a front view of the rotating plate 330 of FIG. 1. As shown in FIG. 2, the rotating plate 330 is fixed to an inlet from which air of the secondary air duct 310 exits to the secondary combustion chamber 400. That is, the rotating plate 330 is annular, the inner ring is fixed to the cylindrical partition wall 320, the outer ring is fixed to the region of the second flange 450 of the metal material. As shown in FIG. 2, a plurality of blades 335 are formed on the rotating plate 330, so that air supplied by the secondary air duct 310 strikes the blade 335 and rotates in a vortex shape. The vehicle enters the combustion chamber 400. That is, the air swirls rather than enters the laminar flow and enters the secondary combustion chamber 400 in a vortex shape, thereby further promoting complete combustion inside the secondary combustion chamber 400.

A portion of the air that rotates like a vortex through the rotating plate 330 enters the air cooling furnace 420 and exits the air discharge port 520, thereby causing more active heat exchange in the air cooling furnace 420. This means that there is a high air cooling effect for the castable (410).

3 is a circuit diagram illustrating the nozzle unit 200 and the fuel shown in FIG. 1. As shown in FIG. 3, the nozzle unit 200 is connected to one side and a circuit configuration of the fuel is provided to the other side.

Fuel tank 260, fuel supply pipe 256, directional valve 250, pump 246, the first valve 244, the heater device 240, the second valve 242 and the preheat fuel supply pipe 230 Are connected in series. Directional valve 250 is a valve for returning the fuel returned in the preheating operation to the pump 246 side, the pump 246 generates a power transmission of the fuel, the heater device 240 heats the high viscosity fuel to the viscosity It is a device that lowers and converts into a state that is easy to spray. The heater device 240 has a temperature sensor (not shown) is attached to prevent overheating of the fuel, preheating or preheating the fuel based on the output value of the temperature sensor.

The first and second valves 244 and 242 before and after the heater 240 are used to control the flow rate or other needs. Such a configuration is not a special configuration of the present invention but a member that is commonly used in the art, so a detailed description of the internal configuration will be omitted.

The auxiliary tank 232 is divided into a fuel distribution section 232a and a fuel return section 232b. One side of the fuel distribution unit 232a is connected to the preheated fuel supply pipe 230, and the other side of the fuel distribution unit 232a is connected to the first, second and third return valves 222, 224, 226, and the preheating tube 218. The fuel return unit 232b has an automatic valve 220 connected to one side thereof, and a fuel return tube 235 connected to the other side thereof. The fuel return pipe 235 is a member for circulating the fuel being heated for preheating, one end of which is connected to the fuel return unit 232b and the other end of which is connected to the direction switching valve 250.

The first, second and third return valves 222, 224 and 226 and the automatic valve 220 may be operated manually or based on a temperature sensor output value of the heater device 240 using a microcomputer (not shown). It can be operated automatically.

One end of the first nozzle connecting pipe 219 is inserted to the end of the nozzle unit 200 to form a first nozzle 210 at the end, and the other end is connected to the first return valve 222. One end of the second nozzle connecting pipe 217 is inserted to the end of the nozzle unit 200 to form a second nozzle 212 at the end, and the other end is connected to the second return valve 224. One end of the third nozzle connecting pipe 215 is inserted to the end of the nozzle unit 200 to form a third nozzle 214 at the end, and the other end is connected to the third return valve 226.

One end of the preheating tube 218 is connected to the fuel distribution unit 232a, and the other end is provided in the nozzle unit 200. One end of the preheated fuel return tube 216 is connected to the fuel return unit 232b, and the other end is provided in the nozzle unit 200.

One end of the air discharge path 254 is attached to the direction change valve 250 and the other end is connected to the fuel tank 260. The air discharge path 254 functions to increase the preheating effect by separating and discharging air that may exist inside the fuel being supplied or the fuel being circulated.

4 is a partially enlarged cross-sectional view illustrating the inside of the nozzle unit 200 shown in FIG. 3. As illustrated in FIG. 4, the nozzle unit 200 includes a plurality of nozzles 210, 212, and 214 formed at one end thereof. ), Nozzle connection pipes 215, 217, and 219 connected to the nozzles 210, 212, and 214 through the inside of the nozzle unit 200, respectively, and one end is inserted into the nozzle unit 200, and the A preheating tube 218 for supplying and filling the preheating fuel 211 into the nozzle stand 200; And a preheated fuel return tube 216, one end of which is inserted into the nozzle stand 200 to return the preheated fuel 211 in the nozzle stand 200.
That is, the inside of the nozzle unit 200 is filled with the preheating fuel 211 by the fuel discharged from the preheating tube 218. The first, second, and third nozzle connecting pipes 219, 217, and 215 are connected to the respective nozzles 210, 212, and 214 through the preheated fuel 211 in the nozzle unit 200.

At this time, the length of the preheating tube 218 in the nozzle unit 200 is shorter than the preheating fuel return tube 216 in the nozzle unit 200. This is because the preheating fuel 211 discharged from the preheating tube 218 sufficiently exits through the preheating fuel return tube 216 in a form that sufficiently fills and overflows the inside of the nozzle unit 200.

Although not shown in FIG. 4, a separate ignition device (not shown) is installed near the nozzle of the nozzle unit 200. This is a device for ignition with the injection of fuel.

5 is a perspective view of the wind box 100 and the primary air duct 110 shown in FIG. As shown in FIG. 5, the wand box 100 has a cylindrical shape made of a metal material, and six to ten wings 120 are attached to an inner surface thereof. And, the lower end of the wind box 100 is the primary air duct 110 is located. Therefore, the air flowing from the primary air duct 110 hits the wing 120 of the wind box 100 and becomes uniform and is supplied to the primary combustion chamber 300.

Hereinafter, an operation method of an air-cooled burner device for a high viscosity fuel according to the present invention will be described in detail with reference to the accompanying drawings. First, the preheating process of high viscosity fuel is demonstrated. 6 is a fuel circuit diagram showing a process of circulating and preheating the high viscosity fuel. As shown in FIG. 6, the first, second and third return valves 222, 224 and 226 are closed and the automatic valve 220 is opened. Then, the high viscosity fuel supplied from the fuel tank 260 is the fuel supply pipe 256, the diverter valve 250, the pump 246, the first valve 244, the heater device 240, the second valve 242 And it passes sequentially through the preheated fuel supply pipe (230). At this time, it is heated while passing through the heater device 240. However, once the fuel passes through the heater device 240, it is not sufficiently preheated.

Then, the fuel passing through the preheating fuel supply pipe 230 flows into the nozzle unit 200 through the preheating tube 218 while gathering in the fuel distribution unit 232a. At this time, since the 1, 2, 3 return valves 222, 224, 226 are closed, only the preheating pipe 218 flows.

The preheated fuel 211 discharged by the preheating tube 218 in the nozzle stand 200 fills the inside of the nozzle stand 200 and exits to the preheating fuel return pipe 216. After that, since the automatic valve 220 is opened, the fuel return tube 235 passes through the fuel return unit 232b. Thereafter, the divert valve 250 returns the returned fuel back to the pump 246. Therefore, the temperature is raised by the heater device 240 while the fuel continues to circulate. If it is determined that the fuel is preheated to a predetermined temperature by a temperature sensor (not shown) mounted in the heater device 240, the preheating process is completed, and the fuel is injected from the nozzle.

7 is a fuel circuit diagram illustrating a process of supplying and injecting preheated high viscosity fuel. As shown in FIG. 7, the first, second and third return valves 222, 224, and 226 are opened for the injection of fuel, and the automatic valve 220 is closed. Then, the fuel in the fuel distribution unit 232a is transferred to each of the first, second, and third nozzle connection pipes 219, 217, and 215 through the first, second, and third return valves 222, 224, and 226. Thereafter, fuel is injected from the connected first, second and third nozzles 210, 212 and 214, respectively. As an example of such a nozzle unit 200, the nozzle unit 200 is to inject about 4 liters of fuel per hour at 23 Bar.

Due to the heated preheating fuel 211 in the nozzle unit 200, the fuel in the first, second, and third nozzle connection tubes 219, 217, and 215 in the nozzle unit 200 is also preheated. Therefore, even if not used for a long time through the preheating process, such as the present invention can be prevented blockage phenomenon or injection failure due to the high viscosity of the fuel in advance.

Due to the closing of the automatic valve 220, the preheating fuel 211 inside the nozzle unit 200 does not flow and remain as it is. Subsequently, fuel is combusted in the primary combustion chamber 300 through ignition, and primary and secondary air ducts 110 and 310 operate to supply air. Then, combustion is made in the primary combustion chamber 300 by the air provided from the primary air duct 110, and the air provided from the secondary air duct 310 is supplied through the rotating plate 330 to the secondary combustion chamber 400. Secondary combustion occurs in the secondary combustion chamber (400). The internal temperature of the burner device through such combustion is raised to about 1,300 ℃.

A part of the air exiting the rotating plate 330 enters the air cooling path 420, cools the castable 410, and is discharged into the atmosphere through the air discharge port 520. At this time, tertiary combustion takes place around the air discharge port 520. That is, the air supplied to the secondary air duct 310 is for combustion and air cooling.

As the tapered inclined surface of the castable 410 collides with the air supplied by the primary air duct 110 and the secondary air duct 310, carbon is not attached to the inclined surface. If there is no such duct and air flow, the oil sprayed from the nozzle may not be burned and stick to the surface of the castable 410. Through this process, the air-cooled burner device is continuously supplied with high viscosity fuel and burns even a small amount of unburned fuel for complete combustion.

Burner device according to the invention can be applied to applications such as boilers, incinerators, waste incinerators.

Therefore, according to one embodiment of the present invention as described above, it is possible to increase the residence time in the burner of the fuel through the back ignition, thereby achieving a temperature rise and complete combustion. In other words, it is possible to minimize the environmental pollution caused by the exhaust gas and increase the economics.

In addition, despite the high temperature inside, by installing an air cooling furnace around the castable, the temperature of the castable can be lowered to increase the service life. This has the effect of reducing the maintenance cost of the burner device.

In addition, high viscosity oils such as vegetable oil, vegetable waste, industrial waste oil, or bunker C oil can be used to increase resource utilization and reduce treatment costs and secondary environmental pollution (eg, water pollution).

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that all modifications fall within the scope of the appended claims.

Claims (11)

A nozzle unit 200 fixed to the rear of the primary combustion chamber 300 whose front is open to inject high viscosity fuel; A wind box 100 having the nozzle unit 200 at the center and having a primary air duct 110 connected to one side to supply air for the primary combustion chamber 300; A secondary combustion chamber (400) formed therein including a circumferential castable (410) provided in front of the primary combustion chamber (300) to gradually reduce an inner diameter in a discharge direction of fuel; A secondary air duct 310 formed around the primary combustion chamber 300 to supply air to the secondary combustion chamber 400; A tertiary combustion chamber 500 formed therein including a castable 410 provided to protrude in a cylindrical shape in front of the catable 410 constituting the secondary combustion chamber 400; An air cooling furnace 420 provided to be spaced apart from the outer circumference of the castable 410 to cool the castable 410 by moving the secondary air to the outside of the castable 410 is disposed inside. A metal housing 530 to be provided; Air-cooled burner device for high viscosity fuel comprising a. The method of claim 1, A cylindrical partition 320 is further provided around the primary combustion chamber 300, and the air introduced into the secondary air duct 310 passes between the cylindrical partition 320 and the castable 410. Air-cooled burner device for high viscosity fuel, characterized in that flow into the secondary combustion chamber (400). 3. The air-cooled burner device for high viscosity fuel according to claim 2, wherein one end of the cylindrical partition wall (320) is further provided with a rotating plate (330) having a plurality of blades (335) formed on the circumference. The method of claim 1, The wind box 100 is cylindrical, the inner diameter of the air-cooled burner device for a high viscosity fuel, characterized in that the plurality of wings 120 are further protruded toward the center. The air-cooled burner device of claim 1, wherein the high viscosity fuel comprises at least one selected from soybean oil, palm oil, edible oil, and bunker C oil. The method of claim 1, wherein the nozzle unit 200 A plurality of nozzles 210, 212, 214 formed at one end; Nozzle connection pipes 215, 217, and 219 respectively connected to the nozzles 210, 212, and 214 through the inside of the nozzle unit 200; A preheating tube 218 having one end inserted into the nozzle stand 200 to supply and fill a preheating fuel 211 into the nozzle stand 200; And A preheated fuel return tube 216, one end of which is inserted into the nozzle stand 200 to return the preheated fuel 211 inside the nozzle stand 200; Air-cooled burner device for a high viscosity fuel comprising a. The method of claim 6, wherein the length of the preheated fuel return tube 216 exposed to the inside of the nozzle unit 200 is longer than the length of the preheating tube 218 exposed to the inside of the nozzle unit 200. Air-cooled burner unit for high viscosity fuels. The method of claim 6, Return valves (222, 224, 226) provided at the other ends of the nozzle connection pipes (215, 217, 219), respectively; Each of the return valves 222, 224, and 226 is connected, and the other end of the preheating tube 218 is connected to distribute the heated fuel to each of the return valves 222, 224, and 226 or the preheating tube 218. A fuel distribution unit 232a; An automatic valve 220 provided at the other end of the preheated fuel return pipe 216; And And a fuel return unit (232b) connected to the automatic valve and returning to circulate the fuel returned from the nozzle unit (200). The air-cooled burner device for high viscosity fuel further comprising a. The method of claim 8, And a heater device (240) provided between the fuel distribution unit (232a) and the fuel return unit (232b) to preheat the fuel. (I-1) the heater device 240 preheats the high viscosity fuel supplied from the fuel tank 260 (S110); (i-2) filling the inside of the nozzle unit 200 through the preheating pipe 218 connected to the fuel distribution unit 232a with the preheated fuel (S120); (i-3) returning the preheated fuel 211 remaining after filling the inside of the nozzle unit 200 to the fuel return unit 232b through the preheating fuel return tube 216 inside the nozzle unit 200 (S130). ); (i-4) returning the fuel in the fuel return unit 232b to the heater device 240 and reheating it (S140); Preheating step of the fuel consisting of (S100); And (ii) closing the preheated fuel return pipe (220) and supplying the preheated fuel from the fuel distribution unit (232a) through the nozzle connection pipes (215, 217, 219) (S200); (iii) a primary combustion step (S300) of igniting while injecting fuel through a plurality of nozzles (210, 212, 214) connected to the nozzle connecting pipe (215, 217, 219, respectively); Operation method of air-cooled burner device for high viscosity fuel. The method of claim 10, A secondary combustion step (S400) of supplying air to the primary combustion front through a secondary air duct (310); And And a third combustion step (S500) in which the gas discharged after the second combustion meets and combusts with the atmosphere (S500).

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