CN110906323A - A preheating fuel combustion device - Google Patents

Abstract

The invention discloses a preheating fuel oil combustion device, which comprises: a fuel storage tank; the oil pumping preheating mechanism comprises an oil pump, a buffer oil tank, a preheating pipeline and a heating device, wherein the oil pump pumps fuel oil into the buffer oil tank, and the fuel oil flows out of the preheating pipeline and is heated by the heating device; the burner comprises an oil injection pipe body, a combustion pipe body, an igniter and a blower, wherein the oil injection pipe body receives fuel oil conveyed from the preheating pipeline and sprays the fuel oil out of the preheating pipeline to combust to generate flame; the device can solve the technical problems of lower heat value, insufficient combustion and unstable combustion flame of the existing fuel oil combustion device.

Description

A preheating fuel combustion device

technical field

The invention relates to a preheating fuel combustion device, which belongs to the field of burners.

Background technique

Existing fuel combustion devices generally use compressed air to pressurize the fuel tank to force an appropriate amount of fuel to be injected into the burner for combustion. This fuel method has the following problems: 1. The fuel is directly injected and burned, and its calorific value is low, and it often cannot be fully burned; 2. The pressure fluctuates during fuel injection, and the combustion flame is not stable enough.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a preheating fuel oil combustion device to solve the technical problems of low calorific value, insufficient combustion and unstable combustion flame existing in the existing fuel oil combustion device.

The technical scheme of the present invention is: a preheating fuel combustion device, comprising:

Fuel storage tanks for holding fuel;

Oil preheating mechanism, including:

an oil pump, the inlet end of the oil pump is connected to the fuel storage tank through an oil pipeline;

a buffer oil tank, the pump outlet port of the oil pump is connected to the buffer oil tank through a pump oil pipeline, and the oil pump pumps the fuel in the fuel storage tank to the buffer oil tank;

a preheating pipeline, the inlet end of the preheating pipeline is connected to the buffer oil tank;

a heating device, arranged close to the preheating pipeline, for heating the fuel oil in the preheating pipeline;

burner, including:

an oil injection pipe body, the oil injection pipe body includes an oil injection end and an oil supply end, and the oil supply end is connected with the outlet end of the preheating pipeline;

a combustion tube body, which has a combustion nozzle end and a closed end, the fuel injection tube is arranged in the combustion tube body and is close to the combustion nozzle end;

an igniter, arranged in the fuel injection pipe body and close to the fuel injection end, for igniting the fuel;

A blower, the blower outlet of which is arranged in the combustion tube body and between the fuel injection end and the closed end, so as to deliver the air outside the combustion tube to the fuel injected from the fuel injection end Air required for combustion.

Further, the burner further includes a combustion control assembly, and the fuel injection pipe body is provided with a first electric valve;

the combustion control assembly is electrically connected to the control end of the first electric valve;

the combustion control assembly is electrically connected to the control end of the igniter;

the combustion control assembly is electrically connected to the control end of the blower;

The opening and closing of the first electric valve, the ignition of the igniter, and the opening and closing of the blower are controlled by the combustion control assembly.

Further, the oil pumping preheating mechanism also includes:

a liquid level detection sensor, arranged in the buffer oil tank;

The second electric valve is arranged on the oil pump pipeline;

an oil pumping preheating control assembly, the oil pumping preheating control assembly is respectively electrically connected with the liquid level detection sensor, the oil pump and the control end of the second electric valve, and the liquid level detection sensor detects them The liquid level value of the buffer oil tank is transmitted to the oil pumping preheating control assembly, and the oil pump and the second electric valve act according to the control command of the oil pumping preheating control assembly.

Further, the heating device includes an electromagnetic heating controller and an electromagnetic heating coil, the electromagnetic heating controller is electrically connected with the electromagnetic heating coil, and the electromagnetic heating coil is wound on the preheating pipe;

The power supply end of the electromagnetic heating controller is electrically connected to the oil preheating control assembly, and the electromagnetic heating controller controls the electromagnetic heating coil to preheat the preheating according to the command from the oil preheating control assembly Heating of pipes.

Further, the pump oil pipeline is connected to the lower part of the buffer oil tank, and the preheating pipeline is connected to the upper part of the buffer oil tank.

Further, a one-way valve is provided on the preheating pipeline at a position close to the buffer oil tank, so as to prevent the fuel from returning from the preheating pipeline to the buffer oil tank.

Further, the pump outlet port of the oil pump is provided with an exhaust branch pipe in parallel with the pump oil pipeline, and an exhaust valve is provided on the exhaust branch pipe.

Further, a pressure relief valve is provided on the preheating pipeline.

Further, the preheating pipeline is connected to the oil supply ends of several burners through a multi-pass pipeline joint and an oil pipeline.

The beneficial effects of the present invention are: during combustion, the fuel oil is pumped from the fuel oil storage tank to the buffer fuel tank by the oil pump, and after entering the preheating pipeline and heated by the heating device, it is supplied to the fuel injection pipeline and sprayed from the fuel injection end, It is ignited by the igniter, the blower supplies the oxygen required for its combustion, and the flame produced by the combustion of the fuel is sprayed out to supply heat. Compared with the existing fuel combustion device, the device has three advantages: first, the temperature of the fuel is increased, and after being injected by the fuel injection pipe body, it can not only be ignited instantaneously and quickly, but also can improve the combustion efficiency; The pressure of the fuel is increased, and it is almost sprayed from the fuel injection end of the fuel injection pipe in a mist form, so it can make the combustion more sufficient; the third is that the fuel is not directly injected by the fuel pump, but is stored and buffered by the buffer tank. , which can reduce the pressure fluctuation of the fuel, and can make the fuel gradually and slowly overflow into the preheating pipeline for continuous heating, so as to avoid fuel failure.

Description of drawings

1 is a schematic structural diagram of a preheating fuel combustion device in an embodiment;

Fig. 2 is the enlarged schematic diagram of the fuel storage tank in Fig. 1;

Fig. 3 is the enlarged schematic diagram of the oil pumping preheating mechanism in Fig. 1;

Fig. 4 is the enlarged schematic diagram of the heating device in Fig. 3;

Fig. 5 is the enlarged schematic diagram of the burner in Fig. 1;

Fig. 6 is the schematic diagram of the uniform emission plate in Fig. 5;

Fig. 7 is the control structure diagram of the oil-pumping preheating mechanism;

Fig. 8 is the control structure diagram of the burner;

Description of reference numbers:

100 fuel storage tanks, 200 oil preheating mechanisms, 300 burners;

101 cap, 102 fuel outlet;

210 oil pump, 211 oil pipeline, 212 valve, 213 pump oil pipeline, 214 exhaust branch pipe, 215 exhaust valve, 216 second electric valve, 220 buffer oil tank, 221 liquid level detection sensor, 230 preheating pipeline, 231 one-way valve , 232 pressure relief valve, 233 temperature detection sensor, 234 multi-way pipe joint, 240 heating device, 241 electromagnetic heating coil;

310 fuel injection pipe body, 311 fuel injection end, 312 fuel supply end, 313 first electric valve, 320 combustion pipe body, 321 combustion nozzle end, 322 closed end, 323 equal shot plate, 330 igniter, 340 blower.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation disclosed below.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIGS. 1 to 8 , which are schematic diagrams of the overall structure of a preheating fuel combustion device in an embodiment. The preheating fuel combustion device includes a fuel storage tank 100 , an oil extraction preheating mechanism 200 and a burner 300 . in,

Please refer to FIG. 1 and FIG. 2 together, the fuel storage tank 100 is mainly used for holding fuel. Specifically, the fuel storage tank 100 is a box structure, and a fuel inlet is provided on the tank body, and a corresponding opening cover 101 is provided. The fuel can be introduced into the fuel storage tank 100 through the fuel inlet, and the opening cover 101 The box is closed and covered. A fuel outlet 102 is also opened at the lower part of the tank to discharge the fuel.

Please refer to FIGS. 1 , 3 and 4 together. The oil pumping preheating mechanism 200 includes an oil pump 210 , a buffer oil tank 220 , a preheating pipeline 230 , a heating device 240 , a liquid level detection sensor 221 , a temperature detection sensor 233 and an oil pumping device. Preheat control assembly. The oil extraction and preheating mechanism 200 is mainly used to extract the fuel oil in the fuel oil storage tank 100, and after preheating, the fuel oil is sent to the burner 300 for combustion.

The oil pump 210, the inlet end of the oil pump 210 is connected with the fuel storage tank 100 through the oil pipeline 211. The oil pump 210 is mainly used to pump out the fuel in the fuel storage tank 100 . Specifically, the oil pump 210 is a pressure pump, such as a high pressure pump. Preferably, the pump outlet port of the oil pump 210 is provided with an exhaust branch pipe 214 in parallel with the pump oil pipeline 213, and an exhaust valve 215 is installed on the exhaust branch pipe 214. The oil pump 210 and the gas in the pipeline are discharged. In order to facilitate control, a valve 212 is provided on the oil pipeline 211 to control the delivery of fuel oil. For example, after baking is completed, the valve 212 can be used to close the oil pipeline 211 . Valve 212 may be a manual valve.

In the buffer oil tank 220 , the pumping port of the oil pump 210 is connected to the buffer oil tank 220 through the pump oil pipeline 213 , and the oil pump 210 pumps the fuel in the fuel storage tank 100 to the buffer oil tank 220 . After the fuel pump 210 sends the fuel pump 210 to the buffer fuel tank 220, the buffer fuel tank 220 can temporarily store the fuel before preheating. The advantage of this structure is that the pressure fluctuation of the fuel pump 210 can be alleviated, so that the fuel supply pressure is more balanced , the combustion is more stable and controllable. Preferably, a pressure detection gauge is provided on the buffer oil tank 220 to observe the pressure in the buffer oil tank 220 from the outside at any time. At the same time, in order to prevent the fuel in the buffer tank 220 from flowing back into the pump oil pipeline 213 and the oil pump 210 when the oil pump 210 is not working, a second electric valve 216 is installed on the pump oil pipeline 213 to control the switch of the pump oil pipeline 213 .

The preheating pipeline 230 is connected to the buffer oil tank 220 at the inlet end of the preheating pipeline 230 . The preheating pipeline 230 is mainly used for supplying the preheated fuel flowing from the buffer tank 220 to the burner 300 . Specifically, the preheating pipe 230 may be a steel pipe. Preferably, a check valve 231 is provided on the preheating pipeline 230 near the buffer oil tank 220 to prevent the preheated fuel from flowing back into the buffer oil tank 220 from the preheating pipeline 230 . In addition, a pressure relief valve 232 is installed on the preheating pipeline 230 to set a safe pressure relief value. When the pressure in the preheating pipeline 230 exceeds the pressure relief value, the pressure relief valve 232 automatically releases the pressure.

Preferably, the pump oil pipeline 213 is connected to the lower part of the buffer oil tank 220, and the preheating pipeline 230 is connected to the upper part of the buffer oil tank 220, so the fuel is input from the lower part of the buffer oil tank 220 and discharged from the upper part of the buffer oil tank 220. This structure can The fuel gradually and slowly overflows into the preheating pipeline 230 for continuous heating, so as to avoid fuel failure.

The heating device 240 is disposed near the preheating pipeline 230 and is used for heating the fuel oil in the preheating pipeline 230 . Specifically, the heating device 240 includes an electromagnetic heating controller and an electromagnetic heating coil 241. The electromagnetic heating controller is electrically connected to the electromagnetic heating coil 241, and the electromagnetic heating coil 241 is wound on the preheating pipe 230. The fuel in line 230 is heated. For example, the fuel can be preheated to 150°C.

Preferably, the part of the preheating pipeline 230 wound with the electromagnetic heating coil 241 is arranged vertically, and is located above the interface between the preheating pipeline 230 and the buffer tank 220, so that the fuel from the buffer tank 220 will gradually overflow and be transported to the preheating pipeline 230, after being fully and uniformly heated by the heating device 240, it is output.

The liquid level detection sensor 221 is arranged in the buffer oil tank 220 . The liquid level detection sensor 221 is mainly used to detect the liquid level value in the buffer oil tank 220 . The liquid level detection sensor 221 may be a float level gauge.

The temperature detection sensor 233 is installed in the preheating pipe 230 . Specifically, the temperature detection sensor 233 is disposed in the preheating pipe 230 where the electromagnetic heating coil 241 is wound, and is used to sense the temperature of the heated fuel. The temperature detection sensor 233 may be a temperature sensor.

The oil pumping preheating control component is mainly used for oil pumping and preheating control of the oil pumping preheating mechanism 200 . The oil preheating control components are mainly controllers, such as PLC microcontrollers.

Specifically, referring to FIG. 7 , the temperature detection sensor 233 is electrically connected to the oil extraction preheating control assembly, and the oil extraction preheating control assembly is electrically connected to the electromagnetic heating controller. The temperature detection sensor 233 sends the preheating temperature value of the fuel oil to the oil preheating control component, and the electromagnetic heating controller controls the heating of the preheating pipeline 230 by the electromagnetic heating coil 241 according to the command from the oil preheating combustion control component. For example, the preheating temperature of the fuel is set to be 150°C to 160°C, when the temperature detection sensor 233 detects that the fuel temperature is lower than 150°C, if the electromagnetic heating ring 241 is still heating at this time, the oil pumping preheating control component controls The electromagnetic heating controller continues to heat the electromagnetic heating coil 241 . If the electromagnetic heating coil 241 has stopped heating at this time, the oil pumping preheating control component controls the electromagnetic heating controller to start to heat the electromagnetic heating coil 241 . When the temperature detection sensor 233 detects that the fuel temperature is between 150°C and 160°C, the oil pumping preheating control assembly controls the electromagnetic heating controller to keep the existing action unchanged. When the temperature detection sensor 233 detects that the fuel temperature is above 160° C., the oil-pumping preheating control assembly controls the electromagnetic heating controller to be turned off to stop the heating of the electromagnetic heating coil 241 .

Referring to FIG. 7 , the liquid level detection sensor 221 is electrically connected to the oil extraction preheating control assembly, and the oil extraction preheating control assembly is electrically connected to the oil pump 210 and the control end of the second electric valve 216 respectively. The liquid level value of the buffer oil tank 220 detected by the liquid level detection sensor 221 is transmitted to the oil pumping preheating control assembly, and the oil pump 210 and the second electric valve 216 act according to the control command of the oil pumping preheating control assembly. For example, if the liquid level value range of the fuel pumping liquid is set, for example, 5L-8L, when the liquid level detection sensor 221 detects that the liquid level value is lower than 5L, if the second electric valve 216 is in the open state at this time, and the oil pump 210 In the oil pumping state, the oil pumping preheating control component controls the oil pump 210 and the second electric valve 216 to keep the existing state unchanged. If the second electric valve 216 is in the closed state and the oil pump 210 is also in the stopped state, The oil preheating control assembly controls the second electric valve 216 to open, and simultaneously starts the oil pump 210 to perform oil pumping work. When the liquid level detection sensor 221 detects that the liquid level is between 5L and 8L, the oil preheating control assembly controls the second electric valve 216 and the oil pump 210 to keep the existing state unchanged. When the liquid level detection sensor 221 detects that the liquid level value is above 5L-8L, the oil pumping preheating control assembly controls the second electric valve 216 to close, and the oil pump 210 stops pumping oil at the same time.

Please refer to FIG. 1 , FIG. 5 and FIG. 6 together, the burner 300 is mainly used to burn the preheated fuel oil, and supply the heat generated by the combustion to the oven for baking. The burner 300 includes a fuel injection tube body 310, a combustion tube body 320, an igniter 330, a blower 340, and a combustion control assembly.

The fuel injection pipe body 310 includes a fuel injection end 311 and an fuel supply end 312 , and the fuel supply end 312 is connected to the outlet end of the preheating pipe 230 . The fuel injection pipe body 310 is mainly used to spray the preheated fuel, and the fuel is input from the fuel supply end 312 and sprayed from the fuel injection end 311 . Specifically, the fuel injection pipe body 310 is a tubular structure made of steel, and its fuel injection end 311 converges to form a conical nozzle. Of course, in other embodiments, the fuel injection end 311 can also be a nozzle structure. Alternatively, a nozzle is installed on the fuel injection pipe body 310 to form the fuel injection end 311 .

The combustion tube body 320 has a combustion nozzle end 321 and a closed end 322 . The fuel injection end 311 is disposed in the combustion tube body 320 and is close to the combustion nozzle end 321 . The combustion tube body 320 is mainly used as a combustion place for fuel oil. Specifically, the fuel injection pipe body 310 is disposed on the axis of the combustion pipe body 320 , wherein the fuel injection end 311 is close to the combustion nozzle end 321 , and the fuel supply end 312 passes through the closed end 322 and extends outward. Preferably, an equalizing plate 323 is installed in the combustion nozzle end 321. The equalizing plate 323 is a circular plate matched with the combustion tube body 320. It is divided into several strands for combustion. Since there is a certain gap between each strand, the fuel can be fully burned, thereby improving the combustion efficiency.

The igniter 330 is arranged in the fuel injection pipe body 310 and is arranged close to the fuel injection end 311 . The igniter 330 is mainly used to ignite the fuel injected from the fuel injection end 311 . The igniter 330 may be a fuel igniter 330 .

The blower 340340, the blower outlet of the blower 340 is arranged in the combustion pipe body 320, and is located between the fuel injection end 311 and the closed end 322, so as to transport the air outside the flue-cured tobacco room into the combustion pipe body 320, and supply it from the fuel injection end 311 The air needed to burn the injected fuel. Specifically, the air inlet of the blower 340 is arranged outside the flue-curing room, and the outlet of the blower is arranged on the wall surface of the combustion pipe body 320 . The blower 340 may be a centrifugal blower.

After the fuel passes through the pumping and preheating mechanism 200, it has the following three advantages: first, the temperature of the fuel increases, and after being injected by the fuel injection pipe body 310, it can not only be ignited instantaneously and quickly, but also can improve the combustion efficiency; second It is because the pressure of the fuel is increased, and it is almost sprayed from the fuel injection end 311 of the fuel injection pipe in the form of a mist, so the combustion can be made more sufficient; the third is that the fuel is not directly injected by the fuel pump 210, but is buffered. The fuel tank 220 stores buffer, which can reduce the pressure fluctuation of the fuel, and can make the fuel gradually and slowly overflow into the preheating pipeline 230 for continuous heating, so as to avoid fuel cutoff.

The combustion control assembly is mainly used to control the operation of the burner 300 . The combustion control component can be a controller, such as a PLC microcontroller, which is a common control device.

Please refer to FIG. 8 together for the convenience of realizing the intelligent control of the burner 300 . A first electric valve 313 is provided on the fuel injection pipe body 310 , and the first electric valve 313 is mainly used to close and open the fuel injection pipe body 310 , that is, to determine whether to perform fuel injection, because the position is close to the fuel injection end 311 , so the combustion can be quickly extinguished when needed.

The combustion control assembly is electrically connected to the control end of the first electric valve 313 . The combustion control assembly is electrically connected to the control end of the igniter 330, and the combustion control assembly is electrically connected to the control end of the blower 340. The combustion control assembly controls the opening and closing of the first electric valve 313, the ignition of the igniter 330, and the opening and closing of the blower 340. , to facilitate control

In this embodiment, the oil preheating mechanism 200 may supply oil to one or more burners 300 . When supplying fuel to multiple burners 300 , the preheating pipeline 230 is connected to the fuel supply ends 312 of the multiple burners 300 through the multi-way pipeline joint 234 and the fuel pipeline 211 . In this way, the different burners 300 can be supplied with oil via one preheating line 230 . The multi-way pipe joint 234 may be a three-way pipe joint or a four-way pipe joint.

When the oil extraction preheating mechanism 200 supplies oil to one burner 300, the oil extraction preheating control component and the combustion control component may be the same control component, or may be different control components. When the oil-pumping preheating mechanism 200 supplies oil to a plurality of burners 300 , the oil-pumping preheating control assembly and the combustion control assembly are different control assemblies, wherein the oil-pumping preheating control assembly is mainly used for the oil-pumping preheating mechanism 200 and each combustion control component is mainly used to control the roasting of the corresponding flue-curing room.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (9)

1. A preheating type fuel oil combustion device is characterized by comprising:

a fuel storage tank (100) for containing fuel;

oil pumping preheating mechanism (200) comprising:

the inlet end of the oil pump (210) is connected with the fuel storage tank (100) through an oil pipeline (211);

a buffer oil tank (220), wherein a pumping-out port of the oil pump (210) is connected with the buffer oil tank (220) through an oil pumping pipeline (213), and the oil pump (210) pumps the fuel in the fuel storage tank (100) into the buffer oil tank (220);

a preheating pipeline (230), wherein the inlet end of the preheating pipeline (230) is connected with the buffer oil tank (220);

a heating device (240) disposed adjacent to the preheating pipe (230) for heating the fuel in the preheating pipe (230);

burner (300), comprising:

the oil injection pipe body (310) comprises an oil injection end (311) and an oil supply end (312), and the oil supply end (312) is connected with the outlet end of the preheating pipeline (230);

a combustion nozzle body (320) having a combustion nozzle end (321) and a closed end (322), said fuel injector tube being disposed within said combustion nozzle body (320) and proximate to said combustion nozzle end (321);

the igniter (330) is arranged in the oil injection pipe body (310) and is close to the oil injection end (311) and is used for igniting fuel oil;

a blower (340), a blower outlet of the blower (340) is arranged in the combustion tube body (320) and is positioned between the oil injection end (311) and the closed end (322) so as to convey air outside the combustion tube body (320) to air required by fuel oil sprayed from the oil injection end (311) during combustion.

2. The preheating type fuel combustion apparatus according to claim 1, wherein: the combustor (300) further comprises a combustion control assembly, and a first electric valve (313) is arranged on the oil injection pipe body (310);

the combustion control assembly is electrically connected with a control end of the first electrically operated valve (313);

the combustion control assembly is electrically connected with the control end of the igniter (330);

the combustion control assembly is electrically connected with a control end of the blower (340);

the opening and closing of the first electrically operated valve (313), the ignition of the igniter (330), and the switching of the blower (340) are controlled by the combustion control assembly.

3. The preheating type fuel combustion apparatus according to claim 1, wherein: the oil pumping preheating mechanism (200) further comprises:

a liquid level detection sensor (221) disposed in the buffer oil tank (220);

a second electrically operated valve (216) disposed on the oil pumping pipe (213);

the oil pumping preheating control assembly is respectively and electrically connected with the liquid level detection sensor (221), the oil pump (210) and the control end of the second electric valve (216), the liquid level detection sensor (221) transmits the detected liquid level value of the buffer oil tank (220) to the oil pumping preheating control assembly, and the oil pump (210) and the second electric valve (216) act according to the control command of the oil pumping preheating control assembly.

4. The preheating type fuel combustion apparatus according to claim 3, wherein: the heating device (240) comprises an electromagnetic heating controller and an electromagnetic heating coil (241), the electromagnetic heating controller is electrically connected with the electromagnetic heating coil (241), and the electromagnetic heating coil (241) is wound on the preheating pipeline (230);

the power end of the electromagnetic heating controller is electrically connected with the oil pumping preheating control assembly, and the electromagnetic heating controller controls the electromagnetic heating ring (241) to heat the preheating pipeline (230) according to a command from the oil preheating control assembly.

5. The preheating type fuel combustion apparatus according to claim 1, wherein: the oil pumping pipeline (213) is connected with the lower part of the buffer oil tank (220), and the preheating pipeline (230) is connected with the upper part of the buffer oil tank (220).

6. The preheating type fuel combustion apparatus according to claim 1, wherein: a one-way valve (231) is arranged on the preheating pipeline (230) at a position close to the buffer oil tank (220) so as to prevent the fuel oil from flowing back into the buffer oil tank (220) from the preheating pipeline (230).

7. The preheating type fuel combustion apparatus according to claim 1, wherein: and a pump-out port of the oil pump (210) is provided with an exhaust branch pipe (214) connected with the oil pumping pipeline (213) in parallel, and the exhaust branch pipe (214) is provided with an exhaust valve (215).

8. The preheating type fuel combustion apparatus according to claim 1, wherein: and a pressure relief valve (232) is arranged on the preheating pipeline (230).

9. A preheating type fuel oil combustion apparatus according to any one of claims 1 to 8, wherein: the preheating pipeline (230) is connected with the oil supply ends (312) of the plurality of burners (300) through a multi-channel pipeline joint (234) and an oil conveying pipeline (211).

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