Flue gas recirculation burner

Abstract

The utility model relates to a flue gas recirculation burner which comprises a shell, a communicating pipe is fixedly arranged on the side wall of the shell in a penetrating mode, an exhaust pipe is installed at the end, located outside the shell, of the communicating pipe through a connecting piece, a suction hood is arranged in an inner cavity of the shell, and the end, located inside the shell, of the communicating pipe is communicated with the interior of the suction hood. Combustible gas mixed with a large amount of oxygen is conveyed into the combustion chamber to be combusted along the suction hood under the action of negative pressure generated by high-speed rotation of the impeller, in the combustion process of the combustible gas, the high-temperature booster pump can be started, and part of smoke is conveyed into the communicating pipe again along the smoke return pipeline through the high-temperature booster pump. After the smoke is mixed with the combustible gas sucked in the communicating pipe, the smoke is conveyed into the combustion chamber again for circulating combustion under the negative pressure effect generated by rotation of the impeller, and the problems that in an existing mode, the combustible gas is combusted at a time, the combustible gas is combusted insufficiently, and a large amount of combustible gas is wasted are solved as much as possible.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, specifically relating to a flue gas recirculation burner. Background Technology

[0002] A burner is a general term for a device that sprays fuel and air in a specific manner for combustion. Burners are classified into several types based on their application: industrial burners, combustion engines, civil burners, and special burners. They are mostly made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or titanium. The function of a burner is to atomize a sample through flame combustion. The atomized sample enters the burner, and under the influence of the flame temperature and atmosphere, undergoes processes such as drying, melting, evaporation, and dissociation, producing a large number of ground-state atoms, as well as some excited-state atoms, ions, and molecules. A well-designed burner should have high atomization efficiency, low noise, and stable flame to ensure high absorption sensitivity and measurement precision.

[0003] During the use of existing burners, due to the high internal temperature and pressure, insufficient oxygen supply may lead to incomplete combustion of the gas, resulting in a large waste of the combustion substrate. Furthermore, the flue gas produced by incomplete combustion contains a large number of particles, which can cause environmental damage when discharged with the flue gas. Utility Model Content

[0004] The purpose of this invention is to provide a flue gas recirculation burner with a simple structure and reasonable design in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A flue gas recirculation burner includes a housing with a connecting pipe fixedly inserted through its side wall. An exhaust pipe is connected to one end of the connecting pipe outside the housing via a connector. An intake hood is disposed within the inner cavity of the housing. One end of the connecting pipe inside the housing communicates with the interior of the intake hood. An impeller is disposed within the inner cavity of the intake hood. A servo motor for driving the impeller to rotate is fixedly mounted on one side of the housing. A combustion chamber is fixedly mounted on the side of the housing away from the servo motor. An exhaust pipe is fixedly connected to the end of the combustion chamber away from the housing. A high-temperature booster pump is disposed above the combustion chamber. The exhaust end of the high-temperature booster pump communicates with the interior of the combustion chamber. A return flue pipe is connected to the exhaust end of the high-temperature booster pump. The end of the return flue pipe away from the high-temperature booster pump passes through the housing and the connecting pipe and extends into the connecting pipe. A section of the return flue pipe located within the inner cavity of the connecting pipe is coaxially arranged with the connecting pipe.

[0007] As a further optimization of this utility model, the end of the air extraction pipe away from the connecting pipe is rotatably connected to a pipe joint, and an internal thread is provided on the inner side wall of the pipe joint. The air extraction pipe is screwed and fixed to the external air supply pipe through the pipe joint and the internal thread.

[0008] As a further optimization of this utility model, a connecting plate is fixedly installed on the adjacent ends of the connecting pipe and the exhaust pipe. Multiple aligned connecting holes are opened on the periphery of the two connecting plates, and a screw is inserted into the connecting hole. The two connecting plates are connected by the screw thread.

[0009] As a further optimization of this utility model, the air intake hood has a ring structure, one end of the air intake hood is fixedly connected to the inner wall of the housing, and the other end of the air intake hood is connected to the interior of the combustion chamber.

[0010] As a further optimization of this utility model, a mounting base is provided at the bottom of one end of the servo motor near the housing, the servo motor is fixed to the housing through the mounting base, and a sealed bearing is installed at the connection between the output end of the servo motor and the housing.

[0011] As a further optimization of this utility model, a controller is provided above the high-temperature booster pump, and an igniter is provided in the combustion chamber, with the igniter electrically connected to the controller.

[0012] The beneficial effects of this invention are as follows: the combustible gas mixed with a large amount of oxygen is transported to the combustion chamber for combustion along the intake hood under the negative pressure generated by the high-speed rotation of the impeller. During the combustion of the combustible gas, a high-temperature booster pump can be started to transport part of the flue gas back to the connecting pipe along the flue gas return pipe. After mixing with the combustible gas drawn in by the connecting pipe, the flue gas is then transported back to the combustion chamber for cyclic combustion using the negative pressure generated by the impeller rotation. This avoids the problem of incomplete combustion of combustible gas and a large waste of combustible gas that may occur in the existing method of single combustion of combustible gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one side of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the other side of the overall structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the installation structure of the servo motor, impeller, suction hood, and connecting pipe of this utility model;

[0017] Figure 5 This is a schematic diagram of the connection structure of the servo motor, impeller and mounting base of this utility model.

[0018] In the diagram: 1. Shell; 2. Connecting pipe; 3. Extraction pipe; 4. Pipe joint; 5. Connecting plate; 51. Screw; 6. Suction hood; 7. Impeller; 8. Servo motor; 9. Mounting base; 10. Combustion chamber; 11. Exhaust pipe; 12. High-temperature booster pump; 13. Return smoke pipe; 14. Controller. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example

[0021] like Figure 1 - Figure 5 As shown, a flue gas recirculation burner includes a housing 1 with a connecting pipe 2 fixedly inserted through its side wall, and a pipe joint 4 rotatably connected to the end of the exhaust pipe 3 away from the connecting pipe 2. The inner side wall of the pipe joint 4 is provided with an internal thread. The exhaust pipe 3 is screwed to an external gas supply pipe through the pipe joint 4 and the internal thread. The screwed connection method facilitates the installation and disassembly of the exhaust pipe 3 and the external gas supply pipe.

[0022] The connector includes a connecting plate 5 fixedly installed on the adjacent ends of the connecting pipe 2 and the suction pipe 3. Multiple aligned connecting holes are opened on the periphery of the two connecting plates 5. A screw 51 is inserted into the connecting hole. The two connecting plates 5 are threaded together by the screw 51, so that the end of the suction pipe 3 away from the pipe joint 4 can be stably connected through the connecting plate 5, the screw 51 and the connecting hole. The connecting plate 5 is made of flexible material. When the two connecting plates 5 are connected by the screw 51, they fit tightly together, which can greatly improve the airtightness of the connection between the suction pipe 3 and the connecting pipe 2.

[0023] An air intake hood 6 is provided in the inner cavity of the housing 1. The air intake hood 6 has a ring structure. One end of the air intake hood 6 is fixedly connected to the inner wall of the housing 1. One end of the connecting pipe 2 located inside the housing 1 is connected to the inside of the air intake hood 6, which can discharge combustible gas into the air intake hood 6 through the connecting pipe 2.

[0024] An impeller 7 is installed in the inner cavity of the air intake hood 6. A gap is left between the periphery of the impeller 7 and the inner wall of the air intake hood 6 to minimize the collision or friction between the impeller 7 and the inner wall of the air intake hood 6 during rotation, which could lead to the deformation and damage of the impeller 7.

[0025] A servo motor 8 for driving the impeller 7 to rotate is fixedly installed on one side of the housing 1. A mounting base 9 is provided at the bottom of the end of the servo motor 8 near the housing 1. The servo motor 8 is fixed to the housing 1 through the mounting base 9. A sealed bearing is installed at the connection between the output end of the servo motor 8 and the housing 1. The mounting base 9 is provided to improve the stability of the installation of the servo motor 8. The installation of a sealed bearing at the connection between the output end of the servo motor 8 and the housing 1 reduces the frictional resistance of the impeller 7 rotation and prevents combustible gas from leaking from the connection between the output end of the servo motor 8 and the housing 1.

[0026] A combustion chamber 10 is fixedly installed on the side of the housing 1 away from the servo motor 8. The end of the suction hood 6 away from the servo motor 8 is connected to the inside of the combustion chamber 10. When the servo motor 8 drives the impeller 7 to rotate at high speed and generate negative pressure, the combustible gas mixed with a large amount of oxygen can be drawn into the suction hood 6 through the negative pressure combined with the connecting pipe 2 and the suction pipe 3. The combustible gas is then transported to the combustion chamber 10 along the suction hood 6 for ignition and combustion. The end of the combustion chamber 10 away from the housing 1 is fixedly connected to the exhaust pipe 11, which is used to discharge the flue gas generated by combustion from the combustion chamber 10.

[0027] A high-temperature booster pump 12 is installed above the combustion chamber 10. The suction end of the high-temperature booster pump 12 is connected to the inside of the combustion chamber 10, and the exhaust end of the high-temperature booster pump 12 is connected to a return smoke pipe 13. The end of the return smoke pipe 13 away from the high-temperature booster pump 12 passes through the housing 1 and the connecting pipe 2 and extends into the connecting pipe 2. The section of the return smoke pipe 13 located in the inner cavity of the connecting pipe 2 is coaxially arranged with the connecting pipe 2. During the combustion process in the combustion chamber 10, the high-temperature booster pump 12 can be started. The high-temperature booster pump 12 will transport part of the flue gas back to the connecting pipe 2 along the return smoke pipe 13. After mixing with the combustible gas drawn into the connecting pipe 2, the flue gas will be transported back to the combustion chamber 10 for cyclic combustion by the negative pressure generated by the rotation of the impeller 7. This avoids the problem of incomplete combustion of combustible gas and a large waste of combustible gas that may occur in the existing method of single combustion of combustible gas.

[0028] A controller 14 is installed above the high-temperature booster pump 12, and an igniter is installed inside the combustion chamber 10. The igniter is electrically connected to the controller 14. When combustible gas is delivered into the combustion chamber 10, the user can control the igniter to ignite the combustible gas in the combustion chamber 10 through the controller 14, which is convenient for the user.

[0029] It should be noted that, in use, this flue gas recirculation burner first connects the extraction pipe 3 to the external gas supply pipe via the pipe connector 4. Then, the servo motor 8 is started, which drives the impeller 7 to rotate rapidly within the intake hood 6, creating a negative pressure within the intake hood 6. This negative pressure draws combustible gas mixed with a large amount of oxygen into the intake hood 6. Since the end of the intake hood 6 furthest from the servo motor 8 is connected to the combustion chamber 10, the combustible gas, after entering the intake hood 6, will be transported along the intake hood 6 to the combustion chamber 10. At this point, the igniter can be controlled via the controller 14. The combustible gas in the combustion chamber 10 is ignited, causing it to burn within the chamber. During combustion, a high-temperature booster pump 12 is activated to transfer a portion of the flue gas back to the connecting pipe 2 via the return flue pipe 13. This flue gas mixes with the combustible gas drawn into the connecting pipe 2 and is then transferred back to the combustion chamber 10 for cyclic combustion using the negative pressure generated by the impeller 7. This method avoids the problem of incomplete combustion and significant waste of combustible gas that can occur with existing methods that involve single-stage combustion.

[0030] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A flue gas recirculation burner comprising a housing (1) with a side wall in which a communication tube (2) is fixed, said communication tube (2) being fitted at its end outside the housing (1) with an extraction tube (3) by means of a connection, characterized in that: The shell (1) cavity is provided with an air suction cover (6), one end of the communication pipe (2) is communicated with the inside of the air suction cover (6), the air suction cover (6) cavity is provided with an impeller (7), one side of the shell (1) is fixedly installed with a servo motor (8) for driving the impeller (7) to rotate, the side of the shell (1) away from the servo motor (8) is fixedly installed with a combustion chamber (10), one end of the combustion chamber (10) away from the shell (1) is fixedly connected with a smoke exhaust pipe (11), the top of the combustion chamber (10) is provided with a high-temperature booster pump (12), the high-temperature booster pump (12) gas suction end is communicated with the inside of the combustion chamber (10), the high-temperature booster pump (12) exhaust end is connected with a smoke return pipeline (13), one end of the smoke return pipeline (13) away from the high-temperature booster pump (12) extends to the communication pipe (2) after penetrating through the shell (1) and the communication pipe (2), and the smoke return pipeline (13) is coaxially arranged with the communication pipe (2) in the communication pipe (2) cavity.

2. A flue gas recirculation burner according to claim 1, characterised in that: The end of the air suction pipe (3) away from the communication pipe (2) is rotatably connected with a pipe joint (4), an internal thread is formed in the inner side wall of the pipe joint (4), and the air suction pipe (3) is fixedly connected with an external gas supply pipeline through the pipe joint (4) and the internal thread.

3. A flue gas recirculation burner according to claim 1, characterized in that: The adjacent ends of the communication pipe (2) and the air suction pipe (3) are fixedly installed with connecting plates (5), a plurality of connecting holes are formed in the circumferential side of the two connecting plates (5), a screw rod (51) is arranged in the connecting hole, and the two connecting plates (5) are threadedly connected through the screw rod (51).

4. A flue gas recirculation burner according to claim 1, characterized in that: The air suction cover (6) is in ring structure, one end of the air suction cover (6) is fixedly connected with the inner wall of the shell (1), and the other end of the air suction cover (6) is communicated with the inside of the combustion chamber (10).

5. A flue gas recirculation burner according to claim 1, characterized in that: The end of the servo motor (8) close to the shell (1) is provided with a mounting seat (9), the servo motor (8) is fixedly connected with the shell (1) through the mounting seat (9), and a sealing bearing is arranged at the connection between the output end of the servo motor (8) and the shell (1).

6. A flue gas recirculation burner according to claim 1, characterized in that: The high-temperature booster pump (12) is provided with a controller (14), and an igniter is arranged in the combustion chamber (10) and electrically connected with the controller (14).

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