A low nitrogen fuel burner

Abstract

The present invention is a low-nitrogen fuel burner, including a flame tube connected to the front end of the burner shell through a rotating flange assembly, a center seat assembly installed at the center of the inner cavity of the rotating flange assembly and the flame tube, the center seat assembly including a center inner tube, a diffusion plate installed at the front end of the center inner tube through a center support frame, an oil nozzle and an ignition needle assembly arranged in the center inner tube, a swirler sleeved on the center inner tube, a high-voltage ignition transformer installed on the burner shell connected to the ignition needle assembly through a circuit, a motor connected to an oil pump oil circuit system assembly, an oil pump oil circuit system assembly connected to the oil nozzle, a flue gas recirculation port is also opened on the side of the burner shell, a combustion air inlet box is provided on the flue gas recirculation port, a flue gas recirculation interface assembly is provided on the combustion air inlet box, and the flue gas recirculation interface assembly is connected to the flue gas recirculation interface assembly by taking a port when the flue gas temperature at the front of the boiler smoke pipe economizer is between 120°C and 220°C. Beneficial effects: reduced furnace temperature, reduced NO X Generation of.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a low-nitrogen fuel burner. Background Art

[0002] With the rapid development of industry in today's society and the increasing attention paid by the international community to the protection of the natural environment, the demand for low-nitrogen burners has gradually increased. X ) emission requirements are also becoming increasingly stringent, such as low-nitrogen gas burners nitrogen oxides (NO X ) emission requirements are less than 30mg (O2=3.5%), low nitrogen fuel burner nitrogen oxides (NO X ) emission requirement is less than 50mg (O2=3.5%); At present, among the low-nitrogen burners produced in my country, the nitrogen oxides (NO X ) emissions have met national and local standards, but low-nitrogen fuel burners have low nitrogen oxides (NO X ) emissions have not yet reached national and local standards, and we are still working hard to explore and seek better technical solutions to solve this problem. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a low-nitrogen fuel burner capable of recirculating flue gas.

[0004] The technical solution is as follows: a low-nitrogen fuel burner, characterized in that it includes a burner shell, a flame tube, a diffusion disk, an oil nozzle and an ignition needle assembly, a swirler and a center seat assembly, the flame tube is connected to the front end of the burner shell through a rotating flange assembly, and the inner cavities thereof are mutually connected, the center seat assembly is installed at the center of the rotating flange assembly and the inner cavity of the flame tube, the center seat assembly includes a center inner tube, the diffusion disk is installed at the front end of the center inner tube through a center support frame, the oil nozzle and the ignition needle assembly are arranged in the center inner tube, and the front end thereof extends toward the diffusion disk, the swirler It is sleeved on the central inner tube, and a high-voltage ignition transformer, a motor and an oil pump oil circuit system component are installed on the burner shell. The high-voltage ignition transformer is connected to the ignition needle component through a circuit, the motor is connected to the oil pump oil circuit system component, and the oil pump oil circuit system component is connected to the oil nozzle. A flue gas recirculation port is also opened on the side of the burner shell, a combustion air inlet box is provided on the flue gas recirculation port, and a flue gas recirculation interface component is provided on the combustion air inlet box. The flue gas recirculation interface component is connected to the boiler smoke pipe economizer through a port when the smoke temperature at the front is between 120°C and 220°C.

[0005] As a further improvement, a wind pressure switch is also installed on the burner housing, and a flame detector is also installed on the rotating flange assembly.

[0006] As a further improvement, a distribution block assembly is provided on the oil pump oil circuit system assembly, and the distribution block assembly is connected to the oil nozzle through an oil inlet metal hose, an oil inlet control metal hose, an oil return metal hose, and an oil return control metal hose, to ensure that the fuel oil circuit is unobstructed and normally transported to the oil nozzle, thereby ensuring the flow required for the normal operation of the burner.

[0007] As a further improvement, the cyclone is a manually adjustable cyclone.

[0008] As a further improvement, the manually adjustable swirler includes a swirl disk and an adjustment rod, the swirl disk is sleeved on the central inner tube, one end of the adjustment rod is fixed to the swirl disk by a nut, and the other end extends to the connection between the rotating flange assembly and the front end of the burner shell.

[0009] As a further improvement, the swirl disk includes a swirl sleeve, a plurality of first swirl plates and a plurality of second swirl plates, the first swirl plates and the second swirl plates are arranged alternately at an angle of 20° on the outer periphery of the swirl sleeve, swirl holes are provided on the first swirl plates and the second swirl plates, a U-shaped notch is provided on the edge of the first swirl plate, and a detection hole for a flame detector to detect flame signals in the burner is also provided on one of the second swirl plates.

[0010] As a further improvement, the rotating flange assembly is connected to the front end of the burner housing via a rotating shaft and screws.

[0011] As a further improvement, the rotating flange assembly includes a rotating inner cylinder and a rotating upper cover. An adjustment window is provided on the rotating inner cylinder near the front end of the burner shell for the operator to manually adjust the length of the adjustment rod. The rotating upper cover is movably arranged on the adjustment window. Beneficial Effects

[0012] The beneficial effects are: 1. The burner structure can quickly mix the fuel and the primary air to form a fuel-rich mixture in the primary combustion zone in the pre-combustion chamber. Due to lack of oxygen, only part of the fuel is burned, and the fuel releases volatiles in the primary flame zone with low oxygen and flame temperature, thereby reducing the generation of NOx.

[0013] 2. The burner structure can conveniently and quickly adjust the front and rear position relationship of the swirler manually, thereby adjusting the burner flame length.

[0014] 3. When the burner is running, regardless of the fuel adjustment ratio and the amount of smoke added, the burner structure can run smoothly without gasping or vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below with reference to the accompanying drawings and implementation examples.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the overall appearance of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the swirl disk of the present invention.

[0020] Numbers in the figure:

[0021] 1. Flame tube 2. Diffuser 3. Nozzle and ignition needle assembly

[0022] 4. Central support frame 5. Cyclone 501. Cyclone disk

[0023] 5011, swirl sleeve 5012, first swirl sheet 5013, second swirl sheet

[0024] 5014, swirl hole 5015, U-shaped notch 5016, detection hole

[0025] 6. Center seat assembly 601, center inner tube 7, rotating flange assembly

[0026] 8. Burner housing 9. Adjustment rod 10. High-voltage ignition transformer

[0027] 11. Motor and oil pump oil system components 12. Flue gas recirculation interface components

[0028] 13. Combustion air inlet box 14. Air pressure switch 15. Burner control box

[0029] 16. Distribution block assembly 17. Flame detector 18. Oil inlet metal hose

[0030] 19. Control oil inlet metal hose 20. Oil return metal hose

[0031] 21. Control oil return metal hose DETAILED DESCRIPTION

[0032] In order to have a further understanding and recognition of the structural features and the effects achieved by the present invention, a preferred embodiment and accompanying drawings are used for detailed description as follows:

[0033] like Figure 1-3As shown, a low-nitrogen fuel burner includes a burner housing 8, a flame tube 1, a diffusion disk 2, an oil nozzle and ignition needle assembly 3, a swirler 5 and a center seat assembly 6. The flame tube 1 is connected to the front end of the burner housing 8 through a rotating flange assembly 7, and the inner cavities thereof are mutually connected. The front end of the flame tube has a closing opening, and the closing angle is 160° and the closing length is 40 mm. The center seat assembly 6 is installed at the center of the inner cavity of the rotating flange assembly 7 and the flame tube 1. The center seat assembly 6 includes a center inner tube 601. The diffusion disk 2 is installed at the front end of the center inner tube 601 through a center support frame 4. The distance between the diffusion disk 2 and the front end surface of the flame tube 1 is 220 mm. The length of the limit screw on the center support frame 4 can be adjusted during installation to ensure that the center support frame 4 is closed. The center seat assembly 6 is on the central axis of the flame tube 1, thereby ensuring that the oil sprayed from the oil nozzle is sprayed from the central axis of the flame tube 1, ensuring that the flame forms a pre-combustion chamber at the front end of the flame tube and burns first; the oil nozzle and ignition needle assembly 3 are arranged in the central inner tube 601, and its front end extends toward the diffusion disk 2. The swirler 5 is sleeved on the central inner tube, and the distance from its front end face to the end face of the flame tube is temporarily set to 320mm. This distance can be adjusted according to the length of the boiler furnace when the burner is debugged; a high-voltage ignition transformer 10, a motor and an oil pump oil circuit system assembly 11 are installed on the burner housing 8. The high-voltage ignition transformer 10 is connected to the ignition needle assembly through a circuit. When the burner is working, the high voltage is generated by the high-voltage ignition transformer 10 to make the two ignition rods A strong electric spark of 3 to 5 seconds is generated between the two, thereby ensuring that the burner ignition sequence can ignite normally; the motor is connected to the oil pump oil circuit system component, and the oil pump oil circuit system component is connected to the oil nozzle to ensure that the inlet and return oil circuits are normally unobstructed and the oil pressure is adjusted between 20 and 23 bar, thereby ensuring that the burner can operate normally for a long time; a flue gas recirculation port is also opened on the side of the burner housing 8, and a combustion air inlet box 13 is provided on the flue gas recirculation port, and a flue gas recirculation interface component 12 is provided on the combustion air inlet box 13. The flue gas recirculation interface component 12 is connected to the flue gas temperature at the front of the boiler smoke pipe economizer between 120°C and 220°C, thereby ensuring that the burner reaches the required temperature conditions during normal operation. , using the pressure head of the combustion air, part of the combustion flue gas is sucked back and enters the blower. After being fully mixed with the combustion air, it enters the combustion chamber for combustion. Through the opening of the flue gas recirculation interface component 12, about 20%~80% of the flue gas is put in. The heat capacity of the combustion flue gas is large, and the combustion temperature is reduced, thereby reducing the emission of nitrogen oxides NOx. When in use, the combustion air enters from the bottom of the combustion air inlet box component 13, and enters the blower casing together with the flue gas inhaled by the flue gas recirculation interface component 12. Through the high-speed rotation of the blower impeller, under the action of centrifugal force, the flue gas and the combustion air are fully stirred and evenly mixed, and then transported from the blower outlet to the burner pre-combustion chamber to be fully and evenly mixed with the molecules of the high-pressure atomized oil and then burned together.

[0034] The burner control box 15 is installed on one side of the burner housing 8. A wind pressure switch 14 is also installed on the burner housing. When debugging the burner, gradually increase the adjustment value on the air pressure switch (turn the adjustment clockwise) until the burner stops, read the adjustment value (such as 20mbar), and the set value cannot be lower than 80% of the value (such as 16mbar). Set the wind pressure switch parameter value to ensure the normal and safe operation of the burner. A flame detector is also installed on the rotating flange assembly to detect the flame in the burner, thereby ensuring the normal operation of the burner.

[0035] A distribution block assembly 16 is provided on the oil pump oil circuit system assembly, and the distribution block assembly 16 is connected to the oil nozzle through an oil inlet metal hose 18, an oil inlet control metal hose 19, an oil return metal hose 20, and an oil return control metal hose 21, to ensure that the fuel oil circuit is unobstructed and normally transported to the oil nozzle, thereby ensuring the flow required for the normal operation of the burner.

[0036] The cyclone 5 is a manually adjustable cyclone, which includes a cyclone disc 501 and an adjusting rod 9. The cyclone disc 501 is sleeved on the central inner tube 601. One end of the adjusting rod 9 is fixed on the cyclone disc 501 by a nut, and the other end extends to the connection between the rotating flange assembly 7 and the front end of the burner housing 8. The rotating flange assembly 7 is connected to the front end of the burner housing 8 by a rotating shaft and a screw. If the length of the adjusting rod needs to be adjusted, the rotating flange assembly 7 and the burner housing 8 can be separated by unscrewing the rotating shaft and the screw, and then reaching in to adjust the length of the adjusting rod, thereby adjusting the front and rear distance of the cyclone disc; the rotating flange assembly 7 can also include a rotating inner cylinder and a rotating upper cover (not shown in the figure), and an adjusting window for the operator to manually adjust the length of the adjusting rod is opened at the front end of the rotating inner cylinder near the burner housing, and the rotating upper cover is movably arranged on the adjusting window.

[0037] like Figure 4 As shown, the swirl disk 501 includes a swirl sleeve 5011, a plurality of first swirl sheets 5012 and a plurality of second swirl sheets 5013, the first swirl sheets 5012 and the second swirl sheets 5013 are staggered at an angle of 20° on the outer periphery of the swirl sleeve 5011, swirl holes 5014 are provided on the first swirl sheets 5012 and the second swirl sheets 5013, a U-shaped notch 5015 is provided on the edge of the first swirl sheet 5012, and a detection hole 5016 for a flame detector to detect a flame signal in the burner is also provided on one of the second swirl sheets. The manually adjustable cyclone is a radial cyclone. The swirl angle of the swirl plate of the radial cyclone is 20°, the swirl value is 3.2, the tangential velocity on the swirl plate is 40m / s, and its total thickness is 55mm. There is a circular hole with an inner diameter of 20mm in the center of the swirl plate, which can be manually adjusted to any position to meet the flame length suitable for various boiler furnace lengths when debugging the burner.

[0038] The cyclone in the present invention may also be an automatically regulating cyclone.

[0039] Burner operation procedure: Boiler operation condition verification → Large air door furnace purge → Motor oil pump start → Air door runs to ignition position → Ignition transformer works → Oil circuit safety solenoid valve runs → Ignition flame verification (Ignition transformer stops) → Inlet and return oil control solenoid valve runs → Main fire flame verification → Load ratio adjustment → Normal shutdown → Furnace post-purge. In the burner part, through the action of the flow control valve, the fuel can be continuously delivered from small to large to the nozzle to achieve combustion ratio adjustment. The flow ratio control valve is driven by an independent servo motor, the air door adjustment mechanism is driven by an independent servo motor, and the independent servo motor transmission mechanism, plus the three independent servo motors are rotated through the BT340 Lamtek controller to achieve automatic adjustment of the appropriate air-oil ratio to ensure full combustion of the burner fuel.

[0040] In summary, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications to the shape, structure, characteristics and spirit described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A low nitrogen fuel burner, characterized in that: The invention comprises a burner shell, a flame tube, a diffusion disk, an oil nozzle and an ignition needle assembly, a swirler and a center seat assembly, wherein the flame tube is connected to the front end of the burner shell through a rotating flange assembly, and the inner cavities thereof are mutually connected, and the center seat assembly is installed at the center of the inner cavities of the rotating flange assembly and the flame tube, and the center seat assembly comprises a center inner tube, the diffusion disk is installed at the front end of the center inner tube through a center support frame, the oil nozzle and the ignition needle assembly are arranged in the center inner tube, and the front end thereof extends toward the diffusion disk, the swirler is sleeved on the center inner tube, and a high-voltage ignition transformer, a motor and an oil pump oil circuit system assembly are installed on the burner shell, the high-voltage ignition transformer is connected to the ignition needle assembly through a circuit, and the motor is connected to the oil pump oil circuit system assembly The oil pump oil circuit system component is connected to the oil nozzle, and a flue gas recirculation port is also opened on the side of the burner shell, and a combustion air inlet box is provided on the flue gas recirculation port, and a flue gas recirculation interface component is provided on the combustion air inlet box. The flue gas recirculation interface component is connected to the boiler smoke pipe economizer through a port when the smoke temperature at the front is between 120°C and 220°C. The cyclone is a manually adjustable cyclone, and the manually adjustable cyclone includes a cyclone disk and an adjusting rod. The cyclone disk is sleeved on the central inner tube, and one end of the adjusting rod is fixed to the cyclone disk by a nut, and the other end extends to the connection between the rotating flange assembly and the front end of the burner shell, and a wind pressure switch is also installed on the burner shell, and a flame detector is also installed on the rotating flange assembly.

2. A low nitrogen fuel burner according to claim 1, characterized in that: A distribution block assembly is provided on the oil pump oil circuit system assembly, and the distribution block assembly is connected to the oil nozzle through an oil inlet metal hose, an oil inlet control metal hose, an oil return metal hose, and an oil return control metal hose, ensuring that the fuel oil circuit is unobstructed and normally transported to the oil nozzle, thereby ensuring the flow required for the normal operation of the burner.

3. A low nitrogen fuel burner according to claim 1, characterized in that: The swirl disk includes a swirl sleeve, a plurality of first swirl sheets and a plurality of second swirl sheets, the first swirl sheets and the second swirl sheets are staggered at an angle of 20° on the outer periphery of the swirl sleeve, swirl holes are provided on the first swirl sheets and the second swirl sheets, a U-shaped notch is provided on the edge of the first swirl sheet, and a detection hole for a flame detector to detect a flame signal in a burner is also provided on one of the second swirl sheets.

4. A low nitrogen fuel burner according to claim 1, characterized in that: The rotating flange assembly is connected to the front end of the burner housing through a rotating shaft and screws.

5. A low nitrogen fuel burner according to claim 1, characterized in that: The rotating flange assembly includes a rotating inner cylinder and a rotating upper cover. An adjustment window for an operator to manually adjust the length of the adjustment rod is provided on the rotating inner cylinder near the front end of the burner shell, and the rotating upper cover is movably arranged on the adjustment window.

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