Internal circulation structure of low-nitrogen gas burner

Abstract

The utility model discloses an internal circulation structure of a low-nitrogen gas burner, which particularly relates to the field of burners and comprises a gas inlet pipe, one end of the gas inlet pipe is communicated with a flame tube, one end of the flame tube is communicated with an exhaust pipe, the bottom end of the exhaust pipe is communicated with a first conveying pipe, the bottom end of the first conveying pipe is communicated with a sucking pump, and one end of the sucking pump is provided with a mounting frame. An air supply port is formed in one side of the mounting frame, and a filter screen plate is mounted at the air supply port; a plurality of high-temperature-resistant filter bags are mounted in the mounting frame, one side of the mounting frame is communicated with a conveying pipe II, one end of the conveying pipe II is connected with a circulating pipe, and the circulating pipe is communicated with the air inlet pipe. When flue gas exhausted by the exhaust pipe is recycled, the flue gas needs to be primarily filtered by the filter screen plate in the mounting frame, and then dust is filtered by the high-temperature-resistant filter bag, so that impurities in the recycled flue gas are reduced, and the use effect and the service life of a flamethrower in the combustor are prevented from being influenced by the impurities.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to an internal circulation structure for a low-NOx gas burner. Background Technology

[0002] A low-NOx gas burner is a combustion device that can significantly reduce nitrogen oxide (NOx) emissions. Its core principle is to reduce the NOx concentration in the combustion exhaust gas by improving the combustion equipment or controlling combustion conditions. Currently, most traditional burners suffer from incomplete combustion during use. An existing patent, CN202021200232.9, describes an internal circulation structure for a low-NOx gas burner. During operation, an air pump draws the incompletely burned flue gas from the flame ejected from the burner's flame tube into the exhaust pipe, where it is then re-ejected into the internal gas pipe of the burner's flame tube. This solves the problem of incomplete combustion in existing burners.

[0003] When the above-mentioned utility model recycles the incompletely combusted flue gas, the impurities contained in the flue gas are not filtered, which can easily affect the flame-throwing effect of the flamethrower.

[0004] Therefore, we have made improvements and proposed an internal circulation structure for a low-NOx gas burner. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses an internal circulation structure for a low-NOx gas burner, comprising an air inlet pipe, one end of which is connected to a flame tube, one end of which is connected to an exhaust pipe, and one end of which is connected to an outlet pipe. The bottom end of the exhaust pipe is connected to a first delivery pipe, and the bottom end of the first delivery pipe is connected to a vacuum pump. One end of the vacuum pump is fitted with an installation frame, and one side of the installation frame has an air inlet. A filter screen is installed at the air inlet, and the air inlet is connected to the outlet of the vacuum pump. Multiple high-temperature resistant filter bags are installed inside the installation frame, and one side of the installation frame is connected to a second delivery pipe. One end of the second delivery pipe is connected to a circulation pipe, and the circulation pipe is connected to the air inlet pipe.

[0007] As a preferred embodiment of this utility model, an installation plate is fixedly installed inside the installation frame, and multiple installation grooves are evenly and continuously formed on the installation plate.

[0008] As a preferred embodiment of this utility model, a support frame is installed at the mounting groove, the high-temperature resistant filter bag is installed on the support frame, and the top of the high-temperature resistant filter bag is located on the top surface of the mounting plate, and a sealing strip is provided between the high-temperature resistant filter bag and the mounting plate.

[0009] As a preferred technical solution of this utility model, the bottom end of the mounting frame is provided with a dust collection port, the second conveying pipe is installed on the side of the mounting frame and is located at the top of the mounting plate, and the air supply port is located at the bottom of the high-temperature resistant filter bag.

[0010] As a preferred embodiment of this utility model, a plurality of purge pipes are evenly installed on the inner top surface of the mounting frame, a connecting frame is installed on the outer top surface of the mounting frame, and the purge pipes are connected to the connecting frame, and a fan is installed on the top surface of the connecting frame.

[0011] As a preferred embodiment of this utility model, solenoid valves are installed in the exhaust pipe, the first conveying pipe, the second conveying pipe, and the circulation pipe.

[0012] The beneficial effects of this utility model are:

[0013] In this invention, when the flue gas discharged from the exhaust pipe is recycled, it must first pass through the filter screen plate in the installation frame for preliminary filtration, and then pass through the high-temperature resistant filter bag to filter the dust, thereby reducing impurities in the recycled flue gas and preventing impurities from affecting the performance and service life of the burner in the burner. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the internal circulation structure of a low-NOx gas burner according to this utility model. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the internal circulation structure of a low-NOx gas burner according to this utility model. Figure 2 ;

[0017] Figure 3 This is a schematic diagram of the internal circulation structure of a low-NOx gas burner according to this utility model. Figure 3 ;

[0018] Figure 4 This is a schematic diagram of the internal circulation structure of a low-NOx gas burner according to this utility model. Figure 4 .

[0019] In the diagram: 1. Inlet pipe; 2. Circulation pipe; 3. Flame tube; 4. Exhaust pipe; 5. Conveying pipe one; 6. Outlet pipe; 7. Air pump; 8. Conveying pipe two; 9. Fan; 10. Mounting frame; 11. Mounting plate; 12. High-temperature resistant filter bag; 13. Support frame; 14. Mounting groove; 15. Ash collection port; 16. Connecting frame; 17. Air inlet; 18. Purge pipe; 19. Filter screen. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example: Figures 1 to 4 As shown, the internal circulation structure of a low-NOx gas burner of this utility model includes an intake pipe 1, one end of which is connected to a flame tube 3, and the other end of the flame tube 3 is connected to an exhaust pipe 4. An existing continuous emission monitoring system (CEMS) is deployed in the exhaust pipe 4 to track changes in CO, NOx, and O concentrations in real time. When the CO concentration suddenly increases or the O content suddenly decreases, an alarm is triggered, indicating that unburned gas has entered the system. At this time, the flue gas emitted from the exhaust pipe 4 needs to be recycled. The CEMS is existing technology, and its specific structure and working principle will not be described in detail here. One end of the exhaust pipe 4 is connected to an outlet pipe 6. When the CEMS detects that the changes in CO, NOx, and O concentrations are within the normal range, the flue gas is emitted through the outlet pipe 6. The emitted flue gas needs to be treated by existing technology to meet emission standards. The specific treatment method is existing technology and will not be described in detail here.

[0022] The bottom end of the exhaust pipe 4 is connected to the conveying pipe 5, and the bottom end of the conveying pipe 5 is connected to the suction pump 7. One end of the suction pump 7 is equipped with an installation frame 10. An air inlet 17 is opened on one side of the installation frame 10. A filter screen 19 is installed at the air inlet 17, and the air inlet 17 is connected to the outlet of the suction pump 7. When it is necessary to recover and re-burn the incompletely burned flue gas, the flue gas is drawn from the conveying pipe 5 into the installation frame 10 by the suction pump 7. The suction pump 7 is a special suction pump for flue gas. The flue gas passes through the filter screen 19 and enters the installation frame 10, which can perform preliminary filtration of impurities in the flue gas.

[0023] Multiple high-temperature resistant filter bags 12 are installed inside the mounting frame 10. The high-temperature resistant filter bags 12 are made of PTFE. The high-temperature resistant filter bags 12 can further remove dust from the flue gas entering the mounting frame 10. A conveying pipe 2 8 is connected to one side of the mounting frame 10. One end of the conveying pipe 2 8 is connected to a circulation pipe 2, and the circulation pipe 2 is connected to the air inlet pipe 1. An air pump 7 (not shown in the figure) can be installed on the conveying pipe 2 8. The air pump 7 can accelerate the flue gas to enter the circulation pipe 2 and then enter the air inlet pipe 1 for re-combustion.

[0024] An installation plate 11 is fixedly installed inside the mounting frame 10. Multiple mounting slots 14 are evenly and continuously opened on the mounting plate 11. A support frame 13 is installed at the mounting slot 14. The high-temperature resistant filter bag 12 is installed on the support frame 13, and the top of the high-temperature resistant filter bag 12 is located on the top surface of the mounting plate 11. A sealing strip is provided between the high-temperature resistant filter bag 12 and the mounting plate 11. The sealing strip is a high-temperature resistant sealing strip. The support frame 13 supports and installs the high-temperature resistant filter bag 12. Both the sealing strip and the support frame 13 are installed using existing technology.

[0025] The bottom of the mounting frame 10 is provided with a dust collection port 15, the second conveying pipe 8 is installed on the side of the mounting frame 10, and the second conveying pipe 8 is located on the top of the mounting plate 11. The air supply port 17 is located at the bottom of the high temperature resistant filter bag 12.

[0026] Multiple purge pipes 18 are evenly installed on the inner top surface of the mounting frame 10. A connecting frame 16 is installed on the outer top surface of the mounting frame 10, and the purge pipes 18 are connected to the connecting frame 16. A fan 9 is installed on the top surface of the connecting frame 16. When it is necessary to clean the high-temperature resistant filter bag 12, air can be blown into the connecting frame 16 by the fan 9. The air enters the mounting frame 10 through the purge pipes 18 and is aimed at the high-temperature resistant filter bag 12. The falling dust enters the dust collection port 15. An existing electric control valve can be installed at the bottom of the mounting frame 10. The electric control valve is opened during dust cleaning to facilitate dust cleaning. At other times, the electric control valve is closed. An inspection port can also be opened on the mounting frame 10. The high-temperature resistant filter bag 12 can be taken out for cleaning or replacement through the inspection port. The inspection port is opened according to the existing technology and an existing sealing baffle is installed. The specific details are not described here.

[0027] Solenoid valves are installed in exhaust pipe 4, conveying pipe 1 5, conveying pipe 2 8, and circulation pipe 2. If the flue gas needs to be discharged directly, the solenoid valve at exhaust pipe 4 is opened and the solenoid valve on conveying pipe 1 5 is closed. If the flue gas needs to be recovered and re-combusted, the solenoid valve on exhaust pipe 4 is closed and the solenoid valves in conveying pipe 1 5, conveying pipe 2 8, and circulation pipe 2 are all opened. If the high-temperature resistant filter bag 12 needs to be cleaned, the solenoid valves in conveying pipe 2 8 and conveying pipe 1 5 are all closed.

[0028] During operation, when the flue gas discharged from the exhaust pipe 4 is recycled, it must first pass through the filter screen plate 19 in the mounting frame 10 for preliminary filtration, and then pass through the high-temperature resistant filter bag 12 to filter the dust, thereby reducing impurities in the recycled flue gas and preventing impurities from affecting the performance and service life of the burner in the burner.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An internal circulation structure for a low-NOx gas burner, comprising an intake pipe (1), one end of which is connected to a flame tube (3), one end of which is connected to an exhaust pipe (4), and one end of the exhaust pipe (4) is connected to an outlet pipe (6), characterized in that, The bottom end of the exhaust pipe (4) is connected to a first conveying pipe (5), and the bottom end of the first conveying pipe (5) is connected to a vacuum pump (7). One end of the vacuum pump (7) is equipped with an installation frame (10), and an air inlet (17) is opened on one side of the installation frame (10). A filter screen (19) is installed at the air inlet (17), and the air inlet (17) is connected to the outlet of the vacuum pump (7). Multiple high-temperature resistant filter bags (12) are installed inside the installation frame (10), and one side of the installation frame (10) is connected to a second conveying pipe (8). One end of the second conveying pipe (8) is connected to a circulation pipe (2), and the circulation pipe (2) is connected to the air inlet pipe (1).

2. A low-nitrogen gas combustor according to claim 1, wherein An installation plate (11) is fixedly installed inside the installation frame (10), and multiple installation slots (14) are evenly opened on the installation plate (11).

3. A low-nitrogen gas combustor according to claim 2, wherein A support frame (13) is installed in the mounting groove (14), the high temperature resistant filter bag (12) is installed on the support frame (13), and the top of the high temperature resistant filter bag (12) is located on the top surface of the mounting plate (11), and a sealing strip is provided between the high temperature resistant filter bag (12) and the mounting plate (11).

4. The inner circulation structure of a low-nitrogen gas burner according to claim 1, characterized in that, The bottom end of the mounting frame (10) is provided with a dust collection port (15), the second conveying pipe (8) is installed on the side of the mounting frame (10), and the second conveying pipe (8) is located on the top of the mounting plate (11), and the air supply port (17) is located at the bottom of the high temperature resistant filter bag (12).

5. The inner loop structure of a low-nitrogen gas burner according to claim 1, characterized in that, Multiple purge pipes (18) are evenly installed on the inner top surface of the mounting frame (10), and a connecting frame (16) is installed on the outer top surface of the mounting frame (10). The purge pipes (18) are connected to the connecting frame (16), and a fan (9) is installed on the top surface of the connecting frame (16).

6. The inner loop structure of a low-nitrogen gas burner according to claim 1, characterized in that, Solenoid valves are installed in the exhaust pipe (4), the first delivery pipe (5), the second delivery pipe (8), and the circulation pipe (2).

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