An industrial low nitrogen burner

Abstract

The present application relates to the field of burners, and in particular to a high-efficiency industrial low-nitrogen burner, which includes a metal nozzle and a flame diffusion refractory brick. The metal nozzle is a cylindrical structure, a swirl disk is arranged in one end of the metal nozzle, an inner cavity is arranged in the flame diffusion refractory brick, the metal nozzle is sleeved and fixed in the flame diffusion refractory brick, the inner cavity of the flame diffusion refractory brick is flared, and the end with a smaller opening is close to the metal nozzle, and a gas flow main pipe is also fixed on the metal nozzle, the gas flow main pipe is a tubular structure with one end closed, the cross-sectional diameter of the gas flow main pipe is smaller than the cross-sectional diameter of the metal nozzle, and a plurality of radial fuel holes are opened around the peripheral wall of the gas flow main pipe in the metal nozzle, and an ignition electrode and an ignition fuel inlet pipe are also arranged on the metal nozzle. The present application has the effect of effectively improving the problem of polluted gas emissions during the operation of the burner.

Description

Technical Field

[0001] The present application relates to the field of burners, and in particular to an industrial low-nitrogen burner. Background Art

[0002] A large number of burners are used in the production process of domestic and foreign industrial fields. Currently, combustion equipment faces two major challenges: one is to gradually reduce the CO and NOx emissions in the flue gas after the burner is burned; the other is to require the burner to be more widely applicable to on-site operating conditions and meet energy-saving requirements.

[0003] At present, most of the metal smelting fields at home and abroad use gas burners, such as steel, nonferrous metallurgy and other industries. There is still a lot of room for improvement in pollutant emissions and energy saving. Affected by the gas pressure and different on-site working conditions, some burners use the method of mixing gas and air into the furnace, which is easy to cause the flame temperature to be too high and cause a large amount of NOx emissions; another part of the burners use the method of pre-mixing gas and air, and use metal wire mesh as the flame carrier for combustion, which is easy to cause poor flame stability and cause large CO emissions. Summary of the invention

[0004] In order to effectively improve the problem of polluted gas emissions during the operation of the burner, the present application provides an industrial low-nitrogen burner.

[0005] The industrial low nitrogen burner provided in this application adopts the following technical solution:

[0006] An industrial low-nitrogen burner comprises a metal nozzle and a flame diffusion refractory brick, wherein the metal nozzle is a cylindrical structure with openings at both ends, a swirl disk for dispersing airflow is arranged in one end of the metal nozzle, an inner cavity penetrating two opposite end surfaces of the flame diffusion refractory brick is arranged in the flame diffusion refractory brick, the other end of the metal nozzle is sleeved and fixed in the flame diffusion refractory brick, the inner cavity of the flame diffusion refractory brick is flared, and the end with a smaller opening is close to the metal nozzle, and a gas flow main pipe is also penetrated and fixed on the metal nozzle, the gas flow main pipe is a tubular structure closed at one end, the cross-sectional diameter of the gas flow main pipe is smaller than the cross-sectional diameter of the metal nozzle, the closed end of the gas flow main pipe is located in the metal nozzle and extends in a direction close to the flame diffusion refractory brick, a plurality of radial fuel holes are opened around the peripheral wall of the gas flow main pipe located in the metal nozzle, an ignition electrode and an ignition fuel inlet pipe are also arranged on the metal nozzle, the ignition fuel inlet pipe is located next to the ignition electrode, and the ignition fuel inlet pipe and the ignition electrode are both located on the side of the radial fuel hole close to the flame diffusion refractory brick.

[0007] By adopting the above technical solution, air is evenly dispersed into the metal nozzle through the swirl disk, and the gas is dispersed into the metal nozzle through the gas flow main pipe and the radial fuel holes, and the gas and air are evenly mixed; the gas enters the vicinity of the ignition electrode through the ignition fuel inlet pipe and is ignited by the ignition electrode, thereby smoothly igniting the entire mixed gas; compared with related technologies, the mixing of air and gas is enhanced, making the mixing more uniform, improving the combustion efficiency, and thus reducing the emission of pollutant gases.

[0008] Optionally, an adjustment dial for adjusting the flame diffusion angle is installed at the closed end of the gas flow main pipe.

[0009] By adopting the above technical solution, the staff can adjust the dial to change the flame diffusion angle to adapt to different types of gas and working conditions.

[0010] Optionally, the adjustment dial includes a dial portion, an insertion rod portion and a positioning screw, the dial portion is in the shape of a disc, the diameter of the dial portion is larger than the cross-sectional diameter of the closed end of the gas flow main pipe, the insertion rod portion is vertically fixed to a side of the dial portion close to the gas flow main pipe, the insertion rod portion is movably inserted through the closed end of the gas flow main pipe, and the positioning screw is inserted through the dial portion and is threadedly connected to the closed end of the gas flow main pipe.

[0011] By adopting the above technical solution, the staff can control the distance between the rotary disk and the closed end of the gas flow main pipe by turning the positioning screw, thereby changing the flame spraying angle and range.

[0012] Optionally, a fire-viewing tube is provided outside the flame-diffusion refractory brick, and the fire-viewing tube is connected to the inner cavity of the flame-diffusion refractory brick.

[0013] By adopting the above technical solution, the staff can visually check whether the burner is spraying flames normally through the fire viewing tube.

[0014] Optionally, a flame detector is disposed outside the flame diffusion refractory brick, and the flame detector is connected to the inner cavity of the flame diffusion refractory brick.

[0015] By adopting the above technical solution, the staff can know whether the burner is spraying flame normally through the signal output by the flame detector.

[0016] Optionally, a pressure measuring tube is provided on the side wall of the metal nozzle, and the pressure measuring tube is connected to the inner cavity of the metal nozzle.

[0017] By adopting the above technical solution, the pressure measuring tube can help the staff to know the gas pressure in the metal nozzle.

[0018] Optionally, the metal nozzle includes a first connecting tube, a second connecting tube and a contraction tube, the diameter of the first connecting tube is larger than the diameter of the second connecting tube, the contraction tube is funnel-shaped, the end of the contraction tube with a larger opening is sealed connected to the first connecting tube, the end of the contraction tube with a smaller opening is sealed connected to the second connecting tube, the swirl disk is located in the first connecting tube, the flame diffusion refractory bricks are installed on the second connecting tube, and the radial fuel hole is located in the second connecting tube.

[0019] By adopting the above technical solution, the reduced diameter in the middle of the metal nozzle facilitates the increase of gas flow rate, enhances the mixing effect and improves the flame rigidity.

[0020] Optionally, a mounting flange is fixedly mounted on the second connecting tube, and a plurality of connecting screws are fixedly connected to one end of the flame diffusion refractory brick close to the mounting flange. The connecting screws are detachably mounted on the mounting flange, and connecting nuts for fixing the mounting flange are also threadedly connected to the connecting screws.

[0021] By adopting the above technical solution, the installation and disassembly of the flame diffusion refractory bricks and the metal nozzles are facilitated.

[0022] Optionally, a heat insulating pad is provided between the flame diffusion refractory brick and the mounting flange.

[0023] By adopting the above technical solution, the heat transferred from the flame diffusion refractory bricks to the mounting flange can be effectively blocked.

[0024] Optionally, a connecting flange is provided at one end of the first connecting tube away from the shrinking tube.

[0025] By adopting the above technical solution, it is convenient to connect the burner to an external blower.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The air is evenly dispersed into the metal nozzle through the swirl disk, and the gas is dispersed into the metal nozzle through the gas flow main pipe and radial fuel holes, and the gas and air are evenly mixed; the gas enters the vicinity of the ignition electrode through the ignition fuel inlet pipe and is ignited by the ignition electrode, thereby smoothly igniting the entire mixed gas; compared with related technologies, the mixing of air and gas is strengthened, making the mixing more uniform, improving the combustion efficiency, and thus reducing the emission of polluting gases;

[0028] 2. The staff can control the distance between the rotating disk and the closed end of the gas flow pipe by turning the positioning screw, thereby changing the flame spray angle and range;

[0029] 3. The reduced diameter in the middle of the metal nozzle facilitates the increase of gas flow rate, enhances the mixing effect and improves the flame rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an industrial low-nitrogen burner according to an embodiment of the present application.

[0031] Figure 2 This is a cross-sectional view of an industrial low nitrogen burner according to an embodiment of the present application. Figure 1 .

[0032] Figure 3 This is a cross-sectional view of an industrial low nitrogen burner according to an embodiment of the present application. Figure 2 .

[0033] Explanation of the reference numerals: 1. Metal nozzle; 10. First connecting tube; 100. Pressure measuring tube; 11. Second connecting tube; 12. Contraction tube; 13. Mounting flange; 14. Connecting flange; 2. Flame diffusion refractory brick; 20. Connecting screw; 21. Connecting nut; 22. Insulation pad; 3. Swirl disk; 4. Gas flow main pipe; 40. Mounting pipe; 41. Extension pipe; 410. Radial fuel hole; 42. Solid column; 420. Make way hole; 5. Ignition electrode; 6. Ignition fuel inlet pipe; 7. Fire viewing tube; 8. Flame detector; 9. Adjustment dial; 90. Disc part; 900. Countersunk hole; 91. Rod insertion part; 92. Positioning screw. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] The present application embodiment discloses an industrial low nitrogen burner. Figure 1 An industrial low-nitrogen burner comprises a metal nozzle 1, which comprises a first connecting tube 10, a second connecting tube 11 and a shrinking tube 12 which are coaxially arranged; the cross-sectional diameter of the first connecting tube 10 is larger than the cross-sectional diameter of the second connecting tube 11, and a pressure measuring tube 100 is vertically fixedly connected to the peripheral wall of the first connecting tube 10, and the pressure measuring tube 100 is connected to the inside of the first connecting tube 10 for detecting air pressure; the shrinking tube 12 is located between the first connecting tube 10 and the second connecting tube 11, and the shrinking tube 12 is funnel-shaped, and the end with a larger opening of the shrinking tube 12 is sealed and welded to the first connecting tube 10, and the end with a smaller opening of the shrinking tube 12 is sealed and welded to the second connecting tube 11, and the gas enters the second connecting tube 11 from the first connecting tube 10 through the shrinking tube 12, and the flow rate increases, which can effectively improve the flame intensity; a mounting flange 13 is welded on the second connecting tube 11, and a connecting flange 14 is coaxially welded on the end of the first connecting tube 10 away from the shrinking tube 12.

[0036] Reference Figure 1 and Figure 2A flame diffusion refractory brick 2 is arranged on the side of the mounting flange 13 away from the second connecting tube 11. The flame diffusion refractory brick 2 is made of high temperature resistant material and is cylindrical. The flame diffusion refractory brick 2 in this embodiment is made of aluminum silicate refractory material. An inner cavity penetrating two end faces is arranged in the flame diffusion refractory brick 2 along its own axial direction. The inner cavity is flared. The flaring angle can be selected from any angle of 5° to 15° according to actual needs, such as 5°. The length of the flame diffusion refractory brick 2 can be selected from any length of 30 to 45 mm according to actual needs, such as 30 mm, so that the flame shape and flame rigidity can be controlled; the end of the flame diffusion refractory brick 2 with a smaller inner cavity opening It faces the mounting flange 13 and can be detachably sleeved on the second connecting tube 11; a plurality of connecting screws 20 are pre-buried at one end of the flame diffusion refractory brick 2 close to the mounting flange 13, the connecting screws 20 are detachably penetrated through the mounting flange 13, and a connecting nut 21 is threadedly connected to the connecting screw 20, and the connecting nut 21 is pressed against the side of the mounting flange 13 away from the flame diffusion refractory brick 2; in order to prevent heat from being conducted from the flame diffusion refractory brick 2 to the mounting flange 13, a thermal insulation pad 22 is further arranged between the flame diffusion refractory brick 2 and the mounting flange 13, the connecting screws 20 are penetrated through the thermal insulation pad 22, the thermal insulation pad 22 in this embodiment is a high temperature resistant asbestos gasket, and can also be a graphite gasket in other examples.

[0037] Reference Figure 1 and Figure 3A swirl disk 3 is fixedly connected to the end of the first connecting tube 10 away from the contraction tube 12. The swirl disk 3 includes a plurality of blades. The number of blades can be selected from 6 to 12 according to actual needs, for example, 6. The swirl angle of the blades can be selected from 25° to 60° according to actual needs, for example, 25°, so that the air intake can be controlled; the connecting flange 14 is externally connected to the blower, and the air forms a swirl after passing through the swirl disk 3 and enters the metal nozzle 1; a gas flow main pipe 4 for conveying gas is also installed on the metal nozzle 1, and the gas flow main pipe 4 includes a mounting pipe 40, an extension pipe 41 and a solid column 42; the mounting pipe 40 is passed through and welded to the first connecting tube 10, and the axial direction of the mounting pipe 40 is perpendicular to the axial direction of the first connecting tube 10, and an external thread is provided on the peripheral wall of the exposed end of the mounting pipe 40 to facilitate external connection to the gas pipeline; the extension pipe 41 is the same The shaft is arranged inside the metal nozzle 1, one end of the extension tube 41 extends into the second connecting tube 11, the other end of the extension tube 41 is vertically fixed to the mounting tube 40, and an arc transition is arranged at the connection, and a plurality of radial fuel holes 410 are arranged around the peripheral wall of the extension tube 41 located in the second connecting tube 11, and the plurality of radial fuel holes 410 are evenly distributed, and the number of the radial fuel holes 410 can be selected from any one of 6 to 12, and the diameter of the radial fuel holes 410 can be selected from any one of 8 to 12 mm, so that the amount of gas can be controlled according to actual needs; the gap between the solid column 42 and the second connecting tube 11 can be controlled between 10 and 25 mm, and the solid column 42 is fixed to one end of the extension tube 41 away from the mounting tube 40, thereby closing the extension tube 41, so that the gas enters the second connecting tube 11 from the radial fuel holes 410 and mixes with the air.

[0038] Reference Figure 1 and Figure 3 An ignition electrode 5 is fixedly connected to the peripheral wall of the second connecting tube 11, and the ignition end of the ignition electrode 5 extends into the second connecting tube 11 and is located between the radial fuel hole 410 and the flame diffusion refractory brick 2; in order to facilitate the smooth ignition of the mixed gas, an ignition fuel inlet pipe 6 is also fixedly connected to the peripheral wall of the second connecting tube 11, the ignition fuel inlet pipe 6 is connected to the second connecting tube 11, and the ignition fuel inlet pipe 6 is located near the ignition electrode 5, so as to facilitate rapid ignition; a part of the gas enters the second connecting tube 11 through the gas flow main pipe 4, mixes with the air, and is used for combustion; and the other part of the gas enters the second connecting tube 11 through the ignition fuel inlet pipe 6 for ignition, and the ignition fuel inlet pipe 6 is closed after the ignition is successful.

[0039] Reference Figure 1 and Figure 3A fire observation tube 7 and a flame detector 8 are fixedly connected to the mounting flange 13, and both the fire observation tube 7 and the flame detector 8 are located on the side of the mounting flange 13 away from the flame diffusion refractory brick 2; the flame detector 8 is electrically connected to the external monitoring system; accordingly, a through hole corresponding to the fire observation tube 7 and the flame detector 8 is respectively opened on the side wall of the flame diffusion refractory brick 2, and the staff can check whether the ignition is successful through the fire observation tube 7 with the naked eye, or automatically detect whether the ignition is successful through the flame detector 8.

[0040] Reference Figure 2 and Figure 3 In order to facilitate the staff to adjust the burner performance according to the type of gas and the application occasion, an adjustment dial 9 is installed at the end of the solid column 42 away from the extension tube 41, and a clearance hole 420 is provided at the end of the solid column 42 away from the extension tube 41, and the clearance hole 420 is coaxially arranged with the solid column 42; the adjustment dial 9 includes a dial portion 90, a rod portion 91 and a positioning screw 92; the dial portion 90 is disc-shaped, the diameter of the dial portion 90 is larger than the cross-sectional diameter of the solid column 42 and smaller than the inner diameter of the second connecting tube 11, and the height range of the disc portion 90 protruding from the solid column 42 is 3 to 10 mm After the flame hits the rotary disk part 90, it is dispersed and sprayed in all directions; the insertion rod part 91 is coaxially fixed to the side of the rotary disk part 90 close to the solid column 42, the length of the insertion rod part 91 is less than the length of the make way hole 420, and the insertion rod part 91 is movably inserted into the make way hole 420; three countersunk holes 900 are evenly opened on the rotary disk part 90 around the center of the rotary disk part 90, and the positioning screws 92 are inserted into the countersunk holes 900 and are threadedly connected to the solid column 42. The staff can screw the positioning screws 92 to adjust the distance between the rotary disk part 90 and the solid column 42, thereby changing the flame spraying angle and range.

[0041] The implementation principle of an industrial low-nitrogen burner in an embodiment of the present application is as follows: the outside air forms a swirl after passing through the swirl disk 3, so that the air is evenly dispersed into the metal nozzle 1, and the gas is introduced into the gas flow main pipe 4, and the gas is discharged through the radial fuel hole 410 and evenly mixed with the air; the gas is introduced into the ignition fuel inlet pipe 6, and the gas is ignited through the ignition electrode 5, so that the mixed gas of the gas and air inside the metal nozzle 1 is ignited and sprayed out through the flame diffusion refractory brick 2, and then the ignition fuel inlet pipe 6 is closed; the flame spraying amount and angle can be adjusted by screwing the positioning screw 92, which can adapt to different types of gas and working conditions; the staff can detect whether the burner is spraying flame normally through the fire viewing tube 7 or the flame detector 8; after passing through the internal structure of the burner, the flame has strong rigidity and good stability, and the air and gas are more evenly mixed, thereby improving the combustion efficiency, forming a semi-premixed and semi-diffusion flame, reducing the flame temperature, and thus reducing the emission of nitrogen oxides.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An industrial low nitrogen burner, characterized in that: The invention comprises a metal nozzle (1) and a flame diffusion refractory brick (2), wherein the metal nozzle (1) is a cylindrical structure with openings at both ends, a swirl disk (3) for dispersing airflow is arranged in one end of the metal nozzle (1), an inner cavity penetrating two opposite end surfaces of the flame diffusion refractory brick (2) is arranged in the inner cavity of the metal nozzle (1), and the inner cavity of the flame diffusion refractory brick (2) is in an expanded shape, and the end with a smaller opening is close to the metal nozzle (1). The metal nozzle (1) is provided with a gas flow main pipe (4) fixed thereon, the gas flow main pipe (4) being a tubular structure with one end closed, the cross-sectional diameter of the gas flow main pipe (4) being smaller than the cross-sectional diameter of the metal nozzle (1), the closed end of the gas flow main pipe (4) being located inside the metal nozzle (1) and extending in a direction close to the flame diffusion refractory brick (2), and a plurality of radial fuel holes (41) being arranged around the peripheral wall of the gas flow main pipe (4) located inside the metal nozzle (1) 0), the metal nozzle (1) is also provided with an ignition electrode (5) and an ignition fuel inlet pipe (6), the ignition fuel inlet pipe (6) is located next to the ignition electrode (5), the ignition fuel inlet pipe (6) and the ignition electrode (5) are both located on the side of the radial fuel hole (410) close to the flame diffusion refractory brick (2), and the closed end of the gas flow main pipe (4) is equipped with an adjustment disc (9) for adjusting the flame diffusion angle, and the adjustment disc (9) includes a disc portion (90 ), an inserting rod portion (91) and a positioning screw (92), the disc portion (90) being disc-shaped, the diameter of the disc portion (90) being larger than the cross-sectional diameter of the closed end of the gas flow main pipe (4), the inserting rod portion (91) being vertically fixed to a side of the disc portion (90) close to the gas flow main pipe (4), the inserting rod portion (91) being movably inserted through the closed end of the gas flow main pipe (4), and the positioning screw (92) being inserted through the disc portion (90) and being threadedly connected to the closed end of the gas flow main pipe (4).

2. An industrial low nitrogen burner according to claim 1, characterized in that: A fire-viewing tube (7) is arranged outside the flame-diffusion refractory brick (2), and the fire-viewing tube (7) is connected to the inner cavity of the flame-diffusion refractory brick (2).

3. An industrial low nitrogen burner according to claim 1, characterized in that: A flame detector (8) is arranged outside the flame diffusion refractory brick (2), and the flame detector (8) is connected to the inner cavity of the flame diffusion refractory brick (2).

4. An industrial low nitrogen burner according to claim 1, characterized in that: A pressure measuring tube (100) is arranged on the side wall of the metal nozzle (1), and the pressure measuring tube (100) is connected to the inner cavity of the metal nozzle (1).

5. An industrial low nitrogen burner according to any one of claims 1 to 4, characterized in that: The metal nozzle (1) comprises a first connecting tube (10), a second connecting tube (11) and a shrinking tube (12); the diameter of the first connecting tube (10) is larger than the diameter of the second connecting tube (11); the shrinking tube (12) is funnel-shaped; the end of the shrinking tube (12) with a larger opening is sealed to the first connecting tube (10); the end of the shrinking tube (12) with a smaller opening is sealed to the second connecting tube (11); the swirl disk (3) is located in the first connecting tube (10); the flame diffusion refractory brick (2) is installed on the second connecting tube (11); and the radial fuel hole (410) is located in the second connecting tube (11).

6. An industrial low nitrogen burner according to claim 5, characterized in that: A mounting flange (13) is sleeved and fixed on the second connecting tube (11); a plurality of connecting screws (20) are fixedly connected to one end of the flame diffusion refractory brick (2) close to the mounting flange (13); the connecting screws (20) are detachably inserted into the mounting flange (13); and connecting nuts (21) for fixing the mounting flange (13) are also threadedly connected to the connecting screws (20).

7. An industrial low nitrogen burner according to claim 6, characterized in that: A heat insulation pad (22) is arranged between the flame diffusion refractory brick (2) and the mounting flange (13).

8. An industrial low nitrogen burner according to claim 7, characterized in that: A connecting flange (14) is provided at one end of the first connecting tube (10) away from the shrinking tube (12).

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