High-speed low-nitrogen burner

Abstract

The utility model belongs to the technical field of burners, and particularly discloses a high-speed low-nitrogen burner which comprises an air shell, a gas pipe, a burning head and a burner nozzle, the gas pipe is arranged in the center of the air shell, the gas inlet end of the gas pipe extends out of the air shell, the burning head is arranged at the gas outlet end of the gas pipe, and the burner nozzle is arranged on the side, close to the burning head, of the air shell. A nozzle is formed in the end, away from the air shell, of the burner nozzle, an inner cavity is formed in the burner nozzle, the combustion head is arranged in the inner cavity, fuel gas and a small amount of air can be mixed through the combustion head to form an oxygen-deficient state, incomplete combustion is carried out in the oxygen-deficient state, the combustion temperature can be lowered, and NOx generation can be reduced. Incomplete combustion enters the inner cavity through the gas outlet and is mixed with excessive air in the inner cavity for combustion, the mixed gas can be fed into the hearth for combustion, CO can be converted into CO2, and NOx and CO generated during combustion of the burner can be efficiently and reliably reduced only through the combination of three simple structures.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a high-speed low-nitrogen burner. Background Art

[0002] Burner is the common name for the combustion device used in industrial fuel furnaces, which can be understood as the abbreviation of "fire nozzle". It usually refers to the main body of the combustion device, which has a fuel inlet, an air inlet and an ejection hole, which plays the role of distributing fuel and combustion-supporting air and ejecting them in a certain way for combustion. Under high-temperature combustion conditions, the N2 in the air is oxidized to generate NOx, which mainly exists in the form of NO. NO accounts for about 95% of the initial NOx emissions. The direct exhaust of NOx will cause great damage to the environment; therefore, the burner needs to use methods to change the combustion conditions to reduce NOx emissions, so that low-nitrogen combustion of the burner is the performance indicator pursued by the burner, and the existing burners have NOx emissions during combustion. The main way is to reduce the combustion temperature. However, the temperature of burner combustion can reduce the generation of NOx, but a large amount of CO will be generated. The emission of CO into the atmosphere has a greater impact on humans. Therefore, the generation of CO needs to be solved. In order to reduce the generation of CO, excess air is introduced to burn incomplete combustion products such as CO. When the burner system needs to achieve low NOx and low CO emissions during combustion, it is necessary to add a NOx removal device and a CO removal device inside the burner system, which will make the overall structure of the burner complicated and cannot achieve a rapid reduction in the generation of NOx and CO during burner combustion. Utility Model Content

[0003] In order to overcome the defects of the prior art, the utility model provides a high-speed low-nitrogen burner.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a high-speed low-nitrogen burner, comprising an air shell, a gas pipe, a burner head and a burner nozzle, wherein a gas pipe is arranged at the center of the air shell, an air inlet end of the gas pipe extends out of the air shell, a burner head is arranged at the air outlet end of the gas pipe, a burner nozzle is arranged on the side of the air shell close to the burner head, a nozzle is arranged at the end of the burner nozzle away from the air shell, an inner cavity is arranged inside the burner nozzle, and the burner head is arranged inside the inner cavity.

[0005] Further description of the present scheme: an air inlet is provided at one end of the burner head close to the gas pipe, the burner head is connected to the gas pipe through the air inlet, the diameter of the air inlet of the burner head is smaller than the diameter of the outlet end of the gas pipe, a plurality of first air inlet holes and a plurality of second air inlet holes are provided on the outer surface of the burner head, an air outlet is provided at the other end of the burner head, a baffle is provided at the air outlet, and a plurality of ventilation holes are provided inside the baffle.

[0006] Specifically, the shape of the burner head is convex, and the burner head gradually narrows from the air outlet to the air inlet. The first air inlet hole is opened at the narrowed part of the outer surface of the burner head, and the second air inlet hole is set at the central axis of the outer surface of the burner head.

[0007] More specifically, a mixing chamber is provided inside the burner head, and an ignition electrode is provided inside the mixing chamber.

[0008] Further description of this solution: an air intake passage is arranged on the upper part of the air shell, the air intake passage is communicated with the air shell, an air inlet is opened at one end of the air intake passage away from the air shell, and an air hole plate is arranged at the air inlet.

[0009] Further description of this solution: a connecting flange is provided between the air shell and the burner nozzle, and the air shell is connected to the burner nozzle through the connecting flange.

[0010] Preferably, a gas orifice plate is provided at the inlet end of the gas pipe.

[0011] The beneficial effects of the utility model are as follows: when the utility model is in use, air can enter the inner cavity through the air shell, and then supply gas to the burner head through the gas pipe, and then the gas is accelerated when passing through the gas inlet of the burner head, so that low pressure is generated inside the burner head, so that the burner head can suck a small amount of air in the inner cavity into the mixing cavity inside the burner head through the first gas inlet hole and the second gas inlet hole, and then start the ignition electrode to ignite to perform oxygen-poor combustion in the mixing cavity, so that the gas and a small amount of air are mixed to form an oxygen-deficient state, and the burner does not burn completely in the oxygen-deficient state, which can The combustion temperature is lowered and NOx production is reduced. At the same time, the CO produced by incomplete combustion has reducing properties and can reduce the produced NOx into N2. At the same time, the incomplete combustion gas enters the inner cavity through the air outlet, and is mixed and burned with the excess air in the inner cavity, and then is ejected at high speed through the nozzle. The mixed gas can be sent into the furnace for combustion, and CO can be converted into CO2. Therefore, the nozzle only needs a combination of three groups of simple structures to achieve efficient and reliable reduction of NOx and CO produced during burner combustion, thereby improving the combustion efficiency and environmental protection performance of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of the overall structure of the burner of the utility model;

[0013] Figure 2 This is a cross-sectional view of the overall structure of the combustion head of the utility model;

[0014] Figure 3 This is a cross-sectional view of the overall structure of the baffle of the utility model;

[0015] Figure 4The figure is a gas flow diagram inside the burner of the utility model;

[0016] As shown in the figure: air shell 1, gas pipe 2, combustion head 3, burner nozzle 4, nozzle 5, inner cavity 6, air inlet 7, first air inlet hole 8, second air inlet hole 9, air outlet 10, baffle 11, mixing chamber 12, ignition electrode 13, air inlet channel 14, air inlet 15, air orifice plate 16, connecting flange 17, and gas orifice plate 18. DETAILED DESCRIPTION

[0017] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] As attached Figure 1 and 4 As shown, the utility model provides a high-speed low-nitrogen burner, including an air shell 1, a gas pipe 2, a combustion head 3 and a burner nozzle 4. The gas pipe 2 is arranged at the center of the air shell 1, and the air inlet end of the gas pipe 2 extends out of the air shell 1. The external gas pipe network is subsequently connected to the gas pipe 2, so that the gas pipe 2 can be supplied with gas. Subsequently, the gas outlet end of the gas pipe 2 is provided with the combustion head 3, so that the gas can enter the combustion head 3 through the gas pipe 2. A burner nozzle 4 is arranged on the side of the air shell 1 close to the combustion head 3, and a nozzle 5 is provided at the end of the burner nozzle 4 away from the air shell 1. An inner cavity 6 is provided inside the burner nozzle 4, and the combustion head 3 is arranged inside the inner cavity 6.

[0019] As attached Figure 1 and 4 As shown, an air intake passage 14 is subsequently provided at the upper portion of the air shell 1, the air intake passage 14 is connected to the air shell 1, an air inlet 15 is provided at one end of the air intake passage 14 away from the air shell 1, and external air can first enter the air intake passage 14 through the air inlet 15, and then enter the air shell 1 through the air intake passage 14.

[0020] It should be noted that a connecting flange 17 is provided between the air shell 1 and the burner nozzle 4. The air shell 1 is connected to the burner nozzle 4 through the connecting flange 17. Therefore, when there is air inside the air shell 1, the air inside the air shell 1 can enter the inner cavity 6 of the burner nozzle 4 through the connecting flange 17.

[0021] As attached Figure 1 , 2As shown in Figures 3 and 4, an air inlet 7 is provided at one end of the burner head 3 close to the gas pipe 2, and the burner head 3 is connected to the gas pipe 2 through the air inlet 7. The diameter of the air inlet 7 of the burner head 3 is smaller than the diameter of the outlet end of the gas pipe 2, so that a plurality of first air inlet holes 8 and a plurality of second air inlet holes 9 can be provided on the outer surface of the burner head 3, and an air outlet 10 is provided at the other end of the burner head 3, a baffle 11 is provided at the air outlet 10, and a plurality of ventilation holes are provided inside the baffle 11, and a mixing chamber 12 is provided inside the burner head 3, and an ignition electrode 13 is provided inside the mixing chamber 12.

[0022] It should be noted that, by opening a plurality of ventilation holes inside the baffle 11, the gas in the mixing chamber 12 can enter the inner cavity 6 of the burner nozzle 4, which can increase the speed at which the gas in the mixing chamber 12 of the burner head is discharged to the inner cavity 6, thereby avoiding the disturbance of the air flow outside the burner head 3 to affect the air flow discharged from the mixing chamber 12, thereby ensuring the stability of the mixing chamber 12 during combustion.

[0023] Preferably, the shape of the burner head 3 is convex, and the burner head 3 gradually narrows from the air outlet 10 to the air inlet 7. The first air inlet hole 8 is opened at the narrowed part of the outer surface of the burner head 3, and the second air inlet hole 9 is set at the central axis of the outer surface of the burner head 3.

[0024] When the nozzle combustion operation is performed: the gas in the gas pipe 2 can enter the combustion head 3 through the air inlet 7, and the diameter of the air inlet 7 of the combustion head 3 is smaller than the diameter of the outlet end of the gas pipe 2, so that the pressure of the gas when it is ejected can be increased, thereby increasing the flow rate of the gas entering the combustion head 3, so that a low pressure can be formed in the mixing chamber 12 inside the combustion head 3. When the low pressure is formed inside the combustion head 3, a small amount of air inside the air shell 1 can be sucked into the combustion head 3 from the first air inlet hole 8 and the second air inlet hole 9, so that it can be mixed in the mixing chamber 12, so that the gas and a small amount of air are mixed to form an oxygen-deficient state, and the ignition operation is performed by starting the ignition electrode 13, so that oxygen-deficient combustion of the combustion head 3 can be achieved. The burner does not burn completely in the oxygen-deficient state, which can reduce the combustion temperature and reduce NOx production. At the same time, the incomplete The CO produced by combustion has reducing properties and can reduce the produced NOx into N2, so that incomplete combustion products will be produced after the combustion of the combustion head 3, and the incomplete combustion products can subsequently enter the inner cavity 6 of the burner nozzle 4 through the ventilation holes of the baffle 11, so that they can be secondary mixed with excess air in the inner cavity 6, and then ejected at high speed through the nozzle 5, so that the secondary mixed gas is sent to the external furnace for complete combustion, thereby converting the residual CO into CO2, and the CO produced by the previous oxygen-poor combustion or the lack of time for full combustion is converted into CO2, so that the burner can achieve low-nitrogen, low-oxide combustion operation, so the nozzle only needs a combination of three groups of simple structures to achieve efficient and reliable reduction of NOx and CO generated during burner combustion, thereby improving the combustion efficiency and environmental protection performance of the burner.

[0025] Preferably, a gas orifice plate 18 is provided at the inlet end of the gas pipe 2. The gas flow rate can be calculated by measuring the pressure difference on both sides of the gas orifice plate 18. Subsequently, an air orifice plate 16 is provided at the air inlet 15. The air flow rate can be calculated by measuring the pressure difference on both sides of the air orifice plate 16.

[0026] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A high-speed low-nitrogen burner, comprising an air shell (1), a gas pipe (2), a combustion head (3) and a burner nozzle (4), characterized in that: A gas pipe (2) is arranged at the center of the air shell (1); an air inlet end of the gas pipe (2) extends outside the air shell (1); a burner head (3) is arranged at the air outlet end of the gas pipe (2); a burner nozzle (4) is arranged on a side of the air shell (1) close to the burner head (3); a nozzle (5) is provided at an end of the burner nozzle (4) away from the air shell (1); an inner cavity (6) is provided inside the burner nozzle (4); and the burner head (3) is arranged inside the inner cavity (6).

2. A high-speed low-nitrogen burner according to claim 1, characterized in that: An air inlet (7) is provided at one end of the burner head (3) close to the gas pipe (2), and the burner head (3) is connected to the gas pipe (2) via the air inlet (7). The diameter of the air inlet (7) of the burner head (3) is smaller than the diameter of the outlet end of the gas pipe (2). A plurality of first air inlet holes (8) and a plurality of second air inlet holes (9) are provided on the outer surface of the burner head (3). An air outlet (10) is provided at the other end of the burner head (3), and a baffle (11) is provided at the air outlet (10). A plurality of ventilation holes are provided inside the baffle (11).

3. A high-speed low-nitrogen burner according to claim 2, characterized in that: The shape of the burner head (3) is convex, and the burner head (3) gradually narrows from the air outlet (10) to the air inlet (7). The first air inlet hole (8) is provided at the narrowed portion of the outer surface of the burner head (3), and the second air inlet hole (9) is provided at the central axis of the outer surface of the burner head (3).

4. A high-speed low-nitrogen burner according to claim 3, characterized in that: A mixing chamber (12) is provided inside the combustion head (3), and an ignition electrode (13) is arranged inside the mixing chamber (12).

5. A high-speed low-nitrogen burner according to claim 1, characterized in that: An air intake passage (14) is provided at the upper portion of the air shell (1), the air intake passage (14) being in communication with the air shell (1), an air inlet (15) being provided at one end of the air intake passage (14) away from the air shell (1), and an air orifice plate (16) being provided at the air inlet (15).

6. A high-speed low-nitrogen burner according to claim 1, characterized in that: A connecting flange (17) is provided between the air shell (1) and the burner nozzle (4), and the air shell (1) is connected to the burner nozzle (4) via the connecting flange (17).

7. A high-speed low-nitrogen burner according to claim 1, characterized in that: A gas orifice plate (18) is provided at the inlet end of the gas pipe (2).

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