Low-nitrogen burner with anti-backfire structure

Abstract

The utility model discloses a low-nitrogen burner with an anti-backfire structure, and particularly relates to the field of burners, which comprises a gas pipe, a mixed gas cylinder is mounted in the gas pipe, a plurality of gas inlets are arranged on the surface of the mixed gas cylinder, a support rod is mounted in the mixed gas cylinder, and a plurality of swirl plates are fixed on the surface of the support rod. One end of the mixed gas cylinder communicates with a gas injection pipe; one end of the gas pipe communicates with a communicating pipe, and a fire outlet head is detachably installed at one end of the mixed gas cylinder. Fuel gas and air are mixed at the position of the spinning disk, the mixing effect is improved, the situation of tempering caused by too high local fuel concentration due to uneven mixing is avoided, the fire outlet head and the communicating pipe are fixed through the fastening bolt, the fire outlet head and the limiting block are connected in a clamped mode, the fire outlet head can be conveniently taken down to be cleaned in the later period, and the fire outlet head is convenient to clean. And the section of the gas outlet is trapezoidal, so that the effects of extending the path and reducing the temperature can be achieved when the gas flows back, and the tempering condition is effectively inhibited.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically a low-NOx burner with a backfire prevention structure. Background Technology

[0002] Low-NOx burners are combustion devices that reduce nitrogen oxide (NOx) emissions through optimized combustion technology. Their core principles include staged combustion, flue gas recirculation (FGR), and premixed combustion, which can reduce NOx emissions from traditional burners from 120-150 mg / m³. 3 Reduced to 30 mg / m 3 the following.

[0003] Backfire in low-NOx burners refers to the phenomenon of flame propagating backwards into the burner. When the gas and air are not mixed evenly, the fuel concentration in some areas is too high, exceeding the combustion limit. This can easily cause the flame to propagate backwards and form backfire. Backfire in low-NOx burners can directly burn metal parts at high temperatures, causing them to deform or melt. It can also lead to carbon black deposits that clog nozzles or contaminate heat exchange surfaces, reducing thermal efficiency and shortening equipment life. To prevent backfire, the length of the flame outlet on the burner head is usually extended. However, since the flame outlet is fixed to the burner, this also makes it difficult to clean the carbon deposits inside the flame outlet.

[0004] Therefore, we have made improvements to this by proposing a low-NOx burner with a backfire prevention structure. Utility Model Content

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

[0006] This utility model discloses a low-NOx burner with a backfire prevention structure, comprising a gas pipe, a mixing cylinder installed inside the gas pipe, multiple air inlets evenly distributed circumferentially on the surface of the mixing cylinder, a support rod installed inside the mixing cylinder, multiple swirl vanes evenly fixed circumferentially on the surface of the support rod, and an injection pipe connected to one end of the mixing cylinder; a connecting pipe connected to one end of the gas pipe, a limit block installed on the inner wall of the connecting pipe, one end of the mixing cylinder extending into the connecting pipe, and a detachable burner head detachably installed at one end of the mixing cylinder, with multiple air outlets provided on the burner head.

[0007] As a preferred embodiment of this utility model, the support rod is rotatably disposed at one end of the mixing cylinder, and the air inlet is located on one side of the swirl vane.

[0008] As a preferred embodiment of this utility model, one end of the gas injection pipe extends to the outside of the gas pipe, and the gas pipe is provided with a gas injection port.

[0009] As a preferred technical solution of this utility model, the limiting block is provided with a slot, and one end of the flame head is fixedly provided with a locking block, which is engaged in the slot.

[0010] As a preferred technical solution of this utility model, the side of the flame head is evenly provided with multiple slots II, the surface of the flame head and the connecting pipe is fitted with fasteners, and one end of the fastener is fixedly provided with a locking block II, and the locking block II is engaged with the slot II, and the flame head and the fastener, and the fastener and the connecting pipe are respectively fixed by fastening bolts.

[0011] As a preferred embodiment of this utility model, the cross-section of the air outlet is trapezoidal, and the number and diameter of the air outlets gradually decrease and become smaller from the center to the outside.

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

[0013] In this invention, the gas and air are mixed at the swirl vane to improve the mixing effect and avoid uneven mixing that could lead to excessively high local fuel concentration and backfire. The burner head is fixed to the connecting pipe with fastening bolts, and the burner head is engaged with the limiting block, making it easy to remove the burner head for cleaning later. The cross-section of the gas outlet is trapezoidal, which can extend the gas path and reduce the temperature during gas backflow, effectively suppressing backfire. 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 structure of a low-NOx burner with a backfire prevention structure according to this utility model. Figure 1 ;

[0016] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a schematic diagram of the structure of a low-NOx burner with a backfire prevention structure according to this utility model. Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the structure of a low-NOx burner with a backfire prevention structure according to this utility model. Figure 3 .

[0019] In the diagram: 1. Gas pipe; 2. Mixing cylinder; 3. Support rod; 4. Swirl vane; 5. Air inlet; 6. Flame head; 7. Air outlet; 8. Connecting pipe; 9. Limiting block; 10. Locking block one; 11. Locking block two; 12. Fastening bolt; 13. Gas injection pipe. 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, this utility model discloses a low-NOx burner with a backfire prevention structure, including a gas pipe 1. A mixing cylinder 2 is installed inside the gas pipe 1, where gas and air are mixed. Multiple air inlets 5 are evenly distributed circumferentially on the surface of the mixing cylinder 2, and a support rod 3 is installed inside the mixing cylinder 2. Multiple swirl vanes 4 are evenly fixed circumferentially on the surface of the support rod 3, and one end of the mixing cylinder 2 is connected to an injection pipe 13. Gas can be injected into the mixing cylinder 2 through the injection pipe 13, and gas in the gas pipe 1 also enters the mixing cylinder 2 through the air inlets 5. Both gases are blown towards the swirl vanes 4, causing the swirl vanes 4 to rotate, thereby driving the two gas components to produce radial stratification, promoting mass exchange. The shear effect generated by the rotating flow will intensify the turbulence intensity inside the fluid, forming local vortices, increasing the residence time of the gas in the mixing area, and avoiding backfire caused by uneven mixing and excessively high local fuel concentration.

[0022] One end of the gas pipe 1 is connected to a connecting pipe 8, and a limiting block 9 is installed on the inner wall of the connecting pipe 8. One end of the mixing cylinder 2 extends into the connecting pipe 8, and a detachable burner head 6 is installed on one end of the mixing cylinder 2. The burner head 6 has multiple gas outlets 7. The mixed gas is finally discharged from the gas outlets 7 on the burner head 6. The contact end between the burner head 6 and the connecting pipe 8 has a high-temperature resistant sealing strip. The sealing strip is made of silicone and has good flame-retardant and high-temperature resistant properties. The detachable burner head 6 is designed to facilitate the cleaning of the gas outlets 7 after disassembly, preventing backfire caused by incomplete cleaning.

[0023] The support rod 3 is rotatably mounted at one end of the mixing cylinder 2, and the air inlet 5 is opened on one side of the swirl vane 4. The support rod 3 serves to install the swirl vane 4. The swirl vane 4 is installed at one end of the support rod 3, and the air inlet 5 is opened near the other end to facilitate better mixing of the gas.

[0024] One end of the gas injection pipe 13 extends to the outside of the gas pipe 1, and the gas pipe 1 is provided with a gas injection port. Different gases can enter the mixing cylinder 2 and the gas pipe 1 through the gas injection pipe 13 and the gas injection port respectively. The gas in the gas pipe 1 then enters the mixing cylinder 2 for mixing.

[0025] The limiting block 9 has a slot 1, and one end of the flame head 6 is fixedly provided with a locking block 10, which is engaged in the slot 1. The locking block 10 and the slot 1 are engaged, which can support and limit one end of the flame head 6.

[0026] Multiple slots are evenly distributed on the side of the burner head 6. Fasteners are attached to the surfaces of the burner head 6 and the connecting pipe 8, and a locking block 11 is fixed to one end of the fastener. The locking block 11 engages with the slots. The burner head 6 is fixed to the fasteners, and the fasteners are fixed to the connecting pipe 8 by fastening bolts 12. With the cooperation of the fastening bolts 12 and the fasteners, the burner head 6 is installed on the connecting pipe 8, which facilitates the subsequent removal of the burner head 6 for cleaning of the gas outlet 7, preventing carbon buildup from clogging the gas outlet 7 and affecting the combustion effect or causing backfire.

[0027] The cross-section of the outlet 7 is trapezoidal, and the number and diameter of the outlets 7 gradually decrease from the center to the outside, which can reduce the temperature of the return gas and prevent backfire.

[0028] During operation, the gas and air are mixed at the swirl vane 4 to improve the mixing effect and avoid uneven mixing that could lead to excessively high local fuel concentration and backfire. The burner head 6 is fixed to the connecting pipe 8 by fastening bolts 12, and the burner head 6 is engaged with the limiting block 9, making it easy to remove the burner head 6 for cleaning later. The cross-section of the gas outlet 7 is trapezoidal, which can extend the path and reduce the temperature when the gas flows back, effectively suppressing backfire.

[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. A low-NOx burner with a backfire prevention structure, comprising a gas pipe (1), characterized in that, The gas pipe (1) is equipped with a mixing cylinder (2). The surface of the mixing cylinder (2) is evenly provided with multiple air inlets (5) along the circumference. A support rod (3) is installed inside the mixing cylinder (2). Multiple swirl vanes (4) are evenly fixed on the surface of the support rod (3) along the circumference. One end of the mixing cylinder (2) is connected to an injection pipe (13). One end of the gas pipe (1) is connected to a connecting pipe (8). A limit block (9) is installed on the inner wall of the connecting pipe (8). One end of the mixing cylinder (2) extends into the connecting pipe (8). A burner head (6) is detachably installed on one end of the mixing cylinder (2). Multiple air outlets (7) are provided on the burner head (6).

2. A low-NOx burner with a backfire prevention structure according to claim 1, characterized in that, The support rod (3) is rotatably mounted at one end of the mixing cylinder (2), and the air inlet (5) is located on one side of the swirl vane (4).

3. A low-NOx burner with a backfire prevention structure according to claim 1, characterized in that, One end of the gas injection pipe (13) extends to the outside of the gas pipe (1), and a gas injection port is provided on the gas pipe (1).

4. A low-NOx burner with a backfire prevention structure according to claim 1, characterized in that, The limiting block (9) has a slot, and one end of the flame head (6) is fixedly provided with a locking block (10), which is engaged in the slot.

5. A low-NOx burner with a backfire prevention structure according to claim 1, characterized in that, The side of the flame head (6) is evenly provided with multiple slots. The flame head (6) and the surface of the connecting pipe (8) are fitted with fasteners, and one end of the fastener is fixedly provided with a locking block (11). The locking block (11) is engaged with the slots. The flame head (6) and the fasteners, and the fasteners and the connecting pipe (8) are respectively fixed by fastening bolts (12).

6. A low-NOx burner with a backfire prevention structure according to claim 1, characterized in that, The cross-section of the air outlet (7) is trapezoidal, and the number and diameter of the air outlets (7) gradually decrease and become smaller from the center to the outside.

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