Low-nitrogen combustor
By designing a splitter pipe and a splitter head, the combustion air is divided into multiple stages and coordinated with the nozzles on the gas pipeline, which solves the problem of low-NOx combustion in the roller kiln burner under low-power conditions, and achieves high combustion efficiency and low NOx generation.
Patent Information
- Application Number
- CN202520120137.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-17
AI Technical Summary
The burners in the roller kiln have difficulty achieving low-NOx combustion under low-power conditions, which leads to an increase in nitrogen oxides and poses safety hazards.
By designing a splitter pipe and splitter head, the combustion air is divided into premixed combustion air, first-stage combustion air, second-stage combustion air, and third-stage combustion air. This, combined with the nozzles on the gas pipeline, enables multi-stage premixing and mixing of gas and combustion air, thereby reducing combustion temperature and nitrogen oxide generation.
It improves the mixing efficiency of gas and combustion air, reduces the generation of nitrogen oxides, ensures safety and combustion efficiency, and avoids increased energy consumption.
Smart Images
Figure CN223755355U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to burner technical field, concretely relates to a low nitrogen burner. BACKGROUND
[0002] The roller kiln is the firing equipment of the building ceramic, and the burners are distributed along the length direction of the roller kiln, and are staggered on the up and down and left and right of the roller kiln wall, with the increasing environmental protection standard, the building ceramic product unit energy consumption is lower and lower, the single burner combustion power drops, and the single burner gas volume drops, but if the combustion air volume drops, it is easy to extinguish and bring the safety hidden danger, if the combustion air volume remains unchanged, it is easy to cause the nitrogen oxide to rise, thereby causing the traditional burner to be difficult to achieve the low nitrogen combustion of the small power burner.
[0003] Therefore, the prior art still needs to be improved and developed. CONTENT OF THE UTILITY MODEL
[0004] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a low nitrogen burner, which aims to solve the problem that the burner in the roller kiln is difficult to achieve low nitrogen combustion of the small power burner under small power working conditions.
[0005] The technical scheme adopted by the utility model to solve the technical problems is as follows:
[0006] A low nitrogen burner comprises:
[0007] A fixed shell is provided with a gas inlet on one side and an outlet on the other side;
[0008] A gas pipeline is arranged inside the fixed shell; one end of the gas pipeline is in communication with the gas inlet, and the other end is provided with a plurality of first injection holes and a plurality of second injection holes, and the first injection holes and the second injection holes are perpendicular to the outer surface of the gas pipeline;
[0009] An air inlet is arranged on the side of the fixed shell close to the gas inlet;
[0010] A flow divider is arranged in the fixed shell; the inlet of the flow divider is connected with the air inlet to divide the combustion air into premixed combustion air and third-stage combustion air; the flow divider is sleeved on the gas pipeline;
[0011] A flow divider head is arranged at one end of the flow divider away from the air inlet to divide the premixed combustion air into first-stage combustion air and second-stage combustion air; the first-stage combustion air cooperates with a plurality of the first injection holes, and the second-stage combustion air cooperates with a plurality of the second injection holes.
[0012] Further, an outer surface of the shunt pipe is arranged spaced apart from an inner wall of the fixed shell to enclose a first air slot, an inner wall of the shunt pipe is arranged spaced apart from an outer surface of the gas pipe to enclose a second air slot, a plurality of shunt grooves are radially arranged on the inner wall of the shunt pipe to divide the combustion-supporting air into premixed combustion-supporting air and third-stage combustion-supporting air, the extension direction of the plurality of shunt grooves is at an angle to the outer surface of the shunt pipe, the premixed combustion-supporting air is located in the second air slot, and the third-stage combustion-supporting air is located in the first air slot.
[0013] Further, the gas pipe comprises:
[0014] A conveying straight pipe is arranged inside the fixed shell, one end of the conveying straight pipe is in communication with the gas inlet;
[0015] A connecting head is arranged at one end of the conveying straight pipe away from the gas inlet, one end of the connecting head is provided with an arc-shaped block, a plurality of first injection holes are radially arranged on the outer surface of the connecting head, and a plurality of second injection holes are radially arranged on the arc-shaped block.
[0016] Further, the shunt head comprises:
[0017] A first groove plate, the outer surfaces of the conveying straight pipe and the connecting head are respectively provided with a first support block and a plurality of second support blocks, the first groove plate abuts against the first support block and the plurality of second support blocks, so that the shunt head and the connecting head enclose a first premixing channel;
[0018] A plurality of first groove holes are radially arranged on the outer surface of the first groove plate to communicate the first premixing channel with the second air slot;
[0019] An abutting block is arranged on the outer surface of the first groove plate, the abutting block abuts against the shunt pipe;
[0020] A plurality of second groove holes are radially arranged on the abutting block to communicate the second air slot with the internal cavity of the fixed shell.
[0021] Further, the second groove holes are arranged in a spiral manner, and the arc-shaped block protrudes from the outer surface of the shunt head.
[0022] Further, the plurality of second support blocks are radially arranged, and the second support blocks are arranged in an inclined manner to form an inclined air duct between two adjacent second support blocks.
[0023] Further, the outer surface of the abutting block is radially provided with a plurality of rotational flow grooves, and the rotational flow grooves are opposite in spiral direction to the second groove holes.
[0024] Further, a first thread is arranged on the inner wall of the first slot plate, and a second thread is arranged on the outer surface of the first supporting block, and the first thread cooperates with the second thread.
[0025] Further, a limiting groove is arranged on one side of the shunt pipe, and the abutting block is located in the limiting groove.
[0026] Further, the fixed shell comprises:
[0027] a first connecting shell;
[0028] a second connecting shell arranged on one side of the first connecting shell; the second connecting shell cooperates with the second connecting shell to form an internal passage, and a fixed step is arranged on one side of the second connecting shell;
[0029] a fixed plate sleeved on the second connecting shell; a clamping hole is arranged on the fixed plate, the clamping hole is clamped with the fixed step, and the fixed plate cooperates with the first connecting shell to connect the second connecting shell with the first connecting shell.
[0030] Compared with the prior art, the utility model has the advantages of:
[0031] In the utility model, the combustion-supporting wind entering the fixed shell is divided into premixed combustion-supporting wind and third-stage combustion-supporting wind through the shunt pipe, and the premixed combustion-supporting wind can be divided into first-stage combustion-supporting wind and second-stage combustion-supporting wind through the shunt head, the first-stage combustion-supporting wind cooperates with the first injection hole on the gas pipeline to premix gas, the second-stage combustion-supporting wind cooperates with the second injection hole on the gas pipeline to premix gas again, thereby the premixing efficiency of gas and combustion-supporting wind can be effectively improved, premixing combustion is carried out, and the generation of nitrogen oxides is reduced; meanwhile, the third-stage combustion-supporting wind can reduce the temperature of the combustion chamber of premixing combustion, thereby the rapid type and thermal type nitrogen oxides can be effectively reduced; the third-stage combustion-supporting wind spirally advances along the shunt groove under the action of the shunt groove, the wind resistance is reduced, the heating time of the third-stage combustion-supporting wind is prolonged, the purpose of reducing the temperature of the combustion chamber is achieved, and the temperature is not too low to cause the increase of energy consumption, the third-stage combustion-supporting wind can also make the incomplete combustion flue gas oxidize and burn again, and the effect of full combustion is achieved; the application can effectively distribute the combustion-supporting wind, thereby the mixing efficiency of gas and combustion-supporting wind can be improved, the input amount of combustion-supporting wind can be effectively reduced, the premixing of gas and combustion-supporting wind can improve the combustion efficiency, the temperature of premixing flame combustion is reduced through the third-stage combustion-supporting wind, and the purpose of reducing the content of rapid type and thermal type nitrogen oxides is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 It is a whole structure schematic view of the utility model.
[0033] Figure 2The utility model discloses fixed casing sectional structure schematic diagram.
[0034] Figure 3 For Figure 2 The utility model discloses fixed casing sectional structure schematic diagram.
[0035] Figure 4 For Figure 2 The utility model discloses fixed casing sectional structure schematic diagram.
[0036] Figure 5 The utility model discloses fixed casing sectional structure schematic diagram.
[0037] Figure 6 The utility model discloses fixed casing sectional structure schematic diagram.
[0038] The utility model discloses fixed casing sectional structure schematic diagram. Specific implementation
[0039] In order to make the purpose, technical scheme and effect of the utility model more clear and definite, the following will be further detailed with reference to the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.
[0040] In the description of the utility model, it should be understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.
[0041] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0042] In view of the deficiencies of the prior art, the embodiment provides a low-nitrogen burner, which can be specifically referred to as follows:
[0043] As shown in the accompanying Figure 1 and the accompanying Figure 2 A low-nitrogen burner includes a fixed shell 1, a gas pipeline 2, an air inlet 13, a shunt pipe 3 and a shunt head 4;The fixed shell 1 is provided with a gas inlet 11 on one side, and an outlet 12 on the other side, the fixed shell 1 is arranged through the wall of the roller kiln, the gas inlet 11 is located outside the roller kiln, the outlet 12 is located inside the roller kiln, and the gas inlet 11 is connected with the external equipment;The fixed shell 1 is provided with a gas pipeline 2 in the inside, one end of the gas pipeline 2 is communicated with the gas inlet 11, and the external gas input device inputs into the gas pipeline 2 through the gas inlet 11, the other end of the gas pipeline 2 is provided with a plurality of first injection holes 21 and a plurality of second injection holes 22, which can achieve the dispersion of gas, the first injection hole 21 and the second injection hole 22 are perpendicular to the outer surface of the gas pipeline 2;The fixed shell 1 is further provided with an air inlet 13 on the side close to the gas inlet 11, the air inlet 13 is located outside the roller kiln, the fixed shell 1 is provided with a shunt pipe 3 in the inside, the inlet of the shunt pipe 3 is connected with the air inlet 13, the shunt pipe 3 is used for dividing the entering combustion-supporting air into premixed combustion-supporting air and third-stage combustion-supporting air, the premixed combustion-supporting air is mixed with the gas, the third-stage combustion-supporting air is located on the inner wall side of the fixed shell 1, which is used for combustion-supporting and cooling the premixed combustion chamber, the shunt pipe 3 is sleeved on the gas pipeline 2 to facilitate cooperation with the gas pipeline 2;The end of the shunt pipe 3 away from the air inlet 13 is provided with a shunt head 4, the shunt head 4 can divide the premixed combustion-supporting air into first-stage combustion-supporting air and second-stage combustion-supporting air, the first-stage combustion-supporting air cooperates with the plurality of first injection holes 21, and the second-stage combustion-supporting air cooperates with the plurality of second injection holes 22, so that the mixing efficiency of the gas and the combustion-supporting air can be effectively improved, and the combustion efficiency is improved.
[0044] Specifically, the combustion-supporting air and the gas are filled into the shunt pipe 3 and the gas pipeline 2, and the combustion-supporting air is divided into premixed combustion-supporting air and third-stage combustion-supporting air under the action of the shunt pipe 3. The premixed combustion-supporting air is used for mixing with the gas to improve the combustion efficiency. One end of the gas pipeline 2 is provided with an igniter, and the gas can be ignited and continuously combusted through the igniter. The third-stage combustion-supporting air is wrapped around the shunt pipe 3 in a spiral manner under the action of the shunt groove 31, and is spirally advanced to the premixed combustion combustion chamber to be cooled, so as to avoid increasing the generation rate of nitrogen oxides due to the excessively high combustion temperature, and to prolong the heating time of the third-stage combustion-supporting air, so as not to cause the flame temperature to be too low to cause the energy consumption to increase. The application can effectively distribute the combustion-supporting air, thereby improving the mixing efficiency of the gas and the combustion-supporting air, effectively reducing the input amount of the combustion-supporting air, improving the combustion efficiency through premixing of the gas and the combustion-supporting air, and reducing the concentration of rapid and thermal nitrogen oxides by reducing the combustion temperature through the third-stage combustion-supporting air.
[0045] In the embodiment, as shown in the accompanying drawings, Figure 2 The outer surface of the shunt pipe 3 is arranged in a spaced manner with the inner wall of the fixed shell 1 to enclose the first air groove 5 to facilitate the flow of the combustion-supporting air. The inner wall of the shunt pipe 3 is arranged in a spaced manner with the outer surface of the gas pipeline 2 to enclose the second air groove 6 to facilitate the flow of the combustion-supporting air. A plurality of shunt grooves 31 are radially arranged on the inner wall of the shunt pipe 3. The extension direction of the plurality of shunt grooves 31 is at a certain angle with the outer surface of the shunt pipe 3, so as to divide the combustion-supporting air entering the shunt pipe 3 into premixed combustion-supporting air and third-stage combustion-supporting air. The premixed combustion-supporting air is located in the second air groove 6 and is used for mixing with the gas. The third-stage combustion-supporting air is located in the first air groove 5 and is used for cooling the premixed combustion combustion chamber and re-combustion.
[0046] The plurality of shunt grooves 31 are at a certain angle with the outer surface of the shunt pipe 3, which not only can shunt the combustion-supporting air entering the inside of the fixed shell 1, but also can make the shunted third-stage combustion-supporting air spirally advance along the outer surface of the shunt pipe 3. The third-stage combustion-supporting air spirally advances along the surface of the shunt pipe 3 under the action of the shunt groove 31, which not only can reduce the wind resistance, but also can prolong the heating time of the third-stage combustion-supporting air. The purpose is to reduce the combustion temperature, but not too low. If the temperature of the third-stage combustion-supporting air is too low, the energy consumption will increase.
[0047] In the embodiment, as shown in the accompanying drawings, Figure 3 and the accompanying drawings, Figure 6As shown, the gas pipeline 2 includes a straight delivery pipe 23 and a connector 24. The straight delivery pipe 23 is located inside the fixed housing 1. One end of the straight delivery pipe 23 is connected to the gas inlet 11, and the other end is provided with the connector 24. An arc-shaped block 25 is provided at the end of the connector 24 away from the straight delivery pipe 23 to block the straight delivery pipe 23 and the connector 24. Multiple first nozzles 21 are radially arranged on the outer surface of the connector 24. The first nozzles 21 are mixed with the premixed combustion air. Multiple second nozzles 22 are radially arranged on the arc-shaped block 25. The first nozzles 21 and the second nozzles 22 are arranged radially along the straight delivery pipe 23, so that the gas ejected from the first nozzles 21 and the second nozzles 22 is perpendicular to the flow direction of the combustion air, so as to facilitate the mixing of gas and combustion air.
[0048] Further details are attached. Figure 3 As shown, the first slot 42 is located at the end of the connector 24 near the straight conveying pipe 23, and the second slot 44 is located at the end of the connector 24 away from the straight conveying pipe 23. The second slot 44 protrudes from the side of the diverter head 4 to facilitate mixing with the combustion air inside the diverter head 4.
[0049] In this embodiment, as shown in the appendix Figure 3 and attached Figure 5 As shown, the diverter head 4 includes a first groove plate 41, multiple first slots 42, an abutment block 43, and multiple second slots 44. The first groove plate 41 is cylindrical with a through hole in the middle for easy mounting on the straight conveying pipe 23. A first support block 231 and multiple second support blocks 241 are respectively provided on the outer surfaces of the straight conveying pipe 23 and the connector 24. The first support block 231 is located on the side of the straight conveying pipe 23 closer to the connector 24 and is arranged in a ring. The multiple second support blocks 241 are located on the side of the connector 24 away from the straight conveying pipe 23 and are arranged radially. The first support blocks 231 and second support blocks 241 facilitate support of the first groove plate 41 and form a first pre-formation between the first groove plate 41 and the combustion pipe. The first premixing channel facilitates the entry of combustion air and its mixing with the gas. Multiple first slots 42 are radially arranged on the outer surface of the first slot plate 41, allowing the second air duct 6 to connect with the first premixing channel, thus facilitating the mixing of premixed combustion air and gas. An abutment block 43 is provided on the outer surface of the first slot plate 41, surrounding the outer surface of the first slot plate 41. The outer surface of the abutment block 43 abuts against the inner wall of the diversion pipe 3, supporting and fixing the diversion pipe 3. Multiple second slots 44 are radially arranged on the abutment block 43, connecting the second layer to the internal cavity of the fixed housing 1, facilitating the entry of combustion air into the fixed housing 1 and its mixing with the gas ejected from the second nozzle 22.
[0050] By setting the first slot 42 and the second slot 44, the first-stage combustion air can be mixed with the gas ejected from the first nozzle 21, and the second-stage combustion air can be mixed with the gas ejected from the second nozzle 22, so as to maximize the mixing efficiency and improve the combustion efficiency. Specifically, the flow direction of the first-stage combustion air is perpendicular to the first nozzle 21, and the flow direction of the second-stage combustion air is perpendicular to the second nozzle 22, further improving the mixing efficiency.
[0051] In this embodiment, the second slot 44 is arranged in a spiral shape, so that the second-stage combustion air flows in a spiral shape, and the arc block 25 protrudes from the outer surface of the diverter head 4, and the second slot 44 is located on the arc block 25; when the second slot 44 sprays gas perpendicular to the second-stage combustion air, it can accelerate the mixing of combustion air and gas under the spiral flow of the second-stage combustion air.
[0052] In this embodiment, as shown in the appendix Figure 6 As shown, multiple second support blocks 241 are arranged radially and inclined to form an inclined air duct between two adjacent second support blocks 241. The first nozzle 21 is located between two adjacent second support blocks 241 to facilitate correspondence with the first-stage combustion air. At the same time, after the first-stage combustion air and the gas ejected from the first nozzle 21 are mixed, they will move in a spiral shape toward the outlet 12 of the fixed housing 1. The spiral-shaped mixed gas can also be easily mixed again with the second-stage combustion air and the gas ejected from the second nozzle 22, further improving the premixing efficiency.
[0053] Furthermore, the outer surface of the contact block 43 is radially provided with multiple swirling grooves 45, the spiral directions of which are opposite to those of the second slot 44. The second-stage combustion air flows through the second slot 44 and the swirling grooves 45 toward the outlet 12 of the fixed housing 1. By setting the spiral directions of the swirling grooves 45 and the second slot 44 opposite, the combustion air flowing through the second slot 44 and the swirling grooves 45 can flow in opposite spiral directions. During the flow, the two combustion air streams will also mix to improve the mixing efficiency of the gas and the combustion air.
[0054] In this embodiment, a first thread is provided on the inner wall of the first groove plate 41, and a second thread is provided on the outer surface of the first support block 231. The first thread and the second thread cooperate with each other. By the threaded cooperation of the first thread and the second thread, the diverter head 4 can be connected to the gas pipeline 2, and the diverter head 4 abuts against the diverter pipe 3 to fix the diverter pipe 3.
[0055] In this embodiment, a limiting groove 32 is provided on one side of the diversion pipe 3, and the abutment block 43 is located in the limiting groove 32 to facilitate the restriction of the abutment block 43, while also enhancing the support and connection of the diversion pipe 3.
[0056] In the present embodiment, as shown in the accompanying drawings Figure 2 and the accompanying drawings Figure 4 As shown in the accompanying drawings, the fixed housing 1 comprises a first connecting housing 14, a second connecting housing 15 and a fixed plate 16, the first connecting housing 14 and the second connecting housing 15 are both cylindrical, the first connecting housing 14 and the second connecting housing 15 are coaxially arranged, and the interiors of the first connecting housing 14 and the second connecting housing 15 are both provided with cavities, the second connecting housing 15 cooperates with the first connecting housing 14 to form an internal passage; one side of the second connecting housing 15 is provided with a fixed step, the middle of the fixed plate 16 is provided with a clamping hole, the clamping hole is sleeved on the second connecting housing 15, and the fixed plate 16 abuts against the fixed step, by fixing the fixed plate 16 and the first connecting housing 14, the first connecting housing 14 and the second connecting housing 15 can be fixed.
[0057] Further, the diameter of the internal cavity of the first connecting housing 14 is smaller than the diameter of the internal cavity of the second connecting housing 15, the shunt pipe 3 communicates with the internal cavity of the first connecting housing 14, and the shunt pipe 3 is gap-fitted with the second connecting housing 15.
[0058] In the present embodiment, a igniter is arranged on the side of the shunt head 4 away from the gas inlet 11, and the igniter is used to ignite the gas.
[0059] The utility model provides a low nitrogen combustor, including fixed casing 1, gas pipeline 2, shunt pipe 3 and shunt head 4, fixed casing 1 is cylindrical, and gas pipeline 2 is coaxially arranged in the inside of fixed casing 1, and the outside of gas pipeline 2 is equipped with shunt pipe 3, and shunt pipe 3 is located in fixed casing 1, and is connected with the air inlet 13 of fixed casing 1, and shunt pipe 3 is provided with shunt head 4 with the same end of gas pipeline 2 away from gas import 11, one end of gas pipeline 2 is provided with first injection hole 21 and second injection hole 22, by the effect of shunt pipe 3, can divide into premix combustion air and tertiary combustion air for the combustion air that enters fixed casing 1, premix combustion air is used for mixing with the gas that sprays in gas pipeline 2, and tertiary combustion air is used for wrapping premix flame to provide the effect of cooling and combustion support, and premix combustion air will also divide into first stage combustion air and second stage combustion air under the effect of shunt head 4, and first stage combustion air and second stage combustion air mix with the gas that sprays from first injection hole 21 and second injection hole 22 respectively, can effectively improve the mixing effect of gas, wherein, the connecting head 24 of gas pipeline 2 is provided with multiple second support blocks 241 in the form of inclination, and the adjacent two second support blocks 241 are arranged at intervals, are used to form air duct and make mixed gas spiral advance, shunt head 4 is provided with second slot hole 44 and rotational flow groove 45 in the opposite spiral direction, further improves the mixing efficiency of second stage combustion air and gas, through the above-mentioned device, can effectively distribute combustion air, and then improve the mixing efficiency of gas and combustion air, can effectively reduce the input of combustion air, and through the premix of gas and combustion air, can improve the combustion efficiency, and at the same time, through tertiary combustion air, the temperature of premix flame is reduced, realizes the purpose of reducing fast type and thermal type nitrogen oxide content.
[0060] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.
Claims
1. A low-nitrogen burner, characterized by, The utility model provides a kind of gas burner, including: Fixed housing, one side is provided with gas inlet, the other side is provided with outlet; Gas pipeline is arranged in the inside of the fixed housing;One end of the gas pipeline is communicated with the gas inlet, the other end is provided with a plurality of first injection hole and a plurality of second injection hole, the first injection hole and the second injection hole are perpendicular to the outer surface of the gas pipeline; Air inlet is arranged in the side of the fixed housing close to the gas inlet; Shunt pipe is arranged in the fixed housing;The inlet of the shunt pipe is connected with the air inlet to divide combustion-supporting air into premixed combustion-supporting air and third-stage combustion-supporting air;The shunt pipe is sleeved on the gas pipeline; Shunt head is arranged in the end of the shunt pipe away from the air inlet to divide the premixed combustion-supporting air into first-stage combustion-supporting air and second-stage combustion-supporting air;The first-stage combustion-supporting air cooperates with a plurality of the first injection hole, and the second-stage combustion-supporting air cooperates with a plurality of the second injection hole.
2. A low NOx burner according to claim 1, wherein The outer surface of the shunt pipe is arranged with interval between the inner wall of the fixed housing to enclose first air groove, the inner wall of the shunt pipe is arranged with interval between the outer surface of the gas pipeline to enclose second air groove, a plurality of shunt grooves are radially arranged on the inner wall of the shunt pipe to divide combustion-supporting air into premixed combustion-supporting air and third-stage combustion-supporting air, the extension direction of a plurality of the shunt grooves is at a certain angle with the outer surface of the shunt pipe, the premixed combustion-supporting air is located in the second air groove, and the third-stage combustion-supporting air is located in the first air groove.
3. A low NOx burner according to claim 2, wherein The gas pipeline includes: Conveying straight pipe is arranged in the inside of the fixed housing;One end of the conveying straight pipe is communicated with the gas inlet; Connector is arranged in the end of the conveying straight pipe away from the gas inlet;One end of the connector is provided with arc block, a plurality of the first injection hole is radially arranged on the outer surface of the connector, and a plurality of the second injection hole is radially arranged on the arc block.
4. A low NOx burner according to claim 3, wherein The shunt head includes: First groove plate;The outer surface of the conveying straight pipe and the connector is respectively provided with first support block and a plurality of second support blocks, the first groove plate abuts against the first support block and a plurality of the second support blocks to make the shunt head and the connector enclose first premixing channel; A plurality of first groove holes are radially arranged on the outer surface of the first groove plate to communicate the first premixing channel with the second air groove; Abutting block is arranged on the outer surface of the first groove plate;The abutting block abuts against the shunt pipe; A plurality of second groove holes are radially arranged on the abutting block to communicate the second air groove with the internal cavity of the fixed housing.
5. A low NOx burner according to claim 4, wherein The second groove hole is arranged in spiral shape, and the arc block protrudes from the outer surface of the shunt head.
6. A low NOx burner as set forth in claim 4, characterized in that A plurality of the second support blocks are radially arranged, and the second support blocks are arranged in inclined shape to form inclined air duct between adjacent two second support blocks.
7. A low NOx burner as set forth in claim 4, characterized in that The outer surface of the abutting block is radially provided with a plurality of rotational flow grooves, and the rotational flow grooves are opposite to the spiral direction of the second groove hole.
8. A low NOx burner as set forth in claim 4, characterized in that The inner wall of the first slot plate is provided with a first thread, and the outer surface of the first supporting block is provided with a second thread, which cooperates with the first thread.
9. A low NOx burner as set forth in claim 4, characterized in that One side of the shunt pipe is provided with a limiting groove, and the abutting block is located in the limiting groove.
10. A low NOx burner as set forth in claim 1, characterized in that The fixed shell comprises: a first connecting shell; a second connecting shell arranged on one side of the first connecting shell; the second connecting shell cooperates with the second connecting shell to form an internal passage, and one side of the second connecting shell is provided with a fixed step; a fixed plate sleeved on the second connecting shell; a clamping hole is formed in the fixed plate, the clamping hole is clamped with the fixed step, and the fixed plate cooperates with the first connecting shell to connect the second connecting shell with the first connecting shell.