Burner

Abstract

The invention discloses a burner, and belongs to the technical field of rotary hearth furnaces. The burner is provided with an air inlet, a plurality of air nozzles communicated with the air inlet, a coal gas inlet and a plurality of coal gas nozzles communicated with the coal gas inlet; the multiple air nozzles and the multiple gas inlets are arranged at intervals in the X direction, and the air nozzles and the gas inlets are arranged at intervals in the Z direction; the air inlet is communicated with air, and the coal gas inlet is communicated with coal gas. After the burner is installed on the rotary hearth furnace, the gas nozzles are located below the air nozzles, the materials are located below the gas nozzles, and the gas nozzles are arranged at intervals in the X direction, so that the gas nozzles spray out flat gas, the flat gas becomes an air curtain for isolating the materials from air sprayed out of the air nozzles, the air and the materials are separated in the combustion process, and the combustion efficiency of the rotary hearth furnace is improved. And the materials can be heated and can also be in an oxygen-free environment, a good non-oxidation atmosphere is provided for the materials, the heating and reduction requirements of the materials are met, and the reduction efficiency of the materials is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of rotary hearth furnaces, and in particular, relates to a burner. Background Art

[0002] The rotary hearth furnace is a special heating furnace for processing zinc-containing solid waste in steel mills.

[0003] The rotary hearth furnace passes gas and air into the furnace through burners to provide heat for combustion, so as to heat and reduce the materials. During the reduction process, the reduced metallic zinc overflows into the furnace gas.

[0004] If a conventional flame burner is used to heat the material, although the flame burner can provide sufficient heat, the material reduction efficiency is poor. Summary of the invention

[0005] The present application aims to at least to some extent solve the technical problem of poor material reduction efficiency when using a traditional burner to heat the material. To this end, the present application provides a burner.

[0006] An embodiment of the present application provides a burner, comprising an air inlet and a plurality of air nozzles connected to the air inlet, and also comprising a gas inlet and a plurality of gas nozzles connected to the gas inlet; the plurality of air nozzles and the plurality of gas inlets are arranged at intervals along the X direction, and the air nozzles and the gas inlets are arranged at intervals along the Z direction; the air inlet is used to communicate with air, and the gas inlet is used to communicate with gas.

[0007] In some embodiments, the axis of the air nozzle is arranged along the Y direction.

[0008] In some embodiments, the axis of the gas nozzle is 0-3° with the Y direction.

[0009] In some embodiments, along the Z direction, the plurality of air nozzles and the plurality of gas nozzles are arranged in one-to-one correspondence.

[0010] In some embodiments, the burner comprises:

[0011] An air guide assembly, comprising the air inlet and the air nozzle, and used for connecting with an air duct for transmitting air;

[0012] A gas guide assembly, comprising the gas inlet and the gas nozzle, and used for connecting with a gas pipeline for transmitting the gas;

[0013] A connecting piece is connected to the air guide component and the gas guide component.

[0014] In some embodiments, the air guide assembly includes an air guide member and a plurality of air nozzles mounted on the air guide member, the air guide member is used to be connected to the air duct, the air guide member has the air inlet, the air nozzle has the air nozzle, and the air inlet and the air nozzle are connected via air channels opened on the air guide member and the air nozzles.

[0015] In some embodiments, the air guide member includes a first air guide section, a second air guide section and a third air guide section which are connected in sequence; the air nozzle is installed on the third air guide section, the first air guide section has the air inlet and is used to connect with the air duct; the air channel includes a first air channel, a second air channel, a third air channel and a fourth air channel which are respectively opened on the first air guide section, the second air guide section, the third air guide section and the air nozzle and are connected in sequence; the cross-section of the first air channel is circular, the cross-section of the third air channel is rectangular, and the cross-sectional area of ​​the second air channel gradually increases along the air flow direction.

[0016] In some embodiments, the gas guide assembly includes a gas guide member and a plurality of gas nozzles installed on the gas guide member, the gas guide member is used to be connected to the gas pipeline, the gas guide member has the gas inlet, the gas nozzle has the gas nozzle, and the gas inlet and the gas nozzle are connected through a gas channel opened on the gas guide member and the gas nozzle.

[0017] In some embodiments, the gas guide member includes a first gas guide section, a second gas guide section and a third gas guide section which are connected in sequence; the gas nozzle is installed on the third gas guide section, the first gas guide section has the gas inlet and is used to be connected to the gas pipeline; the gas channel includes a first gas channel, a second gas channel, a third gas channel and a fourth gas channel which are respectively opened on the first gas guide section, the second gas guide section, the third gas guide section and the gas nozzle and are connected in sequence; the cross-section of the first gas channel is circular, the cross-section of the third gas channel is rectangular, and the cross-sectional area of ​​the second gas channel gradually increases along the gas flow direction.

[0018] In some embodiments, the burner further includes a mounting member, which is mounted on at least one of the air guide assembly, the gas guide assembly and the connecting member, and the mounting member is used to be connected to the furnace body.

[0019] The present invention has at least the following beneficial effects:

[0020] A plurality of air nozzles are arranged in a row in the X direction, and a plurality of gas nozzles are arranged in a row in the X direction. The two rows are arranged at intervals in the Z direction. After the burner is installed on the rotary hearth furnace, the gas nozzle is located below the air nozzle, and the material is located below the gas nozzle. The plurality of gas nozzles are arranged at intervals in the X direction, so that the plurality of gas nozzles spray flat gas. The flat gas will become an air curtain that isolates the material from the air sprayed from the air nozzle, and isolates the air and the material during the combustion process, so that the material can be heated and in an oxygen-free environment, providing a good non-oxidizing atmosphere for the material, meeting the heating and reduction requirements of the material, and improving the reduction efficiency of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a burner in one or more embodiments of the present application is shown.

[0023] Figure 2 A front view of a burner in one or more embodiments of the present application is shown.

[0024] Figure 3 A top view of a burner in one or more embodiments of the present application is shown.

[0025] Reference numerals: 100, burner; 100a, air inlet; 100b, air nozzle; 100c, gas inlet; 100d, gas nozzle; 100e, air channel; 100e1, first air channel; 100e2, second air channel; 100e3, third air channel; 100e4, fourth air channel; 100f, gas channel; 100f1, first gas channel; 100f2, second gas channel; 100f3, third gas channel; 100e4, fourth air channel; 100f, gas channel; 100f1, first gas channel; 100f2, second gas channel; 100f3, third gas channel; 100e 0f4, fourth gas channel; 110, air guide assembly; 111, air guide member; 1111, first air guide section; 1112, second air guide section; 1113, third air guide section; 112, air nozzle; 120, gas guide assembly; 121, gas guide member; 1211, first gas guide section; 1212, second gas guide section; 1213, third gas guide section; 122, gas nozzle; 130, connector; 140, mounting member. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The applicant of the present application found that: if a conventional flame burner is used to heat the material, although sufficient heat can be provided, the air sprayed into the burner will come into contact with the material and cannot provide a good non-oxidizing atmosphere for the material, so the reduction efficiency of the material is poor.

[0031] Based on the above findings, an embodiment of the present application provides a burner that can at least to some extent solve the technical problem of poor material reduction efficiency when using traditional burners to heat materials.

[0032] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0033] For the convenience of the following description, the X direction, Y direction and Z direction are defined respectively, and the X direction, Y direction and Z direction are perpendicular to each other. After the burner 100 is installed on the rotary hearth furnace, the height direction of the burner 100 is the Z direction, the width direction is the X direction, the length direction is the Y direction, and the plane where the X direction and the Y direction are located is a horizontal plane.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the burner 100 has an air inlet 100a and a plurality of air nozzles 100b connected to the air inlet 100a, and also has a gas inlet 100c and a plurality of gas nozzles 100d connected to the gas inlet 100c; the plurality of air nozzles 100b and the plurality of gas inlets 100c are arranged at intervals along the X direction, and the air nozzles 100b and the gas inlet 100c are arranged at intervals along the Z direction; the air inlet 100a is used to communicate with air, and the gas inlet 100c is used to communicate with gas.

[0035] like Figure 1 As shown, a plurality of air nozzles 100b are arranged in a row in sequence along the X direction, and a plurality of gas nozzles 100d are also arranged in a row in sequence along the X direction, and the two rows are arranged at intervals in the Z direction. After the burner 100 is installed on the rotary hearth furnace, the gas nozzle 100d is located below the air nozzle 100b, and the material is located below the gas nozzle 100d. The plurality of gas nozzles 100d are arranged at intervals along the X direction, so that the plurality of gas nozzles 100d spray flat gas, which will become an air curtain that isolates the material from the air sprayed by the air nozzle 100b, and isolates the air and the material during the combustion process, so that the material can be heated and in an oxygen-free environment, providing a good non-oxidizing atmosphere for the material, meeting the heating and reduction requirements of the material, and improving the reduction efficiency of the material.

[0036] In some embodiments, the axis of the air nozzle 100b is arranged along the Y direction. In this way, after the burner 100 is installed on the rotary hearth furnace, the axis of the air nozzle 100b is parallel to the horizontal plane, and the air nozzle 100b sprays horizontally. The applicant found that if the axis of the air nozzle 100b sprays upward along the Z direction, problems such as uneven mixing of air and coal gas and incomplete combustion are likely to occur. If the axis of the air nozzle 100b sprays downward along the Z direction, the sprayed air is easy to pass through the coal gas curtain and contact the material, and cannot provide a good non-oxidizing atmosphere for the material. Setting the axis of the air nozzle 100b along the Y direction can provide a good non-oxidizing atmosphere for the material while ensuring good uniformity of the mixing of coal gas and air.

[0037] In some embodiments, the axis of the gas nozzle 100d is 0° to 3° with the Y direction.

[0038] 0°~3° includes 0° and 3°. With this design, after the burner 100 is installed on the rotary hearth furnace, the angle α between the axis of the gas nozzle 100d and the horizontal plane is 0°~3°. When it is 0°, the axis of the gas nozzle 100d is arranged along the Y direction, parallel to the horizontal plane, and the gas is ejected along the horizontal plane, which helps the gas curtain formed by the gas nozzle 100d to have better stability and is not easily agitated by air. When the angle between the gas nozzle 100d and the Y direction is greater than 0° and less than or equal to 3°, the gas ejected from the gas nozzle 100d is ejected upward along the Z direction, which will help to improve the uniformity of the mixing of gas and air.

[0039] In some embodiments, along the Z direction, multiple air nozzles 100b are arranged in one-to-one correspondence with multiple gas nozzles 100d. That is, the number of air nozzles 100b and gas nozzles 100d is the same, and each air nozzle 100b is located above each gas nozzle 100d. Such a design will help to make the gas and air mix more evenly and ensure efficient combustion of the gas.

[0040] In some embodiments, the burner 100 includes an air guide assembly 110, a gas guide assembly 120, and a connector 130. The air guide assembly 110 has an air inlet 100a and an air nozzle 100b, and the air guide assembly 110 is used to connect to an air pipeline for transmitting air; the gas guide assembly 120 has a gas inlet 100c and a gas nozzle 100d, and the gas guide assembly 120 is used to connect to a gas pipeline for transmitting gas; the connector 130 is connected to the air guide assembly 110 and the gas guide assembly 120.

[0041] The air guide assembly 110 is connected to the air pipeline, and after the connection, the air inlet 100a of the air guide assembly 110 and the outlet of the air pipeline are butted and connected. The gas guide assembly 120 is connected to the gas pipeline, and after the connection, the gas inlet 100c of the gas guide assembly 120 and the outlet of the gas pipeline are butted and connected. The connecting piece 130 fixedly connects the air guide assembly 110 and the gas guide assembly 120 together. With this design, the air guide assembly 110 and the gas guide assembly 120 can be processed separately. After the two are processed separately, they are connected together through the connecting piece 130 to form the burner 100, which facilitates the processing of the burner 100.

[0042] In some embodiments, the air guide assembly 110 is connected to the air pipeline via a flange, and the gas guide assembly 120 is connected to the gas pipeline via a flange.

[0043] In some embodiments, the air guide assembly 110 includes an air guide 111 and a plurality of air nozzles 112 mounted on the air guide 111. The air guide 111 is used to connect with an air duct. The air guide 111 has an air inlet 100a, and the air nozzle 112 has an air outlet 100b. The air inlet 100a and the air outlet 100b are connected through an air channel 100e provided on the air guide 111 and the air nozzle 112. The air discharged from the air outlet of the air duct enters the air channel 100e through the air inlet 100a, and is finally ejected from the air outlet 100b under the guidance of the air channel 100e.

[0044] In some embodiments, the air guide 111 includes a first air guide section 1111, a second air guide section 1112 and a third air guide section 1113 which are connected in sequence; the air nozzle 112 is installed on the third air guide section 1113, the first air guide section 1111 has an air inlet 100a and is used to be connected to the air duct; the air channel 100e includes a first air channel 100e1, a second air channel 100e2, a third air channel 100e3 and a fourth air channel 100e4 which are respectively opened on the first air guide section 1111, the second air guide section 1112, the third air guide section 1113 and the air nozzle 112 and are connected in sequence; the cross-section of the first air channel 100e1 is circular, the cross-section of the third air channel 100e3 is rectangular, and the cross-sectional area of ​​the second air channel 100e2 gradually increases along the air flow direction.

[0045] The cross section of the air duct is usually circular. Setting the cross section of the first air channel 100e1 to be circular can facilitate the connection between the first air guide section 1111 and the air duct. The cross section of the third air channel 100e3 is rectangular, so that the multiple air nozzles 112 arranged at intervals along the X direction can all be connected to the third air channel 100e3. Along the air flow direction, the cross-sectional area of ​​the second air channel 100e2 gradually increases, so that the air discharged from the first air channel 100e1 can be evenly distributed in the third air channel 100e3 under the guidance of the second air channel 100e2, so that the air in the third air channel 100e3 is evenly ejected through each air nozzle 100b, ensuring the uniformity of air distribution.

[0046] In some embodiments, the gas guide assembly 120 includes a gas guide member 121 and a plurality of gas nozzles 122 installed on the gas guide member 121. The gas guide member 121 is used to connect with a gas pipeline. The gas guide member 121 has a gas inlet 100c, and the gas nozzle 122 has a gas nozzle 100d. The gas inlet 100c and the gas nozzle 100d are connected through a gas channel 100f provided on the gas guide member 121 and the gas nozzle 122. The gas discharged from the gas outlet of the gas pipeline enters the gas channel 100f through the gas inlet 100c, and is finally sprayed out from the gas nozzle 100d under the guidance of the gas channel 100f.

[0047] In some embodiments, the gas guide 121 includes a first gas guide section 1211, a second gas guide section 1212 and a third gas guide section 1213 which are connected in sequence; the gas nozzle 122 is installed on the third gas guide section 1213, the first gas guide section 1211 has a gas inlet 100c and is used to be connected to a gas pipeline; the gas channel 100f includes a first gas channel 100f1, a second gas channel 100f2, a third gas channel 100f3 and a fourth gas channel 100f4 which are respectively opened on the first gas guide section 1211, the second gas guide section 1212, the third gas guide section 1213 and the gas nozzle 122 and are connected in sequence; the cross section of the first gas channel 100f1 is circular, the cross section of the third gas channel 100f3 is rectangular, and the cross section area of ​​the second gas channel 100f2 gradually increases along the gas flow direction.

[0048] The cross section of the gas pipeline is usually circular. Setting the cross section of the first gas channel 100f1 to be circular can facilitate the connection between the first gas guide section 1211 and the gas pipeline. The cross section of the third gas channel 100f3 is rectangular, so that the multiple gas nozzles 122 arranged at intervals along the X direction can all be connected to the third gas channel 100f3. Along the gas flow direction, the cross-sectional area of ​​the second gas channel 100f2 gradually increases, so that the gas discharged from the first gas channel 100f1 can be evenly distributed in the third gas channel 100f3 under the guidance of the second gas channel 100f2, so that the gas in the third gas channel 100f3 is evenly ejected through each gas nozzle 100d, ensuring the uniformity of gas distribution.

[0049] In some embodiments, along the Y direction, the air guide 111 and the gas guide 121 are arranged at intervals.

[0050] In some embodiments, along the Y direction, the connecting member 130 is located between the air guide member 111 and the gas guide member 121 , and is welded to the air guide member 111 and the gas guide member 121 .

[0051] In some embodiments, a plurality of connecting members 130 are spaced apart along the X direction, and the connecting members 130 are plate-shaped.

[0052] In some embodiments, the first air channel 100e1, the second air channel 100e2, the first gas channel 100f1 and the second gas channel 100f2 are all arranged along the Z direction. The fourth air channel 100e4 and the fourth gas channel 100f4 are arranged along the Y direction. Along the Z direction, the fourth air channel 100e4 is located below the second air channel 100e2, and the third air channel 100e3 is in an arc shape. Along the Z direction, the fourth gas channel 100f4 is located below the second gas channel 100f2, and the third gas channel 100f3 is in an arc shape.

[0053] In some embodiments, the burner 100 further includes a mounting member 140 , which is mounted on at least one of the air guide assembly 110 , the gas guide assembly 120 and the connector 130 , and is used to connect to the furnace body. The burner 100 is fixed to the rotary hearth furnace via the mounting member 140 .

[0054] In some embodiments, the mounting member 140 is provided with a plurality of avoidance holes, and the mounting member 140 is sleeved outside the air nozzle 112 and the gas nozzle 122 through the avoidance holes, and is fixedly connected to the third air guide section 1113 and the third gas guide section 1213. The mounting member 140 is also provided with a plurality of bolt mounting holes, and the mounting member 140 and the rotary hearth furnace are fixedly connected by bolts disposed in the bolt mounting holes.

[0055] In some embodiments, the mounting member 140 is in the shape of a rectangular plate, and a circle of bolt mounting holes is provided on the mounting member 140 at intervals along the edge of the mounting member 140 .

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0057] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0058] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A burner, characterized in that: The invention comprises an air inlet (100a) and a plurality of air nozzles (100b) connected to the air inlet (100a), and a gas inlet (100c) and a plurality of gas nozzles (100d) connected to the gas inlet (100c); the plurality of air nozzles (100b) and the plurality of gas inlets (100c) are arranged at intervals along the X direction, and the air nozzles (100b) and the gas inlet (100c) are arranged at intervals along the Z direction; the air inlet (100a) is used to communicate with air, and the gas inlet (100c) is used to communicate with gas.

2. The burner according to claim 1, characterized in that: The axis of the air nozzle (100b) is arranged along the Y direction.

3. The burner according to claim 1, characterized in that: The axis of the gas nozzle (100d) is 0-3° with the Y direction.

4. The burner according to claim 1, characterized in that: Along the Z direction, the plurality of air nozzles (100b) and the plurality of gas nozzles (100d) are arranged in one-to-one correspondence.

5. The burner according to any one of claims 1 to 4, characterized in that: The burner (100) comprises: An air guide assembly (110) having the air inlet (100a) and the air nozzle (100b), and used for connecting to an air duct for transmitting air; A coal gas flow guide assembly (120), comprising the coal gas inlet (100c) and the coal gas nozzle (100d), and used for connecting to a coal gas pipeline for transmitting coal gas; A connecting member (130) is connected to the air guide component (110) and the gas guide component (120).

6. The burner according to claim 5, characterized in that The air guide assembly (110) comprises an air guide member (111) and a plurality of air nozzles (112) mounted on the air guide member (111); the air guide member (111) is used to be connected to the air duct; the air guide member (111) has the air inlet (100a); the air nozzles (112) have the air outlets (100b); the air inlet (100a) and the air outlets (100b) are connected via air channels (100e) provided on the air guide member (111) and the air nozzles (112).

7. The burner according to claim 6, characterized in that The air guide member (111) comprises a first air guide section (1111), a second air guide section (1112) and a third air guide section (1113) which are connected in sequence; the air nozzle (112) is installed on the third air guide section (1113); the first air guide section (1111) has the air inlet (100a) and is used to be connected to the air duct; the air channel (100e) comprises two air guide sections (1111), a first air guide section (1112) and a second air guide section (1113) which are respectively opened on the first air guide section (1111), the second air guide section (1112) and the third air guide section (1113); ... The air flow section (1112), the third air guide section (1113) and the air nozzle (112) are connected in sequence to a first air channel (100e1), a second air channel (100e2), a third air channel (100e3) and a fourth air channel (100e4); the cross section of the first air channel (100e1) is circular, the cross section of the third air channel (100e3) is rectangular, and along the air flow direction, the cross-sectional area of ​​the second air channel (100e2) gradually increases.

8. The burner according to claim 5, characterized in that The gas guide assembly (120) comprises a gas guide member (121) and a plurality of gas nozzles (122) mounted on the gas guide member (121); the gas guide member (121) is used to be connected to the gas pipeline; the gas guide member (121) has the gas inlet (100c); the gas nozzle (122) has the gas nozzle (100d); the gas inlet (100c) and the gas nozzle (100d) are connected via a gas channel (100f) provided on the gas guide member (121) and the gas nozzle (122).

9. The burner according to claim 8, characterized in that The gas guide member (121) comprises a first gas guide section (1211), a second gas guide section (1212) and a third gas guide section (1213) which are connected in sequence; the gas nozzle (122) is installed on the third gas guide section (1213); the first gas guide section (1211) has the gas inlet (100c) and is used to be connected to the gas pipeline; the gas channel (100f) comprises a first gas guide section (1211), a second gas guide section (1212) and a third gas guide section (1213) which are respectively opened on the first gas guide section (1211), the second gas guide section (1212) and the third gas guide section (1213); ... The guide section (1212), the third gas guide section (1213) and the gas nozzle (122) are connected in sequence to a first gas channel (100f1), a second gas channel (100f2), a third gas channel (100f3) and a fourth gas channel (100f4); the first gas channel (100f1) has a circular cross section, the third gas channel (100f3) has a rectangular cross section, and along the gas flow direction, the cross-sectional area of ​​the second gas channel (100f2) gradually increases.

10. The burner according to claim 5, characterized in that The burner (100) further comprises a mounting member (140), wherein the mounting member (140) is mounted on at least one of the air guide assembly (110), the gas guide assembly (120) and the connecting member (130), and the mounting member (140) is used to be connected to a furnace body.

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