A three-phase co-injection pulverized coal burner

Abstract

The present invention discloses a three-phase co-injection pulverized coal burner, comprising a burner head, an adapter and a burner body connected in sequence; the burner body comprises a multi-stage channel formed by a multi-layer sleeve structure being sleeved in sequence, and the multi-stage channel is a pulverized coal channel, an oxygen channel, a water channel and a cooling water jacket from the inside to the outside; the burner head comprises a pulverized coal outlet channel, an oxygen outlet channel and a water outlet channel provided with an atomizer which are sleeved in sequence from the inside to the outside; the adapter comprises a circular adapter body, a pulverized coal through hole arranged at the center of the adapter body, a plurality of oxygen through holes, a plurality of water through holes, a plurality of cooling water inlet through holes and a plurality of cooling water outlet through holes. The present invention changes the oxygen-steam mixed feed into oxygen and water separate feeds, thereby reducing the oxygen supply temperature, which can greatly reduce the material grade of the related oxygen supply path and save the device construction cost.

Description

Technical Field

[0001] The invention belongs to the technical field of coal gasification and relates to a pulverized coal burner, in particular to a three-phase co-injection pulverized coal burner. Background Art

[0002] In the field of coal chemical industry, especially in the field of dry coal powder pressurized gasification, the pulverized coal process burner is the key equipment of the entire gasification device. The main function of the pulverized coal process burner is to pass the mixture of coal powder and oxygen and superheated steam carried by gas (nitrogen or carbon dioxide) into the gasifier at a certain temperature and pressure for reaction. For the supply of oxygen and superheated steam, the feed temperature of the pipeline needs to be increased to above 180°C, and the steam needs to be guaranteed to be superheated steam to avoid dew point corrosion, which will cause damage to the supply pipeline and related equipment. However, as the temperature rises, the design level of related equipment and pipelines will inevitably increase exponentially, and the pressure level of the equipment and the requirements for the materials used will be greatly increased. According to conservative estimates, the cost of a single oxygen steam mixed supply pipeline is at least 2 million yuan. Summary of the invention

[0003] In view of the defects and shortcomings in the prior art, the present invention provides a three-phase co-injection pulverized coal burner, which overcomes the defects of the existing pulverized coal burner equipment such as complex structure and high cost.

[0004] To achieve the above object, the present invention adopts the following technical scheme:

[0005] A three-phase co-injection pulverized coal burner comprises a burner head, a transition piece and a burner body connected in sequence;

[0006] The burner body comprises a multi-stage channel formed by a multi-layer sleeve structure arranged in sequence, and the multi-stage channel is a pulverized coal channel, an oxygen channel, a water channel and a cooling water jacket from the inside to the outside; the cooling water jacket comprises a cooling water inlet channel and a cooling water outlet channel arranged from the inside to the outside;

[0007] The burner head includes a pulverized coal outlet channel, an oxygen outlet channel and a water outlet channel provided with an atomizer, which are sequentially sleeved from the inside to the outside; an annular groove at the end of the cooling water inlet channel and an annular groove at the end of the cooling water outlet channel, which are interconnected, are provided on the outer ring of the water outlet channel;

[0008] The adapter includes a circular adapter body, a pulverized coal through hole arranged at the center of the adapter body and capable of being connected to the pulverized coal channel and the pulverized coal outlet channel respectively, a plurality of oxygen through holes arranged around the pulverized coal through hole and capable of being connected to the oxygen channel and the oxygen outlet channel, a plurality of water through holes arranged around the oxygen through hole and capable of being connected to the water channel and the water outlet channel, a plurality of cooling water inlet through holes arranged around the water through hole and capable of being connected to the cooling water inlet channel and the annular groove at the end of the cooling water inlet channel, and a plurality of cooling water outlet through holes arranged around the cooling water inlet through hole and capable of being connected to the cooling water outlet channel and the annular groove at the end of the cooling water outlet channel.

[0009] The present invention also includes the following technical features:

[0010] Specifically, the pulverized coal channel, oxygen channel, water channel and cooling water jacket are all coaxially arranged;

[0011] The pulverized coal outlet channel, the oxygen outlet channel, the water outlet channel, the annular groove at the end of the cooling water inlet channel and the annular groove at the end of the cooling water outlet channel are all coaxially arranged;

[0012] The pulverized coal through hole is located at the center of the adapter body, and multiple oxygen through holes, multiple water through holes, multiple cooling water inlet through holes and multiple cooling water outlet through holes are respectively located on a circle with the center of the adapter body as the center; the radii of the circles where the oxygen through holes, water through holes, cooling water inlet through holes and cooling water outlet through holes are located increase successively.

[0013] Specifically, both ends of the pulverized coal through hole are provided with a first annular protrusion which is coaxial and has the same radius as the pulverized coal through hole. The first annular protrusions on both sides of the adapter can be respectively welded to the end of the channel side wall forming the pulverized coal channel and the end of the channel side wall forming the pulverized coal outlet channel, to ensure that the channel formed by the pulverized coal channel, the pulverized coal through hole and the pulverized coal outlet channel is a sealed channel for passing pulverized coal.

[0014] Specifically, a second annular protrusion with the center of the adapter as the center is provided between the oxygen through hole and the water through hole, and the second annular protrusions on both sides of the adapter can be respectively welded to the end of the channel side wall forming the oxygen channel and the end of the channel side wall forming the oxygen outlet channel, to ensure that the channel formed by the oxygen channel, the oxygen through hole and the oxygen outlet channel is a sealed channel for passing oxygen.

[0015] Specifically, a third annular protrusion with the center of the adapter as the center is provided between the water through hole and the cooling water inlet through hole. The third annular protrusions on both sides of the adapter can be welded to the end of the channel side wall forming the water channel and the end of the channel side wall forming the water outlet channel respectively, ensuring that the channel formed by the water channel, the water through hole and the water outlet channel is a sealed channel for passing water.

[0016] Specifically, a fourth annular protrusion with the center of the adapter as the center is provided between the cooling water inlet through hole and the cooling water outlet through hole, and the fourth annular protrusions on both sides of the adapter can be respectively welded to the end of the channel side wall forming the cooling water inlet channel and the end of the ring groove side wall forming the ring groove at the end of the cooling water inlet channel, so as to ensure that the channel formed by the cooling water inlet channel, the cooling water inlet through hole and the ring groove at the end of the cooling water inlet channel is a sealed channel for passing cooling water;

[0017] A fifth annular protrusion with the center of the adapter as the center is provided on the outer circle of the cooling water outlet through hole, and the fifth annular protrusions on both sides of the adapter can be respectively welded to the end of the channel side wall forming the cooling water outlet channel and the end of the annular groove side wall forming the annular groove at the end of the cooling water outlet channel, to ensure that the channel formed by the cooling water outlet channel, the cooling water outlet through hole and the annular groove at the end of the cooling water outlet channel is a sealed channel for passing cooling water.

[0018] Specifically, a pulverized coal inlet flange is provided at the entrance of the pulverized coal channel; an oxygen inlet and an oxygen inlet flange provided on the oxygen inlet are provided on the oxygen channel; a water inlet and a water inlet flange provided on the water inlet are provided on the water channel; a cooling water inlet and a cooling water inlet flange provided on the cooling water inlet are provided on the cooling water inlet channel; a cooling water outlet and a cooling water outlet flange provided on the cooling water outlet are provided on the cooling water outlet channel; and a mounting flange coaxial with the burner body is provided on the outer wall of the cold water outlet channel.

[0019] Specifically, the central axes of the oxygen inlet flange, the water inlet flange, the cooling water inlet flange and the cooling water outlet flange are all perpendicular to the central axis of the burner body.

[0020] Specifically, the structure of the atomizer arranged in the water outlet channel is a fin structure evenly distributed along the circumference, and the thickness of the fin is 1 to 3 mm; the number of fins is 20 to 40, and each fin has an angle of 10 to 40 degrees with the axial direction, which can make the water fully swirl in the channel and then spray out of the burner.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] (I) The present invention introduces a water channel into the burner to replace the steam in the oxygen-steam mixture. Through this change, the oxygen-steam mixed feed can be changed to a separate feed of oxygen and water, thereby reducing the oxygen supply temperature from 180°C to 25°C, which can greatly reduce the material grade of the related oxygen supply line and save the construction cost of the device; and the oxygen supply pipeline will no longer be subject to dew point corrosion, ensuring the safe operation of the device.

[0023] (II) In the present invention, the burner head and the burner body are welded through an adapter. This structure is convenient for the maintenance and cutting of the burner and is beneficial for ensuring the concentricity of the burner.

[0024] (III) The mouth gap of the water outlet channel of the present invention is 0.5-2mm, which is conducive to the formation of a water film. An atomizing swirl structure is arranged in the water channel, specifically a welded fin type or an integral milling groove structure, which is conducive to the stability of the pressure and flow of the water entering the furnace.

[0025] (IV) The present invention can greatly reduce the supply temperature of the burner oxygen pipeline, which will significantly improve both the economy and safety. The water channel can not only use common process water, but also pass industrial wastewater for combustion in the gasifier, which is more conducive to the complete conversion of impurities in the water under the high temperature and high pressure conditions of the gasifier. It can become an effective way for enterprises to treat their own industrial wastewater. Only the orientation of part of the burner nozzle is adjusted, and the channel inside the burner is readjusted. The main structure of the burner and the docking size with the gasifier are not changed. The owner's existing equipment is slightly modified and there is no damage. At the same time, the advantages of the original burner design are inherited. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the adapter of the present invention;

[0028] Figure 3 It is a schematic diagram of the connection structure between the adapter and the burner head of the present invention;

[0029] Figure 4 It is a partial enlarged view of the burner head of the present invention;

[0030] Figure 5 It is a schematic diagram of the burner body structure of the present invention;

[0031] Figure 6 It is a schematic diagram of the connection between the adapter and the burner body of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the atomizer of the present invention;

[0033] The reference numerals in the figure are: 1-burner head, 2-adapter, 3-burner body, 4-atomizer;

[0034] 11- pulverized coal outlet channel, 12- oxygen outlet channel, 13- water outlet channel, 141- annular groove at the end of cooling water inlet channel, 142- annular groove at the end of cooling water outlet channel;

[0035] 20-adapter body, 21-pulverized coal through hole, 211-first annular protrusion, 22-oxygen through hole, 221-second annular protrusion, 23-water through hole, 231-third annular protrusion, 24-cooling water inlet through hole, 241-fourth annular protrusion, 25-cooling water outlet through hole, 251-fifth annular protrusion;

[0036] 31- pulverized coal channel, 311- pulverized coal inlet flange, 32- oxygen channel, 321- oxygen inlet, 322- oxygen inlet flange, 33- water channel, 331- water inlet, 332- water inlet flange, 34- cooling water jacket, 341- cooling water inlet channel, 3411- cooling water inlet, 3412- cooling water inlet flange, 342- cooling water outlet channel, 3421- cooling water outlet, 3422- cooling water outlet flange, 35- mounting flange. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0038] like Figures 1 to 7 As shown, a three-phase co-injection pulverized coal burner comprises a burner head 1, an adapter 2 and a burner body 3 connected in sequence; the burner body 3 comprises a multi-stage channel formed by a multi-layer sleeve structure sleeved in sequence, and the multi-stage channel is a pulverized coal channel 31, an oxygen channel 32, a water channel 33 and a cooling water jacket 34 from the inside to the outside; the cooling water jacket 34 comprises a cooling water inlet channel 341 and a cooling water outlet channel 342 sleeved from the inside to the outside; the burner head 1 comprises a pulverized coal outlet channel 11, an oxygen outlet channel 12 and a water outlet channel 13 provided with an atomizer 4 sleeved in sequence from the inside to the outside; an annular groove 141 at the end of the cooling water inlet channel and an annular groove 142 at the end of the cooling water outlet channel which are interconnected are provided on the outer circle of the water outlet channel 13; the adapter 2 comprises a pulverized coal outlet channel 11, an oxygen outlet channel 12 and a water outlet channel 13 provided with an atomizer 4 ... which are sleeved from the inside to the outside; an annular groove 141 at the end The adapter body 20 includes a circular adapter body 20, a pulverized coal through hole 21 arranged at the center of the adapter body 20 and capable of communicating with the pulverized coal channel 31 and the pulverized coal outlet channel 11 respectively, a plurality of oxygen through holes 22 arranged around the pulverized coal through hole 21 and capable of communicating with the oxygen channel 32 and the oxygen outlet channel 12, a plurality of water through holes 23 arranged around the oxygen through hole 22 and capable of communicating with the water channel 33 and the water outlet channel 13, a plurality of cooling water inlet through holes 24 arranged around the water through hole 23 and capable of communicating with the cooling water inlet channel 341 and the annular groove 141 at the end of the cooling water inlet channel, and a plurality of cooling water outlet through holes 25 arranged around the cooling water inlet through hole 24 and capable of communicating with the cooling water outlet channel 342 and the annular groove 142 at the end of the cooling water outlet channel.

[0039] In this embodiment, the oxygen outlet channel 12 of the burner head 1 has a conical conical structure at the outlet, and the channel gap of the oxygen outlet channel 12 at the outlet becomes smaller, which is conducive to accelerating the oxygen to be ejected and sprayed toward the center position forward; the water outlet channel 13 has a conical conical structure at the outlet, and the mouth gap of the water outlet channel 13 is 0.5-2mm, which is conducive to the formation of a water liquid film and spraying toward the center position forward.

[0040] The pulverized coal channel 31, the oxygen channel 32, the water channel 33 and the cooling water jacket 34 are all coaxially arranged; the pulverized coal outlet channel 11, the oxygen outlet channel 12, the water outlet channel 13, the cooling water inlet channel end annular groove 141 and the cooling water outlet channel end annular groove 142 are all coaxially arranged; the pulverized coal through hole 21 is located at the center of the adapter body 20, and the multiple oxygen through holes 22, the multiple water through holes 23, the multiple cooling water inlet through holes 24 and the multiple cooling water outlet through holes 25 are respectively located on a circle with the center of the adapter body 20 as the center; the radii of the circles where the oxygen through holes 22, the water through holes 23, the cooling water inlet through holes 24 and the cooling water outlet through holes 25 are located increase successively.

[0041] Both ends of the pulverized coal through hole 21 are provided with first annular protrusions 211 which are coaxial and have the same radius as the pulverized coal through hole 21. The first annular protrusions 211 on both sides of the adapter can be welded to the end of the channel side wall forming the pulverized coal channel 31 and the end of the channel side wall forming the pulverized coal outlet channel 11 respectively, to ensure that the channel formed by the pulverized coal channel 31, the pulverized coal through hole 21 and the pulverized coal outlet channel 11 is a sealed channel for passing pulverized coal.

[0042] A second annular protrusion 221 with the center of the adapter 20 as the center is provided between the oxygen through hole 22 and the water through hole 23. The second annular protrusions 221 on both sides of the adapter can be respectively welded to the end of the channel side wall forming the oxygen channel 32 and the end of the channel side wall forming the oxygen outlet channel 12, to ensure that the channel formed by the oxygen channel 32, the oxygen through hole 22 and the oxygen outlet channel 12 is a sealed channel for passing oxygen.

[0043] A third annular protrusion 231 with the center of the adapter 20 as the center is provided between the water through hole 23 and the cooling water inlet through hole 24. The third annular protrusions 231 on both sides of the adapter 20 can be respectively welded to the end of the channel side wall forming the water channel 33 and the end of the channel side wall forming the water outlet channel 13, to ensure that the channel formed by the water channel 33, the water through hole 23 and the water outlet channel 13 is a sealed channel for passing water.

[0044] A fourth annular protrusion 241 with the center of the adapter 20 as the center is provided between the cooling water inlet through hole 24 and the cooling water outlet through hole 25. The fourth annular protrusions 241 on both sides of the adapter 20 can be respectively welded to the end of the channel side wall forming the cooling water inlet channel 341 and the end of the annular groove side wall forming the annular groove 141 at the end of the cooling water inlet channel, so as to ensure that the channel formed by the cooling water inlet channel 341, the cooling water inlet through hole 24 and the annular groove at the end of the cooling water inlet channel 141 is used to pass the cooling water. A sealed channel; a fifth annular protrusion 251 with the center of the adapter 20 as the center is provided on the outer circle of the cooling water outlet through hole 25, and the fifth annular protrusions 251 on both sides of the adapter 20 can be respectively welded to the channel side wall ends forming the cooling water outlet channel 342 and the annular groove side wall ends forming the annular groove 142 at the end of the cooling water outlet channel, ensuring that the channel formed by the cooling water outlet channel 342, the cooling water outlet through hole 25 and the annular groove 142 at the end of the cooling water outlet channel is a sealed channel for passing cooling water.

[0045] A pulverized coal inlet flange 311 is provided at the entrance of the pulverized coal channel 31; an oxygen inlet 321 and an oxygen inlet flange 322 provided on the oxygen inlet 321 are provided on the oxygen channel 32; a water inlet 331 and a water inlet flange 332 provided on the water inlet 331 are provided on the water channel 33; a cooling water inlet 3411 and a cooling water inlet flange 3412 provided on the cooling water inlet 3411 are provided on the cooling water inlet channel 341; a cooling water outlet 3421 and a cooling water outlet flange 3422 provided on the cooling water outlet 3421 are provided on the cooling water outlet channel 342; and a mounting flange 35 coaxial with the burner body 3 is provided on the outer wall of the cold water outlet channel 342.

[0046] The central axes of the oxygen inlet flange 322, the water inlet flange 332, the cooling water inlet flange 3412 and the cooling water outlet flange 3422 are all perpendicular to the central axis of the burner body 3, which is convenient for connecting the oxygen source, water source and cooling water source.

[0047] like Figure 7 As shown, the structure of the atomizer 4 arranged in the water outlet channel 13 is a fin structure evenly distributed along the circumference of the outer wall of the oxygen outlet channel, and the thickness of the fin is 1 to 3 mm; the number of fins is 20 to 40, and each fin has an angle of 10 to 40 degrees with the axial direction, which can make the water fully swirl in the channel and then spray out of the burner.

[0048] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0050] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A three-phase pulverized coal burner, characterized in that: It comprises a burner head (1), an adapter (2) and a burner body (3) which are connected in sequence; The burner body (3) comprises a multi-stage channel formed by sequentially sleeved multi-layer sleeve structures, wherein the multi-stage channel comprises, from the inside to the outside, a pulverized coal channel (31), an oxygen channel (32), a water channel (33) and a cooling water jacket (34); the cooling water jacket (34) comprises a cooling water inlet channel (341) and a cooling water outlet channel (342) which are arranged from the inside to the outside; The burner head (1) comprises a pulverized coal outlet channel (11), an oxygen outlet channel (12) and a water outlet channel (13) provided with an atomizer (4) which are sequentially sleeved from the inside to the outside; an annular groove (141) at the end of a cooling water inlet channel and an annular groove (142) at the end of a cooling water outlet channel which are interconnected are provided on the outer ring of the water outlet channel (13); The adapter (2) comprises a circular adapter body (20), a pulverized coal through hole (21) arranged at the center of the adapter body (20) and capable of being connected to the pulverized coal channel (31) and the pulverized coal outlet channel (11), a plurality of oxygen through holes (22) arranged around the pulverized coal through hole (21) and capable of being connected to the oxygen channel (32) and the oxygen outlet channel (12), a plurality of water through holes (23) arranged around the oxygen through hole (22) and capable of being connected to the water channel (33) and the water outlet channel (13), a plurality of cooling water inlet through holes (24) arranged around the water through hole (23) and capable of being connected to the cooling water inlet channel (341) and the annular groove (141) at the end of the cooling water inlet channel, and a plurality of cooling water outlet through holes (25) arranged around the cooling water inlet through hole (24) and capable of being connected to the cooling water outlet channel (342) and the annular groove (142) at the end of the cooling water outlet channel; The pulverized coal channel (31), the oxygen channel (32), the water channel (33) and the cooling water jacket (34) are all coaxially arranged; The pulverized coal outlet channel (11), the oxygen outlet channel (12), the water outlet channel (13), the annular groove (141) at the end of the cooling water inlet channel, and the annular groove (142) at the end of the cooling water outlet channel are all coaxially arranged; The pulverized coal through hole (21) is located at the center of the adapter body (20); the plurality of oxygen through holes (22), the plurality of water through holes (23), the plurality of cooling water inlet through holes (24) and the plurality of cooling water outlet through holes (25) are respectively located on a circle with the center of the adapter body (20) as the center; the radii of the circles where the oxygen through holes (22), the water through holes (23), the cooling water inlet through holes (24) and the cooling water outlet through holes (25) are located increase in sequence; Both ends of the pulverized coal through hole (21) are provided with first annular protrusions (211) coaxial with and having the same radius as the pulverized coal through hole (21); the first annular protrusions (211) on both sides of the adapter can be respectively welded to the end of the channel side wall forming the pulverized coal channel (31) and the end of the channel side wall forming the pulverized coal outlet channel (11); A second annular protrusion (221) with the center of the adapter body (20) as the center of the circle is provided between the oxygen through hole (22) and the water through hole (23); the second annular protrusions (221) on both sides of the adapter can be respectively welded to the end of the channel side wall forming the oxygen channel (32) and the end of the channel side wall forming the oxygen outlet channel (12).

2. The three-phase co-injection pulverized coal burner according to claim 1, characterized in that: A third annular protrusion (231) with the center of the adapter body (20) as the center of the circle is provided between the water through hole (23) and the cooling water inlet through hole (24); the third annular protrusions (231) on both sides of the adapter body (20) can be respectively welded to the end of the channel side wall forming the water channel (33) and the end of the channel side wall forming the water outlet channel (13).

3. The three-phase co-injection pulverized coal burner according to claim 1, characterized in that: A fourth annular protrusion (241) with the center of the adapter body (20) as the center is provided between the cooling water inlet through hole (24) and the cooling water outlet through hole (25), and the fourth annular protrusions (241) on both sides of the adapter body (20) can be respectively welded to the end of the channel side wall forming the cooling water inlet channel (341) and the end of the annular groove side wall forming the annular groove (141) at the end of the cooling water inlet channel; A fifth annular protrusion (251) with the center of the adapter body (20) as the center is provided on the outer circle of the cooling water outlet through hole (25), and the fifth annular protrusions (251) on both sides of the adapter body (20) can be respectively welded to the end of the channel side wall forming the cooling water outlet channel (342) and the end of the annular groove side wall forming the annular groove (142) at the end of the cooling water outlet channel.

4. The three-phase co-injection pulverized coal burner according to claim 1, characterized in that: A pulverized coal inlet flange (311) is provided at the inlet of the pulverized coal channel (31); an oxygen inlet (321) and an oxygen inlet flange (322) provided on the oxygen inlet (321) are provided on the oxygen channel (32); a water inlet (331) and a water inlet flange (332) provided on the water inlet (331) are provided on the water channel (33); a cooling water inlet (3411) and a cooling water inlet flange (3412) provided on the cooling water inlet (3411) are provided on the cooling water inlet channel (341); a cooling water outlet (3421) and a cooling water outlet flange (3422) provided on the cooling water outlet (3421) are provided on the cooling water outlet channel (342); and a mounting flange (35) coaxial with the burner body (3) is provided on the outer wall of the cooling water outlet channel (342).

5. The three-phase co-injection pulverized coal burner according to claim 4, characterized in that: The central axes of the oxygen inlet flange (322), the water inlet flange (332), the cooling water inlet flange (3412) and the cooling water outlet flange (3422) are all perpendicular to the central axis of the burner body (3).

6. The three-phase co-injection pulverized coal burner according to claim 4, characterized in that: The atomizer (4) arranged in the water outlet channel (13) has a fin structure evenly distributed along the circumference, and the thickness of the fin is 1 to 3 mm; the number of fins is 20 to 40, and each fin has an angle of 10 to 40 degrees with the axial direction, so that water can be fully swirled in the channel and then sprayed out of the burner.

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