Flame arrester provided with Tesla flow channel and suitable for incinerator jet flow burner

Abstract

The flame arrester comprises a flame arrester shell, the flame arrester shell is of a straight-tube-shaped structure with the two ends open, and a plurality of flame arresting core bodies arranged in parallel are arranged in the flame arrester shell in the axial direction; the flame arresting core body is of a cylindrical structure, a hollow one-way gas flow channel is formed in the flame arresting core body, and openings in the two ends of the one-way gas flow channel are arranged to be an inlet and an outlet of the flame arrester respectively; the one-way gas flow channel is arranged to be of an annular Tesla flow channel structure, and the one-way gas flow channel forms two Tesla flow channels symmetrical along the axis along the axial section. The whole structure adopts the form of series connection and parallel connection of the same structure, good expansibility and flexibility are achieved in application, different numbers of fire retardant core bodies can be connected in parallel according to the flow, or the number of stages of the pressure reducing valve can be increased or decreased according to the flow speed and the flow resistance.

Description

Technical Field

[0001] The invention relates to the technical field of combustion devices, in particular to a flame arrester with a Tesla flow channel suitable for an incinerator jet burner. Background Art

[0002] In combustion devices, especially incinerator jet burners, flame arresters are key components for preventing flashbacks. Their performance directly impacts the operational safety and stability of the device. Existing flame arrester core units often utilize a one-way valve in series configuration. This function is achieved by creating a differential resistance between downstream and upstream flow through the geometric configuration of the core's internal flow channel.

[0003] The prior art discloses the use of Tesla flow channels in flame arresters, such as a flame arrester based on a Tesla valve structure disclosed in Application No. CN202111056467.4; and a flame arrester device disclosed in Application No. CN202321854565.7. Both of them are multi-layer plate-shaped Tesla valve structures, and their multi-layer superimposed flow channel structures will cause diversion and disturbance of the forward-flowing air / fuel jet, which may cause the jet to disperse and weaken its directionality. In an incinerator, the concentration of the jet directly affects the mixing efficiency of the fuel and the flue gas. The dispersed jet may cause incomplete local combustion and increase pollutant emissions. In addition, the dead corners of the multi-layer structure may accumulate ash (the flue gas of the incinerator contains a large amount of particulate matter), further weakening the flow channel patency and backfire suppression capabilities.

[0004] Secondly, the existing Tesla flow channel is usually a fixed-angle flow channel design, which is difficult to adapt to the complex working conditions of the incinerator jet burner: when flowing downstream, the gas flow is prone to excessive local resistance due to the rigid setting of the flow channel structure, affecting the combustion efficiency; when flowing upstream, the resistance difference formed by a single geometric configuration is limited, and it is difficult to effectively block the high-speed backfire flame, increasing the risk of backfire spread. On the other hand, the core components of existing flame arresters are mostly made of a single material, and are not specifically designed for high temperature, high flow rate and impurity-containing environments. At the same time, the existing structure lacks the ability to dynamically respond to temperature changes. When backfire occurs, it is impossible to actively adjust the flow channel resistance according to the temperature change. It only relies on the resistance difference of the static structure, which makes it difficult to cope with backfire conditions of different intensities, resulting in insufficient flame arrester reliability.

[0005] In view of the above reasons, it is necessary to propose a flame arrester with a Tesla flow channel suitable for an incinerator jet burner to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a flame arrester with a Tesla flow channel suitable for an incinerator jet burner.

[0007] To achieve the above object, the technical solution of the present invention is as follows: A flame arrester with a Tesla flow channel suitable for an incinerator jet burner, comprising: The flame arrester housing is a straight tubular structure with two ends open, and a plurality of flame arrester cores are arranged in parallel along the axial direction inside the housing; The flame arrester core has a cylindrical structure with a hollow one-way gas flow channel formed inside. The openings at both ends of the one-way gas flow channel are respectively set as the inlet and outlet of the flame arrester; the one-way gas flow channel is set as an annular Tesla flow channel structure, and the cross-section of the one-way gas flow channel along the axial direction forms two Tesla flow channels symmetrical along the axis. The flame arrester core has a rotating body structure; The partition is arranged between the interior of the flame arrester shell and the outer wall of the flame arrester core to form a partition and fix the distribution positions of multiple flame arrester cores.

[0008] Furthermore, the fire-retardant core comprises a core shell, a center body, a first ring body, and a second ring body; The central body is arranged along the central axis of the core shell, and a plurality of outer ring grooves are provided on the inner wall of the core shell; a plurality of inner ring grooves are provided on the outer wall of the central body, and the inner ring grooves and the outer ring grooves are staggered; a first ring body is provided in the outer ring groove, and a second ring body is provided in the inner ring groove, and the outer ring groove and the inner ring groove are both U-shaped annular grooves.

[0009] Furthermore, the angle A between the opening direction of the outer annular groove and the central axis of the fire-retardant core is -20~-30°, and the angle B between the opening direction of the inner annular groove and the central axis of the fire-retardant core is 20~30°, so that the opening directions of the U-shaped annular grooves on the outer annular groove and the inner annular groove and the angles of the central axis are set oppositely.

[0010] Furthermore, a fire-blocking core is composed of multiple one-way valve units connected in series, each one-way valve unit includes an outer annular groove, an inner annular groove, a first ring body, and a second ring body, and the outer annular groove and the inner annular groove are axially offset by half the length of the one-way valve unit; The central body forms a spherical head at the inlet end and a conical head at the outlet end.

[0011] Furthermore, the fire arrester core includes a central core and a surrounding core. The central core is arranged along the central axis of the flame arrester. Multiple surrounding cores are arranged around the periphery of the central core. Several fire arrester cores are compactly arranged in the flame arrester housing.

[0012] Furthermore, a temperature dynamic response structure is provided in the one-way gas flow channel, which includes a shape memory elastic sheet arranged in the U-shaped annular groove, one end of the shape memory elastic sheet is attached to the bottom wall of the U-shaped annular groove to form a fixed end, and the other end is attached to the side wall of the longer side of the U-shaped annular groove to form a free end. When the gas flows normally in the flame arrester, the shape memory elastic sheet is tightly attached to the inner wall of the U-shaped annular groove; when the tempering gas flows back, the free end of the shape memory elastic sheet bends toward the center of the flow channel, so that the flow cross-sectional area of ​​the flow channel is reduced.

[0013] Furthermore, a plurality of shape memory elastic sheets are embedded in the U-shaped annular groove at even intervals along the circumferential direction.

[0014] Furthermore, the core shell and the center body are processed into a structural matrix using a high-temperature resistant alloy, and the surface of the U-shaped annular groove formed on the matrix is ​​covered with a ceramic coating.

[0015] Furthermore, the interiors of the first ring body and the second ring body are both arranged with gradient pores, and the porosity of the first ring body gradually changes from 40% to 20% along the downstream direction; the porosity of the second ring body gradually changes from 20% to 40% along the downstream direction; during tempering, the loose pores of the first ring body and the second ring body form a maze path for the flame passing through the countercurrent, and quench the flame.

[0016] The advantages and beneficial effects of the present invention are: This device adopts a structure of multiple one-way valves, which have the characteristics of small downstream flow resistance and large reverse flow resistance. When used in combustion devices, it can effectively reduce backfire, or when used in other fluid devices, it can reduce the impact of downstream on upstream flow.

[0017] The overall structure adopts the same structure in series and parallel form, which has good scalability and flexibility in application. Different numbers of fire-retardant cores can be connected in parallel according to the flow rate, or the number of pressure reducing valve stages can be increased or decreased according to the flow rate and flow resistance.

[0018] The repetition and periodicity in the structure are conducive to low-cost processing through processes such as 3D additive manufacturing, or high-precision processing of a single pressure reducing valve through traditional processes, and high-precision and large-scale low-cost processing of multiple pressure reducing valves through welding, which has the characteristics of low cost and large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a flame arrester with a Tesla flow channel suitable for an incinerator jet burner according to the present invention; Figure 2 This is an exploded view of a flame arrester with a Tesla flow channel suitable for an incinerator jet burner according to the present invention; Figure 3This is a front view of a flame arrester with a Tesla flow channel suitable for an incinerator jet burner of the present invention. Figure 4 This invention Figure 3 Schematic diagram of the middle AA section; Figure 5 This is a schematic diagram of the forward and reverse flow of the one-way gas flow channel in the present invention; Figure 6 1 is a schematic diagram comparing the shape memory elastic sheet before and after deformation in the present invention; Figure 7 Schematic diagram of the ceramic coating and gradient pores in the present invention.

[0020] In the figure: 1. flame arrester housing; 2. flame arrester core; 3. one-way gas flow channel; 4. inlet; 5. outlet; 6. partition; 7. core housing; 8. center body; 9. first ring body; 10. second ring body; 11. U-shaped annular groove; 12. one-way valve unit; 13. spherical head; 14. conical head; 15. center core; 16. surrounding core; 17. shape memory elastic sheet; 18. fixed end; 19. free end; 20. ceramic coating; 21. gradient pore; 22. outer ring groove; 23. inner ring groove. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described below in conjunction with the examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] Example 1: A flame arrester with a Tesla flow channel for an incinerator jet burner, such as Figure 1-4 As shown, it is composed of multiple fire-blocking cores 2, partitions 6 and flame arrester housings 1, wherein the fire-blocking core 2 is a key component of fire arresting, and a unit of the fire-blocking core 2 is formed by connecting multiple one-way valves (similar to Tesla valves) in series. The unit has a cylindrical structure with openings at both ends of its axial direction, and a hollow one-way gas flow channel 3 is formed inside the unit. The one-way gas flow channel 3 connects the openings at both ends, and the openings at both ends of the one-way gas flow channel 3 are respectively set as the inlet 4 and outlet 5 of the flame arrester. In actual use, the forward and downstream flow direction in the flow channel is from the inlet 4 to the outlet 5; the reverse flow direction in the flow channel is from the inlet 4 to the outlet 5. The flow direction is from the outlet 5 to the inlet 4; it can be understood that the forward flow of the gas in the fire-blocking core 2 unit of this embodiment is not hindered, but in the reverse flow, it is subject to the reverse blocking effect of the Tesla flow channel, and the gas is subject to very large resistance in the reverse flow, thereby achieving the effect of unidirectional flow guidance; in this embodiment, the one-way gas flow channel 3 is set to an annular Tesla flow channel structure, and the cross-section of the one-way gas flow channel 3 along the axial direction forms two Tesla flow channels symmetrical along the axis; and the number of series stages of the one-way valve unit 12 in the fire-blocking core 2 is determined according to the size of the resistance backflow to the inlet.

[0023] An example of the flame arrester is Figure 3 As described above, seven fire-blocking core 2 units of the same size are closely arranged in the flame arrester housing 1 to form a compact structure, wherein the central fire-blocking core 2 unit is located at the central axis of the flame arrester, and the rest are close to it and the two adjacent combined core units are close to each other; thereby, the fire-blocking core 2 is divided into a central core 15 and a surrounding core 16. As described above, the central core 15 is arranged along the central axis of the flame arrester, and a plurality of surrounding cores 16 are arranged around the periphery of the central core 15 (in this embodiment, one is arranged in the center and six are arranged around it as an example). It can be understood that the number of outer ring layers can also be increased. In this embodiment, the fire-blocking cores 2 all adopt the same size. In actual use, fire-blocking cores 2 of different diameters can be used together as needed to form a structure in which several fire-blocking cores 2 are compactly arranged in the flame arrester housing 1.

[0024] Furthermore, the gaps between the fire-blocking core 2 units are sealed by partitions 6 , and each fire-blocking core 2 unit is tightly connected to the partitions 6 to achieve sealing, so that fluid can only flow in and out through the internal channels of the fire-blocking core 2 units.

[0025] The flame arrester housing 1 is used to fix the flame arrester core 2. Flanges and other connecting structures are installed at the front and rear ends of the flame arrester housing 1 to be installed with other components on the combustion device.

[0026] The partition 6 is a circular plate of a predetermined thickness, used to isolate the gaps between the fire arrester cores 2 and the gaps between the fire arrester core 2 units and the flame arrester housing 1, preventing fluid from entering the front and rear ends through these gaps. The diameter of the partition 6 is the same as the inner diameter of the flame arrester housing 1. The partition 6 has multiple circular holes with the same diameter as the outer diameter of the fire arrester core 2. The placement of the holes is consistent with the arrangement of the fire arrester core 2 within the flame arrester. There can be one or more partitions 6. Multiple partitions can better support the fire arrester core 2 and provide higher reliability. If multiple partitions 6 are used, it is sufficient to ensure that only one has a complete isolation function.

[0027] The fire arrester core 2 is cut along the axial section to form two Tesla flow channels symmetrically arranged along the central axis. It can be understood that the Tesla flow channel formed in this embodiment is actually an annular Tesla flow channel arranged around the central axis, so that the fire arrester core 2 has the characteristics of a one-way valve, such as Figure 5 As shown, the airflow has small resistance in the downstream direction and large resistance in the upstream direction.

[0028] In this embodiment, a plurality of one-way valve units 12 are connected in series in one fire-resistant core 2, and have the characteristic of axial periodicity. Each one-way valve unit 12 includes an outer ring annular groove 22, an inner ring annular groove 23, a first ring body 9, and a second ring body 10. The outer ring annular groove 22 and the inner ring annular groove 23 are arranged in an axial position offset by half the length of a one-way valve unit 12, and the number of one-way valves in the fire-resistant core 2 can be flexibly determined according to the application scenario.

[0029] In this embodiment, the fire-resistant core 2 includes a core shell 7, a center body 8, a first ring body 9, and a second ring body 10. Each part is a rotary body structure. The center body 8, the plurality of first ring bodies 9, the plurality of second ring bodies 10, and the core shell 7 are connected by small supports. The small supports inside the core shell 7 maintain the positional relationship between the first ring bodies 9, the second ring bodies 10, and the center body 8 inside the core shell 7, so that the positional relationship of each part is fixed.

[0030] The center body 8 is arranged along the central axis of the core shell 7. The inner wall of the core shell 7 is provided with a plurality of outer ring annular grooves 22. The outer wall of the center body 8 is provided with a plurality of inner ring annular grooves 23, and the inner ring annular grooves 23 are arranged in an offset manner with the outer ring annular grooves 22. The outer ring annular grooves 22 are provided with first ring bodies 9, and the inner ring annular grooves 23 are provided with second ring bodies 10. The outer ring annular grooves 22 and the inner ring annular grooves 23 are U-shaped annular grooves 11.

[0031] As shown in Figure 4 The opening direction of the outer ring annular groove 22 and the central axis of the fire-resistant core 2 form an angle A of -20° to -30°. The opening direction of the inner ring annular groove 23 and the central axis of the fire-resistant core 2 form an angle B of 20° to 30°. The opening direction of the U-shaped annular groove 11 on the outer ring annular groove 22 and the inner ring annular groove 23 is arranged in an opposite manner with the central axis, so that the angle between the inner ring annular groove and the outer ring annular groove and the central axis is exactly opposite, and the two grooves are offset by half the length of a one-way valve in the axial position. One first ring body 9 and one second ring body 10 are arranged in the two annular grooves, respectively. Specifically, the first ring body 9 is arranged inside the outer ring annular groove 22, and the second ring body 10 is arranged inside the inner ring annular groove 23. In this embodiment, in order to reduce the fluid resistance, the center body 8 is designed in the shape of a round ball head 13 and a round cone head 14, respectively, to reduce the flow resistance.

[0032] Embodiment Two: This embodiment is improved on the basis of the first embodiment. In view of the high temperature of 800-1200°C, high flow rate of 10-30m / s, and easy tempering characteristics of the jet burner of the incinerator, the topology optimization of the annular Tesla flow channel in the first embodiment is implemented. This embodiment integrates a temperature dynamic response structure to achieve the dual functions of low resistance in downstream flow, high resistance in reverse flow, and dynamic adaptive fire resistance.

[0033] Specifically, the structure of the flame arrester housing 1 adopts a straight tubular structure with openings at both ends. Its material can be high-temperature resistant stainless steel 310S. Its inner diameter is designed according to the interface size of the incinerator jet burner. In this embodiment, for example, DN150 and a length of 300 mm are provided. Flanges are provided at both ends and are connected to the burner pipe through the flanges to ensure structural stability under high temperatures.

[0034] Several flame arrester cores 2 are connected in parallel within the flame arrester housing 1. These cores are fixed axially. For example, seven cores 2 are centrally symmetrically distributed. Spacers 6 seal the gaps between the cores, allowing gas to flow only through the unidirectional flow channels within the cores 2, preventing short circuits. The flame arrester core 2 unit is the core component of the flame arrester. Its overall structure is a cylindrical body of revolution. In this embodiment, it has a diameter of 50 mm and a length of 250 mm. It consists of a core housing 7, a center body 8, a first ring body 9, and a second ring body 10. Due to its body of revolution configuration, an annular Tesla flow channel is formed within it. The specific design of the annular Tesla flow channel in this embodiment is as follows: eight groups of outer ring U-shaped annular grooves are arranged axially on the inner wall of the core shell 7, with a depth of 8 mm, a width of 10 mm, an angle A with the axis of -25°, and an opening inclined in the countercurrent direction; seven groups of inner ring U-shaped annular grooves are staggered on the outer wall of the central body 8, with a depth of 8 mm, a width of 10 mm, an angle B with the axis of +25°, and an opening inclined in the countercurrent direction, and the inner and outer ring grooves are axially staggered by half the groove length. The first ring body 9 is embedded in the outer ring groove, and the second ring body 10 is embedded in the inner ring groove. Both are made of 310S stainless steel with a thickness of 2mm. They are both designed with a water drop-shaped cross-section, and the tip is facing the outlet 5. The first ring body 9 and the second ring body 10 are arranged as a whole in parallel with the opening angle of the U-shaped annular groove 11 in which they are inserted; and the two form two annular flow channels symmetrical along the axis with the core shell 7 and the center body 8 - when flowing downstream, the gas flows smoothly along the inclination direction of the groove (resistance coefficient ≤ 0.5); when flowing upstream, the backfire flame needs to overcome the "return resistance" of the reverse inclination of the groove (resistance coefficient ≥ 3.0), and the fluid mechanics characteristics of the Tesla valve are used to block the backfire.

[0035] The temperature dynamic response structure in this embodiment includes a shape memory elastic sheet 17, such as Figure 6As shown, specifically, the material used is NiTi-55 alloy, with a phase transition temperature of 300°C, matching the tempering temperature of the incinerator. The shape memory elastic sheet 17 is 0.1mm thick and has a width consistent with the groove width. The specific arrangement is that the longer side wall of the U-shaped annular groove 11 is uniformly embedded with six pieces along the circumference, with each piece spaced 60° apart. The fixed end 18 is laser welded to the bottom wall of the U-shaped annular groove 11, and the free end 19 naturally fits the side wall, and does not occupy the flow channel space when flowing downstream. The response mechanism during use is: when the downstream working condition is normal, such as Figure 6 As shown in the upper middle figure, the gas temperature is ≤200℃, the elastic sheet maintains the low temperature phase (martensite phase), fits tightly to the inner wall of the groove, and the flow channel cross-sectional area remains at the maximum, ensuring the high flow rate requirement of the jet burner. Figure 6 As shown in the lower middle figure, when the tempering gas temperature is ≥300°C, the elastic sheet triggers a phase change (transforming into austenite phase), and the free end 19 bends toward the center of the flow channel with a bending amplitude of about 5 mm, reducing the flow channel cross-sectional area by about 60%. Combined with the inherent resistance of the Tesla flow channel, the total upstream resistance is increased to more than 10 times the downstream resistance, quickly blocking the flame propagation.

[0036] Example 3: Based on Example 1, this embodiment optimizes its materials, ensures structural strength through a high-temperature resistant alloy matrix, and strengthens high-temperature protection through a ceramic coating 20 on the surface of the U-shaped annular groove 11, thereby solving the problem of flow channel failure caused by oxidation, deformation and tempering erosion of traditional metal parts under long-term high temperature.

[0037] The specific improvement to the structural matrix is ​​to use high-temperature resistant alloy processing and selection. The matrix of the core shell 7 and the center body 8 is made of Cr25Ni20 (2520 stainless steel). This alloy contains 25% chromium and 20% nickel. It has excellent oxidation resistance and high-temperature strength below 1000℃, and has a low linear expansion coefficient (about 18×10⁻ at 20~1000℃). 6 / °C), which can reduce thermal deformation at high temperatures and adapt to the precise rotating structure of the flame-retardant core 2. During processing and molding, precision casting and CNC turning are used to ensure the outer ring U-shaped annular groove on the inner wall of the core shell 7 has a depth of 8-10mm and a width of 10-12mm (flexible selection based on design requirements). The geometric accuracy (tolerance ≤±0.1mm) of the inner ring U-shaped annular groove on the outer wall of the center body 8 (the dimensions match the outer ring) is guaranteed. This ensures a close fit with the first and second ring bodies 9, 10, maintaining the unidirectional resistance characteristics of the Tesla flow channel.

[0038] The surface of the U-shaped annular groove 11 is covered with a ceramic coating 20, such as Figure 7As shown in the figure, the coating material is Al2O3-ZrO2 composite ceramic (Al2O3 accounts for 70%, ZrO2 accounts for 30%). This material is resistant to high temperatures (long-term use temperature ≤1600℃), has low thermal conductivity (≤2W / (m・K)), and high hardness (HV≥1500). It can not only block the thermal shock of high-temperature tempering on the metal substrate, but also resist air erosion and particle wear.

[0039] The ceramic coating 20 is formed only on the inner bottom wall and sidewalls of the U-shaped annular groove 11. Its thickness is 0.1 to 0.2 mm and it is applied using plasma spray. The bonding strength between the coating and the metal substrate is ≥50 MPa, ensuring it will not peel off during high-temperature thermal cycles (including the incinerator's startup and shutdown). The coating surface is ground to a roughness of Ra ≤ 1.6 μm, reducing resistance to downstream gas flow.

[0040] After 1000 hours of continuous operation, its high-temperature stability is good, there is no obvious oxidation corrosion in the U-shaped grooves of the core shell 7 and the center body 8, the coating does not peel off, the change in the flow channel geometric dimensions is ≤0.05mm, and the unidirectional resistance characteristics of the Tesla flow channel are maintained (downstream resistance coefficient 0.4~0.6, upstream resistance coefficient 3.5~4.0).

[0041] Building on the aforementioned structure of the rotating flame-retardant core 2, this embodiment achieves material functional gradient through a "high-temperature alloy substrate partially covered with a ceramic coating 20." This approach not only preserves the structural strength and machining precision of the metal, but also provides high-temperature protection to the groove surface through the ceramic coating 20, thus overcoming the conflict between high-temperature resistance and structural stability inherent in traditional single materials. To combat the high-temperature oxidation and tempering impacts of the incinerator, the coating directly acts on the core flow channel area (the U-shaped groove), precisely strengthening protection for vulnerable areas while preventing the coating from interfering with the ring seal and gas flow, making it a perfect match for the demanding operating conditions of jet burners.

[0042] Example 4: As a further improvement of the first embodiment, the first ring body 9 and the second ring body 10 are both sintered with Cr25Ni20 high-temperature alloy fibers. This material is resistant to high temperatures (long-term use temperature ≤ 1100°C) and has high thermal conductivity (≥ 15W / (m·K)). It can withstand the high temperature of the incinerator and quickly absorb flame energy through heat conduction to meet the quenching requirements. In addition, the first ring body 9 and the second ring body 10 are designed with a porosity gradient distribution, such as Figure 7Specifically, the porosity of the first ring body 9 changes uniformly from 40% to 20% along the downstream direction of gas flow (from the flame arrester inlet 4 to the outlet 5). That is, the pores are loose (40%) near the inlet 4 (the downstream front end), and dense (20%) near the outlet 5 (the downstream rear end). The second ring body 10 exhibits an "inverse gradient" to the first ring body 9, with the porosity changing uniformly from 20% to 40% along the downstream direction. That is, the pores are dense (20%) near the inlet 4, and loose (40%) near the outlet 5.

[0043] In downstream operation (normal operation), as gas flows from inlet 4 to outlet 5, the loose end of the first ring body 9 (40% porosity) and the dense end of the second ring body 10 (20% porosity) form a complementary flow path. Gas can flow smoothly through the loose pores of the first ring body 9. Furthermore, the dense end of the second ring body 10, located on the inner side of the flow path (where flow velocity is lower), has minimal impact on overall flow resistance. Measurements show that downstream resistance increases by only 3% to 5% compared to a non-porous ring body, fully meeting the "low downstream resistance" requirement of the original patent.

[0044] Backflow (flashback): When the flame flows back from outlet 5 to inlet 4, it must sequentially pass through the dense end of the first ring body 9 (20% porosity) and the dense end of the second ring body 10 (20% porosity). The dense pores form a complex "maze path," extending the flame's propagation distance. Simultaneously, the high-temperature alloy fibers rapidly absorb the flame's heat through thermal conduction (reducing the flame temperature from over 1000°C to below the fuel's ignition point, such as natural gas, which ignites at approximately 650°C). This achieves a dual barrier effect of "physical isolation + thermal quenching." Combined with the geometric resistance of the Tesla flow channel, this improves backflow flame arrest efficiency by over 40%.

[0045] In view of the high-temperature characteristics of incinerator tempering, the thermal quenching ability of high-temperature alloys and the maze effect of gradient pores 21 are used to accurately enhance the countercurrent fire resistance performance; at the same time, the reverse gradient design avoids the increase of downstream resistance, perfectly adapting to the "high flow rate, low resistance" working requirements of the jet burner.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A flame arrester with a Tesla flow channel suitable for an incinerator jet burner, characterized in that: include: The flame arrester housing is a straight tubular structure with two ends open, and a plurality of flame arrester cores are arranged in parallel along the axial direction inside the housing; The flame arrester core has a cylindrical structure, and a hollow one-way gas flow channel is formed inside. The openings at both ends of the one-way gas flow channel are respectively set as the inlet and outlet of the flame arrester; the one-way gas flow channel is set as an annular Tesla flow channel structure, and the cross-section of the one-way gas flow channel along the axial direction forms two Tesla flow channels symmetrical along the axis; The partition is arranged between the interior of the flame arrester shell and the outer wall of the flame arrester core to form a partition and fix the distribution positions of multiple flame arrester cores.

2. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 1, characterized in that: The fire-retardant core comprises a core shell, a center body, a first ring body, and a second ring body; The central body is arranged along the central axis of the core shell, and a plurality of outer ring grooves are provided on the inner wall of the core shell; a plurality of inner ring grooves are provided on the outer wall of the central body, and the inner ring grooves and the outer ring grooves are staggered; a first ring body is provided in the outer ring groove, and a second ring body is provided in the inner ring groove, and the outer ring groove and the inner ring groove are both U-shaped annular grooves.

3. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 2, characterized in that: The angle A between the opening direction of the outer annular groove and the central axis of the fire-retardant core is -20~-30°, and the angle B between the opening direction of the inner annular groove and the central axis of the fire-retardant core is 20~30°, so that the opening directions of the U-shaped annular grooves on the outer annular groove and the inner annular groove and the angles of the central axis are set oppositely.

4. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 2, characterized in that: A fire-blocking core is composed of multiple one-way valve units connected in series. Each one-way valve unit includes an outer annular groove, an inner annular groove, a first ring body, and a second ring body. The outer annular groove and the inner annular groove are axially offset by half the length of the one-way valve unit. The central body forms a spherical head at the inlet end and a conical head at the outlet end.

5. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 1, characterized in that: The fire arrester core comprises a central core and a surrounding core. The central core is arranged along the central axis of the flame arrester. A plurality of surrounding cores are arranged around the periphery of the central core. The plurality of fire arrester cores are arranged in a compact structure in the flame arrester housing.

6. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 2, characterized in that: The one-way gas flow channel is provided with a temperature dynamic response structure, which includes a shape memory elastic sheet arranged in the U-shaped annular groove. One end of the shape memory elastic sheet is attached to the bottom wall of the U-shaped annular groove to form a fixed end, and the other end is attached to the side wall of the longer side of the U-shaped annular groove to form a free end. When the gas flows normally in the flame arrester, the shape memory elastic sheet is tightly attached to the inner wall of the U-shaped annular groove; when the tempering gas flows back, the free end of the shape memory elastic sheet bends toward the center of the flow channel, thereby reducing the flow cross-sectional area of ​​the flow channel.

7. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 6, characterized in that: The shape memory elastic sheets are embedded in the U-shaped annular groove at regular intervals along the circumferential direction.

8. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 2, characterized in that: The core shell and the center body are processed into a structural matrix using a high-temperature resistant alloy, and the surface of the U-shaped annular groove formed on the matrix is ​​covered with a ceramic coating.

9. The flame arrester with Tesla flow channel suitable for an incinerator jet burner according to claim 8, characterized in that: The interiors of the first and second ring bodies are both arranged with gradient pores, and the porosity of the first ring body gradually changes from 40% to 20% along the downstream direction; the porosity of the second ring body gradually changes from 20% to 40% along the downstream direction; during tempering, the loose pores of the first and second ring bodies form a maze path for the flame passing through the countercurrent, and quench the flame.

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