A flame arrestor device with a Tesla flow channel suitable for jet burners in incinerators

Abstract

This utility model discloses a flame arrestor device with a Tesla flow channel for jet burners in incinerators, comprising: a flame arrestor shell, which is a straight tube structure with openings at both ends, and multiple flame arrestor cores arranged in parallel along the axial direction inside; a flame arrestor core, which is a cylindrical structure, forming a hollow unidirectional gas flow channel inside, with the openings at both ends of the unidirectional gas flow channel being respectively set as the inlet and outlet of the flame arrestor; the unidirectional gas flow channel is configured as an annular Tesla flow channel structure, and the cross-section of the unidirectional gas flow channel along the axial direction forms two Tesla flow channels symmetrical along the axis. The overall structure adopts the same structure in series and parallel, which has good scalability and flexibility in application. Different numbers of flame arrestor 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 velocity and flow resistance.

Description

Technical Field

[0001] This utility model relates to the field of combustion device technology, specifically to a flame arrestor device with a Tesla flow channel suitable for jet burners in incinerators. Background Technology

[0002] In combustion devices, especially incinerator jet burners, flame arresters are key components for preventing backfire, and their performance directly affects the operational safety and stability of the device. Existing flame arresters often employ a series of one-way valves in their core units, using the geometric configuration of the internal flow channels to create a resistance difference between forward and reverse flow, thus achieving the flame arresting function.

[0003] Existing technologies disclose the use of Tesla flow channels in flame arresters, such as a flame arrester based on a Tesla valve structure disclosed in application number CN202111056467.4; and a flame arresting device disclosed in application number CN202321854565.7. Both are multi-layered plate-shaped Tesla valve structures. The multi-layered flow channel structure causes diversion and turbulence in the forward-flowing air / fuel jet, potentially leading to jet dispersion and reduced directionality. In incinerators, the concentration of the jet directly affects the mixing efficiency of fuel and flue gas. Dispersed jets may lead to incomplete combustion in certain areas, increasing pollutant emissions. Furthermore, dead zones in the multi-layered structure may accumulate ash (incinerator flue gas contains a large amount of particulate matter), further weakening the flow channel unobstructedness and backfire suppression capability.

[0004] Secondly, existing Tesla flow channels are typically designed with a fixed angle, making them unsuitable for the complex operating conditions of jet burners in incinerators. In co-current flow, the rigidity of the flow channel structure can cause excessive local resistance, affecting combustion efficiency. In counter-current flow, the limited resistance differences created by the single geometric configuration are insufficient to effectively block high-speed flashback flames, increasing the risk of flashback propagation. Furthermore, the core components of existing flame arresters are mostly made of a single material and are not specifically designed for high-temperature, high-velocity, and impurity-containing environments. Simultaneously, existing structures lack dynamic response to temperature changes. When flashback occurs, they cannot actively adjust the flow channel resistance based on temperature variations, relying solely on static structural resistance differences, which is insufficient to handle flashback conditions of varying intensities, resulting in inadequate flame arrester reliability.

[0005] For the reasons mentioned above, it is necessary to propose a flame arrestor device suitable for jet burners in incinerators with Tesla flow channels to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a flame arrestor device with a Tesla flow channel suitable for jet burners in incinerators.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A flame arrestor device with a Tesla flow channel for jet burners in incinerators, comprising:

[0009] The flame arrester housing is a straight tubular structure with openings at both ends, and multiple flame arrester cores are arranged in parallel along the axial direction inside.

[0010] The flame arrestor core has a cylindrical structure with a hollow unidirectional gas flow channel inside. The two ends of the unidirectional gas flow channel are respectively set as the inlet and outlet of the flame arrestor. The unidirectional gas flow channel is set as an annular Tesla flow channel structure. The cross section of the unidirectional gas flow channel along the axial direction forms two Tesla flow channels symmetrical along the axis. The flame arrestor core has a rotating structure.

[0011] A partition is installed inside the flame arrester housing and between the outer wall of the flame arrester core to form a partition and to fix the distribution position of multiple flame arrester cores.

[0012] Furthermore, the flame-retardant core includes a core shell, a central body, a first ring body, and a second ring body;

[0013] The central body is arranged along the central axis of the core shell, and the inner wall of the core shell is provided with multiple outer ring annular grooves; the outer wall of the central body is provided with multiple inner ring annular grooves, and the inner ring annular grooves are staggered with the outer ring annular grooves; a first ring body is provided in the outer ring annular groove and a second ring body is provided in the inner ring annular groove, and both the outer ring annular groove and the inner ring annular groove are U-shaped annular grooves.

[0014] Furthermore, the angle A between the opening direction of the outer annular groove and the central axis of the flame-arresting core is -20 to -30°, and the angle B between the opening direction of the inner annular groove and the central axis of the flame-arresting core is 20 to 30°, so that the opening directions of the U-shaped annular grooves on the outer and inner annular grooves are set opposite to the angles with the central axis.

[0015] Furthermore, a flame arrestor 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 offset in the axial position by half the length of the one-way valve unit.

[0016] The central body has a spherical head at the inlet and a conical head at the outlet.

[0017] Furthermore, the flame arrestor core includes a central core and surrounding cores. The central core is arranged along the central axis of the flame arrester, and multiple surrounding cores are arranged around the central core. The multiple flame arrestor cores are arranged in a compact layout within the flame arrester housing.

[0018] Furthermore, the unidirectional gas flow channel is equipped with a temperature dynamic response structure, which includes a shape memory elastic sheet disposed in a 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 in the forward direction, the shape memory elastic sheet is tightly attached to the inner wall of the U-shaped annular groove. When the backfire gas flows in the reverse direction, the free end of the shape memory elastic sheet bends towards the center of the flow channel, thereby reducing the flow cross-sectional area of ​​the flow channel.

[0019] Furthermore, several shape memory elastic sheets are evenly spaced and embedded in the U-shaped annular groove along the circumference.

[0020] Furthermore, the core shell and the central body are made of high-temperature resistant alloy to form a structural substrate, and a ceramic coating is formed on the surface of the U-shaped annular groove formed on the substrate.

[0021] Furthermore, both the first and second rings have gradient porosity. The porosity of the first ring gradually changes from 40% to 20% along the downstream direction; the porosity of the second ring gradually changes from 20% to 40% along the downstream direction. During tempering, the loose pores of the first and second rings form a labyrinthine path for the flame flowing against the current and quench the flame.

[0022] The advantages and beneficial effects of this utility model are as follows:

[0023] This device employs a structure with multiple one-way valves. These one-way valves have the characteristics of low flow resistance in the downstream direction and high flow resistance in the reverse direction. When applied to combustion devices, they can effectively reduce backfire. Alternatively, when applied to other fluid devices, they can reduce the downstream flow impact on the upstream flow.

[0024] The overall structure adopts the same structure in series and parallel, which has good scalability and flexibility in application. Different numbers of flame arrestor 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 velocity and flow resistance.

[0025] The repetitive and periodic nature of the structure allows for low-cost processing through processes such as 3D additive manufacturing, or high-precision processing of a single pressure reducing valve through traditional processes. Multiple pressure reducing valves can be processed with high precision and large-scale low cost by welding, resulting in low cost and mass production capabilities. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a flame arrestor device with a Tesla flow channel for jet burners in incinerators, according to this utility model.

[0027] Figure 2This is an exploded view of a flame arrestor device with a Tesla flow channel for a jet burner in an incinerator, according to this utility model.

[0028] Figure 3 This is a front view of a flame arrestor device with a Tesla flow channel suitable for jet burners in incinerators, according to this utility model.

[0029] Figure 4 This is a utility model Figure 3 Schematic diagram of section AA;

[0030] Figure 5 This is a schematic diagram of the unidirectional gas flow channel in the present invention, showing both co-current and counter-current flow.

[0031] Figure 6 This is a schematic diagram showing the shape memory elastic sheet before and after deformation in this utility model;

[0032] Figure 7 This is a schematic diagram of the ceramic coating and gradient pores in this utility model.

[0033] In the diagram: 1. Flame arrester housing; 2. Flame arrester core; 3. One-way gas flow channel; 4. Inlet; 5. Outlet; 6. Baffle; 7. Core housing; 8. Central 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. Central core body; 16. Surrounding core body; 17. Shape memory elastic sheet; 18. Fixed end; 19. Free end; 20. Ceramic coating; 21. Gradient pores; 22. Outer annular groove; 23. Inner annular groove. Detailed Implementation

[0034] The specific embodiments of this utility model will be further described below with reference to examples. These examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0035] Example 1:

[0036] A flame arrestor device with a Tesla flow channel suitable for jet burners in incinerators, such as Figure 1-4As shown, the structure consists of multiple flame arrestor cores 2, baffles 6, and a flame arrester housing 1. The flame arrestor core 2 is the key component for flame arrest. It is a unit composed of multiple one-way valves (similar to Tesla valves) connected in series. It has a cylindrical structure with openings at both ends along its axial direction, and a hollow one-way gas flow channel 3 is formed inside. The one-way gas flow channel 3 connects to the openings at both ends. The two openings 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 flow direction within the channel is from inlet 4 to outlet 5; the reverse flow direction within the channel... The flow direction is from outlet 5 to inlet 4; it can be understood that the forward flow of gas in the flame arrestor core 2 unit of this embodiment is unobstructed, but when flowing in reverse, it is subject to the reverse obstruction effect of the Tesla channel, and the gas is subjected to very large resistance when flowing in reverse, thereby achieving the effect of unidirectional flow; in this embodiment, the unidirectional gas channel 3 is set as an annular Tesla channel structure, and the cross section of the unidirectional gas channel 3 along the axial direction forms two Tesla channels symmetrical along the axis; and the number of series stages of the unidirectional valve unit 12 in the flame arrestor core 2 is determined according to the magnitude of the resistance to return to the inlet.

[0037] An example of the flame arrester Figure 3 As described above, seven flame-arresting core units 2 of the same size are closely arranged within the flame arrester housing 1, forming a compact structure. The central flame-arresting core unit 2 is located at the central axis of the flame arrester, and the other core units are closely adjacent to it, with each pair of adjacent core units closely placed together. Thus, the flame-arresting core 2 is divided into a central core 15 and surrounding cores 16. As mentioned earlier, the central core 15 is arranged along the central axis of the flame arrester, and multiple surrounding cores 16 are arranged around the central core 15 (in this embodiment, one is arranged in the center and six are arranged around the perimeter). It can be understood that the number of outer ring layers can be increased. In this embodiment, all flame-arresting cores 2 are of the same size. In actual use, flame-arresting cores 2 of different diameters can be combined as needed to form a structure in which several flame-arresting cores 2 are arranged compactly within the flame arrester housing 1.

[0038] Furthermore, the gaps between the flame-arresting core 2 units are sealed by the partition 6. Each flame-arresting core 2 unit and the partition 6 are tightly connected to achieve a seal, so that fluid can only flow in and out through the internal channels of the flame-arresting core 2 unit.

[0039] 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 install other components on the combustion device.

[0040] The baffle 6 is a circular plate of a certain thickness, used to isolate the gaps between the flame-arresting cores 2 and the gaps between the flame-arresting 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 baffle 6 is the same as the inner diameter of the flame arrester housing 1, and multiple circular holes are opened inside the baffle 6. The diameter of the circular holes is the same as the outer diameter of the flame-arresting core 2, and the position of the circular holes is consistent with the arrangement of the flame-arresting core 2 inside the flame arrester. There can be one or more baffles 6. Multiple baffles can better support the flame-arresting core 2 and have high reliability. If there are multiple baffles 6, it is sufficient to ensure that only one of them has a complete isolation function.

[0041] When the flame arrestor core 2 is cut along its axial section, it forms two Tesla channels symmetrically arranged along the central axis. It can be understood that the Tesla channels formed in this embodiment are actually annular Tesla channels arranged around the central axis, thus giving the flame arrestor core 2 the characteristics of a one-way valve. Figure 5 As shown, airflow resistance is lower along the downstream direction and higher along the upstream direction.

[0042] In this embodiment, a flame arrestor core 2 is composed of multiple one-way valve units 12 connected in series and has an axial periodicity. Each one-way valve unit 12 includes an outer annular groove 22, an inner annular groove 23, a first ring 9, and a second ring 10. The outer annular groove 22 and the inner annular groove 23 are offset by half the length of the one-way valve unit 12 in the axial position. The number of one-way valves in the flame arrestor core 2 can be flexibly determined according to the application scenario.

[0043] Specifically, in this embodiment, the flame-retardant core 2 includes a core shell 7, a central body 8, a first ring body 9, and a second ring body 10; and each part is a rotating structure. The central body 8, multiple first ring bodies 9, and multiple second ring bodies 10 are connected to the core shell 7 through small brackets. The internal small brackets maintain the positional relationship between the first ring bodies 9, second ring bodies 10, and central body 8 on the inner side of the core shell 7, so that the positional relationship of each part is fixed.

[0044] The central 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 central body 8 is provided with a plurality of inner ring annular grooves 23, and the inner ring annular grooves 23 are staggered with the outer ring annular grooves 22. A first ring body 9 is provided in the outer ring annular groove 22 and a second ring body 10 is provided in the inner ring annular groove 23. Both the outer ring annular groove 22 and the inner ring annular groove 23 are U-shaped annular grooves 11.

[0045] like Figure 4As shown, the opening direction of the outer annular groove 22 forms an angle A of -20° to -30° with the central axis of the flame-arresting core 2, and the opening direction of the inner annular groove 23 forms an angle B of 20° to 30° with the central axis of the flame-arresting core 2. This ensures that the opening directions of the U-shaped annular grooves 11 on the outer and inner annular grooves 22 and 23 are at opposite angles to the central axis, resulting in opposite angles between the inner and outer annular grooves and the axis. Furthermore, the two grooves are axially offset by half the length of a one-way valve. Each of the two annular grooves contains a first ring 9 and a second ring 10. Specifically, the first ring 9 is located inside the outer annular groove 22, and the second ring 10 is located inside the inner annular groove 23. In this embodiment, to reduce fluid resistance, the central body 8 of the flame-arresting core 2 is designed as a spherical head 13 and a conical head 14, respectively, to reduce flow resistance.

[0046] Example 2:

[0047] This embodiment is an improvement on the first embodiment. Targeting the high temperature (800-1200℃) and high flow velocity (10-30m / s) and easy backfire characteristics of the jet burner in the incinerator, this embodiment incorporates an integrated temperature dynamic response structure in addition to the topology optimization of the annular Tesla flow channel in the first embodiment. This achieves the dual functions of low resistance in the forward flow, strong resistance in the reverse flow, and dynamic adaptive flame arrestor.

[0048] 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, it is DN150 with a length of 300mm. Flanges are set at both ends and connected to the burner pipe through the flanges to ensure structural stability at high temperatures.

[0049] Several flame-arresting cores 2 are connected in parallel inside the flame arrester housing 1. The flame-arresting cores 2 are fixed along the axial direction. Taking seven flame-arresting cores 2 as an example, they are centrally symmetrically distributed. The gaps between the cores are sealed by the partition 6, so that the gas can only flow through the unidirectional flow channel of the flame-arresting core 2, avoiding short circuits. The flame-arresting core 2 unit is the core component of the flame arrester. Its overall structure is a cylindrical rotating body. In this embodiment, a core with a diameter of 50 mm and a length of 250 mm is used. It is composed of a core housing 7, a central body 8, a first ring 9, and a second ring 10. Because of its rotating body configuration, an annular Tesla flow channel is formed inside. The specific design of the annular Tesla flow channel in this embodiment is as follows: the inner wall of the core shell 7 is provided with eight sets of outer ring U-shaped annular grooves at axial intervals, with a depth of 8mm, a width of 10mm, an angle A of -25° with the axis, and the openings are inclined towards the counterflow direction; the outer wall of the central body 8 is provided with seven sets of inner ring U-shaped annular grooves at offset, with a depth of 8mm, a width of 10mm, an angle B of +25° with the axis, and the openings are inclined towards the counterflow direction, and the inner and outer ring grooves are axially offset by half the groove length. The first ring 9 is embedded in the outer groove, and the second ring 10 is embedded in the inner groove. Both are made of 310S stainless steel with a thickness of 2mm and have a teardrop-shaped cross-section design with their tips facing the outlet 5. The opening angle of the first ring 9 and the second ring 10 is parallel to that of the U-shaped annular groove 11 into which they are placed. The two, together with the core shell 7 and the central body 8, form two symmetrical annular flow channels along the axis. When flowing in the same direction, the gas flows smoothly along the inclined direction of the groove (resistance coefficient ≤0.5). When flowing against the current, the backfire flame needs to overcome the "reverse resistance" of the groove's reverse inclination (resistance coefficient ≥3.0) and use the hydrodynamic characteristics of the Tesla valve to block the backfire.

[0050] The temperature dynamic response structure in this embodiment includes a shape memory elastic sheet 17, such as Figure 6 Specifically, the material used is NiTi-55 alloy with a phase transformation temperature of 300℃, matching the tempering temperature of the incinerator. The shape memory elastic sheet 17 has a thickness of 0.1mm and a width consistent with the groove width. The specific arrangement is as follows: six sheets are evenly embedded circumferentially along the longer sidewall of the U-shaped annular groove 11, spaced 60° apart. The fixed end 18 is laser-welded to the bottom wall of the U-shaped annular groove 11, while the free end 19 naturally conforms to the sidewall, not occupying flow channel space during downstream operation. The response mechanism during use is as follows: during normal operation in downstream conditions, if... Figure 6 As shown in the upper middle diagram, the gas temperature is ≤200℃, the elastic sheet maintains the low-temperature phase (martensitic phase), tightly conforms to the inner wall of the groove, and the flow channel cross-sectional area is kept at its maximum to ensure the high flow rate requirement of the jet burner. When backfire occurs under countercurrent conditions, as... Figure 6As shown in the lower middle diagram, the tempering gas temperature is ≥300℃, the elastic sheet triggers a phase transformation (converting to the austenitic phase), and the free end 19 bends towards the center of the flow channel with a bending amplitude of about 5mm, which reduces the cross-sectional area of ​​the flow channel by about 60%. Combined with the inherent resistance of the Tesla flow channel, the total reverse flow resistance is increased to more than 10 times the forward flow resistance, which quickly blocks the flame propagation.

[0051] Example 3:

[0052] Based on Example 1, this embodiment optimizes the materials by using a high-temperature resistant alloy matrix to ensure structural strength and a ceramic coating 20 on the surface of the U-shaped annular groove 11 to enhance high-temperature protection, thus solving the problem of flow channel failure caused by oxidation, deformation and tempering erosion of traditional metal parts under long-term high temperatures.

[0053] The specific improvements to the structural matrix are as follows: high-temperature resistant alloys are used in processing and selection. The matrix of the core shell 7 and the central body 8 is made of Cr25Ni20 (2520 stainless steel). This alloy contains 25% chromium and 20% nickel, and has excellent oxidation resistance and high-temperature strength below 1000℃, and a low coefficient of linear expansion (approximately 18×10⁻ at 20~1000℃). 6 / ℃), which can reduce thermal deformation at high temperatures and adapt to the precision rotating structure of the flame-retardant core 2. During processing and forming, precision casting and CNC turning are used to ensure the dimensions of the outer U-shaped annular groove on the inner wall of the core shell 7, with a depth of 8~10mm and a width of 10~12mm (which can be flexibly selected according to design needs), and the geometric accuracy (tolerance ≤ ±0.1mm) of the inner U-shaped annular groove on the outer wall of the center body 8 (the size matches the outer ring), ensuring a tight fit with the first ring body 9 and the second ring body 10, and maintaining the unidirectional resistance characteristics of the Tesla flow channel.

[0054] The surface of the U-shaped annular groove 11 is covered with a ceramic coating 20, such as Figure 7 As shown, the coating material is an Al2O3-ZrO2 composite ceramic (70% Al2O3 and 30% ZrO2). This material is resistant to high temperature (long-term operating 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 to the metal substrate, but also resist airflow erosion and particle wear.

[0055] The ceramic coating 20 is formed only on the inner bottom wall and two side walls of the U-shaped annular groove 11, with a thickness of 0.1~0.2mm. The coating process uses plasma spraying, and the bonding strength between the coating and the metal substrate is ≥50MPa, ensuring that it does not peel off during high-temperature thermal cycling (including the start-up and shutdown process of the incinerator). The coating surface is ground to a roughness Ra≤1.6μm to reduce resistance to the co-current gas flow.

[0056] After 1000 hours of continuous operation, it exhibits good high-temperature stability. The U-shaped grooves of the core shell 7 and the central body 8 show no obvious oxidation or corrosion, the coating does not peel off, and the change in the geometric dimensions of the flow channel is ≤0.05mm. It maintains the unidirectional resistance characteristics of the Tesla flow channel (coefficient of resistance in the downstream direction is 0.4~0.6, and coefficient of resistance in the upstream direction is 3.5~4.0).

[0057] This embodiment, based on the aforementioned rotating flame-arresting core 2 structure, achieves material functional gradient through "partial coverage of a high-temperature resistant alloy substrate with a ceramic coating 20"—preserving both the structural strength and processing precision of the metal, while the ceramic coating 20 imparts high-temperature protection capabilities to the groove surface, overcoming the contradiction between high-temperature resistance and structural stability inherent in traditional single-material systems. Addressing the high-temperature oxidation and tempering impact of the incinerator, the coating directly acts on the core area of ​​the flow channel (U-shaped groove), precisely strengthening the protection of vulnerable parts while avoiding any impact on the annular seal and gas flow, perfectly adapting to the harsh operating conditions of the jet burner.

[0058] Example 4:

[0059] As a further improvement to Embodiment 1, both the first ring 9 and the second ring 10 are sintered from Cr25Ni20 high-temperature alloy fibers. This material is heat-resistant (long-term operating temperature ≤1100℃) and has high thermal conductivity (≥15W / (m・K)). It can withstand the high temperature of the incinerator and can also quickly absorb flame energy through heat conduction to meet the quenching requirements. Furthermore, the first ring 9 and the second ring 10 are designed with a porosity gradient distribution, such as... Figure 7 As shown, specifically, the first annulus 9 has a porosity that gradually decreases from 40% to 20% along the gas flow direction (from the flame arrester inlet 4 to the outlet 5). That is, the porosity is loose (40%) near the inlet 4 (front end of the flow) and dense (20%) near the outlet 5 (rear end of the flow). The second annulus 10 has a "reverse gradient" with the first annulus 9, and its porosity gradually decreases from 20% to 40% along the flow direction. That is, the porosity is dense (20%) near the inlet 4 and loose (40%) near the outlet 5.

[0060] In co-current flow (normal operation): When gas flows from inlet 4 to outlet 5, the loose end (40% porosity) of the first annular body 9 and the dense end (20% porosity) of the second annular body 10 form a "complementary flow path"—the gas can smoothly pass through the loose pores of the first annular body 9, while the dense end of the second annular body 10, located inside the flow channel (in a lower velocity region), has minimal impact on the overall resistance. Actual measurements show that compared to a non-porous annular body, the co-current resistance increases by only 3% to 5%, fully meeting the original patent's requirement of "low co-current resistance."

[0061] Counterflow condition (backfire occurs): When the flame flows counterflow from outlet 5 to inlet 4, it must pass through the dense end (20% porosity) of the first annulus 9 and the dense end (20% porosity) of the second annulus 10 in sequence. The dense pores form a complex "maze path," extending the flame propagation distance. At the same time, the high-temperature alloy fibers rapidly absorb the flame heat through thermal conduction (reducing the flame temperature from above 1000℃ to below the fuel ignition point, such as the natural gas ignition point of about 650℃), achieving a dual blocking effect of "physical barrier + thermal quenching." Combined with the geometric resistance of the Tesla flow channel, the counterflow flame arresting efficiency is improved by more than 40%.

[0062] In response to the high-temperature characteristics of incinerator reheating, the thermal quenching capability of high-temperature alloys and the labyrinth effect of gradient pores 21 are used to precisely enhance the counter-current flame-retardant performance; at the same time, the reverse gradient design avoids the increase of downstream resistance, perfectly matching the working requirements of jet burners for "high flow rate and low resistance".

[0063] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A flame arrestor device with a Tesla flow channel for jet burners in incinerators, characterized in that, include: The flame arrester housing is a straight tubular structure with openings at both ends, and multiple flame arrester cores are arranged in parallel along the axial direction inside. The flame arrestor core has a cylindrical structure with a hollow unidirectional gas flow channel inside. The two ends of the unidirectional gas flow channel are respectively set as the inlet and outlet of the flame arrestor. The unidirectional gas flow channel is set as an annular Tesla flow channel structure, and the cross section of the unidirectional gas flow channel along the axial direction forms two Tesla flow channels symmetrical along the axis. A partition is installed inside the flame arrester housing and between the outer wall of the flame arrester core to form a partition and to fix the distribution position of multiple flame arrester cores.

2. A flame arrestor suitable for use in a jet burner of an incinerator having a Tesla flow channel according to claim 1, characterised in that, The flame-retardant core includes a core shell, a central body, a first ring body, and a second ring body; The central body is arranged along the central axis of the core shell, and the inner wall of the core shell is provided with multiple outer ring annular grooves; the outer wall of the central body is provided with multiple inner ring annular grooves, and the inner ring annular grooves are staggered with the outer ring annular grooves; a first ring body is provided in the outer ring annular groove and a second ring body is provided in the inner ring annular groove, and both the outer ring annular groove and the inner ring annular groove are U-shaped annular grooves.

3. A flame arrestor suitable for use in a jet burner of an incinerator having a Tesla flow channel according to claim 2, characterised in that, The opening direction of the outer annular groove is at an angle A of -20 to -30° with the central axis of the flame-arresting core, and the opening direction of the inner annular groove is at an angle B of 20 to 30° with the central axis of the flame-arresting core, so that the opening directions of the U-shaped annular grooves on the outer and inner annular grooves are set opposite to the angles with the central axis.

4. A flame arrestor suitable for use in a jet burner of an incinerator having a Tesla flow channel according to claim 2, characterized in that, A flame arrestor 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 offset by half the length of the one-way valve unit in the axial position. The central body has a spherical head at the inlet and a conical head at the outlet.

5. A flame arrestor device with a Tesla flow channel for a jet burner in an incinerator according to claim 1, characterized in that, The flame arrestor core includes a central core and surrounding cores. The central core is arranged along the central axis of the flame arrester, and multiple surrounding cores are arranged around the outer periphery of the central core. The several flame arrestor cores are arranged in a compact layout within the flame arrester housing.

6. A flame arrestor suitable for use in a jet burner of an incinerator having a Tesla flow channel according to claim 2, characterized in that, The unidirectional gas flow channel is equipped with a temperature dynamic response structure, which includes a shape memory elastic sheet disposed in a 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 in the forward direction, the shape memory elastic sheet is tightly attached to the inner wall of the U-shaped annular groove. When the backfire gas flows in the reverse direction, the free end of the shape memory elastic sheet bends towards the center of the flow channel, thereby reducing the flow cross-sectional area of ​​the flow channel.

7. A flame arrestor for use in a jet burner of an incinerator having a Tesla channel as claimed in claim 6, wherein The shape memory elastic sheet has several pieces evenly spaced along the circumference within the U-shaped annular groove.

8. A flame arrestor for use in a flame jet burner having a Tesla channel for a furnace according to claim 2, characterized in that, The core shell and the central body are made of high-temperature resistant alloy to form a structural substrate, and a ceramic coating is formed on the surface of the U-shaped annular groove formed on the substrate.

9. A flame arrestor for use in a flue gas injection burner having a Tesla flow path according to claim 8, wherein, The first ring body and the second ring body are both provided with gradient porosity, the porosity of the first ring body gradually changes from 40% to 20% along the downstream direction, and the porosity of the second ring body gradually changes from 20% to 40% along the downstream direction; when tempering, the loose porosity of the first ring body and the second ring body forms a labyrinth path for the flame passing in the opposite direction, and quenches the flame.

Images