A detonation-type flame arrestor

Abstract

The application provides a detonation type flame arrester, which comprises a cylindrical main cavity, a flame arrester unit arranged in the axial middle part of the main cavity, filling grid units symmetrically arranged on the axial two sides of the flame arrester unit and fixedly connected with the main cavity, and a flame arrester filler filled between the flame arrester unit and the filling grid units; wherein the filling grid units and the flame arrester filler can form a gas shunt under normal working conditions, so that the gas passes through the flame arrester unit at a predetermined flow rate, and can absorb the heat of detonation flame and the energy of detonation shock wave under the flame arrester working condition, so as to attenuate the detonation flame and prevent the flame from passing through the flame arrester unit.

Description

Technical Field

[0001] This invention belongs to the field of flame arrester technology, specifically relating to a detonation-type flame arrester. Background Technology

[0002] Flame arresters are crucial facilities for preventing the spread of flames. Once ignited inside a pipe, the flame velocity accelerates as it propagates. Flame propagation can generally be categorized into deflagration propagation or detonation propagation. In particular, when detonation propagation occurs, the flame velocity can reach thousands of meters per second, and the peak explosion pressure can reach hundreds of times the initial pressure, resulting in immense destructive power.

[0003] Most flame arresters currently consist of a flame arrester housing and a flame arresting unit. The flame arresting unit is typically composed of multiple layers of stainless steel corrugated plates. The flame arrester mainly relies on the heat transfer effect and wall effect of the flame arresting unit to cool the flame and quench free radicals. Because the flame arresting unit affects the pressure resistance of the flame arrester, the diameter of the flame arrester housing is generally 1.5 to 2 times or more the diameter of the connecting pipe. This results in a large space inside the flame arrester housing. During normal operation, the housing contains a significant amount of combustible gas. In the event of a combustion explosion, this large amount of combustible gas will increase the combustion and explosion energy within the flame arrester, thus raising the explosion-proof requirements and making flame arrest more difficult. This not only results in higher maintenance and repair costs for the flame arrester but also may cause the device to malfunction.

[0004] Meanwhile, the large flame arrester housing causes gas to concentrate in the central area of ​​the flame arrester unit during normal flow, with only a small amount of gas passing through the periphery of the flame arrester unit, resulting in a large pressure drop and hindering gas flow efficiency.

[0005] Currently, the flame arrestor performance and flow performance of existing flame arrestor products are two contradictory aspects, often requiring the sacrifice of one aspect to improve the other.

[0006] Chinese patent document CN111097118B discloses a flow-dispersing, low-pressure-drop, large-diameter flame arrester, comprising an upper shell and a lower shell, with the upper shell located directly above the lower shell. Both the upper and lower shells have multiple mounting holes spaced evenly in a circumferential direction. An air inlet is located on the upper side of the upper shell, and an air outlet is located on the lower side of the lower shell. Both the air inlet and outlet have threaded interfaces inside, and each of the two threaded interfaces has a flow-dividing mechanism for differentiating the flow rate. A connecting flange is fixedly connected to the lower side of the upper shell. However, this flow-dispersing, low-pressure-drop, large-diameter flame arrester cannot simultaneously improve its flame-arresting performance while enhancing its flow performance.

[0007] Chinese patent document CN110314306A discloses a bidirectional detonation-resistant flame arrester, comprising a housing, two housings, a flame-arresting component between the housings, a shock wave absorbing device between the housings and the flame-arresting component, and a buffer chamber inside the housing. The detonation shock wave is depressurized and decelerated in the buffer chamber, protecting the flame-arresting component. This invention uses the shock wave absorbing device to create a backflow of the shock wave within the buffer chamber, braking the flame shock wave. The shock wave velocity and pressure cancel each other out, thereby attenuating the detonation shock wave and reducing the impact on the flame-arresting component. However, this bidirectional detonation-resistant flame arrester cannot simultaneously improve its flame-arresting performance while enhancing its flow performance.

[0008] Chinese patent document CN104274929A discloses a detonation-type flame arrester, belonging to the technical field of pipeline safety equipment. It includes a housing, a flame arrester, and pipe fittings. The housings are bolted together, and a flame arrester is installed between the housings. A buffer device is provided between the pipe fittings and the flame arrester plate, and the edge of the buffer device has a ring of through holes. This detonation-type flame arrester cannot simultaneously improve its flame-arresting performance while enhancing its flow performance.

[0009] To address the aforementioned problems, this invention proposes a novel flame arrester that can improve both flow performance and flame-retardant performance. Summary of the Invention

[0010] To address the technical problems described above, this invention aims to provide a detonation-type flame arrester that can improve its flame-arresting performance while enhancing its flow performance, and can also effectively improve its active absorption capability of detonation shock waves, significantly reducing the damage caused by detonation impact.

[0011] To this end, the present invention provides a detonation-type flame arrester, comprising: a cylindrical main cavity; a flame arresting unit disposed in the main cavity and located at the axial center; a filling grid unit symmetrically arranged on both axial sides of the flame arresting unit and fixedly connected to the main cavity; and a flame arresting filler filled between the flame arresting unit and the filling grid unit; wherein, the filling grid unit and the flame arresting filler can divert gas under normal operating conditions, allowing gas to pass through the flame arresting unit at a predetermined flow rate, and can absorb the heat of the detonation flame and the energy of the detonation shock wave under flame arresting conditions, thereby attenuating the detonation flame and preventing the flame from passing through the flame arresting unit.

[0012] In this embodiment, under normal operating conditions, the filling grid unit and the flame-arresting filler divert the gas flow, allowing the gas medium to pass through the flame-arresting unit uniformly, thereby significantly reducing the gas flow resistance and greatly improving the flow performance of the detonation type flame arrester.

[0013] Under flame arrestor conditions, after the combustible gas is ignited within the connecting pipe, the detonation flame sequentially passes through the connecting cavity, the filling grid unit, and the flame arrestor filler. Firstly, because the flame arrestor filler has a certain volume, it reduces the amount of combustible gas in the main cavity. Simultaneously, the combustible gas is divided into multiple small spaces by the flame arrestor filler, thus reducing the explosive force of the detonation flame upon reaching these spaces. Secondly, because the flame arrestor filler has a large specific surface area, it can further absorb the heat of the detonation flame. Thirdly, the filling grid unit and the flame arrestor filler divide the detonation flame, absorbing its heat and the energy of the detonation shock wave, significantly attenuating the flame. Furthermore, the flame arrestor filler deforms under the impact of the detonation flame, further absorbing the energy of the detonation shock wave. Therefore, the detonation flame is significantly attenuated. The attenuated flame reaches the flame arrestor unit, where the heat transfer and wall effects of the flame arrestor unit effectively stop the flame. This greatly improves the flame arresting performance and flow performance of the detonation-type flame arrestor.

[0014] In one embodiment, the predetermined flow rate is within the range of 60%-100% of the design flow rate.

[0015] In one embodiment, the main cavity has connecting cavities at both ends. The diameter of the main cavity is smaller than the diameter of the connecting cavities. The main cavity has connecting portions at both ends for connecting the connecting cavities. The diameter of the connecting portions is set to decrease axially outward from the ends of the connecting cavities.

[0016] In one embodiment, the filling grid unit is fixed on the inner wall of the connecting part and located at one end near the connecting cavity.

[0017] In one embodiment, the flow area S3 of the filling grid unit is greater than the flow area S2 of the connecting cavity.

[0018] In one embodiment, the porosity of the fire-retardant filler is greater than 0.6.

[0019] In one embodiment, support units are provided on both axial sides of the flame arrester unit and fixedly connected to the inner wall of the main cavity for fixing the flame arrester unit.

[0020] In one embodiment, the flame arrestor unit is configured as a disk of uniform thickness.

[0021] In one embodiment, the flame arrestor unit is configured to include a first sub-flame arrestor unit in an annular shape and a second sub-flame arrestor unit disposed at the center of the first sub-flame arrestor unit.

[0022] In one embodiment, a cylindrical partition unit is provided between the filling grid unit and the second sub-fire arrestor unit along the axial direction. The side wall of the cylindrical partition unit is provided with a gas flow channel, and the fire arrestor filler is filled inside the cylindrical partition unit.

[0023] In one embodiment, the diameter of the inner axial end of the cylindrical partition unit is not less than the diameter of the outer axial end.

[0024] In one embodiment, the gas flow channel is configured as an axially extending strip groove or a circumferentially extending annular groove.

[0025] In one embodiment, the thickness of the first sub-flame arrester is less than the thickness of the second sub-flame arrester, and the gap values ​​of the first sub-flame arrester and the second sub-flame arrester are the same.

[0026] In one embodiment, the thickness of the first sub-fire arresting unit is equal to the thickness of the second sub-fire arresting unit, and the gap value of the first sub-fire arresting unit is greater than the gap value of the second sub-fire arresting unit.

[0027] In one embodiment, the fire-retardant filler is coated with a fire-retardant coating or a microwave-absorbing coating.

[0028] In this embodiment, the flame-arresting filler can effectively prevent the propagation of flames or detonation shock waves, further improving the flame-arresting performance of the detonation-type flame arrester.

[0029] In one embodiment, the flame-retardant filler is an adsorption-type filler that can adsorb inert gases in the gaseous medium under normal operating conditions and release inert gases to assist in flame-retardant operation.

[0030] Compared with the prior art, the advantages of this application are:

[0031] The detonation-type flame arrester of the present invention reduces the amount of combustible gas in the main cavity by setting flame-arresting filler inside the main cavity, and at the same time can achieve spatial segmentation of combustible gas, making it difficult for the flame to form a large-scale propagation connection, thus significantly reducing the combustion and explosion power of the detonation flame. Furthermore, the flame-arresting filler has a large specific surface area, which can effectively absorb the heat of the detonation flame. Simultaneously, the flame-arresting filler deforms under the impact of the detonation flame, which can effectively absorb the energy of the detonation shock wave, improve the active absorption capacity of the detonation shock wave, and thus reduce the destructive power of the detonation impact. These factors allow the detonation flame to be effectively attenuated, and the attenuated flame further passes through the flame-arresting unit, where the heat transfer effect and wall effect of the flame-arresting unit achieve flame arrest. Therefore, by using the flame-arresting filler to achieve active attenuation of the shock wave and spatial segmentation of combustible gas, the flame-arresting performance and flow performance of the detonation-type flame arrester are greatly enhanced. Attached Figure Description

[0032] The present invention will now be described with reference to the accompanying drawings.

[0033] Figure 1 The structure of a detonation-type flame arrester according to Embodiment 1 of the present invention is shown schematically.

[0034] Figure 2 schematically shown Figure 1 The structure of the filled grid unit in the detonation-type flame arrester shown.

[0035] Figure 3 The structure of a detonation-type flame arrester according to Embodiment 2 of the present invention is shown schematically.

[0036] Figure 4 schematically shown Figure 3 The structure of the first embodiment of the cylindrical partition unit in the detonation-type flame arrester shown.

[0037] Figure 5 The structure of a second embodiment of the cylindrical partition unit is schematically shown.

[0038] Figure 6 The structure of the third embodiment of the cylindrical partition unit is schematically shown.

[0039] Figure 7 schematically shown Figure 2 The structure of the first sub-flame arrestor unit in the detonation-type flame arrestor shown.

[0040] Figure 8 schematically shown Figure 2 The structure of the second sub-flame arrestor unit in the detonation-type flame arrestor shown.

[0041] Figure 9 The structure of the detonation-type flame arrester according to Embodiment 3 of the present invention is shown schematically.

[0042] Figure 10 The structure of the flame arresting unit in the detonation-type flame arrester shown in Figure 9 is schematically illustrated.

[0043] The reference numerals in the above figures are as follows:

[0044] 100 - Detonation type flame arrester; 1 - Connecting flange; 2 - Connecting cavity; 3 - Filling grid unit; 4 - Flame arresting filler; 5 - Support unit; 51 - First support unit; 52 - Second support unit; 6 - Flame arresting unit; 61, 610 - First sub-flame arresting unit; 62, 620 - Second sub-flame arresting unit; 7 - Main cavity; 8 - Cylindrical partition unit; 81 - Gas flow channel; 200 - Detonation type flame arrester.

[0045] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0046] The invention will now be described with reference to the accompanying drawings.

[0047] Figure 1 The structure of the detonation-type flame arrester 100 according to the present invention is schematically shown. For example... Figure 1 As shown, the detonation-type flame arrester 100 includes a main cavity 7, a flame-arresting unit 6, a filling grid unit 3, and flame-arresting filler 4. The main cavity 7 has a cylindrical structure. The flame-arresting unit 6 is disposed inside the main cavity 7 and is located at the axial center of the main cavity 7. Two filling grid units 3 are provided, symmetrically arranged on both sides of the flame-arresting unit 6. The filling grid units 3 are fixedly connected to the inner wall of the main cavity 7, and a filling space is formed between the filling grid units 3 and the flame-arresting unit 6 in the axial direction. The flame-arresting filler 4 fills the filling space formed between the flame-arresting unit 6 and the filling grid units 3, and the filling grid units 3 are used to fix the flame-arresting filler 4. Under normal operating conditions, the filled grid unit 3 and the flame-arresting filler 4 can divert the gas flow, allowing it to pass through the flame-arresting unit at a predetermined flow rate, thereby reducing gas flow resistance. Furthermore, under flame-arresting conditions, the filled grid unit 3 and the flame-arresting filler 4 can separate the detonation flame and absorb the heat and energy of the detonation flame and shock wave, significantly attenuating the detonation flame and thus achieving flame arrest through the flame-arresting unit 6. The predetermined flow rate is within the range of 60%-100% of the design flow rate. Therefore, the gas can pass through the flame-arresting unit 6 efficiently, effectively reducing the volume of combustible gas within the flame arrester cavity, thereby reducing explosion energy. This is highly beneficial for improving the flame-arresting performance and flow performance of the detonation-type flame arrester 100.

[0048] like Figure 1 As shown, the main cavity 7 has connecting cavities 2 at both ends for connecting to the main body of the gas storage device. The gas storage device is, for example, a storage tank. The diameter of the connecting cavity 2 is smaller than the diameter of the main cavity 7. The main cavity 7 has connecting portions at both ends for connecting to the connecting cavities 2, and the diameter of the connecting portions decreases axially outward from the ends of the main cavity 7. Thus, the diameter of the inner axial end of the connecting portion is equal to the inner diameter of the main cavity 7, and the diameter of the outer axial end of the connecting portion is equal to the diameter of the connecting cavity 2. Preferably, the connecting portion is integrally formed with the main cavity 7, and the connecting portion is part of the main cavity 7.

[0049] In one embodiment, the free end of the connecting cavity 2 is provided with a connecting flange 1 for connecting to the main body of the gas storage device. Preferably, the connecting cavity 2 and the main body of the gas storage device are connected by a connecting pipe (not shown). The specifications of the connecting cavity 2 are the same as those of the connecting pipe.

[0050] Figure 2 The structure of the filling grid unit 3 is schematically shown. The outer edge dimension of the filling grid unit 3 is slightly larger than the diameter of the connecting cavity 2. The filling grid unit 3 is fixed to the inner wall of the connecting part and is located at the end closer to the connecting cavity 2. The flow area S3 of the filling grid unit 3 is larger than the flow area S2 of the connecting cavity 2. The filling grid unit 3 can effectively fix the flame-retardant filler 4 to prevent the flame-retardant filler 4 from entering the connecting cavity 2 or the main body of the venting device.

[0051] The filling grid unit 3 can be made of materials such as wire mesh, woven mesh, or grid plate. The porosity of the filling grid unit 3 is set such that the flow area S3 of the filling grid unit 3 is greater than the flow area S2 of the connecting cavity 2.

[0052] According to the present invention, the fire-retardant filler 4 is disposed within the filling space formed between the fire-retardant unit 6 and the filling grid unit 3, and the filling grid unit 3 and the fire-retardant unit 4 fix the fire-retardant filler 4. The porosity of the fire-retardant filler 4 is greater than 0.6. Preferably, the porosity of the fire-retardant filler 4 is greater than 0.8. The fire-retardant filler 4 can be, for example, a Pall ring or a Raschig ring.

[0053] In one embodiment, the fire-retardant filler 4 may be coated with a fire-retardant coating or a wave-absorbing coating, thereby enabling the fire-retardant filler 4 to further prevent the propagation of flames or detonation shock waves.

[0054] In one embodiment, the flame-arresting filler 4 can also be an adsorption-type filler. Under normal operating conditions, the adsorption-type filler can adsorb inert gases, such as nitrogen, from the gaseous medium. Under flame-arresting conditions, the adsorption-type filler 4 can release inert gases to assist in flame arrest due to the increase in temperature or pressure. This further improves the flame-arresting performance of the detonation-type flame arrester 100.

[0055] According to the present invention, support units 5 are respectively provided on both axial sides of the flame-arresting filler 4 and fixedly connected to the inner wall of the main cavity 7. The support units 5 are used to fix and install the flame-arresting unit 6. The support units 5 can prevent the flame-arresting unit 6 from being blown out by the detonation wave during a detonation. The support units 5 can be constructed as hollow parts, for example.

[0056] The flame arresting unit 6 can be a corrugated plate flame arresting disc or other filler flame arresting structure. The flame arresting unit 6 is used to arrest the propagation of detonation or deflagration flames.

[0057] The detonation-type flame arrester 100 according to the present invention has a normal flow condition and a flame arresting condition.

[0058] Under normal operating conditions, during normal gas flow, the gas medium sequentially passes through the connecting cavity 2, the filling grid unit 3, the flame-arresting filler 4, the support unit 5, and the flame-arresting unit 6. It then passes through the support unit 5, the flame-arresting filler 4, the filling grid unit 3, and the connecting cavity 2 on the opposite side of the flame-arresting unit 6, thus entering the downstream device or pipeline. Compared to existing flame arresters without the filling grid unit 3 and flame-arresting filler 4, where gas flow is mainly concentrated in the central area of ​​the flame-arresting unit 6, with less gas passing through the peripheral area, resulting in high resistance, this invention uses the filling grid unit 3 and flame-arresting filler 4 to create a diversion effect on the gas medium, allowing it to pass evenly through the flame-arresting unit 6. This significantly reduces gas flow resistance and greatly improves the flow performance of the detonation-type flame arrester 100.

[0059] Under flame-arresting conditions, after the combustible gas is ignited in the connecting pipe, the detonation flame sequentially passes through the connecting cavity 2, the filling grid unit 3, and the flame-arresting filler 4. Firstly, because the flame-arresting filler 4 has a certain volume, it reduces the amount of combustible gas in the main cavity 7. Simultaneously, the combustible gas is divided into multiple small spaces by the flame-arresting filler 4, thus reducing the explosive force of the detonation flame upon reaching these spaces. Secondly, because the flame-arresting filler 4 has a large specific surface area, it can further absorb the heat of the detonation flame. Thirdly, under the impact of the detonation flame, the structure of the flame-arresting filler 4 deforms, further absorbing the energy of the detonation shock wave. Therefore, the detonation flame can be significantly attenuated. The attenuated flame reaches the flame-arresting unit 6, where the flame is stopped by the heat transfer and wall effects of the flame-arresting unit 6.

[0060] The detonation-type flame arrester according to the present invention will be described in detail below with specific embodiments.

[0061] Example 1:

[0062] like Figure 1 As shown, the detonation type flame arrester 100, taking the explosion-proof rating of type IIA as an example, has a specification of DN100.

[0063] The test used a propane-air mixture with a propane MESG value of 0.95 mm.

[0064] The specification of connecting flange 1 is DN100.

[0065] The diameter of the connecting cavity 2 is 100mm.

[0066] like Figure 1As shown, the filling grid unit 3 is placed inside the main cavity 7. The filling grid unit 3 is made of wire mesh with a diameter of 120 mm and a thickness of 2 mm. The porosity of the filling grid unit 3 is 0.9. The flow area S3 of the filling grid unit 3 is larger than the flow area S2 of the connecting cavity 2. The outer edge of the filling grid unit 3 is welded to the inner wall of the connecting part of the main cavity 7.

[0067] The flame-retardant filler 4 is made of stainless steel Pall rings with a diameter of 30 mm. The porosity of the flame-retardant filler 4 is 0.94. In this embodiment, the flame-retardant filler 4 fills the entire filling space formed between the filling grid unit 3 and the flame-retardant unit 6.

[0068] like Figure 1 As shown, the flame arrestor unit 6 is constructed as a disc of uniform thickness. The flame arrestor unit 6 is fixedly installed in the axial center of the main cavity 7 via support units 5. The support units 5 are arranged on both sides of the flame arrestor unit 6 and fixed to the inner wall of the main cavity 7, thus securing the flame arrestor unit and preventing the detonation wave from blasting it out during a detonation. This structure ensures consistent fluid and gas flow throughout the entire flame arrestor unit 6, which is beneficial for increasing gas flow rate.

[0069] The fire-arresting unit 6 uses a corrugated fire-arresting plate with a fire-arresting gap of 0.8mm and a thickness of 30mm.

[0070] Under normal operating conditions, during normal gas flow, the gas medium sequentially passes through the connecting cavity 2, the filling grid unit 3, the flame-arresting filler 4, the support unit 5, and the flame-arresting unit 6. It then passes through the support unit 5, the flame-arresting filler 4, the filling grid unit 3, and the connecting cavity 2 on the opposite side of the flame-arresting unit 6, thus entering the downstream device or pipeline. The filling grid unit 3 and the flame-arresting filler 4 can divert the gas medium, allowing it to pass evenly through the flame-arresting unit 6, significantly reducing gas flow resistance and greatly improving the flow performance of the detonation-type flame arrester 100.

[0071] Under flame-arresting conditions, after the combustible gas is ignited in the connecting pipe, the detonation flame sequentially passes through the connecting cavity 2, the filling grid unit 3, and the flame-arresting filler 4. Firstly, because the flame-arresting filler 4 has a certain volume, it reduces the amount of combustible gas in the main cavity 7. Simultaneously, the combustible gas is divided into multiple small spaces by the flame-arresting filler 4, thus reducing the explosive force of the detonation flame upon reaching these spaces. Secondly, because the flame-arresting filler 4 has a large specific surface area, it can further absorb the heat of the detonation flame. Thirdly, under the impact of the detonation flame, the structure of the flame-arresting filler 4 deforms, further absorbing the energy of the detonation shock wave. Therefore, the detonation flame can be significantly attenuated by the filling grid unit 3 and the flame-arresting filler 4. The attenuated flame reaches the flame-arresting unit 6, where the heat transfer effect and wall effect of the flame-arresting unit 6 achieve flame arrest.

[0072] Example 2:

[0073] like Figure 3 As shown, the explosion-proof flame arrester 200, taking the explosion-proof rating of type IIB3 as an example, has a specification of DN100.

[0074] The test used an ethylene-air mixture with an ethylene MESG value of 0.67 mm.

[0075] The specification of connecting flange 1 is DN100.

[0076] The diameter of the connecting cavity 2 is 100mm.

[0077] like Figure 3 As shown, considering the characteristic that detonation flames are concentrated in the central area of ​​the flame arresting unit, the flame arresting unit is constructed to include a first annular sub-flame arresting unit 61 and a second sub-flame arresting unit 62 arranged in the center of the first sub-flame arresting unit 61. The first sub-flame arresting unit 61 and the second sub-flame arresting unit 62 are respectively fixedly installed at the axial center position of the main cavity 7 through the first support unit 51 and the second support unit 52.

[0078] The diameter of the filling mesh unit 3 is slightly larger than the diameter of the connecting cavity 2. The filling mesh unit 3 is made of wire mesh with a diameter of 120 mm and a thickness of 2 mm. The porosity of the filling mesh unit 3 is 0.9, and its flow area S3 is larger than the flow area S2 of the connecting cavity 2. The outer edge of the filling mesh unit 3 is welded to the inner wall of the connecting part of the main cavity 7.

[0079] A cylindrical partition unit 8 is provided between the filling grid unit 3 and the second sub-flame arrestor unit 62 in the axial direction. Both ends of the cylindrical partition unit 8 are fixedly connected to the filling grid unit 3 and the second sub-flame arrestor unit 62, respectively. Thus, a filling space is formed inside the cylindrical partition unit 8. A gas flow channel 81 is provided on the side wall of the cylindrical partition unit 8, and the flame arrestor filler 41 fills the interior of the cylindrical partition unit 8. The diameter of the inner axial end of the cylindrical partition unit 8 is not less than the diameter of the outer axial end.

[0080] like Figure 4 and Figure 5 As shown, the cylindrical partition unit 8 can be constructed into a cylindrical structure of equal diameter.

[0081] like Figure 6 As shown, the cylindrical partition unit 8 can also be constructed as a conical cylindrical structure with the diameter increasing from the outer end to the inner end of the axial direction.

[0082] The gas flow channel can be constructed as a strip-shaped channel extending along the axial direction or an annular channel extending in the circumferential direction.

[0083] The flame-retardant filler 41 uses flame-retardant Pall rings with a diameter of 25 mm and a porosity of 0.92. The flame-retardant filler 41 completely fills the interior of the cylindrical partition unit 8. This ensures that the flame-retardant filler 41 primarily fills the mainstream propagation direction of the detonation flame. Filling the interior of the cylindrical partition unit 8 causes the flame to be diverted after passing through it, while simultaneously attenuating the detonation wave.

[0084] In Example 2, as Figure 4 , Figure 7 and Figure 8 As shown, the thickness of the first sub-flame arrestor unit 61 is set to be less than the thickness of the second sub-flame arrestor unit 62. For example, the thickness of the first sub-flame arrestor unit 61 is set to 15mm, its inner diameter to 120mm, and its outer diameter to 210mm. The thickness of the second sub-flame arrestor unit 62 is 30mm, and its outer diameter is 120mm. Simultaneously, the gap values ​​of the first and second sub-flame arrestor units 61 and 62 are the same, both being 0.55mm. This structure results in less gas flow at the center of the flame arrestor unit and more flow around the perimeter, thereby significantly increasing the flow around the flame arrestor unit and greatly facilitating gas passage.

[0085] Under normal operating conditions, during normal gas flow, the gas medium passes sequentially through the connecting cavity 2 and the filling grid unit 3. Due to the influence of the flame-arresting filler 41, more gas will choose to pass through the gas flow channel of the cylindrical dividing unit 8, and then through the first sub-flame-arresting unit 61 to the other side of the first sub-flame-arresting unit 61, and then into the downstream device or pipeline. Another portion of the gas will pass through the flame-arresting filler 41 and the second sub-flame-arresting unit 62 to the other side of the second sub-flame-arresting unit 62, and then into the downstream device or pipeline. The presence of the flame-arresting filler 41 results in better flow equalization of the gas entering the main cavity 7 from upstream, fully utilizing the area with smaller pressure drop on the first sub-flame-arresting unit 61 side, thus achieving a smaller pressure drop. This is highly beneficial for improving the flow performance of the detonation-type flame arrester 200.

[0086] Under flame-arresting conditions, after the combustible gas is ignited in the pipeline, the detonation flame sequentially passes through the connecting cavity 2, the filling grid unit 3, and the flame-arresting filler 41. Firstly, because the flame-arresting filler 41 has a certain volume, it reduces the amount of combustible gas in the main cavity 7. Simultaneously, the combustible gas is divided into multiple small spaces by the flame-arresting filler 41, thus reducing the explosive force of the detonation flame upon reaching these spaces. Secondly, because the flame-arresting filler 41 has a large specific surface area, it can further absorb the heat of the detonation flame. Thirdly, under the impact of the detonation flame, the structure of the flame-arresting filler 41 deforms, further absorbing the energy of the detonation shock wave. Therefore, the detonation flame can be significantly attenuated under the action of the filling grid unit 3 and the flame-arresting filler 4. The attenuated flame reaches the second sub-flame-arresting unit 62, where the flame is stopped by the heat transfer and wall effects of the second sub-flame-arresting unit 62. In addition, the flame passing through the cylindrical partition unit 8 is also attenuated to a certain extent, and thus flame arrest is achieved through the first sub-flame arresting unit 61.

[0087] Example 3:

[0088] like Figure 9 As shown, the explosion-proof flame arrester 300, taking the explosion-proof rating of type IIB3 as an example, has a specification of DN100.

[0089] The test used an ethylene-air mixture with an ethylene MESG value of 0.67 mm.

[0090] The specification of connecting flange 1 is DN100.

[0091] The diameter of the connecting cavity 2 is 100mm.

[0092] The only difference between Example 3 and Example 2 is the structure of the flame arrestor unit. For example... Figure 9As shown, considering the characteristic that the detonation flame is concentrated in the central area of ​​the flame arresting unit, the flame arresting unit is constructed to include a first sub-flame arresting unit 610 in a ring shape and a second sub-flame arresting unit 620 arranged in the center of the first sub-flame arresting unit 610. The first sub-flame arresting unit 610 and the second sub-flame arresting unit 620 are fixedly installed in the axial middle position of the main cavity 7 by a first support unit 510.

[0093] The fire-retardant filler 41 uses a flame-retardant Pall ring, which can be coated with a fire-retardant coating. The Pall ring has a diameter of 25 mm and a porosity of 0.92. The fire-retardant filler 41 fills the interior of the cylindrical partition unit 8.

[0094] like Figure 9 and Figure 10 As shown, the thickness of the first sub-flame arresting unit 610 and the thickness of the second sub-flame arresting unit 620 are both set to be equal, 30mm. Simultaneously, the gap value of the first sub-flame arresting unit 610 is set to be greater than the gap value of the second sub-flame arresting unit 620. The gap value of the first sub-flame arresting unit 610 is 0.8mm, and the outer diameter of the first sub-flame arresting unit 610 is set to 210mm, while the inner diameter of the first sub-flame arresting unit 610 is set to 120mm. The gap value of the second sub-flame arresting unit 620 is 0.55mm, and the diameter of the second sub-flame arresting unit 620 is set to 120mm.

[0095] Under normal operating conditions, during normal gas flow, the gas medium passes sequentially through the connecting cavity 2 and the filling grid unit 3. Due to the influence of the flame-arresting filler 41, more gas will choose to pass through the gas flow channel of the cylindrical dividing unit 8, and then through the first sub-flame-arresting unit 610 to the other side of the first sub-flame-arresting unit 610, and then into the downstream device or pipeline. Another portion of the gas will pass through the flame-arresting filler 41 and the second sub-flame-arresting unit 620 to the other side of the second sub-flame-arresting unit 620, and then into the downstream device or pipeline. The presence of the flame-arresting filler 41 results in better flow equalization of the gas entering the main cavity 7 from upstream, fully utilizing the area with smaller pressure drop on the first sub-flame-arresting unit 610 side, thus achieving a smaller pressure drop. This is highly beneficial for improving the flow performance of the detonation-type flame arrester 300.

[0096] Under flame arrestor conditions, after the combustible gas is ignited in the pipeline, the detonation flame sequentially passes through the connecting cavity 2, the filling grid unit 3, and the flame arrestor filler 41. Firstly, because the flame arrestor filler 41 has a certain volume, it reduces the amount of combustible gas in the main cavity 7. Simultaneously, the combustible gas is divided into multiple small spaces by the flame arrestor filler 41, thus reducing the explosive force of the detonation flame upon reaching these spaces. Secondly, because the flame arrestor filler 41 has a large specific surface area, it can further absorb the heat of the detonation flame. Thirdly, under the impact of the detonation flame, the structure of the flame arrestor filler 41 deforms, further absorbing the energy of the detonation shock wave. Therefore, the detonation flame can be significantly attenuated under the action of the filling grid unit 3 and the flame arrestor filler 41. The attenuated flame reaches the second sub-flame arrestor unit 620, where the heat transfer effect and wall effect of the second sub-flame arrestor unit 620 achieve flame arrest. In addition, the flame passing through the cylindrical partition unit 8 is also attenuated to a certain extent, and thus flame arrest is achieved through the first sub-flame arresting unit 61.

[0097] The detonation-type flame arrester 100 of the present invention reduces the amount of combustible gas in the main cavity 7 by providing flame-arresting filler 4 within the main cavity 7, and simultaneously achieves spatial segmentation of the combustible gas, making it difficult for the flame to form a large-scale propagation connection, thus significantly reducing the combustion and explosion power of the detonation flame. Furthermore, the flame-arresting filler 4 has a large specific surface area, which can effectively absorb the heat of the detonation flame. Simultaneously, the structure of the flame-arresting filler 4 deforms under the impact of the detonation flame, which can effectively absorb the energy of the detonation shock wave, enhance the active absorption capacity of the detonation shock wave, and thus reduce the destructive power of the detonation impact. These factors allow the detonation flame to be effectively attenuated, and the attenuated flame further passes through the flame-arresting unit 6, where the heat transfer effect and wall effect of the flame-arresting unit 6 achieve flame arrest. Therefore, by achieving active attenuation of the shock wave and spatial segmentation of combustible gas through the flame-arresting filler 6, the flame-arresting performance and flow performance of the detonation-type flame arrester are greatly enhanced.

[0098] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0099] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0100] Furthermore, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A detonation-type flame arrester, comprising: A cylindrical main cavity (7) is provided at both ends of the main cavity, and a connecting cavity (2) is provided at each end of the main cavity. The diameter of the connecting cavity is smaller than the diameter of the main cavity. The two ends of the main cavity are provided with connecting parts for connecting the connecting cavities. The diameter of the connecting parts is set to decrease from the end of the main cavity outward along the axial direction. A flame arresting unit (6) is disposed in the main cavity and located in the axial center. The flame arresting unit is configured to include a first sub-flame arresting unit (61) in an annular shape and a second sub-flame arresting unit (62) arranged in the center of the first sub-flame arresting unit. A symmetrically arranged grid-filled unit (3) is fixedly connected to the main cavity on both sides of the flame arresting unit. The grid-filled unit is fixed to the inner wall of the connecting part and located at one end close to the connecting cavity. A cylindrical partition unit (8) is provided between the grid-filled unit and the second sub-flame arresting unit on the axial direction. The side wall of the cylindrical partition unit is provided with a gas flow channel. The gas flow channel is constructed as a strip-shaped through groove (82) extending axially or an annular through groove (83) extending circumferentially. The thickness of the first sub-flame arresting unit is less than the thickness of the second sub-flame arresting unit, and the gap values ​​of the first sub-flame arresting unit and the second sub-flame arresting unit are the same. Fire-resistant filler (4) is filled between the fire-resistant unit and the filler grid unit, and the fire-resistant filler is filled inside the cylindrical partition unit; The filling grid unit and the flame-arresting filler can divert the gas under normal operating conditions, allowing the gas to pass through the flame-arresting unit at a predetermined flow rate. They can also absorb the heat of the detonation flame and the energy of the detonation shock wave under flame-arresting conditions, thereby attenuating the detonation flame and preventing the flame from passing through the flame-arresting unit.

2. The detonation-type flame arrester according to claim 1, characterized in that, The predetermined circulation volume is at 60%. Within 100% of the design flow range.

3. The detonation-type flame arrester according to claim 1, characterized in that, The flow area S3 of the filling grid unit is greater than the flow area S2 of the connecting cavity.

4. The detonation-type flame arrester according to any one of claims 1 to 3, characterized in that, The porosity of the fire-retardant filler is greater than 0.

6.

5. The detonation-type flame arrester according to any one of claims 1 to 3, characterized in that, Support units (5) are provided on both sides of the flame arrester unit and are fixedly connected to the inner wall of the main cavity, for fixing the flame arrester unit.

6. The detonation-type flame arrester according to claim 5, characterized in that, The flame arrestor unit is constructed in the shape of a disc of uniform thickness.

7. The detonation-type flame arrester according to any one of claims 1 to 3, characterized in that, The diameter of the inner axial end of the cylindrical partition unit is not less than the diameter of the outer axial end.

8. The detonation-type flame arrester according to any one of claims 1 to 3, characterized in that, The thickness of the first sub-fire arresting unit is equal to the thickness of the second sub-fire arresting unit, and the gap value of the first sub-fire arresting unit is greater than the gap value of the second sub-fire arresting unit.

9. The detonation-type flame arrester according to any one of claims 1 to 3, characterized in that, The fire-retardant filler is coated with a fire-retardant coating or a microwave-absorbing coating.

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