Dry-type flame arrester for oxyhydrogen gas combustion

Abstract

The utility model relates to the technical field of flame arresters, in particular to a dry-type flame arrester for oxyhydrogen combustion, which comprises a shell and a flame arresting core arranged in the shell, and an air inlet and an air outlet are respectively arranged at two ends of the shell. The fire-retardant core is a stainless steel powder sintering body, the inner cavity of the shell is divided into a combustible area and a safe area by the fire-retardant core, the combustible area is communicated with the air outlet, the safe area is communicated with the air inlet, and the pore of the fire-retardant core is 0.5-50 [mu] m. The flame arresting core of the flame arrester is obtained by sintering stainless steel powder, smaller and uniform-size pores can be obtained, and the flame arresting requirement during oxyhydrogen gas combustion is met; meanwhile, the strength of the stainless steel sintered body is high, the stability of the structure can be ensured even if the stainless steel sintered body is subjected to large pressure impact, and explosion resistance is better achieved; in addition, the stainless steel sintered body is more resistant to high temperature and corrosion; therefore, the safety valve has the advantages of being high in safety and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to combustion safety technical field especially relates to a kind of dry fire arrestor for hydrogen-oxygen gas combustion. BACKGROUND

[0002] In the existing industrial heating furnace, the fuel used is mostly fossil fuel, which pollutes the environment and will be gradually replaced by clean fuel. Hydrogen in clean fuel has the characteristics of clean and environmental protection, zero pollution emission, high combustion heat value and high energy density, and is suitable for use as industrial fuel alone or mixed with other fuels.

[0003] In industrial heating furnaces, a filler dry fire arrestor is usually installed in the fuel pipeline for safety reasons. However, in the scenario of hydrogen-oxygen gas fuel supply, the traditional filler dry fire arrestor cannot meet the fire arrestment requirements. The required fire arrestment diameter of hydrogen is small, and the gaps in the filler (such as gravel and ceramic rings) are not uniformly distributed, which can easily form large local pores and cause flame penetration, resulting in high fire arrestment failure rate. Additionally, the pressure of hydrogen-oxygen gas flash explosion is high, and the loose structure of the filler dry fire arrestor may deform and fail under high pressure impact. Moreover, most fillers (such as gravel and ceramic rings) have poor acid and alkali resistance, and can easily powder, crack or block pores after reaction when facing corrosive fuels, greatly reducing their service life. The above situations make it difficult for the existing filler dry fire arrestor to meet the fire arrestment requirements in the hydrogen-oxygen gas combustion supply scenario, and therefore, it is necessary to improve the existing technology to solve the above problems. SUMMARY

[0004] The utility model aims to provide a kind of dry fire arrestor for hydrogen-oxygen gas combustion, to solve the problem that the filler dry fire arrestor in the prior art is not applicable to hydrogen-oxygen gas combustion supply scenario.

[0005] To achieve the above purpose, the utility model provides a kind of dry fire arrestor for hydrogen-oxygen gas combustion, which includes a shell and a fire arrestment core arranged in the shell. The shell has an air inlet and an air outlet at both ends. The fire arrestment core is a sintered body of stainless steel powder. The inner cavity of the shell is divided into a combustible area and a safety area by the fire arrestment core. The combustible area is connected to the air outlet, and the safety area is connected to the air inlet. The pore size of the fire arrestment core is between 0.5 μm and 50 μm.

[0006] Further, the fire arrestment core is a finger sleeve structure with one open end. The two end faces of the inner cavity of the shell are an air inlet end face with an air inlet and an air outlet end face with an air outlet. The fire arrestment core covers the air inlet and forms a safety area with the air inlet end face.

[0007] Further, the fire resistance core comprises two layers of fire resistance layers, the outer layer of fire resistance layer has a pore size of 5-50 microns and a wall thickness of 2-6 mm, and the inner layer of fire resistance layer has a pore size of 0.5-5 microns and a wall thickness of 1-4 mm.

[0008] Further, the outer layer of fire resistance layer is a sintered body of conventional 316L stainless steel powder, and the inner layer of fire resistance layer is a sintered body of nano 316L stainless steel powder.

[0009] Further, the outer layer of fire resistance layer is welded to the inner layer of fire resistance layer.

[0010] Further, the end surface of the fire resistance core facing the gas outlet is a hemispherical surface.

[0011] Further, the shell comprises a gas inlet side shell and a gas outlet side shell, the gas inlet is arranged on the gas inlet side shell, the gas outlet is arranged on the gas outlet side shell, the gas inlet side shell is detachably connected to the gas outlet side shell, and a first sealing ring is arranged at the connection position, and the fire resistance core is detachably arranged in the gas inlet side shell.

[0012] Further, the bottom of the fire resistance core is provided with an outwardly extending ring, the gas outlet side shell is provided with external threads, the gas inlet side shell is provided with internal threads, the external threads are screwed to the internal threads so that part of the gas outlet side shell extends into the gas inlet side shell, and the outwardly extending ring is compressed between the end of the gas outlet side shell and the gas inlet end surface.

[0013] Further, a second sealing ring is arranged between the end of the gas outlet side shell and the outwardly extending ring, and a second sealing ring is arranged between the outwardly extending ring and the gas inlet end surface.

[0014] Further, the second sealing ring is a fluorine rubber sealing ring.

[0015] Compared with the prior art, the fire resistance core of the dry fire arrester for hydrogen-oxygen gas combustion is obtained by sintering stainless steel powder, the particle size and sintering process of the selected stainless steel powder are controlled to obtain smaller and uniform pores, and the fire resistance requirement during hydrogen-oxygen gas combustion is met; at the same time, the strength of the stainless steel sintered body is high, the stability of the structure can be ensured even when facing a larger pressure impact, and the stainless steel sintered body is more resistant to explosion; in addition, the stainless steel sintered body is more resistant to high temperature and more resistant to corrosion, and can exist stably for a long time when facing corrosive fuel, and has strong applicability; the above advantages make the dry fire arrester suitable for the fire resistance requirement during hydrogen-oxygen gas combustion, and has the advantages of high safety and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a perspective view of the utility model;

[0017] Fig. 2 is an exploded view of the utility model;

[0018] Fig. 3 is a sectional view of the present application;

[0019] Fig. 4 is an exploded view of the fire barrier core.

[0020] Reference signs:

[0021] 1, housing; 11, air inlet; 12, air outlet; 13, combustible area; 14, safety area; 15, air inlet side shell; 16, air outlet side shell; 17, air inlet end face; 18, air outlet end face; 2, fire barrier core; 21, outer fire barrier layer; 22, inner fire barrier layer; 23, hemispherical surface; 24, outwardly extending ring; 31, first sealing ring; 32, second sealing ring. DETAILED DESCRIPTION

[0022] The present application will be described in detail below in conjunction with specific embodiments.

[0023] In the present application, unless otherwise specified and limited, when terms such as "provided in", "connected", and "connected" appear, these terms should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. For the direction words appearing in the present application, in order to better describe the characteristics of the features and the relationship between the features, it should be understood that when the display direction of the present application changes, the characteristics of the features and the relationship between the features also change accordingly. Therefore, the direction words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only have a relative limiting effect.

[0024] The present application provides a dry fire barrier for hydrogen-oxygen gas combustion, as shown in Figs. 1 to 4 , which comprises a housing 1 and a fire barrier core 2 provided in the housing 1, both ends of the housing 1 are provided with an air inlet 11 and an air outlet 12, the air inlet 11 is used to communicate with a hydrogen-oxygen gas production device or a gas storage device, the air outlet 12 is used to communicate with a burner or a gas using device; the fire barrier core 2 is a sintered body of stainless steel powder, the fire barrier core 2 divides the inner cavity of the housing 1 into a combustible area 13 and a safety area 14, the combustible area 13 is communicated with the air outlet 12, the safety area 14 is communicated with the air inlet 11, the pore size of the fire barrier core 2 is 0.5-50 μm.

[0025] Based on the above structure, the fire-resistant core 2 of the dry-type flame arrester for hydrogen-oxygen gas combustion is made of stainless steel powder sintering. By controlling the particle size of the selected stainless steel powder and the sintering process, smaller and uniform-sized pores can be obtained. The pores provided in the present embodiment are 0.5-50 microns, which meets the fire-resistant requirements of hydrogen-oxygen gas combustion. At the same time, the strength of the stainless steel sintering body is high, which can ensure the stability of the structure even under a large pressure impact, and is more resistant to explosion. In addition, the stainless steel sintering body is more resistant to high temperature and corrosion, and can exist stably for a long time even in high-temperature and corrosion-resistant scenes, ensuring the fire-resistant and ventilation performance and long service life. The above advantages make the dry-type flame arrester for hydrogen-oxygen gas combustion suitable for the fire-resistant requirements of hydrogen-oxygen gas combustion, and has the advantages of high safety and long service life.

[0026] In the present embodiment, the fire-resistant core 2 is a finger sleeve structure with one side open, and the two end faces of the inner cavity of the shell 1 are respectively an air inlet end face 17 provided with an air inlet 11 and an air outlet end face 18 provided with an air outlet 12. The fire-resistant core 2 covers the air inlet 11 and forms a safety area 14 with the air inlet end face 17. The middle of the fire-resistant core 2 is hollow in the finger sleeve structure, and the side walls around the hollow structure can ventilate. Compared with the pure solid columnar structure, the effective ventilation area of the finger sleeve structure is larger, so that the ventilation amount of hydrogen-oxygen gas is larger. Of course, the fire-resistant core 2 of the stainless steel powder sintering body with a pure solid columnar structure should also fall within the protection scope of the utility model.

[0027] In the present embodiment, the fire-resistant core 2 includes two layers of fire-resistant layers, the outer fire-resistant layer 21 has pores of 5-50 microns and a wall thickness of 2-6 mm, and the inner fire-resistant layer 22 has pores of 0.5-5 microns and a wall thickness of 1-4 mm. Preferably, the outer fire-resistant layer 21 is a conventional 316L stainless steel powder sintering body, which has low manufacturing cost but general fire-resistant performance, and the inner fire-resistant layer 22 is a nano-level 316L stainless steel powder sintering body, which has high manufacturing cost but better fire-resistant performance. Based on the above structure, by setting gradient pores, the outer fire-resistant layer 21 performs preliminary fire resistance and bears pressure impact, and the inner fire-resistant layer 22 performs secondary fire resistance. Since the pores of the inner fire-resistant layer 22 are smaller, the fire-resistant performance is better. At the same time, the heat generated during tempering is basically absorbed by the outer fire-resistant layer 21, so that the inner fire-resistant layer 22 can always maintain a lower temperature, further improving the fire-resistant performance of the inner fire-resistant layer 22. Moreover, the manufacturing method of using conventional 316L stainless steel powder sintering for the outer fire-resistant layer 21 and nano-level 316L stainless steel powder sintering for the inner fire-resistant layer 22 can better balance the relationship between fire-resistant performance and production cost, and reduce production cost under the condition of meeting the use requirements.

[0028] In the embodiment, the outer fire-resistant layer 21 and the inner fire-resistant layer 22 are welded together. Preferably, the outer fire-resistant layer 21 and the inner fire-resistant layer 22 are diffusion welded to achieve metallurgical bonding.

[0029] In the embodiment, the end surface of the fire-resistant core 2 facing the outlet 12 is a hemispherical surface 23. The end surface of the fire-resistant core 2 facing the outlet 12 is the main pressure-bearing surface. Compared with the case where the end surface is a flat surface, the hemispherical surface 23 can better withstand the pressure impact. The fire-resistant core 2 can disperse the impact force to the surrounding by means of the hemispherical surface structure, thereby reducing the possibility that the end surface of the fire-resistant core 2 facing the outlet 12 is broken by the impact.

[0030] In the embodiment, the shell 1 includes an inlet-side shell 15 and an outlet-side shell 16. The inlet 11 is arranged on the inlet-side shell 15, and the outlet 12 is arranged on the outlet-side shell 16. The inlet-side shell 15 is detachably connected to the outlet-side shell 16, and a first sealing ring 31 is arranged at the connection. The fire-resistant core 2 is detachably mounted on the inlet-side shell 15. Based on the above structure, the fire-resistant core 2 can be detached from the shell 1, thereby facilitating the maintenance or replacement of the fire-resistant core 2. Preferably, the bottom of the fire-resistant core 2 is provided with an outwardly extending ring 24. The outlet-side shell 16 is provided with external threads, and the inlet-side shell 15 is provided with internal threads. The external threads and the internal threads are screwed together to make part of the outlet-side shell 16 extend into the inlet-side shell 15, and the outwardly extending ring 24 is compressed between the end of the outlet-side shell 16 and the inlet end surface 17. By means of the above structure, the fire-resistant core 2 is compressed between the outlet-side shell 16 and the inlet-side shell 15, thereby achieving firm installation, simple and fast disassembly, and high reliability.

[0031] In the embodiment, a second sealing ring 32 is arranged between the end of the outlet-side shell 16 and the outwardly extending ring 24, and a second sealing ring 32 is arranged between the outwardly extending ring 24 and the inlet end surface 17. The second sealing ring 32 can effectively prevent the flame from entering the safe area 14 through other gaps without passing through the fire-resistant core 2. Preferably, the second sealing ring 32 is a fluororubber sealing ring, which has higher high-temperature resistance.

[0032] In summary, the dry fire arrester for hydrogen-oxygen gas combustion can solve the problem that the filler dry fire arrester in the prior art is not suitable for hydrogen-oxygen gas combustion supply scenarios.

[0033] In the case of no conflict, the above embodiments and the features in the embodiments can be combined with each other.

[0034] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model, and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently, and does not deviate from the essence and scope of the technical scheme of the utility model.

Claims

1. A dry flame arrester for hydrogen-oxygen combustion, comprising a housing (1) and a flame arresting core (2) disposed within the housing (1), wherein an air inlet (11) and an air outlet (12) are respectively provided at both ends of the housing (1), characterized in that: The flame arrestor core (2) is a stainless steel powder sintered body. The flame arrestor core (2) divides the inner cavity of the shell (1) into a combustible area (13) and a safe area (14). The combustible area (13) is connected to the air outlet (12), and the safe area (14) is connected to the air inlet (11). The pore size of the flame arrestor core (2) is 0.5μm-50μm.

2. The dry flame arrester for hydrogen-oxygen combustion according to claim 1, characterized in that: The flame arrestor core (2) is a finger-shaped structure with a single-sided opening. The two ends of the inner cavity of the housing (1) are respectively the air inlet end face (17) with an air inlet (11) and the air outlet end face (18) with an air outlet (12). The flame arrestor core (2) covers the air inlet (11) and forms a safe area (14) with the air inlet end face (17).

3. The dry flame arrester for hydrogen-oxygen combustion according to claim 2, characterized in that: The fire-resistant core (2) includes two fire-resistant layers, an outer fire-resistant layer (21) with a pore size of 5μm-50μm and a wall thickness of 2mm-6mm, and an inner fire-resistant layer (22) with a pore size of 0.5μm-5μm and a wall thickness of 1mm-4mm.

4. The dry flame arrester for hydrogen-oxygen combustion according to claim 3, characterized in that: The outer fire-retardant layer (21) is a conventional 316L stainless steel powder sintered body, and the inner fire-retardant layer (22) is a nano-grade 316L stainless steel powder sintered body.

5. The dry flame arrester for hydrogen-oxygen combustion according to claim 4, characterized in that: The outer fire-retardant layer (21) and the inner fire-retardant layer (22) are welded together.

6. The dry flame arrester for hydrogen-oxygen combustion according to claim 2, characterized in that: The end face of the flame arrester core (2) facing the air outlet (12) is a hemispherical surface (23).

7. The dry flame arrester for hydrogen-oxygen combustion according to any one of claims 2 to 6, characterized in that: The housing (1) includes an air inlet side housing (15) and an air outlet side housing (16). An air inlet (11) is provided on the air inlet side housing (15), and an air outlet (12) is provided on the air outlet side housing (16). The air inlet side housing (15) and the air outlet side housing (16) are detachably connected and a first sealing ring (31) is provided at the connection. The flame arrester core (2) is detachably installed on the air inlet side housing (15).

8. The dry flame arrester for hydrogen-oxygen combustion according to claim 7, characterized in that: The bottom of the flame arrester core (2) is provided with an extension ring (24), the outlet side housing (16) is provided with an external thread, and the inlet side housing (15) is provided with an internal thread. The external thread and the internal thread are screwed together so that part of the outlet side housing (16) extends into the inlet side housing (15). The extension ring (24) is pressed between the end of the outlet side housing (16) and the inlet end face (17).

9. The dry flame arrester for hydrogen-oxygen combustion according to claim 8, characterized in that: A second sealing ring (32) is provided between the end of the air outlet side housing (16) and the outer ring (24), and a second sealing ring (32) is provided between the outer ring (24) and the air inlet end face (17).

10. The dry flame arrester for hydrogen-oxygen combustion according to claim 9, characterized in that: The second sealing ring (32) is a fluororubber sealing ring.

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