Anti-backfire gas supply system for oxyhydrogen gas combustion

Abstract

The invention relates to the technical field of combustion safety, in particular to an anti-backfire gas supply system for oxyhydrogen gas combustion, which comprises a hydrogen production machine, a burner, a pipeline for communicating the hydrogen production machine with the burner, an electromagnetic valve, a dry-type flame arrester, a flame probe and a controller, an electromagnetic valve, a dry-type flame arrester and a flame probe are sequentially arranged on a pipeline for communicating the hydrogen production machine with the burner, the electromagnetic valve is used for controlling the on-off of the pipeline, the dry-type flame arrester is arranged in the pipeline to arrest fire, and the flame probe is connected to the pipeline in a bypass mode to detect flame in the pipeline; the flame probe is in communication connection with the controller; the electromagnetic valve and the hydrogen production machine are controlled by the controller; when the flame probe detects that flame appears in the pipeline, the controller controls the hydrogen production machine to stop hydrogen production and controls the electromagnetic valve to be closed. The anti-backfire gas supply system for oxyhydrogen gas combustion is high in safety.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion safety, and particularly to an anti-backfire gas supply system for hydrogen-oxygen combustion. Background Art

[0002] In existing industrial heating furnaces, most of the fuels used are fossil fuels, which cause great pollution and will gradually be replaced by clean fuels. Hydrogen in clean fuels has the characteristics of being clean and environmentally friendly, having zero pollution emissions, high combustion calorific value, and large energy density, and will gradually replace traditional fossil fuels.

[0003] Currently, there is a hydrogen-oxygen fuel supply system in the kiln industry. It generates hydrogen and oxygen by hydrolyzing water, and then mixes hydrogen and oxygen with other fuels and transports them to the burner. Among them, hydrogen and oxygen are transported through the same pipeline after being electrolyzed. However, hydrogen-oxygen gas has the characteristics of fast combustion speed and easy flash explosion. If backfire occurs during gas supply and cannot be contained in time, the consequences will be very serious. But currently, the general anti-backfire measures only set flame arresters in the pipeline. First, the existing flame arresters have poor fire arrest effect when facing the backfire of hydrogen-oxygen gas; second, when the frequency of backfire is high and the interval time is short, the flame arrester is continuously impacted by backfire, and the temperature of the flame arrester rises rapidly. When the temperature of the flame arrester rises to a certain level, the fire arrest fails and the safety is reduced; third, the existing flame arresters are more likely to be structurally damaged when facing the flash explosion impact of hydrogen-oxygen gas, which greatly increases the frequency of maintenance or replacement of the flame arrester. The above makes the hydrogen-oxygen gas supply system of the existing technology have low safety.

[0004] Therefore, it is necessary to improve the existing technology to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-backfire gas supply system for hydrogen-oxygen combustion, aiming to solve the problem of low safety of the hydrogen-oxygen gas supply system in the existing technology.

[0006] To achieve the above purpose, the present invention provides an anti-backfire gas supply system for hydrogen-oxygen combustion, including a hydrogen generator, a burner, and a pipeline for connecting the hydrogen generator and the burner. It also includes an electromagnetic valve, a dry-type flame arrester, a flame detector, and a controller; the electromagnetic valve, the dry-type flame arrester, and the flame detector are sequentially arranged on the pipeline connecting the hydrogen generator and the burner. The electromagnetic valve is used to control the on-off of the pipeline. The dry-type flame arrester is arranged in the pipeline to arrest fire. The flame detector is connected beside the pipeline to detect the firelight in the pipeline; the flame detector is communicatively connected with the controller, and both the electromagnetic valve and the hydrogen generator are controlled by the controller; when the flame detector detects the appearance of firelight in the pipeline, the controller controls the hydrogen generator to stop hydrogen production and controls the electromagnetic valve to close.

[0007] Furthermore, the gas supply system further includes a cooling device for cooling the dry flame arrester. The cooling device is controlled by a controller. After the flame detector detects a fire in the pipeline, the controller controls the cooling device to start to cool the dry flame arrester.

[0008] Furthermore, after the flame detector detects a fire in the pipeline, the controller controls the hydrogen generator to stop hydrogen production and controls the solenoid valve to close within time T1. After time T2 or when the temperature of the dry flame arrester drops below temperature C, the controller controls the hydrogen generator to start hydrogen production and controls the solenoid valve to open; where time T1 is 0.01 s to 0.05 s, time T2 is 30 s to 60 s, and temperature C is 80 °C to 120 °C.

[0009] Furthermore, the flame detector includes a sleeve, a light sensor probe, a light-transmitting glass, a reflecting concave mirror, a pressing sleeve, and a pressing cover; the reflecting concave mirror is arranged inside the sleeve, the pressing cover is threadedly connected to the sleeve, the pressing cover is provided with a first through hole, the reflecting concave mirror is provided with a second through hole and a reflecting cavity, the light sensor probe passes through the first through hole and the second through hole in sequence and enters the reflecting cavity and then is locked on the pressing cover, and the light-sensitive point of the light sensor probe is located at the focus of the reflecting concave mirror; the light-transmitting glass is arranged inside the sleeve, the pressing sleeve is threadedly connected to the inside of the sleeve and can press the light-transmitting glass inside the sleeve, and external light can pass through the through hole of the pressing sleeve and the light-transmitting glass in sequence and then reach the reflecting concave mirror and be focused by the reflecting concave mirror to its focus.

[0010] Furthermore, the sleeve is provided with a first-diameter inner cavity, a second-diameter inner cavity, and a third-diameter inner cavity. The diameter of the first-diameter inner cavity is larger than that of the second-diameter inner cavity, and a stepped surface is formed between the first-diameter inner cavity and the second-diameter inner cavity, and the reflecting concave mirror abuts against the stepped surface; the diameter of the third-diameter inner cavity is larger than that of the second-diameter inner cavity, and a transition slope is provided between the second-diameter inner cavity and the third-diameter inner cavity. The top diameter of the light-transmitting glass is smaller than the bottom diameter so that the light-transmitting glass forms a mating slope that fits with the transition slope, and the mating slope is installed on the transition slope; the pressing sleeve is threadedly connected to the third-diameter inner cavity and abuts against the light-transmitting glass.

[0011] Furthermore, a first pressing washer is arranged between the light-transmitting glass and the pressing sleeve; a second pressing washer is arranged between the pressing cover and the reflecting concave mirror; the pressing cover is provided with a locking clip, a locking sleeve is sleeved outside the light sensor probe, and the locking sleeve is threadedly connected to the locking clip so that the light sensor probe is clamped by the pressing cover; the sleeve is provided with a connecting section, and the connecting section is arranged at one end close to the pressing sleeve and is provided with an external thread.

[0012] Further, the dry flame arrester includes a housing and a flame arrestor core disposed within the housing. An air inlet and an air outlet are respectively provided at both ends of the housing; the flame arrestor core is a sintered stainless steel powder body, which divides the inner cavity of the housing into a combustible region and a flame-free region. The combustible region is in communication with the air outlet, and the flame-free region is in communication with the air inlet. The pores of the flame arrestor core are 0.5 μm - 50 μm.

[0013] Further, the flame arrestor core is a finger sleeve-like structure with a single-sided opening. The two end faces of the inner cavity of the housing are respectively an air inlet end face provided with an air inlet and an air outlet end face provided with an air outlet. The flame arrestor core covers the air inlet and forms a flame-free region between it and the air inlet end face. The end face of the flame arrestor core facing the air outlet is a hemispherical surface; the flame arrestor core includes an outer and an inner flame arrestor layer. The pores of the outer flame arrestor layer are 5 μm - 50 μm and the wall thickness is 2 mm - 6 mm, and the pores of the inner flame arrestor layer are 0.5 μm - 5 μm and the wall thickness is 1 mm - 4 mm; the outer flame arrestor layer is a conventional sintered 316L stainless steel powder body, and the inner flame arrestor layer is a nano-level sintered 316L stainless steel powder body. The housing is made of 316L stainless steel.

[0014] Further, the housing includes an air inlet side housing and an air outlet side housing. The air inlet is provided on the air inlet side housing, and the air outlet is provided on the air outlet side housing. The air inlet side housing and the air outlet side housing are detachably connected, and a first sealing ring is provided at the connection; an extension ring is provided at the bottom of the flame arrestor core. The air outlet side housing is provided with an external thread, and the air inlet side housing is provided with an internal thread. The external thread is screwed with the internal thread so that a part of the air outlet side housing extends into the air inlet side housing, and the extension ring is pressed between the end of the air outlet side housing and the air inlet end face; a second sealing ring is provided between the end of the air outlet side housing and the extension ring, and a second sealing ring is provided between the extension ring and the air inlet end face.

[0015] Further, the outside of the air inlet side housing is wrapped with a cooling housing, and a cooling cavity is formed between the cooling housing and the air inlet side housing. The cooling housing is provided with a liquid inlet and a liquid outlet communicating with the cooling cavity; the cooling device is respectively communicated with the liquid inlet and the liquid outlet through a liquid delivery pipe. A coolant capable of circulating is filled in the cooling device, the cooling cavity and the liquid delivery pipe, and the cooling device is controlled by a controller.

[0016] A backfire-proof gas supply system for hydrogen-oxygen combustion provided by the present invention, compared with the prior art, sets a dry flame arrester for basic flame arrest in the pipeline. When the flame detector detects a fire in the pipeline, the controller controls the hydrogen generator to stop hydrogen production and controls the solenoid valve to close. After both the gas supply source and the solenoid valve in the control pipeline are closed, first, the safety of the hydrogen generator and the pipeline can be ensured, and second, enough time can be given to the dry flame arrester to cool down and restore its flame arrest function, making the safety of this gas supply system high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is the structural schematic diagram of the present invention;

[0018] Figure 2 It is the three-dimensional structure diagram of the flame detector;

[0019] Figure 3 It is the sectional view of the flame detector;

[0020] Figure 4 It is Figure 3 The partial enlarged view at position A in

[0021] Figure 5 It is the three-dimensional structure diagram of the dry flame arrester;

[0022] Figure 6 It is the exploded structure diagram of the dry flame arrester;

[0023] Figure 7 It is the sectional view of the dry flame arrester;

[0024] Figure 8 It is the exploded structure diagram of the flame arrestor core.

[0025] Explanation of reference numerals:

[0026] 11, hydrogen generator; 12, burner; 13, pipeline;

[0027] 2, solenoid valve;

[0028] 3, dry flame arrester; 31, housing; 311, intake port; 312, outlet port; 313, combustible area; 314, flame-free area; 315, intake-side outer shell; 316, outlet-side outer shell; 317, intake end face; 318, outlet end face; 32, flame arrestor core; 321, outer flame arrestor layer; 322, inner flame arrestor layer; 323, hemispherical surface; 324, extension ring; 331, first sealing ring; 332, second sealing ring; 34, cooling shell; 341, cooling cavity; 342, liquid inlet; 343, liquid outlet;

[0029] 4, flame detector; 41, sleeve; 411, first-diameter inner cavity; 412, second-diameter inner cavity; 413, third-diameter inner cavity; 414, stepped surface; 415, transitional inclined surface; 42, light sensor; 43, light-transmitting glass; 431, mating inclined surface; 44, reflecting concave mirror; 45, compression sleeve; 46, compression cover; 47, first compression washer; 48, second compression washer; 49, locking clip;

[0030] 5, controller;

[0031] 6, cooling device; 61, infusion pipe. Specific embodiments

[0032] The present invention will be described in detail below in conjunction with specific embodiments.

[0033] In the present invention, unless otherwise clearly defined and limited, when terms such as "arranged on", "connected", "linked" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. For the direction words in the present invention, they are used to better explain the characteristics of the features and the relationships between the features. It should be understood that when the placement direction of the present invention changes, the direction of the characteristics of the features and the relationships between the features also changes accordingly. Therefore, the direction words do not constitute an absolute limitation on the characteristics of the features and the relationships between the features in space, but only play a relative limiting role.

[0034] This embodiment provides an anti-backfire gas supply system for hydrogen-oxygen combustion, as Figures 1 to 8 shown, which includes a hydrogen generator 11, a burner 12, and a pipeline 13 for connecting the hydrogen generator 11 and the burner 12. It also includes a solenoid valve 2, a dry flame arrester 3, a flame detector 4, and a controller 5; the solenoid valve 2, the dry flame arrester 3, and the flame detector 4 are sequentially arranged on the pipeline 13 connecting the hydrogen generator 11 and the burner 12. The solenoid valve 2 is used to control the on-off of the pipeline 13. The dry flame arrester 3 is arranged in the pipeline 13 to prevent fire. The flame detector 4 is connected beside the pipeline 13 to detect the firelight in the pipeline 13; the flame detector 4 is communicatively connected to the controller 5, and both the solenoid valve 2 and the hydrogen generator 11 are controlled by the controller 5; when the flame detector 4 detects the appearance of firelight in the pipeline 13, the controller 5 controls the hydrogen generator 11 to stop hydrogen production and controls the solenoid valve 2 to close.

[0035] Based on the above structural settings, this anti-backfire gas supply system for hydrogen-oxygen combustion is provided with a dry flame arrester 3 for basic fire prevention in the pipeline 13. When the flame detector 4 detects the appearance of firelight in the pipeline 13, the controller 5 controls the hydrogen generator 11 to stop hydrogen production and controls the solenoid valve 2 to close. After both the gas supply source and the solenoid valve 2 controlling the pipeline 13 are closed, first, the safety of the hydrogen generator 11 and the pipeline 13 can be ensured. Second, enough time can be given to the dry flame arrester 3 to cool down and restore its fire prevention function, making this gas supply system highly safe.

[0036] In this embodiment, the gas supply system further includes a cooling device 6, which is used to cool down the dry flame arrester 3. The cooling device 6 is controlled by a controller 5. After the flame detector 4 detects a flame in the pipeline 13, the controller 5 controls the cooling device 6 to start to cool down the dry flame arrester 3. Preferably, after the flame detector 4 detects a flame in the pipeline 13, the controller 5 controls the hydrogen generator 11 to stop hydrogen production and the solenoid valve 2 to close within the time T1. After the time T2 or when the temperature of the dry flame arrester 3 drops below the temperature C, the controller 5 controls the hydrogen generator 11 to start hydrogen production and the solenoid valve 2 to open; where the time T1 is 0.01 s to 0.05 s, the time T2 is 30 s to 60 s, and the temperature C is 80 °C to 120 °C. Based on the above settings, preferably, 0.01 s after the flame detector 4 detects a flame in the pipeline 13, the controller 5 controls the hydrogen generator 11 to stop hydrogen production and the solenoid valve 2 to close. After 60 s or when the temperature of the dry flame arrester 3 drops below 100 °C, the controller 5 controls the hydrogen generator 11 to start hydrogen production and the solenoid valve 2 to open, and the gas supply system restarts.

[0037] In this embodiment, the flame detector 4 includes a sleeve 41, a light sensor 42, a light-transmitting glass 43, a reflecting concave mirror 44, a compression sleeve 45, and a compression cover 46; the reflecting concave mirror 44 is arranged inside the sleeve 41, the compression cover 46 is threadedly connected to the sleeve 41, the compression cover 46 is provided with a first through hole, the reflecting concave mirror 44 is provided with a second through hole and a reflecting cavity, the light sensor 42 passes through the first through hole and the second through hole in sequence and enters the reflecting cavity and then is locked to the compression cover 46, and the light-sensing point of the light sensor 42 is located at the focal point of the reflecting concave mirror 44; the light-transmitting glass 43 is arranged inside the sleeve 41, the compression sleeve 45 is threadedly connected to the inside of the sleeve 41 and can press the light-transmitting glass 43 inside the sleeve 41, and external light can pass through the through hole of the compression sleeve 45 and the light-transmitting glass 43 in sequence and then reach the reflecting concave mirror 44 and be focused by the reflecting concave mirror 44 to its focal point.

[0038] Based on the above structural settings, when backfire occurs, the light of the flame will pass through the light-transmitting glass 43 and enter the reflecting concave mirror 44. Through the refraction of the reflecting concave mirror 44, the light can be concentrated on the light sensor 42. Due to the focusing effect, the brightness is increased, and even a flash with a lower brightness can be detected by the light sensor 42. The light sensor 42 can accurately and quickly capture the flame flicker signal and provide a signal for the controller 5, so that the hydrogen generator 11 can be quickly controlled to stop hydrogen production and the solenoid valve 2 can be closed at the initial stage of backfire, thereby effectively preventing the spread and expansion of the fire and improving the safety index of the gas supply system. The light-transmitting glass 43 is provided to isolate the light sensor 42 from the flame in the pipeline 13, protecting the light sensor 42 while realizing the function of light transmission.

[0039] In this embodiment, the sleeve 41 is provided with a first-diameter inner cavity 411, a second-diameter inner cavity 412, and a third-diameter inner cavity 413. The diameter of the first-diameter inner cavity 411 is greater than that of the second-diameter inner cavity 412. A stepped surface 414 is formed between the first-diameter inner cavity 411 and the second-diameter inner cavity 412, and the reflecting concave mirror 44 abuts against the stepped surface 414. The reflecting concave mirror 44 can be directly adhered to the stepped surface 414 with an adhesive, or the reflecting concave mirror 44 can be pressed against the stepped surface 414 by a pressing cover 46. The diameter of the third-diameter inner cavity 413 is greater than that of the second-diameter inner cavity 412. A transition is made between the second-diameter inner cavity 412 and the third-diameter inner cavity 413 by means of a transition inclined surface 415. The top diameter of the light-transmitting glass 43 is smaller than the bottom diameter so that a mating inclined surface 431 that fits with the transition inclined surface 415 is formed on the light-transmitting glass 43, and the mating inclined surface 431 is installed on the transition inclined surface 415. The pressing sleeve 45 is threadedly connected to the third-diameter inner cavity 413 and abuts against the light-transmitting glass 43. Through the cooperation of the transition inclined surface 415 and the mating inclined surface 431, the installation of the light-transmitting glass 43 is made simpler and quicker, and it also helps to fix and support the light-transmitting glass 43, thereby improving the stability of the overall structure. Moreover, by means of the cooperation of the inclined surfaces, the sealing performance between the light-transmitting glass 43 and the pipe body can be improved. And when a backfire causes a sharp increase in the pressure in the pipeline 13, the cooperation of the inclined surfaces will make them press more tightly against each other, further increasing the sealing performance.

[0040] In this embodiment, a first pressing washer 47 is provided between the light-transmitting glass 43 and the pressing sleeve 45; a second pressing washer 48 is provided between the pressing cover 46 and the reflecting concave mirror 44. The first pressing washer 47 prevents the pressing sleeve from directly contacting the light-transmitting glass 43 and prevents the light-transmitting glass 43 from being damaged when the pressing sleeve presses the light-transmitting glass 43. When the reflecting concave mirror 44 is pressed against the stepped surface 414 by the pressing cover 46, the second pressing washer 48 prevents the pressing cover 46 from directly contacting the reflecting concave mirror 44 and prevents the reflecting concave mirror 44 from being damaged when the pressing cover 46 presses the reflecting concave mirror 44. The pressing cover 46 is provided with a locking screw clip 49. A locking sleeve is sleeved outside the light-sensing probe 42, and the locking sleeve is threadedly connected to the locking screw clip 49 so that the light-sensing probe 42 is clamped by the pressing cover 46; through the cooperation of the locking screw clip 49 and the locking sleeve, the installation of the light-sensing probe 42 is made easier and the operation is more convenient. The sleeve 41 is provided with a connecting section, and the connecting section is arranged at one end close to the pressing sleeve 45 and is provided with an external thread. The setting of the external thread makes the disassembly and assembly between the flame probe 4 and the pipeline 13 more convenient and quicker.

[0041] In this embodiment, the dry flame arrester 3 includes a housing 31 and a flame arrestor core 32 disposed inside the housing 31. An air inlet 311 and an air outlet 312 are respectively provided at two ends of the housing 31. The flame arrestor core 32 is a stainless steel powder sintered body. The flame arrestor core 32 divides the inner cavity of the housing 31 into a combustible region 313 and a flame-free region 314. The combustible region 313 communicates with the air outlet 312, and the flame-free region 314 communicates with the air inlet 311. The pores of the flame arrestor core 32 are 0.5 μm - 50 μm.

[0042] Based on the above structural arrangement, the flame arrestor core 32 is obtained by sintering stainless steel powder. By controlling the particle size of the selected stainless steel powder and the sintering process, smaller and uniformly sized pores can be obtained. The case where the pores provided in this embodiment are 0.5 μm - 50 μm meets the flame arrestment requirements during the combustion of hydrogen-oxygen gas. At the same time, the stainless steel sintered body has higher strength, and can ensure the structural stability even when facing a large pressure impact, and is more explosion-proof. Moreover, the stainless steel sintered body is more heat-resistant and more corrosion-resistant, and can ensure the ventilation and flame arrestment performance even in the face of high-temperature and corrosion-resistant scenarios, with a long service life. The above advantages make this type of dry flame arrester 3 suitable for the flame arrestment requirements during the combustion of hydrogen-oxygen gas, and has the advantages of high safety and long service life.

[0043] In this embodiment, the flame arrestor core 32 is a finger sleeve-like structure with a single-sided opening. The two end faces of the inner cavity of the housing 31 are respectively an air inlet end face 317 provided with the air inlet 311 and an air outlet end face 318 provided with the air outlet 312. The flame arrestor core 32 covers the air inlet 311 and forms the flame-free region 314 between it and the air inlet end face 317. The end face of the flame arrestor core 32 facing the air outlet 312 is a hemispherical surface 323. If a finger sleeve-like structure is adopted, the middle of the flame arrestor core 32 is a hollow structure, and the side walls around the hollow structure can all conduct air. Compared with a pure solid columnar structure, the finger sleeve-like structure has a larger effective ventilation area, enabling a larger ventilation volume of hydrogen-oxygen gas. Of course, the flame arrestor core 32 of a stainless steel powder sintered body with a pure solid columnar structure should also fall within the protection scope of the present invention. The end face of the flame arrestor core 32 facing the air outlet 312 is the main pressure-bearing surface. Compared with setting the end face as a plane, when set as a hemispherical surface 323, it can better withstand the pressure impact. The flame arrestor core 32 can disperse the impact force to the surroundings by means of the hemispherical surface 323 structure, reducing the possibility of the end face of the flame arrestor core 32 facing the air outlet 312 being impacted and broken.

[0044] The flame arrester core 32 includes an inner and an outer flame arrester layer. The pores of the outer flame arrester layer 321 are 5μm - 50μm and the wall thickness is 2mm - 6mm. The pores of the inner flame arrester layer 322 are 0.5μm - 5μm and the wall thickness is 1mm - 4mm. The outer flame arrester layer 321 is a sintered body of conventional 316L stainless steel powder, and the inner flame arrester layer 322 is a sintered body of nano-scale 316L stainless steel powder. The housing 31 is made of 316L stainless steel. Based on the above structural arrangement, by setting a gradient of pores, the outer flame arrester layer 321 conducts preliminary flame arrest and withstands pressure shocks. The outer flame arrester layer 321 is inexpensive, and the thicker it is made, the stronger its ability to withstand pressure shocks. The inner flame arrester layer 322 conducts secondary flame arrest, and because the pores of the inner flame arrester layer 322 are smaller, its flame arrest performance is better. At the same time, the heat generated during tempering is basically absorbed by the outer flame arrester layer 321, enabling the inner flame arrester layer 322 to always maintain a low temperature, further improving the flame arrest performance of the inner flame arrester layer. Moreover, the manufacturing method of using a sintered outer flame arrester layer 321 of conventional 316L stainless steel powder and a sintered inner flame arrester layer 322 of nano-scale 316L stainless steel powder can better balance the relationship between flame arrest performance and production cost, reducing production cost while meeting the usage requirements.

[0045] In this embodiment, the housing 31 includes an intake-side outer housing 315 and an exhaust-side outer housing 316. The intake port 311 is provided on the intake-side outer housing 315, and the exhaust port 312 is provided on the exhaust-side outer body 316. The intake-side outer housing 315 and the exhaust-side outer housing 316 are detachably connected, and a first sealing ring 331 is provided at the connection. The bottom of the flame arrester core 32 is provided with an extended ring 324. The exhaust-side outer housing 316 is provided with an external thread, and the intake-side outer housing 315 is provided with an internal thread. The external thread is screwed with the internal thread so that a part of the exhaust-side outer housing 316 extends into the intake-side outer housing 315, and the extended ring 324 is pressed between the end of the exhaust-side outer housing 316 and the intake end face 317. A second sealing ring 332 is provided between the end of the exhaust-side outer housing 316 and the extended ring 324, and a second sealing ring 332 is provided between the extended ring 324 and the intake end face 317. Based on the above structural arrangement, the flame arrester core 32 can be removed from the housing 31 to facilitate the inspection or replacement of the flame arrester core 32. With the above structure, the flame arrester core 32 is pressed between the exhaust-side outer housing 316 and the intake-side outer housing 315, with firm installation, simple and quick disassembly and assembly, and high reliability. The second sealing ring 332 can effectively prevent the flame from entering the flame-free area 314 through other gaps instead of passing through the flame arrester core 32. Preferably, the second sealing ring 332 is a fluororubber sealing ring, and the fluororubber sealing ring has higher high-temperature resistance.

[0046] In this embodiment, the outside of the intake side housing 315 is wrapped with a cooling housing 34. A cooling cavity 341 is formed between the cooling housing 34 and the intake side housing 315. The cooling housing 34 is provided with a liquid inlet 342 and a liquid outlet 343 that communicate with the cooling cavity 341. The cooling device 6 is respectively communicated with the liquid inlet 342 and the liquid outlet 343 by means of a liquid delivery pipe 61. A coolant that can circulate is filled in the cooling device 6, the cooling cavity 341, and the liquid delivery pipe 61. The cooling device 6 is controlled by the controller 5. Based on the above structure, the coolant can closely adhere to the intake side housing 315. After the heat of the flame arrester core 32 is transferred to the intake side housing 315, it is carried away by the coolant, so as to achieve the purpose of reducing the temperature of the flame arrester core 32. When backfire occurs, the cooling device 6 is controlled by the controller to start, and the coolant in the cooling cavity 341 flows to carry away the heat of the intake side housing 315 and reduce the temperature of the flame arrester core 32, so that the gas supply system can restart the gas supply faster.

[0047] In summary, the anti-backfire gas supply system for hydrogen-oxygen combustion has high safety.

[0048] Without conflict, the above embodiments and the features in the embodiments can be combined with each other.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A flashback-proof gas supply system for hydrogen-oxygen combustion, comprising a hydrogen generator (11), a burner (12) and a pipeline (13) for connecting the hydrogen generator (11) and the burner (12), characterized in that: It also includes a solenoid valve (2), a dry flame arrester (3), a flame probe (4) and a controller (5); A solenoid valve (2), a dry flame arrester (3) and a flame probe (4) are sequentially arranged on a pipeline (13) connecting a hydrogen generator (11) and a burner (12); the solenoid valve (2) is used to control the on / off of the pipeline (13); the dry flame arrester (3) is arranged in the pipeline (13) to prevent fire; and the flame probe (4) is connected to the pipeline (13) to detect the flame in the pipeline (13); The flame probe (4) is connected to the controller (5) for communication, and the solenoid valve (2) and the hydrogen generator (11) are both controlled by the controller (5); When the flame detector (4) detects the appearance of flame in the pipeline (13), the controller (5) controls the hydrogen generator (11) to stop hydrogen production and controls the solenoid valve (2) to close.

2. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 1, characterized in that: The gas supply system further comprises a cooling device (6) for cooling the dry flame arrester (3). The cooling device (6) is controlled by a controller (5). After the flame probe (4) detects the appearance of a flame in the pipeline (13), the controller (5) controls the cooling device (6) to start so as to cool the dry flame arrester (3).

3. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 2, characterized in that: When the flame detector (4) detects the appearance of flame in the pipeline (13), the controller (5) controls the hydrogen generator (11) to stop producing hydrogen and controls the solenoid valve (2) to close within a time T1. After a time T2 has passed or the temperature of the dry flame arrester (3) drops below a temperature C, the controller (5) controls the hydrogen generator (11) to start producing hydrogen and controls the solenoid valve (2) to open. The time T1 is 0.01s to 0.05s, the time T2 is 30s to 60s, and the temperature C is 80°C to 120°C.

4. The anti-flashback gas supply system for hydrogen and oxygen combustion according to any one of claims 1 to 3, characterized in that: The flame probe (4) comprises a sleeve (41), a light sensing probe (42), a light-transmitting glass (43), a reflecting concave mirror (44), a pressing sleeve (45) and a pressing cover (46); The reflective concave mirror (44) is arranged inside the sleeve (41), the pressing cover (46) is threadedly connected to the sleeve (41), the pressing cover (46) is provided with a first through hole, the reflective concave mirror (44) is provided with a second through hole and a reflective cavity, the light sensing probe (42) passes through the first through hole and the second through hole in sequence, enters the reflective cavity and is locked in the pressing cover (46), and the light sensing point of the light sensing probe (42) is located at the focus of the reflective concave mirror (44); the light-transmitting glass (43) is arranged inside the sleeve (41), the pressing sleeve (45) is threadedly connected to the inside of the sleeve (41) and can press the light-transmitting glass (43) inside the sleeve (41), and the external light can pass through the through hole of the pressing sleeve (45) and the light-transmitting glass (43) in sequence to reach the reflective concave mirror (44), and is focused to its focus by the reflective concave mirror (44).

5. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 4, characterized in that: The sleeve (41) is provided with a first diameter inner cavity (411), a second diameter inner cavity (412) and a third diameter inner cavity (413); the diameter of the first diameter inner cavity (411) is larger than the diameter of the second diameter inner cavity (412); the first diameter inner cavity (411) and the second diameter inner cavity (412) form a stepped surface (414); the reflective concave mirror (44) abuts against the stepped surface (414); the diameter of the third diameter inner cavity (413) is larger than the diameter of the second diameter inner cavity (412); The second diameter inner cavity (412) and the third diameter inner cavity (413) are transitioned by means of a transition slope (415); the top surface diameter of the light-transmitting glass (43) is smaller than the bottom surface diameter so that the light-transmitting glass (43) forms a matching slope (431) that matches the transition slope (415); the matching slope (431) is installed on the transition slope (415); and the pressing sleeve (45) is threadedly connected to the third diameter inner cavity (413) and abuts against the light-transmitting glass (43).

6. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 5, characterized in that: A first pressing washer (47) is arranged between the light-transmitting glass (43) and the pressing sleeve (45); a second pressing washer (48) is arranged between the pressing cover (46) and the reflecting concave mirror (44); the pressing cover (46) is provided with a locking screw clamp (49), and the outer sleeve of the light-sensing probe (42) is provided with a locking screw sleeve, which is threadedly connected to the locking screw clamp (49) so that the light-sensing probe (42) is clamped by the pressing cover (46); The sleeve (41) is provided with a connecting section, which is arranged at one end close to the pressing sleeve (45) and is provided with an external thread.

7. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 2 or 3, characterized in that: The dry flame arrester (3) comprises a shell (31) and a flame arrester core (32) arranged in the shell (31); an air inlet (311) and an air outlet (312) are respectively arranged at two ends of the shell (31); the flame arrester core (32) is a sintered body of stainless steel powder; the flame arrester core (32) divides the inner cavity of the shell (31) into a combustible area (313) and a flameless area (314); the combustible area (313) is connected to the air outlet (312), and the flameless area (314) is connected to the air inlet (311); and the pores of the flame arrester core (32) are 0.5 μm-50 μm.

8. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 5, characterized in that: The fire-blocking core (32) is a finger-shaped structure with a single-side opening. The two end surfaces of the inner cavity of the shell (31) are respectively an air inlet end surface (317) provided with an air inlet (311) and an air outlet end surface (318) provided with an air outlet (312). The fire-blocking core (32) covers the air inlet (311) and forms a flame-free area (314) between the fire-blocking core (32) and the air inlet end surface (317). The end surface of the fire-blocking core (32) facing the air outlet (312) is a hemispherical surface (323). The fire-blocking core (32) comprises two inner and outer fire-blocking layers, the outer fire-blocking layer (321) has a pore size of 5 μm-50 μm and a wall thickness of 2 mm-6 mm, and the inner fire-blocking layer (322) has a pore size of 0.5 μm-5 μm and a wall thickness of 1 mm-4 mm; The outer fire barrier layer (321) is a conventional 316L stainless steel powder sintered body, the inner fire barrier layer (322) is a nano-grade 316L stainless steel powder sintered body, and the shell (31) is made of 316L stainless steel.

9. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 5, characterized in that: The housing (31) comprises an air inlet side housing (315) and an air outlet side housing (316); the air inlet (311) is arranged on the air inlet side housing (315), the air outlet (312) is arranged on the air outlet side housing (316), the air inlet side housing (315) and the air outlet side housing (316) are detachably connected and a first sealing ring (331) is arranged at the connection; an outwardly extending ring (324) is arranged at the bottom of the fire-blocking core (32), the air outlet side housing (316) is provided with an external thread, and the air inlet side housing (315) and the air outlet side housing (316) are detachably connected and a first sealing ring (331) is arranged at the connection; the bottom of the fire-blocking core (32) is provided with an external thread; The shell (315) is provided with an internal thread, and the external thread is screwed with the internal thread so that part of the outlet side shell (316) extends into the inlet side shell (315), and the external extension ring (324) is pressed between the end of the outlet side shell (316) and the inlet end face (317); a second sealing ring (332) is provided between the end of the outlet side shell (316) and the external extension ring (324), and a second sealing ring (332) is provided between the external extension ring (324) and the inlet end face (317).

10. The anti-flashback gas supply system for hydrogen and oxygen combustion according to claim 9, characterized in that: The air intake side housing (315) is wrapped with a cooling shell (34) on the outside, a cooling cavity (341) is formed between the cooling shell (34) and the air intake side housing (315), and the cooling shell (34) is provided with a liquid inlet (342) and a liquid outlet (343) which are in communication with the cooling cavity (341); The cooling device (6) is connected to the liquid inlet (342) and the liquid outlet (343) respectively by means of a liquid infusion tube (61); the cooling device (6), the cooling cavity (341) and the liquid infusion tube (61) are filled with a cooling liquid that can circulate; and the cooling device (6) is controlled by a controller (5).

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