A large-caliber burner for experiments with uniform gas supply and high-efficiency backfire prevention

Abstract

The present invention discloses a large-diameter burner for experiments that supplies gas evenly and prevents flashback efficiently, which has multiple functions such as uniformly mixing gas, supplying gas at a constant speed, efficiently preventing flashback, and providing wake gas, and is a large-diameter burner for experiments with a compact structure. It includes a mixing chamber, a rectifying sleeve, a nozzle, a wake sleeve, a gas guide pipe, a wake gas guide pipe, legs, a flow splitting cone, a gas inlet, a wake gas inlet, a wake gas rectifying ring, a flame arrestor rectifying plate, a snap ring, and a porous medium plate. A flow splitting cone is provided at the center of the inner bottom of the mixing chamber, and legs are provided on the outer bottom surface. A gas guide pipe is installed on the side wall of the mixing chamber and is connected to the rectifying sleeve at the upper end. Inside the rectifying sleeve, a second flame arrestor rectifying plate, a second snap ring, a porous medium plate, a first snap ring, and a first flame arrestor rectifying plate are installed in sequence. The inner side of the upper end of the rectifying sleeve is connected to the nozzle, and the outer side of the upper end is connected to the wake sleeve. A wake gas rectifying ring is installed between the nozzle and the wake sleeve, and a wake gas guide pipe is installed on the side wall of the wake sleeve.

Description

Technical Field

[0001] The present invention belongs to the technical field of combustible gas combustion experiments, and particularly relates to a large-diameter burner for experiments with uniform gas supply and high-efficiency anti-flashback, which has multiple functions such as uniform mixing of gas, uniform gas supply, high-efficiency anti-flashback, and providing wake gas. Background Art

[0002] Limited oil reserves and growing environmental problems have prompted people to study clean, renewable, and low-pollution energy sources. Renewable gases such as natural gas have been widely used in industrial production and people's daily lives. With the proposal of the "dual-carbon" strategic goal, hydrogen, a clean and carbon-free renewable energy source, has great value in aspects such as energy storage and direct use as fuel. Moreover, hydrogen can utilize some existing natural gas equipment and infrastructure, and mixing with natural gas can adjust certain characteristics of the mixture to make it suitable for specific applications, which makes hydrogen-enriched natural gas have broad application prospects.

[0003] However, hydrogen has some unique dangerous characteristics, such as high diffusivity, wide flammable range, and low minimum ignition energy, which make hydrogen have a higher risk of combustion and explosion during storage and use. After hydrogen is mixed with other gases, the fuel characteristics change. Conducting research on the flame propagation characteristics of premixed gases has important theoretical and practical significance in many aspects such as the application of clean fuels and safety engineering. There are significant differences in the flame combustion and propagation characteristics of different gas premixes and different mixing ratios, and current related research is still incomplete. Therefore, conducting relevant experimental research on premixed gas combustion to provide sufficient theoretical support for the safe utilization of premixed gas has important value. In addition, for burners with large nozzle diameters, ensuring uniform air flow is crucial, and due to the flammable and explosive characteristics of hydrogen, the risk of flashback is more likely to occur when using larger-diameter nozzles. In existing combustion experiment systems, there has not yet appeared a burner that integrates functions such as uniform mixing of gas, uniform gas supply, and high-efficiency anti-flashback.

[0004] The present invention provides a large-diameter burner for experiments with uniform gas supply and high-efficiency anti-flashback, which has multiple functions such as uniform mixing of gas, uniform gas supply, high-efficiency anti-flashback, and providing wake gas, and has a compact structure, facilitating popularization and use. Summary of the Invention

[0005] The present invention overcomes the shortcomings in the prior art and provides a large-diameter burner for experiments with uniform gas supply and high-efficiency anti-flashback, which has multiple functions such as uniform mixing of gas, uniform gas supply, high-efficiency anti-flashback, and providing wake gas, and has a simple structure and is used for combustion experiments.

[0006] The technical solution of the present invention is as follows: A large-diameter burner for experiments with uniform gas supply and high-efficiency anti-backfire, including a mixing chamber, a rectifying sleeve, a nozzle, a co-flow sleeve, a gas guide pipe, a co-flow gas guide pipe, a leg, a flow splitting cone, a first gas inlet, a second gas inlet, a third gas inlet, a fourth gas inlet, a first co-flow gas inlet, a second co-flow gas inlet, a co-flow gas rectifying ring, a first flame-retardant rectifying plate, a first clamping ring, a porous medium plate, a second clamping ring and a second flame-retardant rectifying plate; A flow splitting cone is provided at the center of the inner bottom of the mixing chamber, and legs are provided on the outer bottom surface; A gas guide pipe is installed on the side wall of the mixing chamber; The outside of the gas guide pipe is a circular ring structure, provided with a first gas inlet, a second gas inlet, a third gas inlet and a fourth gas inlet, a horizontal pipe is provided along the inner diameter of the circular ring, the horizontal pipe is placed inside the mixing chamber, and a gas outlet is provided; The first gas inlet is vertical and coaxial with the second gas inlet; The third gas inlet is the first gas inlet rotated 180° around the central axis of the circular ring of the gas guide pipe and is coaxial with the fourth gas inlet; The upper end of the mixing chamber is connected to the rectifying sleeve; The second flame-retardant rectifying plate, the second clamping ring, the porous medium plate, the first clamping ring and the first flame-retardant rectifying plate are sequentially installed inside the rectifying sleeve; The first flame-retardant rectifying plate is provided with first flame-retardant rectifying holes, and the second flame-retardant rectifying plate is provided with second flame-retardant rectifying holes; The inner side of the upper end of the rectifying sleeve is connected to the nozzle, and the outer side of the upper end is connected to the co-flow sleeve; The upper half of the nozzle is cylindrical and the lower half is frustum-shaped. A co-flow gas rectifying ring is installed between the nozzle and the co-flow sleeve, and the co-flow gas rectifying ring is provided with co-flow gas rectifying holes; A co-flow gas guide pipe is installed on the side wall of the co-flow sleeve; The co-flow gas guide pipe is two coaxial circular ring structures, located on the inner and outer sides of the co-flow sleeve respectively and communicating with each other. The outer circular ring is provided with a first co-flow gas inlet and a second co-flow gas inlet, and the inner circular ring is located below the co-flow gas rectifying ring and is evenly provided with co-flow gas outlet holes.

[0007] Wherein, a reduced diameter with a thickness of 5 to 10 mm is provided at the lower end of the rectifying sleeve, and its inner diameter is 5 to 10 mm smaller than the inner diameter of the upper part of the rectifying sleeve.

[0008] Valves are provided at the first gas inlet, the second gas inlet, the third gas inlet, the fourth gas inlet, the first co-flow gas inlet and the second co-flow gas inlet.

[0009] The horizontal pipe is perpendicular to the plane determined by the central axis of the first gas inlet and the central axis of the third gas inlet.

[0010] The gas outlet is coaxial with the mixing chamber and is 1 to 2 cm above the flow splitting cone.

[0011] The upper half of the first flame-retardant rectifying hole is funnel-shaped and the lower half is cylindrical.

[0012] The wake gas outlet hole faces the wake gas fairing ring.

[0013] The connection between the rectifying sleeve and the gas guide pipe is sealed.

[0014] The connection between the wake sleeve and the wake gas guide pipe is sealed.

[0015] The advantages of the present invention compared with the prior art are as follows:

[0016] (1) It has a good gas premixing function. By controlling the opening and closing of the air inlet, 2 to 4 kinds of gases are mixed. The air flow collides at the air inlet for preliminary premixing and is fully premixed under the multiple actions of the flame arrestor rectifying plate and the porous medium plate;

[0017] (2) It has a function of supplying gas at a uniform speed. The flow splitting cone enables the air flow to be quickly dispersed in the mixing chamber. After flowing through the second flame arrestor rectifying plate and the porous medium plate, the distribution of the air flow in the rectifying sleeve is more uniform. The structure of the first flame arrestor rectifying hole can ensure that the air flow velocity at the outlet section is equal;

[0018] (3) It has an efficient anti-backfire function. The multiple flame arrestor effects of the first flame arrestor rectifying plate, the porous medium plate and the second flame arrestor rectifying plate can effectively prevent the risk of backfire;

[0019] (4) The nozzle diameter can be flexibly adjusted to form a uniform wake gas;

[0020] (5) The structure is simple and compact, which is convenient for processing and use and saves space. Description of the Drawings

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a large-diameter burner for experiments with uniform gas supply and high-efficiency anti-backfire according to the present invention;

[0022] Figure 2 It is a schematic structure diagram of the wake gas guide pipe according to the present invention;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of the rectifying sleeve according to the present invention;

[0024] Figure 4 It is a schematic structure diagram of the gas guide pipe according to the present invention;

[0025] Figure 5 It is a schematic cross-sectional structure diagram of the first flame arrestor rectifying plate according to the present invention;

[0026] Figure 6 It is a schematic cross-sectional structure diagram of the second flame arrestor rectifying plate according to the present invention;

[0027] Figure 7 It is a schematic cross-sectional structure diagram of the wake gas fairing ring according to the present invention.

[0028] In the figure: 1 - mixing chamber, 2 - rectifying sleeve, 3 - nozzle, 4 - wake sleeve, 5 - gas guide pipe, 6 - wake gas guide pipe, 7 - leg, 8 - flow splitter cone, 9 - first gas inlet, 10 - second gas inlet, 11 - third gas inlet, 12 - fourth gas inlet, 13 - first wake gas inlet, 14 - second wake gas inlet, 15 - wake gas outlet hole, 16 - valve, 17 - wake gas rectifying ring, 18 - first flame arrestor rectifying plate, 19 - first snap ring, 20 - porous medium plate, 21 - second snap ring, 22 - second flame arrestor rectifying plate, 23 - horizontal pipe, 24 - gas outlet, 25 - first flame arrestor rectifying hole, 26 - second flame arrestor rectifying hole, 27 - wake gas rectifying hole. Specific implementation manner

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners:

[0030] In Figure 1 a large - caliber burner for experiments with uniform gas supply and high - efficiency anti - flashback mainly includes a mixing chamber 1, a rectifying sleeve 2, a nozzle 3, a wake sleeve 4, a gas guide pipe 5, a wake gas guide pipe 6, legs 7, a flow splitter cone 8, a first gas inlet 9, a second gas inlet 10, a third gas inlet 11, a fourth gas inlet 12, a first wake gas inlet 13, a second wake gas inlet 14, a wake gas rectifying ring 17, a first flame arrestor rectifying plate 18, a first snap ring 19, a porous medium plate 20, a second snap ring 21, a second flame arrestor rectifying plate 22, etc.

[0031] A flow splitter cone 8 is provided at the center of the inner cavity bottom of the mixing chamber 1, and three legs 7 are provided on the outer bottom surface. The gas guide pipe 5 is installed on the side wall of the mixing chamber 1, and the connection between the rectifying sleeve 2 and the gas guide pipe 5 is sealed. The structure of the gas guide pipe 5 is as Figure 2As shown, its exterior is a circular ring structure, with a first gas inlet 9, a second gas inlet 10, a third gas inlet 11 and a fourth gas inlet 12. The first gas inlet 9 is vertical and coaxial with the second gas inlet 10. The third gas inlet 11 is the first gas inlet 9 rotated 180° around the central axis of the circular ring of the gas flow guide tube 5. The fourth gas inlet 12 is coaxial with the third gas inlet 11. It can meet the needs of four different gas entering at the same time. The first gas and the second gas are offset, and the third gas and the fourth gas are offset, so that preliminary mixing can be achieved. A transverse tube 23 is provided along the inner diameter of the circular ring structure of the gas flow guide tube 5. The transverse tube 23 is placed inside the mixing chamber 1 and is perpendicular to the plane determined by the central axis of the first gas inlet 9 and the central axis of the third gas inlet 11. The airflow is offset at both ends of the transverse tube and mixed again. A gas outlet 24 is provided in the middle of the transverse pipe 23, and the gas outlet 24 is coaxial with the mixing chamber 1 and is located 1 to 2 cm above the diverter cone 8. After being ejected from the gas outlet 24, the gas hits the diverter cone 8 and spreads in the mixing chamber 1 more quickly and evenly.

[0032] The upper end of the mixing chamber 1 is connected to the rectifying sleeve 2, and the rectifying sleeve 2 has a structure as shown in FIG. Figure 3 As shown, the lower end is provided with a 5 to 10 mm thick variable diameter, whose inner diameter is 5 to 10 mm smaller than the inner diameter of the upper part of the fairing sleeve 2, and is used to support the second flame-blocking rectifier plate 22. The second flame-blocking rectifier plate 22, the second clamping ring 21, the porous medium plate 20, the first clamping ring 19 and the first flame-blocking rectifier plate 18 are installed in the fairing sleeve 2 from bottom to top. The first flame-blocking rectifier plate 18 is as shown in FIG. Figure 5 As shown, the surface is evenly provided with first flame-blocking rectifying holes 25, the upper part of which is funnel-shaped and the lower part is cylindrical. The funnel-shaped structure can effectively increase the gas outlet area and make the airflow more uniform. The lower cylindrical structure can shrink the flame, enhance heat exchange, and accelerate the flame extinguishing when flashback occurs, thus playing a role in flame blocking. The porous medium plate 20 is made of high-temperature resistant porous foam metal material with a pore size of 1 to 3 mm, which can make the airflow mixing more uniform and play a role in preventing flashback efficiently. The structure of the second flame-blocking rectifying plate 22 is as shown in FIG. Figure 6 As shown, a second flame-blocking rectifying hole 26 is provided, the hole diameter is 2 to 3 mm, and the hole spacing is 3 to 4 mm, which has a pressurizing effect on the airflow, making its spatial distribution more uniform, and the slender second flame-blocking rectifying hole 26 also plays a third flame-blocking role. The first flame-blocking rectifying plate 18, the porous medium plate 20 and the second flame-blocking rectifying plate 22 are used in combination to fully mix the multi-channel gas, and the gas outlet speed is uniform and the flashback is effectively prevented.

[0033] The inner side of the upper end of the straightening sleeve 2 is connected to the nozzle 3. The upper half of the nozzle 3 is cylindrical and the lower half is truncated. The outer side of the upper end of the straightening sleeve 2 is connected to the wake sleeve 4. A wake gas straightening ring 17 is installed between the nozzle 3 and the wake sleeve 4.Figure 7 As shown, there is a wake gas rectifying hole 27 with a hole diameter of 2 to 4 mm and a hole pitch of 1 mm, which has the function of uniform wake gas. The side wall of the wake sleeve 4 is installed with Figure 4 the wake gas guide pipe 6 as shown. The connection between the wake sleeve 4 and the wake gas guide pipe 6 is sealed. The wake gas guide pipe 6 is composed of two coaxial ring structures, which are respectively located on the inner and outer sides of the wake sleeve 4 and communicate with each other. The outer ring is provided with a first wake gas inlet 13 and a second wake gas inlet 14. The inner ring is located below the wake gas rectifying ring 17 and is evenly provided with wake gas outlet holes 15, and the wake gas outlet holes 15 face the wake gas rectifying ring 17.

[0034] Valves 16 are provided at the first fuel gas inlet 9, the second fuel gas inlet 10, the third fuel gas inlet 11, the fourth fuel gas inlet 12, the first wake gas inlet 13 and the second wake gas inlet 14. By controlling the opening and closing of the valves 16, the supply of 1 to 4 paths of fuel gas can be realized.

[0035] The parts not detailedly disclosed in the present invention belong to the well-known technologies in the art.

[0036] Although the illustrative specific embodiments of the present invention are described above for the convenience of those skilled in the art of the present technology to understand the present invention, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those ordinary skilled in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions made using the concept of the present invention are within the scope of protection.

Claims

1. A large-diameter burner for experiments with uniform gas supply and high-efficiency prevention of flashback, characterized in that: It includes a mixing chamber (1), a rectifying sleeve (2), a nozzle (3), a wake sleeve (4), a gas guide pipe (5), a wake gas guide pipe (6), a support leg (7), a flow splitting cone (8), a first gas inlet (9), a second gas inlet (10), a third gas inlet (11), a fourth gas inlet (12), a first wake gas inlet (13), a second wake gas inlet (14), a wake gas rectifying ring (17), a first flame arrestor rectifying plate (18), a first snap ring (19), a porous medium plate (20), a second snap ring (21), and a second flame arrestor rectifying plate (22); a flow splitting cone (8) is provided at the center of the inner bottom of the mixing chamber (1), and a support leg (7) is provided on the outer bottom surface; a gas guide pipe (5) is installed on the side wall of the mixing chamber (1); the outside of the gas guide pipe (5) is a circular ring structure, provided with a first gas inlet (9), a second gas inlet (10), a third gas inlet (11), and a fourth gas inlet (12), a horizontal pipe (23) is provided along the inner diameter of the circular ring, the horizontal pipe (23) is placed inside the mixing chamber (1), and a gas outlet (24) is provided; the first gas inlet (9) is vertical and coaxial with the second gas inlet (10); the third gas inlet (11) is the first gas inlet (9) rotated 180° around the central axis of the circular ring of the gas guide pipe (5) and is coaxial with the fourth gas inlet (12); the upper end of the mixing chamber (1) is connected to the rectifying sleeve (2); the second flame arrestor rectifying plate (22), the second snap ring (21), the porous medium plate (20), the first snap ring (19), and the first flame arrestor rectifying plate (18) are successively installed inside the rectifying sleeve (2); a first flame arrestor rectifying hole (25) is provided on the first flame arrestor rectifying plate (18), and a second flame arrestor rectifying hole (26) is provided on the second flame arrestor rectifying plate (22); the inner side of the upper end of the rectifying sleeve (2) is connected to the nozzle (3), and the outer side of the upper end is connected to the wake sleeve (4); the upper half of the nozzle (3) is cylindrical, and the lower half is frustum-shaped, a wake gas rectifying ring (17) is installed between the nozzle (3) and the wake sleeve (4), and a wake gas rectifying hole (27) is provided on the wake gas rectifying ring (17); a wake gas guide pipe (6) is installed on the side wall of the wake sleeve (4); the wake gas guide pipe (6) is two coaxial circular ring structures, located on the inner and outer sides of the wake sleeve (4) respectively and communicating with each other, a first wake gas inlet (13) and a second wake gas inlet (14) are provided on the outer circular ring, and the inner circular ring is located below the wake gas rectifying ring (17) and is evenly provided with wake gas outlet holes (15).

2. The large-caliber burner for experiments with uniform gas supply and high-efficiency backfire prevention according to claim 1, characterized in that: The lower end of the rectifying sleeve (2) is provided with a reduced diameter with a thickness of 5 to 10 mm, and its inner diameter is 5 to 10 mm smaller than the inner diameter of the upper part of the rectifying sleeve (2).

3. The large-caliber burner for experiments with uniform gas supply and high-efficiency flashback prevention according to claim 1, characterized in that: Valves (16) are provided at the first gas inlet (9), the second gas inlet (10), the third gas inlet (11), the fourth gas inlet (12), the first wake gas inlet (13), and the second wake gas inlet (14).

4. A large-diameter burner for experiments with uniform gas supply and high-efficiency backfire prevention according to claim 1, characterized in that: The horizontal pipe (23) is perpendicular to the plane determined by the central axes of the first gas inlet (9) and the third gas inlet (11).

5. The large-caliber burner for experiments with uniform gas supply and high-efficiency flashback prevention according to claim 1, characterized in that: The gas outlet (24) is coaxial with the mixing chamber (1) and is located 1 to 2 cm above the flow dividing cone (8).

6. The large-caliber burner for experiments with uniform gas supply and high-efficiency flashback prevention according to claim 1, characterized in that: The upper half of the first flame-retarding and rectifying hole (25) is funnel-shaped, and the lower half is cylindrical.

7. An experimental large-diameter burner with uniform gas supply and high-efficiency anti-backfire according to claim 1, characterized in that: The wake gas outlet holes (15) face the wake gas rectifying ring (17).

8. A large-caliber burner for experiments with uniform gas supply and high-efficiency backfire prevention according to claim 1, characterized in that: The connection between the rectifying sleeve (2) and the gas guiding pipe (5) is sealed.

9. An experimental large-diameter burner with uniform gas supply and high-efficiency backfire prevention according to claim 1, characterized in that: The connection between the wake sleeve (4) and the wake gas guiding pipe (6) is sealed.

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