Safety protection device for hydrogen doping of natural gas

Abstract

The invention relates to the technical field of hydrogen doping of natural gas, and discloses a safety protection device for hydrogen doping of natural gas, the safety protection device comprises a supporting frame, the upper surface of the supporting frame is fixedly connected with a first protection box and a second protection box, and the interior of the first protection box is fixedly connected with a natural gas pipe; a hydrogen pipe is fixedly connected to the interior of the second protection box; the exhaust mechanism is mounted on the outer walls of the first protection box and the second protection box and used for exhausting air; the exhaust mechanism comprises a communicating pipe. The fan is started to enable air to flow into the ventilation pipe from the communication pipe, then the air in the first protection box and the second protection box flows into the communication pipe, the flowing air is detected through a probe of the gas sensor, and when natural gas or hydrogen is detected, an alarm is given out through the alarm. And the operation power of the fan is increased to enable the air to quickly flow, so that the effect of quickly discharging the leaked air to prevent gathering is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas hydrogen blending, and specifically to a safety protection device for natural gas hydrogen blending. Background Art

[0002] In the prior art of natural gas hydrogen blending, safety has always been an unavoidable issue. Although there are already some protection means, in many cases, their response speed is not ideal. For example, after a leakage occurs, the gas sensor reacts slowly, resulting in a delayed alarm. By the time it is discovered, the gas has already spread, and the hidden danger has become an accident.

[0003] In the prior art during the process of natural gas hydrogen blending, most equipment lacks effective monitoring and exhaust mechanisms for hydrogen leakage. Hydrogen itself is highly flammable, and it is difficult to be detected and controlled in a timely manner when leaking. Existing mixing equipment often relies on a single detection means. Once a gas leakage occurs, the equipment cannot respond quickly. As a result, the leaked gas may accumulate, increasing the explosion risk. During the process of natural gas hydrogen blending, the exhaust system for gas leakage is often not designed efficiently. Many existing technologies only rely on natural ventilation or simple mechanical exhaust, and cannot effectively exhaust the leaked gas in a timely manner.

[0004] The pressure control technology for hydrogen pipelines is usually relatively simple. Many existing technologies can only rely on traditional pressure valves. When the pressure in the hydrogen pipeline is too high, the pressure relief valve comes into play, but by this time, the amount of hydrogen leakage may already be relatively large. Existing hydrogen storage devices also do not have flexible pressure regulation and gas recovery capabilities. Once a leakage occurs, it is very difficult to effectively store the hydrogen again. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a safety protection device for natural gas hydrogen blending, which solves the problems of difficult timely removal of gas leakage, insensitive detection, and inaccurate pressure control during the process of natural gas hydrogen blending.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A safety protection device for natural gas hydrogen blending, comprising:

[0007] A support frame, on the upper surface of which a first protection box and a second protection box are respectively fixedly connected. Inside the first protection box, a natural gas pipe is fixedly connected, and inside the second protection box, a hydrogen gas pipe is fixedly connected;

[0008] An exhaust mechanism, which is installed on the outer walls of the first protection box and the second protection box and is used to discharge air;

[0009] The exhaust mechanism includes a connecting pipe, both end portions of the connecting pipe are fixedly connected inside the first protective box and the second protective box, a ventilation pipe is fixedly connected to the upper surface of the connecting pipe, a gas sensor is fixedly connected inside the ventilation pipe, one end of the gas sensor is fixedly connected to an alarm, and a fan is fixedly connected inside the ventilation pipe;

[0010] An adsorption mechanism, which is installed at one end of the exhaust mechanism and is used for adsorbing natural gas and hydrogen;

[0011] A shielding mechanism, which is respectively installed on the upper surfaces of the first protective box and the second protective box and is used for shielding the openings.

[0012] Preferably, the adsorption mechanism includes an adsorption box, the lower surface of the adsorption box is fixedly connected to the upper surface of the ventilation pipe, an adsorption frame is slidably connected inside the adsorption box, activated carbon is arranged inside the adsorption frame, an exhaust pipe is fixedly connected to the upper surface of the adsorption box, a limiting component is arranged on one side of the adsorption box, and a support column is fixedly connected to the outer wall of the adsorption box, and the lower surface of the support column is fixedly connected to the upper surface of the support frame.

[0013] Preferably, the limiting component includes a first fixing block, the outer wall of the first fixing block is fixedly connected to the outer wall of the adsorption box, a limiting pin is slidably connected inside the first fixing block, one end of the limiting pin is fixedly connected to a first spring, one end of the first spring is fixedly connected to the inner wall of the adsorption frame, a sliding block is fixedly connected to the outer wall of the limiting pin, and the outer wall of the sliding block is slidably connected to the outer wall of the adsorption frame.

[0014] Preferably, the shielding mechanism includes a sealing plate, one sides of the two sealing plates are respectively rotatably connected to the upper surfaces of the first protective box and the second protective box, a fixing plate is fixedly connected to the upper surface of the sealing plate, the outer wall of the sealing plate is slidably connected inside the first protective box and the second protective box, and a fixing component is arranged on one side of the sealing plate.

[0015] Preferably, the fixing component includes a second fixing block, the lower surfaces of the two second fixing blocks are respectively fixedly connected to the upper surfaces of the first protective box and the second protective box, a sliding pin is slidably connected inside the second fixing block, a second spring is sleeved on the outer wall of the sliding pin, one end of the second spring is fixedly connected to the inner wall of the second fixing block, and the outer wall of the sliding pin is slidably connected to the inside of the fixing plate.

[0016] Preferably, fixing frames are fixedly connected to the outer walls of the first protective box and the second protective box, a filter frame is slidably connected inside the fixing frame, and a filter screen is arranged inside the filter frame.

[0017] Preferably, a pressure relief valve is fixedly connected to the outer wall of the hydrogen gas pipe. One end of the pressure relief valve is fixedly connected to a connecting pipe, and the outer wall of the connecting pipe is fixedly connected to the inner wall of the second protective box.

[0018] Preferably, one end of the connecting pipe is fixedly connected to a storage tank. A fixing frame is fixedly connected to the outer wall of the storage tank, and the outer wall of the fixing frame is fixedly connected to one side of the support frame.

[0019] Preferably, check valves are fixedly connected to one ends of the hydrogen gas pipe and the natural gas pipe respectively. The other ends of the check valves are fixedly connected to a mixer.

[0020] Preferably, the lower surface of the mixer is fixed on the upper surface of the support frame, and a delivery pipe is fixedly connected to the outer wall of the mixer.

[0021] The present invention provides a safety protection device for hydrogen-doped natural gas. It has the following beneficial effects:

[0022] 1. In the present invention, by starting the fan, air flows into the inside of the ventilation pipe from the communicating pipe, so that the air in the first protective box and the second protective box flows into the communicating pipe. Then, the probe of the gas sensor detects the flowing air. When natural gas or hydrogen is detected, an alarm is issued by the alarm, and the operating power of the fan is increased to make the air flow quickly, so as to quickly discharge the leaked gas and prevent it from accumulating.

[0023] 2. In the present invention, air is conveyed into the inside of the adsorption box through the ventilation pipe, so that the air passes through the activated carbon. The activated carbon adsorbs natural gas and hydrogen in the air, and the air is discharged through the exhaust pipe, so as to discharge the air into the high altitude. By pulling the sliding block to drive the limit pin to move, the limit pin slides inside the adsorption frame, and the limit pin slides out of the first fixing block. Then, by pulling the adsorption frame to slide inside the adsorption box, the adsorption frame can be taken out to replace the activated carbon.

[0024] 3. In the present invention, when the internal pressure of the hydrogen gas pipe is too high, the pressure relief valve conveys hydrogen into the inside of the connecting pipe, and the excess hydrogen is conveyed into the inside of the storage tank through the connecting pipe, so as to store hydrogen through the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional view of the present invention;

[0026] Figure 2 is a side view of the present invention;

[0027] Figure 3 is a schematic diagram of the exhaust pipe of the present invention;

[0028] Figure 4 is a cross-sectional view of the ventilation pipe of the present invention;

[0029] Figure 5 Cross-sectional view of the adsorption frame of the present invention;

[0030] Figure 6 Cross-sectional view of the adsorption tank of the present invention;

[0031] Figure 7 Schematic diagram of the storage tank of the present invention;

[0032] Figure 8 Schematic diagram of the sealing plate of the present invention.

[0033] Among them, 1. Support frame; 2. Mixer; 3. Delivery pipe; 4. Exhaust mechanism; 401. Connecting pipe; 402. Ventilation pipe; 403. Gas sensor; 404. Alarm; 405. Fan; 5. Adsorption mechanism; 501. Adsorption tank; 502. Adsorption frame; 503. First fixing block; 504. Limit pin; 505. Sliding block; 506. First spring; 507. Activated carbon; 6. Filter screen; 7. Hydrogen pipe; 8. Natural gas pipe; 9. First protection box; 10. Second protection box; 11. Fixing frame; 12. Storage tank; 13. Exhaust pipe; 14. Shielding mechanism; 1401. Second fixing block; 1402. Sliding pin; 1403. Second spring; 1404. Fixing plate; 1405. Sealing plate; 15. Support column; 16. Connecting pipe; 17. Pressure relief valve; 18. Check valve; 19. Filter frame; 20. Fixing frame. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to the attached Figure 1 - attached Figure 8 , the embodiments of the present invention provide a safety protection device for natural gas hydrogen blending, including; a support frame 1, a first protection box 9 and a second protection box 10 are respectively fixedly connected to the upper surface of the support frame 1, a natural gas pipe 8 is fixedly connected to the inside of the first protection box 9, and a hydrogen pipe 7 is fixedly connected to the inside of the second protection box 10;

[0036] An exhaust mechanism 4, which is installed on the outer walls of the first protective box 9 and the second protective box 10 and is used to discharge air; the exhaust mechanism 4 includes a connecting pipe 401, both ends of the connecting pipe 401 are fixedly connected to the inside of the first protective box 9 and the second protective box 10, a ventilation pipe 402 is fixedly connected to the upper surface of the connecting pipe 401, a gas sensor 403 is fixedly connected to the inside of the ventilation pipe 402, an alarm 404 is fixedly connected to one end of the gas sensor 403, and a fan 405 is fixedly connected to the inside of the ventilation pipe 402;

[0037] Specifically, by starting the fan 405, air flows from the connecting pipe 401 into the inside of the ventilation pipe 402, so that the air in the first protective box 9 and the second protective box 10 flows into the connecting pipe 401. Then, the probe of the gas sensor 403 detects the flowing air. When it detects that the air contains natural gas or hydrogen, an alarm is issued through the alarm 404, and the operating power of the fan 405 is increased to make the air flow quickly, so as to quickly discharge the leaked gas.

[0038] An adsorption mechanism 5, which is installed at one end of the exhaust mechanism 4 and is used to adsorb natural gas and hydrogen; the adsorption mechanism 5 includes an adsorption box 501, the lower surface of the adsorption box 501 is fixedly connected to the upper surface of the ventilation pipe 402, an adsorption frame 502 is slidably connected to the inside of the adsorption box 501, activated carbon 507 is arranged inside the adsorption frame 502, an exhaust pipe 13 is fixedly connected to the upper surface of the adsorption box 501, a limiting component is arranged on one side of the adsorption box 501, the outer wall of the fixed adsorption box 501 is fixedly connected to a fixed support column 15, and the lower surface of the fixed support column 15 is fixedly connected to the upper surface of the fixed support frame 1; the limiting component includes a first fixing block 503, the outer wall of the first fixing block 503 is fixedly connected to the outer wall of the adsorption box 501, a limiting pin 504 is slidably connected to the inside of the first fixing block 503, a first spring 506 is fixedly connected to one end of the limiting pin 504, a first spring 506 is fixedly connected to the inner wall of the adsorption frame 502, and a sliding block 505 is fixedly connected to the outer wall of the limiting pin 504. The outer wall of the sliding block 505 is slidably connected to the outer wall of the adsorption frame 502;

[0039] Specifically, air is conveyed into the interior of the adsorption box 501 through the ventilation pipe 402, and then the air passes through the activated carbon 507. The activated carbon 507 adsorbs natural gas and hydrogen in the air, and the air is discharged through the exhaust pipe 13 and then discharged into the high altitude. By pulling the sliding block 505, the limit pin 504 is driven to move, so that the limit pin 504 slides inside the adsorption frame 502 and slides out of the first fixing block 503. Then, by pulling the adsorption frame 502 to slide inside the adsorption box 501, the adsorption frame 502 is taken out to replace the activated carbon 507. By inserting the adsorption frame 502 into the interior of the adsorption box 501, the first spring 506 pushes the limit pin 504 to drive the sliding block 505 to move, so that the limit pin 504 is inserted into the interior of the first fixing block 503, thereby fixing the adsorption frame 502.

[0040] The shielding mechanism 14 is respectively installed on the upper surfaces of the first protective box 9 and the second protective box 10 for shielding the openings. The shielding mechanism 14 includes a sealing plate 1405. One sides of the two sealing plates 1405 are respectively rotatably connected to the upper surfaces of the first protective box 9 and the second protective box 10. A fixing plate 1404 is fixedly connected to the upper surface of the sealing plate 1405. The outer wall of the sealing plate 1405 slides inside the first protective box 9 and the second protective box 10. A fixing component is arranged on one side of the sealing plate 1405. The fixing component includes a second fixing block 1401. The lower surfaces of the two second fixing blocks 1401 are respectively fixedly connected to the upper surfaces of the first protective box 9 and the second protective box 10. A sliding pin 1402 slides inside the second fixing block 1401. A second spring 1403 is sleeved on the outer wall of the sliding pin 1402. One end of the second spring 1403 is fixedly connected to the inner wall of the second fixing block 1401. The outer wall of the sliding pin 1402 slides inside the fixing plate 1404.

[0041] Specifically, by pulling the sliding pin 1402 to slide inside the second fixing block 1401 and squeezing the second spring 1403, the sliding pin 1402 slides out of the fixing plate 1404. Then, by pulling the fixing plate 1404 to drive the sealing plate 1405 to move, the sealing plate 1405 rotates on the first protective box 9 and the second protective box 10, so that the first protective box 9 and the second protective box 10 can be opened to repair the internal equipment. By pulling the fixing plate 1404 to drive the sealing plate 1405 to rotate and slide on the first protective box 9 and the second protective box 10, the second spring 1403 pushes the sliding pin 1402 to slide inside the second fixing block 1401, so that the sliding pin 1402 is inserted into the fixing plate 1404, thereby fixing the sealing plate 1405.

[0042] Fixing frames 20 are fixedly connected to the outer walls of both the first protective box 9 and the second protective box 10. A filter frame 19 is slidably connected inside the fixing frame 20, and a filter net 6 is arranged inside the filter frame 19;

[0043] Specifically, by starting the fan 405, the air inside the first protective box 9 and the second protective box 10 is pumped out, so that the air enters the inside of the first protective box 9 and the second protective box 10 through the filter net 6, and then the air is filtered through the filter net 6 to prevent dust from entering the inside. By pulling out the filter frame 19 from the inner wall of the fixing frame 20, the filter net 6 can be taken out for replacement.

[0044] A pressure relief valve 17 is fixedly connected to the outer wall of the hydrogen pipe 7. One end of the pressure relief valve 17 is fixedly connected to a connecting pipe 16, and the outer wall of the connecting pipe 16 is fixedly connected to the inner wall of the second protective box 10; One end of the connecting pipe 16 is fixedly connected to a storage tank 12, and a fixing frame 11 is fixedly connected to the outer wall of the storage tank 12, and the outer wall of the fixing frame 11 is fixedly connected to one side of the support frame 1;

[0045] Specifically, when the internal pressure of the hydrogen pipe 7 is too high, the pressure relief valve 17 transports hydrogen into the inside of the connecting pipe 16, and the excess hydrogen is transported into the inside of the storage tank 12 through the connecting pipe 16, so that the hydrogen is stored in the storage tank 12.

[0046] Check valves 18 are fixedly connected to one ends of both the hydrogen pipe 7 and the natural gas pipe 8. The other ends of the check valves 18 are fixedly connected to a mixer 2; The lower surface of the mixer 2 is fixed on the upper surface of the support frame 1, and a delivery pipe 3 is fixedly connected to the outer wall of the mixer 2;

[0047] Specifically, hydrogen is transported through the hydrogen pipe 7 and transported into the inside of the mixer 2 through the check valve 18. Natural gas is transported through the natural gas pipe 8 and transported into the inside of the mixer 2 through the check valve 18. The mixer 2 mixes the incoming natural gas and hydrogen, and transports the mixed natural gas through the delivery pipe 3.

[0048] Working principle: First, hydrogen is transported through the hydrogen pipe 7 and delivered to the inside of the mixer 2 through the check valve 18. Natural gas is transported through the natural gas pipe 8 and delivered to the inside of the mixer 2 through the check valve 18. The mixer 2 mixes the incoming natural gas and hydrogen, and the mixed natural gas is transported through the delivery pipe 3. By starting the fan 405, air flows from the connecting pipe 401 into the inside of the ventilation pipe 402, so that the air in the first protective box 9 and the second protective box 10 flows into the connecting pipe 401, and the air inside the first protective box 9 and the second protective box 10 is pumped out. Then, the air enters the inside of the first protective box 9 and the second protective box 10 through the filter screen 6, and the air is filtered through the filter screen 6 to prevent dust from entering the inside. The filter screen 6 can be taken out for replacement by pulling the filter frame 19 out of the inner wall of the fixed frame 20. Then, the probe of the gas sensor 403 detects the flowing air. When natural gas or hydrogen is detected in the air, an alarm is issued through the alarm 404, and the operating power of the fan 405 is increased to make the air flow rapidly, so as to quickly discharge the leaked gas. The air is transported to the inside of the adsorption box 501 through the ventilation pipe 402, and then the air passes through the activated carbon 507. The activated carbon 507 adsorbs natural gas and hydrogen in the air, and the air is discharged through the exhaust pipe 13, and then the air is discharged into the high altitude. By pulling the sliding block 505 to drive the limit pin 504 to move, the limit pin 504 slides inside the adsorption frame 502, and the limit pin 504 slides out of the first fixing block 503. Then, by pulling the adsorption frame 502 to slide inside the adsorption box 501, the adsorption frame 502 is taken out to replace the activated carbon 507. By inserting the adsorption frame 502 into the inside of the adsorption box 501, the first spring 506 pushes the limit pin 504 to drive the sliding block 505 to move, so that the limit pin 504 is inserted into the inside of the first fixing block 503, and thus the adsorption frame 502 is fixed. By pulling the sliding pin 1402 to slide inside the second fixing block 1401 and squeezing the second spring 1403, the sliding pin 1402 slides out of the fixing plate 1404. Then, by pulling the fixing plate 1404 to drive the sealing plate 1405 to move, the sealing plate 1405 rotates on the first protective box 9 and the second protective box 10, and thus the first protective box 9 and the second protective box 10 can be opened to repair the internal equipment. By pulling the fixing plate 1404 to drive the sealing plate 1405 to rotate and slide on the first protective box 9 and the second protective box 10, the second spring 1403 pushes the sliding pin 1402 to slide inside the second fixing block 1401, so that the sliding pin 1402 is inserted into the fixing plate 1404, and thus the sealing plate 1405 is fixed. When the internal pressure of the hydrogen pipe 7 is too high, the pressure relief valve 17 transports hydrogen to the inside of the connecting pipe 16, and the excess hydrogen is transported to the inside of the storage tank 12 through the connecting pipe 16.Thus, hydrogen is stored through the storage tank 12.,

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety protection device for hydrogen-doped natural gas, characterized in that, Comprising; A support frame (1), on the upper surface of which a first protective box (9) and a second protective box (10) are respectively fixedly connected. Inside the first protective box (9), a natural gas pipe (8) is fixedly connected, and inside the second protective box (10), a hydrogen gas pipe (7) is fixedly connected; An exhaust mechanism (4), which is installed on the outer walls of the first protective box (9) and the second protective box (10) for exhausting air; The exhaust mechanism (4) includes a connecting pipe (401), both ends of which are fixedly connected inside the first protective box (9) and the second protective box (10). On the upper surface of the connecting pipe (401), a ventilation pipe (402) is fixedly connected. Inside the ventilation pipe (402), a gas sensor (403) is fixedly connected. One end of the gas sensor (403) is fixedly connected to an alarm (404), and a fan (405) is fixedly connected inside the ventilation pipe (402); An adsorption mechanism (5), which is installed at one end of the exhaust mechanism (4) for adsorbing natural gas and hydrogen; A shielding mechanism (14), which is respectively installed on the upper surfaces of the first protective box (9) and the second protective box (10) for shielding the openings.

2. The safety protection device for natural gas hydrogen blending according to claim 1, wherein The adsorption mechanism (5) includes an adsorption box (501), the lower surface of which is fixedly connected to the upper surface of the ventilation pipe (402). Inside the adsorption box (501), an adsorption frame (502) is slidably connected. Inside the adsorption frame (502), activated carbon (507) is provided. On the upper surface of the adsorption box (501), an exhaust pipe (13) is fixedly connected. On one side of the adsorption box (501), a limiting component is provided. On the outer wall of the adsorption box (501), a support column (15) is fixedly connected, and the lower surface of the support column (15) is fixedly connected to the upper surface of the support frame (1).

3. The safety protection device for natural gas hydrogen blending according to claim 2, characterized in that, The limiting component includes a first fixing block (503), the outer wall of which is fixedly connected to the outer wall of the adsorption box (501). Inside the first fixing block (503), a limiting pin (504) is slidably connected. One end of the limiting pin (504) is fixedly connected to a first spring (506), and one end of the first spring (506) is fixedly connected to the inner wall of the adsorption frame (502). On the outer wall of the limiting pin (504), a sliding block (505) is fixedly connected, and the outer wall of the sliding block (505) is slidably connected to the outer wall of the adsorption frame (502).

4. A safety protection device for natural gas hydrogen blending according to claim 1, characterized in that, The shielding mechanism (14) includes a sealing plate (1405), one sides of the two sealing plates (1405) are respectively rotatably connected to the upper surfaces of the first protective box (9) and the second protective box (10). On the upper surface of the sealing plate (1405), a fixing plate (1404) is fixedly connected. The outer wall of the sealing plate (1405) is slidably connected inside the first protective box (9) and the second protective box (10). On one side of the sealing plate (1405), a fixing component is provided.

5. The safety protection device for natural gas hydrogen blending according to claim 4, characterized in that, The fixed component includes a second fixed block (1401). The lower surfaces of the two second fixed blocks (1401) are respectively fixedly connected to the upper surfaces of the first protective box (9) and the second protective box (10). A sliding pin (1402) is slidably connected inside the second fixed block (1401). A second spring (1403) is sleeved on the outer wall of the sliding pin (1402). One end of the second spring (1403) is fixedly connected to the inner wall of the second fixed block (1401). The outer wall of the sliding pin (1402) is slidably connected inside a fixing plate (1404).

6. The safety protection device for natural gas hydrogen blending according to claim 1, characterized in that, Fixing frames (20) are fixedly connected to the outer walls of the first protective box (9) and the second protective box (10). A filter frame (19) is slidably connected inside the fixing frame (20). A filter net (6) is arranged inside the filter frame (19).

7. A safety protection device for natural gas hydrogen blending according to claim 1, characterized in that, A pressure relief valve (17) is fixedly connected to the outer wall of the hydrogen pipe (7). One end of the pressure relief valve (17) is fixedly connected to a connecting pipe (16). The outer wall of the connecting pipe (16) is fixedly connected to the inner wall of the second protective box (10).

8. The safety protection device for natural gas hydrogen blending according to claim 7, characterized in that, One end of the connecting pipe (16) is fixedly connected to a storage tank (12). A fixing frame (11) is fixedly connected to the outer wall of the storage tank (12). The outer wall of the fixing frame (11) is fixedly connected to one side of the support frame (1).

9. The safety protection device for natural gas hydrogen blending according to claim 1, wherein, Check valves (18) are fixedly connected to one ends of the hydrogen pipe (7) and the natural gas pipe (8). The other ends of the check valves (18) are fixedly connected to a mixer (2).

10. The safety protection device for natural gas hydrogen blending according to claim 9, characterized in that, The lower surface of the mixer (2) is fixed to the upper surface of the support frame (1). A delivery pipe (3) is fixedly connected to the outer wall of the mixer (2).

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