Natural gas hydrogen-doped gas leakage intelligent turn-off device

Abstract

The invention relates to the field of natural gas hydrogen doping technology and hydrogen transmission and distribution, and discloses a natural gas hydrogen doping gas leakage intelligent shutoff device which comprises a conveying pipe, a gas inlet pipe and a shutoff mechanism. Flanges are arranged at the close ends of the conveying pipe and the gas inlet pipe, and the outer sides of the two flanges are assembled in an attached mode; the turn-off mechanism comprises a turn-off assembly and a trigger assembly, the trigger assembly comprises a reaction box, the reaction box is installed on the outer side of the conveying pipe and the outer side of the air inlet pipe, a through hole is formed in the outer side of the reaction box, a connecting block is arranged at the position of the through hole, and one end of the connecting block is fixedly connected with a limiting pin. When hydrogen leaks, activated carbon in the reaction box adsorbs and enriches the hydrogen, the hydrogen and chlorine rapidly react to generate hydrogen chloride through illumination, water is added to moisten the hydrogen chloride and then react with calcium carbonate, and the process can not only effectively detect hydrogen leakage, but also rapidly consume a key structure through chemical reaction after leakage occurs, and triggers a mechanical device to close an electromagnetic valve. And hydrogen conveying is blocked.

Description

Technical Field

[0001] The present invention relates to the field of natural gas hydrogen blending technology and hydrogen transportation and distribution, and specifically provides an intelligent shut-off device for natural gas hydrogen blending gas leakage. Background Art

[0002] With the continuous growth of the global demand for clean energy, natural gas hydrogen blending, as a transitional energy solution, has gradually received wide attention. Mixing a certain proportion of hydrogen into the natural gas transmission pipeline can not only improve energy utilization efficiency but also help reduce carbon emissions. However, hydrogen has characteristics such as small molecular size and strong diffusivity, which significantly increase the leakage risk of natural gas hydrogen blending gas. Once a leakage occurs, it will not only cause energy waste but also trigger serious safety accidents such as fires and explosions. Therefore, it is crucial to develop a reliable intelligent shut-off device for natural gas hydrogen blending gas leakage. Although there are already some intelligent shut-off devices on the market, they still face many challenges in complex working conditions and practical applications.

[0003] Most of the existing intelligent shut-off devices for natural gas hydrogen blending gas leakage adopt a structure based on the linkage of sensor detection and mechanical valves. Common sensors include hydrogen concentration sensors, pressure sensors, etc., which judge whether a leakage occurs by detecting changes in hydrogen concentration or pressure in the pipeline. Once the sensor detects an abnormality, it will transmit a signal to the control system, and the control system will then trigger the mechanical valve to act to close the pipeline to block gas leakage.

[0004] In actual application scenarios, the existing intelligent shut-off devices have exposed some problems. For example, in the natural gas transmission pipelines in some remote outdoor areas, the environment is complex and changeable, with electromagnetic interference, high humidity, etc. Existing sensors are prone to detection errors in such an environment, resulting in misjudgment or missed judgment of hydrogen leakage. Taking the hydrogen concentration sensor as an example, when the environmental humidity is high, moisture will be adsorbed on the surface of the sensor, affecting the accuracy of its detection of hydrogen concentration. In addition, during the long-term use of existing mechanical valves, due to factors such as gas corrosion and impurity blockage, the opening and closing flexibility of the valves will decrease. Once a hydrogen leakage occurs, the valves cannot be closed in a timely and effective manner, and thus cannot quickly block the hydrogen transmission like an ideal device, greatly increasing the safety hazard. Therefore, the present invention provides an intelligent shut-off device for natural gas hydrogen blending gas leakage to solve the deficiencies existing in the prior art. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an intelligent shut-off device for natural gas hydrogen blending gas leakage, which solves the problems that the existing intelligent shut-off device for natural gas hydrogen blending gas leakage relies on sensors to start the valve shut-off and is difficult to apply in harsh environments.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: An intelligent shut-off device for natural gas hydrogen-blended gas leakage, comprising a delivery pipe, an inlet pipe, and a shut-off mechanism. Flanges are provided at the adjacent ends of the delivery pipe and the inlet pipe, and the outer sides of the two flanges are fitted together. The shut-off mechanism includes a closing component and a triggering component. The triggering component includes a reaction box, which is installed outside the delivery pipe and the inlet pipe. A through hole is provided on the outer side of the reaction box, and a connecting block is provided at the through hole. One end of the connecting block is fixedly connected to a limit pin, and the other end of the connecting block is fixedly connected to a notched column. A filling powder is provided at the top of the notched column, and the notched column is located inside the reaction box.

[0007] Preferably, an air injection hole is provided at the top of the reaction box, a sealing plug is provided inside the air injection hole, chlorine gas is filled inside the reaction box, a window is provided at the top of the reaction box, a transparent glass is installed inside the window, and a plurality of mounting seats are fixedly connected to the top of the reaction box.

[0008] Preferably, an absorption component is provided inside the reaction box. The absorption component includes a fixed cylinder, the top of the fixed cylinder is detachably connected to the inner top wall of the reaction box, and a wide-mouth mask is fixedly connected to the bottom of the fixed cylinder.

[0009] Preferably, activated carbon blocks are provided inside the fixed cylinder, and a guiding channel is fixedly connected to the outer through port of the fixed cylinder, and the guiding channel is located directly above the filling powder.

[0010] Preferably, the closing component includes an electromagnetic valve, a valve switch is installed outside the electromagnetic valve, and a main control button is provided at the top of the valve switch.

[0011] Preferably, an L-shaped block is fixedly connected to the top of the valve switch, a telescopic rod is provided inside the L-shaped block, and a spring is sleeved outside the telescopic rod.

[0012] Preferably, a sliding plate is fixedly connected to the outside of the telescopic rod, the outside of the sliding plate is slidably connected to the inside of the L-shaped block, one end of the spring is fixedly connected to the inside of the L-shaped block, and the other end of the spring is fixedly connected to the top of the sliding plate.

[0013] Preferably, the telescopic rod is located directly above the main control button, and the bottom of the sliding plate is in contact with the outside of the limit pin.

[0014] The present invention provides an intelligent shut-off device for natural gas hydrogen-blended gas leakage. It has the following

[0015] Beneficial effects:

[0016] The present invention achieves the effect of triggering the valve to close through the mechanical structure and chemical reaction design. When hydrogen leaks, the activated carbon in the reaction box absorbs and enriches the hydrogen, and light is used to make the hydrogen and chlorine react quickly to generate hydrogen chloride. Water is added to make it moist and then react with calcium carbonate. This process can not only effectively detect hydrogen leakage, but also quickly consume key structures through chemical reactions after the leakage occurs, triggering the mechanical device to close the solenoid valve and block the hydrogen transportation. At the same time, the linked buzzer alarm notifies personnel in time, and all-round protection from detection, blocking to warning is provided, which greatly reduces the risk of safety accidents caused by hydrogen leakage and provides reliable protection for the safe and stable operation of the natural gas hydrogen blending and transportation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention;

[0018] Figure 2 It is a schematic diagram of the L-shaped block structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the internal structure of the reaction box of the present invention;

[0020] Figure 4 It is a schematic diagram of the fixed cylinder structure of the present invention;

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0022] Among them, 1. delivery pipe; 2. air inlet pipe; 3. flange; 4. solenoid valve; 5. valve switch; 6. main control button; 7. L-shaped block; 8. telescopic rod; 9. spring; 10. sliding plate; 11. reaction box; 12. air injection hole; 13. sealing plug; 14. window; 15. fixing cylinder; 16. wide mask; 17. guide channel; 18. notched column; 19. filling powder; 20. connecting block; 21. limit pin; 22. mounting seat; 23. activated carbon block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Please refer to the attached Figure 1 -Attached Figure 5, an embodiment of the present invention provides an intelligent shut-off device for natural gas hydrogen-blended gas leakage, including a delivery pipe 1, an inlet pipe 2, and a shut-off mechanism. Flanges 3 are provided at the adjacent ends of the delivery pipe 1 and the inlet pipe 2, and the outer sides of the two flanges 3 are fitted together. This connection part is the key area for hydrogen leakage. The shut-off mechanism, as the core part, consists of a closing component and a triggering component. The triggering component includes a reaction box 11, and the reaction box 11 is installed on the outer sides of the delivery pipe 1 and the inlet pipe 2. The special design of the reaction box 11 is aimed at efficiently capturing and processing the leaked hydrogen. Through holes are provided on the outer side of the reaction box 11, and connection blocks 20 are provided at the through holes.One end of the connecting block 20 is firmly connected to the limit pin 21, and the other end is fixedly connected to the notched column 18. The connecting block 20 is made of a loose porous calcium carbonate solid material, which has a large specific surface area and can significantly increase the contact area with the reaction gas, thereby accelerating the subsequent chemical reaction rate. The top of the notched column 18 is provided with a filling powder 19, and the filling powder 19 is calcium carbonate powder, which also has high reactivity due to its fine particle state. An air injection hole 12 is opened at the top of the reaction box 11. As a key substance for reacting with hydrogen, chlorine gas needs to be filled into the reaction box 11 from the air injection hole 12 before the device is started. After filling, the sealing plug 13 tightly plugs the air injection hole 12 to ensure that a relatively closed space is formed inside the reaction box 11, preventing the leakage of chlorine gas and the interference of external air, and ensuring the efficient progress of the reaction between hydrogen and chlorine. A window 14 is opened at the top of the reaction box 11, and a transparent glass is installed inside the window 14. This design allows natural light from the outside to enter, providing light conditions for the reaction between hydrogen and chlorine. If the external light is insufficient, lamps can be installed on multiple mounting seats 22 fixedly connected to the top of the reaction box 11. These lamps can provide stable and sufficient light to meet the light intensity requirements for the reaction, promoting the rapid reaction between hydrogen and chlorine under light catalysis to generate hydrogen chloride gas. An absorption component is arranged inside the reaction box 11. The absorption component includes a fixed cylinder 15. The top of the fixed cylinder 15 is fixedly connected to the inner top wall of the reaction box 11 by a detachable connection method. This detachable design facilitates the operation of the absorption component during device maintenance or component replacement. The bottom of the fixed cylinder 15 is fixedly connected to a wide-mouth mask 16. The wide-mouth mask 16 can expand the capture range of the leaked hydrogen, enabling more hydrogen to enter the inside of the fixed cylinder 15. An activated carbon block 23 is arranged inside the fixed cylinder 15. Activated carbon has extremely strong adsorption performance and can quickly attract and enrich the hydrogen leaked into the reaction box 11 from the flange 3 connection, gathering the hydrogen around itself, increasing the concentration of hydrogen in the reaction area, and thus accelerating the reaction rate between hydrogen and chlorine. A guiding channel 17 is fixedly connected to the outer through port of the fixed cylinder 15. The guiding channel 17 is located directly above the filling powder 19 and is inclined. The closing component includes a solenoid valve 4. A valve switch 5 is installed outside the solenoid valve 4. A main control button 6 is arranged on the top of the valve switch 5. An L-shaped block 7 is fixedly connected to the top of the valve switch 5. A telescopic rod 8 is arranged inside the L-shaped block 7. A spring 9 is sleeved outside the telescopic rod 8. A sliding plate 10 is fixedly connected to the outside of the telescopic rod 8. The outside of the sliding plate 10 is slidably connected to the inside of the L-shaped block 7. One end of the spring 9 is fixedly connected to the inside of the L-shaped block 7, and the other end of the spring 9 is fixedly connected to the top of the sliding plate 10. In the initial state, the bottom of the sliding plate 10 is in contact with the outside of the limit pin 21, and the telescopic rod 8 is directly above the main control button 6.

[0025] Specifically, first, chlorine gas needs to be injected into the interior of the reaction chamber 11 through the gas injection hole 12. The purpose of designing the gas injection hole 12 is to facilitate the replenishment of chlorine gas participating in the reaction to the reaction chamber 11. Its size and structure are specially designed to be compatible with professional chlorine gas injection equipment, ensuring that chlorine gas can be injected into the reaction chamber 11 smoothly, quickly, and safely. After the chlorine gas injection is completed, the sealing plug 13 should be quickly tightened for sealing. The sealing plug 13 is made of a material with excellent sealing performance, such as rubber, and its connection method with the gas injection hole 12 is tight and stable, which can effectively prevent chlorine gas from leaking into the external environment, avoiding potential safety hazards, and at the same time ensuring the concentration of chlorine gas inside the reaction chamber 11, creating good conditions for the subsequent reaction with hydrogen gas. When the device is in the normal process of transporting natural gas hydrogen-doped gas, if hydrogen gas leaks at the connection of the two flanges 3, the leaked hydrogen gas will enter the interior of the reaction chamber 11 by virtue of the diffusion characteristics of gas molecules and the pressure difference inside and outside the reaction chamber 11. The hydrogen gas entering the reaction chamber 11 will immediately be attracted and concentrated by the activated carbon blocks 23. The activated carbon blocks 23 have a rich pore structure and a large specific surface area. This special physical structure endows them with a strong adsorption capacity for hydrogen gas. By adsorbing hydrogen gas, the activated carbon blocks 23 can increase the concentration of hydrogen gas in a local area inside the reaction chamber 11, making the hydrogen gas more concentratedly distributed in the reaction-active area, thus providing sufficient reactants for the reaction between hydrogen gas and chlorine gas. The window 14 at the top of the reaction chamber 11 plays a crucial role. It can receive natural light from the outside. In the daytime when the light is sufficient, natural light passes through the transparent glass and enters the interior of the reaction chamber 11, providing the energy required for the reaction between hydrogen gas and chlorine gas. If it is at night or in an environment with insufficient light, lamps can also be installed on the mounting seat 22 to provide light. The design of the mounting seat 22 makes the installation of the lamps very convenient and stable, ensuring that the lamps can accurately project light onto the reaction area. Under the action of light, hydrogen gas and chlorine gas will undergo a rapid chemical reaction to generate hydrogen chloride gas, with a fast reaction speed and high efficiency. A small amount of water is added to the concave area surrounded by the top of the activated carbon blocks 23 and the fixed cylinder 15. The added water can interact with the generated hydrogen chloride gas. Since hydrogen chloride gas is highly soluble in water, it will quickly form a hydrochloric acid solution when it meets water, that is, making the hydrogen chloride gas become moist. The moist hydrogen chloride gas will be precisely guided by the inclined guiding channel 17 to flow towards the filling powder 19. The inclined design of the guiding channel 17 conforms to the principles of fluid mechanics and can utilize the gravity effect to enable the moist hydrogen chloride gas to flow smoothly from a high place to a low place and fully contact with the filling powder 19. The filling powder 19 is calcium carbonate powder, and the connecting block 20 is a porous calcium carbonate solid. Calcium carbonate is alkaline and can undergo a chemical reaction with acidic hydrochloric acid.Since the filling powder 19 is in powder form and has a large specific surface area, and the porous structure of the connecting block 20 also greatly increases its contact area with hydrochloric acid, this enables the reaction to proceed rapidly. Under the action of moist hydrogen chloride gas, calcium carbonate will be gradually consumed. After a few minutes, the connecting block 20 will be reacted away. After the connecting block 20 is reacted away, the limit pin 21 loses its support and cannot withstand the pressure exerted by the spring 9. The spring 9 is in a compressed state in the initial state and stores a certain amount of elastic potential energy. When the limit pin 21 cannot provide resistance, the spring 9 will quickly release the elastic potential energy and push the sliding plate 10 downward. The sliding plate 10 is fixedly connected to the telescopic rod 8, so it will drive the telescopic rod 8 to move downward rapidly. After the telescopic rod 8 moves downward, it will trigger the main control button 6. The main control button 6 is the key component to start the valve switch 5. When it is triggered, it will immediately start the valve switch 5. The valve switch 5 controls the opening and closing states of the solenoid valve 4. After starting, it will cause the solenoid valve 4 to close rapidly. After the solenoid valve 4 closes, it can effectively block the transmission of hydrogen and prevent more hydrogen from leaking to the outside, ensuring the safety of the entire transmission system. And the main control button 6 can also be linked with the buzzer alarm after being triggered. The buzzer alarm can emit a loud and obvious alarm sound, timely reminding relevant personnel that hydrogen has leaked and has been blocked by the device. In this way, the staff can quickly take further measures, such as checking the leakage point and carrying out repairs, so as to avoid the occurrence of safety accidents and ensure the safety of production and personnel.

[0026] Working principle: First, inject chlorine gas into the interior of the reaction tank 11 from the injection hole 12, and then tightly plug the sealing plug 13 to seal. The hydrogen leaked from the connection of the two flanges 3 will enter the interior of the reaction tank 11 and be attracted and enriched by the activated carbon block 23. The window 14 can receive external light, or a lamp can be installed on the mounting seat 22 to provide light. In this way, the leaked hydrogen and chlorine gas react rapidly to generate hydrogen chloride gas. Add a small amount of water to the concave area surrounded by the top of the activated carbon block 23 and the fixed cylinder 15, so that the generated hydrogen chloride gas becomes moist. And the moist hydrogen chloride gas will be guided by the inclined guiding channel 17 to contact and react with the filling powder 19. The filling powder 19 is calcium carbonate powder, and the connecting block 20 is a porous calcium carbonate solid. In this way, the connecting block 20 can be reacted away within a few minutes, making the limit pin 21 unable to block the pressure exerted by the spring 9. Furthermore, the sliding plate 10 drives the telescopic rod 8 to move downward rapidly to trigger the main control button 6 to start the valve switch 5, so that the solenoid valve 4 closes, thus blocking the transmission of hydrogen. And the main control button 6 can also be linked with the buzzer alarm after being triggered to remind relevant personnel that the hydrogen leakage has been blocked.

[0027] 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. An intelligent shut-off device for natural gas-hydrogen blended gas leakage, comprising a delivery pipe (1), an inlet pipe (2) and a shut-off mechanism, characterized in that, Flanges (3) are provided at the adjacent ends of the conveying pipe (1) and the air inlet pipe (2). The outer sides of the two flanges (3) are fitted together. The shut-off mechanism includes a closing component and a triggering component. The triggering component includes a reaction box (11). The reaction box (11) is installed on the outer sides of the conveying pipe (1) and the air inlet pipe (2). A through hole is provided on the outer side of the reaction box (11), and a connecting block (20) is provided at the through hole. One end of the connecting block (20) is fixedly connected with a limit pin (21), and the other end of the connecting block (20) is fixedly connected with a notched column (18). A filling powder (19) is provided at the top of the notched column (18). The notched column (18) is located inside the reaction box (11).

2. The intelligent shut-off device for natural gas hydrogen-blended gas leakage according to claim 1, characterized in that, An air injection hole (12) is provided at the top of the reaction box (11). A sealing plug (13) is provided inside the air injection hole (12). Chlorine gas is filled inside the reaction box (11). A window (14) is provided at the top of the reaction box (11). A transparent glass is installed inside the window (14). A plurality of mounting seats (22) are fixedly connected to the top of the reaction box (11).

3. The intelligent shut-off device for natural gas hydrogen-blended gas leakage according to claim 1, characterized in that, An absorption component is provided inside the reaction box (11). The absorption component includes a fixed cylinder (15). The top of the fixed cylinder (15) is detachably connected to the inner top wall of the reaction box (11). A wide-mouth mask (16) is fixedly connected to the bottom of the fixed cylinder (15).

4. An intelligent shut-off device for natural gas hydrogen-blended gas leakage according to claim 3, characterized in that, An activated carbon block (23) is provided inside the fixed cylinder (15). A guiding channel (17) is fixedly connected to the outer through port of the fixed cylinder (15). The guiding channel (17) is located directly above the filling powder (19).

5. An intelligent shut-off device for natural gas hydrogen-blended gas leakage according to claim 1, characterized in that, The closing component includes an electromagnetic valve (4). A valve switch (5) is installed on the outer side of the electromagnetic valve (4). A main control button (6) is provided at the top of the valve switch (5).

6. An intelligent shutdown device for natural gas mixed with hydrogen gas leakage according to claim 5, characterized in that, An L-shaped block (7) is fixedly connected to the top of the valve switch (5). A telescopic rod (8) is provided inside the L-shaped block (7). A spring (9) is sleeved outside the telescopic rod (8).

7. An intelligent shut-off device for natural gas hydrogen-blended gas leakage according to claim 6, characterized in that, A sliding plate (10) is fixedly connected to the outer side of the telescopic rod (8). The outer side of the sliding plate (10) is slidably connected to the inner side of the L-shaped block (7). One end of the spring (9) is fixedly connected to the inner side of the L-shaped block (7), and the other end of the spring (9) is fixedly connected to the top of the sliding plate (10).

8. An intelligent shut-off device for natural gas hydrogen-blended gas leakage, according to claim 7, characterized in that The telescopic rod (8) is located directly above the main control button (6). The bottom of the sliding plate (10) is in contact with the outer side of the limit pin (21).

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