Leakage monitoring device for buried hydrogen pipeline

Abstract

The invention discloses a leakage monitoring device for a buried hydrogen pipeline, which belongs to the technical field of pipeline safety monitoring and mainly comprises an underground gas collection unit, a ground indication unit and an electronic alarm unit. The ground indication unit is in butt joint with the end, away from the gas conveying pipeline, of the underground gas collection unit. The electronic alarm unit is arranged at the end, away from the underground gas collection unit, of the ground indication unit. According to the device, on-site visual indication and remote alarm of leakage are realized at the same time through a mechanical and electronic combined multiple detection mode, and the reliability and applicability of a monitoring system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline safety monitoring, in particular to a leakage monitoring device for buried hydrogen pipeline, aiming to solve the problem that the prior art cannot simultaneously meet multiple requirements such as buried applicability, simple reliability, real-time remote alarm and intuitive on-site indication. BACKGROUND

[0002] Once gas leakage occurs in the buried hydrogen pipeline, light hydrogen gas is easy to accumulate in the concealed space, forming an explosion risk. Therefore, timely and reliable detection of the leakage point is the key to the safe operation of hydrogen energy infrastructure.

[0003] The current common detection methods include mechanical detection devices directly installed on the outer wall of the pipeline and electronic monitoring systems based on gas sensing technology. The former has a simple structure but cannot remotely alarm, and the latter can realize remote monitoring but has high requirements for the environment, and may affect reliability in long-term operation due to power supply, signal transmission and other problems.

[0004] Problems existing in the prior art include:

[0005] (1) Not designed for buried working conditions, installation structure and sealing method are not applicable;

[0006] (2) Lack of effective waterproof and dustproof structure;

[0007] (3) Single function, cannot simultaneously realize on-site indication and remote alarm;

[0008] (4) Lack of redundancy design, single failure may cause the entire monitoring function to fail. SUMMARY

[0009] The present application aims to provide a leakage monitoring device for buried hydrogen pipeline to solve the problems raised in the background art.

[0010] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0011] A leakage monitoring device for buried hydrogen pipeline mainly consists of three parts: an underground gas collection unit, a ground indication unit and an electronic alarm unit. The underground gas collection unit is connected to the gas pipeline, the ground indication unit is connected to the end of the underground gas collection unit away from the gas pipeline, and the electronic alarm unit is arranged at the end of the ground indication unit away from the underground gas collection unit.

[0012] Preferably, the underground gas collection unit includes a gas collection cover and a gas guide pipe. The gas collection cover is fixed to the outer wall of the gas pipeline, the gas guide pipe is connected to the top end of the gas collection cover, the other end of the gas guide pipe is connected to the ground indication unit, and the gas collected by the gas collection cover is transported to the ground indication unit through the gas guide pipe.

[0013] The gas collecting cover adopts a split structure, is composed of an upper half cover body and a lower half fixing ring, is fixed to the outer wall of the gas conveying pipeline through split bolts, a sealing gasket is arranged at the butt joint, and a closed gas collecting cavity is formed between the upper half cover body and the gas conveying pipeline; a threaded outlet interface is arranged at the top of the upper half cover body, a flange connection mode is adopted, and a sealing gasket is arranged at the outlet interface.

[0014] Threaded rotary interfaces are arranged at the upper and lower ends of the gas guide pipe, the lower end threaded rotary interface is connected and fixed with the outlet interface of the gas collecting cover, a sealing gasket is arranged in the upper end threaded rotary interface, and the ground indication unit is connected through the upper end threaded rotary interface; and a piston is further arranged in the gas guide pipe.

[0015] Preferably, the ground indication unit comprises a transparent warning tube and a flat-top waterproof cap, and the flat-top waterproof cap is arranged at the top end of the transparent warning tube.

[0016] The lower part of the transparent warning tube is buried underground and is connected to the upper end threaded rotary interface of the gas guide pipe, and the upper part is exposed to the ground, the top of the transparent warning tube is in a semispherical shape, a float is arranged in the transparent warning tube, and upper and lower annular flanges are further arranged in the transparent warning tube, the annular flanges limit the movement range of the float in the transparent warning tube, air holes are arranged at the top, and a threaded section is arranged on the pipe body close to the top.

[0017] The flat-top waterproof cap comprises a waterproof cap body and a dust screen, the bottom of the waterproof cap body is an open port, an inner threaded joint is arranged at the inner edge of the open port, an outer threaded joint is arranged at the outer edge of the dust screen, the dust screen and the open port are detachably connected through the inner and outer threaded butt joint, an inner threaded ring is arranged at the middle of the dust screen, and the flat-top waterproof cap is fixedly connected to the threaded section of the transparent warning tube through the inner threaded ring of the middle of the dust screen.

[0018] Preferably, the electronic alarm unit comprises a hydrogen concentration detection sensor and a remote monitoring terminal, the hydrogen concentration detection sensor is arranged on the inner wall of the top of the transparent warning tube, and the hydrogen concentration detection sensor and the remote monitoring terminal are connected through wireless communication.

[0019] Preferably, the gas collecting cover and the split bolts are made of stainless steel, the sealing gasket is made of polytetrafluoroethylene, the gas guide pipe is made of flexible stainless steel corrugated pipe, and the piston is made of low-density polyethylene.

[0020] Preferably, the transparent warning tube is made of high-strength transparent polycarbonate material, the waterproof cap body is made of transparent acrylic material, and the dust screen is made of anti-static treated nylon screen.

[0021] Preferably, the buoy is made of low-density composite material, and its surface is coated with high-visibility fluorescent paint, and its density is between that of air and hydrogen.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] (1) The buried installation structure is suitable for underground environment requirements; (2) The combination of mechanical and electronic detection advantages provides on-site indication and remote alarm functions, and has high reliability; (3) The redundant design does not affect the normal work of another system in case of single system failure;

[0024] (4) The gas leakage hole and dust screen design prevent gas accumulation in the device, improving safety performance; (5) The waterproof cap and dust screen design improves environmental adaptability; (6) The knob-type dust screen makes the replacement of the filter assembly simple and fast. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a leakage monitoring device for a buried hydrogen pipeline;

[0026] Figure 2 Fig. 2 is a sectional view of the main body of a leakage monitoring device for a buried hydrogen pipeline;

[0027] Figure 3 Fig. 3 is an enlarged view of the flat-top waterproof cap portion of a leakage monitoring device for a buried hydrogen pipeline;

[0028] Figure 4 Fig. 4 is a sectional view of the gas guide tube portion of a leakage monitoring device for a buried hydrogen pipeline;

[0029] Figure 5 Fig. 5 is a sectional view of the transparent warning tube portion of a leakage monitoring device for a buried hydrogen pipeline.

[0030] The reference signs in the drawings of the specification include:

[0031] 1. Underground gas collection unit; 101. Gas collection hood; 101a. Upper half of the hood; 101b. Lower half of the fixing ring; 101c. Split bolt; 101d. Sealing gasket; 101e. Sealed gas collection chamber; 101f. Outlet interface; 101g. Sealing gasket; 102. Gas guide pipe; 102a. Twist interface; 102b. Piston; 2. Ground indicating unit; 201. Transparent warning tube; 201a. Top; 201 b. Buoy; 201c. Annular flange; 201d. Vent hole; 201e. External thread section; 202. Flat-top waterproof cap; 202a. Waterproof cap body; 202b. Dustproof net; 202c. Opening; 202d. Internal threaded joint; 202e. External threaded joint; 202f. Internal threaded ring; 3. Electronic alarm unit; 301. Hydrogen concentration detection sensor; 302. Remote monitoring terminal; 4. Gas transmission pipeline. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0033] like Figures 1-5 As shown, a leak monitoring device for buried hydrogen pipelines mainly consists of three parts: an underground gas collection unit 1, a ground indicator unit 2, and an electronic alarm unit 3. The underground gas collection unit 1 is connected to the gas transmission pipeline 4, the ground indicator unit 2 is connected to the end of the underground gas collection unit 1 away from the gas transmission pipeline 4, and the electronic alarm unit 3 is located at the end of the ground indicator unit 2 away from the underground gas collection unit 1.

[0034] The underground gas collection unit 1 includes a gas collection hood 101 and a gas guide pipe 102. The gas collection hood 101 is fixed to the outer wall of the gas transmission pipeline 4. The gas guide pipe 102 is connected to the top of the gas collection hood 101. The other end of the gas guide pipe 102 is connected to the ground indicator unit 2. The gas collected by the gas collection hood 101 is transported to the ground indicator unit 2 through the gas guide pipe 102.

[0035] The gas collection hood 101 adopts a split structure, consisting of an upper half hood 101a and a lower half fixing ring 101b. It is fixed to the outer wall of the gas transmission pipeline 4 by split bolts 101c. A sealing gasket 101d is provided at the joint, forming a sealed gas collection chamber 101e between it and the pipeline. The top 201a of the upper half hood 101a is provided with an outlet interface 101f with internal threads, which is connected by a flange. A sealing gasket 101g is installed at the outlet interface 101f.

[0036] The upper and lower ends of the gas guide pipe 102 are provided with external thread screw joints 102a, the lower end screw joint 102a is connected and fixed with the outlet joint 101f of the gas collecting cover 101, the upper end screw joint 102a is internally provided with a sealing gasket 101d, and the ground indication unit 2 is connected through the upper end screw joint 102a; the gas guide pipe 102 is internally provided with a piston 102b, and the hydrogen gas pushes the piston 102b to move upward after entering the gas guide pipe 102.

[0037] Among them, the gas collecting cover 101 and the split bolt 101c are made of stainless steel, the sealing gasket 101d is made of polytetrafluoroethylene, the gas guide pipe 102 is made of flexible stainless steel corrugated pipe, and the piston 102b is made of low-density polyethylene.

[0038] The ground indication unit 2 comprises a transparent warning pipe 201 and a flat-top waterproof cap 202, and the flat-top waterproof cap 202 is installed at the top end of the transparent warning pipe 201.

[0039] The lower part of the transparent warning pipe 201 is buried underground and is connected to the upper end screw joint 102a of the gas guide pipe 102, the upper part is exposed to the ground, the top 201a is hemispherical, the transparent warning pipe 201 is internally provided with a float 201b and two layers of annular flanges 201c, the annular flanges 201c limit the movement range of the float 201b in the transparent warning pipe 201; in order to prevent hydrogen accumulation, the hemispherical top 201a is provided with a gas vent 201d, and the transparent warning pipe 201 is provided with an external thread section 201e on the pipe body near the top 201a.

[0040] The flat-top waterproof cap 202 comprises a waterproof cap body 202a and a dust screen 202b, the bottom of the waterproof cap body 202a is an open port 202c, the inner edge of the open port 202c is provided with an internal thread joint 202d, the outer edge of the dust screen 202b is provided with an external thread joint 202e, and the two are connected in a detachable manner through the internal and external thread joints, the middle of the dust screen 202b is provided with an internal thread ring 202f, and the flat-top waterproof cap 202 is fixedly connected to the external thread section 201e of the transparent warning pipe 201 through the internal thread ring 202f in the middle of the dust screen 202b.

[0041] Among them, the transparent warning pipe 201 is made of high-strength transparent polycarbonate material, the waterproof cap body 202a is made of transparent acrylic material, the float 201b is made of low-density composite material and has a high-visibility fluorescent coating on the surface, and the density of the float 201b is between that of air and hydrogen, and the dust screen 202b is made of anti-static nylon mesh.

[0042] The electronic alarm unit 3 comprises a hydrogen concentration detection sensor 301 and a remote monitoring terminal 302; the hydrogen concentration detection sensor 301 is installed on the inner wall of the top 201a of the transparent warning tube 201, and the hydrogen concentration detection sensor 301 and the remote monitoring terminal 302 are connected through wireless communication mode.

[0043] The specific implementation process is as follows:

[0044] The device is based on the gas density difference principle and sensing detection technology to realize leakage monitoring. When the gas pipeline 4 leaks, hydrogen leaks into the closed gas collection cavity 101e formed by the gas collection cover 101 through the pipeline wall. Since the density of hydrogen is less than that of air, it gradually accumulates and rises in the gas collection cavity, pushes the piston 102b to move through the gas guide pipe 102, and enters the bottom of the transparent warning tube 201 of the ground indication unit 2;

[0045] In the pipe body of the transparent warning tube 201, hydrogen accumulates at the bottom to form an air cushion, generating buoyancy. When the buoyancy is greater than the weight of the buoy 201b itself, the buoy 201b starts to move upwards along the pipe body of the transparent warning tube 201, gradually rising from the bottom of the transparent warning tube 201 to the upper part exposed to the ground, and realizing visual leakage indication through the change of its bright color and position;

[0046] The gas at the top 201a of the transparent warning tube 201 can ensure that the gas does not accumulate in the device through the air vent 201d, and the hydrogen is discharged from the device through the dust screen 202b, and the entry of insects and dust is effectively prevented;

[0047] At the same time, the electronic alarm unit 3 monitors the hydrogen concentration in real time. When the hydrogen concentration detection sensor 301 detects that the concentration exceeds the set threshold, it immediately sends an alarm signal to the remote monitoring terminal 302 through wireless transmission, and the monitoring personnel can know the leakage situation in time and take corresponding measures.

[0048] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

Claims

1. A leak monitoring device for buried hydrogen pipelines, characterized in that: The device mainly consists of three parts: an underground gas collection unit (1), a ground indicator unit (2), and an electronic alarm unit (3). The underground gas collection unit (1) is connected to the gas transmission pipeline (4). The ground indicator unit (2) is connected to the end of the underground gas collection unit (1) away from the gas transmission pipeline (4). The electronic alarm unit (3) is located at the end of the ground indicator unit (2) away from the underground gas collection unit (1).

2. The leakage monitoring device for buried hydrogen pipelines according to claim 1, characterized in that: The underground gas collection unit (1) includes a gas collection hood (101) and a gas guide pipe (102). The gas collection hood (101) is fixed on the outer wall of the gas transmission pipeline (4). The gas guide pipe (102) is connected to the top of the gas collection hood (101). The other end of the gas guide pipe (102) is connected to the ground indicator unit (2). The gas collected by the gas collection hood (101) is transported to the ground indicator unit (2) through the gas guide pipe (102). The gas collection hood (101) adopts a split structure, consisting of an upper half hood (101a) and a lower half fixing ring (101b), which is fixed to the outer wall of the gas transmission pipe (4) by split bolts (101c). A sealing gasket (101d) is provided at the joint. A sealed gas collection chamber (101e) is formed between the upper half hood (101a) and the gas transmission pipe (4). The top (201a) of the upper half hood (101a) is provided with an outlet interface (101f) with internal threads, which is connected by a flange. A sealing gasket (101g) is installed at the outlet interface (101f). The air duct (102) is provided with externally threaded rotary interfaces (102a) at both ends. The lower rotary interface (102a) is connected and fixed to the outlet interface (101f) of the air collection hood (101). A sealing gasket (101d) is installed inside the upper rotary interface (102a). The ground indicator unit (2) is connected through the upper rotary interface (102a). A piston (102b) is also provided inside the air duct (102).

3. A leakage monitoring device for buried hydrogen pipelines according to claim 1, characterized in that: The ground indicator unit (2) includes a transparent warning tube (201) and a flat-top waterproof cap (202), wherein the flat-top waterproof cap (202) is installed on the top of the transparent warning tube (201); The lower part of the transparent warning tube (201) is buried underground and connected to the upper end of the vent pipe (102) via a rotary interface (102a). The upper part is exposed above the ground. The top (201a) of the transparent warning tube (201) is hemispherical. A buoy (201b) is installed inside the transparent warning tube (201), and two layers of annular flanges (201c) are also installed inside. The annular flanges restrict the range of movement of the buoy (201b) inside the transparent warning tube (201). The top (201a) is provided with a vent hole (201d), and the transparent warning tube (201) has an external thread section (201e) on the tube body near the top (201a). The flat-top waterproof cap (202) includes a waterproof cap body (202a) and a dustproof net (202b). The bottom of the waterproof cap body (202a) is an open opening (202c). An internal threaded connector (202d) is provided at the inner edge of the open opening (202c). An external threaded connector (202e) is provided at the outer edge of the dustproof net (202b). The dustproof net (202b) and the open opening (202c) are connected in a detachable manner by the mating of internal and external threads. An internal threaded ring (202f) is provided in the middle of the dustproof net (202b). The flat-top waterproof cap (202) is fixedly connected to the external threaded section (201e) of the transparent warning tube (201) by mating the internal threaded ring (202f) in the middle of the dustproof net (202b).

4. A leakage monitoring device for buried hydrogen pipelines according to claim 1, characterized in that: The electronic alarm unit (3) includes a hydrogen concentration detection sensor (301) and a remote monitoring terminal (302); the hydrogen concentration detection sensor (301) is installed on the inner wall of the top (201a) of the transparent warning tube (201), and the hydrogen concentration detection sensor (301) and the remote monitoring terminal (302) are connected by wireless communication.

5. A leakage monitoring device for buried hydrogen pipelines according to claim 2, characterized in that: The gas collection hood (101) and the split bolt (101c) are made of stainless steel, the sealing gasket (101d) is made of polytetrafluoroethylene, the gas guide pipe (102) is made of flexible stainless steel bellows, and the piston (102b) is made of low-density polyethylene.

6. A leakage monitoring device for buried hydrogen pipelines according to claim 3, characterized in that: The transparent warning tube (201) is made of high-strength transparent polycarbonate material, the waterproof cap body (202a) is made of transparent acrylic material, and the dustproof net (202b) is made of anti-static treated nylon net.

7. A leakage monitoring device for buried hydrogen pipelines according to claim 3, characterized in that: The buoy (201b) is made of a low-density composite material with a high-visibility fluorescent coating on its surface and a density between that of air and hydrogen.

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