Connecting assembly, system and method for hydrogen alarm

Abstract

The invention provides a connecting assembly, system and method for hydrogen alarm. The connecting assembly for hydrogen alarm comprises a cooling device and a connector structure, the cooling device comprises a shell and a cooling pipe, the shell is provided with a hollow space, and the cooling pipe is coaxially arranged in the hollow space; the joint structure comprises a hollow cavity and a sealing cover, the joint structure is coaxially arranged at the upper part of the shell, and the hollow cavity is communicated with the hollow space; the sealing cover is arranged at the top of the hollow cavity, at least two cooling holes are formed in the sealing cover, and an inlet and an outlet of the cooling pipe are connected with the two cooling holes in a sealed mode respectively; a plurality of exhaust holes which are uniformly distributed in the radius direction are formed in the side wall of the hollow cavity, and an open hole is formed in the center of the sealing cover and used for being connected with a hydrogen alarm detector in a sealed mode. The hydrogen alarm system comprises a connecting assembly for hydrogen alarm and a hydrogen alarm detector. The hydrogen alarm system is high in detection performance, high in safety and long in service life.

Description

Technical Field

[0001] The present invention specifically relates to a connection assembly, system and method for hydrogen alarm. Background Art

[0002] Hydrogen energy is rising strongly as a strategic energy source. The use of renewable energy to produce hydrogen is a key development direction. Among them, the electrolysis of water to produce hydrogen is the main technical means to achieve hydrogen production from renewable energy. Electric energy decomposes water into oxygen and hydrogen through the stack. The positive electrode produces oxygen and the negative electrode produces hydrogen. Due to the possibility of internal leakage in the stack, the negative electrode hydrogen may be injected into the positive electrode oxygen. When the hydrogen exceeds the warning value, there is a risk of explosion. To ensure safety, it is necessary to detect the hydrogen concentration of the positive electrode circulation system. When the positive electrode hydrogen concentration increases and exceeds the warning value, random maintenance work is carried out; if the hydrogen concentration detection fails, the hydrogen concentration will be misjudged, and in the worst case, it will cause an explosion risk. Since the hydrogen alarm is installed on the water tank of the positive circulation system, the positive circulation includes water circulation and oxygen discharge, the water temperature can be as high as 80°C. There is a large amount of steam and splashing liquid water in the water tank. If the hydrogen alarm is installed directly on the circulating water tank, the alarm probe will fail too quickly due to being in the steam and liquid water environment for a long time. If it is not replaced in time, the hydrogen concentration detection will fail, which will lead to dangerous events.

[0003] To solve the above problems, a specific connector is used to connect the hydrogen alarm and the water tank. The connector needs to have the following functions: first, the connector must have a certain strength, not easy to damage, and be of moderate size and easy to integrate; second, the gas in the connector is connected to the gas in the water tank, and there is a flow effect to avoid dead zones, ensuring that the gas in the connector is always the same as the gas in the water tank, thereby ensuring that the hydrogen concentration in the connector is the same as the hydrogen concentration in the water tank; third, after the gas passes through the connector to reach the hydrogen alarm probe, the moisture content must be greatly reduced, with the alarm probe not producing liquid water as the standard. After adding the above connector, the hydrogen alarm probe will not be covered by liquid water for a long time. On the one hand, it can ensure the accuracy of the detection data, and on the other hand, the probe is protected from corrosion and the service life is extended.

[0004] Currently, there is no connector in the market that meets the above requirements, so the connector needs to be specifically designed according to functional requirements. Summary of the invention

[0005] In order to overcome the technical defects of hydrogen alarm in the prior art, such as detection failure and safety problems, the present invention provides a connection assembly, system and method for hydrogen alarm. The hydrogen alarm system of the present invention has high detection performance, high safety and long service life.

[0006] A connection assembly for hydrogen alarm, comprising a cooling device and a joint structure, wherein the cooling device comprises a shell and a cooling pipe, the shell has a hollow space, and the cooling pipe is coaxially arranged in the hollow space;

[0007] The joint structure comprises a hollow cavity and a cover, and the joint structure is coaxially arranged on the upper part of the shell and enables the hollow cavity to communicate with the hollow space;

[0008] The cover is arranged on the top of the hollow cavity, and at least two cooling holes are arranged on the cover, and the inlet and the outlet of the cooling pipe are respectively sealed and connected with the two cooling holes;

[0009] The side wall of the hollow cavity is provided with a plurality of exhaust holes evenly distributed along the radial direction, and the center of the cover is provided with an opening for sealing connection with the hydrogen alarm detector.

[0010] In the present invention, preferably, the ratio of the sum of the cross-sectional areas of the plurality of exhaust holes to the axial cross-sectional area of ​​the hollow space of the shell is (0.8-1.1), for example, 0.92. The present invention provides exhaust holes to connect the gas in the water tank with the external atmosphere, so that the gas in the hydrogen alarm connection assembly can flow, thereby ensuring the consistency between the gas measured by the hydrogen alarm connection assembly and the gas in the water tank, and the lateral openings prevent dust particles from entering the water tank in the direction of gravity.

[0011] In the present invention, preferably, the ratio of the diameter of the hollow cavity to the diameter of the shell is 1.8-2.4, for example, 2.0.

[0012] In the present invention, the diameter of the exhaust hole is preferably 4-6 mm, such as 4 mm, 5 mm or 6 mm;

[0013] In the present invention, preferably, the exhaust hole is arranged at (1 / 2-3 / 4)D of the hollow cavity, where D is the height of the hollow cavity.

[0014] In the present invention, preferably, the housing is a tubular housing; the tubular housing is preferably a chuck-type straight tube;

[0015] In the present invention, the diameter of the shell is preferably 25-51 mm, for example, 32 mm, 38 mm or 45 mm.

[0016] In the present invention, the length of the housing is preferably 200-300 mm, for example 200 mm. The length of the housing should not be too long, otherwise the height of the complete set of equipment will be too high, which is not conducive to system design.

[0017] In the present invention, the material of the shell is preferably stainless steel.

[0018] In the present invention, the diameter of the hollow cavity is preferably 50-100 mm, for example, 60 mm, 80 mm or 90 mm;

[0019] In the present invention, the height of the hollow cavity is preferably 20-40 mm, for example 30 mm;

[0020] In the present invention, the material of the joint structure is preferably one of SUS316L stainless steel, PP, PE, PVC and ABS.

[0021] In the present invention, the hollow cavity and the shell are preferably connected in an integrated manner or by welding.

[0022] In the present invention, preferably, the cooling tube is a spiral cooling tube, and the shape of the spiral cooling tube is preferably a standard shape, a triangle or a sinusoidal shape;

[0023] In the present invention, the diameter of the cooling tube is preferably 6-9 mm, such as 7 mm, 8 mm or 9 mm.

[0024] In the present invention, the pitch of the cooling tube is preferably 10-20 mm, such as 15 mm.

[0025] In the present invention, the cooling tube is preferably made of stainless steel.

[0026] In the present invention, preferably, the sealing cover is connected to the hollow cavity through threads.

[0027] The present invention provides a hydrogen alarm system, which comprises the above-mentioned connecting assembly for hydrogen alarm and a hydrogen alarm detector, wherein the connecting assembly for hydrogen alarm is connected to the hydrogen alarm detector through the opening of the cover.

[0028] The present invention provides a hydrogen alarm method, which uses the above-mentioned hydrogen alarm connection assembly and hydrogen alarm detector, and comprises the following steps:

[0029] S1, the gas to be tested flows through the hollow space of the shell, the cooling tube cools the gas to be tested, so that the gaseous water in the gas to be tested turns into liquid water, the liquid water flows back along the inner wall of the shell and the outer wall of the cooling tube, and the remaining gas to be tested enters the hollow cavity;

[0030] S2, part of the gas to be tested that enters the hollow cavity is discharged through the exhaust hole, so that no gas dead zone is formed in the hollow cavity,

[0031] At the same time, another part of the gas to be tested that enters the hollow cavity reaches the hydrogen alarm detector, and the hydrogen alarm detector is used to monitor the hydrogen concentration in the gas.

[0032] The present invention can greatly improve the reliability of the device by coaxially arranging the cooling pipe in the hollow space, because there is no welding point, and avoids the cooling water breaking through the welding point and entering the water tank to pollute the water quality. When designing the shell length, diameter and shape of the cold water pipe, the present invention needs to take into account the gas passage resistance and cooling effect. If the gas passage resistance is too large, it will affect the consistency of the hydrogen components of the hollow cavity gas and the gas in the water tank. If the cooling effect is not good, condensation will form on the probe of the hydrogen alarm detector.

[0033] The diameter and length of the housing and the cooling tube of the present invention can be determined by fluid simulation and experimental verification. The shape and heat exchange area of ​​the cooling tube can be determined by fluid simulation and experimental verification.

[0034] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0035] The reagents and raw materials used in the present invention are commercially available.

[0036] The positive and progressive effects of the present invention are:

[0037] The connection assembly for hydrogen alarm of the present invention can make the high-temperature and high-humidity gas in the water tank flow through the cooling device under the impetus of oxygen generated by the anode. Under the action of the cooling pipe, the gas is cooled and the dew point is reduced to room temperature. The gaseous water turns into liquid water and flows back to the water tank along the inner wall of the tubular shell and the outer wall of the cooling water pipe. The gas flowing upward reaches the joint chamber. The probe of the hydrogen alarm in the chamber is close to room temperature, so no liquid water will be formed on the probe, thereby achieving the purpose of protecting the probe; the gas reaching the chamber continues to be discharged into the environment through the exhaust hole on the side wall of the hollow cavity, so no gas dead zone will be formed in the chamber to avoid erroneous monitoring. At the same time, the exhaust hole avoids the pollution of water quality caused by dust particles entering the water tank through the connection assembly for hydrogen alarm in the direction of gravity.

[0038] The connection assembly for hydrogen alarm of the present invention can adapt to the working temperature of 40-65°C. When it is in the working condition of 60°C, the H2 concentration deviation of the present invention is 25%. In addition, those skilled in the art know that the water in the gas in the water tank will be condensed as the gas in the water tank rises from the shell to the hollow cavity, and the concentration of hydrogen will rise. Therefore, the concentration of hydrogen reaching the probe of the hydrogen alarm detector will be higher than the concentration of hydrogen in the gas in the water tank, which will not cause danger. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1This is a schematic structural diagram of the shell of Example 1.

[0040] Figure 2 Three different shapes of cooling tubes of the present invention are shown.

[0041] Figure 3 It is a structural schematic diagram and an exploded diagram of the joint structure of Example 1.

[0042] Figure 4 This is the connection diagram of the hydrogen alarm system of Comparative Example 1.

[0043] Figure 5 This is the connection diagram of the hydrogen alarm system of Comparative Example 2.

[0044] Figure 6 3D diagram and cross-sectional view of the connection assembly of Example 1.

[0045] Figure 7 This is a steady-state simulation diagram of the gas fluid in the connection assembly of Example 1.

[0046] Figure 8 This is a connection diagram of the hydrogen alarm system of Example 1.

[0047] Description of reference numerals:

[0048] Cooling device 1

[0049] Housing 11

[0050] Cooling pipe 12

[0051] Joint structure 2

[0052] Hollow cavity 21

[0053] Exhaust hole 22

[0054] Cap 23

[0055] Cooling holes 24

[0056] Opening 25

[0057] Hydrogen alarm detector 3

[0058] Battery stack 4

[0059] Water tank 5

[0060] Circulation pump 6 DETAILED DESCRIPTION

[0061] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product instructions.

[0062] Example 1

[0063] This embodiment 1 provides a connection assembly for hydrogen alarm, which includes a cooling device 1 and a joint structure 2. The cooling device 1 includes a shell 11 and a cooling pipe 12. The shell 11 has a hollow space, such as Figure 1 As shown, the cooling pipe 12 is coaxially arranged in the hollow space; the joint structure 2 includes a hollow cavity 21 and a cover 23, as shown in FIG. Figure 3 As shown, the cover 23 is connected to the hollow cavity 21 through a thread, and the joint structure 2 is coaxially arranged on the upper part of the shell 11, and the hollow cavity 21 is connected to the hollow space; the cover 23 is arranged on the top of the hollow cavity 21, and at least two cooling holes 24 are arranged on the cover 23, and the inlet and outlet of the cooling pipe 12 are sealed and connected to the two cooling holes 24 respectively; 36 exhaust holes 22 are evenly distributed along the radial direction on the side wall of the hollow cavity 21, and the ratio of the total area of ​​the 36 exhaust holes 22 to the axial cross-sectional area of ​​the hollow space of the shell 11 is 0.92; an opening 25 is arranged at the center of the cover 23 for sealing connection with the hydrogen alarm detector 3.

[0064] The ratio of the diameter of the hollow cavity 21 to the diameter of the housing 11 is 2.1.

[0065] The exhaust hole 22 is disposed at (1 / 2-3 / 4)D of the hollow cavity 21 , where D is the height of the hollow cavity 21 .

[0066] The housing 11 is a tubular housing 11 of a chuck-type straight tube, and the material of the housing 11 is stainless steel.

[0067] The hollow cavity 21 and the housing 11 are integrally connected. The cooling tube 12 is made of stainless steel. The cooling tube 12 is a spiral cooling tube 12, and the shape of the spiral cooling tube 12 can be a standard shape, a triangle or a sine shape, such as Figure 2 In this embodiment 1, a sinusoidal spiral cooling pipe 12 is selected, and the sinusoidal period is 1.5 periods, which can be calculated based on the diameter of the shell 11, the length of the shell 11, the diameter of the cold water pipe and the pitch of the cold water pipe, so that the cooling water pipe is within the length range of the shell.

[0068] Figure 6 The three-dimensional diagram and cross-sectional view of the connection components for hydrogen alarm.

[0069] The diameter and height of the hollow cavity 21, the diameter and length of the shell 11, the shape, tube diameter and pitch of the cooling tube 12, and the diameter and number of the air holes are shown in Table 1.

[0070] Table 1 Parameter values ​​of the connection components for hydrogen alarm

[0071]

[0072] All parts of the hydrogen alarm connection assembly are made of SUS316L stainless steel.

[0073] This embodiment 1 provides a hydrogen alarm system, which includes the above-mentioned hydrogen alarm connection assembly and hydrogen alarm detector 3, and the hydrogen alarm connection assembly is connected to the hydrogen alarm detector 3 through the opening 25 of the cover 23. The hydrogen alarm detector 3 is a hydrogen alarm, whose brand model is GT-1000, and the thread specification is determined according to the actual object.

[0074] This embodiment 1 provides a hydrogen alarm method, which adopts the above hydrogen alarm system, integrates the hydrogen alarm connection component and the hydrogen alarm detector 3, the water tank 5, the circulation pump 6, and the battery stack 4 together, such as Figure 8 As shown, the power of the battery stack 4 is 5kW and the volume of the water tank 5 is 20L.

[0075] The hydrogen alarm method includes the following steps:

[0076] S1, the gas to be tested flows through the hollow space of the shell 11, and the cooling tube 12 cools the gas to be tested, so that the gaseous water in the gas to be tested turns into liquid water, and the liquid water flows back along the inner wall of the shell 11 and the outer wall of the cooling tube 12, and the remaining gas to be tested enters the hollow cavity 21;

[0077] S2, part of the gas to be tested that enters the hollow cavity 21 is discharged through the exhaust hole 22, so that no gas dead zone is formed in the hollow cavity 21,

[0078] At the same time, another part of the gas to be tested that enters the hollow cavity 21 reaches the hydrogen alarm detector 3, which is used to monitor the hydrogen concentration in the gas.

[0079] The steady-state simulation diagram of the gas flow in the hydrogen alarm connection assembly of Example 1 is as follows: Figure 7 shown.

[0080] The operating temperature of the system is 60°C. After running continuously for 10 hours, the condensation at the hydrogen alarm probe was checked and no liquid water was found. The hydrogen concentration reaching the hydrogen alarm probe was higher than the hydrogen concentration in the gas in the water tank 5, and its H2 concentration deviation was 25%. The hydrogen alarm system achieved its intended purpose.

[0081] Comparative Example 1

[0082] The difference between the connection assembly for hydrogen alarm of Comparative Example 1 and Example 1 is that it does not include the joint structure 2, and the cooling device 1 does not include the cooling pipe 12.

[0083] like Figure 4As shown, the hydrogen alarm connection assembly, hydrogen alarm detector 3, water tank 5, circulation pump 6 and battery stack 4 are integrated together. The battery stack 4 has a power of 5kW and the water tank 5 has a volume of 20L. The hydrogen alarm detector 3 is a hydrogen alarm of brand model GT-1000.

[0084] The operating temperature of the system is 60°C. After the system has been running continuously for 10 hours, the condensation at the hydrogen alarm probe was checked and it was found that the hydrogen alarm probe was completely soaked in liquid water. If this working state continues for a long time, the probe will be corroded by water. If it is not replaced in time, it will cause erroneous monitoring and lead to accidents.

[0085] Comparative Example 2

[0086] The difference between the hydrogen alarm connection assembly of comparative example 2 and embodiment 1 is that the side wall of the hollow cavity 21 of the joint structure 2 is not provided with an exhaust hole 22 .

[0087] like Figure 5 As shown, the hydrogen alarm connection assembly, hydrogen alarm, water tank 5, circulation pump 6, and battery stack 4 are integrated together, wherein all the connector parts are made of SUS316L stainless steel, the battery stack 4 has a power of 5kW, the water tank 5 has a volume of 20L, and the hydrogen alarm detector 3 selects a hydrogen alarm of brand model GT-1000. The operating temperature of the system is 60°C. After the system has been running continuously for 10 hours, the condensation at the hydrogen alarm probe is checked, and it is found that there is no liquid water at the hydrogen alarm probe, but the gas in the tubular shell 11 cannot flow, and there is a difference between the gas in the chamber and the water tank 5. Since the hydrogen alarm connection assembly of Comparative Example 2 does not have an exhaust hole, the gas in the tube does not circulate, forming a dead zone, and cannot timely and truly reflect the hydrogen concentration value in the water tank. Therefore, the hydrogen alarm monitoring value cannot reflect the actual concentration in the water tank 5, and the monitoring is invalid.

Claims

1. A connection assembly for hydrogen alarm, characterized in that: It comprises a cooling device and a joint structure, wherein the cooling device comprises a shell and a cooling pipe, wherein the shell has a hollow space, and the cooling pipe is coaxially arranged in the hollow space; The joint structure comprises a hollow cavity and a cover, and the joint structure is coaxially arranged on the upper part of the shell and enables the hollow cavity to communicate with the hollow space; The cover is arranged on the top of the hollow cavity, and at least two cooling holes are arranged on the cover, and the inlet and the outlet of the cooling pipe are respectively sealed and connected with the two cooling holes; The side wall of the hollow cavity is provided with a plurality of exhaust holes evenly distributed along the radial direction; An opening is provided at the center of the sealing cover for sealing connection with a hydrogen alarm detector.

2. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The ratio of the sum of the cross-sectional areas of the plurality of exhaust holes to the axial cross-sectional area of ​​the hollow space of the shell is (0.8-1.1), for example, 0.

92.

3. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The ratio of the diameter of the hollow cavity to the diameter of the shell is 1.8-2.4, for example, 2.

1.

4. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The diameter of the exhaust hole is 4-6 mm, for example 4 mm, 5 mm or 6 mm; And / or, the exhaust hole is arranged at (1 / 2-3 / 4)D of the hollow cavity, where D is the height of the hollow cavity.

5. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The housing is a tubular housing; the tubular housing is preferably a chuck-type straight tube; And / or, the diameter of the housing is 25-51 mm, for example, 32 mm, 38 mm or 45 mm; And / or, the length of the housing is 200-300 mm, for example 200 mm; And / or, the shell is made of stainless steel.

6. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The diameter of the hollow cavity is 50-100 mm, for example, 60 mm, 80 mm or 90 mm; And / or, the height of the hollow cavity is 20-40 mm, for example 30 mm; And / or, the material of the joint structure is SUS316L stainless steel, PP, PE, PVC and ABS One of; And / or, the hollow cavity and the shell are integrally connected or welded.

7. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The cooling tube is a spiral cooling tube, and the shape of the spiral cooling tube is preferably a standard shape, a triangle or a sinusoidal shape; And / or, the cooling tube has a diameter of 6-9 mm, such as 7 mm, 8 mm or 9 mm; And / or, the pitch of the cooling tube is 10-20 mm, for example 15 mm; And / or, the cooling tube is made of stainless steel.

8. The connection assembly for hydrogen alarm according to claim 1, characterized in that: The sealing cover is connected to the hollow cavity through threads.

9. A hydrogen alarm system, characterized in that: It comprises a hydrogen alarm connection assembly and a hydrogen alarm detector as described in any one of claims 1 to 8, wherein the hydrogen alarm connection assembly is connected to the hydrogen alarm detector through the opening of the cover.

10. A hydrogen alarm method, characterized in that: The method uses the hydrogen alarm connection assembly and hydrogen alarm detector as described in any one of claims 1 to 8, and comprises the following steps: S1, the gas to be tested flows through the hollow space of the shell, the cooling tube cools the gas to be tested, so that the gaseous water in the gas to be tested turns into liquid water, the liquid water flows back along the inner wall of the shell and the outer wall of the cooling tube, and the remaining gas to be tested enters the hollow cavity; S2. The part of the gas to be tested that enters the hollow cavity is discharged through the exhaust hole, so that no gas dead zone is formed in the hollow cavity; At the same time, another part of the gas to be tested that enters the hollow cavity reaches the hydrogen alarm detector, and the hydrogen alarm detector is used to monitor the hydrogen concentration in the gas.

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