Explosion-proof junction box, hydrogen drying device and water electrolysis system for hydrogen purification

Abstract

The present disclosure relates to an explosion-proof junction box for hydrogen purification, a hydrogen drying device and a hydrogen purification technology field of an electrolytic water system, and belongs to the field of hydrogen purification. The explosion-proof junction box for hydrogen purification includes a box body, wherein the box body has a first cavity for accommodating the wiring part of the electric heating tube, and the side wall of the first cavity is provided with a cable access port and a protective gas access port connected to the interior thereof. An isolation layer is provided at the bottom of the first cavity, and a through hole for the electric heating tube to pass through is formed on the isolation layer, and a sealing assembly is provided on the through hole, and the sealing assembly is used to seal the surrounding of the electric heating tube. The present disclosure solves the problem that hydrogen leakage in the related art may cause safety failures.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydrogen purification, and in particular to an explosion-proof junction box, a hydrogen drying device and a water electrolysis system for hydrogen purification. Background Art

[0002] As an important chemical raw material and energy source, hydrogen is widely used in various fields of the national economy. However, due to the characteristics of hydrogen such as easy leakage, low ignition energy, and wide explosion range, it is very important to ensure the safe production of hydrogen. In industrial production, hydrogen purification equipment is often used to prepare high-purity hydrogen.

[0003] Due to the flammable and explosive characteristics of hydrogen, in actual production, hydrogen purification systems are prone to explosion accidents. Usually, a hydrogen purification system consists of two or three drying devices connected in parallel, one or two of which are used to dry and dehumidify the hydrogen, while the other drying device is used to regenerate the desiccant. Figure 1 ) When drying and dehumidifying hydrogen, a straight tube electric heating tube is usually inserted into a sleeve for use, and the sleeve is fixed to the drying tower by welding. Specifically, the opening of the sleeve is fixed to the drying tower by welding. The consequence of this is that there will be a gap at the connection between the opening of the sleeve and the drying tower after welding. Once hydrogen leaks through this gap into the junction box above, it will cause a safety failure. Summary of the invention

[0004] The present disclosure provides an explosion-proof junction box, a hydrogen drying device and a water electrolysis system for hydrogen purification, which solve the problem that hydrogen leakage may cause safety failures in the related art.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides an explosion-proof junction box for hydrogen purification, comprising a box body, wherein the box body has a first cavity for accommodating the wiring part of the electric heating tube, and the side wall of the first cavity is provided with a cable access port and a protective gas access port connected to the interior thereof.

[0006] An isolation layer is provided at the bottom of the first cavity, a through hole is formed on the isolation layer for the electric heating tube to pass through, and a sealing component is provided on the through hole, and the sealing component is used to seal the gap around the electric heating tube.

[0007] Optionally, the sealing assembly includes a sealing member and a socket for the electric heating tube to pass through, the socket is installed in the through hole, and the sealing member is tightly connected to the socket.

[0008] Optionally, a second cavity is further provided in the box body, and the second cavity is located below the first cavity; a first sleeve is provided in the second cavity and penetrates the second cavity from top to bottom, and the first sleeve is connected to the through hole.

[0009] Optionally, an exhaust hole is provided on the side wall of the box body, and the exhaust hole is connected to the interior of the second cavity; and the side wall of the first sleeve is hollow.

[0010] Optionally, a reserved hole is further provided on the side wall of the box body, and the reserved hole is communicated with the interior of the second cavity, wherein the reserved hole is used for purging protective gas.

[0011] Optionally, the exhaust hole and the reserved hole are respectively and correspondingly arranged on opposite side walls of the box body.

[0012] Optionally, there are multiple first sleeves, which are distributed at intervals.

[0013] The present disclosure also provides a hydrogen drying device, comprising a drying tower, an electric heating tube and the aforementioned explosion-proof junction box for hydrogen purification, wherein the drying tower is arranged below the explosion-proof junction box for hydrogen purification, a second sleeve is arranged in the drying tower, and the electric heating tube is arranged in the second sleeve through the sealing assembly; a hydrogen inlet and a hydrogen outlet are arranged on the side wall of the drying tower, and a molecular sieve desiccant is also placed in the drying tower.

[0014] Optionally, an inner barrel is provided in the drying tower, the hydrogen inlet is connected to the inner barrel, the second sleeve is arranged in the inner barrel, a sieve plate is provided at the bottom of the inner barrel, and the sieve plate is connected to the inner wall of the drying tower.

[0015] The present disclosure also provides a water electrolysis system, including a hydrogen purification system, wherein the hydrogen purification system includes the aforementioned hydrogen drying device.

[0016] Compared with the related art, the present invention has the following advantages:

[0017] By setting an isolation layer at the bottom of the first cavity, forming a through hole for the electric heating tube to pass through on the isolation layer, and setting a sealing component for sealing the gap around the electric heating tube at the through hole, the gap around the electric heating tube is prevented from leaking hydrogen into the first cavity and causing safety failure. At the same time, the present disclosure also sets a second cavity and sets a reserved hole and an exhaust hole for purging protective gas on the second cavity, so as to discharge the hydrogen leaked from the drying tower into the second cavity into a safe environment, and finally achieve the purpose of ensuring the safety of the hydrogen purification process.

[0018] In addition, other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 is a schematic diagram of a hydrogen drying device in the related art;

[0021] Figure 2 is a schematic diagram of an implementation of an explosion-proof junction box for hydrogen purification disclosed in the present invention;

[0022] Figure 3 is a schematic top view of an isolation layer of the present disclosure;

[0023] Figure 4 is a schematic diagram of another implementation of the explosion-proof junction box for hydrogen purification disclosed in the present invention;

[0024] Figure 5 is a schematic diagram of an implementation of the hydrogen drying device disclosed in the present invention;

[0025] Figure 6 It is a schematic diagram of another implementation of the hydrogen drying device disclosed in the present invention.

[0026] Description of Reference Numerals

[0027] 1- Explosion-proof junction box for hydrogen purification;

[0028] 11-box body;

[0029] 111- first cavity;

[0030] 1111-cable access port; 1112-protective gas access port; 1113-isolation layer; 1114-through hole; 1115-sealing assembly;

[0031] 1115a-seal; 1115b-socket;

[0032] 112- second cavity;

[0033] 1121- first casing;

[0034] 113- Exhaust hole;

[0035] 114-reserved hole;

[0036] 2-electric heating tube; 21-electric heating tube connection part;

[0037] 3- Drying tower;

[0038] 31-second sleeve; 32-hydrogen inlet; 33-hydrogen outlet; 34-inner barrel; 35-sieve plate;

[0039] 4- Ordinary junction box. DETAILED DESCRIPTION

[0040] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0041] Reference Figure 2 As shown, the present disclosure provides an explosion-proof junction box for hydrogen purification, including a box body 11, wherein the box body 11 has a first cavity 111 for accommodating an electric heating tube wiring portion 21, and a cable access port 1111 and a protective gas access port 1112 communicating with the interior of the first cavity 111 are provided on the side wall of the first cavity 111.

[0042] An isolation layer 1113 is provided at the bottom of the first cavity 111 . A through hole 1114 for the electric heating tube 2 to pass through is formed on the isolation layer 1113 . A sealing component 1115 is provided on the through hole 1114 . The sealing component 1115 is used to seal the gap around the electric heating tube 2 .

[0043] It should be noted that, in this embodiment, the box body 11 is made of stainless steel, mainly to prevent corrosion from internal and external gases and water vapor. When the box body 11 is in use, a protective gas, such as nitrogen, is filled inside the box body 11 to protect the cable part connected to the electric heating tube 2 in the box body 11, thereby preventing hydrogen from leaking into the first cavity 111 in an unexpected situation and causing a safety accident.

[0044] Among them, the explosion-proof junction box 1 for hydrogen purification is also provided with an isolation layer 1113 at the bottom of the first cavity 111. The isolation layer 1113 can be arranged at the bottom of the first cavity 111 by welding or the like. The isolation layer 1113 here can isolate the explosion-proof junction box 1 for hydrogen purification from the hydrogen purification equipment thereunder, so that the hydrogen will not contact the cable part connected to the electric heating tube 2 in the upper explosion-proof junction box 1 for hydrogen purification during the purification process, thereby achieving the purpose of ensuring production safety during the hydrogen purification process.

[0045] In addition, the sealing assembly 1115 is provided in the through hole 1114 of the isolation layer 1113 in order to ensure that the electric heating tube 2 can smoothly pass through and enter the hydrogen purification equipment arranged below, while also being able to effectively seal the gaps around the heating tube 2 to prevent hydrogen from leaking into the first cavity 111 through the gaps around the heating tube 2.

[0046] In addition, during use, the first cavity 111 is filled with protective gas through the protective gas inlet 1112, which will generate positive pressure in the first cavity 111 to form a protective atmosphere, further preventing leaked hydrogen from entering the first cavity 111, thereby achieving the purpose of improving the safety of the hydrogen purification process.

[0047] Reference Figure 2 and Figure 3 As shown, as a possible implementation, the sealing assembly 1115 includes a sealing member 1115a and a socket 1115b for the electric heating tube 2 to pass through, the socket 1115b is installed in the through hole 1114, and the sealing member 1115a is tightly connected to the socket 1115b.

[0048] It should be noted that, in the present embodiment, the socket 1115b can be fixed in the through hole 1114 by bonding, threaded connection, etc., or other methods that can make the socket 1115b and the through hole 1114 tightly connected together, which is not limited in the present embodiment. The socket 1115b can be a hollow cylindrical shape with an internal thread inside. Similarly, the seal 1115a can also be a hollow cylindrical shape, through which the power supply heating tube 2 passes, and the outside has an external thread that matches the internal thread of the socket 1115b, so that the seal 1115a and the socket 1115b are locked by a threaded connection to prevent hydrogen from leaking from the connection between the seal 1115a and the socket 1115b.

[0049] In addition, the socket 1115b may also be formed integrally with the through hole 1114. The sealing component 1115 may also be a high temperature resistant sealing rubber ring, or other structures capable of achieving the purpose of the invention disclosed herein, which is not limited in this embodiment.

[0050] Reference Figure 4 As shown, as a possible implementation, a second cavity 112 is further provided in the box body 11, and the second cavity 112 is located below the first cavity 111; a first sleeve 1121 is provided in the second cavity 112 and penetrates the second cavity 112 from top to bottom, and the first sleeve 1121 is connected to the through hole 1114.

[0051] It should be noted that, in the present embodiment, a second cavity 112 is added at the lower part of the box body 11. Its main function is that when the explosion-proof junction box 1 for hydrogen purification is in use, the hydrogen purification equipment arranged thereunder may leak hydrogen. In this case, the leaked hydrogen will first enter the second cavity 112. However, since an isolation layer 1113 and a sealing assembly 1115 are provided at the bottom of the first cavity 111, the leaked hydrogen will be isolated in the second cavity 112 and will not enter the first cavity 111, thereby protecting the safe connection between the electric heating tube 2 and the cable in the first cavity 111, and finally achieving the protection of safe production during the hydrogen purification process.

[0052] Reference Figure 4 As shown, as a possible implementation, an exhaust hole 113 is provided on the side wall of the box body 11, and the exhaust hole 113 is connected to the inside of the second cavity 112; the side wall of the first sleeve 1121 is hollow.

[0053] It should be noted that, in the present embodiment, the side wall of the first sleeve 1121 is hollowed out so that when the explosion-proof junction box 1 for hydrogen purification is in use, if the hydrogen in the equipment below it leaks, it may enter the first sleeve 1121 and between the first sleeve 1121 and the second cavity 112 at the same time. When the hydrogen enters between the first sleeve 1121 and the second cavity 112, the hydrogen can be discharged to the outside through the exhaust hole 113. When the hydrogen enters the first sleeve 1121, since the first sleeve 1121 is a hollow structure, the hydrogen in the first sleeve 1121 will enter the second cavity 112 through the hollow structure of its side wall, and then be discharged to the outside through the exhaust hole 113.

[0054] Reference Figure 4 As shown, as a possible implementation, a reserved hole 114 is further provided on the side wall of the box body 11 , and the reserved hole 114 is communicated with the interior of the second cavity 112 , wherein the reserved hole 114 is used for purging the protective gas.

[0055] It should be noted that, in the present embodiment, when the reserved hole 114 is in use, a protective gas is provided on the outside thereof, which can be nitrogen, or other protective gases capable of achieving the purpose of the invention disclosed herein, which is not limited in the present embodiment. If a hydrogen leak occurs, the second cavity 112 can be purged through the reserved hole 114, and the protective gas will be discharged from the exhaust hole 113 to the outside of the factory building together with the leaked hydrogen after entering the second cavity 112. Here, when the reserved hole 114 is not in use, it can be blocked. In addition, the exhaust hole 113 here can be connected to a vent pipe, and a flame arrester can be further connected to ensure safety while venting the gas in the second cavity 112.

[0056] In addition, during the purging process, part of the protective gas entering the second cavity 112 will be distributed around the first sleeve 1121. When the outer wall of the first sleeve 1121 is a hollow structure, the presence of the protective gas will reduce the concentration of hydrogen near the electric heating tube 2, thereby further reducing the safety hazard when hydrogen leaks.

[0057] Reference Figure 4 As shown, as a possible implementation, the exhaust hole 113 and the reserved hole 114 are respectively and correspondingly arranged on opposite side walls of the box body 11 .

[0058] It should be noted that, in this embodiment, the reason why the exhaust hole 113 and the reserved hole 114 are respectively arranged on the opposite side walls of the box body 11 is to achieve a better purging effect during the purging process. Specifically, compared with the way that the protective gas during the purging process can be purged along a straight line when the exhaust hole 113 and the reserved hole 114 are arranged at relative positions on the side walls of the box body 11, if the exhaust hole 113 and the reserved hole 114 are arranged on any side wall of the box body 11, and the two are not in relative positions, the protective gas generated during the purging process will be blocked by the side wall of the box body 11 after entering the second cavity 112, causing its movement path to deflect multiple times, thereby making the purging effect worse.

[0059] Reference Figure 4 As shown, as a possible implementation, there are multiple first sleeves 1121 that are distributed at intervals.

[0060] It should be noted that, in this embodiment, the first sleeve 1121 is provided in plurality so as to flexibly select the number of electric heating tubes 2 that can be placed according to the heating needs during use. The plurality of first sleeves 1121 are distributed at intervals mainly to prevent the plurality of electric heating tubes 2 from being too close to each other, which may cause safety hazards.

[0061] Reference Figure 5 and Figure 6 As shown, the present disclosure also provides a hydrogen drying device, including a drying tower 3, an electric heating tube 2 and the aforementioned explosion-proof junction box 1 for hydrogen purification, the drying tower 3 is arranged below the explosion-proof junction box 1 for hydrogen purification, a second sleeve 31 is arranged in the drying tower 3, and the electric heating tube 2 is arranged in the second sleeve 31 through a sealing component 1115; a hydrogen inlet 32 ​​and a hydrogen outlet 33 are arranged on the side wall of the drying tower 3, and a desiccant, such as a molecular sieve, can be placed in the drying tower 3.

[0062] It should be noted that the explosion-proof junction box 1 for hydrogen purification in this embodiment can adopt the explosion-proof junction box 1 for hydrogen purification in the first implementation mode (refer to Figure 2), compared with the common junction box 4 in the related art, the improvement of this structure is that an isolation layer 1113 is provided at the bottom of the first cavity 111, and a sealing component 1115 for sealing the surrounding gap of the electric heating tube 2 is provided in the through hole 1114 of the isolation layer 1113; the explosion-proof junction box 1 for hydrogen purification in the second implementation mode (refer to Figure 4 ), this structure is based on the improvement of the previous explosion-proof junction box 1 for hydrogen purification, and adds a second cavity 112 and some other auxiliary structures to lead the leaked hydrogen from the second cavity 112 to the outside, so as to further reduce the safety hazards in the hydrogen purification process.

[0063] Reference Figure 5 As shown, when the explosion-proof junction box 1 for hydrogen purification in the first implementation is adopted, the structure of the hydrogen drying device includes the explosion-proof junction box 1 for hydrogen purification, the drying tower 3 and the electric heating tube 2. At this time, the drying tower 3 is arranged below the explosion-proof junction box 1 for hydrogen purification, the upper part of the electric heating tube 2 is electrically connected to the external cable through the electric heating tube connection part 21, and the lower part of the electric heating tube 2 is inserted into the second sleeve 31 through the sealing component 1115. Among them, the drying tower 3 and the explosion-proof junction box 1 for hydrogen purification can be connected by a flange. When in use, hydrogen enters the drying tower 3 through the hydrogen inlet 32, and the hydrogen is dried under the action of the electric heating tube 2. Finally, the hydrogen enters the collection container through the hydrogen outlet 33 after drying. During this process, the isolation layer 1113 and the sealing assembly 1115 arranged at the bottom of the first cavity 111 can effectively seal the gaps around the electric heating tube 2, preventing the leaked hydrogen from entering the first cavity 111 and affecting the electrically connected parts in the first cavity 111, thereby achieving the purpose of ensuring production safety during the hydrogen purification process.

[0064] Reference Figure 6 As shown, when the explosion-proof junction box 1 for hydrogen purification in the second implementation is adopted, the structure of the hydrogen drying device also includes the explosion-proof junction box 1 for hydrogen purification, the drying tower 3 and the electric heating tube 2. The only difference between it and the aforementioned hydrogen drying device is that a second cavity 112 and other auxiliary parts are added to the explosion-proof junction box 1 for hydrogen purification in the hydrogen drying device. The effect of the additional parts on the hydrogen drying device has been described in detail in the aforementioned embodiment, and will not be repeated in this embodiment.

[0065] Reference Figure 5 and Figure 6As shown, as a possible implementation, an inner barrel 34 is provided in the drying tower 3, the hydrogen inlet 32 ​​is connected to the inner barrel 34, the second sleeve 31 is arranged in the inner barrel 34, a sieve plate 35 is arranged at the bottom of the inner barrel 34, and the sieve plate 35 is connected to the inner wall of the drying tower 3. A desiccant is placed on the sieve plate 35, and the desiccant is located between the inner wall of the drying tower 3 and the inner barrel 34.

[0066] It should be noted that, in this embodiment, the inner barrel 34 and the sieve plate 35 are provided so that after the hydrogen enters the inner barrel 34, it is first heated by the electric heating tube 2 provided in the inner barrel 34, and then the hydrogen fully contacts the desiccant through the sieve plate 35, so that the desiccant adsorbs and removes the moisture in the hydrogen, and finally, the dried hydrogen is discharged into the collection container through the hydrogen outlet 33. The provision of the inner barrel 34 and the sieve plate 35 can improve the drying effect of the hydrogen.

[0067] The present disclosure also provides a water electrolysis system, including a hydrogen purification system, and the hydrogen purification system includes a hydrogen drying device.

[0068] It should be noted that, in this embodiment, the hydrogen drying device in the hydrogen purification system adopts the structure of the hydrogen drying device in the aforementioned embodiment, while other structures and connection relationships in the hydrogen purification system adopt the existing technology, which is not limited in this embodiment.

[0069] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An explosion-proof junction box for hydrogen purification, characterized in that: The box body (11) comprises a first cavity (111) for accommodating a connection portion (21) of an electric heating tube, and a cable access port (1111) and a protective gas access port (1112) which are in communication with the interior of the first cavity (111) are provided on a side wall of the first cavity (111); An isolation layer (1113) is welded to the bottom of the first cavity (111), a through hole (1114) for the electric heating tube (2) to pass through is formed on the isolation layer (1113), and a sealing component (1115) is provided on the through hole (1114), and the sealing component (1115) is used to seal the gap around the electric heating tube (2); A second cavity (112) is also provided in the box body (11), and the second cavity (112) is located below the first cavity (111); A first sleeve (1121) is arranged in the second cavity (112) and penetrates the second cavity (112) from top to bottom, and the first sleeve (1121) is communicated with the through hole (1114); An exhaust hole (113) is provided on the side wall of the box body (11), and the exhaust hole (113) is in communication with the interior of the second cavity (112); The side wall of the first sleeve (1121) is hollow.

2. The explosion-proof junction box for hydrogen purification according to claim 1, characterized in that: The sealing assembly (1115) comprises a sealing member (1115a) and a socket (1115b) for the electric heating tube (2) to pass through; the socket (1115b) is installed in the through hole (1114); and the sealing member (1115a) is tightly connected to the socket (1115b).

3. The explosion-proof junction box for hydrogen purification according to claim 1, characterized in that: A reserved hole (114) is also provided on the side wall of the box body (11), and the reserved hole (114) is communicated with the interior of the second cavity (112), wherein the reserved hole (114) is used for purging protective gas.

4. The explosion-proof junction box for hydrogen purification according to claim 3, characterized in that: The exhaust hole (113) and the reserved hole (114) are respectively and correspondingly arranged on opposite side walls of the box body (11).

5. The explosion-proof junction box for hydrogen purification according to claim 1, characterized in that: The first sleeves (1121) are multiple and distributed at intervals.

6. A hydrogen drying device, characterized in that: The invention comprises a drying tower (3), an electric heating tube (2), and an explosion-proof junction box (1) for hydrogen purification according to any one of claims 1 to 5, wherein the drying tower (3) is arranged below the explosion-proof junction box (1) for hydrogen purification, a second sleeve (31) is arranged in the drying tower (3), and the electric heating tube (2) is arranged in the second sleeve (31) through the sealing assembly (1115); A hydrogen inlet (32) and a hydrogen outlet (33) are provided on the side wall of the drying tower (3).

7. The hydrogen drying device according to claim 6, characterized in that: An inner barrel (34) is provided in the drying tower (3), the hydrogen inlet (32) is in communication with the inner barrel (34), the second sleeve (31) is arranged in the inner barrel (34), a sieve plate (35) is provided at the bottom of the inner barrel (34), and the sieve plate (35) is connected to the inner wall of the drying tower (3).

8. A water electrolysis system, characterized in that: It comprises a hydrogen purification system, wherein the hydrogen purification system comprises the hydrogen drying device according to claim 6 or 7.

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