Heat exchange equipment for small hydrogen production system

Abstract

The utility model relates to the technical field of heat exchange equipment, and discloses heat exchange equipment for a small hydrogen production system, which comprises a heat exchange tube group, a first seal head, a second seal head and a refrigerant coil, the heat exchange pipe set comprises a first pipeline, a first elbow, a second pipeline, a second elbow and a third pipeline which are communicated in sequence, the first pipeline and the third pipeline are vertically arranged, and the second pipeline is transversely arranged; one end of the refrigerant coil penetrates through the side wall of the first pipeline and extends outwards to form a refrigerant inlet, the other end of the refrigerant coil penetrates through the side wall of the third pipeline and extends outwards to form a refrigerant outlet, a heating medium inlet is formed in the first sealing head, and a heating medium outlet is formed in the second sealing head. The utility model has the beneficial effects that the structure is simple, the overall volume of equipment can be reduced, and larger pressure can be borne.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a heat exchange equipment used in a small hydrogen production system. Background Art

[0002] For small hydrogen production systems, the space for arranging heat exchange equipment inside is small, and shell and tube heat exchangers cannot be installed. Due to the spacing between baffles and the pipe layout space of shell and tube heat exchangers (according to GB / T151, the flow space between the baffles and the spacing between the heat exchange tube and the inner wall of the shell must be considered), the structure is large and complex, and is not suitable for compact hydrogen production systems in small spaces. For plate heat exchangers, although their structure is small (smaller volume can meet larger heat exchange), their defect is low pressure resistance. Generally speaking, plate heat exchangers using fusion welding (due to the corrosiveness of the medium and the requirements for cleanliness, stainless steel fusion welding must be used) have a pressure resistance of less than 1.6MPa. If the hydrogen production system needs to be higher than 1.6MPa or even higher than 3.2MPa, the plate heat exchanger cannot meet the demand. Utility Model Content

[0003] The purpose of the utility model is to provide a heat exchange device for a small hydrogen production system, which has a simple structure and can reduce the overall volume of the device, is suitable for a small hydrogen production system, and can withstand a large pressure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a heat exchange device for a small hydrogen production system, including a heat exchange tube group, a first end cap, a second end cap and a refrigerant coil;

[0005] The heat exchange tube group comprises a first pipe, a first elbow, a second pipe, a second elbow and a third pipe which are connected in sequence, the first pipe and the third pipe are arranged vertically, the second pipe is arranged horizontally, one end of the first pipe is connected to the first end cap, the other end of the first pipe is connected to the first elbow, one end of the second pipe is connected to the other end of the first elbow, the other end of the second pipe is connected to the second elbow, one end of the third pipe is connected to the second elbow, and the other end is connected to the second end cap;

[0006] The refrigerant coil is located in a cavity formed by the first head, the first pipe, the first elbow, the second pipe, the second elbow, the third pipe and the second head, one end of the refrigerant coil passes through the side wall of the first pipe and extends outward to form a refrigerant inlet, the other end of the refrigerant coil passes through the side wall of the third pipe and extends outward to form a refrigerant outlet, the first head is provided with a heat medium inlet, the second head is provided with a heat medium outlet, and the heat medium inlet and the heat medium outlet are connected to the cavity.

[0007] Furthermore, the number of the first pipeline, the second pipeline, and the third pipeline is at least one, the first pipeline and the second pipeline are connected via the first elbow, and the second pipeline and the third pipeline are connected via the second elbow.

[0008] Furthermore, the heat exchange tube group has a U-shape.

[0009] Furthermore, the first pipe, the first elbow, the second pipe, the second elbow, and the third pipe have the same diameter.

[0010] Furthermore, the first pipeline, the first elbow, the second pipeline, the second elbow, and the third pipeline are fixed by welding.

[0011] Furthermore, the bending angles of the first elbow and the second elbow are equal, and the range of the bending angle is 90°-150°.

[0012] Furthermore, the heat medium inlet is located on the outer wall of the first end cover and is coaxially arranged with the first end cover.

[0013] Furthermore, the axis of the refrigerant inlet is perpendicular to the axis of the first pipe, and the axis of the refrigerant outlet is perpendicular to the axis of the third pipe.

[0014] Compared with the prior art, the heat exchange equipment for a small hydrogen production system in the embodiment of the utility model has the following beneficial effects: the heat exchange tube group includes a first pipe, a first elbow, a second pipe, a second elbow and a third pipe connected in sequence, the first pipe and the third pipe are arranged vertically, the second pipe is arranged horizontally, the first elbow is used to connect the first pipe and the second pipe, the second elbow is used to connect the second pipe and the third pipe, the first elbow and the second elbow are used to bend the heat exchange tube group, the overall structure is simple, and the volume of the equipment is reduced. At the same time, the overall structure can bear a large pressure to meet the pressure requirements in the small hydrogen production system. In addition, the refrigerant coil is located in the cavity formed by the first head, the first pipe, the first elbow, the second pipe, the second elbow, the third pipe and the second head, the cavity is used to fill the hot medium, and the refrigerant coil is filled with the cold medium, which is used to exchange heat with the hydrogen production system, thereby increasing the heat dissipation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a heat exchange device used in a small hydrogen production system according to an embodiment of the utility model;

[0016] Figure 2 It is a cross-sectional view of a heat exchange device used in a small hydrogen production system according to an embodiment of the utility model;

[0017] Figure 3This is a pressure analysis diagram of a heat exchange device used in a small hydrogen production system according to an embodiment of the utility model;

[0018] In the figure, 1, heat exchange tube group; 11, first pipeline; 12, first elbow; 13, second pipeline; 14, second elbow; 15, third pipeline; 2, first head; 21, heat medium inlet; 3, second head; 31, heat medium outlet; 4, refrigerant coil; 41, refrigerant inlet; 42, refrigerant outlet; 5, cavity. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices and elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0022] like Figure 1 As shown, a heat exchange device for a small hydrogen production system according to a preferred embodiment of the utility model comprises a heat exchange tube group 1, a first end cap 2, a second end cap 3 and a refrigerant coil 4; wherein the first end cap 2 is provided at one end of the heat exchange tube group 1, and the second end cap 3 is provided at the other end, and the refrigerant coil 4 is located in the heat exchange tube group 1. Specifically, refer to Figure 2The heat exchange tube group 1 includes a first pipe 11, a first elbow 12, a second pipe 13, a second elbow 14 and a third pipe 15 which are connected in sequence, wherein the first pipe 11 and the third pipe 15 are arranged vertically, and the second pipe 13 is arranged horizontally. In this embodiment, in order to facilitate the connection between the pipes, one end of the first pipe 11 is connected to the first head 2, the other end of the first pipe 11 is connected to the first elbow 12, one end of the second pipe 13 is connected to the other end of the first elbow 12, the other end of the second pipe 13 is connected to the second elbow 14, one end of the third pipe 15 is connected to the second elbow 14, and the other end A second end cap 3 is connected, and the first end cap 2, the first pipe 11, the first elbow 12, the second pipe 13, the second elbow 14, the third pipe 15 and the second end cap 3 form a cavity 5 for filling a heat medium. In order to facilitate connection with an external heat medium supply device and realize the circulation of the heat medium, a heat medium inlet 21 is provided on the first end cap 2, and a heat medium outlet 31 is provided on the second end cap 3. The heat medium inlet 21 and the heat medium outlet 31 are connected to the cavity 5, wherein the heat medium inlet 21 is connected to the discharge port of the external heat medium supply device, and the heat medium outlet 31 is connected to the feed port of the external heat medium supply device. For a small hydrogen production system, the heat medium is alkali liquid, hydrogen or oxygen.

[0023] Specifically, the refrigerant coil 4 is a spiral pipe, which increases the heat dissipation area. In order to facilitate the setting of the refrigerant coil 4, the refrigerant coil 4 is located in the cavity 5. In order to facilitate the connection between the refrigerant coil 4 and the external refrigerant medium supply equipment, one end of the refrigerant coil 4 passes through the side wall of the first pipe 11 and extends outward to form a refrigerant inlet 41, and the other end of the refrigerant coil 4 passes through the side wall of the third pipe 15 and extends outward to form a refrigerant outlet 42. The refrigerant medium is generally cooling water or chilled water.

[0024] Further, in this embodiment, the number of the first pipeline 11, the second pipeline 13, and the third pipeline 15 is at least one, wherein the first pipeline 11 and the second pipeline 13 are connected via a first elbow 12, and the second pipeline 13 and the third pipeline 15 are connected via a second elbow 14. According to the heat exchange amount required by the hydrogen production system, the heat exchange tube group 1 can be extended or changed in direction via the first elbow 12 and / or the second elbow 14, thereby increasing the heat exchange area.

[0025] In this embodiment, in order to simplify the overall structure, the number of the first pipe 11, the second pipe 13, and the third pipe 15 is 1, and the shape of the heat exchange tube group 1 is U-shaped. In this embodiment, the first pipe 11, the second pipe 13, and the third pipe 15 are standard seamless steel pipes with the same diameter. According to SH 3405-2017 "Petrochemical Steel Pipe Size Series", DN300 stainless steel seamless steel pipes are selected, and the wall thickness grade is SCH80S. The first elbow 12 and the second elbow 14 have the same structure and use standard elbows. According to GB / T 12459-2017 "Steel Butt Welding Pipe Fitting Types and Parameters", the bending radius of the DN300 elbow is 305mm. The bending angles of the first elbow 12 and the second elbow 14 can also be adjusted according to actual installation requirements. The bending angles of the first elbow 12 and the second elbow 14 range from 90° to 150°. The first end cap 2 and the second end cap 3 are standard end caps, and according to GB / T 25198-2023 "Head caps for pressure vessels", the total height H is 106 mm. Furthermore, in order to facilitate the connection of various parts, the first pipe 11, the first elbow 12, the second pipe 13, the second elbow 14, and the third pipe 15 are fixed by welding.

[0026] Further, in order to facilitate the determination of the specific positions of the heat medium inlet 21 and the heat medium outlet 31, in this embodiment, the heat medium inlet 21 is located on the outer wall of the first end cap 2 and is coaxially arranged with the first end cap 2. Similarly, the heat medium outlet 31 is located on the outer wall of the second end cap 3 and is coaxially arranged with the second end cap 3. Furthermore, in order to further determine the position of the refrigerant coil 4, referring to the figure, the axis of the refrigerant inlet is perpendicular to the axis of the first pipe 11, and the axis of the refrigerant outlet 42 is perpendicular to the axis of the third pipe 15.

[0027] Furthermore, in order to verify the pressure bearing capacity of the heat exchange device provided in this embodiment, a stress analysis is performed on it. Figure 3 As shown in the figure, when subjected to an internal pressure of 5MPa, the maximum stress of the structure is 109MPa. According to GB150-2011 "Pressure Vessels", the allowable stress of 316L (S31603) steel pipes in an environment of ≤150℃ is 117MPa. Therefore, the structure can withstand a pressure of 5MPa. Compared with existing plate heat exchangers, it has better pressure bearing capacity.

[0028] In summary, the embodiment of the utility model provides a heat exchange device for a small hydrogen production system, the heat exchange tube group 1 includes a first pipe 11, a first elbow 12, a second pipe 13, a second elbow 14 and a third pipe 15 connected in sequence, the first pipe 11 and the third pipe 15 are arranged vertically, the second pipe 13 is arranged horizontally, the first elbow 12 is used to connect the first pipe 11 and the second pipe 13, the second elbow 14 is used to connect the second pipe 13 and the third pipe 15, the first elbow 12 and the second elbow 14 are used to bend the heat exchange tube group 1, the overall structure is simple, the equipment volume is reduced, and at the same time, the overall structure can bear a large pressure to meet the pressure requirements in the small hydrogen production system. In addition, the refrigerant coil 4 is located in the cavity 5 formed by the first head 2, the first pipe 11, the first elbow 12, the second pipe 13, the second elbow 14, the third pipe 15 and the second head 3, the cavity 5 is used to fill the hot medium, and the refrigerant coil 4 is filled with the cold medium, which is used to exchange heat with the hydrogen production system, thereby increasing the heat dissipation area.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A heat exchange device for a small hydrogen production system, characterized in that: It includes a heat exchange tube group, a first end cap, a second end cap and a refrigerant coil; The heat exchange tube group comprises a first pipe, a first elbow, a second pipe, a second elbow and a third pipe which are connected in sequence, the first pipe and the third pipe are arranged vertically, the second pipe is arranged horizontally, one end of the first pipe is connected to the first end cap, the other end of the first pipe is connected to the first elbow, one end of the second pipe is connected to the other end of the first elbow, the other end of the second pipe is connected to the second elbow, one end of the third pipe is connected to the second elbow, and the other end is connected to the second end cap; The refrigerant coil is located in a cavity formed by the first head, the first pipe, the first elbow, the second pipe, the second elbow, the third pipe and the second head, one end of the refrigerant coil passes through the side wall of the first pipe and extends outward to form a refrigerant inlet, the other end of the refrigerant coil passes through the side wall of the third pipe and extends outward to form a refrigerant outlet, the first head is provided with a heat medium inlet, the second head is provided with a heat medium outlet, and the heat medium inlet and the heat medium outlet are connected to the cavity.

2. The heat exchange equipment for a small hydrogen production system according to claim 1, characterized in that: The number of the first pipeline, the second pipeline, and the third pipeline is at least one, the first pipeline and the second pipeline are connected via the first elbow, and the second pipeline and the third pipeline are connected via the second elbow.

3. The heat exchange device for a small hydrogen production system according to claim 2, characterized in that: The heat exchange tube group has a U-shape.

4. The heat exchange equipment for a small hydrogen production system according to claim 1, characterized in that: The first pipe, the first elbow, the second pipe, the second elbow, and the third pipe have the same diameter.

5. The heat exchange equipment for a small hydrogen production system according to claim 1, characterized in that: The first pipeline, the first elbow, the second pipeline, the second elbow, and the third pipeline are fixed by welding.

6. The heat exchange device for a small hydrogen production system according to claim 1, characterized in that: The bending angles of the first elbow and the second elbow are equal, and the range of the bending angle is 90°-150°.

7. The heat exchange equipment for a small hydrogen production system according to claim 1, characterized in that: The heat medium inlet is located on the outer wall of the first end cover and is coaxially arranged with the first end cover.

8. The heat exchange equipment for a small hydrogen production system according to claim 1, characterized in that: The axis of the refrigerant inlet is perpendicular to the axis of the first pipe, and the axis of the refrigerant outlet is perpendicular to the axis of the third pipe.

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