Heat exchanger sealing structure for hydrogen production system

Abstract

The utility model discloses a kind of heat exchanger sealing structure for hydrogen production system, including heat exchanger, the output end and the input end of heat exchanger are respectively sealed with feed pipe and discharge pipe, the output end and the input end of heat exchanger are all set with first ring groove, the feed pipe and discharge pipe end part are all provided with second ring groove, the first ring groove and second ring groove are mutually inserted, the first ring groove is provided with the aeration sealing assembly in contact with second ring groove;The utility model realizes the multistage sealing of the connecting place of heat exchanger and feed pipe and discharge pipe by first ring groove, second ring groove, sealing air cushion, metal sealing gasket and sealing cover, guarantees the sealing effect and reliability of heat exchanger and feed pipe and discharge pipe when connecting.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange equipment and relates to a sealing structure for a heat exchanger used in a hydrogen production system. Background Technology

[0002] With the development of the hydrogen energy industry, heat exchangers are widely used in hydrogen production systems to achieve heat exchange in reactors, coolers, and gas-liquid separation processes. Under hydrogen production conditions, heat exchangers often face complex operating conditions such as high temperature, high pressure, humidity, and hydrogen permeation. Traditional heat exchangers typically use welding or simple single-ring O-ring seals for their sealing structures.

[0003] Chinese utility model patent CN210689308U discloses a heat exchanger for methanol-to-hydrogen production, comprising a shell, a feed hood at the top of the shell with a feed pipe fixedly connected to the top of the feed hood, a discharge hood at the bottom of the shell with a discharge pipe fixedly connected to the bottom of the discharge hood, a first fixing ring plate symmetrically arranged at the upper and lower ends of the shell on the outer side of the shell, a second fixing ring plate fixedly connected to the outer side of the feed hood and the discharge hood, an oil inlet pipe connected to the upper left side of the shell, and an oil outlet pipe connected to the lower right side of the shell, with connecting plates provided on the feed pipe, the discharge pipe, the oil inlet pipe, and the oil outlet pipe; In the aforementioned prior art, the heat exchanger is still sealed to the outside world using the common flange sealing ring method. Under hydrogen production conditions, the heat exchanger often faces complex conditions such as high temperature, high pressure, humidity and hydrogen permeation. The common flange sealing ring method may not be able to guarantee the sealing effect of the heat exchanger, leading to gas leakage inside the heat exchanger. Utility Model Content

[0004] The existing technology still uses common flange seals to seal the heat exchanger to the outside environment. However, in hydrogen production, heat exchangers often face complex conditions such as high temperature, high pressure, humidity, and hydrogen permeation. Common flange seals may not guarantee a proper seal, leading to gas leakage. This invention proposes a sealing structure for a heat exchanger in a hydrogen production system. This effectively solves the problem of gas leakage caused by the common flange seals used in existing heat exchangers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a heat exchanger sealing structure for a hydrogen production system, comprising a heat exchanger, wherein the output end and the input end of the heat exchanger are respectively sealed and connected to a feed pipe and a discharge pipe, both the output end and the input end of the heat exchanger are provided with a first annular groove, and both the feed pipe and the discharge pipe are provided with a second annular groove, wherein the first annular groove and the second annular groove are interlocked, and an air-filled sealing component that contacts the second annular groove is provided in the first annular groove.

[0006] Furthermore, the gas-filled sealing assembly includes a sealing gas pad within the first annular groove, and the outer surfaces of both the output and input ends of the heat exchanger are provided with gas nozzles connected to the sealing gas pad.

[0007] Furthermore, the sealing gasket is made of fluororubber.

[0008] Furthermore, the inner side of the sealing air cushion is provided with a metal liner, the material of which is 0.03mm stainless steel foil.

[0009] Furthermore, the output end and input end of the heat exchanger are fixedly connected to the feed pipe and discharge pipe through flanges, fixing nuts and fixing bolts. The fixing bolts and fixing nuts are distributed in a ring array on the flange with the center of the flange as the center.

[0010] Furthermore, a sealing gasket is provided between the input and output ends of the heat exchanger and the flanges of the feed pipe and discharge pipe.

[0011] Furthermore, the sealing gasket is made of stainless steel metal gasket layer.

[0012] Furthermore, the outer side of the flange is covered with a sealing cover, which is fixedly connected to the outer side of the flange by fixing bolts.

[0013] Furthermore, the sealing cover is made of hydrofluoric acid resistant rubber.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model achieves multi-level sealing at the connection between the heat exchanger and the feed pipe and the discharge pipe through the first annular groove, the second annular groove, the sealing gasket, the metal sealing gasket and the sealing cover, which ensures the sealing effect and reliability of the heat exchanger and the feed pipe and the discharge pipe when connected. (2) The sealing gas pad in this utility model is made of fluororubber material with excellent chemical weather resistance and hydrogen resistance, and a stainless steel metal liner is set on the inner side of the sealing gas pad. The metal liner can prevent or delay the direct penetration of hydrogen molecules, and can also prevent the material from being sheared or squeezed out when the sealing gas pad is under pressure, which significantly extends the service life of the sealing gas pad and improves its stability in humid or chemically corrosive environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of part A; Figure 3 This is a front view of the present utility model; Figure 4 This is a schematic diagram of the structure of the sealing gasket of this utility model.

[0016] In the figure: 1. Heat exchanger; 101. First annular groove; 2. Feed pipe; 201. Second annular groove; 3. Discharge pipe; 4. Sealing cover; 5. Fixing bolt; 6. Fixing nut; 7. Air nozzle; 8. Sealing gasket; 9. Sealing gasket; 10. Flange; 11. Metal liner. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0018] like Figures 1 to 4 As shown, a heat exchanger sealing structure for a hydrogen production system includes a heat exchanger 1. The output end and input end of the heat exchanger 1 are respectively sealed and connected to a feed pipe 2 and a discharge pipe 3. The output end and input end of the heat exchanger 1 are each provided with a first annular groove 101. The ends of the feed pipe 2 and the discharge pipe 3 are each provided with a second annular groove 201. The first annular groove 101 and the second annular groove 201 are interlocked. An air-filled sealing component that contacts the second annular groove 201 is provided in the first annular groove 101.

[0019] In this embodiment, the air-filled sealing assembly includes a sealing gas pad 8 in the first annular groove 101, and the outer surfaces of the output end and the input end of the heat exchanger 1 are provided with air nozzles 7 connected to the sealing gas pad 8.

[0020] In this embodiment, the sealing gasket 8 is made of fluororubber.

[0021] In this embodiment, a metal liner 11 is provided on the inner side of the sealing air cushion 8, and the metal liner 11 is made of 0.03mm stainless steel foil.

[0022] In this embodiment, the output end and input end of the heat exchanger 1 are fixedly connected to the feed pipe 2 and the discharge pipe 3 through a flange 10, a fixing nut 6 and a fixing bolt 5. The fixing bolt 5 and the fixing nut 6 are arranged in a ring array on the flange 10 with the center of the flange 10 as the center.

[0023] In this embodiment, a sealing gasket 9 is provided between the input end and the output end of the heat exchanger 1 and the flange 10 of the feed pipe 2 and the discharge pipe 3.

[0024] In this embodiment, the sealing gasket 9 is made of stainless steel metal gasket.

[0025] In this embodiment, the outer side of the flange 10 is covered with a sealing cover 4, and the sealing cover 4 is fixedly connected to the outer side of the flange 10 by fixing bolts 5 and fixing bolts 5.

[0026] In this embodiment, the sealing cover 4 is made of hydrofluoric acid resistant rubber.

[0027] When using the above embodiments: The heat exchanger 1 has a first annular groove 101 on the end face of both the input end and the output end. The feed pipe 2 and the discharge pipe 3 have a second annular groove 201 at their ends that cooperate with the first annular groove 101. After the two annular grooves are inserted, an annular gap is formed on the mating surface. An inflatable sealing gas pad 8 is provided inside the first annular groove 101. During use, the operator's air nozzle 7 fills the sealing gas pad 8 with inert gas, causing the sealing gas pad 8 to expand to a predetermined working pressure. The sealing gas pad 8 expands and evenly presses against the outer circumferential surface of the second annular groove 201 along the annular groove direction, thereby forming an elastic contact sealing surface at the junction of the heat exchanger 1 input end and output end with the feed pipe 2 and the discharge pipe 3. The inner side of the sealing gas pad 8 is provided with a 0.03mm stainless steel foil metal liner 11. When the sealing gas pad 8 is compressed, the metal liner 11 bears the local tensile and tangential stress, which improves the protective performance of the sealing gas pad 8, prevents the sealing gas pad 8 from being damaged and leaking air, ensures the reliability of the sealing gas pad 8 during use, and extends the service life of the sealing gas pad 8. At the same time, the metal liner 11 plays the role of blocking or delaying hydrogen permeation. The metal gasket 9 sandwiched between the heat exchanger 1 and the feed pipe 2 and the discharge pipe 3 flange 10 can form a secondary seal between the heat exchanger 1 and the feed pipe 2 and the discharge pipe 3, further ensuring the sealing effect between the heat exchanger 1 and the feed pipe 2 and the discharge pipe 3. The sealing cover 4 made of hydrogen fluoride resistant rubber material covering the outside of the flange 10 can form a tertiary seal and effective protection between the heat exchanger 1 and the feed pipe 2 and the discharge pipe 3, preventing the metal gasket 9 from being corroded and damaged by external media, ensuring the reliability of the metal gasket 9 during use, and extending the service life of the metal gasket 9. The heat exchanger 1 is fastened to the feed pipe 2 and the discharge pipe 3 by a ring of fixed bolts 5 and fixed nuts 6, which ensures the reliability of the connection between the heat exchanger 1 and the feed pipe 2 and the discharge pipe 3.

[0028] Example 2 differs from Example 1 in that: To ensure operational safety and ease of maintenance, the air nozzle 7 can be interlocked with the pressure sensor, one-way valve, and pressure relief device to monitor the inflation pressure of the sealing gasket 8 in real time. When the pressure of the sealing gasket 8 drops, it indicates that the sealing of the gasket has deteriorated or leaked, requiring maintenance by personnel. During maintenance, the air cushion can be depressurized to allow it to retract, thus enabling disassembly and replacement without welding or damage.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat exchanger sealing structure for a hydrogen production system, comprising a heat exchanger (1), wherein the output end and input end of the heat exchanger (1) are respectively sealed and connected to a feed pipe (2) and a discharge pipe (3), characterized in that: The heat exchanger (1) has a first annular groove (101) at both the output and input ends. The feed pipe (2) and the discharge pipe (3) are provided with a second annular groove (201) at their ends. The first annular groove (101) and the second annular groove (201) are connected to each other. An air-filled sealing assembly that contacts the second annular groove (201) is provided in the first annular groove (101).

2. The heat exchanger sealing structure for a hydrogen production system according to claim 1, characterized in that: The gas-filled sealing assembly includes a sealing gas pad (8) in the first annular groove (101), and the outer surfaces of the output end and input end of the heat exchanger (1) are provided with gas nozzles (7) connected to the sealing gas pad (8).

3. The heat exchanger sealing structure for a hydrogen production system according to claim 2, characterized in that: The sealing gasket (8) is made of fluororubber.

4. The heat exchanger sealing structure for a hydrogen production system according to claim 3, characterized in that: The inner side of the sealing air cushion (8) is provided with a metal liner (11), and the material of the metal liner (11) is 0.03mm stainless steel foil.

5. The heat exchanger sealing structure for a hydrogen production system according to claim 1, characterized in that: The output end and input end of the heat exchanger (1) are fixedly connected to the feed pipe (2) and the discharge pipe (3) through the flange (10), the fixing nut (6) and the fixing bolt (5). The fixing bolt (5) and the fixing nut (6) are arranged in a ring array on the flange (10) with the center of the flange (10) as the center.

6. The heat exchanger sealing structure for a hydrogen production system according to claim 5, characterized in that: A sealing gasket (9) is provided between the input end and the output end of the heat exchanger (1) and the flange (10) of the feed pipe (2) and the discharge pipe (3).

7. The heat exchanger sealing structure for a hydrogen production system according to claim 6, characterized in that: The sealing gasket (9) is made of stainless steel metal gasket.

8. The heat exchanger sealing structure for a hydrogen production system according to claim 5, characterized in that: The flange (10) is covered with a sealing cover (4) on the outside, and the sealing cover (4) is fixedly connected to the outer surface of the flange (10) by fixing bolts (5).

9. A heat exchanger sealing structure for a hydrogen production system according to claim 8, characterized in that: The sealing cover (4) is made of hydrofluoric acid resistant rubber.

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