Hydrogen purification process and device

Abstract

The application discloses a hydrogen purification and purification process and device, and belongs to the technical field of hydrogen purification and purification. A hydrogen purification and purification device comprises a raw material gas tank for providing raw materials, an adsorption tank for purification and purification, a regeneration gas tank for providing regeneration gas, and a hydrogen tank for providing high-purity hydrogen. The adsorption tank is provided with at least two, and the adsorption tank, the raw material gas tank, the hydrogen tank and the regeneration gas tank are arranged on a carrier. One tank body corresponds to one carrier, and the carriers are detachably connected. The carrier can be used for separately installing each tank body on one carrier, protecting the tank body, connecting the carriers together, improving stability, and integrally transferring without detaching the pipelines during transfer, so that the problem that the purification device is not modular in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of hydrogen purification technology, and in particular to a hydrogen purification process and apparatus. Background Technology

[0002] Today, hydrogen energy utilization is seen as a sustainable energy utilization path that runs parallel to the clean and low-carbon utilization of fossil fuels and the large-scale utilization of renewable energy. The role and value of hydrogen energy in the energy transition process are becoming increasingly prominent, and the interconnection and interaction of fossil energy, new energy and hydrogen-electric secondary energy networks will become a long-term application scenario.

[0003] Currently, hydrogen purification technologies mainly include PSA (Pressure Swing Adsorption), TSA (Temperature Swing Adsorption), and transition metal membrane separation processes. Regardless of whether it's PSA or TSA, the general process involves adsorbing impurities using an adsorbent under certain conditions, followed by desorption under different conditions. When the hydrogen adsorber becomes saturated and requires regeneration, the regeneration depth is often too low, affecting the safe operation of the hydrogen liquefaction system and the purity of the liquid hydrogen. Furthermore, existing adsorption tanks are not modular enough and cannot be easily moved, thus requiring improvement. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low hydrogen adsorption purification and regeneration depth and insufficient modularity of the equipment in the prior art, and to propose a hydrogen purification process and device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hydrogen purification process and apparatus includes a raw material gas tank for providing raw materials, an adsorption tank for purification, a regeneration gas tank for providing regeneration gas, and a hydrogen tank for providing high-purity hydrogen. At least two adsorption tanks are provided. The adsorption tank, raw material gas tank, hydrogen tank, and regeneration gas tank are all mounted on a carrier, with one tank corresponding to one carrier. The carriers are detachably connected to each other.

[0006] Preferably, the carrier includes a base, and the adsorption tank, raw material gas tank, hydrogen tank and regeneration gas tank are respectively fixedly mounted on the corresponding base.

[0007] Preferably, the carrier further includes a fixing frame, which is fixedly mounted on the base and frames the corresponding tank.

[0008] Preferably, the base has four sides with fixed inserts and holes, and the inserts and holes on the same side are arranged side by side and matched.

[0009] Preferably, the bases of adjacent carriers are connected by insert blocks into insertion holes and are limited by first bolts.

[0010] Preferably, the fixing frame is a square frame with a screw hole at the top. Adjacent fixing frames are connected by a connecting rod, and both ends of the connecting rod are fixed by screwing a second bolt into the corresponding screw hole.

[0011] Preferably, the adsorption tank is provided with a heat exchange tube, and the heat exchange tube is provided with several layers of mesh, each layer of mesh is filled with adsorbent, and the spacing between the meshes is changed by a driving structure. The adsorption tank is also provided with a partition plate, and the partition plate is provided with air holes.

[0012] Preferably, the number of mesh layers is odd, and the driving structure includes a rotating shaft rotatably disposed in the middle of the adsorption tank. The rotating shaft is provided with several threaded segments of different pitches, and the number of threaded segments is one less than the number of mesh layers. The mesh in the middle layer is rotatably connected to the rotating shaft and fixedly connected to the heat exchange tube. The other mesh layers are threadedly connected to their corresponding threaded segments and slidably connected to the heat exchange tube. The rotating shaft is driven by a motor.

[0013] A hydrogen purification process includes the following steps: Step 1: After heating the raw hydrogen gas, send it to the deoxygenator for deoxygenation; Step 2: The deoxygenated raw hydrogen is sent to the raw material gas tank for storage. Step 3: The raw material gas enters one of the adsorption tanks from the raw material gas tank for adsorption and purification, and then the product gas is discharged from the outlet. Step 4: When the adsorbent in the adsorption tank of Step 3 is saturated, regeneration gas is introduced for desorption, and another adsorption tank performs adsorption operation at this time. Step 5: After desorption in step 4, high-purity hydrogen from the hydrogen tank is introduced into the adsorption tank to discharge the regeneration gas, and then prepare for the next adsorption. Step 6: Circulate the above steps through at least two adsorption tanks.

[0014] Preferably, the deaerator in step one is a deaerator equipped with a palladium catalyst.

[0015] Compared with the prior art, the present invention provides a hydrogen purification process and apparatus, which has the following beneficial effects.

[0016] 1. The present invention, through the setting of the carrier frame, allows each tank to be installed on a separate carrier frame, which can both protect the tank and connect the carrier frames together, thereby improving stability. During transfer, the entire device can be transferred without disassembling the pipeline, thus solving the problem of insufficient modularity of purification devices in the prior art.

[0017] 2. This invention, by using high-purity hydrogen to discharge the regeneration gas, can prevent the already regenerated adsorber from adsorbing regeneration gas again in a low-temperature environment, thereby increasing the regeneration depth and solving the problem of low regeneration depth in hydrogen adsorption purification in the prior art.

[0018] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device in this invention.

[0020] Figure 2 This is a schematic diagram of the disassembled structure of the device in this invention.

[0021] Figure 3 This is a partial structural schematic diagram of the device in this invention.

[0022] Figure 4 This is a schematic cross-sectional view of the adsorption tank in this invention.

[0023] Figure 5 This is a schematic diagram of the internal structure of the adsorption tank in this invention.

[0024] In the picture: 1. Adsorption tank; 2. Insertion hole; 3. Base; 4. Insertion block; 5. First bolt; 6. Connecting rod; 7. Second bolt; 8. Screw hole; 9. Fixing frame; 10. Fixing plate; 11. Partition mesh; 12. Heat exchange tube; 13. Partition plate; 14. Rotating shaft; 15. Motor. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Reference Figure 1-5 A hydrogen purification and upgrading device includes a raw material gas tank for providing raw materials, an adsorption tank 1 for purification and upgrading, a regeneration gas tank for providing regeneration gas, and a hydrogen tank for providing high-purity hydrogen. At least two adsorption tanks 1 are provided. The adsorption tank 1, the raw material gas tank, the hydrogen tank and the regeneration gas tank are all mounted on a carrier, with one tank corresponding to one carrier. The carriers are detachably connected to each other.

[0027] In a specific embodiment of the present invention, the tank body is an abbreviation for each adsorption tank 1, raw material gas tank, hydrogen tank and regeneration gas tank. Each tank body is installed on a corresponding carrier, and then the carriers are connected to each other to achieve modular setup. One tank body and one carrier form a module. Then, the carriers in each module are spliced ​​together as needed. The tank bodies are connected to each other through corresponding pipelines. This not only makes assembly convenient, but also facilitates the overall transfer later without disassembling the pipelines. At the same time, it is also convenient to add modules later.

[0028] The carrier includes a base 3, an adsorption tank 1, a raw material gas tank, a hydrogen tank, and a regeneration gas tank, which are respectively fixed on the corresponding base 3. The installation method is a detachable connection, which facilitates the replacement of a tank in the future.

[0029] The carrier also includes a fixing frame 9, which is fixedly mounted on the base 3. The fixing frame 9 frames the corresponding tank. With this arrangement, the tank can be protected by the fixing frame, which can play a certain degree of anti-collision effect whether in use, or during transfer or installation.

[0030] The four sides of the base 3 are fixedly provided with plugs 4 and plug holes 2, and the plugs 4 and plug holes 2 on the same side are arranged side by side and matched.

[0031] The base 3 of the adjacent carrier is connected to the base 3 by inserting the insert block 4 into the insert hole 2, and the first bolt 5 is used for limiting.

[0032] During the splicing process, the adjacent surfaces of the two bases 3 are brought together, so that the insert 4 of one base 3 is inserted into the insertion hole 2 of the other base 3, and the insert 4 of the other base 3 is inserted into the insertion hole 2 of the first base 3. Then, the first bolt 5 is used to limit the insertion 4 and the insertion hole 2.

[0033] The fixing frame 9 is a square frame with screw holes 8 at its top. Adjacent fixing frames 9 are connected by connecting rods 6. Both ends of the connecting rods 6 are fixed by screwing second bolts 7 into the corresponding screw holes 8. After the base is assembled, adjacent fixing frames 9 are connected by connecting rods 6 (see reference). Figure 1 This allows for a more stable connection between the various modules, enabling them to be lifted and moved synchronously if relocation is required later, reducing the work of disassembling pipes.

[0034] The adsorption tank 1 is internally equipped with heat exchange tubes 12, and several layers of mesh 11 are arranged on the heat exchange tubes 12. Adsorbent is placed on each layer of mesh 11. The spacing between the meshes 11 is changed by a driving structure. The adsorption tank 1 is also equipped with baffles 13, which have vent holes. The tank wall of the adsorption tank 1 is a hollow double-layer structure. The cavity is used for the flow of heat exchange gas or heat exchange medium (such as water). The heat exchange tubes 12 are multiple tubes forming a cage-like structure (see structural reference). Figure 5 When the mesh 11 is at its minimum spacing, it is in normal working condition, and the adsorbent in each layer can be close to each other for adsorption. When the temperature changes, the spacing between the mesh 11 layers is increased by the driving structure, so that the adsorbent is separated into multiple layers, thereby increasing the heat exchange area and improving the heat exchange efficiency during the heat exchange process. The partition 13 can separate a part of the adsorption tank 1. The separated part is used to increase the airflow circulation space during heat exchange, thereby accelerating the heat exchange work. The working principle of the heat exchange tube 12 is the same as that of the prior art.

[0035] The above setup uses the wall of the adsorption tank 1 for heat exchange, plus the internal heat exchange tubes for heat exchange, and finally increases the heat exchange area by adjusting the spacing of the adsorbent. The combination of these three methods improves the heat exchange efficiency and solves the problem of the long time required for heating and cooling in the adsorption tank 1 in the prior art.

[0036] The number of mesh layers 11 is odd. The driving structure includes a rotating shaft 14, which is rotatably disposed in the middle of the adsorption tank 1. The rotating shaft 14 has several threaded segments with different pitches. The number of threaded segments is one less than the number of mesh layers 11. The middle layer of mesh 11 is rotatably connected to the rotating shaft 14 and fixedly connected to the heat exchange tube 12. The other layers of mesh 11 are respectively threadedly connected to the corresponding threaded segments and slidably connected to the heat exchange tube 12. The rotating shaft 14 is driven by a motor 15. The bottom end of the rotating shaft 14 is rotatably connected to the bottom of the adsorption tank 1, and the top end is rotatably connected to the fixing plate 10. The fixing plate 10 is fixedly connected to the upper inner part of the adsorption tank 1. The motor 15 is fixedly disposed at the outer bottom of the adsorption tank 1, and its output end is connected to the rotating shaft 14.

[0037] In this embodiment, the partition mesh 11 has five layers, and the corresponding threaded section has four segments (see reference). Figure 4 The first threaded section has the same pitch as the fourth threaded section, the second threaded section has the same pitch as the third threaded section, the first threaded section has a larger pitch than the second threaded section, and the threads of the first and fourth threaded sections are opposite in direction. This ensures that when the shaft 14 rotates, the upward movement speed of the first layer of mesh 11 is faster than that of the second layer of mesh 11, thus increasing the distance between them. At the same time, the distance between the second layer of mesh 11 and the middle layer of mesh 11 also increases. The downward movement speed of the fifth layer of mesh 11 is faster than that of the fourth layer of mesh 11, thus increasing the distance between them. At the same time, the distance between the fourth layer of mesh 11 and the middle layer of mesh 11 also increases, thereby achieving the effect of changing the distance between each mesh 11.

[0038] A hydrogen purification process includes the following steps: Step 1: After heating the raw hydrogen gas, send it to the deoxygenator for deoxygenation; Step 2: The deoxygenated raw hydrogen is sent to the raw material gas tank for storage. Step 3: The raw material gas enters one of the adsorption tanks 1 from the raw material gas tank for adsorption and purification, and then the product gas is discharged from the outlet. Step 4: When the adsorbent in adsorption tank 1 from step 3 is saturated, regeneration gas is introduced for desorption, and at this time, another adsorption tank 1 performs adsorption operations. Step 5: After desorption in step 4, high-purity hydrogen from the hydrogen tank is introduced into adsorption tank 1 to discharge the regeneration gas and prepare for the next adsorption. Step 6: Repeat the above steps through at least two adsorption tanks 1.

[0039] The deaerator in step one is a deaerator equipped with a palladium catalyst. After the raw material hydrogen is heated, it is sent into the deaerator, where water vapor is generated under the action of the catalyst. After condensation, the oxygen is removed.

[0040] The raw material gas tank is connected to each adsorption tank 1 by pipelines and is opened and closed by valves. The adsorption tank 1 is filled with adsorbent, which is made of existing conventional materials. The adsorption tank 1 can be a pressure swing adsorption tank 1. During adsorption, the raw gas in the raw gas tank enters one of the adsorption tanks 1 through a pipeline for adsorption and purification. Then, the product gas is discharged from the outlet of adsorption tank 1. During discharge, part of the product gas is sent to the next process, and the other part is stored in the hydrogen tank. Adsorption tank 1 and the hydrogen tank are connected by a pipeline and controlled by a valve. When adsorption tank 1 is saturated, desorption begins. By changing the temperature inside adsorption tank 1 and then introducing regeneration gas, the impurities adsorbed in the adsorbent are desorbed. Then, high-purity hydrogen from the hydrogen tank is introduced into adsorption tank 1 to discharge the regeneration gas. Because the hydrogen introduced at this time has a high purity, the adsorbent will not adsorb again or will adsorb less, achieving a more thorough desorption effect. After desorption, raw gas is introduced into adsorption tank 1 again for adsorption and discharge of the aforementioned hydrogen. The process is then repeated. Since at least two adsorption tanks 1 are provided, they can be used alternately in a cycle, one for adsorption and one for regeneration, thus achieving continuous production.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydrogen purification and enhancement device, characterized in that, The system includes a raw material gas tank for providing raw materials, an adsorption tank (1) for purification, a regeneration gas tank for providing regeneration gas, and a hydrogen tank for providing high-purity hydrogen. At least two adsorption tanks (1) are provided. The adsorption tank (1), raw material gas tank, hydrogen tank, and regeneration gas tank are all mounted on a support frame, with one tank corresponding to one support frame. The support frames are detachably connected. A heat exchange tube (12) is provided inside the adsorption tank (1). Several layers of mesh (11) are provided on the heat exchange tube (12), and each layer of mesh (11) contains adsorbent. The spacing between the meshes (11) is changed by a driving structure. A partition plate (13) is also provided inside the adsorption tank (1). The partition plate (13) has pores. The number of mesh (11) layers is odd. The driving structure includes a rotating shaft (14), which is rotatably mounted. In the inner middle of the adsorption tank (1), the rotating shaft (14) is provided with several threaded segments with different pitches. The number of threaded segments is one less than the number of layers of the partition (11). The partition (11) in the middle layer is rotatably connected to the rotating shaft (14) and fixedly connected to the heat exchange tube (12). The other layers of partition (11) are threadedly connected to the corresponding threaded segments and slidably connected to the heat exchange tube (12). The rotating shaft (14) is driven by a motor (15). The heat exchange tube (12) is a cage-like structure composed of multiple tubes. Each layer of partition (11) is in normal use when the spacing is at its minimum. Each layer of adsorbent can be close to each other for adsorption. When the temperature is changed, the spacing between each layer of partition (11) is increased by the driving structure, so that the adsorbent is separated into multiple layers, so that the heat exchange area can be increased and the heat exchange efficiency can be improved during the heat exchange process.

2. The hydrogen purification and upgrading device according to claim 1, characterized in that, The carrier includes a base (3), and the adsorption tank (1), raw material gas tank, hydrogen tank and regeneration gas tank are respectively fixedly installed on the corresponding base (3).

3. The hydrogen purification and upgrading device according to claim 2, characterized in that, The carrier also includes a fixing frame (9), which is fixedly mounted on the base (3) and frames the corresponding tank.

4. The hydrogen purification and upgrading device according to claim 2, characterized in that, The base (3) has four fixed inserts (4) and insert holes (2) on its four sides. The inserts (4) and insert holes (2) on the same side are arranged side by side and match each other.

5. The hydrogen purification and upgrading device according to claim 4, characterized in that, The base (3) of the adjacent carrier is inserted into the socket (2) by inserting a plug (4) and is limited by the first bolt (5).

6. The hydrogen purification and upgrading device according to claim 3, characterized in that, The fixing frame (9) is a square frame with a screw hole (8) at the top. Two adjacent fixing frames (9) are connected by a connecting rod (6). Both ends of the connecting rod (6) are fixed by screwing the second bolt (7) into the corresponding screw hole (8).

7. A hydrogen purification process for a hydrogen purification apparatus according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: After heating the raw hydrogen gas, send it to the deoxygenator for deoxygenation; Step 2: The deoxygenated raw hydrogen is sent to the raw material gas tank for storage. Step 3: The raw material gas enters one of the adsorption tanks (1) from the raw material gas tank for adsorption and purification, and then the product gas is discharged from the outlet; Step 4: When the adsorbent in the adsorption tank (1) of Step 3 is saturated, regeneration gas is introduced for desorption, and at this time another adsorption tank (1) performs adsorption operation. Step 5: After desorption in step 4, high-purity hydrogen from the hydrogen tank is introduced into the adsorption tank (1) to discharge the regeneration gas and prepare for the next adsorption. Step 6: Repeat the above steps through at least two adsorption tanks (1).

8. The hydrogen purification and refining process according to claim 7, characterized in that, The deaerator in step one is a deaerator equipped with a palladium catalyst.

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