Pretreatment device for ammonia cracking hydrogen production

Abstract

The utility model discloses a pretreatment device for ammonia cracking hydrogen production, and belongs to the technical field of pretreatment devices. The device comprises a liquid storage tank assembly, a cover plate assembly, an electric heating rod, a filtering assembly and a base, the liquid storage tank assembly comprises a liquid storage tank, a threaded groove is formed in the top of the liquid storage tank, the cover plate assembly comprises a cover plate, an external threaded pipe is fixedly connected to the bottom end face of the cover plate, and the external threaded pipe is in threaded fit with the threaded groove; the electric heating rod is installed on the top end face of the cover plate, the filtering assembly comprises a barrel body filled with a filter element, a threaded groove is formed in the top of the barrel body, a second external threaded pipe is in threaded fit with the interior of the threaded groove, a pressing plate is fixedly connected to the top end of the second external threaded pipe, and a connecting pipe is matched with the bottom of the barrel body. Through integration of direct heating, two-stage filtration and modular design, the device has the advantages of low energy consumption, high hydrogen purity, convenience in operation, safety, reliability and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of pretreatment devices, specifically a pretreatment device for ammonia cracking to produce hydrogen. Background Technology

[0002] Ammonia cracking for hydrogen production is a process that uses high-temperature catalytic decomposition of ammonia to produce hydrogen and nitrogen. Compared with traditional water electrolysis or natural gas reforming for hydrogen production, the advantage of ammonia cracking lies in the high hydrogen content of ammonia. Pretreatment of ammonia cracking for hydrogen production is a key step to ensure that the reaction is efficient and safe. If ammonia contains moisture, it may lead to catalyst poisoning or side reactions, so a pretreatment device is required.

[0003] Ammonia cracking for hydrogen production is a process that obtains high-purity hydrogen by decomposing liquid ammonia. It is widely used in fuel cells, chemical synthesis, and other fields. Existing pretreatment devices often suffer from the following drawbacks:

[0004] 1. Low heating efficiency: Traditional heating methods are separated from the reaction vessel, resulting in large heat conduction losses and high energy consumption.

[0005] 2. Insufficient filtration effect: Single-stage filtration is difficult to effectively remove residual ammonia or solid impurities in cracked gas, affecting the purity of hydrogen.

[0006] 3. Inconvenient maintenance: The connection structure between the liquid storage tank and the cover plate is complex, making disassembly difficult, and it lacks a pressure regulation mechanism, posing a safety hazard. Utility Model Content

[0007] The purpose of this invention is to provide a pretreatment device for hydrogen production from ammonia cracking. This invention solves the problems of low heating efficiency, insufficient filtration and complex maintenance by integrating direct heating, two-stage filtration and modular design.

[0008] This utility model is achieved through the following technical solution:

[0009] This utility model is a pretreatment device for hydrogen production by ammonia cracking, including a storage tank assembly, a cover plate assembly, an electric heating rod, a filter assembly and a base.

[0010] The liquid storage tank assembly includes a liquid storage tank, the top of which has a threaded groove.

[0011] The cover plate assembly includes a cover plate, and an externally threaded pipe is fixedly connected to the bottom end face of the cover plate. The externally threaded pipe is threaded into the threaded groove.

[0012] The electric heating rod is installed on the top surface of the cover plate.

[0013] The filter assembly includes a barrel filled with a filter element. A threaded groove is provided on the top of the barrel, and a second external threaded tube is threaded into the groove. A pressure plate is fixedly connected to the top of the second external threaded tube, and a connecting tube is provided at the bottom of the barrel.

[0014] Furthermore, four fixing blocks are fixedly connected to the outer surface of the liquid storage tank.

[0015] Furthermore, an electric push rod is fixedly connected to the top surface of the base, and the output end of the electric push rod is fixedly connected to the bottom surface of the fixing block.

[0016] Furthermore, there are two filter components, with two air outlets and two through holes respectively opened on the cover plate, and an installation port opened at the center of the cover plate, with a connecting pipe matching the air outlet.

[0017] Furthermore, a feed pipe and a pressure relief pipe are respectively fitted into the two through holes, and a second solenoid valve is fitted onto both the feed pipe and the pressure relief pipe.

[0018] Furthermore, an air pipe is installed through the pressure plate, a first solenoid valve is fitted on the air pipe, a three-way pipe is fitted on the first solenoid valve, and the working end of the electric heating rod is located inside the liquid storage tank, with the working end of the electric heating rod fitting through the installation port.

[0019] This utility model has the following beneficial effects:

[0020] 1. This utility model uses an electric heating rod that is directly embedded inside the liquid storage tank and heated in direct contact with liquid ammonia, avoiding the heat conduction loss of traditional external heating. The filter element is quickly fixed to the pressure plate through a threaded groove.

[0021] 2. This utility model allows for quick connection between the liquid storage tank and the cover plate assembly via a threaded groove and an external threaded pipe. Combined with the electric push rod of the base driving the lifting and lowering, the tank can be lowered with one click, and the cover plate can be easily removed to replace the filter element or clean the electric heating rod.

[0022] 3. This utility model integrates heating, filtering, feeding and pressure relief interfaces through the cover plate, and optimizes the gas flow path by the layout of the air outlet, through hole and connecting pipe, thereby reducing pipeline redundancy.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pretreatment device.

[0025] Figure 2 This is a schematic diagram of the top structure of the pretreatment device;

[0026] Figure 3 This is a schematic diagram of the internal structure of the pretreatment device;

[0027] Figure 4 This is a structural schematic diagram of the cover plate assembly;

[0028] Figure 5 This is a schematic diagram of the liquid storage tank assembly structure;

[0029] Figure 6 This is a schematic diagram of the filter component structure.

[0030] In the diagram: 1. Liquid storage tank assembly; 101. Liquid storage tank; 102. Threaded groove; 103. Fixing block; 2. Cover plate assembly; 201. Cover plate; 202. External threaded pipe; 203. Vent hole; 204. Through hole; 205. Mounting port; 3. Electric heating rod; 4. Filter assembly; 401. Barrel body; 402. Threaded groove; 403. Second external threaded pipe; 404. Pressure plate; 5. Air pipe; 6. First solenoid valve; 7. T-connector; 8. Feed pipe; 9. Second solenoid valve; 10. Pressure relief pipe; 11. Base; 12. Electric push rod. Detailed Implementation

[0031] 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.

[0032] Please see Figure 1-6 This utility model provides a technical solution: a pretreatment device for hydrogen production by ammonia cracking, including a storage tank assembly 1, a cover plate assembly 2, an electric heating rod 3, a filter assembly 4 and a base 11.

[0033] The liquid storage tank assembly 1 includes a liquid storage tank 101. A threaded groove 102 is provided on the top of the liquid storage tank 101. Four fixing blocks 103 are fixedly connected to the outer surface of the liquid storage tank 101. An electric push rod 12 is fixedly connected to the top surface of the base 11. The output end of the electric push rod 12 is fixedly connected to the bottom surface of the fixing block 103. The electric push rod 12 is activated to lower the liquid storage tank 101. The cover plate 201 is unscrewed to replace the filter element or clean the electric heating rod 3.

[0034] The top of the liquid storage tank 101 is provided with a threaded groove 102, which cooperates with the external threaded tube 202 of the cover plate assembly 2 to achieve a sealed connection. The fixing block 103 is linked with the electric push rod 12 to simplify maintenance operations by lifting the liquid storage tank, providing a sealed reaction space and supporting quick disassembly and maintenance. Activate the electric push rod 12 on the base 11 to push the fixing block 103 down to move the liquid storage tank 101, release the threaded connection between the cover plate 201 and the liquid storage tank, and unscrew the pressure plate 404 and the second external threaded tube 403 to quickly replace the filter element in the filter assembly 4.

[0035] The cover plate assembly 2 includes a cover plate 201. An external threaded pipe 202 is fixedly connected to the bottom end surface of the cover plate 201. The external threaded pipe 202 is threaded into the threaded groove 102. A feed pipe 8 and a pressure relief pipe 10 are respectively fitted into two through holes 204. A second solenoid valve 9 is fitted onto both the feed pipe 8 and the pressure relief pipe 10.

[0036] The cover plate 201 integrates the electric heating rod 3, the feed pipe 8, the pressure relief pipe 10, and the filter component interface. The vent 203 and the through hole 204 are respectively connected to the filter component and the external pipeline to centrally manage the flow path of the reaction gas and optimize the space utilization.

[0037] Liquid ammonia is injected into the storage tank 101 through the feed pipe 8. The flow rate is controlled by the second solenoid valve 9. The pressure relief pipe 10 automatically opens when the pressure inside the tank exceeds the limit, directing excess gas into an external recovery system.

[0038] The electric heating rod 3 is installed on the top surface of the cover plate 201. The working end of the electric heating rod 3 is located inside the liquid storage tank 101. The working end of the electric heating rod 3 fits through the mounting port 205. The corrosion-resistant ceramic layer (such as Al2O3) coated on the surface of the working end of the electric heating rod 3 can withstand high-temperature ammonia corrosion. After the electric heating rod 3 is energized, its working end is directly immersed in liquid ammonia, heating the liquid ammonia to 650-800℃ to cause a decomposition reaction.

[0039] 2NH3→3H2+N2

[0040] The liquid ammonia in the storage tank is directly heated, causing it to decompose into a mixture of hydrogen and nitrogen, reducing heat conduction loss, improving heating efficiency, and extending service life due to corrosion resistance.

[0041] The filter assembly 4 includes a barrel 401 filled with a filter element. The barrel 401 is filled with molecular sieve or activated alumina adsorbent. A threaded groove 402 is opened on the top of the barrel 401. A second external threaded tube 403 is threadedly fitted in the threaded groove 402. A pressure plate 404 is fixedly connected to the top of the second external threaded tube 403. A connecting tube 405 is fitted to the bottom of the barrel 401. There are two filter assemblies 4. Two air outlets 203 and two through holes 204 are opened on the cover plate 201 respectively. An installation port 205 is opened at the center of the cover plate 201. The connecting tube 405 is fitted to the air outlets 203. An air pipe 5 is installed through the pressure plate 404. A first solenoid valve 6 is fitted on the air pipe 5. A three-way pipe 7 is fitted on the first solenoid valve 6.

[0042] The pyrolysis gas enters the barrel 401 of the filter assembly 4 through the connecting pipe 405. The filter element molecular sieve or activated alumina adsorbs residual ammonia and impurities. The filtered gas is output through the gas pipe 5. The first solenoid valve 6 regulates the gas flow rate. The three-way pipe 7 can be diverted to different pipelines. If the pressure in the storage tank is too high, the pressure relief pipe 10 will open automatically to introduce the excess gas into the external recovery system. The electric push rod 12 lowers the storage tank 101 and unscrews the cover plate 201 to replace the filter element or clean the electric heating rod 3.

[0043] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pretreatment device for hydrogen production from ammonia cracking, characterized in that, include: A liquid storage tank assembly (1) includes a liquid storage tank (101), and a threaded groove (102) is provided on the top of the liquid storage tank (101); Cover plate assembly (2), the cover plate assembly (2) includes a cover plate (201), and an external threaded tube (202) is fixedly connected to the bottom end surface of the cover plate (201), the external threaded tube (202) being threaded into the threaded groove (102); An electric heating rod (3) is mounted on the top surface of the cover plate (201); The filter assembly (4) includes a barrel (401) filled with a filter element. A threaded groove (402) is provided on the top of the barrel (401). A second external threaded tube (403) is threaded in the threaded groove (402). A pressure plate (404) is fixedly connected to the top of the second external threaded tube (403). A connecting tube (405) is provided at the bottom of the barrel (401).

2. The pretreatment device for ammonia cracking to produce hydrogen according to claim 1, characterized in that: Four fixing blocks (103) are fixedly connected to the outer surface of the liquid storage tank (101).

3. The pretreatment device for ammonia cracking to produce hydrogen according to claim 1, characterized in that: It also includes a base (11), on the top surface of which an electric push rod (12) is fixedly connected, and the output end of the electric push rod (12) is fixedly connected to the bottom surface of a fixing block (103).

4. The pretreatment device for hydrogen production from ammonia cracking according to claim 1, characterized in that: The filter assembly (4) has two parts. The cover plate (201) has two air outlets (203) and two through holes (204) respectively. The cover plate (201) has an installation port (205) at the center. The connecting pipe (405) is fitted to the air outlets (203).

5. A pretreatment device for ammonia cracking to produce hydrogen according to claim 4, characterized in that: The two through holes (204) are respectively fitted with a feed pipe (8) and a pressure relief pipe (10), and a second solenoid valve (9) is fitted on both the feed pipe (8) and the pressure relief pipe (10).

6. The pretreatment device for ammonia cracking to produce hydrogen according to claim 1, characterized in that: An air pipe (5) is provided through the pressure plate (404), and a first solenoid valve (6) is fitted on the air pipe (5). A three-way pipe (7) is fitted on the first solenoid valve (6). The working end of the electric heating rod (3) is located inside the liquid storage tank (101), and the working end of the electric heating rod (3) is fitted through the installation port (205).

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