Hydrogen purification equipment suitable for off-network hydrogen production ammonia alcohol

Abstract

The invention discloses hydrogen purification equipment suitable for off-network hydrogen production ammonia alcohol, relates to the technical field of hydrogen purification equipment, and aims to solve the problems that in a coastal off-network hydrogen production project, when fresh water is adopted for cooling, the operation and maintenance cost is high, after seawater cooling, a heat exchanger is corroded and leaked after six months, the replacement cost is high, and the service life is long. In order to solve the problems in the prior art that an electrolytic antifouling device and a seawater filtering device are installed on one side of a heat exchanger, a membrane assembly is installed in a membrane separation device, and a cleaning, discharging and spraying driving lead screw is installed on the inner wall of one side of the membrane separation device. A limiting frame is installed on the inner wall of the other side of the membrane separation device, a washing row spray is installed between a cleaning row spray driving lead screw and the limiting frame, and a filtering device cleaning mechanism is installed between the outer portion of a filtering net and the inner portion of the seawater filtering device.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrogen purification equipment, in particular to hydrogen purification equipment suitable for off-grid hydrogen ammonia alcohol. BACKGROUND

[0002] In the off-grid hydrogen ammonia alcohol scenario, the integrated hydrogen purification equipment based on metal membrane separation technology is the core solution. This kind of equipment highly integrates hydrogen production and purification process, and is suitable for energy fluctuation and space limitation in off-grid environment with compact and efficient design, and meets the strict requirements of downstream processes such as ammonia synthesis and methanol on hydrogen purity. The metal membrane separation technology utilizes the size-selective permeation characteristics of hydrogen molecules to realize purification. Under high temperature and high pressure conditions, after the hydrogen-containing mixed gas enters the membrane assembly, the hydrogen molecules penetrate the metal membrane through the adsorption-diffusion mechanism, while the impurities such as CO, CO2, H2O and residual ammonia are intercepted. The equipment adopts a containerized integrated design, integrates hydrogen production and purification links in a single unit, and the occupied area is reduced by more than 60% compared with traditional PSA equipment. The driving force of metal membrane separation is mainly temperature gradient rather than external power, which is highly compatible with the volatility of off-grid renewable energy. The metal membrane with the characteristics of anti-pollution and long service life has strong resistance to poisons such as CO and residual ammonia. In contrast, traditional PSA relies on multi-tower switching and adsorbent regeneration, which is prone to performance degradation due to maintenance difficulties in off-grid environment.

[0003] The hydrogen purification equipment and ammonia production system disclosed by Chinese Patent No. CN223263562U relate to the technical field of hydrogen purification, wherein the hydrogen purification equipment comprises an air separation device, a hydrogen production device, a heat exchange part, and a filter part. The air separation device has a refrigerant discharge pipe. The hydrogen production device has a hydrogen discharge pipe. The heat exchange part has a refrigerant inlet end, a hydrogen inlet end, and a hydrogen outlet end. The refrigerant discharge pipe is connected to the refrigerant inlet end, and the hydrogen discharge pipe is connected to the hydrogen inlet end. The refrigerant discharge pipe and the hydrogen discharge pipe can exchange heat. The filter has an inlet end and an outlet end that are connected to each other. The inlet end is connected to the hydrogen outlet end. The technical solution improves the utilization rate of hydrogen.

[0004] The existing technical solution has the following defects: in the off-grid hydrogen production project, the water fee accounts for a high proportion of the operation and maintenance cost when fresh water is used for cooling. After seawater cooling, the heat exchanger will corrode and leak in six months, which requires high replacement cost. In addition, the shellfish and algae in seawater adhere to the inner wall of the heat exchange tube and need to be cleaned once a month, so the hydrogen purification equipment suitable for off-grid hydrogen ammonia alcohol is proposed to solve the problems mentioned above. SUMMARY

[0005] The present application aims to provide a hydrogen purification device suitable for off-grid hydrogen production, to solve the problems of high water cost in the operation and maintenance of off-grid hydrogen production projects in coastal areas, corrosion and leakage of heat exchangers after seawater cooling, and the need to clean the heat exchanger tubes once a month due to the attachment of shellfish and algae.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a hydrogen purification device suitable for off-grid hydrogen production, comprising a raw gas filtering device, an ammonia absorption tower is installed on one side of the raw gas filtering device, an amine liquid absorption tower is installed on one side of the ammonia absorption tower, a heat exchanger is installed on one side of the amine liquid absorption tower, a membrane separation device is installed on one side of the heat exchanger, an electrolytic anti-fouling device and a seawater filtering device are installed on one side of the heat exchanger, a plurality of first ultrasonic generators are symmetrically and equidistantly installed on both sides of the outer wall of the heat exchanger, a plurality of second ultrasonic generators are symmetrically and equidistantly installed on both sides of the outer wall of the membrane separation device, a membrane assembly is installed in the membrane separation device, a cleaning and blowing driving lead screw is installed on the inner wall of one side of the membrane separation device, a limiting frame is installed on the inner wall of the other side of the membrane separation device, a flushing and blowing device is installed between the cleaning and blowing driving lead screw and the limiting frame, the inner diameter of the flushing and blowing device is greater than the diameter of the membrane assembly, a filter screen is installed in the seawater filtering device, and a filtering device cleaning mechanism is installed between the outside of the filter screen and the inside of the seawater filtering device.

[0007] Preferably, a raw gas inlet pipe is sealingly installed at the gas inlet end of the raw gas filtering device, and an ammonia absorption tower inlet pipe is sealingly installed between the gas outlet end of the raw gas filtering device and the gas inlet end of the ammonia absorption tower.

[0008] Preferably, an absorption tower gas conveying pipe is sealingly installed between the gas outlet end of the ammonia absorption tower and the gas inlet end of the amine liquid absorption tower, and an amine liquid absorption tower gas outlet pipe is sealingly installed between the gas outlet end of the amine liquid absorption tower and the gas inlet end of the heat exchanger.

[0009] Preferably, a membrane separation device inlet pipe is sealingly installed between the gas inlet end of one side of the membrane separation device and the gas outlet end of the heat exchanger, a membrane separation device gas conveying pipe is sealingly installed between the gas outlet end of one side of the membrane separation device and the gas inlet end of the other side of the membrane separation device, and a membrane separation device gas outlet pipe is sealingly installed at the gas outlet end of the other side of the membrane separation device.

[0010] Preferably, a seawater conveying pipe is sealingly installed at the water inlet end of the seawater filtering device, a seawater connecting pipe is sealingly installed between the water outlet end of the seawater filtering device and the water inlet end of the electrolytic anti-fouling device, and a heat exchanger seawater inlet pipe is sealingly installed between the water outlet end of the electrolytic anti-fouling device and the water inlet end of the heat exchanger.

[0011] Preferably, the outlet end of the heat exchanger is sealingly installed with an online turbidity meter, the lower end of the gas delivery pipe of the membrane separation device is sealingly connected with the upper surface of the membrane assembly, one side of the upper end of the membrane separation device is fixedly installed with a flushing water pipe, and the lower end of the flushing water pipe is sealingly connected with the flushing nozzle through a corrugated pipe.

[0012] Preferably, the outer transmission of the cleaning nozzle drive screw rod is fixedly installed with a cleaning nozzle drive sliding block, the outer side of the limiting frame is slidingly installed with a limiting frame sliding block, the cleaning nozzle drive sliding block and the limiting frame sliding block are respectively fixedly connected with the flushing nozzle, the inner side of the flushing nozzle is sealingly installed with a cleaning nozzle, and a nozzle strip-shaped water outlet is formed at the middle position of the cleaning nozzle.

[0013] Preferably, the upper end of the raw gas filtering device and the seawater filtering device is fixedly installed with a filtering device cleaning mechanism motor, and the output end of the filtering device cleaning mechanism motor is drivingly connected with a drive shaft through a shaft coupling.

[0014] Preferably, the filtering device cleaning mechanism comprises a driving frame, a silica gel scraping strip, a filtering device inner wall scraping rod and a filter screen scraping rod, the driving frame is located at the upper end of the filtering device cleaning mechanism, the filtering device inner wall scraping rod is fixedly installed on the outer side below the driving frame, and the filter screen scraping rod is fixedly installed on the inner side below the driving frame.

[0015] Preferably, the outer side of the filtering device inner wall scraping rod and the inner side of the filter screen scraping rod are fixedly attached with silica gel scraping strips, the silica gel scraping strip of the filtering device inner wall scraping rod is attached with the inner wall of the membrane separation device, and the silica gel scraping strip of the filter screen scraping rod is attached with the outer surface of the filter screen.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The seawater sucked by the present application is filtered by the seawater filtering device to remove impurities and organisms, and then chlorine gas is generated by electrolysis in the electrolytic antifouling device to inhibit the growth of organisms, so that the cooling medium entering the heat exchanger can be effectively purified to avoid the adhesion of seawater impurities and organisms to the inner wall of the heat exchanger; at the same time, the regular cleaning of the first ultrasonic generator and the real-time monitoring and parameter linkage adjustment of the online turbidity meter form an integrated heat exchanger antifouling system, which maintains the long-term stable heat exchange efficiency of the heat exchanger, ensures that the temperature regulation effect of the raw gas meets the standard, and avoids the influence of heat exchange failure on the subsequent membrane separation and purification effect. The deep cleaning program of the heat exchanger is started every month, which can comprehensively and deeply clean the heat exchanger tube through the combination of electrolysis to generate high-concentration hydrogen gas and high-pressure water flushing, completely removes stubborn scale and biological residues that cannot be removed by conventional cleaning, further guarantees the long-term operation performance of the heat exchanger, reduces the equipment downtime for maintenance caused by serious scaling, and improves the continuous operation capability of the equipment in off-grid scenarios.

[0018] 2. When the membrane separation device of the present application is cleaned, the flushing row jet can stably move under the cooperation of the cleaning row jet drive screw rod and the limiting frame, and combined with the cleaning water sprayed by the nozzle strip-shaped water outlet, the membrane module is fully covered and flushed, and after the water overflows the membrane module, the second ultrasonic generator is opened for auxiliary cleaning, which can efficiently strip the fine impurities and pollutants adsorbed on the surface of the membrane module and the inner wall of the device, avoid the separation performance decline caused by the blockage of the membrane module, reduce the replacement frequency of the membrane module, and reduce the operation and maintenance cost of the equipment in the off-grid scene. The flushing water pipe and the flushing row jet in the membrane separation device are connected through the corrugated pipe, which not only ensures the sealing of the cleaning water transmission process, but also provides flexible deformation space for the up and down movement of the flushing row jet, avoids the damage of the pipeline caused by the movement of the flushing row jet, and improves the structural reliability and service life of the cleaning system.

[0019] 3. The cleaning of the raw material gas filtering device and the seawater filtering device is realized through the filtering device cleaning mechanism, the motor drives the drive shaft and the drive frame to drive the filter wall scraper and the filter screen scraper to rotate synchronously, and the impurities are scraped off by the silica gel scraper, so that the cleaning operation can be completed without disassembling the device, the operation and maintenance process is greatly simplified, the requirement for the professional skills of the operation and maintenance personnel is reduced, and the flexible material of the silica gel scraper can avoid scratching the inner wall of the device and the filter screen, considering the cleaning effect and component protection. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the front view of the present application;

[0021] Figure 2 is a structural schematic view of the membrane separation device in the present application;

[0022] Figure 3 is a partial enlarged view of A area in the present application; Figure 2

[0023] Figure 4 is a structural schematic view of the seawater filtering device in the present application;

[0024] Figure 5 is a partial enlarged view of B area in the present application; Figure 4

[0025] ​​In the figure: 1, raw gas filtering device; 2, ammonia absorption tower; 3, amine liquid absorption tower; 4, heat exchanger; 5, membrane separation device; 6, electrolytic anti-fouling device; 7, seawater filtering device; 8, raw gas inlet pipe; 9, ammonia absorption tower inlet pipe; 10, absorption tower gas conveying pipe; 11, amine liquid absorption tower gas outlet pipe; 12, heat exchanger seawater inlet pipe; 13, seawater connecting pipe; 14, seawater conveying pipe; 15, membrane separation device inlet pipe; 16, membrane separation device gas conveying pipe; 17, membrane separation device gas outlet pipe; 18, first ultrasonic generator; 19, second ultrasonic generator; 20, membrane assembly; 21, cleaning exhaust spray driving lead screw; 22, flushing exhaust spray; 23, flushing water pipe; 24, corrugated pipe; 25, limiting frame; 26, cleaning exhaust spray driving sliding block; 27, cleaning nozzle; 28, nozzle strip water outlet; 29, filter screen; 30, filter device cleaning mechanism motor; 31, filter device cleaning mechanism; 32, driving shaft; 33, driving frame; 34, silica gel scraping strip; 35, filter device inner wall scraping rod; 36, filter screen scraping rod; 37, online turbidity meter. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0027] Please refer to Figures 1-5 An embodiment provided by the present application: a hydrogen purification equipment suitable for off-grid hydrogen ammonia alcohol, comprising a raw gas filtering device 1, an ammonia absorption tower 2 is installed on one side of the raw gas filtering device 1, an amine liquid absorption tower 3 is installed on one side of the ammonia absorption tower 2, a heat exchanger 4 is installed on one side of the amine liquid absorption tower 3, a membrane separation device 5 is installed on one side of the heat exchanger 4, an electrolytic anti-fouling device 6 and a seawater filtering device 7 are installed on one side of the heat exchanger 4, a plurality of first ultrasonic generators 18 are symmetrically and equidistantly installed on both sides of the outer wall of the heat exchanger 4, a plurality of second ultrasonic generators 19 are symmetrically and equidistantly installed on both sides of the outer wall of the membrane separation device 5, a membrane assembly 20 is installed in the membrane separation device 5, a cleaning exhaust spray driving lead screw 21 is installed on the inner wall of one side of the membrane separation device 5, a limiting frame 25 is installed on the inner wall of the other side of the membrane separation device 5, a flushing exhaust spray 22 is installed between the cleaning exhaust spray driving lead screw 21 and the limiting frame 25, the inner diameter of the flushing exhaust spray 22 is greater than the diameter of the membrane assembly 20, a filter screen 29 is installed in the seawater filtering device 7, and a filter device cleaning mechanism 31 is installed between the outside of the filter screen 29 and the inside of the seawater filtering device 7.

[0028] The complete process from raw gas pretreatment to hydrogen purification is constructed, realizing the step-by-step purification of the raw gas; the electrolytic anti-fouling device 6, the seawater filtering device 7, the first ultrasonic generator 18 and the second ultrasonic generator 19 can respectively solve the biological attachment problems of the heat exchanger and the membrane separation device; the cleaning structure composed of the clean discharge spray driving screw rod 21, the limiting frame 25 and the flushing discharge spray 22 and the filtering device cleaning mechanism 31 and the filter screen 29 can provide reliable cleaning guarantee for the core components, and the overall structural layout takes into account the purification efficiency and maintenance convenience, providing support for the stable operation of the equipment in the off-grid hydrogen ammonia alcohol scene.

[0029] Please refer to Figure 1 , the raw gas inlet pipe 8 is sealingly installed at the gas inlet end of the raw gas filtering device 1, the ammonia absorption tower inlet pipe 9 is sealingly installed between the gas outlet end of the raw gas filtering device 1 and the gas inlet end of the ammonia absorption tower 2, the absorption tower gas conveying pipe 10 is sealingly installed between the gas outlet end of the ammonia absorption tower 2 and the gas inlet end of the amine liquid absorption tower 3, and the amine liquid absorption tower gas outlet pipe 11 is sealingly installed between the gas outlet end of the amine liquid absorption tower 3 and the gas inlet end of the heat exchanger 4. The membrane separation device gas inlet pipe 15 is sealingly installed between the gas outlet end of the heat exchanger 4 and the gas inlet end of one side of the membrane separation device 5, the membrane separation device gas conveying pipe 16 is sealingly installed between the gas outlet end of one side of the membrane separation device 5 and the gas inlet end of the other side of the membrane separation device 5, and the membrane separation device gas outlet pipe 17 is sealingly installed at the gas outlet end of the other side of the membrane separation device 5. The seawater conveying pipe 14 is sealingly installed at the water inlet end of the seawater filtering device 7, the seawater connecting pipe 13 is sealingly installed between the water outlet end of the seawater filtering device 7 and the water inlet end of the electrolytic anti-fouling device 6, and the heat exchanger seawater inlet pipe 12 is sealingly installed between the water outlet end of the electrolytic anti-fouling device 6 and the water inlet end of the heat exchanger 4.

[0030] The sealing installation of the membrane separation device gas outlet pipe 17 and the seawater conveying pipe 14, the seawater connecting pipe 13 and the heat exchanger seawater inlet pipe 12 not only can effectively prevent the leakage of raw gas, hydrogen and seawater, avoid raw material loss, hydrogen purity decline and environmental pollution, but also can ensure the continuity and stability of the transmission of gas and liquid between devices, realize the efficient connection of each link of the purification process.

[0031] Please refer to Figures 1-3The outlet end of the heat exchanger 4 is sealingly installed with an online turbidity meter 37, the lower end of the gas delivery pipe 16 of the membrane separation device is sealingly connected with the upper surface of the membrane assembly 20, one side of the upper end of the membrane separation device 5 is fixedly installed with a flushing water pipe 23, and the lower end of the flushing water pipe 23 is sealingly connected with the flushing nozzle 22 through the corrugated pipe 24. The outer drive of the cleaning nozzle drive lead screw 21 is sealingly installed with a cleaning nozzle drive sliding block 26, the outer side of the limiting frame 25 is slidingly installed with a limiting frame sliding block, the cleaning nozzle drive sliding block 26 and the limiting frame sliding block are respectively fixedly connected with the flushing nozzle 22, the inner side of the flushing nozzle 22 is sealingly installed with a cleaning nozzle 27, and the middle position of the cleaning nozzle 27 is provided with a nozzle strip-shaped water outlet 28.

[0032] The online turbidity meter 37 of the outlet end of the heat exchanger 4 can feedback the seawater turbidity in real time, providing a basis for timely adjustment of anti-pollution measures; the sealing connection of the gas delivery pipe 16 of the membrane separation device and the membrane assembly 20 can ensure the full contact of the gas with the membrane assembly, improving the separation effect; the flushing water pipe 23 is connected with the flushing nozzle 22 through the corrugated pipe 24, which can adapt to the movement demand of the flushing nozzle; the cleaning nozzle drive lead screw 21 cooperates with the limiting frame 25 to realize the stable movement of the flushing nozzle; the nozzle strip-shaped water outlet 28 of the cleaning nozzle 27 can perform omnidirectional flushing on the membrane assembly 20, significantly enhancing the cleaning effect of the membrane assembly 20 and ensuring the membrane separation efficiency.

[0033] Please refer to Figures 4-5 The upper end of the raw gas filtering device 1 and the seawater filtering device 7 is fixedly installed with a filtering device cleaning mechanism motor 30, and the output end of the filtering device cleaning mechanism motor 30 is drivingly connected with a drive shaft 32 through a shaft coupling. The filtering device cleaning mechanism 31 comprises a driving frame 33, a silica gel scraping strip 34, a filtering device inner wall scraping rod 35 and a filter screen scraping rod 36. The driving frame 33 is located at the upper end of the filtering device cleaning mechanism 31. The outer side of the driving frame 33 below is fixedly installed with the filtering device inner wall scraping rod 35, and the inner side of the driving frame 33 below is fixedly installed with the filter screen scraping rod 36. The outer side of the filtering device inner wall scraping rod 35 and the inner side of the filter screen scraping rod 36 are fixedly attached with the silica gel scraping strip 34. The silica gel scraping strip 34 of the filtering device inner wall scraping rod 35 is attached with the inner wall of the membrane separation device 5, and the silica gel scraping strip 34 of the filter screen scraping rod 36 is attached with the outer surface of the filter screen 29.

[0034] The filtering device cleaning mechanism motor 30 at the upper end of the raw gas filtering device 1 and the seawater filtering device 7 drives the driving frame 33 to rotate through the drive shaft 32, driving the filtering device inner wall scraping rod 35 and the filter screen scraping rod 36 to rotate synchronously. The design that the silica gel scraping strip 34 is attached with the device inner wall and the filter screen 29 can efficiently scrape off impurities and avoid damaging equipment components, realizing the automatic cleaning of the filtering device, without the need for manual disassembly and maintenance, reducing the maintenance difficulty and cost, and continuously maintaining the filtering performance of the filtering device, ensuring the pretreatment effect of the raw gas and seawater.

[0035] Working principle: in use, the raw material gas is input into the raw material gas filter device 1 through the raw material gas inlet pipe 8 to remove solid particles and liquid oil droplets in the raw material gas, the ammonia alcohol by-product hydrogen is removed through the ammonia absorption tower inlet pipe 9 into the ammonia absorption tower 2, the carbon dioxide is removed through the absorption tower gas pipe 10 into the amine liquid absorption tower 3, and then the heat exchanger 4 is adjusted to adjust the temperature of the raw material gas, and then the membrane separation device inlet pipe 15 is input into the two membrane separation devices 5, the seawater is injected into the seawater filter device 7 through the seawater conveying pipe 14, the filter screen 29 of the seawater filter device 7 filters the impurities and organisms in the seawater, and then the seawater is transmitted to the electrolytic antifouling device 6 through the seawater connecting pipe 13, the electrolytic antifouling device 6 uses a titanium-based electrode to electrolyze seawater to generate chlorine gas to inhibit biological growth, a first ultrasonic generator 18 is installed outside the heat exchanger 4, the power of the first ultrasonic generator 18 is 500W, the frequency is 20kHz, and the working time is 10 minutes per hour, and the attached organisms are removed, and the turbidity of the seawater at the outlet of the heat exchanger 4 is monitored by the online turbidity meter, which reflects the degree of biological attachment. When the turbidity detected by the turbidity meter is greater than or equal to 20NTU, it is prompted that the biological attachment is increased, and the current density is increased to 15mA / cm 2 At the same time, the ultrasonic working time is extended to 15 minutes per hour; a deep cleaning program is started once a month: first, high-concentration hydrogen gas is generated by electrolysis, and then the heat exchanger 4 is cleaned by circulating for 30 minutes. When cleaning the membrane separation device 5, the cleaning water enters the corrugated pipe 24 through the flushing water pipe 23, and then is transmitted to the flushing nozzle 22 through the nozzle strip-shaped water outlet 28, and at the same time, the cleaning nozzle drive screw 21 is started, the cleaning nozzle drive screw 21 drives the cleaning nozzle drive sliding block 26 to move downward, so that the flushing nozzle 22 slides downward along the cleaning nozzle drive screw 21 and the limiting frame 25, and the water sprayed out of the nozzle strip-shaped water outlet 28 cleans the membrane assembly 20. When the water overflows the membrane assembly 20, the second ultrasonic generator 19 is started to perform ultrasonic cleaning for 30 minutes to remove the impurities adsorbed on the surface of the membrane assembly 20 and the inner wall of the membrane separation device 5. When cleaning the raw material gas filter device 1 and the seawater filter device 7, the filter device cleaning mechanism motor 30 is started, the output end of the filter device cleaning mechanism motor 30 drives the driving shaft 32 to rotate, the driving shaft 32 drives the driving frame 33 to rotate, and the driving frame 33 drives the filter device inner wall scraping rod 35 and the filter screen scraping rod 36 to rotate synchronously, so that the silica gel scraping strip 34 removes the impurities on the inner wall of the seawater filter device 7 and the surface of the filter screen 29.

[0036] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A hydrogen purification device suitable for off-grid hydrogen production of ammonia and alcohol, comprising a raw gas filtration device (1), an ammonia absorption tower (2) installed on one side of the raw gas filtration device (1), an amine liquid absorption tower (3) installed on one side of the ammonia absorption tower (2), a heat exchanger (4) installed on one side of the amine liquid absorption tower (3), and a membrane separation device (5) installed on one side of the heat exchanger (4), characterized in that: An electrolytic antifouling device (6) and a seawater filtration device (7) are installed on one side of the heat exchanger (4). Multiple first ultrasonic generators (18) are symmetrically and equidistantly installed on both sides of the outer wall of the heat exchanger (4). Multiple second ultrasonic generators (19) are symmetrically and equidistantly installed on both sides of the outer wall of the membrane separation device (5). A membrane module (20) is installed inside the membrane separation device (5). A cleaning exhaust spray drive screw (21) is installed on the inner wall of one side of the membrane separation device (5). A limit frame (25) is installed on the inner wall of the other side of the membrane separation device (5). A flushing exhaust spray (22) is installed between the cleaning exhaust spray drive screw (21) and the limit frame (25). The inner diameter of the flushing exhaust spray (22) is larger than the diameter of the membrane module (20). A filter screen (29) is installed inside the seawater filtration device (7). A filter cleaning mechanism (31) is installed between the outside of the filter screen (29) and the inside of the seawater filtration device (7).

2. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: The raw gas filter device (1) is sealed with a raw gas inlet pipe (8) at its inlet end, and an ammonia absorption tower inlet pipe (9) is sealed between the outlet end of the raw gas filter device (1) and the inlet end of the ammonia absorption tower (2).

3. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: An absorption tower gas delivery pipe (10) is sealed between the outlet end of the ammonia absorption tower (2) and the inlet end of the amine absorption tower (3), and an amine absorption tower outlet pipe (11) is sealed between the outlet end of the amine absorption tower (3) and the inlet end of the heat exchanger (4).

4. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: A membrane separator inlet pipe (15) is sealed between the outlet end of the heat exchanger (4) and the inlet end of one side membrane separator (5). A membrane separator gas delivery pipe (16) is sealed between the outlet end of one side membrane separator (5) and the inlet end of the other side membrane separator (5). A membrane separator outlet pipe (17) is sealed between the outlet end of the other side membrane separator (5).

5. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: The seawater filtration device (7) is sealed with a seawater delivery pipe (14) at its inlet end. A seawater connection pipe (13) is sealed between the outlet end of the seawater filtration device (7) and the inlet end of the electrolytic antifouling device (6). A seawater inlet pipe (12) for the heat exchanger is sealed between the outlet end of the electrolytic antifouling device (6) and the inlet end of the heat exchanger (4).

6. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: An online turbidity meter (37) is sealed at the outlet of the heat exchanger (4). The lower end of the gas delivery pipe (16) of the membrane separation device is sealed to the upper surface of the membrane module (20). A flushing water pipe (23) is fixedly installed on one side of the upper end of the membrane separation device (5). The lower end of the flushing water pipe (23) is sealed to the flushing exhaust spray (22) through a corrugated pipe (24).

7. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: The external drive of the cleaning exhaust spray drive screw (21) is equipped with a cleaning exhaust spray drive slider (26), and the external sliding of the limiting frame (25) is equipped with a limiting frame sliding block. The cleaning exhaust spray drive slider (26) and the limiting frame sliding block are respectively fixedly connected to the flushing exhaust spray (22). The inner side of the flushing exhaust spray (22) is sealed with a cleaning nozzle (27), and a nozzle strip outlet (28) is opened at the middle position of the cleaning nozzle (27).

8. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: The filter cleaning mechanism motor (30) is fixedly installed above both the raw gas filter (1) and the seawater filter (7). The output end of the filter cleaning mechanism motor (30) is connected to the drive shaft (32) through a coupling.

9. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 1, characterized in that: The filter cleaning mechanism (31) includes a drive frame (33), a silicone scraper (34), a filter inner wall scraper (35), and a filter screen scraper (36). The drive frame (33) is located at the upper end of the filter cleaning mechanism (31). The filter inner wall scraper (35) is fixedly installed on the outer side below the drive frame (33), and the filter screen scraper (36) is fixedly installed on the inner side below the drive frame (33).

10. The hydrogen purification equipment for off-grid hydrogen production of ammonia and alcohol according to claim 9, characterized in that: Silicone scraper strips (34) are fixedly attached to the outer side of the inner wall scraper (35) of the filter device and the inner side of the filter screen scraper (36). The silicone scraper strips (34) of the inner wall scraper (35) of the filter device are attached to the inner wall of the membrane separation device (5), and the silicone scraper strips (34) of the filter screen scraper (36) are attached to the outer surface of the filter screen (29).

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