An oxygen purification and filling system and operation method for a resource recovery type inland river terminal hydrogen production and refueling station

Abstract

The present invention provides an oxygen purification and filling system and operation method of a resource recovery type inland river terminal hydrogen production and hydrogenation station, wherein the raw gas intake system is connected to the raw gas storage tank, the upper part of the raw gas storage tank is connected to the lower part of the dehydrogenator through a connecting pipe, and the upper part of the dehydrogenator is connected to the first oxygen cooler through a connecting pipe; the first oxygen cooler is connected to the first steam-water separator, and the outlet of the first steam-water separator is connected to a drying system for circulating and drying oxygen; the outlet of the drying system is connected to the second oxygen cooler through the first gas outlet main pipe, and the outlet of the drying system is connected to the oxygen storage tank through the second gas outlet main pipe; the top outlet of the second oxygen cooler is connected to the second steam-water separator, and the second steam-water separator is connected to the drying system; the outlet of the oxygen storage tank is connected to a supercharger. This system can be used to separate, purify and dry the oxygen byproducts generated in the hydrogen production process of the inland river terminal.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production and hydrogenation, and in particular to an oxygen purification and filling system and an operation method of a resource recovery type inland river terminal hydrogen production and hydrogenation station. Background Art

[0002] In order to support inland hydrogen fuel cell powered ships, it is necessary to build a hydrogen production and refueling station at the inland dock. At present, the hydrogen refueling station adopted adopts the construction mode of hydrogen production and refueling integrated station. A hydrogen production and refueling station is built in Yangjiawan Wharf on the right bank of the Three Gorges Dam area, with a hydrogen production scale of 200Nm 3 / h, hydrogenation scale 500kg / d. This project provides hydrogenation services for inland hydrogen fuel cell powered ships and tourist buses in the Three Gorges Dam area. The main process of hydrogen production by electrolysis of water is adopted. During the hydrogen production process, the cathode and anode surfaces of each electrolysis chamber will produce hydrogen and oxygen respectively. The gas produced from the electrolysis chamber will carry pure water vapor and flow into their respective airways through the hydrogen and oxygen outlets above each plate for convergence. After being uniformly gathered and collected by the hydrogen and oxygen gas chambers, they will flow into the gas separation system through the hydrogen pipeline and oxygen pipeline respectively.

[0003] At present, hydrogen production stations in the industry usually only recycle hydrogen, while the oxygen byproducts produced are directly discharged. This results in a waste of resources. Therefore, it is necessary to design a corresponding system to effectively recycle the oxygen byproducts produced during the hydrogen production process in order to achieve the effect of resource reuse. Summary of the invention

[0004] In order to solve the current technical problems, the main purpose of the present invention is to provide an oxygen purification and filling system and operation method for a resource recovery type inland river terminal hydrogen production and refueling station. This system can be used to separate, purify and dry the oxygen by-products produced during the hydrogen production process at the inland river terminal, and finally realize the filling of oxygen to achieve the effect of oxygen resource reuse, thereby achieving the purpose of saving resources.

[0005] In order to realize the above-mentioned technical features, the object of the present invention is achieved as follows: an oxygen purification and filling system for a resource recovery type inland river terminal hydrogen production and refueling station, including a raw gas intake system connected to the oxygen outlet of the hydrogen production system, the raw gas intake system is connected to the raw gas storage tank, the upper part of the raw gas storage tank is connected to the lower part of the dehydrogenator through a connecting pipe, and the upper part of the dehydrogenator is connected to the first oxygen cooler through a connecting pipe; the first oxygen cooler is connected to the first steam-water separator, and the outlet of the first steam-water separator is connected to a drying system for circulating and drying oxygen; the outlet of the drying system is connected to the second oxygen cooler through the first gas outlet main pipe, and the outlet of the drying system is connected to the oxygen storage tank through the second gas outlet main pipe; the top outlet of the second oxygen cooler is connected to the second steam-water separator, and the second steam-water separator is connected to the drying system; the outlet of the oxygen storage tank is connected to the booster.

[0006] The raw gas intake system comprises a main intake pipe, and a first ball valve and a first check valve are installed between the main intake pipe and the raw gas storage tank.

[0007] A first safety valve and a first pressure gauge are installed on the top of the raw gas storage tank, a first liquid level gauge is installed on the raw gas storage tank, and a first drain valve and a first electric drain valve are installed on the bottom of the raw gas storage tank.

[0008] A first valve and a first electric valve are installed between the raw gas storage tank and the dehydrogenator.

[0009] The drying system comprises a first dryer, a second dryer and a third dryer connected in parallel;

[0010] A plurality of second electric valves for controlling air intake are arranged between the first dryer, the second dryer and the third dryer and the corresponding first steam-water separator and the second steam-water separator;

[0011] A plurality of third electric valves for controlling gas outlet are arranged between the first dryer, the second dryer and the third dryer and the corresponding second oxygen cooler and oxygen storage tank.

[0012] The first steam-water separator and the second steam-water separator adopt the same structure. The first steam-water separator is connected to a second liquid level meter, and the bottom end of the first steam-water separator is equipped with a second drain valve and a second electric drain valve.

[0013] The first oxygen cooler and the second oxygen cooler have the same structure. The lower part of the first oxygen cooler is connected to a chilled water inlet pipe, the upper part of the first oxygen cooler is connected to a chilled water outlet pipe, and the upper part of the first oxygen cooler is connected to a third drain valve.

[0014] A self-operated pressure regulating valve is installed on the second gas outlet main pipe.

[0015] A fourth electric valve is installed on the second gas outlet main pipe between the self-operated pressure regulating valve and the oxygen storage tank, and a sampling valve and a venting valve are connected between the fourth electric valve and the self-operated pressure regulating valve.

[0016] A second safety valve and a second pressure gauge are installed on the top of the oxygen storage tank, and a fifth electric valve is installed on the bottom of the oxygen storage tank.

[0017] When the oxygen cylinder group needs to be filled, the oxygen cylinder group is connected to the outlet of the booster through the second valve and the second ball valve.

[0018] The first dryer, the second dryer and the third dryer are respectively connected with temperature sensors for monitoring the temperature;

[0019] An online analyzer for detecting oxygen is installed on the second gas outlet main pipe.

[0020] It also includes a PLC controller, which is connected to the corresponding electric valves and instruments of the oxygen purification and filling system to achieve automatic control of the electric valves and monitoring of system parameters.

[0021] An operating method of an oxygen purification and filling system of a resource recovery type inland river terminal hydrogen production and hydrogenation station comprises the following steps:

[0022] Step 1: Collection of oxygen:

[0023] The oxygen from the electrolyzer is gathered and then transported to the raw gas storage tank by the raw gas intake system for storage;

[0024] Step 2, dehydrogenation of oxygen:

[0025] The mixed gas in the raw gas storage tank is transported to the inside of the dehydrogenator to remove a small amount of hydrogen mixed in the oxygen;

[0026] Step 3, primary dehydration of oxygen:

[0027] The oxygen containing water after dehydrogenation is transported to the first oxygen cooler, cooled by the first oxygen cooler, and the water vapor in the oxygen is liquefied by the first steam-water separator according to the different liquefaction temperatures of oxygen and water vapor, so as to achieve separation of pure water and oxygen;

[0028] Step 4: Drying of oxygen:

[0029] The oxygen that has been initially dehydrated will be transported to the drying system, where it will be dried.

[0030] Step 5: Re-dehydration of oxygen:

[0031] After drying, the oxygen will be analyzed by an online analyzer. If the internal moisture content is higher than the set value, the oxygen will be transported to the second oxygen cooler again and cooled by the second oxygen cooler. According to the different liquefaction temperatures of oxygen and water vapor, the water vapor in the oxygen will be liquefied by the second steam-water separator to achieve separation of pure water and oxygen.

[0032] Step 6: Re-drying of oxygen:

[0033] The oxygen that has been discharged again will be transported to the drying system, where it will be dried. Steps 5 to 6 will be repeated until the water content in the oxygen is lower than the set value.

[0034] Step 7, oxygen filling:

[0035] The completely dry oxygen is transported to the oxygen storage tank for storage, and then the oxygen is filled into the corresponding oxygen cylinder group through the booster.

[0036] The present invention has the following beneficial effects:

[0037] 1. The system of the present invention can be used to separate, purify and dry the oxygen byproducts produced during the hydrogen production process at the inland river terminal, and finally realize the filling of oxygen to achieve the effect of recycling oxygen resources and achieve the purpose of saving resources.

[0038] 2. The system of the present invention can achieve oxygen purification, and the concentration of the purified oxygen can reach 99%, which can well meet the needs of industrial production.

[0039] 3. The present invention can be used to transport and store oxygen with water vapor into the interior of the raw gas storage tank through the raw gas intake system mentioned above, can be used to control the supply of gas through the first ball valve, and can ensure one-way ventilation through the first check valve.

[0040] 4. The first safety valve mentioned above can serve the purpose of pressure limiting protection for the raw gas storage tank.

[0041] 5. The above-mentioned drying system can realize the drying process of oxygen synchronously according to the specific processing volume to improve the drying efficiency.

[0042] 6. Through the automatic on-off control of the second electric valve and the third electric valve, parallel drying of oxygen or multi-stage continuous drying or circulating drying of oxygen can be achieved. During the specific operation, it is only necessary to selectively control the on-off of the second electric valve and the third electric valve.

[0043] 7. The above-mentioned steam-water separator can separate the liquefied water and oxygen according to the principle of gravity.

[0044] 8. The oxygen storage tank mentioned above can be used to effectively store the purified oxygen.

[0045] 9. The above filling system can be used to fill oxygen.

[0046] 10. The above-mentioned online analyzer can realize online detection of oxygen purity after drying. When the purity meets the requirements, the filling operation will be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] Figure 1 It is the overall system diagram of the present invention.

[0049] Figure 2 For the present invention Figure 1 Partial system diagram before the first steam-water separator.

[0050] Figure 3 For the present invention Figure 1 Partial diagram of the medium drying system.

[0051] Figure 4 For the present invention Figure 1 A partial system diagram showing the location of the oxygen storage tanks.

[0052] In the figure: main air intake pipe 1, first ball valve 2, first check valve 3, raw gas storage tank 4, first safety valve 5, first pressure gauge 6, first liquid level gauge 7, first blowdown valve 8, first electric blowdown valve 9, first electric valve 10, first valve 11, dehydrogenator 12, PLC controller 13, first oxygen cooler 14, chilled water outlet pipe 15, chilled water inlet pipe 16, third blowdown valve 17, first steam-water separator 18, second liquid level gauge 19, second electric blowdown valve 20, second blowdown valve 21, second electric Valve 22, first dryer 23, second dryer 24, third dryer 25, third electric valve 26, temperature sensor 27, second steam-water separator 28, second oxygen cooler 29, second gas outlet main pipe 30, self-operated pressure regulating valve 31, fourth electric valve 32, sampling valve 33, vent valve 34, second safety valve 35, second pressure gauge 36, oxygen storage tank 37, fifth electric valve 38, booster 39, second valve 40, second ball valve 41, oxygen cylinder group 42, first gas outlet main pipe 43. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0054] Embodiment 1:

[0055] See also Figure 1-4, an oxygen purification and filling system for a resource recovery type inland river terminal hydrogen production and refueling station, including a raw gas intake system connected to the oxygen outlet of the hydrogen production system, the raw gas intake system is connected to the raw gas storage tank 4, the upper part of the raw gas storage tank 4 is connected to the lower part of the dehydrogenator 12 through a connecting pipe, and the upper part of the dehydrogenator 12 is connected to the first oxygen cooler 14 through a connecting pipe; the first oxygen cooler 14 is connected to the first steam-water separator 18, and the outlet of the first steam-water separator 18 is connected to a drying system for circulating and drying oxygen; the outlet of the drying system is connected to the second oxygen cooler 29 through the first gas outlet main pipe 43, and the outlet of the drying system is connected to the oxygen storage tank 37 through the second gas outlet main pipe 30; the top outlet of the second oxygen cooler 29 is connected to the second steam-water separator 28, and the second steam-water separator 28 is connected to the drying system; the outlet of the oxygen storage tank 37 is connected to the supercharger 39. The system of the present invention can be used to separate, purify and dry the oxygen byproducts generated during the hydrogen production process at the inland river terminal, and finally realize the filling of oxygen to achieve the effect of reusing oxygen resources and save resources. In the specific operation process, the oxygen with water vapor is initially collected and cached by the original gas storage tank 4, and then the small part of the hydrogen contained therein is removed by the dehydrogenator 12, and the first oxygen cooler 14 and the first steam-water separator 18 are coordinated to achieve the initial separation of water; and after separation, it is synchronously or continuously dried by the drying equipment, and a secondary water separation is performed after drying. Finally, the oxygen that meets the standards is stored, and the oxygen is regularly filled.

[0056] Furthermore, the raw gas intake system includes a main intake pipe 1, and a first ball valve 2 and a first check valve 3 are installed between the main intake pipe 1 and the raw gas storage tank 4. The raw gas intake system can be used to transport and store oxygen with water vapor into the raw gas storage tank 4, the first ball valve 2 can be used to control the supply of gas, and the first check valve 3 can ensure one-way ventilation.

[0057] Furthermore, a first safety valve 5 and a first pressure gauge 6 are installed on the top of the raw gas storage tank 4, a first liquid level gauge 7 is installed on the raw gas storage tank 4, and a first drain valve 8 and a first electric drain valve 9 are installed at the bottom of the raw gas storage tank 4. The first safety valve 5 can be used to limit the pressure of the raw gas storage tank 4. The first pressure gauge 6 can be used to display the pressure inside the raw gas storage tank 4. The first liquid level gauge 7 can be used to display the liquid level height inside the raw gas storage tank 4, so as to discharge the liquid inside in time.

[0058] Furthermore, a first valve 11 and a first electric valve 10 are installed between the raw gas storage tank 4 and the dehydrogenator 12. The first valve 11 can be used to control the supply of oxygen. The first electric valve 10 can be used for oxygen emission treatment under special circumstances.

[0059] Furthermore, the drying system includes a first dryer 23, a second dryer 24 and a third dryer 25 connected in parallel; a plurality of second electric valves 22 for controlling air intake are arranged between the first dryer 23, the second dryer 24 and the third dryer 25 and the corresponding first steam-water separator 18 and the second steam-water separator 28. The above-mentioned drying system can realize the drying process of oxygen synchronously according to the specific processing amount to improve the drying efficiency. In the specific drying process, the oxygen that has been initially dehydrated is transported to the corresponding first dryer 23, the second dryer 24 or the third dryer 25 for drying.

[0060] Furthermore, a plurality of third electric valves 26 for controlling the gas outlet are arranged between the first dryer 23, the second dryer 24 and the third dryer 25 and the corresponding second oxygen cooler 29 and the oxygen storage tank 37. Through the automatic on-off control of the second electric valve 22 and the third electric valve 26, the parallel operation drying or multi-stage continuous drying or the circulating drying of oxygen can be realized. In the specific operation process, it is only necessary to selectively control the on-off of the second electric valve 22 and the third electric valve 26.

[0061] Furthermore, the first steam-water separator 18 and the second steam-water separator 28 adopt the same structure, the first steam-water separator 18 is connected to the second liquid level gauge 19, and the bottom of the first steam-water separator 18 is installed with a second drain valve 21 and a second electric drain valve 20. The steam-water separator can separate the liquefied water and oxygen according to the principle of gravity. In the specific operation process, the oxygen and water are cooled, and since the liquefaction temperature of water is lower than the hydraulic temperature of oxygen, the water vapor will be liquefied into water droplets after cooling, and fall under the action of gravity, thereby achieving

[0062] Furthermore, the first oxygen cooler 14 and the second oxygen cooler 29 adopt the same structure, the lower part of the first oxygen cooler 14 is connected to a chilled water inlet pipe 16, the upper part of the first oxygen cooler 14 is connected to a chilled water outlet pipe 15, and the first oxygen cooler 14 is connected to a third drain valve 17. The above oxygen cooler can be used to cool oxygen mixed with water vapor, thereby realizing the liquefaction of water vapor in the mixed gas.

[0063] Furthermore, a self-operated pressure regulating valve 31 is installed on the second gas outlet main pipe 30. The self-operated pressure regulating valve 31 can be used to achieve pressure regulation of the second gas outlet main pipe 30, thereby ensuring the safety of system operation.

[0064] Furthermore, a fourth electric valve 32 is installed on the second gas outlet main pipe 30 between the self-operated pressure regulating valve 31 and the oxygen storage tank 37 , and a sampling valve 33 and a vent valve 34 are connected between the fourth electric valve 32 and the self-operated pressure regulating valve 31 .

[0065] Furthermore, a second safety valve 35 and a second pressure gauge 36 are installed on the top of the oxygen storage tank 37, and a fifth electric valve 38 is installed on the bottom of the oxygen storage tank 37. The oxygen storage tank 37 can be used to effectively store purified oxygen. During operation, the second safety valve 35 is used to control the system pressure of the oxygen storage tank 37 to ensure the safety of the operation. The second pressure gauge 36 is used to monitor the pressure of the oxygen storage tank 37.

[0066] Further, when the oxygen cylinder group 42 needs to be filled, the oxygen cylinder group 42 is connected to the outlet of the supercharger 39 through the second valve 40 and the second ball valve 41. The above-mentioned filling system can be used to fill oxygen. When the oxygen in the oxygen storage tank 37 is stored to a certain amount, the oxygen is pressurized by the supercharger 39 and then filled into the oxygen cylinder group 42 for storage.

[0067] Furthermore, the first dryer 23, the second dryer 24 and the third dryer 25 are respectively connected with a temperature sensor 27 for monitoring the temperature. The temperature sensor 27 is used to monitor the temperature of the first dryer 23, the second dryer 24 and the third dryer 25 in real time, thereby ensuring the best drying temperature to ensure the drying effect.

[0068] Furthermore, an online analyzer for detecting oxygen is installed on the second gas outlet main pipe 30. The online analyzer can realize online detection of oxygen purity after drying, and the filling operation will be carried out only when the purity meets the requirements.

[0069] Furthermore, a PLC controller 13 is included, which is connected to the corresponding electric valves and instruments of the oxygen purification and filling system to realize automatic control of the electric valves and monitoring of system parameters. The above-mentioned PLC controller 13 facilitates automatic control of the entire system.

[0070] Working principle of the present invention:

[0071] By adopting the oxygen purification filling provided by the present invention, in the specific operation process, the oxygen from the PEM electrolyzer is separated from the pure water through the oxygen purification system, and the oxygen and pure water mixed gas and liquid first enter the oxygen-water separator, and most of the pure water and oxygen are separated by gravity. The maximum operating temperature of the oxygen produced by the PEM electrolyzer reaches 65°C. At this time, it is still necessary to further separate the water in the oxygen. The purpose of separation is to recover as much pure water as possible and reduce the pure water consumption of the system. The oxygen after the secondary oxygen gas-water separation is analyzed by the online analyzer in turn. After analysis, the unqualified oxygen will be vented, and the oxygen that meets the established standards can be vented or collected in a centralized manner according to user requirements to form a crude oxygen product. At the same time, the gas production data here can be submitted to the PLC controller for statistics to meet data storage and recording requirements.

[0072] Embodiment 2:

[0073] An operating method of an oxygen purification and filling system of a resource recovery type inland river terminal hydrogen production and hydrogenation station comprises the following steps:

[0074] Step 1: Collection of oxygen:

[0075] The oxygen from the electrolyzer is transported to the raw gas storage tank 4 by the raw gas intake system for storage after being gathered;

[0076] Step 2, dehydrogenation of oxygen:

[0077] The mixed gas in the raw gas storage tank 4 is transported to the interior of the dehydrogenator 12 to remove a small amount of hydrogen mixed in the oxygen;

[0078] Step 3, primary dehydration of oxygen:

[0079] The oxygen containing water after dehydrogenation is transported to the first oxygen cooler 14, and is cooled by the first oxygen cooler 14. According to the different liquefaction temperatures of oxygen and water vapor, the water vapor in the oxygen is liquefied by the first steam-water separator 18 to achieve separation of pure water and oxygen;

[0080] Step 4: Drying of oxygen:

[0081] The oxygen that has been initially dehydrated will be transported to the drying system, where it will be dried.

[0082] Step 5: Re-dehydration of oxygen:

[0083] After drying, the oxygen will be analyzed by an online analyzer. If the internal moisture content is higher than the set value, the oxygen will be transported to the second oxygen cooler 29 again, and cooled by the second oxygen cooler 29. According to the different liquefaction temperatures of oxygen and water vapor, the water vapor in the oxygen will be liquefied by the second steam-water separator 28 to achieve separation of pure water and oxygen.

[0084] Step 6: Re-drying of oxygen:

[0085] The oxygen that has been discharged again will be transported to the drying system, where it will be dried. Steps 5 to 6 will be repeated until the water content in the oxygen is lower than the set value.

[0086] Step 7, oxygen filling:

[0087] The completely dry oxygen is transported to the oxygen storage tank 37 for storage, and then the oxygen is filled into the corresponding oxygen cylinder group 42 through the booster 39.

Claims

1. An oxygen purification and filling system for a resource recovery type inland river terminal hydrogen production and hydrogenation station, characterized in that: The invention comprises a raw gas intake system connected to the oxygen outlet of the hydrogen production system, the raw gas intake system is connected to the raw gas storage tank (4), the upper part of the raw gas storage tank (4) is connected to the lower part of the dehydrogenator (12) through a connecting pipe, and the upper part of the dehydrogenator (12) is connected to the first oxygen cooler (14) through a connecting pipe; the first oxygen cooler (14) is connected to the first steam-water separator (18), and the outlet of the first steam-water separator (18) is connected to a drying system for circulating and drying oxygen; the outlet of the drying system is connected to the second oxygen cooler (29) through a first gas outlet main pipe (43), and the outlet of the drying system is connected to the oxygen storage tank (37) through a second gas outlet main pipe (30); the top outlet of the second oxygen cooler (29) is connected to the second steam-water separator (28), and the second steam-water separator (28) is connected to the drying system; the outlet of the oxygen storage tank (37) is connected to the supercharger (39); The drying system comprises a first dryer (23), a second dryer (24) and a third dryer (25) connected in parallel; A plurality of second electric valves (22) for controlling air intake are arranged between the first dryer (23), the second dryer (24) and the third dryer (25) and the corresponding first steam-water separator (18) and the second steam-water separator (28); A plurality of third electric valves (26) for controlling gas outlet are arranged between the first dryer (23), the second dryer (24) and the third dryer (25) and the corresponding second oxygen cooler (29) and the oxygen storage tank (37); The first oxygen cooler (14) and the second oxygen cooler (29) have the same structure; the lower part of the first oxygen cooler (14) is connected to a chilled water inlet pipe (16); the upper part of the first oxygen cooler (14) is connected to a chilled water outlet pipe (15); and the upper part of the first oxygen cooler (14) is connected to a third drain valve (17); The first dryer (23), the second dryer (24) and the third dryer (25) are respectively connected to a temperature sensor (27) for monitoring the temperature; An online analyzer for detecting oxygen is installed on the second gas outlet main pipe (30); It also includes a PLC controller (13), which is connected to corresponding electric valves and instruments of the oxygen purification and filling system to achieve automatic control of the electric valves and monitoring of system parameters.

2. According to claim 1, an oxygen purification and filling system for a resource recovery type inland river terminal hydrogen production and hydrogenation station is characterized in that: The raw gas intake system comprises a main intake pipe (1), and a first ball valve (2) and a first check valve (3) are installed between the main intake pipe (1) and the raw gas storage tank (4).

3. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 1 is characterized by: A first safety valve (5) and a first pressure gauge (6) are installed on the top of the raw gas storage tank (4), a first liquid level gauge (7) is installed on the raw gas storage tank (4), and a first drain valve (8) and a first electric drain valve (9) are installed at the bottom of the raw gas storage tank (4).

4. According to claim 1, an oxygen purification and filling system for a resource recovery type inland river terminal hydrogen production and hydrogenation station is characterized in that: A first valve (11) and a first electric valve (10) are installed between the raw gas storage tank (4) and the dehydrogenator (12).

5. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 1, characterized in that: The first steam-water separator (18) and the second steam-water separator (28) have the same structure; the first steam-water separator (18) is connected to a second liquid level meter (19); and a second drain valve (21) and a second electric drain valve (20) are installed at the bottom end of the first steam-water separator (18).

6. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 1, characterized in that: A self-operated pressure regulating valve (31) is installed on the second gas outlet main pipe (30).

7. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 6, characterized in that: A fourth electric valve (32) is installed on the second gas outlet main pipe (30) between the self-operated pressure regulating valve (31) and the oxygen storage tank (37), and a sampling valve (33) and a vent valve (34) are connected between the fourth electric valve (32) and the self-operated pressure regulating valve (31).

8. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 1, characterized in that: A second safety valve (35) and a second pressure gauge (36) are installed on the top of the oxygen storage tank (37), and a fifth electric valve (38) is installed on the bottom of the oxygen storage tank (37).

9. The oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and hydrogenation station according to claim 1, characterized in that: When the oxygen cylinder group (42) needs to be filled, the oxygen cylinder group (42) is connected to the outlet of the booster (39) via the second valve (40) and the second ball valve (41).

10. The method for operating the oxygen purification and filling system of the resource recovery type inland river terminal hydrogen production and refueling station according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Oxygen collection: The oxygen from the electrolyzer is collected and then transported to the raw gas storage tank (4) through the raw gas intake system for storage; Step 2, dehydrogenation of oxygen: The mixed gas in the raw gas storage tank (4) is transported to the interior of the dehydrogenator (12) to remove a small amount of hydrogen mixed in the oxygen; Step 3, primary dehydration of oxygen: The oxygen containing water after dehydrogenation is transported to a first oxygen cooler (14), cooled by the first oxygen cooler (14), and the water vapor in the oxygen is liquefied by a first steam-water separator (18) according to the difference in liquefaction temperature between oxygen and water vapor, thereby achieving separation of pure water and oxygen; Step 4: Drying of oxygen: The oxygen that has been initially dehydrated will be transported to the drying system, where it will be dried. Step 5: Re-dehydration of oxygen: After drying, the oxygen is analyzed by an online analyzer. If the internal moisture content is higher than a set value, the oxygen is transported to the second oxygen cooler (29) again, cooled by the second oxygen cooler (29), and liquefied by the second steam-water separator (28) according to the different liquefaction temperatures of oxygen and water vapor, thereby achieving separation of pure water and oxygen. Step 6: Re-drying of oxygen: The oxygen that has been dehydrated again will be transported to the drying system, where it will be dried. Steps 5 to 6 will be repeated until the water content in the oxygen is lower than the set value. Step 7, oxygen filling: The completely dried oxygen is transported to the oxygen storage tank (37) for storage, and then the oxygen is filled into the corresponding oxygen cylinder group (42) through the booster (39).

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