High-pressure and high-purity hydrogen preparation and supply system

Abstract

The invention provides a high-pressure and high-purity hydrogen preparation and supply system, which comprises a hydrogen production unit, a purification unit and a pressurization supply unit, the hydrogen production unit prepares hydrogen through a water electrolysis process in an electrolytic bath, the hydrogen is purified to 99.999% or more through the purification unit, and then the hydrogen enters a hydrogen pressurization pipeline of a pressurization process unit; after being pressurized to the filling pressure required by the hydrogen using device under the action of the gas-driven booster pump, the hydrogen is fed into the hydrogen using device through the hydrogen filling port, the hydrogen is produced when being used, a buffer tank or a storage tank is not arranged, the structure is compact, and the size is small. Meanwhile, the system further comprises a control unit for controlling the hydrogen production unit, the purification unit and the pressurization supply unit to operate and a safety protection unit for guaranteeing stable operation of the system, automatic operation of the system can be achieved, and safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by water electrolysis, and further to a system for preparing and supplying high-pressure and high-purity hydrogen. Background Art

[0002] The development of new energy is an important part of the national energy development strategy. As a low-carbon and zero-carbon energy source, hydrogen has the advantages of large reserves, high calorific value, and zero pollution. At present, the application of hydrogen in the hydrogen energy industry mainly includes four links, namely hydrogen production, storage, transportation and filling. Due to the characteristics of hydrogen, accidents are more likely to occur in the hydrogen storage link, and the cost of hydrogen transportation is relatively high.

[0003] In special fields, including nuclear power, nuclear power platforms and other special occasions, hydrogen is becoming more and more important, and the application of hydrogen production and hydrogenation technology is becoming more and more extensive. At present, the main solution is to use high-pressure hydrogen cylinders to store hydrogen and supply gas after pressure regulation. The main disadvantages of this device are small hydrogen storage capacity and low safety.

[0004] The water electrolysis hydrogen production process is one of the methods for producing hydrogen. Water is electrolyzed in an electrolyzer to generate oxygen and hydrogen. Currently, it mainly includes alkaline water hydrogen production technology and proton exchange membrane (PEM) water electrolysis hydrogen production technology. Among them, the PEM water electrolysis hydrogen production process has the advantages of high efficiency, high gas purity, green environmental protection, low energy consumption, no alkaline solution, small size, safety and reliability, and can achieve higher gas production pressure.

[0005] Therefore, how to utilize the advantages of the PEM water electrolysis hydrogen production process to design a high-pressure, high-purity hydrogen production and supply system that can meet the high requirements of space, size, weight, purity, and safety, while also effectively reducing the danger of high-pressure hydrogen storage in existing solutions and shortening or streamlining the hydrogen transportation process has become a problem that needs to be solved urgently. Summary of the invention

[0006] In view of the safety hazards and high costs in the storage and transportation of high-pressure hydrogen in the prior art, the purpose of the present invention is to provide a high-pressure and high-purity hydrogen production and supply system, which can produce hydrogen that meets the pressure, purity and flow requirements on site and fill it into a hydrogen-using device. The purity of the hydrogen provided by the system can reach more than 99.999%. At the same time, the system has a high degree of automation and high safety, which can avoid losses and safety hazards in the hydrogen storage and transportation links.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A high-pressure and high-purity hydrogen production and supply system, characterized by comprising:

[0009] Hydrogen production unit, purification unit, booster supply unit and control unit;

[0010] The control unit includes a controller, which is connected to and controls the operation of the hydrogen production unit, the purification unit and the boost supply unit;

[0011] The hydrogen production unit comprises an electrolyzer, an oxygen-water separator, and a hydrogen-water separator. The electrolyzer is provided with a raw water inlet, an oxygen outlet, and a hydrogen outlet. The oxygen outlet and the hydrogen outlet are respectively connected to the gas inlet of the oxygen-water separator and the gas inlet of the hydrogen-water separator, and the liquid outlet of the oxygen-water separator and the liquid outlet of the hydrogen-water separator are both connected to the raw water inlet.

[0012] The purification unit comprises a deoxidizer filled with a deoxidation catalyst, the inlet of the deoxidizer is connected to the gas outlet of the hydrogen-water separator, and the deoxidizer is used to remove oxygen and other impurities in the hydrogen;

[0013] The boost supply unit comprises at least one hydrogen boost pipeline, the inlet of the hydrogen boost pipeline is connected to the outlet of the deoxidizer, and the outlet of the hydrogen boost pipeline is connected to the hydrogen filling port of the hydrogen using device;

[0014] The hydrogen boosting pipeline is provided with a gas-driven boosting pump for boosting the pressure of the purified hydrogen to the pressure required by the hydrogen-using device.

[0015] In some embodiments, the boost supply unit further includes an air compressor and a pressure regulating device, wherein the air compressor is connected to the air-driven boost pump to provide a boost air source for the air-driven boost pump;

[0016] The pressure regulating device is arranged on the pipeline between the air compressor and the air-driven booster pump, and is used to adjust the pressure of the booster gas source.

[0017] In some embodiments, a cooling system comprises a cooling water inlet pipeline, a cooling water outlet pipeline, a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are respectively arranged in the oxygen-water separator and the hydrogen-water separator, and the cooling water inlet pipeline, the cold side of the first heat exchanger, the cold side of the second heat exchanger and the cooling water outlet pipeline are connected in sequence.

[0018] In some embodiments, the purification unit further comprises a condenser, a gas inlet of the condenser is connected to an outlet of the deoxygenator, a gas outlet of the condenser is connected to an inlet of the hydrogen booster pipeline, and a liquid outlet of the condenser is connected to the outside.

[0019] In some embodiments, the invention further comprises: a first discharge pipeline and a second discharge pipeline,

[0020] The inlet of the first discharge pipeline is arranged on the pipeline between the outlet of the deoxidizer and the inlet of the hydrogen boosting pipeline, the outlet of the first discharge pipeline is connected to the outside atmosphere, and a manual discharge valve is arranged on the first discharge pipeline;

[0021] The inlet of the second discharge pipeline is arranged on the pipeline between the outlet of the gas-driven booster pump and the hydrogen filling port, the outlet of the second discharge pipeline is connected to the outside atmosphere, and an automatic discharge valve is arranged on the second discharge pipeline, and the automatic discharge valve is electrically connected to the controller.

[0022] In some embodiments, the hydrogen production unit further includes a raw water tank and a water replenishment pump, wherein the raw water tank is used to provide the raw water required for hydrogen production by water electrolysis, and the water replenishment pump is used to provide transportation power for the raw water.

[0023] In some embodiments, a safety protection unit for ensuring stable operation of the system;

[0024] The safety protection unit includes: an alarm device and a concentration detection element electrically connected to the controller;

[0025] The controller is provided with an interlocking protection program. When the concentration value collected by the concentration detection element exceeds the concentration alarm value, the controller performs interlocking protection operations on the hydrogen production unit, the purification unit and the boost supply unit respectively, and the alarm device sends an alarm signal to remind the staff.

[0026] The concentration detection elements include: a hydrogen concentration analyzer in oxygen, an oxygen concentration analyzer in hydrogen, an ambient hydrogen concentration sensor, and an ambient oxygen concentration sensor;

[0027] The hydrogen-in-oxygen concentration analyzer and the oxygen-in-hydrogen concentration analyzer are respectively arranged at the gas outlet of the oxygen-water separator and the gas outlet of the hydrogen separator, and are used to respectively detect the concentration of hydrogen in the oxygen and the concentration of oxygen in the hydrogen electrolyzed by the electrolyzer;

[0028] The environmental hydrogen concentration sensor and the environmental oxygen concentration sensor are used to respectively detect the oxygen concentration and the hydrogen concentration in the working area where the production and supply system is located.

[0029] In some embodiments, the control unit further comprises a collection element and a regulating element electrically connected to the controller respectively.

[0030] The collecting element comprises: a first pressure sensor, a first temperature sensor and a first liquid level meter arranged on the oxygen-water separator, for measuring the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the oxygen-water separator respectively;

[0031] A second pressure sensor, a second temperature sensor and a second liquid level meter are arranged on the hydrogen-water separator, and are used to respectively measure the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the hydrogen-water separator;

[0032] A hydrogen flow meter, which is arranged on the pipeline between the outlet of the deoxidizer and the inlet of the hydrogen boosting pipeline;

[0033] a third pressure sensor, the third pressure sensor being arranged on the hydrogen boosting pipeline;

[0034] A water flow meter, the water flow meter is arranged at the raw water inlet;

[0035] The regulating element comprises:

[0036] a first hydrogen pressure-stabilizing valve, which is arranged on a pipeline between a gas outlet of the hydrogen-water separator and an inlet of the deoxidizer;

[0037] a second hydrogen pressure-stabilizing valve, the second pressure-stabilizing valve being arranged on a pipeline between the gas outlet of the deoxidizer and the gas-driven booster pump;

[0038] A high-pressure hydrogen pressure-stabilizing valve is provided on the pipeline between the gas-driven booster pump and the hydrogen filling port.

[0039] In some embodiments, the system further comprises: a nitrogen purge replacement device, wherein the nitrogen purge replacement device is used to purge the hydrogen production unit, the purification unit and the boost supply unit.

[0040] In some embodiments, the deoxygenation catalyst is a palladium catalyst and a room temperature platinum Pt catalyst.

[0041] Compared with the prior art, the high-pressure and high-purity hydrogen production and supply system provided by the present invention has the following beneficial effects:

[0042] 1. The high-pressure and high-purity hydrogen production and supply system provided by the present invention has a small amount of hydrogen temporarily stored in it, does not require a hydrogen storage tank or a hydrogen buffer tank, reduces the size of the device, has a compact structure, and has the functions of on-site real-time production of hydrogen that meets the purity, flow rate and pressure requirements and refilling, thereby avoiding the loss of hydrogen and safety hazards in the transportation link;

[0043] 2. The hydrogen pressurization process in the preparation and supply system provided by the present invention is highly reliable, and a small air-driven booster pump is used. The feature of not needing to use lubricants increases the safety of the system. Compared with other pump bodies driven by motors, the air-driven booster pump uses air as the driving gas source, which has less heat dissipation during operation, and has the characteristics of safe operation and simple maintenance.

[0044] 3. The deoxygenation catalyst provided by the present invention uses a room temperature platinum (Pt) catalyst, which has the advantages of super hydrophobicity, good stability, high precious metal dispersion, good activity, and small usage. After being purified by the deoxygenation catalyst, the purity of hydrogen can reach more than 99.999%;

[0045] 4. The production and supply system provided by the present invention sets the output pressure of the hydrogen production unit and the purification unit to 1.5-2MPa, and sets the hydrogen pressure output by the boost supply unit to 2.0-20MPa. At the same time, a first discharge pipeline and a second discharge pipeline are provided. When overpressure occurs in the pipelines of the hydrogen production unit and the purification unit, the pressure is discharged through the first discharge pipeline. When overpressure occurs in the pipeline of the boost supply unit, the pressure is discharged through the second discharge pipeline to avoid danger.

[0046] 5. The control unit provided by the present invention enables the system to form a complete automation system, which can realize the automatic operation of the hydrogen production process by electrolysis of water, the purification process and the pressurization and filling process, monitor the operating status of each unit in real time, and ensure the orderly operation of the entire system.

[0047] 6. The safety protection unit and control unit in the preparation and supply system provided by the present invention cooperate with each other to collect and monitor the operating parameters and status of each device, valve body and measuring element in the system. When the monitoring value of the safety protection unit exceeds the set safety value, the control unit immediately controls each device and valve body to perform corresponding actions to avoid safety accidents, thereby improving the safety and reliability of the system and providing a strong guarantee for the stable operation of the system.

[0048] 7. The safety design of the present invention is strictly implemented in accordance with national and industry specifications. All devices, valve bodies and measuring elements in the system are explosion-proof. The explosion-proof levels of major equipment are: the explosion-proof level of the solenoid valve is ExdIICT5 and above, the explosion-proof level of the acquisition element is ExdIICT6 and above, the explosion-proof level of the air compressor is ExdIICT4 and above, and the explosion-proof level of the pressure regulating valve is ExdIICT4 and above. The system has the ability to work normally under environmental conditions such as vibration, impact, tilt and swing. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0050] Figure 1 This is a schematic diagram of the structure of the high-pressure and high-purity hydrogen production and supply system provided by the present invention.

[0051] Description of Figure Numbers:

[0052] 1—electrolyzer; 101—raw water inlet; 102—oxygen outlet; 103—hydrogen outlet;

[0053] 2—oxygen water separator; 3—hydrogen water separator; 4—deoxygenator; 5—gas drive booster pump; 6—hydrogen filling port; 7—oxygen discharge port;

[0054] 8—air compressor; 9—pressure regulating device; 10—cooling water inlet pipeline; 11—cooling water inlet; 12—cooling water outlet pipeline; 13—cooling water outlet;

[0055] 14—first heat exchanger; 15—second heat exchanger; 16—condensate collector; 17—second drain port;

[0056] 18—first discharge pipeline; 19—manual discharge valve; 20—second discharge pipeline; 21—automatic discharge valve; 22—discharge port;

[0057] 23—Raw material water tank; 24—Water supply pump; 25—Water supply port; 26—First drainage port;

[0058] 27—oxygen hydrogen concentration analyzer; 28—hydrogen oxygen concentration analyzer; 29—ambient hydrogen concentration sensor; 30—ambient oxygen concentration sensor;

[0059] 31 - first pressure sensor; 32 - first temperature sensor; 33 - first liquid level gauge;

[0060] 34—second pressure sensor; 35—second temperature sensor; 36—second liquid level gauge;

[0061] 37—circulating water pump; 38—hydrogen flow meter;

[0062] 39—third pressure sensor; 40—water flow meter; 41—first hydrogen pressure regulating valve; 42—second hydrogen pressure regulating valve; 43—high-pressure hydrogen pressure regulating valve; 44—nitrogen purge replacement device; 45—water purifier. DETAILED DESCRIPTION

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0064] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0065] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0066] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0068] Example 1

[0069] The present invention provides a high-pressure and high-purity hydrogen production and supply system, comprising: a hydrogen production unit, a purification unit, a pressurized supply unit and a control unit. Specifically:

[0070] The hydrogen production unit includes an electrolyzer 1, an oxygen-water separator 2, and a hydrogen-water separator 3. The electrolyzer 1 is provided with a raw water inlet 101, an oxygen outlet 102, and a hydrogen outlet 103. The oxygen outlet 102 and the hydrogen outlet 103 are respectively connected to the gas inlet of the oxygen-water separator 2 and the gas inlet of the hydrogen-water separator 3. The electrolyzed water is decomposed into oxygen and hydrogen in the electrolyzer 1, and enters the oxygen-water separator 2 and the hydrogen-water separator 3 respectively for gas-water separation.

[0071] The electrolyzer 1 mentioned above is a proton exchange membrane (PEM) electrolyzer.

[0072] The liquid outlet of the oxygen-water separator 2 and the liquid outlet of the hydrogen-water separator 3 are both connected to the raw water inlet 101, and the electrolyzed water separated from the oxygen and hydrogen re-enters the electrolytic cell 1 for decomposition.

[0073] Preferably, the liquid outlet of the oxygen-water separator 2 and the liquid outlet of the hydrogen-water separator 3 are combined into one and then connected to the raw water inlet connection 101 to form an electrolyzed water circulation loop.

[0074] Preferably, a circulating water pump 37 and a water flow meter 40 are provided on the electrolyzed water circulation loop.

[0075] More preferably, a water purifier 45 is further provided on the electrolyzed water circulation loop. The water purifier 45 is arranged upstream of the raw water inlet 101 to remove impurities and purify the electrolyzed water entering the electrolytic cell 1 .

[0076] The gas outlet of the oxygen-water separator 2 is connected to an oxygen discharge port 7 to discharge the oxygen out of the system for other use.

[0077] The above-mentioned purification unit includes a deoxidizer 4 filled with a deoxidation catalyst. The inlet of the deoxidizer 4 is connected to the gas outlet of the hydrogen-water separator 3. The hydrogen separated from the electrolyzed water enters the deoxidizer 4. The deoxidizer 4 can remove oxygen and other impurities in the hydrogen. The purity of the hydrogen after being treated by the deoxidizer 4 can reach more than 99.999%.

[0078] Preferably, the above-mentioned deoxidation catalyst uses a room temperature platinum (Pt) catalyst based on the traditional palladium (Pd) catalyst. The room temperature platinum (Pt) catalyst has the advantages of super hydrophobicity, good stability, high precious metal dispersion, good activity, and small usage.

[0079] The above-mentioned boost supply unit includes at least one hydrogen boost pipeline, the inlet of the hydrogen boost pipeline is connected to the outlet of the deoxidizer 4, and the outlet of the hydrogen boost pipeline is connected to the hydrogen filling port 6 of the hydrogen using device. The pure dry hydrogen discharged from the deoxidizer 4 enters the hydrogen boost pipeline.

[0080] The hydrogen boosting pipeline is provided with an air-driven boosting pump 5, which can boost the pressure of the purified hydrogen to the filling pressure required by the hydrogen-using device.

[0081] In order to ensure the operational stability of the system, two hydrogen boosting pipelines are preferably provided, one for use and one for backup, and the outlets of the two hydrogen boosting pipelines are merged into one and connected to the hydrogen filling port 6 .

[0082] The air-driven booster pump 5 has the advantages of safe operation and simple maintenance. The air-driven booster pump 5 can automatically adjust the driving air intake according to the low-pressure hydrogen flow rate, without adjusting the motor frequency like an electric compressor, thereby greatly reducing the heat dissipation during the operation of the pump and improving the operational reliability. Unlike other pumps, the air-driven booster pump 5 does not require the use of lubricants, which greatly increases the safety performance of the system.

[0083] The hydrogen pressure output by the above-mentioned hydrogen production unit and purification unit can be set to 1.5-2MPa, and the hydrogen pressure output by the boost supply unit can be set according to actual needs, preferably 2.0-20MPa.

[0084] The control unit includes a controller, which connects and controls the operation of the hydrogen production unit, the purification unit and the boost supply unit, specifically including controlling the operating status and operating parameters of the electrolyzer 1, the oxygen water separator 2, the hydrogen water separator 3, the deoxygenator and the gas-driven boost pump 5.

[0085] In some embodiments, the above-mentioned boost supply unit also includes an air compressor 8 and a pressure regulating device 42. The air compressor 8 is connected to the air-driven boost pump 5 to provide a boost gas source for the air-driven boost pump 5. The air compressor 8 has its own explosion-proof function; the pressure regulating device 42 is arranged on the pipeline between the air compressor 8 and the air-driven boost pump 5 to adjust the pressure of the boost gas source.

[0086] In some embodiments, the production and supply system further includes: a cooling system, the cooling system including a cooling water inlet pipeline 10 , a cooling water outlet pipeline 12 , a first heat exchanger 14 and a second heat exchanger 15 .

[0087] The first heat exchanger 14 is disposed in the oxygen water separator 2, and the second heat exchanger 15 is disposed in the hydrogen water separator 3 (not shown in the figure). The first heat exchanger 14 and the second heat exchanger 15 are preferably finned heat exchange tubes.

[0088] The cooling water inlet pipeline 10, the cold side of the first heat exchanger 14, the cold side of the second heat exchanger 15, and the cooling water outlet pipeline 12 are connected in sequence to cool the oxygen in the hot side of the first heat exchanger 14 and the hydrogen in the hot side of the second heat exchanger 15 respectively.

[0089] The cooling water inlet pipeline 10 is connected to the cooling water inlet 11 to facilitate the operator to replenish the cooling water; the cooling water outlet pipeline 12 is connected to the cooling water outlet 13 to discharge the cooling water out of the system.

[0090] In some embodiments, the purification unit further includes a condenser 16, in which a condenser (not shown) is provided, a gas inlet of the condenser 16 is connected to the outlet of the deoxidizer 4, a gas outlet of the condenser 16 is connected to the inlet of the hydrogen booster pipeline, and a liquid outlet of the condenser 16 is connected to the outside. Under the action of the deoxidation catalyst in the deoxidizer 4, a trace amount of impurity oxygen in the hydrogen is hydrogenated to form water and enters the condenser 16 with the hydrogen, and is discharged from the gas outlet of the condenser 16 after cooling, and then enters the hydrogen booster pipeline.

[0091] The liquid outlet of the condensate collector 16 is connected to the second drain port 17 through a pipeline, and the condensed water accumulated in the condensate collector 16 is discharged from the liquid outlet of the condensate collector 16 and then discharged from the system through the second drain port 17 .

[0092] In some embodiments, the production and supply system further includes: a first discharge pipeline 18 and a second discharge pipeline 20 .

[0093] Among them, the inlet of the first discharge pipeline 18 is arranged on the pipeline between the outlet of the deoxygenator 5 and the inlet of the hydrogen boosting pipeline, and more preferably, it is arranged on the pipeline between the gas outlet of the condenser 16 and the inlet of the gas-driven boosting pump 5. The outlet of the first discharge pipeline 18 is connected to the outside atmosphere. A manual discharge valve 19 is provided on the first discharge pipeline. When the pressure in the pipeline upstream of the hydrogen boosting pipeline is high or blocked, the manual discharge valve 19 can be opened for discharge.

[0094] The inlet of the second discharge pipeline 20 is arranged on the pipeline between the outlet of the gas-driven booster pump 5 and the hydrogen filling port 6. The outlet of the second discharge pipeline 20 is connected to the outside atmosphere. An automatic discharge valve 21 is provided on the second discharge pipeline 20. The automatic discharge valve 21 is electrically connected to the controller. When the pipeline pressure between the gas-driven booster pump 5 and the hydrogen filling port 6 is too high or blocked, the controller controls the automatic discharge valve 21 to open for emergency discharge.

[0095] Furthermore, the outlet of the first discharge pipeline 18 and the outlet of the second discharge pipeline 20 may be combined into one, and communicated with the outside atmosphere through the discharge port 22 .

[0096] In some embodiments, the hydrogen production unit further includes a raw water tank 23 and a water replenishment pump 24. The raw water tank 23 is used to provide water required for hydrogen production by water electrolysis, and the water replenishment pump 24 is used to provide transportation power for the water.

[0097] Furthermore, the outlet of the raw water tank 23 is connected to the electrolytic water circulation loop, and the outlet of the raw water tank 23 is set on the pipeline between the outlet of the oxygen-water separator 2 (or the hydrogen-water separator 3) and the circulating water pump 37. The water in the raw water tank 23 is pumped into the electrolytic water circulation loop by the water replenishment pump 24 and participates in the circulation under the action of the circulating water pump 37.

[0098] The inlet of the raw water tank 23 is connected to a water replenishment port 25 through a pipeline, and the water replenishment port 25 can facilitate operators to add water required for hydrogen production.

[0099] Furthermore, the raw water tank 23 is also provided with a drain port, and the drain port of the raw water tank 23 is connected to the outside through a first drain port 26 of a pipe, so as to discharge the water in the raw water tank 23 out of the system.

[0100] In some embodiments, the production and supply system further includes a nitrogen purge replacement device 44, which is used to purge the hydrogen production unit, the purification unit and the boost supply unit, and the nitrogen purge replacement device 44 is electrically connected to the controller.

[0101] Preferably, the nitrogen purge replacement device 14 is connected to the oxygen-water separator 2 and the hydrogen-water separator 3 respectively through the nitrogen purge inlet, purges the deoxygenator 4, the condenser 1, and the hydrogen booster pipeline, and finally discharges the system from the discharge port 22.

[0102] In some embodiments, the preparation and supply system further includes: a safety protection unit for ensuring stable operation of the system, including: an alarm device and a concentration detection element electrically connected to the controller.

[0103] The above-mentioned controller is provided with an interlocking protection program. When the concentration value collected by the concentration detection element exceeds the concentration alarm value, the controller performs interlocking protection operations on the hydrogen production unit, purification unit and boost supply unit respectively, and the alarm device sends an alarm signal to remind the staff.

[0104] The above-mentioned interlocking protection operation can be to immediately and automatically stop the equipment in the above-mentioned hydrogen production unit, purification unit and boost supply unit, or cut off the relevant danger sources to prevent failures or accidents.

[0105] The above-mentioned concentration detection elements include: a hydrogen-in-oxygen concentration analyzer 27 , a hydrogen-in-oxygen concentration analyzer 28 , an ambient hydrogen concentration sensor 29 , and an ambient oxygen concentration sensor 30 .

[0106] Specifically, the oxygen-hydrogen concentration analyzer 27 and the hydrogen-oxygen concentration analyzer 28 are respectively arranged at the gas outlet of the oxygen-water separator 2 and the gas outlet of the hydrogen separator 3, and are used to respectively detect the oxygen concentration discharged from the oxygen-water separator 2 and the hydrogen concentration discharged from the hydrogen separator 3. They are used to respectively detect the concentration of hydrogen in the oxygen electrolyzed by the electrolyzer 1 and the concentration of oxygen in the hydrogen, so as to determine whether there is leakage inside the electrolyzer 1.

[0107] The ambient hydrogen concentration sensor 29 and the ambient oxygen concentration sensor 30 are used to respectively detect the oxygen concentration and the hydrogen concentration in the working area where the production and supply systems are located.

[0108] In practical applications, the system can be set in a chassis, and the ambient hydrogen concentration sensor 29 and the ambient oxygen concentration sensor 30 can detect the hydrogen concentration and oxygen concentration in the chassis. Once the hydrogen concentration (oxygen concentration) exceeds the hydrogen concentration alarm value (oxygen concentration alarm value), the equipment is immediately shut down.

[0109] For example, when the hydrogen concentration detected by the ambient hydrogen concentration sensor 29 reaches the hydrogen concentration alarm threshold, the power supply of the electrolyzer 1 and the solenoid valve on the pipeline connected to the hydrogen outlet are turned off to stop hydrogen production and cut off the flow of hydrogen to prevent further leakage of hydrogen.

[0110] The above-mentioned alarm device can be an audible and visual alarm.

[0111] The above-mentioned alarm device can be set with different alarm levels, that is, different hydrogen concentration alarm values ​​and hydrogen concentration alarm values, to remind the operator of the leakage degree of hydrogen and oxygen through sounds of different decibels and lights of different flashing frequencies.

[0112] In some embodiments, the control unit further includes a collection element and an adjustment element electrically connected to the controller, respectively. The collection element is used to transmit the collected actual physical quantity to the controller, the controller is used to process the actual physical quantity and transmit the processing result to the adjustment element, the adjustment element is used to perform corresponding actions according to the processing result of the controller, and at the same time, the controller also transmits the processing result to each device in the hydrogen production unit, the purification unit, and the boost supply unit to perform corresponding actions, and finally control the operating state of the system.

[0113] The above-mentioned collection elements include: a first pressure sensor 31, a first temperature sensor 32 and a first liquid level meter 33 arranged on the oxygen-water separator 2, which are used to measure the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the oxygen-water separator 2 respectively.

[0114] The second pressure sensor 34 , the second temperature sensor 35 and the second liquid level meter 36 arranged on the hydrogen-water separator 3 are used to measure the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the hydrogen-water separator 3 , respectively.

[0115] The hydrogen flow meter 38 and the hydrogen flow meter 28 are arranged on the pipeline between the outlet of the deoxidizer 4 and the inlet of the hydrogen boosting pipeline, and are used to detect the flow rate of the purified hydrogen.

[0116] The third pressure sensor 39 and the third pressure sensor 38 are arranged on the hydrogen boosting pipeline. Preferably, the third pressure sensor is arranged on the pipeline between the outlet of the gas-driven boosting pump 5 and the hydrogen filling port 6 for real-time detection of the hydrogen filling pressure.

[0117] Water flow meter 40, the water flow meter 40 is arranged at the raw water inlet 101 to detect the water entering the electrolytic cell 1. In the actual operation process, there are various possible reasons for water shortage in the system, and the water flow meter 40 transmits the monitored flow data to the controller in real time, and the controller controls the electrolytic cell 1 to stop electrolysis to prevent safety hazards.

[0118] The above-mentioned regulatory elements include:

[0119] The first hydrogen pressure-stabilizing valve 41 is arranged on the pipeline between the gas outlet of the hydrogen-water separator 3 and the inlet of the deoxidizer 4 to keep the pressure of the hydrogen entering the deoxidizer 4 stable.

[0120] The second hydrogen pressure stabilizing valve 42 is arranged on the pipeline between the gas outlet of the deoxidizer 4 and the gas-driven booster pump 5 to keep the pressure of the hydrogen entering the hydrogen booster pipeline stable.

[0121] The high-pressure hydrogen stabilizing valve 43 is arranged on the pipeline between the gas-driven booster pump 5 and the hydrogen filling port 6 to maintain the pressure of the hydrogen filling stable.

[0122] The regulating element also includes a solenoid valve arranged on each pipeline for controlling the on-off of the pipeline.

[0123] Preferably, each device and valve in the system adopts explosion-proof design, and the explosion-proof level of the main equipment is: the explosion-proof level of the solenoid valve is ExdIICT5 and above, the explosion-proof level of the acquisition component is ExdIICT6 and above, the explosion-proof level of the air compressor 8 is ExdIICT4 and above, and the explosion-proof level of the pressure regulating valve is ExdIICT4 and above. The safety design of this system is strictly implemented in accordance with national and industry specifications.

[0124] It should be noted that the interlocking protection program set in the above-mentioned controller also includes: high and low alarms and interlocking protection for the liquid level of the hydrogen-water separator, high and low alarms and interlocking protection for the liquid level of the oxygen separator, and the liquid level difference alarm and interlocking protection of the hydrogen and oxygen-water separators; high pressure alarm and interlocking protection for the hydrogen-water separator, high pressure alarm and interlocking protection for the oxygen-water separator; high temperature alarm and interlocking protection for the hydrogen-water separator, high temperature alarm and interlocking protection for the oxygen-water separator; high outlet temperature alarm and interlocking protection for the deoxidizer 4, high alarm and interlocking protection for the oxygen concentration in hydrogen, high alarm and interlocking protection for the hydrogen concentration in oxygen, high alarm and interlocking protection for the constant current source voltage high / low alarm and interlocking protection for the electrolyzer 1, high current alarm and interlocking protection for the constant current source of the electrolyzer 1, voltage rise and fall sudden change alarm and interlocking protection for the electrolyzer 1, water flow meter 40 switch alarm, etc.

[0125] When the above-mentioned interlocking protection program is triggered, the controller controls the various devices and regulating elements in the hydrogen production unit, purification unit and boost supply unit to perform corresponding actions to avoid safety hazards and protect the system.

[0126] In summary, the operation process of the above-mentioned preparation and supply system is as follows;

[0127] Before officially starting the process of producing hydrogen by water electrolysis, the nitrogen purge replacement device 14 is first started to purge the equipment and pipelines in the system.

[0128] After the nitrogen purge is completed, the controller controls the electrolytic cell 1 to start the water electrolysis hydrogen production process, the oxygen generated by the water electrolysis enters the oxygen-water separator 2 for gas-water separation, the separated oxygen is discharged from the system through the oxygen discharge port 7, and the hydrogen generated by the water electrolysis enters the hydrogen-water separator 3 for gas-water separation, and the water accumulated in the oxygen-water separator 2 and the hydrogen-water separator 3 re-enters the electrolytic cell 1 for the next round of circulation.

[0129] The hydrogen after most of the water is removed enters the purification unit, that is, enters the deoxidizer 4 from the gas outlet of the hydrogen-water separator 3, and removes oxygen under the action of the deoxidation catalyst. The concentration of the purified hydrogen can reach more than 99.999%. Then, it is cooled and dehydrated by the condenser 16 and enters the hydrogen booster pipeline for boosting.

[0130] After the purified hydrogen is pressurized by the gas-driven booster pump 5 and stabilized by the high-pressure hydrogen pressure-stabilizing valve 43, the third pressure sensor 39 detects whether the pressure meets the hydrogen pressure required by the hydrogen-using device. When the pressure meets the requirement, the high-pressure and high-purity hydrogen is input into the hydrogen-using device through the hydrogen filling port 6.

[0131] If the hydrogen pressure required by the hydrogen-using device is constant, the required hydrogen flow rate can be achieved by adjusting the electrolysis flow rate of the electrolytic cell 1 .

[0132] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A system for producing and supplying high-pressure and high-purity hydrogen, characterized in that: include: Hydrogen production unit, purification unit, booster supply unit and control unit; The control unit includes a controller, which is connected to and controls the operation of the hydrogen production unit, the purification unit and the boost supply unit; The hydrogen production unit comprises an electrolyzer, an oxygen-water separator, and a hydrogen-water separator. The electrolyzer is provided with a raw water inlet, an oxygen outlet, and a hydrogen outlet. The oxygen outlet and the hydrogen outlet are respectively connected to the gas inlet of the oxygen-water separator and the gas inlet of the hydrogen-water separator, and the liquid outlet of the oxygen-water separator and the liquid outlet of the hydrogen-water separator are both connected to the raw water inlet. The purification unit comprises a deoxidizer filled with a deoxidation catalyst, the inlet of the deoxidizer is connected to the gas outlet of the hydrogen-water separator, and the deoxidizer is used to remove oxygen and other impurities in the hydrogen; The boost supply unit comprises at least one hydrogen boost pipeline, the inlet of the hydrogen boost pipeline is connected to the outlet of the deoxidizer, and the outlet of the hydrogen boost pipeline is connected to the hydrogen filling port of the hydrogen using device; The hydrogen boosting pipeline is provided with a gas-driven boosting pump for boosting the pressure of the purified hydrogen to the pressure required by the hydrogen-using device.

2. The preparation and supply system according to claim 1, characterized in that: The boost supply unit also includes an air compressor and a pressure regulating device, wherein the air compressor is connected to the air-driven boost pump and is used to provide a boost air source for the air-driven boost pump; The pressure regulating device is arranged on the pipeline between the air compressor and the air-driven booster pump, and is used to adjust the pressure of the booster gas source.

3. The preparation and supply system according to claim 1, characterized in that: Also includes: A cooling system, the cooling system comprising a cooling water inlet pipeline, a cooling water outlet pipeline, a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are respectively arranged in the oxygen-water separator and the hydrogen-water separator, the cooling water inlet pipeline, the cold side of the first heat exchanger, the cold side of the second heat exchanger and the cooling water outlet pipeline are connected in sequence.

4. The preparation and supply system according to claim 1, characterized in that: The purification unit further comprises a condensate collector, a gas inlet of the condensate collector is connected to the outlet of the deoxidizer, a gas outlet of the condensate collector is connected to the inlet of the hydrogen boosting pipeline, and a liquid outlet of the condensate collector is connected to the outside.

5. The preparation and supply system according to claim 1, characterized in that: Also includes: a first discharge pipeline and a second discharge pipeline, The inlet of the first discharge pipeline is arranged on the pipeline between the outlet of the deoxidizer and the inlet of the hydrogen boosting pipeline, the outlet of the first discharge pipeline is connected to the outside atmosphere, and a manual discharge valve is arranged on the first discharge pipeline; The inlet of the second discharge pipeline is arranged on the pipeline between the outlet of the gas-driven booster pump and the hydrogen filling port, the outlet of the second discharge pipeline is connected to the outside atmosphere, and an automatic discharge valve is arranged on the second discharge pipeline, and the automatic discharge valve is electrically connected to the controller.

6. The preparation and supply system according to claim 1, characterized in that: The hydrogen production unit also includes a raw water tank and a water replenishment pump. The raw water tank is used to provide raw water required for hydrogen production by water electrolysis, and the water replenishment pump is used to provide transportation power for the raw water.

7. The preparation and supply system according to claim 1, characterized in that: Also includes: Safety protection unit used to ensure stable operation of the system; The safety protection unit includes: an alarm device and a concentration detection element electrically connected to the controller; The controller is provided with an interlocking protection program. When the concentration value collected by the concentration detection element exceeds the concentration alarm value, the controller performs interlocking protection operations on the hydrogen production unit, the purification unit and the boost supply unit respectively, and the alarm device sends an alarm signal to remind the staff. The concentration detection elements include: a hydrogen concentration analyzer in oxygen, an oxygen concentration analyzer in hydrogen, an ambient hydrogen concentration sensor, and an ambient oxygen concentration sensor; The hydrogen-in-oxygen concentration analyzer and the oxygen-in-hydrogen concentration analyzer are respectively arranged at the gas outlet of the oxygen-water separator and the gas outlet of the hydrogen separator, and are used to respectively detect the concentration of hydrogen in the oxygen and the concentration of oxygen in the hydrogen electrolyzed by the electrolyzer; The environmental hydrogen concentration sensor and the environmental oxygen concentration sensor are used to respectively detect the oxygen concentration and the hydrogen concentration in the working area where the production and supply system is located.

8. The preparation and supply system according to claim 1, characterized in that: The control unit also includes a collection element and an adjustment element electrically connected to the controller respectively. The collecting element comprises: a first pressure sensor, a first temperature sensor and a first liquid level meter arranged on the oxygen-water separator, for measuring the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the oxygen-water separator respectively; A second pressure sensor, a second temperature sensor and a second liquid level meter are arranged on the hydrogen-water separator, and are used to respectively measure the oxygen pressure, the temperature of the electrolyzed water and the liquid level of the electrolyzed water in the hydrogen-water separator; A hydrogen flow meter, which is arranged on the pipeline between the outlet of the deoxidizer and the inlet of the hydrogen boosting pipeline; a third pressure sensor, the third pressure sensor being arranged on the hydrogen boosting pipeline; A water flow meter, the water flow meter is arranged at the raw water inlet; The regulating element comprises: a first hydrogen pressure-stabilizing valve, which is arranged on a pipeline between a gas outlet of the hydrogen-water separator and an inlet of the deoxidizer; a second hydrogen pressure-stabilizing valve, the second pressure-stabilizing valve being arranged on a pipeline between the gas outlet of the deoxidizer and the gas-driven booster pump; A high-pressure hydrogen pressure-stabilizing valve is provided on the pipeline between the gas-driven booster pump and the hydrogen filling port.

9. The preparation and supply system according to claim 1, characterized in that: Also includes: A nitrogen purge replacement device is used to purge the hydrogen production unit, the purification unit and the boost supply unit.

10. The preparation and supply system according to claim 1, characterized in that: The deoxidation catalyst is a palladium catalyst and a room temperature platinum Pt catalyst.

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