A continuous proton exchange membrane pretreatment system and process for PEM water electrolysis

Abstract

The invention provides a continuous pretreatment system and process of a proton exchange membrane for PEM water electrolysis, and relates to the field of pretreatment of a proton exchange membrane for PEM water electrolysis. First, a hydrogen peroxide solution and a sulfuric acid solution are prepared, and then the proton exchange membrane is subjected to oxidation with the hydrogen peroxide solution, water washing after oxidation for more than two times, acidification with a sulfuric acid solution, water washing after acidification for more than two times, drying, and leveling for more than two times in sequence; multiple water washings are carried out after the oxidation treatment and the acidification treatment, and the temperature of the water washing tank is gradually reduced after the acidification and is close to the drying temperature, so that the proton exchange membrane can be prevented from being severely deformed due to thermal expansion and contraction, and the gradually reduced method can avoid affecting the mechanical properties of the proton exchange membrane in tension, thereby ensuring that the proton exchange membrane is continuously treated; the leveling pressure is controlled to be gradually reduced, so that the problem of swelling and deformation of the proton exchange membrane can be solved; finally, a coil with a protective film is obtained, which can be directly used for continuous coating production of CCM, thereby greatly improving the production efficiency of water electrolysis membrane electrodes.

Description

Technical Field

[0001] The invention belongs to the technical field of proton exchange membrane pretreatment for PEM water electrolysis, and in particular relates to a proton exchange membrane continuous pretreatment system and process for PEM water electrolysis. Background Art

[0002] In recent years, solid polymer electrolyte (PEM) water electrolysis technology has become a hot research topic in the field of hydrogen production due to its advantages of high efficiency, zero emission, compact structure, environmental friendliness, and high product purity. Its high-purity oxygen product has also been used in aerospace, medical, analysis and other fields. As the core component of PEM water electrolysis cells, the optimization of the membrane electrode structure to improve the electrolysis efficiency is the focus of researchers from various countries.

[0003] PEM water electrolysis hydrogen production uses perfluorosulfonic acid proton exchange membrane with good chemical stability, proton conductivity and gas separation as solid electrolyte, which can effectively prevent electron transfer and improve the safety of electrolyzer. The main components of PEM water electrolyzer are proton exchange membrane, cathode and anode catalyst layer, cathode and anode gas diffusion layer, cathode and anode end plates, etc. The diffusion layer, catalyst layer and proton exchange membrane constitute the membrane electrode, which is the main place for material transmission and electrochemical reaction of the entire water electrolyzer. The characteristics and structure of the membrane electrode directly affect the performance and life of the PEM water electrolyzer. In the membrane electrode, the proton exchange membrane not only conducts protons and isolates hydrogen and oxygen, but also provides support for the catalyst. Its performance directly determines the performance and service life of the water electrolyzer. At present, the proton exchange membrane used for water electrolysis hydrogen production is mostly perfluorosulfonic acid membrane, which has a complex preparation process and has long been monopolized by American and Japanese companies.

[0004] The most commonly used proton exchange membrane is Chemours Nafion TTM The series of membranes have the advantages of low electronic impedance, high proton conductivity, good chemical stability, mechanical stability, and gas permeability resistance. They are currently the most widely used proton exchange membranes for PEM water electrolysis hydrogen production. However, this series of proton exchange membranes need to be pre-treated before membrane electrode preparation.

[0005] This type of proton exchange membrane used for PEM water electrolysis must first be oxidized and acidified before use. However, considering the swelling problem of the proton exchange membrane, the swelling and deformation of the treated membrane is too large to be used for subsequent membrane electrode preparation. At present, the rolled proton exchange membrane can only be cut into suitable sheets, and then oxidized and acidified. The sheet processing not only cannot solve the swelling problem of the proton exchange membrane, but also cannot achieve roll-to-roll continuous processing. Therefore, it takes a long time, has low production efficiency, and is prone to mistakes that cause waste of materials; on the other hand, it cannot be used for the roll-to-roll continuous coating method to prepare the required membrane electrode CCM. Therefore, how to solve the current continuous pretreatment of proton exchange membranes for PEM water electrolysis and improve the production efficiency of PEM water electrolysis membrane electrodes is an urgent problem that needs to be solved. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a proton exchange membrane continuous pretreatment system and process for PEM water electrolysis to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides a continuous pretreatment system for proton exchange membrane for PEM water electrolysis, including a conveying system for unwinding, conveying and rewinding the proton exchange membrane, an oxidation treatment tank, a post-oxidation water washing tank, an acidification treatment tank, a post-acidification water washing tank, an oven and a pressing unit are sequentially arranged along the conveying direction of the conveying system, and temperature control devices are arranged in the oxidation treatment tank, the post-oxidation water washing tank, the acidification treatment tank and the post-acidification water washing tank, and the pressing unit is used to dry and level the proton exchange membrane.

[0008] Furthermore, the conveying system includes a driving device, a proton exchange membrane unwinding roller, a steering tensioning roller, a composite roller, a protective membrane unwinding roller and a proton exchange membrane winding roller. The proton exchange membrane unwinding from the proton exchange membrane unwinding roller passes through the oxidation treatment tank, the post-oxidation water washing tank, the acidification treatment tank, the post-acidification water washing tank, the oven and the pressing unit in sequence. The proton exchange membrane after being dried and leveled by the pressing unit passes through the composite roller, the protective membrane unwinding roller and the proton exchange membrane winding roller for protective membrane attachment and winding.

[0009] The post-oxidation water washing tank comprises a water washing tank 1 and a water washing tank 2 which are arranged in sequence and are used to wash the oxidation treatment solution on the proton exchange membrane;

[0010] The post-acidification water washing tank comprises a water washing tank 3, a water washing tank 4, a water washing tank 5 and a water washing tank 6 which are arranged in sequence and are used to wash the acidification treatment solution on the proton exchange membrane;

[0011] The clamping unit comprises a clamping assembly 1, a clamping assembly 2 and a clamping assembly 3 which are arranged in sequence and have the same structure. The clamping assembly 1 comprises two heated rotating rollers which are meshed and driven with each other.

[0012] Furthermore, the steering tension rollers in the oxidation treatment tank and the acid treatment tank are parallel to each other and are arranged in a staggered array. The oxidation treatment tank and the acid treatment tank are both provided with connecting brackets, and the steering tension rollers are fixed to the connecting brackets by electromagnetics.

[0013] Furthermore, each of the post-oxidation water washing tank and the post-acidification water washing tank is provided with a flowing water washing device, and the flowing water washing device comprises a water outlet mechanism and a supporting mechanism for the proton exchange membrane during the water washing process;

[0014] The support mechanism is a flat belt conveyor assembly, which is located directly below the section of the proton exchange membrane that needs to be flushed and is parallel to the proton exchange membrane and has the same conveying direction; an anti-friction plastic film layer is provided on the outside of the flat belt of the flat belt conveyor assembly;

[0015] The water outlet mechanism includes a frame assembly arranged on the post-oxidation water washing tank and the post-acidification water washing tank and a water outlet pipe arranged on the frame assembly. The frame assembly drives the water outlet pipe to achieve lifting and angular swing. The water outlet pipe is parallel to the wide side of the proton exchange membrane, and the water outlet is larger than the wide side of the proton exchange membrane.

[0016] Furthermore, the proton exchange membrane is transported in the post-oxidation water washing tank and the post-acidification water washing tank through a transport system, and the proton exchange membrane in the post-oxidation water washing tank and the post-acidification water washing tank is turned by a turning tension roller, so that the water outlet mechanism can perform flowing water washing on both sides of the proton exchange membrane;

[0017] Each of the post-oxidation water washing tank and the post-acidification water washing tank is provided with at least two proton exchange membrane front flushing sections and at least two proton exchange membrane back flushing sections. The proton exchange membrane front flushing section includes a water outlet mechanism and a supporting mechanism, and the water outlet mechanism washes the front of the proton exchange membrane with water. The proton exchange membrane back flushing section includes a water outlet mechanism and a supporting mechanism, and the water outlet mechanism washes the back of the proton exchange membrane with water.

[0018] The present invention provides a continuous pretreatment process of a proton exchange membrane for PEM water electrolysis, which comprises firstly preparing a hydrogen peroxide solution and a sulfuric acid solution of a certain concentration, and then sequentially subjecting the proton exchange membrane to oxidation with the hydrogen peroxide solution, washing with water after oxidation for more than two times, acidification with a sulfuric acid solution, washing with water after acidification for more than two times, drying, and leveling treatment for more than two times;

[0019] Among them, temperature control is performed during the hydrogen peroxide solution oxidation, water washing after oxidation, sulfuric acid solution acidification, water washing after acidification, drying and leveling treatment processes; the water washing temperature after oxidation is lower than the oxidation treatment temperature, and gradually decreases compared to the oxidation treatment temperature; the water washing temperature after acidification is lower than the acidification treatment temperature, and gradually decreases compared to the acidification treatment temperature; the drying treatment temperature is lower than the water washing temperature after acidification;

[0020] The drying process makes the proton exchange membrane in a semi-dry state with a water content of 30-50%;

[0021] The leveling process is achieved by pressurizing the proton exchange membrane, and the pressure is gradually reduced.

[0022] The number of water washing after oxidation and acidification is set according to needs, the purpose is to clean the solution. Too few times may lead to incomplete cleaning, and too many times will cause a large amount of deionized water waste. The total number of water washings is 5-8 times, preferably 6 times.

[0023] Furthermore, the above-mentioned PEM water electrolysis proton exchange membrane continuous pretreatment system is used; specifically comprising the following steps:

[0024] Step 1: prepare a hydrogen peroxide oxidation treatment solution, and pour the hydrogen peroxide oxidation treatment solution into an oxidation treatment tank; prepare a sulfuric acid acidification treatment solution, and pour the sulfuric acid acidification treatment solution into an acidification treatment tank;

[0025] Step 2: respectively controlling the temperature of the oxidation treatment tank, the water washing tank 1, the water washing tank 2, the acidification treatment tank, the water washing tank 3, the water washing tank 4, the water washing tank 5, the water washing tank 6 and the oven, as well as the temperature and pressure of the pressing assembly 1, the pressing assembly 2 and the pressing assembly 3;

[0026] Among them, the temperature of the water washing tank 1 and the water washing tank 2 is lower than the temperature of the oxidation treatment tank, and gradually decreases compared with the temperature of the oxidation treatment tank. The temperature of the water washing tank 3, the water washing tank 4, the water washing tank 5, and the water washing tank 6 is lower than the temperature of the acid treatment tank, and gradually decreases compared with the temperature of the acid treatment tank. The temperature of the oven is lower than the temperature of the water washing tank 6;

[0027] The pressure of the clamping component 1, the clamping component 2 and the clamping component 3 decreases gradually;

[0028] The number of steering tension rollers in the oxidation treatment tank and the acidification treatment tank is set according to the traction speed of the proton exchange membrane continuous pretreatment system; the drying temperature and time of the oven are controlled so that the proton exchange membrane is in a semi-dry state with a water content of 30-50%;

[0029] Step 3: Install the rolled proton exchange membrane without the protective film attached to the proton exchange membrane continuous pretreatment system, start the driving device of the conveying system to pull the belt, so that the proton exchange membrane passes through the oxidation treatment tank, the first water washing tank, the second water washing tank, the acidification treatment tank, the third water washing tank, the fourth water washing tank, the fifth water washing tank, the sixth water washing tank, the drying oven, the first pressing assembly, the second pressing assembly and the third pressing assembly in sequence;

[0030] Among them, the water washing pool 1, water washing pool 2, water washing pool 3, water washing pool 4, water washing pool 5 and water washing pool 6 all realize the flow-type flushing process of the proton exchange membrane in transmission through the water outlet mechanism. At the same time, the supporting mechanism and the proton exchange membrane are transmitted synchronously to realize the support of the proton exchange membrane.

[0031] Further, the concentration of the hydrogen peroxide oxidation treatment solution is 3-5wt.%, and the concentration of the sulfuric acid acidification treatment solution is 0.3-0.8mol / L;

[0032] The number of steering tension rollers in the oxidation treatment tank and the acidification treatment tank is 10-30, and the treatment time is 30-60 minutes.

[0033] Further, the oxidation treatment temperature is 60-90°C, and the acidification treatment temperature is 60-90°C;

[0034] The temperature of the water washing tank 1 is 40-70°C, the temperature of the water washing tank 2 is 30-60°C, the temperature of the water washing tank 3 is 50-80°C, the temperature of the water washing tank 4 is 45-70°C, the temperature of the water washing tank 5 is 40-60°C, and the temperature of the water washing tank 6 is 35-55°C;

[0035] The drying temperature of the oven is 30-50° C., and the drying time is 10-30 min.

[0036] Further, the conveying speed of the conveying system matches the oxidation and acidification treatment time, which is 0.05-0.2 m / min;

[0037] The direction of the water flushing in the water washing pool 1, water washing pool 2, water washing pool 3, water washing pool 4, water washing pool 5 and water washing pool 6 is opposite to the transmission direction of the proton exchange membrane. The flow rate of the water flushing is 1.5-2.5 times the transmission speed of the proton exchange membrane, and the flow rate is 1-4L / min.

[0038] Furthermore, the pressure at one clamping component is 4-8MPa and the temperature is 60-80°C, the pressure at two clamping components is 3-6MPa and the temperature is 40-60°C, and the pressure at three clamping components is 1-5MPa and the temperature is 30-50°C.

[0039] Furthermore, the protective film is any one of release polyethylene naphthalate PEN, release polyethylene terephthalate PET, release polyethylene film PE or release polypropylene film PP.

[0040] Beneficial effects:

[0041] 1. The present invention designs a process for the problem that the rolled proton exchange membrane currently used for PEM water electrolysis is severely swollen and deformed when encountering water and solvents, and cannot be subjected to continuous pretreatment. First, the concentration of oxidation treatment and acidification treatment is appropriately reduced, and the treatment temperature is further increased, thereby ensuring the treatment effect on the proton exchange membrane. Then, multiple water washing processes are performed after the oxidation treatment and acidification treatment, and the water washing process is subjected to flowing water flushing and flowing water heating treatment. The flowing water temperature of each washing tank after acidification is gradually reduced and is close to the subsequent drying temperature. Since the oxidation treatment and acidification need to be carried out at high temperature, the proton exchange membrane can be kept in a heated state during each flowing water flushing stage. On the one hand, the proton exchange membrane is prevented from being severely deformed due to thermal expansion and contraction. On the other hand, the gradual reduction method can prevent the rapid change of temperature from affecting the mechanical properties of the proton exchange membrane in tension, thereby affecting its service life, thereby ensuring quality. The proton exchange membrane is continuously processed. On the other hand, the flushing method of heated running water can make it easier to remove impurities on the surface of the proton exchange membrane, which is helpful for the subsequent leveling process of the proton exchange membrane after the surface is fully cleaned. Hot pressing and leveling are performed during the leveling process, and the proton exchange membrane has a drying function to obtain a completely dried and leveled proton exchange membrane. In the present invention, the first three leveling pressures cannot be too large. This is basic, but the present invention is designed to gradually decrease. The first one is the largest because it is relatively soft in a semi-wet state. Under greater pressure and certain temperature conditions, rapid leveling and shaping can be achieved. After that, as the proton exchange membrane gradually dries and becomes brittle, the subsequent two small pressure levelings can further consolidate it, thereby ensuring the leveling effect and solving the problem of swelling and deformation of the proton exchange membrane; finally, the protective film can be continuously attached to obtain a coil with a protective film, which can be directly used for the continuous coating production of CCM, greatly improving the production efficiency of water electrolysis membrane electrodes;

[0042] 2. After the acidification treatment, the present invention needs to be cleaned in multiple water washing tanks. Since the temperature of the oven drying is lower than the temperature of the acidification treatment, the temperatures of the multiple water washing tanks are successively reduced and gradually approach the oven temperature, so that the proton exchange membrane is dried at a mild temperature. High-temperature drying easily makes the proton exchange membrane brittle and cracks appear;

[0043] 3. When the water washing tank used in the present invention cleans the proton exchange membrane, the water in the water washing tank is in a flowing state, which makes the proton exchange membrane clean more thoroughly, avoids residual impurities on the surface, affects its performance and facilitates the subsequent leveling process; secondly, the flow rate of the flowing water is designed to be 1.5-2.5 times the transmission speed of the proton exchange membrane. Compared with the existing immersion cleaning process, the present invention can reduce the flushing time while ensuring sufficient cleaning, improve efficiency and ensure the continuous operation of the production line, that is, realize continuous processing;

[0044] 4. In the present invention, the proton exchange membrane is dried to a semi-dry state during oven drying, and then completely dried during roller pressing and leveling at the rear end; this is because the completely dried proton exchange membrane is severely swollen and deformed, which makes it difficult to level it and it is impossible to achieve complete leveling; on the other hand, the completely dried proton exchange membrane becomes brittle and cracks appear during the roller pressing and leveling process, which affects its use;

[0045] 5. Due to the long treatment time during oxidation and acidification treatment, the present invention designs a continuous pretreatment system compared to the existing immersion treatment method. In the oxidation treatment tank and the acidification treatment tank, a multi-roller steering method is used for treatment. The tension roller can be increased or decreased according to the treatment requirements of the proton exchange membrane. The system has the function of being able to be installed and removed, so that it can be applied to a variety of treatment processes and can realize the continuity of the production line, so as to be used in a batch continuous preparation system;

[0046] 6. The present invention designs a continuous treatment system for the continuous pretreatment process of proton exchange membrane, wherein each washing tank is designed with a flowing water washing device to achieve separate washing of the front and back sides of the proton exchange membrane, and the outlet pipe of the flowing water washing device is arranged parallel to the wide side of the proton exchange membrane, that is, the outlet pipe discharges water along the wide side of the proton exchange membrane to achieve complete flowing washing of the surface of the proton exchange membrane, ensuring sufficient and complete washing; further, while the outlet pipe is washing the proton exchange membrane, the present invention is also provided with a supporting mechanism, which is a flat belt transmission component, and the present application adopts a flat belt transmission component. The belt conveyor assembly can support the proton exchange membrane and convey it synchronously with the proton exchange membrane, thereby preventing the proton exchange membrane from being deformed and damaged under the action of running water flushing. The flat belt of the flat belt conveyor assembly is also wrapped with an anti-friction plastic film layer, further reducing the friction force during the contact process with the proton exchange membrane, thereby ensuring the protection effect of the proton exchange membrane. Compared with the existing roller-type conveyor, the present application purposefully selects the flat belt-type conveyor, which can form a planar form of complete support for the proton exchange membrane, thereby avoiding local stress deformation caused by water pressure, and thus having better support and protection effects.

[0047] The water outlet pipe of the present invention is designed to have a water outlet direction opposite to the transmission direction of the proton exchange membrane, and to limit the low-flow water outlet. Compared with the flushing with flowing water in the same direction as the transmission direction of the proton exchange membrane, this design of the present invention can prevent the dirty water and impurities flushed on the surface of the proton exchange membrane by the flowing water from continuing to be transmitted along with the proton exchange membrane, thereby affecting the cleaning effect of other parts of the proton exchange membrane. Therefore, the design of the present invention can further ensure the flushing effect while not causing damage to the reverse flushing of the proton exchange membrane.

[0048] 7. After a series of treatments of the proton exchange membrane are completed, the present invention attaches a protective membrane to the proton exchange membrane, which can prevent the membrane from swelling when preparing CCM by a roll-to-roll coating method, thereby affecting the production efficiency and use of the membrane electrode.

[0049] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of a continuous proton exchange membrane pretreatment system for PEM water electrolysis;

[0051] Figure 2 It is a schematic diagram of the distribution of the steering tension rollers in the oxidation treatment tank and the acid treatment tank;

[0052] Figure 3 It is a schematic diagram of the overall structure of the post-oxidation water washing tank and the post-acidification water washing tank;

[0053] Figure 4 It is a schematic diagram of the proton exchange membrane transported inside the water washing tank;

[0054] In the figure: 1. Conveying system; 1-1. Unwinding roller of proton exchange membrane; 1-2. Winding roller of proton exchange membrane; 1-3. Steering tensioning roller; 1-4. Composite roller; 1-5. Unwinding roller of protective membrane; 1-6. Connecting bracket; 2. Oxidation treatment tank; 3. Water washing tank 1; 3-2. Water washing tank 2; 3-3. Water washing tank 3; 3-4. Water washing tank 4; 3-5. Water washing tank 5; 3-6. Water washing tank 6; 4. Acidification treatment tank; 5. Oven; 6-1. Pressing component 1; 6-2. Pressing component 2; 6-3. Pressing component 3; 6-4. Heating rotating roller; 7. Proton exchange membrane; 8. Flow-type water washing device; 8-1. Water outlet mechanism; 8-1-1. Frame assembly; 8-1-2. Water outlet pipe; 8-2. Support mechanism; A. Front flushing section of proton exchange membrane; B. Back flushing section of proton exchange membrane. DETAILED DESCRIPTION

[0055] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0056] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0057] like Figure 1 As shown, the present invention provides a continuous pretreatment system of proton exchange membrane for PEM water electrolysis, including a conveying system 1, the conveying system 1 includes a driving device-servo motor, a proton exchange membrane unwinding roller 1-1, a plurality of steering tensioning rollers 1-3, a composite roller 1-4, a protective membrane unwinding roller 1-5 and a proton exchange membrane winding roller 1-2, after the proton exchange membrane 7 is rolled onto the proton exchange membrane unwinding roller 1-1, the proton exchange membrane 7 is tensioned and wound around each steering tensioning roller 1-3, and finally wound around the proton exchange membrane winding roller 1-2 to form a complete roll-to-roll conveying route, and an oxidation treatment tank 2, a water washing tank 1 3, a water washing tank 2 3-2, an acidification treatment tank 3-3 are sequentially arranged along the conveying direction of the conveying system 1. The treatment tank 4, the water washing tank three 3-3, the water washing tank four 3-4, the water washing tank five 3-5, the water washing tank six 3-6, the oven 5 and the clamping assembly one 6-1, the clamping assembly two 6-2 and the clamping assembly three 6-3 respectively composed of two heated rotating rollers 6-4 meshing with each other, the conveying system 1 sequentially passes through the oxidation treatment tank 2, the water washing tank one 3, the water washing tank two 3-2, the acidification treatment tank 4, the water washing tank three 3-3, the water washing tank four 3-4, the water washing tank five 3-5, the water washing tank six 3-6, the oven 5, the clamping assembly one 6-1, the clamping assembly two 6-2 and the clamping assembly three 6-3 and then are compounded with the protective membrane at the compounding roller 1-4, and finally are wound up at the proton exchange membrane winding roller 1-2.

[0058] In the present invention, the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, and the water washing tank 6 3-6 are all provided with a temperature control device (not shown in the figure), and the temperature control device adopts a temperature sensor device such as a thermocouple and a platinum resistor commonly used in the art to convert the temperature signal into an electrical signal, and controls the relay of a circuit such as a single chip microcomputer and a PLC to make the heating rod in the tank work or stop to achieve internal liquid temperature control;

[0059] like Figure 2As shown, the steering tensioning rollers 1-3 in the oxidation treatment tank 2 and the acidification treatment tank 4 are parallel to each other and are arranged in an interlaced array. A plurality of connecting brackets 1-6 are provided in the oxidation treatment tank 2 and the acidification treatment tank 4. The steering tensioning rollers 1-3 are fixed to the connecting brackets 1-6 by electromagnetics, that is, the steering tensioning rollers 1-3 can be assembled and disassembled by electromagnetic connection with the connecting brackets 1-6 to increase the number.

[0060] like Figure 3 As shown, each washing tank is provided with a flowing water washing device 8, and the flowing water washing device 8 includes a water outlet mechanism 8-1, and a supporting mechanism 8-2 for the proton exchange membrane 7 during the conveying and washing process. The proton exchange membrane 7 is conveyed in the washing tank by the conveying system 1, and the proton exchange membrane 7 in the washing tank is turned by the turning tension roller 1-3, so that the water outlet mechanism 8-1 can realize flowing water washing on both sides of the proton exchange membrane 7. Each washing tank is provided with at least two washing sections for the front side of the proton exchange membrane 7, and at least two washing sections for the back side of the proton exchange membrane 7, as shown in FIG. Figure 4 As shown, section A is the front flushing section of the proton exchange membrane, and section B is the back flushing section of the proton exchange membrane;

[0061] The support mechanism 8-2 is a flat belt conveyor assembly, which is located directly below the section of the proton exchange membrane 7 that needs to be flushed and is parallel to the proton exchange membrane 7 and has the same conveying direction. Figure 4 As shown, the direction indicated by the arrow in the figure is the direction of the proton exchange membrane 7 and the flat belt transmission; in order to reduce the contact friction between the flat belt transmission component and the proton exchange membrane 7, an anti-friction plastic film layer is also provided on the outside of the flat belt of the flat belt transmission component;

[0062] like Figure 3 and 4 As shown, the water outlet mechanism 8-1 includes a frame assembly 8-1-1 arranged on the water washing tank and a water outlet pipe 8-1-2 arranged on the frame assembly 8-1-1. The frame assembly 8-1-1 can drive the water outlet pipe 8-1-2 to achieve lifting and angular swinging. The frame assembly 8-1-1 can utilize electrical components such as motors and cylinders in combination with slide rails, rotating shafts, bearings and other structures to achieve lifting and angular swinging (this is a common method in the art, and the detailed structure is not shown in the figure); and in the present invention, the water outlet pipe 8-1-2 is parallel to the wide side of the proton exchange membrane 7, and the water outlet is larger than the wide side of the proton exchange membrane 7, so that the running water covering the entire surface of the proton exchange membrane 7 can be fully rinsed at the same time.

[0063] Embodiment 1:

[0064] (1) preparing an oxidation treatment solution, preparing a 3 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0065] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.3 mol / L, and loading the solution into the acidification treatment tank 4;

[0066] (3) setting the temperature of oxidation treatment tank 2 and acidification treatment tank 4 to 90° C. respectively, setting the temperature of water washing tank 1 3, water washing tank 2 3-2, water washing tank 3 3-3, water washing tank 4 3-4, water washing tank 5 3-5, and water washing tank 6 3-6 to 70° C., 60° C., 80° C., 70° C., 60° C., and 55° C., turning on the heating and flowing water washing device 8, setting the temperature of oven 5 to 50° C., and turning on the heating;

[0067] (4) setting the traction speed to 0.05 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 10, making the oxidation and acid treatment time 60 min, and the water flow rate of the washing tank to 1 L / min;

[0068] (5) The drying time of the oven 5 is set to 30 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 50% after drying;

[0069] (6) The pressure of the first pressing component 6-1 is set to 8 MPa and the temperature is set to 60°C, the pressure of the second pressing component 6-2 is set to 6 MPa and the temperature is set to 40°C, and the pressure of the third pressing component 6-3 is set to 5 MPa and the temperature is set to 30°C;

[0070] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 for re-drying and leveling treatment to obtain a completely dried proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene naphthalate (PEN) film is attached to complete the rolling, and the pre-treated proton exchange membrane roll with the protective film is obtained.

[0071] Embodiment 2:

[0072] (1) preparing an oxidation treatment solution, preparing a 5 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0073] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.8 mol / L, and loading the solution into the acidification treatment tank 4;

[0074] (3) setting the temperature of oxidation treatment pool 2 and acidification treatment pool 4 to 60° C. respectively, setting the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3 3-3, water washing pool 4 3-4, water washing pool 5 3-5, and water washing pool 6 3-6 to 40° C., 30° C., 50° C., 45° C., 40° C., and 35° C., turning on the heating and water flow devices, setting the temperature of oven 5 to 30° C., and turning on the heating;

[0075] (4) setting the traction speed to 0.2 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 30, so that the oxidation and acid treatment time is 30 min, and the water flow rate of the washing tank is 4 L / min;

[0076] (5) The drying time of the oven 5 is set to 10 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 30% after drying;

[0077] (6) The pressure of the first pressing component 6-1 is set to 4 MPa and the temperature is set to 70°C, the pressure of the second pressing component 6-2 is set to 3 MPa and the temperature is set to 60°C, and the pressure of the third pressing component 6-3 is set to 1 MPa and the temperature is set to 50°C;

[0078] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 for re-drying and leveling treatment to obtain a completely dried proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene terephthalate (PET) film is attached to complete the rolling, and the pre-treated proton exchange membrane roll with the protective film is obtained.

[0079] Embodiment 3:

[0080] (1) preparing an oxidation treatment solution, preparing a 4 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0081] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.5 mol / L, and loading the solution into the acidification treatment tank 4;

[0082] (3) setting the temperature of oxidation treatment pool 2 and acidification treatment pool 4 to 80° C. respectively, setting the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3 3-3, water washing pool 4 3-4, water washing pool 5 3-5, and water washing pool 6 3-6 to 60° C., 50° C., 70° C., 60° C., 50° C., and 45° C., turning on the heating and water flow devices, setting the temperature of oven 5 to 40° C., and turning on the heating;

[0083] (4) setting the traction speed to 0.1 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 20, so that the oxidation and acid treatment time is 40 min, and the water flow rate of the washing tank is 2 L / min;

[0084] (5) The drying time of the oven 5 is set to 20 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 40% after drying;

[0085] (6) The pressure of the first pressing component 6-1 is set to 6 MPa and the temperature is set to 65°C, the pressure of the second pressing component 6-2 is set to 5 MPa and the temperature is set to 50°C, and the pressure of the third pressing component 6-3 is set to 3 MPa and the temperature is set to 40°C;

[0086] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 for re-drying and leveling treatment to obtain a completely dried proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene film (PE) is attached to complete the rolling, and the pre-treated proton exchange membrane roll 7 with the protective film is obtained.

[0087] Comparative Example 1: (Oxidation and acidification treatments use conventional formulas: high concentration and normal temperature treatment)

[0088] (1) preparing an oxidation treatment solution, using a 30 wt. % hydrogen peroxide solution to prepare a 10 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0089] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a 2 mol / L sulfuric acid solution, and loading the solution into the acidification treatment tank 4;

[0090] (3) setting the temperature of oxidation treatment pool 2 and acidification treatment pool 4 to room temperature 25° C., setting the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3-3, water washing pool 4 3-4, water washing pool 5 3-5, and water washing pool 6 3-6 to 40° C., 30° C., 50° C., 45° C., 40° C., and 35° C., turning on the heating and water flow devices, setting the temperature of oven 5 to 30° C., and turning on the heating;

[0091] (4) setting the traction speed to 0.2 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 30, so that the oxidation and acid treatment time is 30 min, and the water flow rate of the washing tank is 4 L / min;

[0092] (5) The drying time of the oven 5 is set to 10 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 30% after drying;

[0093] (6) The pressure of the first pressing component 6-1 is set to 4 MPa and the temperature is set to 70°C, the pressure of the second pressing component 6-2 is set to 3 MPa and the temperature is set to 60°C, and the pressure of the third pressing component 6-3 is set to 1 MPa and the temperature is set to 50°C.

[0094] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 for re-drying and leveling treatment to obtain a completely dried proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene terephthalate (PET) film is attached to complete the rolling, and the pre-treated proton exchange membrane roll with the protective film is obtained.

[0095] Comparative Example 2: (No leveling treatment)

[0096] (1) preparing an oxidation treatment solution, preparing a 5 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0097] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.8 mol / L, and loading the solution into the acidification treatment tank 4;

[0098] (3) setting the temperature of oxidation treatment pool 2 and acidification treatment pool 4 to 60° C. respectively, setting the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3 3-3, water washing pool 4 3-4, water washing pool 5 3-5, and water washing pool 6 3-6 to 40° C., 30° C., 50° C., 45° C., 40° C., and 35° C., turning on the heating and water flow devices, setting the temperature of oven 5 to 30° C., and turning on the heating;

[0099] (4) setting the traction speed to 0.2 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 30, so that the oxidation and acid treatment time is 30 min, and the water flow rate of the washing tank is 4 L / min;

[0100] (5) The drying time of the oven 5 is set to 10 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 30% after drying;

[0101] (6) Installing the rolled proton exchange membrane 7 without the protective film on the production line, starting the conveying system 1 of the production line to pull the proton exchange membrane 7, so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, the oven 5 and the proton exchange membrane winding roller 1-2 in sequence;

[0102] When the proton exchange membrane 7 is rolled up, a release polyethylene terephthalate (PET) film is attached to complete the rolling up, thereby obtaining a pre-treated rolled proton exchange membrane 7 with a protective film.

[0103] Comparative Example 3: (Completely dried in oven)

[0104] (1) preparing an oxidation treatment solution, preparing a 5 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0105] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.8 mol / L, and loading the solution into the acidification treatment tank 4;

[0106] (3) setting the temperature of oxidation treatment pool 2 and acidification treatment pool 4 to 60° C. respectively, setting the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3 3-3, water washing pool 4 3-4, water washing pool 5 3-5, and water washing pool 6 3-6 to 40° C., 30° C., 50° C., 45° C., 40° C., and 35° C., turning on the heating and water flow devices, setting the temperature of oven 5 to 30° C., and turning on the heating;

[0107] (4) setting the traction speed to 0.2 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 30, so that the oxidation and acid treatment time is 30 min, and the water flow rate of the washing tank is 4 L / min;

[0108] (5) The drying time of the oven 5 is set to 30 min, so that the proton exchange membrane 7 is in a completely dry state after the drying is completed;

[0109] (6) The pressure of the first pressing component 6-1 is set to 4 MPa and the temperature is set to 70°C, the pressure of the second pressing component 6-2 is set to 3 MPa and the temperature is set to 60°C, and the pressure of the third pressing component 6-3 is set to 1 MPa and the temperature is set to 50°C.

[0110] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, the water washing tank 5 3-5, the water washing tank 6 3-6, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 for leveling treatment to obtain a completely dry proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene terephthalate (PET) film is attached to complete the rolling, and the pre-treated proton exchange membrane roll with the protective film is obtained.

[0111] Comparative Example 4: (After oxidation treatment and acidification treatment, soak in cold water twice each)

[0112] (1) preparing an oxidation treatment solution, preparing a 5 wt. % hydrogen peroxide solution from a 30 wt. % hydrogen peroxide solution, and loading the solution into an oxidation treatment tank 2;

[0113] (2) preparing an acidification treatment solution, diluting 98 wt.% concentrated sulfuric acid to a low-concentration sulfuric acid solution of 0.8 mol / L, and loading the solution into the acidification treatment tank 4;

[0114] (3) The temperature of oxidation treatment pool 2 and acidification treatment pool 4 is set to 60° C. respectively, the temperature of water washing pool 1 3, water washing pool 2 3-2, water washing pool 3 3-3, and water washing pool 4 3-4 is set to room temperature 25° C., the heating and water flow devices are turned on, the temperature of oven 5 is set to 30° C., and the heating is turned on;

[0115] (4) setting the traction speed to 0.2 m / min, the number of the steering tension rollers 1-3 for oxidation treatment and acid treatment to 30, so that the oxidation and acid treatment time is 30 min, and the water flow rate of the washing tank is 4 L / min;

[0116] (5) The drying time of the oven 5 is set to 10 min, so that the proton exchange membrane 7 is in a semi-dry state with a water content of 30% after drying;

[0117] (6) The pressure of the first pressing component 6-1 is set to 4 MPa and the temperature is set to 70°C, the pressure of the second pressing component 6-2 is set to 3 MPa and the temperature is set to 60°C, and the pressure of the third pressing component 6-3 is set to 1 MPa and the temperature is set to 50°C.

[0118] (7) The proton exchange membrane roll 7 without the protective film is installed on the production line, and the conveying system 1 of the production line is started to pull the proton exchange membrane 7 so that the proton exchange membrane 7 passes through the oxidation treatment tank 2, the water washing tank 1 3, the water washing tank 2 3-2, the acidification treatment tank 4, the water washing tank 3 3-3, the water washing tank 4 3-4, and the oven 5 in sequence, and then passes through the pressing component 1 6-1, the pressing component 2 6-2, and the pressing component 3 6-3 in sequence for re-drying and leveling treatment to obtain a completely dried proton exchange membrane 7; when the proton exchange membrane 7 is rolled up, a release polyethylene terephthalate (PET) film is attached to complete the rolling, and the pre-treated proton exchange membrane roll with a protective film is obtained.

[0119] As shown in Table 1, after the proton exchange membrane for water electrolysis of the present invention is subjected to continuous pretreatment, the prepared membrane electrode has excellent electrochemical activity. At an electrolysis voltage of 2.0 V, its current density is 2000 mA / cm 2 about.

[0120] In the comparative examples, in comparative example 1, a high-concentration oxidation treatment solution and a high-concentration acidification treatment solution are used, and the treatment is carried out at room temperature. On the one hand, the treated proton exchange membrane cannot be completely oxidized to remove organic impurities on the surface of the proton exchange membrane due to the low temperature, and the acidification effect is poor. On the other hand, the concentration of the treatment solution is too high, the cleaning is not thorough, and the pH value of the water flow in the final water washing tank is still lower than 7; in comparative example 2, no leveling treatment is performed. Since the proton exchange membrane has defects such as wrinkles after drying, the surface of the prepared membrane electrode is uneven, and the catalyst is unevenly distributed, resulting in poor performance; in comparative example 3, the proton exchange membrane has been completely dried before the leveling treatment. In the subsequent leveling process, the proton exchange membrane becomes brittle and cracks are generated, affecting the performance of the membrane electrode; in comparative example 4, after the oxidation treatment and the high-temperature acidification treatment, it immediately enters the cold water, and the alternation of cold and hot causes the internal structure of the proton exchange membrane to change, resulting in defects such as bulging and contraction, and since the number of water washings is reduced after the acidification treatment, there is residual acid solution, which affects the performance of the membrane electrode.

[0121] Table 1 Membrane electrode electrolysis current density table

[0122]

[0123]

[0124] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A continuous proton exchange membrane pretreatment system for PEM water electrolysis, characterized in that: It comprises a conveying system (1) for unwinding, conveying and rewinding a proton exchange membrane (7); an oxidation treatment tank (2), a post-oxidation water washing tank, an acidification treatment tank (4), a post-acidification water washing tank, an oven (5) and a pressing unit are sequentially arranged along the conveying direction of the conveying system (1); a temperature regulating device is arranged in each of the oxidation treatment tank (2), the post-oxidation water washing tank, the acidification treatment tank (4) and the post-acidification water washing tank; and the pressing unit is used for drying and leveling the proton exchange membrane (7); The conveying system (1) comprises a driving device, a proton exchange membrane unwinding roller (1-1), a steering tensioning roller (1-3), a composite roller (1-4), a protective membrane unwinding roller (1-5) and a proton exchange membrane winding roller (1-2); the proton exchange membrane (7) unwound by the proton exchange membrane unwinding roller (1-1) passes through the steering tensioning roller (1-3) and sequentially passes through the oxidation treatment tank (2), the post-oxidation water washing tank, the acidification treatment tank (4), the post-acidification water washing tank, the oven (5) and the pressing unit; the proton exchange membrane (7) dried and leveled by the pressing unit passes through the composite roller (1-4), the protective membrane unwinding roller (1-5) and the proton exchange membrane winding roller (1-2) for protective membrane attachment and winding; The post-oxidation water washing tank comprises a water washing tank 1 (3) and a water washing tank 2 (3-2) which are arranged in sequence and are used to wash the oxidation treatment solution on the proton exchange membrane (7); The post-acidification water washing tank comprises a water washing tank three (3-3), a water washing tank four (3-4), a water washing tank five (3-5) and a water washing tank six (3-6) which are arranged in sequence and are used to wash the acidification treatment solution on the proton exchange membrane (7); The pressing unit comprises a pressing assembly 1 (6-1), a pressing assembly 2 (6-2) and a pressing assembly 3 (6-3) which are arranged in sequence and have the same structure, and the pressing assembly 1 (6-1) comprises two heated rotating rollers (6-4) which are meshed and driven with each other; Each of the post-oxidation water washing tank and the post-acidification water washing tank is provided with a flowing water washing device (8), wherein the flowing water washing device (8) comprises a water outlet mechanism (8-1) and a supporting mechanism (8-2) for transmitting and simultaneously washing the proton exchange membrane (7); The support mechanism (8-2) is a flat belt conveyor assembly, which is located directly below the section of the proton exchange membrane (7) that needs to be flushed and is parallel to the proton exchange membrane (7) and has the same conveying direction; The water outlet mechanism (8-1) comprises a frame assembly (8-1-1) arranged on the post-oxidation water washing tank and the post-acidification water washing tank, and a water outlet pipe (8-1-2) arranged on the frame assembly (8-1-1); the frame assembly (8-1-1) drives the water outlet pipe (8-1-2) to achieve lifting and angular swing; the water outlet pipe (8-1-2) is parallel to the wide side of the proton exchange membrane (7), and the water outlet is larger than the wide side of the proton exchange membrane (7).

2. The continuous proton exchange membrane pretreatment system for PEM water electrolysis according to claim 1, characterized in that: The steering tension rollers (1-3) in the oxidation treatment tank (2) and the acid treatment tank (4) are parallel to each other and arranged in a staggered array. The oxidation treatment tank (2) and the acid treatment tank (4) are both provided with a connecting bracket (1-6). The steering tension rollers (1-3) are fixed to the connecting bracket (1-6) by electromagnetic means.

3. The continuous proton exchange membrane pretreatment system for PEM water electrolysis according to claim 2, characterized in that: The proton exchange membrane (7) is transported in the post-oxidation water washing tank and the post-acidification water washing tank via a transport system (1), and the proton exchange membrane (7) in the post-oxidation water washing tank and the post-acidification water washing tank is turned by a turning tension roller (1-3), so that the water outlet mechanism (8-1) can perform water-flowing flushing on both sides of the proton exchange membrane (7); Each of the post-oxidation water washing tank and the post-acidification water washing tank is provided with at least two proton exchange membrane front flushing sections (A) and at least two proton exchange membrane back flushing sections (B). The proton exchange membrane front flushing section (A) comprises a water outlet mechanism (8-1) and a support mechanism (8-2). The water outlet mechanism (8-1) washes the front surface of the proton exchange membrane (7). The proton exchange membrane back flushing section (B) comprises a water outlet mechanism (8-1) and a support mechanism (8-2). The water outlet mechanism (8-1) washes the back surface of the proton exchange membrane (7).

4. A PEM water electrolysis proton exchange membrane continuous pretreatment process using the PEM water electrolysis proton exchange membrane continuous pretreatment system as claimed in claim 3, characterized in that: Firstly, a hydrogen peroxide solution and a sulfuric acid solution of a certain concentration are prepared, and then the proton exchange membrane is subjected to oxidation with the hydrogen peroxide solution, water washing after oxidation for more than two times, acidification with the sulfuric acid solution, water washing after acidification for more than two times, drying, and leveling for more than two times in sequence; Among them, temperature control is performed during the hydrogen peroxide solution oxidation, water washing after oxidation, sulfuric acid solution acidification, water washing after acidification, drying and leveling treatment processes; the water washing temperature after oxidation is lower than the oxidation treatment temperature, and gradually decreases compared to the oxidation treatment temperature; the water washing temperature after acidification is lower than the acidification treatment temperature, and gradually decreases compared to the acidification treatment temperature; the drying treatment temperature is lower than the water washing temperature after acidification; The drying process makes the proton exchange membrane in a semi-dry state with a water content of 30-50%; The leveling process is achieved by pressurizing the proton exchange membrane, and the pressure is gradually reduced; The concentration of the hydrogen peroxide treatment solution is 3-5wt.%, and the concentration of the sulfuric acid acid treatment solution is 0.3-0.8mol / L; The number of the steering tension rollers (1-3) in the oxidation treatment tank (2) and the acidification treatment tank (4) is 10-30, and the treatment time is 30-60 minutes; The oxidation treatment temperature is 60-90°C, and the acidification treatment temperature is 60-90°C; The temperature of the first washing pool (3) is 40-70°C, the temperature of the second washing pool (3-2) is 30-60°C, the temperature of the third washing pool (3-3) is 50-80°C, the temperature of the fourth washing pool (3-4) is 45-70°C, the temperature of the fifth washing pool (3-5) is 40-60°C, and the temperature of the sixth washing pool (3-6) is 35-55°C; The drying temperature of the oven (5) is 30-50°C, and the drying time is 10-30 minutes.

5. The continuous pretreatment process of proton exchange membrane for PEM water electrolysis according to claim 4, characterized in that: The continuous pretreatment system for proton exchange membrane for PEM water electrolysis as claimed in claim 3 is used; specifically comprising the following steps: Step 1: preparing a hydrogen peroxide oxidation treatment solution, and pouring the hydrogen peroxide oxidation treatment solution into the oxidation treatment tank (2); Prepare a sulfuric acid acidification solution, and pour the sulfuric acid acidification solution into the acidification treatment tank (4); Step 2: respectively controlling the temperatures of the oxidation treatment tank (2), the water washing tank 1 (3), the water washing tank 2 (3-2), the acidification treatment tank (4), the water washing tank 3 (3-3), the water washing tank 4 (3-4), the water washing tank 5 (3-5), the water washing tank 6 (3-6) and the oven (5), as well as the temperatures and pressures of the pressing assembly 1 (6-1), the pressing assembly 2 (6-2) and the pressing assembly 3 (6-3); Among them, the temperature of the water washing tank 1 (3) and the water washing tank 2 (3-2) is lower than the temperature of the oxidation treatment tank (2), and gradually decreases compared with the temperature of the oxidation treatment tank (2); the temperature of the water washing tank 3 (3-3), the water washing tank 4 (3-4), the water washing tank 5 (3-5), and the water washing tank 6 (3-6) is lower than the temperature of the acid treatment tank (4), and gradually decreases compared with the temperature of the acid treatment tank (4); the temperature of the oven (5) is lower than the temperature of the water washing tank 6 (3-6); The pressures of the clamping assembly 1 (6-1), the clamping assembly 2 (6-2) and the clamping assembly 3 (6-3) are gradually reduced; The number of the steering tension rollers (1-3) in the oxidation treatment tank (2) and the acidification treatment tank (4) is set according to the traction speed of the proton exchange membrane continuous pretreatment system; the drying temperature and time of the oven (5) are controlled so that the proton exchange membrane (7) is in a semi-dry state with a water content of 30-50%; Step 3: installing the rolled proton exchange membrane (7) without the protective film attached thereto on the proton exchange membrane continuous pretreatment system, starting the driving device of the conveying system (1) to pull the proton exchange membrane (7) so that the proton exchange membrane (7) passes through the oxidation treatment tank (2), the first water washing tank (3), the second water washing tank (3-2), the acidification treatment tank (4), the third water washing tank (3-3), the fourth water washing tank (3-4), the fifth water washing tank (3-5), the sixth water washing tank (3-6), the drying oven (5), the first pressing component (6-1), the second pressing component (6-2) and the third pressing component (6-3) in sequence; The water washing tank 1 (3), water washing tank 2 (3-2), water washing tank 3 (3-3), water washing tank 4 (3-4), water washing tank 5 (3-5), and water washing tank 6 (3-6) all implement a water-flowing flushing process for the proton exchange membrane (7) being transported through a water outlet mechanism (8-1). At the same time, the support mechanism (8-2) is transported synchronously with the proton exchange membrane (7) to support the proton exchange membrane (7).

6. The continuous proton exchange membrane pretreatment process for PEM water electrolysis according to claim 5, characterized in that: The conveying speed of the conveying system (1) matches the oxidation and acidification treatment time and is 0.05-0.2 m / min; The direction of the water flushing in the water washing pool 1 (3), water washing pool 2 (3-2), water washing pool 3 (3-3), water washing pool 4 (3-4), water washing pool 5 (3-5) and water washing pool 6 (3-6) is opposite to the transmission direction of the proton exchange membrane (7), and the flow rate of the water flushing is 1.5-2.5 times the transmission speed of the proton exchange membrane (7), and the flow rate is 1-4L / min.

7. The continuous pretreatment process for PEM water electrolysis using a proton exchange membrane as claimed in claim 5 or 6, characterized in that: The pressure at the clamping component one (6-1) is 4-8MPa and the temperature is 60-80℃, the pressure at the clamping component two (6-2) is 3-6MPa and the temperature is 40-60℃, and the pressure at the clamping component three (6-3) is 1-5MPa and the temperature is 30-50℃.

8. The continuous proton exchange membrane pretreatment process for PEM water electrolysis according to claim 5, characterized in that: The protective film is any one of release polyethylene naphthalate PEN, release polyethylene terephthalate PET, release polyethylene film PE or release polypropylene film PP.

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