Deionizer for reducing conductivity of PEM electrolytic bath

Abstract

The utility model relates to the technical field of deionized water of a PEM high-voltage electrolytic bath and other water circulation with conductivity requirements, the deionizer is composed of a pressure-resistant stainless steel tank body, a tank body flange, a replaceable resin flange and other parts, and ion exchange resin is filled in the deionizer to effectively reduce the conductivity of water. The first stainless steel sintering net and the second stainless steel sintering net can prevent resin from overflowing, and system safety is guaranteed. The deionizer is connected to the main water path in parallel, the flow is controlled through conductivity detection, and the strict water quality requirement of the PEM electrolytic cell is met. The high-pressure deionizer solves the problem that a conventional deionizer cannot adapt to a high-pressure environment, the pressure resistance of the high-pressure deionizer is larger than or equal to 6 Mpa, and the high-pressure deionizer is made of corrosion-resistant SUS316L stainless steel materials, so that stable operation under high pressure is ensured. The PEM electrolytic tank is easy to maintain, the resin is convenient and fast to replace, and the hydrogen production efficiency and safety of the PEM electrolytic tank are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of deionized water of a PEM high-pressure electrolyzer and other water circulations with conductivity requirements, and in particular to a deionizer for reducing the conductivity of a PEM electrolyzer. Background Art

[0002] PEM electrolyzer process hydrogen production is a method of producing hydrogen using proton exchange membrane (PEM) water electrolysis technology. PEM electrolyzer process hydrogen production has the advantages of high efficiency, environmental protection, and flexibility, and is widely used in renewable energy power storage and conversion, transportation and industrial fields.

[0003] In the process of hydrogen production by PEM electrolyzer, the electrolyzer is the core equipment, which contains key components such as proton exchange membrane, cathode and anode, and catalyst. When a certain voltage is applied to the electrolyzer, water molecules undergo electrolysis under the action of the electric field to generate hydrogen and oxygen.

[0004] The PEM electrolyzer process for hydrogen production has extremely high requirements for the quality of electrolyzed water, among which conductivity is a key indicator, and the conductivity of electrolyzed water is usually required to be no more than 0.1μs / cm. At the same time, the PEM electrolyzer process for hydrogen production operates under a high-pressure environment, and the pressure usually reaches or exceeds 3Mpa. However, the conventional deionizer design on the market currently does not take this high-pressure environment into account, and its use conditions are generally limited to below 1Mpa. In addition, the conductivity of water treated by conventional water purifiers can only reach 0.5μs / cm, which is far from meeting the stringent requirements of PEM electrolyzers. Therefore, in order to ensure the water conditions of the PEM electrolyzer, a deionizer that reduces conductivity is developed and designed. Utility Model Content

[0005] The utility model provides a deionizer for reducing the conductivity of a PEM electrolyzer to solve the problem that the PEM electrolyzer process for hydrogen production operates under a high-pressure environment, and the pressure usually reaches or exceeds 3Mpa. However, the conventional deionizer design on the market currently does not take this high-pressure environment into consideration, and its use conditions are generally limited to below 1Mpa. In addition, the conductivity of water treated by a conventional water purifier can only reach 0.5μs / cm, which is far from meeting the stringent requirements of the PEM electrolyzer.

[0006] The utility model provides a deionizer for reducing the conductivity of a PEM electrolytic cell, comprising a stainless steel tank body, a tank body flange, a replacement resin flange, flange fixing screws, a first stainless steel sintered mesh, a second stainless steel sintered mesh, an inlet flange, and an outlet flange;

[0007] The interior of the stainless steel tank is provided with a cavity, and the cavity inside the stainless steel tank is used to fill the ion exchange resin;

[0008] The tank body flange is connected to the resin replacement flange by flange fixing screws, and the tank body flange is connected to the edge of the bottom opening of the stainless steel tank body. After the resin replacement flange is connected to the tank body flange, it is used to seal the bottom of the stainless steel tank body;

[0009] An inlet is arranged on the outer wall of one side of the stainless steel tank body, and a first stainless steel sintered mesh is installed at the inlet position; an outlet is arranged on the other side of the stainless steel tank body, and a second stainless steel sintered mesh is installed at the outlet position; an inlet flange is installed on the first stainless steel sintered mesh, and an outlet flange is installed on the second stainless steel sintered mesh.

[0010] Specifically, the pressure resistance of the stainless steel tank body 1 is ≥6Mpa, and the stainless steel material model used by the stainless steel tank body 1 is SUS316L.

[0011] Specifically, there is no gap between the ion exchange resin and the interior of the stainless steel tank body, and the ion exchange resin is in contact with water inside the stainless steel tank body.

[0012] Specifically, the first stainless steel sintered mesh and the second stainless steel sintered mesh are used to ensure that the ion exchange resin will not overflow into the high-pressure circulation pipeline when connected to the high-pressure circulation pipeline.

[0013] Beneficial effects of the utility model:

[0014] Efficiently reduce conductivity: The utility model can efficiently reduce the conductivity of water in the PEM electrolyzer through a specially designed deionizer structure, especially the use of ion exchange resin, meet the high requirements of the PEM electrolyzer process for water quality for hydrogen production, and help improve the efficiency and purity of hydrogen production.

[0015] Stable operation in high-pressure environment: Since the stainless steel tank body of the deionizer is made of SUS316L material with strong pressure resistance, the utility model can operate stably under pressures up to 6Mpa or higher, ensuring the safety and reliability of the equipment in the high-pressure working environment of the PEM electrolyzer.

[0016] Easy maintenance: The design of the tank flange and the resin replacement flange makes the replacement of ion exchange resin convenient and quick, which greatly reduces the maintenance difficulty and cost of the equipment and improves the use efficiency and life of the equipment.

[0017] Preventing resin overflow: By installing stainless steel sintered mesh at the inlet and outlet positions, the utility model effectively prevents the ion exchange resin from overflowing into the pipeline during the high-pressure circulation process, which not only protects the pipeline and subsequent equipment from being blocked or damaged by the resin, but also ensures the stability of the treated water quality.

[0018] In summary, the utility model significantly improves the efficiency and safety of hydrogen production by the PEM electrolyzer process by achieving multiple beneficial effects such as reducing electrical conductivity, adapting to high-voltage environments, simplifying maintenance, and preventing resin overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a practical application scenario of a deionizer for reducing the conductivity of a PEM electrolyzer provided by the utility model.

[0021] Figure 2 The utility model provides a schematic diagram of the side view of the deionizer for reducing the conductivity of a PEM electrolyzer.

[0022] Figure 3 The utility model provides a schematic diagram of the main cross-sectional structure of a deionizer for reducing the conductivity of a PEM electrolytic cell.

[0023] Illustration: 1- deionizer tank, 2- ion exchange resin, 3- deionizer tank flange, 4- resin replacement flange, 5- flange fixing screws, 6- deionized water inlet flange, 7- stainless steel sintered mesh, 8- deionized water outlet flange, 9- stainless steel sintered mesh. DETAILED DESCRIPTION

[0024] See also Figures 1 to 3 , the utility model embodiment provides a deionizer for reducing the conductivity of a PEM electrolyzer, comprising a stainless steel tank body 1, a tank body flange 3, a replacement resin flange 4, flange fixing screws 5, a first stainless steel sintered mesh 7, a second stainless steel sintered mesh 9, an inlet flange 6, and an outlet flange 8;

[0025] The interior of the stainless steel tank body 1 is set as a cavity, and the cavity inside the stainless steel tank body 1 is used to fill the ion exchange resin 2;

[0026] The tank flange 3 is connected to the replacement resin flange 4 via flange fixing screws 5, and the tank flange 3 is connected to the edge of the bottom opening of the stainless steel tank 1. After the replacement resin flange 4 is connected to the tank flange 3, it is used to seal the bottom of the stainless steel tank 1;

[0027] An inlet is arranged on the outer wall of one side of the stainless steel tank body 1, and a first stainless steel sintered mesh 7 is installed at the inlet position. An outlet is arranged on the other side of the stainless steel tank body 1, and a second stainless steel sintered mesh 9 is installed at the outlet position. An inlet flange 6 is installed on the first stainless steel sintered mesh 7, and an outlet flange 8 is installed on the second stainless steel sintered mesh 9.

[0028] Specifically, the pressure resistance of the stainless steel tank body 1 is ≥6Mpa, and the stainless steel material model used by the stainless steel tank body 1 is SUS316L.

[0029] Specifically, there is no gap between the ion exchange resin 2 and the interior of the stainless steel tank body 1 , and the ion exchange resin 2 is in contact with water inside the stainless steel tank body 1 .

[0030] Specifically, the first stainless steel sintered mesh 7 and the second stainless steel sintered mesh 9 are used to ensure that the ion exchange resin 2 does not overflow into the high-pressure circulation pipeline when connected to the high-pressure circulation pipeline.

[0031] The deionizer is connected in parallel to the main water circuit. There is a conductivity detector (G1 / W) on the deionization circulation water circuit to control the flow of the deionization bypass pipeline through conductivity detection.

[0032] The flow rate of the bypass pipeline of the deionizer is smaller than that of the main pipeline. A flow regulating valve is designed at the inlet of the deionizer to realize the flow control of the bypass pipeline of the deionizer.

[0033] The water inlet and outlet directions of the deionizer are required to be in from the bottom and out from the top, and have a corresponding residence time in the deionizer to achieve the purpose of adsorbing ions.

[0034] The deionizer is located in a high-pressure pipeline, and the ion exchange resin 2 placed inside has a diameter of 0.5-0.7mm, so it is easy to enter the high-pressure pipeline and cause damage to the equipment. Therefore, a stainless steel sintered filter with a mesh size of 120 is designed at the inlet and outlet of the deionizer to ensure that the circulating water circuit can be under high pressure conditions and the ion exchange resin cannot escape from the deionizer.

[0035] The inlet and outlet water pipes of the deionizer are connected to the system pipelines through flanges. The flange structure is used to replace the deionization resin of the deionizer. If the monitored conductivity continues to decrease, the customer is reminded to replace the ion exchange resin.

[0036] The utility model solves the problem of PEM electrolyzer process hydrogen production operating under high pressure environment, mainly through the following design innovations:

[0037] High-pressure adaptability design: The pressure resistance of the stainless steel tank 1 is designed to be ≥6Mpa, which is much higher than the pressure requirement of the PEM electrolyzer (usually reaching or exceeding 3Mpa). This ensures that the deionizer can work safely and stably under high-pressure environment. SUS316L stainless steel is selected, which is not only corrosion-resistant, but also has good pressure resistance, further enhancing the high-pressure adaptability of the deionizer.

[0038] Conductivity reduction technology: The ion exchange resin 2 filled inside the deionizer can effectively remove ions from the water, thereby reducing the conductivity of the water. This resin is in full contact with the water to ensure an efficient ion exchange process. By connecting in parallel to the main water line and using a conductivity detector (G1 / W) to monitor the conductivity in real time, the flow of the deionization bypass pipeline is controlled to ensure that the water quality meets the requirements of the PEM electrolyzer.

[0039] Structural optimization design: The first stainless steel sintered mesh 7 and the second stainless steel sintered mesh 9 are set to effectively prevent the ion exchange resin 2 from overflowing into the pipeline during the high-pressure circulation process, protecting other parts of the system from being blocked or damaged by the resin. The water inlet and outlet are designed to be bottom-in and top-out, ensuring that the water has enough residence time in the deionizer to fully adsorb ions. The inlet and outlet of the deionizer are designed with stainless steel sintered filter mesh (mesh number 120), which can effectively prevent the ion exchange resin from escaping even under high pressure conditions.

[0040] Easy maintenance: The design of the tank flange 3 and the resin replacement flange 4 makes the replacement of ion exchange resin simple and quick, reducing maintenance costs. The flange structure also ensures that the connection between the deionizer and the system pipeline is tight and reliable, reducing the risk of leakage.

[0041] The utility model is also applicable to PEM electrolysis hydrogen production equipment, PEM electrolyzer testing equipment, fuel cell engine system and fuel cell power generation system.

[0042] When the present invention is actually applied, the specific steps of use are as follows:

[0043] Install the deionizer: First, connect the deionizer to the high-pressure circulation pipe of the PEM electrolyzer system through the inlet and outlet flanges (inlet flange 6 and outlet flange 8). Make sure the connection is tight and there is no leakage.

[0044] Check and make sure that all connecting parts, such as flange fixing screws 5, are tightened to ensure that the system will not leak or loosen during operation.

[0045] Filling ion exchange resin: Open the tank flange 3 and the replacement resin flange 4, and fill the ion exchange resin 2 into the cavity of the stainless steel tank 1, making sure that the resin is filled tightly without gaps. Close and tighten the tank flange 3 and the replacement resin flange 4 to ensure that the resin does not leak.

[0046] System commissioning and operation: Before starting the PEM electrolyzer system, commission the deionizer to ensure that it works properly. Turn on the system and circulate water through the deionizer. Pay attention to the reading of the conductivity detector (G1 / W) to ensure that the conductivity is reduced to a level that meets the requirements of the PEM electrolyzer.

[0047] Flow Control and Regulation: Based on the feedback from the conductivity detector, the flow control valve in the deionizer bypass line is adjusted to control the amount of water passing through the deionizer to achieve the desired conductivity reduction effect.

[0048] Keep the water flow direction of the deionizer inlet and outlet downward and upward to ensure that the water has enough residence time in the deionizer to fully carry out ion exchange.

[0049] Maintenance and replacement of resin: Check the conductivity meter readings regularly. Once the conductivity begins to rise or no longer meets the requirements of the PEM electrolyzer, it means that the ion exchange resin is saturated.

[0050] When the resin needs to be replaced, the system is first shut down, and then the tank flange 3 and the resin replacement flange 4 are opened, the old resin is taken out and replaced with a new ion exchange resin 2 .

[0051] After replacement, re-tighten the flange and start the system, performing necessary commissioning to ensure the deionizer is functioning properly.

[0052] Safety precautions: Since the PEM electrolyzer system operates under high pressure, safety regulations must be strictly followed during operation to avoid safety accidents such as leakage or explosion. When performing any maintenance or replacement operations, be sure to shut down the system and release the pressure to ensure safe operation.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A deionizer for reducing the conductivity of a PEM electrolyzer, characterized in that: It comprises a stainless steel tank body (1), a tank body flange (3), a replacement resin flange (4), flange fixing screws (5), a first stainless steel sintered mesh (7), a second stainless steel sintered mesh (9), an inlet flange (6), and an outlet flange (8); The interior of the stainless steel tank body (1) is configured as a cavity, and the cavity inside the stainless steel tank body (1) is used to fill the ion exchange resin (2); The tank body flange (3) is connected to the replacement resin flange (4) via flange fixing screws (5), and the tank body flange (3) is connected to the edge of the bottom opening of the stainless steel tank body (1). After the replacement resin flange (4) is connected to the tank body flange (3), it is used to seal the bottom of the stainless steel tank body (1); An inlet is provided on the outer wall of one side of the stainless steel tank body (1), and a first stainless steel sintered mesh (7) is installed at the inlet position; an outlet is provided on the other side of the stainless steel tank body (1), and a second stainless steel sintered mesh (9) is installed at the outlet position; an inlet flange (6) is installed on the first stainless steel sintered mesh (7), and an outlet flange (8) is installed on the second stainless steel sintered mesh (9).

2. A deionizer for reducing the conductivity of a PEM electrolyzer according to claim 1, characterized in that: The stainless steel tank body (1) has a pressure resistance of ≥6Mpa, and the stainless steel material model used in the stainless steel tank body (1) is SUS316L.

3. A deionizer for reducing the conductivity of a PEM electrolyzer according to claim 1, characterized in that: There is no gap between the ion exchange resin (2) and the interior of the stainless steel tank body (1), and the ion exchange resin (2) is in contact with water inside the stainless steel tank body (1).

4. A deionizer for reducing the conductivity of a PEM electrolyzer according to claim 1, characterized in that: The first stainless steel sintered mesh (7) and the second stainless steel sintered mesh (9) are used to ensure that the ion exchange resin (2) will not overflow into the high-pressure circulation pipeline when connected to the high-pressure circulation pipeline.

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