Electrolytic cell with built-in gas-liquid separator and method of manufacturing the same

Abstract

The application discloses an electrolytic tank with a built-in gas-liquid separator and a manufacturing method thereof, and belongs to the technical field of electrolytic water. The electrolytic tank comprises an external electrolytic tank shell and an internal V-shaped chamber electrolytic tank; wherein the tip of the bottom of the V-shaped chamber electrolytic tank is provided with liquid inlet guide grooves on both sides, and the liquid inlet guide grooves are provided with liquid inlets; the top of the V-shaped chamber electrolytic tank is provided with a liquid outlet guide groove, and the liquid outlet guide groove is provided with a porous sieve plate. The manufacturing method comprises the following steps: (1) designing and processing the electrolytic tank shell and the position of the porous sieve plate; (2) assembling; (3) connecting pipelines, circuits, circulating pumps, alkali liquid tanks, alkali liquid filters and post-processing systems, and the electrolytic tank with the built-in gas-liquid separator is obtained. The electrolytic tank with the built-in gas-liquid separator can overcome the shortcomings of traditional gas-liquid separation technology, realize high integration of the electrolytic tank and the gas-liquid separator, simplify the system structure, improve the separation efficiency and the system stability, reduce the hydrogen production cost, and meet the needs of the rapid development of the hydrogen energy industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic water, more particularly to an electrolytic tank with a built-in gas-liquid separator and a manufacturing method thereof. BACKGROUND

[0002] Under the background of the global energy structure accelerating towards low-carbon and clean transformation, hydrogen energy, as a high-efficiency, clean and sustainable secondary energy, plays an increasingly important role in the energy field. Electrolytic water hydrogen production technology, with the advantages of clean production process and high product purity, has become the key path to obtain green hydrogen and has attracted widespread attention.

[0003] As the core equipment of electrolytic water hydrogen production, the performance of the electrolytic tank directly affects the efficiency, cost and quality of hydrogen production. The gas-liquid separation link is an indispensable part of the electrolytic water hydrogen production process, and is directly related to the purity of hydrogen, the stability of the system and the overall operating cost. However, in practical applications, the existing technology exposes many problems.

[0004] Traditional electrolytic tanks and gas-liquid separators are independent of each other. After the gas-liquid mixture flows out of the electrolytic tank, it needs to be transported to the external gas-liquid separator for separation. This not only leads to complex system piping and large floor area, but also reduces the overall efficiency of the system due to pressure loss in the gas-liquid transmission process. In addition, the risk of gas leakage in the pipeline increases, not only causing waste of hydrogen, but also possibly causing safety hazards. For example, some large green hydrogen projects use external gas-liquid separation systems. Due to the large number of connecting pipelines, the maintenance cost is high, and leakage problems frequently occur, seriously affecting the stable operation of the project.

[0005] In terms of separation efficiency, the common gravity type gas-liquid separator relies on the density difference between gas and liquid to achieve separation, but this method is low in efficiency, especially when dealing with high-flow gas-liquid mixtures, it is difficult to ensure the purity of hydrogen. When hydrogen contains a lot of water and impurities, it will cause corrosion to the subsequent hydrogen storage, transportation and application equipment, shorten the service life of the equipment, and increase the operating cost. For example, in high-pressure hydrogen storage equipment, due to the high water content in hydrogen, the equipment is corroded and needs to be replaced frequently, greatly increasing the operating cost.

[0006] In addition, in order to improve the separation effect, some traditional gas-liquid separators have to increase the size of the equipment, which not only increases the manufacturing cost of the equipment, but also slows down the response speed of the system, making it difficult to adapt to the volatility of renewable energy power generation. In wind and solar power hydrogen production projects, due to the intermittency of wind and solar energy, the load of the electrolytic tank changes frequently, and the traditional gas-liquid separator cannot respond in time, resulting in unstable hydrogen quality.

[0007] Therefore, how to develop a new type of gas-liquid separator is a problem that those skilled in the art need to solve. SUMMARY

[0008] Therefore, the electrolytic cell with a built-in gas-liquid separator and the manufacturing method thereof are provided to solve the problems in the prior art.

[0009] To achieve the above object, the present application adopts the following technical solutions:

[0010] The electrolytic cell with a built-in gas-liquid separator comprises an external electrolytic cell shell and an internal V-shaped chamber electrolytic cell.

[0011] The tip of the bottom of the V-shaped chamber electrolytic cell is provided with liquid inlet guide grooves on both sides, and the liquid inlet guide grooves are provided with liquid inlet holes.

[0012] The top of the V-shaped chamber electrolytic cell is provided with a liquid outlet guide groove, and the liquid outlet guide groove is provided with a porous sieve plate.

[0013] In the present application, the electrolytic cell shell is made of a PP plate and mainly plays the role of mechanical support and sealing protection.

[0014] The liquid inlet hole is a hole on both sides of the tip of the V-shaped chamber electrolytic cell, and the electrolytic cell liquid inlet hole is a key channel for electrolyte transmission and plays multiple core roles in the electrolysis process. It not only supplies raw materials for the electrolysis reaction as a "supply port", ensures the stable input of electrolyte solution participating in the reaction, but also undertakes the task of maintaining the constant liquid level in the tank. Stable liquid level ensures full contact between the electrode and the electrolyte, avoids damage to the exposed electrode, and maintains the stable space of the electrolysis reaction. In addition, the liquid inlet hole can dynamically adjust the electrolyte composition, supplement the consumed ions or remove the reaction byproducts in time, and ensure that the electrolyte concentration is in the best reaction interval. At the same time, the flowing electrolyte enters the electrolytic cell through the liquid inlet hole, which can effectively carry away the heat generated in the electrolysis process, prevent the tank body from affecting the efficiency or causing safety hazards due to high temperature, and finally, the liquid inlet hole and the liquid outlet port cooperatively build an electrolyte circulation system to promote the uniform distribution of the solution in the tank, eliminate local concentration differences, significantly improve the uniformity and current efficiency of the electrolysis reaction, and provide strong support for the efficient and stable operation of the electrolysis process.

[0015] Flow guide groove (liquid inlet flow guide groove and liquid outlet flow guide groove): The flow guide groove in the electrolytic cell plays a multiple and key role in the entire electrolytic system. It guides the electrolyte to flow uniformly in a reasonable path and direction through specific structural design, ensures the uniformity of electrolyte concentration around the electrode, effectively improves the uniformity and stability of the electrolytic reaction. The driven electrolyte flow can accelerate ion diffusion and migration, promote mass transfer process, reduce concentration polarization, and improve current efficiency. At the same time, the form and layout of the flow guide groove can optimize the electric field distribution, reduce the electric field distortion, improve the electric field utilization efficiency, and reduce the energy consumption. In addition, it can also guide the gas generated in the electrolysis process to be discharged in an orderly manner, avoid the accumulation of gas to hinder the reaction, and ensure the effective working area of the electrode. Finally, the uniform flow brought by the flow guide groove can reduce the erosion and corrosion of the electrolyte to the electrode and equipment components, prevent local overheating, and thus prolong the service life of the electrode and electrolytic cell, providing a strong guarantee for the efficient and stable operation of the electrolysis process.

[0016] Porous sieve plate: A multi-layer porous sieve plate is built in the liquid outlet flow guide groove as a gas-liquid separator, aiming to achieve efficient gas-liquid separation and stable fluid management. The porous sieve plate utilizes the density difference between gas and liquid to make the gas move upward and the liquid flow downward through the small holes when the gas-liquid mixture passes through, and the superposition of multiple layers further improves the separation efficiency; the small holes on the porous sieve plate can uniformly distribute the liquid, avoid liquid deflection, and ensure uniform flow field in the gas-liquid separator. Its large gas-liquid contact area promotes the formation of small gas bubbles and the full contact of liquid with gas, which is beneficial to gas dissolution or escape, and promotes gas-liquid separation and mass transfer. At the same time, the porous sieve plate can buffer the flow of gas-liquid mixture, reduce fluctuation impact, and maintain stable flow state. In addition, the porous sieve plate can also intercept solid impurities in the gas-liquid mixture, prevent downstream equipment from being blocked and worn, and through multiple synergistic effects, ensure the gas-liquid separation effect and guarantee the stable operation of the electrolytic system.

[0017] Further, the material of the electrolytic cell shell is PP plate.

[0018] Further, the shape of the electrolytic cell shell is a cuboid.

[0019] Further, the liquid inlet hole is symmetrically provided with two.

[0020] Further, the porous sieve plate is provided with multiple layers.

[0021] A manufacturing method of the above-mentioned electrolytic cell with built-in gas-liquid separator, specifically comprising the following steps:

[0022] (1) Design and process the electrolytic cell shell, and design the position of the porous sieve plate;

[0023] (2) Assemble the V-shaped chamber electrolytic cell, liquid inlet flow guide groove, liquid inlet hole, liquid outlet flow guide groove and porous sieve plate;

[0024] (3) connecting pipeline, circuit, circulating pump, lye tank, lye filter and post-processing system, namely.

[0025] Via the technical solution, compared with the prior art, the beneficial effects of the present application are as follows:

[0026] 1. Improve gas-liquid separation efficiency: through the innovative combination of multiple layers of porous sieve plates and flow guide grooves, the gas-liquid separation efficiency is greatly improved, compared with traditional external or single-layer separation structure, the separation precision can be improved by more than 30%, effectively reducing the gas-liquid entrainment phenomenon and reducing the subsequent processing pressure;

[0027] 2. Reduce volume and save space: built-in design replaces traditional external separator, significantly reduces the overall volume of the equipment, saves equipment installation space by 40%, improves the integration and compactness of the electrolytic cell, and facilitates large-scale industrial application;

[0028] 3. Energy saving: optimized flow channel structure and gas-liquid contact interface, reducing fluid resistance by 25%, reducing electrolyte circulation energy consumption, achieving energy saving;

[0029] 4. Prolong the service life of the equipment: the multi-layer sieve plate not only strengthens the gas-liquid separation, but also has the functions of impurity interception and uniform liquid distribution, avoiding the blockage and wear of downstream equipment, prolonging the service life of the equipment.

[0030] 5. Reduce cost: stable flow state control and buffer design significantly enhance system operation stability, reduce the risk of separation failure caused by gas-liquid fluctuation, reduce equipment maintenance frequency and cost; in addition, this design does not require complex external auxiliary equipment, simplifies the process flow, reduces equipment procurement and installation cost, improves enterprise economic benefit and market competitiveness.

[0031] 6. With the development of electrolytic water hydrogen production technology towards scale, high efficiency and intelligence, and the increasing demand for hydrogen purity and system stability, the present application designs a new type of built-in gas-liquid separator electrolytic cell, which can overcome the shortcomings of traditional gas-liquid separation technology, realize high integration of electrolytic cell and gas-liquid separator, simplify system structure, improve separation efficiency and system stability, and reduce hydrogen production cost, to meet the demand of hydrogen energy industry rapid development.

[0032] 7、The electrolytic cell with the built-in gas-liquid separator can solve the problems of low separation efficiency, high energy consumption, large space occupation and poor running stability in the gas-liquid separation process of the traditional electrolytic cell, and can realize rapid and efficient gas-liquid separation, reduce the energy consumption in the separation process, reduce the space occupation of the external separator, improve the overall integration and compactness of the electrolytic cell, enhance the stability and reliability of the gas-liquid separation process, effectively avoid the problems of gas-liquid entrainment and blockage, improve the running efficiency and service life of the electrolytic cell, and meet the needs of industrial production for efficient, energy-saving and stable gas-liquid separation. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0034] Figure 1 FIG. 1 is a structural schematic diagram of the electrolytic cell with the built-in gas-liquid separator in Embodiment 1 of the present application.

[0035] In the drawings, 1 is an electrolytic cell shell, 2 is a V-shaped chamber electrolytic cell, 3 is a liquid inlet flow guide groove, 4 is a liquid inlet hole, 5 is a liquid outlet flow guide groove, and 6 is a porous sieve plate. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application.

[0038] In addition, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered sequence. Thus, features having a "first", "second" or "third" designation can include one or more of the features, either explicitly or implicitly.

[0039] In the present application, unless specifically defined otherwise and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless specifically defined otherwise and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] Embodiment 1

[0042] The electrolytic cell with built-in gas-liquid separator comprises an external electrolytic cell shell 1 and an internal V-shaped chamber electrolytic cell 2;

[0043] The electrolytic cell shell 1 is a cuboid made of PP plate;

[0044] The V-shaped chamber electrolytic cell 2 is provided with liquid inlet guide grooves 3 on both sides of the tip of the bottom, and two liquid inlet holes 4 are symmetrically arranged in the liquid inlet guide grooves 3;

[0045] The V-shaped chamber electrolytic cell 2 is provided with a liquid outlet guide groove 5 at the top, and a plurality of porous sieve plates 6 are arranged in the liquid outlet guide groove 5.

[0046] Embodiment 2

[0047] The manufacturing method of the electrolytic cell with built-in gas-liquid separator in embodiment 1 comprises the following steps:

[0048] (1) Design and process the electrolytic cell shell 1, and design the position of the porous sieve plate 6;

[0049] (2) Assemble the V-shaped chamber electrolytic cell 2, the liquid inlet flow guide groove 3, the liquid inlet hole 4, the liquid outlet flow guide groove 5 and the porous screen plate 6;

[0050] (3) Connect the pipeline, circuit, circulating pump, lye tank, lye filter and post-processing system, and the product is obtained.

[0051] Comparative Example 1

[0052] The electrolytic cell without built-in gas-liquid separator comprises an external electrolytic cell shell 1 and an internal V-shaped chamber electrolytic cell 2.

[0053] The electrolytic cell shell 1 is a cuboid made of a PP plate.

[0054] The V-shaped chamber electrolytic cell 2 is provided with a liquid inlet flow guide groove 3 at the bottom of the tip of the V-shaped chamber electrolytic cell 2, and two liquid inlet holes 4 are symmetrically arranged in the liquid inlet flow guide groove 3.

[0055] The V-shaped chamber electrolytic cell 2 is provided with a liquid outlet flow guide groove 5 at the top of the V-shaped chamber electrolytic cell 2.

[0056] Comparative Example 2

[0057] The manufacturing method of the electrolytic cell without built-in gas-liquid separator in Comparative Example 1 comprises the following steps:

[0058] (1) Design and process the electrolytic cell shell 1;

[0059] (2) Assemble the V-shaped chamber electrolytic cell 2, the liquid inlet flow guide groove 3, the liquid inlet hole 4 and the liquid outlet flow guide groove 5;

[0060] (3) Connect the pipeline, circuit, circulating pump, lye tank, lye filter and post-processing system, and the product is obtained.

[0061] Performance test

[0062] The electrolyte solution was added into the electrolytic cell with built-in gas-liquid separator in Example 1 and the electrolytic cell without built-in gas-liquid separator in Comparative Example 1, respectively, and the water electrolysis reaction for hydrogen production was started by applying a constant current. The electrolytic cell voltage under different currents was recorded, and the energy consumption was calculated. The electrolysis time was recorded, and the electrolysis efficiency was calculated.

[0063] The results are shown in Table 1.

[0064] Table 1 Energy consumption and electrolysis efficiency of the electrolytic cell in Example 1 and Comparative Example 1

[0065] Electrolytic cell Current density (A / m 2 )]]> Voltage (V) Energy consumption (kwh / m 3 )]]> Electrolysis efficiency (%) Comparative Example 1 3000 1.89 4.52 80 Example 1 3000 1.80 4.30 88

[0066] As can be seen from Table 1, compared with the electrolytic cell without built-in gas-liquid separator of Comparative Example 1, the energy consumption of the water electrolysis hydrogen production reaction of the electrolytic cell with built-in gas-liquid separator of Example 1 is significantly reduced, and the electrolysis efficiency is significantly improved.

[0067] The foregoing description of the disclosed embodiments enables a person skilled in the art to carry out or use the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrolyzer with a built-in gas-liquid separator, characterized in that, The electrolytic tank comprises an outer electrolytic tank shell and an inner V-shaped chamber electrolytic tank. The bottom of the V-shaped chamber electrolytic tank is provided with liquid inlet guide grooves on both sides of the tip of the bottom, and the liquid inlet guide grooves are provided with liquid inlets. The top of the V-shaped chamber electrolytic tank is provided with liquid outlet guide grooves, and the liquid outlet guide grooves are provided with porous sieve plates.

2. An electrolytic cell with a built-in gas-liquid separator according to claim 1, characterized in that, The material of the electrolytic tank shell is PP plate.

3. An electrolytic cell with a built-in gas-liquid separator as claimed in claim 1, characterized in that, The shape of the electrolytic tank shell is cuboid.

4. The electrolyzer with a built-in gas-liquid separator according to claim 1, characterized in that, The liquid inlets are symmetrically provided with two.

5. The electrolyzer cell with a built-in gas-liquid separator according to claim 1, wherein, The porous sieve plates are provided with multiple layers.

6. A method of manufacturing an electrolytic cell with a built-in gas-liquid separator as claimed in claim 1, characterized in that, Specifically, the method comprises the following steps: (1) design and process the electrolytic tank shell, and design the position of the porous sieve plate; (2) assemble the V-shaped chamber electrolytic tank, the liquid inlet guide groove, the liquid inlet, the liquid outlet guide groove and the porous sieve plate; (3) connect the pipeline, the circuit, the circulating pump, the alkali tank, the alkali filter and the post-treatment system, and the method is completed.

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