A cylindrical alkaline water electrolyzer internally embedded with a spiral ribbon

Abstract

The application provides a cylindrical alkaline water electrolysis cell internally embedded with spiral belts, and belongs to the electrolysis field. The application solves the problem of gas accumulation on the surfaces of cathode electrodes and anode electrodes of the alkaline water electrolysis cell. In the structure, a diaphragm divides the space in the cylindrical cell body into a cathode chamber and an anode chamber, the anode chamber is close to the center of the cylindrical cell body relative to the cathode chamber, the upper end and the lower end of the cathode chamber are respectively connected with a cathode gas-liquid outlet and a cathode liquid inlet, the upper end and the lower end of the anode chamber are respectively connected with an anode gas-liquid outlet and an anode liquid inlet, an anode electrode is located in the anode chamber, and a cathode electrode is located in the cathode chamber; the spiral belt structure comprises a cathode spiral belt and an anode spiral belt, the two sides of the anode spiral belt are respectively in contact with the anode electrode and the diaphragm, the two sides of the cathode spiral belt are respectively in contact with the cathode electrode and the diaphragm, the cathode spiral belt spirally extends around the outer surface of the diaphragm, and the anode spiral belt spirally extends around the outer surface of the anode electrode. The application can reduce the gas coverage rate on the electrode surface.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrolysis, and particularly relates to a cylindrical alkaline water electrolyzer internally embedded with a spiral belt. BACKGROUND

[0002] In the process of water electrolysis, hydrogen bubbles and oxygen bubbles formed by electrochemical reactions can become the main source of resistance of water electrolysis. The reason is that these bubbles cover the surface of the cathode electrode and the anode electrode, reducing the active area. From a microscopic point of view, the bubbles isolate the active sites on the cathode electrode and the anode electrode. In addition, the surface of these bubbles can cause micro-convection, which pushes the electrolyte in a direction away from the cathode electrode and the anode electrode, resulting in an increase in overpotential and ohmic resistance.

[0003] In the prior art, most alkaline water electrolyzers adopt a spherical concave-convex structure. The application of the spherical convex-spherical concave structure in the alkaline water electrolyzer has a dual effect. On the one hand, the spherical convex structure can provide support for the electrode mesh, while reducing the electrolyte resistance by increasing the contact area. On the other hand, the spherical convex-spherical concave structure can induce the formation of eddy currents in the electrode chamber, which helps to evenly distribute the electrolyte. However, the eddy currents can also cause gas entrainment, making it difficult for the gas to be discharged in time, thereby causing gas accumulation on the surface of the cathode electrode and the anode electrode. This accumulation can affect the contact efficiency between the electrodes and the electrolyte, thereby causing an increase in the cell voltage, an increase in energy consumption, and low efficiency and energy conversion rate of the electrochemical reaction.

[0004] Therefore, there is an urgent need for an alkaline water electrolyzer that can reduce the amount of gas on the surface of the electrodes, thereby improving the efficiency and energy conversion rate of the electrochemical reaction. SUMMARY

[0005] In view of this, in order to solve the problem of gas accumulation on the surface of the cathode electrode and the anode electrode in the alkaline water electrolyzer in the prior art, which affects the contact efficiency between the electrodes and the electrolyte, thereby causing an increase in the cell voltage, an increase in energy consumption, and low efficiency and energy conversion rate of the electrochemical reaction, the present application proposes a cylindrical alkaline water electrolyzer internally embedded with a spiral belt.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A cylindrical alkaline water electrolyzer internally embedded with a spiral belt, comprising:

[0008] a cylindrical tank body, the lower part of the cylindrical tank body is provided with an anode liquid inlet and a cathode liquid inlet, and the upper part of the cylindrical tank body is provided with an anode gas-liquid outlet and a cathode gas-liquid outlet;

[0009] A diaphragm is fixedly arranged in the cylindrical tank, and the diaphragm divides the space in the cylindrical tank into a cathode chamber and an anode chamber. The anode chamber is close to the center of the cylindrical tank relative to the cathode chamber. The upper end and the lower end of the cathode chamber are in communication with the cathode gas-liquid outlet and the cathode liquid inlet respectively. The upper end and the lower end of the anode chamber are in communication with the anode gas-liquid outlet and the anode liquid inlet respectively.

[0010] An anode electrode is arranged in the anode chamber.

[0011] A cathode electrode is arranged in the cathode chamber.

[0012] A spiral belt structure includes a cathode spiral belt and an anode spiral belt. The two sides of the anode spiral belt are in contact with the anode electrode and the diaphragm respectively. The two sides of the cathode spiral belt are in contact with the cathode electrode and the diaphragm respectively. The cathode spiral belt spirally extends around the outer surface of the diaphragm, and the anode spiral belt spirally extends around the outer surface of the anode electrode.

[0013] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the anode electrode, the diaphragm and the cathode electrode are all cylindrical and are concentrically arranged.

[0014] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt further includes a rotating electrolyte structure arranged at the lower end of the cylindrical tank, which can make the electrolyte entering the anode liquid inlet and the cathode liquid inlet in a rotating state.

[0015] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the included angle between the anode spiral belt and the anode liquid inlet is 30°-60°, and the included angle between the cathode spiral belt and the cathode liquid inlet is 30°-60°.

[0016] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the number of turns of the anode spiral belt around the anode electrode is 1-4 turns, and the number of turns of the cathode spiral belt around the diaphragm is 1-4 turns.

[0017] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the height of the anode spiral belt around the anode electrode is 1000mm-10000mm, and the height of the cathode spiral belt around the diaphragm is 1000mm-10000mm.

[0018] As a preferred scheme of the cylindrical alkaline water electrolysis tank with the internal embedded spiral belt, the thickness of the cathode spiral belt and the thickness of the anode spiral belt are both 0.2mm-2mm.

[0019] As a preferred scheme of the above-mentioned cylindrical alkaline water electrolysis cell with internally embedded spiral strips, the upper end and the lower end of the cylindrical cell body are fixedly provided with polar frames, and the cathode spiral strip and the anode spiral strip are fixedly arranged in the polar frames, and the cathode electrode and the anode electrode are detachably arranged in the polar frames.

[0020] As a preferred scheme of the above-mentioned cylindrical alkaline water electrolysis cell with internally embedded spiral strips, the cathode spiral strip is of an integral molding structure; and the anode spiral strip is of an integral molding structure.

[0021] As a preferred scheme of the above-mentioned cylindrical alkaline water electrolysis cell with internally embedded spiral strips, the cylindrical alkaline water electrolysis cell with internally embedded spiral strips further comprises a cathode terminal post and an anode terminal post, the cathode terminal post is arranged at the cathode electrode, and the anode terminal post is arranged at the anode electrode.

[0022] Compared with the prior art, the cylindrical alkaline water electrolysis cell with internally embedded spiral strips provided by the present application has the following beneficial effects:

[0023] 1. The present application provides a cylindrical alkaline water electrolysis cell with internally embedded spiral strips, electrolyte enters the cathode chamber from the cathode liquid inlet, and is discharged from the cathode gas-liquid outlet after reaction, and the cathode gas-liquid outlet serves as a gas discharge port; electrolyte enters the anode chamber from the anode liquid inlet, and is discharged from the anode gas-liquid outlet after reaction, and the anode gas-liquid outlet serves as a gas discharge port. The cathode spiral strip can generate stable and uniform longitudinal vortex flow in the cathode chamber, and the anode spiral strip can generate stable and uniform longitudinal vortex flow in the anode chamber. The electrolyte starts to rotate as it enters the cathode liquid inlet and the anode liquid inlet, and in combination with the cathode spiral strip and the anode spiral strip, the electrolyte and the gas flow along the extension direction of the cathode spiral strip and the anode spiral strip, and the rotation of the electrolyte can effectively reduce the gas coverage rate on the surface of the cathode electrode and the anode electrode, which is conducive to the diffusion of the gas, thereby improving the problem of gas accumulation on the surface of the cathode electrode and the anode electrode in the alkaline water electrolysis cell. Since the cathode chamber and the anode chamber are provided with the same flow rate, but the cross-sectional area of the cathode chamber is larger, the speed of the electrolyte in the anode chamber is higher, and the electrolyte tends to impact the anode electrode, so that the oxygen generated by the anode electrode is carried away by the electrolyte. In the cathode chamber, the electrolyte spirally rises, and due to the action of centrifugal force, the flow rate of the electrolyte on the outside is higher than that on the inside, the outside is the side close to the cathode electrode, and the inside is the side close to the diaphragm, the pressure on the outside is higher than that on the inside, thereby promoting the hydrogen generated by the cathode electrode to gradually accumulate on the side with lower pressure, i.e. the inside, which is close to the diaphragm and away from the cathode electrode, so that the hydrogen content on the surface of the cathode electrode is reduced.

[0024] The hydrogen generated by the cathode electrode is brought away from the cathode electrode by the centrifugal force generated by the spiral rising of the electrolyte in the cathode chamber, and is close to the diaphragm, reducing the hydrogen retention on the surface of the cathode electrode. The oxygen generated by the anode electrode is brought away from the anode electrode by the high flow rate of the electrolyte in the anode chamber. The gas coverage rate on the surface of the cathode electrode and the anode electrode can be effectively reduced, which is beneficial to the diffusion of the gas, and has smaller flow loss, improves the contact efficiency between the cathode electrode, the anode electrode and the electrolyte, and improves the efficiency of the electrochemical reaction and the energy conversion rate.

[0025] 2. The application provides an internally embedded spiral belt cylindrical alkaline water electrolysis tank, the two sides of the anode spiral belt are in contact with an anode electrode and a diaphragm respectively, and the two sides of the cathode spiral belt are in contact with a cathode electrode and the diaphragm respectively, so that the sealing property and stability of the structure are ensured, and the technical effect of not affecting the flow rate is achieved.

[0026] Moreover, the internally embedded spiral belt cylindrical alkaline water electrolysis tank does not need to punch the cathode electrode and the anode electrode, different cathode electrodes and anode electrodes can be replaced, the processing is simpler, and the maintenance is convenient, and the manufacturing and maintenance costs are reduced.

[0027] 3. The application provides an internally embedded spiral belt cylindrical alkaline water electrolysis tank, the internally embedded spiral belt cylindrical alkaline water electrolysis tank further comprises a rotating electrolyte structure, and the rotating electrolyte structure is arranged at the lower end of the cylindrical tank body, so that the electrolyte entering anode liquid inlets and cathode liquid inlets is in a rotating state. Vortices are generated at the cathode liquid inlets and the anode liquid inlets, the diffusion process of hydrogen is enhanced at the inlets, the activation sites on the cathode surface are increased, and the cathode activation overpotential caused by bubbles is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings constituting a part of the application serve to provide a further understanding of the application, and the schematic embodiments of the application and the description thereof serve to explain the application and do not constitute an improper limitation on the application. In the drawings:

[0029] Figure 1 is a structural schematic view of the internally embedded spiral belt cylindrical alkaline water electrolysis tank provided by the specific embodiment of the application;

[0030] Figure 2 is a partial structural schematic view of the internally embedded spiral belt cylindrical alkaline water electrolysis tank provided by the specific embodiment of the application;

[0031] Figure 3 is a structural schematic view of the spiral belt structure of the internally embedded spiral belt cylindrical alkaline water electrolysis tank provided by the specific embodiment of the application;

[0032] Figure 4 is a side view of a cylindrical alkaline water electrolyzer with embedded spiral strips provided by specific embodiments of the present application;

[0033] Figure 5 is a top view of a cylindrical alkaline water electrolyzer with embedded spiral strips provided by specific embodiments of the present application;

[0034] Figure 6 is the outlet flow velocity distribution diagram of four electrolyzer models;

[0035] Figure 7 is the flow velocity streamline distribution diagram of four electrolyzer models.

[0036] In the figure:

[0037] 1, cathode electrode; 2, diaphragm; 3, anode electrode; 4, cathode spiral strip; 5, anode spiral strip; 6, cathode gas-liquid outlet; 7, anode gas-liquid outlet; 8, anode liquid inlet; 9, cathode liquid inlet. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0039] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary 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 explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of the present embodiment, the terms "upper", "lower", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0042] Referring to Figures 1-7 To illustrate the present embodiment, the present application provides a cylindrical alkaline water electrolyzer internally embedded with a spiral strip, which comprises a cylindrical tank body, a diaphragm 2, an anode electrode 3, a cathode electrode 1 and a spiral strip structure. The lower part of the cylindrical tank body is provided with an anode liquid inlet 8 and a cathode liquid inlet 9, and the upper part of the cylindrical tank body is provided with an anode gas-liquid outlet 7 and a cathode gas-liquid outlet 6. The diaphragm 2 is fixedly arranged in the cylindrical tank body, and the diaphragm 2 divides the space in the cylindrical tank body into a cathode chamber and an anode chamber. The anode chamber is closer to the center of the cylindrical tank body relative to the cathode chamber. The upper end and the lower end of the cathode chamber are respectively communicated with the cathode gas-liquid outlet 6 and the cathode liquid inlet 9, and the upper end and the lower end of the anode chamber are respectively communicated with the anode gas-liquid outlet 7 and the anode liquid inlet 8. The anode electrode 3 is located in the anode chamber, and the cathode electrode 1 is located in the cathode chamber. The spiral strip structure comprises a cathode spiral strip 4 and an anode spiral strip 5. The two sides of the anode spiral strip 5 are respectively in contact with the anode electrode 3 and the diaphragm 2, and the two sides of the cathode spiral strip 4 are respectively in contact with the cathode electrode 1 and the diaphragm 2. The cathode spiral strip 4 spirally extends around the outer surface of the diaphragm 2, and the anode spiral strip 5 spirally extends around the outer surface of the anode electrode 3.

[0043] The cylindrical alkaline water electrolyzer with internal embedded spiral belts, electrolyte enters the cathode chamber from the cathode liquid inlet 9, and is discharged from the cathode gas-liquid outlet 6 after reaction, at the same time, the cathode gas-liquid outlet 6 serves as a gas discharge port, electrolyte enters the anode chamber from the anode liquid inlet 8, and is discharged from the anode gas-liquid outlet 7 after reaction, at the same time, the anode gas-liquid outlet 7 serves as a gas discharge port. The cathode spiral belt 4 can generate stable and uniform longitudinal vortex flow in the cathode chamber, and the anode spiral belt 5 can generate stable and uniform longitudinal vortex flow in the anode chamber. The electrolyte starts to rotate from the cathode liquid inlet 9 and the anode liquid inlet 8, and then cooperates with the cathode spiral belt 4 and the anode spiral belt 5, so that the electrolyte and gas flow along the extension direction of the cathode spiral belt 4 and the anode spiral belt 5, and the rotation of the electrolyte washes the cathode electrode 1 and the anode electrode 3, which can effectively reduce the gas coverage rate on the surface of the cathode electrode 1 and the anode electrode 3, is conducive to the diffusion of gas, thereby improving the problem of gas accumulation on the surface of the cathode electrode 1 and the anode electrode 3 in the alkaline water electrolyzer. Because the cathode chamber and the anode chamber are provided with the same flow rate, but the cross-sectional area of the cathode chamber is larger, therefore, the flow rate of the electrolyte in the anode chamber is higher, and the electrolyte tends to impact the anode electrode 3, so that the oxygen generated by the anode electrode 3 is carried away by the electrolyte. In the cathode chamber, the electrolyte spirally rises, and due to the action of centrifugal force, the flow rate of the electrolyte on the outside is higher than that on the inside, the outside is the side close to the cathode electrode 1, and the inside is the side close to the diaphragm 2, the pressure on the outside is higher than that on the inside, thereby promoting the hydrogen generated by the cathode electrode 1 to gradually accumulate on the side with lower pressure, that is, the inside, that is, the side close to the diaphragm 2, away from the cathode electrode 1, so that the hydrogen content on the surface of the cathode electrode 1 is reduced.

[0044] In the cylindrical alkaline water electrolyzer with internal embedded spiral belts, the hydrogen generated by the cathode electrode 1 is carried away from the cathode electrode 1 by the centrifugal force generated by the spiral rising of the electrolyte in the cathode chamber, and moves towards the diaphragm 2, reducing the hydrogen retention on the surface of the cathode electrode 1, and the oxygen generated by the anode electrode 3 is carried away from the anode electrode 3 by the high flow rate of the electrolyte in the anode chamber. It can effectively reduce the gas coverage rate on the surface of the cathode electrode 1 and the anode electrode 3, is conducive to the diffusion of gas, and has smaller flow loss, improves the contact efficiency between the cathode electrode 1, the anode electrode 3 and the electrolyte, and improves the efficiency of electrochemical reaction and energy conversion rate.

[0045] Moreover, the two sides of the anode spiral belt 5 are in contact with the anode electrode 3 and the diaphragm 2 respectively, and the two sides of the cathode spiral belt 4 are in contact with the cathode electrode 1 and the diaphragm 2 respectively, which can ensure the sealing and stability of the structure, thereby achieving the technical effect of not affecting the flow rate.

[0046] Moreover, the cylindrical alkaline water electrolyzer with internal embedded spiral belts does not need to punch the cathode electrode 1 and the anode electrode 3, can replace different cathode electrodes 1 and anode electrodes 3, is simpler to process, and is convenient to maintain, thereby reducing the manufacturing and maintenance costs.

[0047] Optionally, the cylindrical alkaline water electrolyzer with internal embedded spiral belts further comprises a rotating electrolyte structure arranged at the lower end of the cylindrical tank body, which can make the electrolyte entering the anode liquid inlet 8 and the cathode liquid inlet 9 in a rotating state. The vortex can be generated at the cathode liquid inlet 9 and the anode liquid inlet 8, which enhances the diffusion process of hydrogen gas, increases the activation sites on the cathode surface, and reduces the cathode activation overpotential caused by bubbles.

[0048] Optionally, the anode electrode 3, the diaphragm 2 and the cathode electrode 1 are all cylindrical and arranged concentrically.

[0049] Optionally, the upper end and the lower end of the anode spiral belt 5 are flush with the anode gas-liquid outlet 7 and the anode liquid inlet 8 respectively; the upper end and the lower end of the cathode spiral belt 4 are flush with the cathode gas-liquid outlet 6 and the cathode liquid inlet 9 respectively.

[0050] Optionally, the angle between the anode spiral belt 5 and the anode liquid inlet 8 is 30°-60°; the angle between the cathode spiral belt 4 and the cathode liquid inlet 9 is 30°-60°. However, it is not limited to this angle requirement. When designing according to different rotating electrolyte inlet speeds, corresponding reasonable design is needed to make the cathode spiral belt 4 and the anode spiral belt 5 cooperate with the rotating electrolyte to form a suitable rotational flow, so as to achieve the technical effect of not affecting the flow rate.

[0051] Optionally, the number of turns of the anode spiral belt 5 around the anode electrode 3 is 1-4 turns, and the number of turns of the cathode spiral belt 4 around the diaphragm 2 is 1-4 turns. However, it is not limited to this number of turns requirement. When designing according to different types and sizes of electrolyzers, corresponding reasonable design is needed to make the cathode spiral belt 4 and the anode spiral belt 5 cooperate with the cylindrical tank body to form a suitable rotational flow and a reasonable space arrangement, so as to achieve the technical effect of not affecting the flow rate.

[0052] Optionally, the height of the anode spiral belt 5 around the anode electrode 3 is 1000mm-10000mm; the height of the cathode spiral belt 4 around the diaphragm 2 is 1000mm-10000mm. However, it is not limited to this height requirement. When designing according to different types and sizes of electrolyzers, corresponding reasonable design is needed to make the cathode spiral belt 4 and the anode spiral belt 5 cooperate with the cylindrical tank body to form a suitable rotational flow and a reasonable space arrangement, so as to achieve the technical effect of not affecting the flow rate.

[0053] Optionally, the thickness of the cathode spiral strip 4 and the anode spiral strip 5 is 0.2mm-2mm. However, it is not limited to this thickness requirement. According to the design of electrolytic cells of different types and sizes, the corresponding reasonable design is needed to make the cathode spiral strip 4, the anode spiral strip 5 and the cylindrical tank cooperate to form suitable spiral flow and reasonable spatial arrangement, so as to achieve the technical effect of not affecting the flow rate.

[0054] Optionally, the upper end and the lower end of the cylindrical tank are fixedly provided with a polar frame, the cathode spiral strip 4 and the anode spiral strip 5 are fixedly arranged in the polar frame, and the cathode electrode 1 and the anode electrode 3 are detachably arranged in the polar frame. The upper end and the lower end of the cathode spiral strip 4 and the anode spiral strip 5 are welded on the polar frame and only contact with the cathode electrode 1 and the anode electrode 3 to facilitate subsequent installation. The cathode spiral strip 4 and the anode spiral strip 5 are elastically fixed in the electrolytic chamber through the connecting piece. This design can improve the structural strength, does not need to punch the polar plate, is simple to process, and is convenient to install and maintain, thereby reducing the manufacturing and maintenance costs.

[0055] Optionally, the cathode spiral strip 4 is an integral molding structure; and the anode spiral strip 5 is an integral molding structure.

[0056] Optionally, the cylindrical alkaline water electrolytic cell with the embedded spiral strip further comprises a cathode terminal post and an anode terminal post, the cathode terminal post is arranged on the cathode electrode 1, and the anode terminal post is arranged on the anode electrode 3.

[0057] The cathode terminal post is an output port of the current of the cathode electrode 1 to an external power supply, is connected with the pulse voltage generator through a wire to form a current loop; and the anode terminal post is an input port of the current of the electrode to the external power supply, is connected with the pulse voltage generator through a wire to form a current loop. The external power supply inputs the current from the anode electrode 3 through the anode terminal post, the current passes through the alkaline electrolyte, the diaphragm 2, and then passes through the cathode electrode 1 and is output through the cathode terminal post, so that the electrolysis process is carried out, the hydrogen generated in the electrolysis process is discharged from the cathode gas-liquid outlet 6 in the cathode chamber, and the oxygen generated is discharged from the anode gas-liquid outlet 7 in the anode chamber.

[0058] When the cylindrical alkaline water electrolytic cell with the embedded spiral strip is used, a KOH solution with a concentration of 6mol / L is used as the electrolyte, the inlet flow rate of the electrolyte is 0.2kg / s, the working temperature is 70℃, and the electrolyte enters the electrolytic cell through the cathode liquid inlet 9 and the anode liquid inlet 8 respectively. The hydrogen is generated at the cathode electrode 1 and is discharged through the cathode gas-liquid outlet 6, and the oxygen is generated at the anode electrode 3 and is discharged through the anode gas-liquid outlet 7.

[0059] In this embodiment, the specific structural dimensions are: the height of the cathode chamber and the anode chamber is 100 mm, the number of turns of the cathode spiral belt 4 and the anode spiral belt 5 is 2 turns, the width of the cathode spiral belt 4 and the anode spiral belt 5 is 3 mm, the thickness of the cathode spiral belt 4 and the anode spiral belt 5 is 0.5 mm, the radius of the cathode electrode 1 is 10 mm, the radius of the anode electrode 3 is 3 mm, the outer diameter of the diaphragm 2 is 7 mm, the inner diameter of the diaphragm 2 is 6 mm, the thickness of the diaphragm 2 is 1 mm, and the average current density is 3000 A / m 2 .

[0060] In order to study the influence mechanism of spiral belt structure and inlet velocity form on flow field velocity and hydrogen distribution, four different electrolytic cell models are created, which are: (a) the first model, the cathode chamber and the anode chamber are straight channels without spiral belt structure, and there is no rotating electrolyte structure, the electrolyte entering the cathode inlet 9 and the anode inlet 8 has no rotating speed; (b) the second model, the cathode chamber and the anode chamber are straight channels without spiral belt structure, and there is a rotating electrolyte structure, the electrolyte entering the cathode inlet 9 and the anode inlet 8 has a rotating speed, which can generate vortex at the inlet; (c) the third model, the cathode chamber and the anode chamber are provided with spiral belt structure, and there is no rotating electrolyte structure, the electrolyte entering the cathode inlet 9 and the anode inlet 8 has no rotating speed; (d) the fourth model, the cathode chamber and the anode chamber are provided with spiral belt structure, and there is a rotating electrolyte structure, the electrolyte entering the cathode inlet 9 and the anode inlet 8 has a rotating speed, which can generate vortex at the inlet. By solving the multiphase flow model and the electrochemical model in the three-dimensional electrolytic cell model, and numerical simulation analysis of the above four models, the outlet velocity distribution cloud picture and the velocity streamline distribution of the four models are compared and analyzed, and the hydrogen coverage rate on the surface of the electrode of different models is compared.

[0061] Referring to Figure 6 According to the simulation results, it can be clearly observed that the spiral belt structure helps to reduce the hydrogen content on the surface of the cathode electrode 1. The arrows in the cloud picture represent the direction of the continuous phase velocity, from which it can be observed that the electrolyte of the fourth model tends to impact the cathode electrode 1, so that the hydrogen generated by the cathode electrode 1 is more easily carried away by the electrolyte, that is, the effect of reducing the adhesion phenomenon on the surface of the cathode electrode 1 is the best.

[0062] Referring to Figure 7According to the simulation results, it can be clearly observed that the fourth model keeps the best rotating effect inside the flow channel. In the comparison between the first model and the third model, although they both have no rotating electrolyte structure and the inlet velocity is perpendicular to the inlet section, in the third model, due to the existence of the spiral belt structure, the electrolyte at the inlet closest to the spiral belt structure first presents the rotating effect, and when the distance z from the electrolyte tank inlet is 30 mm, the electrolyte is in the rotating state. Compared with the second model and the fourth model, even under the same inlet velocity condition, the streamline of the fourth model still keeps a good vortex angle at the outlet, while the velocity streamline of the second model gradually loses the rotating characteristics. Therefore, the fourth model is more likely to maintain stable rotating characteristics, so that hydrogen gas is separated from the surface of the cathode electrode 1.

[0063] The average value of the volume fraction in the cathode chamber under different models is calculated, which is used as an evaluation index for comparison.

[0064] According to the simulation results, it can be clearly observed that, compared with no spiral belt structure, the hydrogen concentration outside the cathode chamber is gradually decreasing. The hydrogen concentration outside the cathode chamber of the fourth model decreases by 50.85%, greatly reducing the cathode activation overpotential caused by bubbles and improving the dehydrogenation energy efficiency.

[0065] Based on the above analysis, the fourth model with the spiral belt structure and the rotating electrolyte structure is the best, which can effectively reduce the gas on the electrode surface, effectively reduce the adhesion rate of the gas on the electrode surface, and help to improve the hydrogen production efficiency of the electrolysis tank.

[0066] Obviously, the above disclosed embodiments of the application are only used to help explain the application. The embodiments do not describe all the details, nor limit the application to the specific implementation. According to the content of the specification, many modifications and changes can be made. The specification selects and describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. Here, it is not necessary and impossible to exhaust all the embodiments.

Claims

1. A cylindrical alkaline water electrolyzer internally embedded with a spiral ribbon, characterized by, The application relates to a cylindrical electrolytic cell. The cylindrical electrolytic cell comprises: a cylindrical groove, which is provided with an anode liquid inlet (8) and a cathode liquid inlet (9) at the lower end and an anode gas-liquid outlet (7) and a cathode gas-liquid outlet (6) at the upper end; a diaphragm (2) fixedly arranged in the cylindrical groove, which divides the space in the cylindrical groove into a cathode chamber and an anode chamber, the anode chamber being close to the center of the cylindrical groove relative to the cathode chamber, the upper end and the lower end of the cathode chamber being communicated with the cathode gas-liquid outlet (6) and the cathode liquid inlet (9) respectively, and the upper end and the lower end of the anode chamber being communicated with the anode gas-liquid outlet (7) and the anode liquid inlet (8) respectively; an anode electrode (3) arranged in the anode chamber; a cathode electrode (1) arranged in the cathode chamber; a spiral belt structure, which comprises a cathode spiral belt (4) and an anode spiral belt (5), the two sides of the anode spiral belt (5) being in contact with the anode electrode (3) and the diaphragm (2) respectively, the two sides of the cathode spiral belt (4) being in contact with the cathode electrode (1) and the diaphragm (2) respectively, the cathode spiral belt (4) spirally extending around the outer surface of the diaphragm (2), and the anode spiral belt (5) spirally extending around the outer surface of the anode electrode (3); the cathode spiral belt (4) is an integral structure; and the anode spiral belt (5) is an integral structure; 2. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: a rotating electrolyte structure arranged at the lower end of the cylindrical groove, which can make the electrolyte entering the anode liquid inlet (8) and the cathode liquid inlet (9) in a rotating state.

3. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The anode electrode (3), the diaphragm (2) and the cathode electrode (1) are all in a cylindrical shape and arranged concentrically.

4. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The included angle between the anode spiral belt (5) and the anode liquid inlet (8) is 30-60 degrees; and the included angle between the cathode spiral belt (4) and the cathode liquid inlet (9) is 30-60 degrees.

5. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The number of turns of the anode spiral belt (5) around the anode electrode (3) is 1-4 turns; and the number of turns of the cathode spiral belt (4) around the diaphragm (2) is 1-4 turns.

6. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The height of the anode spiral belt (5) around the anode electrode (3) is 1000-10000 mm; and the height of the cathode spiral belt (4) around the diaphragm (2) is 1000-10000 mm.

7. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The thickness of the cathode spiral belt (4) and the anode spiral belt (5) is 0.2-2 mm.

8. The internally embedded spiral band cylindrical alkaline water electrolyzer of claim 1, wherein: The upper end and the lower end of the cylindrical groove are both fixedly provided with a pole frame, the cathode spiral belt (4) and the anode spiral belt (5) are both fixedly arranged in the pole frame, and the cathode electrode (1) and the anode electrode (3) are both detachably arranged in the pole frame. The application further comprises a cathode terminal post and an anode terminal post, the cathode terminal post being arranged on the cathode electrode (1), and the anode terminal post being arranged on the anode electrode (3).

Images