Cylindrical alkaline water electrolytic bath internally embedded with spiral band

Abstract

The invention provides a cylindrical alkaline water electrolytic bath internally embedded with a spiral band, and belongs to the field of electrolysis. The problem that gas is still accumulated on the surfaces of the cathode electrode and the anode electrode of the alkaline water electrolytic bath is solved. In the structure, a space in a cylindrical tank body is divided into a cathode chamber and an anode chamber by a diaphragm, the anode chamber is close 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 a cathode gas-liquid outlet and a cathode liquid inlet, and the upper end and the lower end of the anode chamber are respectively communicated with an anode gas-liquid outlet and an anode liquid inlet; the anode electrode is located in the anode chamber, and the cathode electrode is located in the cathode chamber; the spiral band structure comprises a cathode spiral band and an anode spiral band, the two sides of the anode spiral band are in contact with the anode electrode and the diaphragm respectively, the two sides of the cathode spiral band are in contact with the cathode electrode and the diaphragm respectively, the cathode spiral band spirally extends around the outer surface of the diaphragm, and the anode spiral band spirally extends around the outer surface of the anode electrode. And the gas coverage rate of the electrode surface can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrolysis, and particularly relates to a cylindrical alkaline water electrolyzer with a spiral strip embedded inside. Background Art

[0002] During the process of water electrolysis, hydrogen bubbles and oxygen bubbles formed by electrochemical reactions will become the main source of resistance to water electrolysis. The reason is that these bubbles cover the surfaces of the cathode electrode and the anode electrode, reducing the active area. From a microscopic perspective, the bubbles will isolate the active sites on the cathode electrode and the anode electrode. In addition, the surfaces of these bubbles will cause micro-convection, which will push the electrolyte in one 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 an alkaline water electrolyzer has a dual effect. On the one hand, the spherical convex structure can provide support for the electrode mesh and reduce 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, and these eddy currents contribute to the uniform distribution of the electrolyte. However, the eddy currents may also cause gas entrainment, making it difficult for the gas to be discharged in a timely manner, thus causing gas accumulation on the surfaces of the cathode electrode and the anode electrode. This accumulation will affect the contact efficiency between the electrode and the electrolyte, and further lead to an increase in cell voltage, an increase in energy consumption, and low efficiency of the electrochemical reaction and energy conversion rate.

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

[0005] In view of this, in order to solve the problem that there is still gas accumulation on the surfaces of the cathode electrode and the anode electrode of the alkaline water electrolyzer in the prior art, and this gas accumulation will affect the contact efficiency between the electrode and the electrolyte, and further lead to an increase in cell voltage, an increase in energy consumption, and low efficiency of the electrochemical reaction and energy conversion rate, the present invention proposes a cylindrical alkaline water electrolyzer with a spiral strip embedded inside.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A cylindrical alkaline water electrolyzer with a spiral strip embedded inside, comprising: A cylindrical cell body, an anode liquid inlet and a cathode liquid inlet are provided below the cylindrical cell body, and an anode gas-liquid outlet and a cathode gas-liquid outlet are provided above the cylindrical cell body; A diaphragm is fixedly arranged in a cylindrical groove body. The diaphragm divides the space in the cylindrical groove body into a cathode chamber and an anode chamber. The anode chamber is closer to the center of the cylindrical groove body than the cathode chamber. The upper and lower ends of the cathode chamber are respectively communicated with a cathode gas-liquid outlet and a cathode liquid inlet, and the upper and lower ends of the anode chamber are respectively communicated with an anode gas-liquid outlet and an anode liquid inlet; An anode electrode is located in the anode chamber; A cathode electrode is located in the cathode chamber; A spiral belt structure includes 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, and 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.

[0007] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the anode electrode, the diaphragm and the cathode electrode are all cylindrical and concentrically arranged.

[0008] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the cylindrical alkaline water electrolyzer with an internally embedded spiral belt further includes a rotating electrolyte structure, which is arranged at the lower end of the cylindrical groove body and can make the electrolyte entering the anode liquid inlet and the cathode liquid inlet in a rotating state.

[0009] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the included angle between the anode spiral belt and the anode liquid inlet is 30°-60°; the included angle between the cathode spiral belt and the cathode liquid inlet is 30°-60°.

[0010] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally 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.

[0011] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the height of the anode spiral belt around the anode electrode for one turn is 1000 mm-10000 mm; the height of the cathode spiral belt around the diaphragm for one turn is 1000 mm-10000 mm.

[0012] As a preferred solution of the above-mentioned cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the thicknesses of the cathode spiral belt and the anode spiral belt are both 0.2 mm-2 mm.

[0013] As a preferred embodiment of the cylindrical alkaline water electrolyzer with the internally embedded spiral belt, pole frames are fixedly provided at both the upper end and the lower end of the cylindrical cell body. The cathode spiral belt and the anode spiral belt are both fixedly arranged on the pole frames, and the cathode electrode and the anode electrode are both detachably arranged on the pole frames.

[0014] As a preferred embodiment of the cylindrical alkaline water electrolyzer with the internally embedded spiral belt, the cathode spiral belt is an integrally formed structure; the anode spiral belt is an integrally formed structure.

[0015] As a preferred embodiment of the cylindrical alkaline water electrolyzer with the internally embedded spiral belt, the cylindrical alkaline water electrolyzer with the internally embedded spiral belt further includes a cathode terminal and an anode terminal. The cathode terminal is arranged on the cathode electrode; the anode terminal is arranged on the anode electrode.

[0016] Compared with the prior art, the beneficial effects of the cylindrical alkaline water electrolyzer with the internally embedded spiral belt provided by the present invention are as follows: 1. The present invention provides a cylindrical alkaline water electrolyzer with an internally embedded spiral belt. In this cylindrical alkaline water electrolyzer with an internally embedded spiral belt, the electrolyte enters the cathode chamber from the cathode liquid inlet, and after the reaction, it discharges from the cathode gas-liquid outlet. At the same time, the cathode gas-liquid outlet serves as a gas discharge port. The electrolyte enters the anode chamber from the anode liquid inlet, and after the reaction, it discharges from the anode gas-liquid outlet. At the same time, the anode gas-liquid outlet serves as a gas discharge port. The cathode spiral belt can make a stable and uniform longitudinal vortex flow generated in the cathode chamber, and the anode spiral belt can make a stable and uniform longitudinal vortex flow generated in the anode chamber. The electrolyte starts to rotate when it enters the cathode liquid inlet and the anode liquid inlet. Then, in cooperation with the cathode spiral belt and the anode spiral belt, it can make the electrolyte and the gas flow along the extension direction of the cathode spiral belt and the anode spiral belt, and the rotating electrolyte flushes the cathode electrode and the anode electrode, which can effectively reduce the gas coverage rate on the surfaces of the cathode electrode and the anode electrode, is beneficial to the diffusion of the gas, and thus improves the problem of gas accumulation on the surfaces of the cathode electrode and the anode electrode in the alkaline water electrolyzer. Since the same flow rate is set in the cathode chamber and the anode chamber, but the cross-sectional area of the cathode chamber is larger, the velocity of the electrolyte in the anode chamber is higher, and the electrolyte is more inclined 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. Due to the action of centrifugal force, the flow velocity of the outer electrolyte is higher than that of the inner electrolyte. The outer side is the side close to the cathode electrode, and the inner side is the side close to the diaphragm. The pressure on the outer side is higher than that on the inner side, which further promotes the hydrogen generated by the cathode electrode to gradually accumulate on the side with lower pressure, that is, the inner side, which is close to the diaphragm and far from the cathode electrode, so that the hydrogen content on the surface of the cathode electrode is reduced.

[0017] In the cylindrical alkaline water electrolyzer with internally embedded spiral bands, the hydrogen gas generated by the cathode electrode is driven away from the cathode electrode by the centrifugal force generated as it spirally ascends through the electrolyte in the cathode chamber, approaches the diaphragm, reduces the hydrogen gas retention on the surface of the cathode electrode, and the oxygen gas generated by the anode electrode is carried away from the anode electrode due to the high flow rate of the electrolyte in the anode chamber. It can effectively reduce the gas coverage rate on the surfaces of the cathode electrode and the anode electrode, is conducive to gas diffusion, has smaller flow losses, 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.

[0018] 2. The present invention provides a cylindrical alkaline water electrolyzer with internally embedded spiral bands. In this cylindrical alkaline water electrolyzer with internally embedded spiral bands, both sides of the anode spiral band are respectively in contact with the anode electrode and the diaphragm, and both sides of the cathode spiral band are respectively in contact with the cathode electrode and the diaphragm, which can ensure the sealing and stability of the structure, thus achieving the technical effect of not affecting the flow rate.

[0019] Moreover, for this cylindrical alkaline water electrolyzer with internally embedded spiral bands, there is no need to stamp the cathode electrode and the anode electrode, different cathode electrodes and anode electrodes can be replaced, the processing is simpler, the maintenance is convenient, and the manufacturing and maintenance costs are reduced.

[0020] 3. The present invention provides a cylindrical alkaline water electrolyzer with internally embedded spiral bands. This cylindrical alkaline water electrolyzer with internally embedded spiral bands further includes a rotating electrolyte structure, which is arranged at the lower end of the cylindrical tank body and can make the electrolyte entering the anode liquid inlet and the cathode liquid inlet in a rotating state. It can generate vortices at the cathode liquid inlet and the anode liquid inlet. Generating vortices at the inlet enhances the diffusion process of hydrogen gas, increases the activation sites on the cathode surface, and reduces the cathode activation overpotential caused by bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of a cylindrical alkaline water electrolyzer with internally embedded spiral bands provided by a specific embodiment of the present invention; Figure 2 is a partial schematic structural diagram of a cylindrical alkaline water electrolyzer with internally embedded spiral bands provided by a specific embodiment of the present invention; Figure 3 is a schematic structural diagram of the spiral band structure of a cylindrical alkaline water electrolyzer with internally embedded spiral bands provided by a specific embodiment of the present invention; Figure 4It is a side view of a cylindrical alkaline water electrolyzer with a spiral band embedded inside provided by a specific embodiment of the present invention; Figure 5 It is a top view of a cylindrical alkaline water electrolyzer with a spiral band embedded inside provided by a specific embodiment of the present invention; Figure 6 It is the outlet flow velocity distribution diagram of four electrolyzer models; Figure 7 It is the flow velocity streamline distribution diagram of four electrolyzer models.

[0022] In the figure: 1. Cathode electrode; 2. Diaphragm; 3. Anode electrode; 4. Cathode spiral band; 5. Anode spiral band; 6. Cathode gas-liquid outlet; 7. Anode gas-liquid outlet; 8. Anode liquid inlet; 9. Cathode liquid inlet. Specific embodiments Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0025] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0026] Referring to Figure 1-7 To illustrate this embodiment, the present invention provides a cylindrical alkaline water electrolyzer with a spiral belt embedded therein. The cylindrical alkaline water electrolyzer with a spiral belt embedded therein includes a cylindrical tank body, a diaphragm 2, an anode electrode 3, a cathode electrode 1, and a spiral belt structure. An anode liquid inlet 8 and a cathode liquid inlet 9 are provided below the cylindrical tank body, and an anode gas-liquid outlet 7 and a cathode gas-liquid outlet 6 are provided above the cylindrical tank body. 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 than the cathode chamber. The upper and lower ends of the cathode chamber are respectively communicated with the cathode gas-liquid outlet 6 and the cathode liquid inlet 9, and the upper and lower ends 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 belt structure includes a cathode spiral belt 4 and an anode spiral belt 5. The two sides of the anode spiral belt 5 are respectively in contact with the anode electrode 3 and the diaphragm 2, and the two sides of the cathode spiral belt 4 are respectively in contact with the cathode electrode 1 and the diaphragm 2. The cathode spiral belt 4 spirally extends around the outer surface of the diaphragm 2, and the anode spiral belt 5 spirally extends around the outer surface of the anode electrode 3.

[0027] In the cylindrical alkaline water electrolyzer with internally embedded spiral bands, the electrolyte enters the cathode chamber through the cathode liquid inlet 9, and after the reaction, it is discharged from the cathode gas-liquid outlet 6. At the same time, the cathode gas-liquid outlet 6 serves as a gas discharge port. The electrolyte enters the anode chamber through the anode liquid inlet 8, and after the reaction, it is discharged from the anode gas-liquid outlet 7. At the same time, the anode gas-liquid outlet 7 serves as a gas discharge port. The cathode spiral band 4 can generate a stable and uniform longitudinal swirling flow in the cathode chamber, and the anode spiral band 5 can generate a stable and uniform longitudinal swirling flow in the anode chamber. The electrolyte starts to rotate when it enters the cathode liquid inlet 9 and the anode liquid inlet 8. Together with the cathode spiral band 4 and the anode spiral band 5, it can make the electrolyte and gas flow along the extension directions of the cathode spiral band 4 and the anode spiral band 5, and through the rotation of the electrolyte to wash the cathode electrode 1 and the anode electrode 3, it can effectively reduce the gas coverage rate on the surfaces of the cathode electrode 1 and the anode electrode 3, which is beneficial to gas diffusion, thus improving the problem of gas accumulation on the surfaces of the cathode electrode 1 and the anode electrode 3 in the alkaline water electrolyzer. Since the cathode chamber and the anode chamber are set with the same flow rate, but the cross-sectional area of the cathode chamber is larger, the velocity of the electrolyte in the anode chamber is higher, and the electrolyte is more inclined 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 spirals upward. Due to the action of centrifugal force, the flow velocity of the outer electrolyte is higher than that of the inner electrolyte. The outer side is the side close to the cathode electrode 1, and the inner side is the side close to the diaphragm 2. The pressure on the outer side is higher than that on the inner side, which further promotes the hydrogen generated by the cathode electrode 1 to gradually accumulate on the side with lower pressure, that is, the inner side, which is the side close to the diaphragm 2 and far from the cathode electrode 1, resulting in a decrease in the hydrogen content on the surface of the cathode electrode 1.

[0028] In the cylindrical alkaline water electrolyzer with internally embedded spiral bands, the hydrogen generated by the cathode electrode 1 is carried away from the cathode electrode 1 by the centrifugal force generated by the spiral upward movement of the electrolyte in the cathode chamber and approaches the diaphragm 2, reducing the hydrogen retention on the surface of the cathode electrode 1. The oxygen generated by the anode electrode 3 is carried away from the anode electrode 3 due to the high flow velocity of the electrolyte in the anode chamber. It can effectively reduce the gas coverage rate on the surfaces of the cathode electrode 1 and the anode electrode 3, which is beneficial to gas diffusion, and has smaller flow losses, improving the contact efficiency between the cathode electrode 1, the anode electrode 3 and the electrolyte, and improving the efficiency of the electrochemical reaction and the energy conversion rate.

[0029] Moreover, both sides of the anode spiral band 5 are in contact with the anode electrode 3 and the diaphragm 2 respectively, and both sides of the cathode spiral band 4 are in contact with the cathode electrode 1 and the diaphragm 2 respectively, which can ensure the sealing and stability of the structure, thus achieving the technical effect of not affecting the flow rate.

[0030] Furthermore, for the cylindrical alkaline water electrolyzer with internally embedded spiral bands, there is no need to punch the cathode electrode 1 and the anode electrode 3. Different cathode electrodes 1 and anode electrodes 3 can be replaced, the processing is simpler, and the maintenance is convenient, reducing the manufacturing and maintenance costs.

[0031] Optionally, the cylindrical alkaline water electrolyzer with the internally embedded spiral belt further includes a rotating electrolyte structure disposed at the lower end of the cylindrical cell body, which can make the electrolyte entering the anode liquid inlet 8 and the cathode liquid inlet 9 in a rotating state. It can generate vortices at the cathode liquid inlet 9 and the anode liquid inlet 8. Generating vortices at the inlet enhances the diffusion process of hydrogen, increases the activation sites on the cathode surface, and reduces the cathode activation overpotential caused by bubbles.

[0032] Optionally, the anode electrode 3, the diaphragm 2, and the cathode electrode 1 are all cylindrical and concentrically arranged.

[0033] Optionally, the upper and lower ends of the anode spiral belt 5 are flush with the anode gas-liquid outlet 7 and the anode liquid inlet 8 respectively; the upper and lower ends of the cathode spiral belt 4 are flush with the cathode gas-liquid outlet 6 and the cathode liquid inlet 9 respectively.

[0034] Optionally, the included angle between the anode spiral belt 5 and the anode liquid inlet 8 is 30° - 60°; the included 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 rotational electrolyte inlet velocities, corresponding reasonable designs are needed to make the cathode spiral belt 4, the anode spiral belt 5, and the rotating electrolyte cooperate to form a suitable swirl flow, so as to achieve the technical effect of not affecting the flow rate.

[0035] 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 designs are needed to make the cathode spiral belt 4, the anode spiral belt 5, and the cylindrical cell body cooperate to form a suitable swirl flow and a reasonable spatial arrangement, so as to achieve the technical effect of not affecting the flow rate.

[0036] Optionally, the height of the anode spiral belt 5 around the anode electrode 3 for one turn is 1000 mm - 10000 mm; the height of the cathode spiral belt 4 around the diaphragm 2 for one turn is 1000 mm - 10000 mm. However, it is not limited to this height requirement for one turn. When designing according to different types and sizes of electrolyzers, corresponding reasonable designs are needed to make the cathode spiral belt 4, the anode spiral belt 5, and the cylindrical cell body cooperate to form a suitable swirl flow and a reasonable spatial arrangement, so as to achieve the technical effect of not affecting the flow rate.

[0037] Optionally, the thicknesses of both the cathode spiral belt 4 and the anode spiral belt 5 are 0.2 mm to 2 mm. However, this thickness requirement is not limited. When designing according to different types and sizes of electrolytic cells, corresponding reasonable designs are needed to enable the cathode spiral belt 4, the anode spiral belt 5 and the cylindrical cell body to cooperate to form appropriate swirling flows and reasonable spatial arrangements, so as to achieve the technical effect of not affecting the flow rate.

[0038] Optionally, pole frames are fixedly provided at both the upper and lower ends of the cylindrical cell body. The cathode spiral belt 4 and the anode spiral belt 5 are both fixedly arranged on the pole frames, and the cathode electrode 1 and the anode electrode 3 are both detachably arranged on the pole frames. The upper and lower ends of the cathode spiral belt 4 and the anode spiral belt 5 are welded to the pole frames and only contact the cathode electrode 1 and the anode electrode 3 to facilitate subsequent installation. The cathode spiral belt 4 and the anode spiral belt 5 are elastically fixedly connected in the electrolysis chamber through connecting pieces. This design can improve the structural strength, eliminate the need for stamping electrode plates, is simple to process, and is convenient for installation and maintenance, thereby reducing the manufacturing and maintenance costs.

[0039] Optionally, the cathode spiral belt 4 is of an integrally formed structure; the anode spiral belt 5 is of an integrally formed structure.

[0040] Optionally, the cylindrical alkaline water electrolysis cell with an internally embedded spiral belt further includes a cathode terminal and an anode terminal. The cathode terminal is arranged on the cathode electrode 1; the anode terminal is arranged on the anode electrode 3.

[0041] The cathode terminal is the current output port of the external power supply for the cathode electrode 1 and is connected to the pulse voltage generator through a wire to form a current loop; the anode terminal is the current input port of the external power supply for the electrode and is connected to the pulse voltage generator through a wire to form a current loop. The external power supply inputs current from the anode electrode 3 through the anode terminal. The current passes through the alkaline electrolyte and the diaphragm 2, and then passes through the cathode electrode 1 and is output through the cathode terminal to carry out the electrolysis process. The hydrogen generated during the electrolysis process is discharged from the cathode gas-liquid outlet 6 through the cathode chamber, and the oxygen generated is discharged from the anode gas-liquid outlet 7 through the anode chamber.

[0042] When using the cylindrical alkaline water electrolysis cell with an internally embedded spiral belt, a KOH solution with a concentration of 6 mol / L is used as the electrolyte. The inlet flow rate of the electrolyte is 0.2 kg / s, the working temperature is 70 °C, and the electrolyte enters the electrolysis cell through the cathode liquid inlet 9 and the anode liquid inlet 8 respectively. Hydrogen is generated at the cathode electrode 1 and discharged through the cathode gas-liquid outlet 6, and oxygen is generated at the anode electrode 3 and discharged through the anode gas-liquid outlet 7.

[0043] In this embodiment, the specific structural dimensions are as follows: the height of the cathode chamber and the anode chamber is 100 mm, the number of turns of the cathode spiral strip 4 and the anode spiral strip 5 is 2 turns, the width of the cathode spiral strip 4 and the anode spiral strip 5 is 3 mm, the thickness of the cathode spiral strip 4 and the anode spiral strip 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 .

[0044] In order to study the influence mechanism of the spiral strip structure and the inlet velocity form on the flow field velocity and hydrogen distribution. Four different electrolytic cell models were created, namely: (a) The first model, the cathode chamber and the anode chamber are straight channels without spiral strip structure and without rotating electrolyte structure, and the electrolytes entering the cathode inlet 9 and the anode inlet 8 have no rotational velocity; (b) The second model, the cathode chamber and the anode chamber are straight channels without spiral strip structure and are provided with a rotating electrolyte structure, and the electrolytes entering the cathode inlet 9 and the anode inlet 8 have rotational velocity, and vortices can be generated at the inlet; (c) The third model, the cathode chamber and the anode chamber are provided with spiral strip structure and without rotating electrolyte structure, and the electrolytes entering the cathode inlet 9 and the anode inlet 8 have no rotational velocity; (d) The fourth model, the cathode chamber and the anode chamber are provided with spiral strip structure and are provided with a rotating electrolyte structure, and the electrolytes entering the cathode inlet 9 and the anode inlet 8 have rotational velocity, and vortices can be generated at the inlet. By solving the multiphase flow model and the electrochemical model in the three-dimensional electrolytic cell model, and through the numerical simulation analysis of the above four models, the outlet velocity distribution cloud diagram and the velocity streamline distribution of the four models are compared and analyzed, and the hydrogen coverage rate on the electrode surface of different models is compared.

[0045] Referring to Figure 6 , according to the simulation results, it can be clearly observed that the presence of the spiral strip structure helps to reduce the hydrogen content on the surface of the cathode electrode 1. The arrows in the cloud diagram represent the direction of the continuous phase velocity. It can be observed from this that the electrolyte of the fourth model is more inclined 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.

[0046] Referring to Figure 7, According to the simulation results, it can be clearly observed that the fourth model maintains the best rotation effect inside the flow channel. In the comparison between the first model and the third model, although neither of them has a rotating electrolyte structure and their inlet velocities are perpendicular to the inlet cross-section, in the third model, due to the presence of the spiral band structure, the electrolyte at the inlet closest to the spiral band structure first shows a rotating effect, and all the electrolyte is in a rotating state when the distance from the electrolytic cell inlet z = 30 mm; compared with the second model and the fourth model, even under the same inlet velocity conditions, the streamline of the fourth model still maintains a good vortex angle at the outlet, while the velocity streamline of the second model gradually loses its rotating characteristics. Therefore, the fourth model is more likely to maintain a stable rotating characteristic, enabling hydrogen to detach from the surface of the cathode electrode 1.

[0047] Calculate the average value of the volume fractions inside and outside the cathode chamber under different models, and use this as an evaluation index for comparison.

[0048] According to the simulation results, it can be clearly observed that compared with the absence of the spiral band structure, the hydrogen concentration outside the cathode chamber is gradually decreasing. The hydrogen concentration outside the cathode chamber of the fourth model has decreased by 50.85%, greatly reducing the cathode activation overpotential caused by bubbles and improving the dehydrogenation energy efficiency.

[0049] In summary, the fourth model with a spiral band structure and a rotating electrolyte structure has the best effect, can effectively reduce the gas on the electrode surface, can effectively reduce the gas adhesion rate on the electrode surface, and helps to improve the hydrogen production efficiency of the electrolytic cell.

[0050] Obviously, the embodiments of the present invention disclosed above are only used to help explain the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. It is not necessary and impossible to enumerate all the embodiments here.

Claims

1. A cylindrical alkaline water electrolyzer with a spiral ribbon embedded inside, characterized in that, Comprising: A cylindrical tank body, with an anodic liquid inlet (8) and a cathodic liquid inlet (9) provided below the cylindrical tank body, and an anodic gas-liquid outlet (7) and a cathodic gas-liquid outlet (6) provided above the cylindrical tank body; A diaphragm (2), the diaphragm (2) is fixedly arranged in the cylindrical tank body, the diaphragm (2) divides the space in the cylindrical tank body into a cathodic chamber and an anodic chamber, the anodic chamber is closer to the center of the cylindrical tank body than the cathodic chamber, the upper and lower ends of the cathodic chamber are respectively communicated with the cathodic gas-liquid outlet (6) and the cathodic liquid inlet (9), and the upper and lower ends of the anodic chamber are respectively communicated with the anodic gas-liquid outlet (7) and the anodic liquid inlet (8); An anodic electrode (3), the anodic electrode (3) is located in the anodic chamber; A cathodic electrode (1), the cathodic electrode (1) is located in the cathodic chamber; A spiral band structure, including a cathodic spiral band (4) and an anodic spiral band (5), both sides of the anodic spiral band (5) are respectively in contact with the anodic electrode (3) and the diaphragm (2), both sides of the cathodic spiral band (4) are respectively in contact with the cathodic electrode (1) and the diaphragm (2), the cathodic spiral band (4) spirally extends around the outer surface of the diaphragm (2), and the anodic spiral band (5) spirally extends around the outer surface of the anodic electrode (3).

2. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, wherein: The anodic electrode (3), the diaphragm (2) and the cathodic electrode (1) are all cylindrical and are concentrically arranged.

3. The cylindrical alkaline water electrolyzer with an internally embedded spiral belt according to claim 1, characterized in that: It further includes a rotating electrolyte structure, the rotating electrolyte structure is arranged at the lower end of the cylindrical tank body and can make the electrolyte entering the anodic liquid inlet (8) and the cathodic liquid inlet (9) in a rotating state.

4. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, characterized in that: The included angle between the anodic spiral band (5) and the anodic liquid inlet (8) is 30° - 60°; the included angle between the cathodic spiral band (4) and the cathodic liquid inlet (9) is 30° - 60°.

5. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, characterized in that: The number of turns of the anodic spiral band (5) around the anodic electrode (3) is 1 - 4 turns, and the number of turns of the cathodic spiral band (4) around the diaphragm (2) is 1 - 4 turns.

6. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, characterized in that: The height of the anodic spiral band (5) around the anodic electrode (3) for one turn is 1000 mm - 10000 mm; the height of the cathodic spiral band (4) around the diaphragm (2) for one turn is 1000 mm - 10000 mm.

7. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, wherein: The thicknesses of the cathodic spiral band (4) and the anodic spiral band (5) are both 0.2 mm - 2 mm.

8. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, characterized in that: Both the upper and lower ends of the cylindrical tank body are fixedly provided with electrode frames, the cathodic spiral band (4) and the anodic spiral band (5) are both fixedly arranged on the electrode frames, and the cathodic electrode (1) and the anodic electrode (3) are both detachably arranged on the electrode frames.

9. The cylindrical alkaline water electrolyzer with an internally embedded spiral belt according to claim 1, characterized in that: The cathodic spiral band (4) is an integrally formed structure; the anodic spiral band (5) is an integrally formed structure.

10. The cylindrical alkaline water electrolyzer with an internally embedded spiral ribbon according to claim 1, characterized in that: It further includes a cathodic terminal and an anodic terminal, the cathodic terminal is arranged on the cathodic electrode (1); the anodic terminal is arranged on the anodic electrode (3).

Images