Gas-liquid separation device for hydrogen production by alkaline electrolysis of water

Abstract

The gas-liquid separation device comprises a tank body, a liquid inlet pipe and a liquid discharge pipe are arranged on the tank body, a heating gas-gathering chamber is arranged in the tank body, the liquid inlet pipe is connected with the heating gas-gathering chamber, a heating gas-gathering element is arranged in the heating gas-gathering chamber, and the liquid discharge pipe is connected with the heating gas-gathering element. The heating and gas gathering element comprises a heating pipe and a gas gathering fiber layer which are sequentially arranged in an overlapped mode, the heating and gas gathering element is used for heating alkali liquor entering from the liquid inlet pipe and gathering tiny bubbles in the alkali liquor, a liquid outlet is formed in the heating and gas gathering chamber, and the liquid outlet and the liquid inlet pipe are located on the two sides of the heating and gas gathering element respectively; an exhaust port is formed in the upper end of the tank body, a liquid recovery element is arranged at the exhaust port, and an exhaust liquid return hole is formed in the liquid recovery element; according to the gas-liquid separation device, tiny bubbles in alkali liquor can be gathered, and the gas-liquid separation efficiency and the gas-liquid separation effect are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by water electrolysis, and in particular to a gas-liquid separation device for hydrogen production by alkaline water electrolysis. Background Art

[0002] As global demand for clean energy continues to grow, hydrogen production technology, as a clean and efficient energy carrier, has attracted widespread attention. Alkaline water electrolysis is a mature hydrogen production technology, but during the production process, the generated hydrogen and oxygen need to be effectively separated from the electrolyte to improve hydrogen purity and yield. This separation requires the use of a gas-liquid separation device.

[0003] The utility model patent with patent number CN202320919552.7 discloses a gas-liquid separation device and a water electrolysis hydrogen production system. The gas-liquid separation device includes a separation container and an inlet pipe. The separation container defines a separation chamber. The lower part of the separation container is provided with an alkali liquid outlet, and the upper part of the separation container is provided with a gas outlet. The inlet pipe penetrates the side wall of the separation container, and the inner section of the inlet pipe located in the separation chamber is arranged obliquely downward. The end face of the inner section is spaced apart from the side wall of the separation container. The inlet pipe is used to introduce a gas-liquid mixed fluid. By arranging the inner end of the inlet pipe obliquely downward, the gas-liquid mixed fluid enters the separation chamber and is subjected to an axial rotational speed and a vertical downward acceleration under the action of inertia and centrifugal force. The different densities of gas and liquid accelerate the separation. The end face of the inner section is spaced apart from the side wall of the separation container. When the gas-liquid mixed fluid enters the separation chamber, it collides with the side wall of the separation container, and the liquid adheres to the side wall of the separation container, thereby improving the gas-liquid separation efficiency and separation effect.

[0004] The above patent provides a gas-liquid separation device that improves the gas-liquid separation efficiency and separation effect to a certain extent compared with the traditional gas-liquid separation device, but it cannot gather the tiny bubbles in the alkali solution, so that the tiny bubbles in the alkali solution will flow out of the gas-liquid separation device along with the alkali solution. Therefore, its gas-liquid separation efficiency needs to be further improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas-liquid separation device for producing hydrogen by alkaline water electrolysis, aiming to improve the problem that the existing gas-liquid separation device cannot gather tiny bubbles in the alkaline solution, so that the tiny bubbles in the alkaline solution flow out of the gas-liquid separation device along with the alkaline solution.

[0006] The present invention is achieved in that:

[0007] A gas-liquid separation device for producing hydrogen by alkaline water electrolysis comprises a tank body, the tank body being provided with a liquid inlet pipe and a liquid discharge pipe, the tank body being provided with a heating gas gathering chamber, the liquid inlet pipe being connected to the heating gas gathering chamber, the heating gas gathering chamber being provided with a heating gas gathering element, the heating gas gathering element being used to heat the alkaline solution entering through the liquid inlet pipe and to gather tiny bubbles in the alkaline solution, the heating gas gathering chamber being provided with a liquid discharge port, the liquid discharge port and the liquid inlet pipe being respectively located on both sides of the heating gas gathering element; an exhaust port being provided at the upper end of the tank body, a liquid recovery element being provided at the exhaust port, and an exhaust and liquid return hole being provided on the liquid recovery element.

[0008] Preferably, the heating and gas gathering element includes a heating tube and a gas gathering fiber layer that are arranged in an overlapping manner. The heating tube has a multiple S-shaped structure, including a straight tube portion and an arc-shaped bent tube portion connecting adjacent straight tube portions. There are multiple heating tubes arranged along the overlapping direction, and the straight tube portions of adjacent heating tubes are perpendicular to each other; the two ends of the heating tube are respectively connected to a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe both pass through the tank wall of the tank body and are connected to the hot liquid supply device.

[0009] Preferably, the gas gathering fiber layer includes a rectangular frame, a fiber mesh layer, a front hard material mesh layer and a rear hard material mesh layer, and the fiber mesh layer, the front hard material mesh layer and the rear hard material mesh layer are all arranged in the rectangular frame, the fiber mesh layer is located between the front hard material mesh layer and the rear hard material mesh layer, the front hard material mesh layer is composed of a plurality of mutually parallel first baffles, and the rear hard material mesh layer is composed of a plurality of mutually parallel second baffles, the first baffle is perpendicular to the second baffle, and the first baffle is perpendicular to the straight tube portion of the heating tube on its front side.

[0010] Preferably, a first partition is provided in the tank body, and the liquid inlet pipe and the liquid discharge pipe are respectively located on both sides of the first partition, the side of the first partition close to the liquid inlet pipe is the liquid inlet cavity, and the side of the first partition close to the liquid discharge pipe is the liquid discharge cavity, the heating and gas gathering chamber is located in the liquid inlet cavity, and the alkaline liquid discharged from its liquid discharge port all enters the liquid inlet cavity; a connecting hole connecting the liquid inlet cavity and the liquid discharge cavity is provided at the bottom of the first partition, and a plurality of ultrasonic rods are provided in the liquid inlet cavity.

[0011] Preferably, a second partition is provided in the drainage chamber, the second partition is parallel to the first partition, the second partition divides the drainage chamber into a first drainage chamber and a second drainage chamber, the first drainage chamber is located between the first partition and the second partition, and a first gas gathering fiber stacking mesh layer is provided in the first drainage chamber; the drainage pipe is L-shaped, including a horizontal pipe portion and a vertical pipe portion, and its horizontal pipe portion is located at the upper end of its vertical pipe portion, the vertical pipe portion of the drainage pipe is located in the second drainage chamber, and the horizontal pipe portion of the drainage pipe is L-shaped. The vertical pipe portion passes through the tank wall of the tank body, the horizontal pipe portion of the drainage pipe is lower than the upper end of the second partition, and the upper end of the second partition is lower than the upper end of the first partition; a second gas gathering fiber stacking mesh layer is provided in the second drainage chamber, and the vertical pipe portion of the drainage pipe passes through the second gas gathering fiber stacking mesh layer, and the lower end port of the vertical pipe portion of the drainage pipe is located below the second gas gathering fiber stacking mesh layer; a sewage outlet is provided on the bottom wall of the liquid inlet chamber and / or the bottom wall of the first drainage chamber, and a sewage valve is provided at the sewage outlet.

[0012] Preferably, the liquid recovery element includes an outer shell, an inner shell and a bottom shell, the outer shell and the inner shell are both hollow cone-shaped, the upper and lower ends of the outer shell are both open, and the diameter of the upper end of the outer shell is larger than the diameter of the lower end, and the upper end of the outer shell is connected to the exhaust port of the tank body; the diameter of the upper end of the inner shell is smaller than the diameter of the lower end, the upper end of the inner shell is sealed, and the lower end is open, and a plurality of exhaust and liquid return holes are provided on the side wall of the inner shell; the bottom shell is annular, and the lower end of the inner shell and the lower end of the outer shell are connected through the bottom shell.

[0013] Preferably, the exhaust return liquid holes are provided in multiple groups on the side wall of the inner shell, and each group of exhaust return liquid holes is evenly arranged along the circumferential direction of the inner shell; each group of exhaust return liquid holes includes a plurality of exhaust return liquid holes arranged in sequence along the busbar direction of the side wall of the inner shell, and the exhaust return liquid holes are in the shape of inverted water drops; in each group of exhaust return liquid holes, a connecting channel is provided between two adjacent exhaust return liquid holes, and in each group of exhaust return liquid holes, a connecting channel is also provided at the lower end of the lowest exhaust return liquid hole, and the connecting channel extends to the lower end of the inner shell.

[0014] Preferably, the liquid inlet pipe is provided with a flow meter on the tube body outside the tank body, and the flow meter is used to detect the flow rate Q of the alkali liquid entering the tank body from the liquid inlet pipe; the liquid outlet of the discharge pipe is provided with a second thermometer at the outside of the tank body, and the second thermometer is used to detect the temperature T2 of the alkali liquid discharged from the tank body by the discharge pipe; an electric control box is provided on the tank body, and a controller and a third thermometer are provided in the electric control box, and the third thermometer is used to detect the ambient temperature T3. The flow meter, the second thermometer and the third thermometer are all electrically connected to the controller, and the controller has a control module, a calculation module and a storage module. The storage module stores the process temperature T0 of the alkali liquid during electrolysis of the alkali liquid in the electrolytic cell, then T0=T2-T4, wherein T4 is the temperature of the alkali liquid refluxed from the discharge pipe The dissipation temperature is lowered due to heat loss when reaching the electrolytic cell, T4=f(Q, T2, T3), and the calculation module calculates the required discharge temperature T20 of the tank body through the formula T2=T0+f(Q, T2, T3); the heating pipe is connected to a hot liquid supply device, and the hot liquid supply device has an electric heating module. If T20>T2, and (T20-T2) / T2≥N%, where 2≤N≤5, the control module of the controller transmits a heating signal to the hot liquid supply device, and the hot liquid supply device controls to increase the power of the electric heating module. If T20<T2, and (T2-T20) / T2≥M%, where 2≤M≤5, the control module of the controller transmits a cooling signal to the hot liquid supply device, and the hot liquid supply device controls to stop the electric heating module.

[0015] Preferably, T4=f(Q, T2, T3)=f(T2)×f(Q, T3), where f(T2) can be expressed by Table 1:

[0016] T2 f(T2) T21≤T2<T22 A1 T22≤T2<T23 A2 …… …… T2k≤T2 Ak

[0017] (Table 1)

[0018] f(Q, T3) can be expressed by Table 2:

[0019]

[0020] (Table 2)

[0021] In Table 1 and Table 2, n, m, and k are all integers greater than 1.

[0022] Preferably, a first thermometer is provided on the liquid inlet pipe, and the first thermometer is located on the outside of the tank body. The first thermometer is used to detect the temperature T1 of the alkali liquid entering the tank body through the liquid inlet pipe. The first thermometer is electrically connected to the controller. The heating and gas gathering element has a heating tube, and heating liquid flows through the heating tube. The temperature of the heating liquid is T5. If T0>T1, then T5>T0. If T1≥T0, the control module of the controller sends an alarm signal to the electrolytic cell.

[0023] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a heated gas collection chamber, which is equipped with a heated gas collection element. The heated gas collection element heats the alkali liquid, increasing its temperature and reducing the solubility of gases in the alkali liquid, thereby enhancing gas-liquid separation for the first time. The gas collection fiber layer of the heated gas collection element gathers microbubbles in the alkali liquid, thereby enhancing gas-liquid separation for the second time. An ultrasonic rod gathers microbubbles in the alkali liquid discharged from the heated gas collection chamber into the liquid inlet chamber, thereby enhancing gas-liquid separation for the third time. A first stacked gas collection fiber mesh layer provided in the first drainage chamber gathers microbubbles in the alkali liquid entering the first drainage chamber, thereby enhancing gas-liquid separation for the fourth time. A second stacked gas collection fiber mesh layer in the second drainage chamber gathers microbubbles in the alkali liquid entering the second drainage chamber, thereby enhancing gas-liquid separation for the fifth time. Only after five enhanced gas-liquid separations are achieved will the alkali liquid enter the drainage pipe for discharge. Therefore, the present invention can gather microbubbles in the alkali liquid, effectively improving the efficiency and effectiveness of gas-liquid separation. Other advantages of the present invention are described in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the present invention;

[0025] Figure 2 is a schematic cross-sectional view of the present invention;

[0026] Figure 3 is a top view of the heating and gas gathering element of the present invention;

[0027] Figure 4 This is a top view of the heating gas gathering element of the present invention when the gas gathering fiber layer is removed;

[0028] Figure 5 Schematic diagram of the structure of the gas gathering fiber layer of the heating gas gathering element of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the heating gas gathering element of the present invention when the gas gathering fiber layer is removed from the fiber mesh layer;

[0030] Figure 7 is a three-dimensional schematic diagram of the liquid recovery element of the present invention at an oblique top view;

[0031] Figure 8 is a three-dimensional schematic diagram of the liquid recovery element of the present invention at an oblique upward viewing angle;

[0032] Figure 9 This is a schematic structural diagram of the exhaust and liquid return hole of the liquid recovery element of the present invention;

[0033] Figure 10 It is a block diagram of the electric control structure of the present invention.

[0034] In the figure: 1. tank body; 2. liquid inlet pipe; 3. liquid discharge pipe; 4. heating and gas gathering chamber; 5. heating and gas gathering element; 501. heating pipe; 502. gas gathering fiber layer; 5021. rectangular frame; 5022. fiber mesh layer; 5023. front hard material mesh layer; 5024. rear hard material mesh layer; 6. liquid recovery element; 601. outer shell; 602. inner shell; 603. bottom shell; 604. exhaust and liquid return hole; 6041. arc portion; 6042. V-shaped portion; 605. connecting channel; 7. first partition; 8. second partition; 9. first gas gathering fiber stacking mesh layer; 10. second gas gathering fiber stacking mesh layer; 11. drain valve; 12. flow meter; 13. first thermometer; 14. second thermometer; 15. electric control box; 16. ultrasonic rod. DETAILED DESCRIPTION

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0037] like Figure 1 and Figure 2As shown, a gas-liquid separation device for producing hydrogen by alkaline water electrolysis includes a tank body 1, on which a liquid inlet pipe 2 and a liquid discharge pipe 3 are provided. A first partition plate 7 and a second partition plate 8 are vertically provided in the tank body 1. The liquid inlet pipe 2 and the liquid discharge pipe 3 are respectively located on the left and right sides of the first partition plate 7. The side of the first partition plate 7 close to the liquid inlet pipe 2, that is, the left side of the first partition plate 7, is the liquid inlet chamber, and the side of the first partition plate 7 close to the liquid discharge pipe 3, that is, the right side of the first partition plate 7, is the liquid discharge chamber. The second partition plate 8 is located in the liquid discharge chamber, and the second partition plate 8 is parallel to the first partition plate 7. The second partition plate 8 divides the liquid discharge chamber into a first liquid discharge chamber and a second liquid discharge chamber. The first liquid discharge chamber is located between the first partition plate 7 and the second partition plate 8, that is, the left side of the second partition plate 8 is the first liquid discharge chamber, and the right side of the second partition plate 8 is the second liquid discharge chamber. The drain pipe 3 is L-shaped, including a transverse pipe portion and a vertical pipe portion, and its transverse pipe portion is located at the upper end of its vertical pipe portion, the vertical pipe portion of the drain pipe 3 is located in the second drainage cavity, and the transverse pipe portion of the drain pipe 3 passes through the tank wall of the tank body 1. The transverse pipe portion of the drain pipe 3 is lower than the upper end of the second partition 8, and the upper end of the second partition 8 is lower than the upper end of the first partition 7.

[0038] like Figure 2-Figure 6 As shown, a heating and gas gathering chamber 4 is provided in the liquid inlet cavity, and the liquid inlet pipe 2 is connected to the heating and gas gathering chamber 4. A heating and gas gathering element 5 is provided in the heating and gas gathering chamber 4. The heating and gas gathering element 5 includes heating tubes 501 and gas gathering fiber layers 502 that are arranged in an overlapping manner. The heating tubes 501 have a multiple S-shaped structure, including a straight tube portion and an arc-shaped curved tube portion connecting adjacent straight tube portions. Multiple heating tubes 501 are arranged along the overlapping direction, and the straight tube portions of adjacent heating tubes 501 are perpendicular to each other. This allows each heating tube 501 to contact the alkali solution more evenly, thereby improving heating efficiency. The air-gathering fiber layer 502 includes a rectangular frame 5021, a fiber mesh layer 5022, a front hard material mesh layer 5023 and a rear hard material mesh layer 5024. The fiber mesh layer 5022, the front hard material mesh layer 5023 and the rear hard material mesh layer 5024 are all arranged in the rectangular frame 5021. The fiber mesh layer 5022 is located between the front hard material mesh layer 5023 and the rear hard material mesh layer 5024. The front hard material mesh layer 5023 and the rear hard material mesh layer 5024 are used to protect the fiber mesh layer 5022, which can effectively prevent the fiber mesh layer 5022 from being damaged by water flow. The front hard material mesh layer 5023 is composed of multiple first bars parallel to each other, and the rear hard material mesh layer 5024 is composed of multiple second bars parallel to each other. The first bars are perpendicular to the second bars, and the first bars are perpendicular to the straight tube portion of the heating tube 501 on its front side. The front hard material mesh layer 5023 and the heating tube 501 on its front side form a multiple well-shaped structure. Before the alkali solution impacts the fiber mesh layer 5022, it is blocked and cut by the front hard material mesh layer 5023 and the heating tube 501 on its front side, which can further prevent the fiber mesh layer 5022 from being damaged by water flow.

[0039] The heating tube 501 is connected to a water inlet pipe and a water outlet pipe at both ends. Both the water inlet pipe and the water outlet pipe pass through the tank wall of the tank body 1 and are connected to a hot liquid supply device. The hot liquid supply device includes a delivery pump, a storage box, and an electric heating module. The storage box stores liquid. The electric heating module is an electric heating plate or an electric heating rod, which is used to heat the liquid stored in the storage box. The delivery pump delivers the heated liquid to the heating tube 501, and the liquid discharged from the heating tube 501 returns to the storage box. When hot liquid flows through the heating tube 501, it can heat the alkaline solution in contact with the heating tube 501.

[0040] like Figure 2 As shown, the vertical cross-sectional area of the heating gas gathering chamber 4 is larger than that of the liquid inlet pipe 2. The flow rate remains unchanged, but the cross-sectional area is increased, thereby reducing the cross-sectional flow rate entering the heating gas gathering chamber 4. A liquid discharge port is provided on the heating gas gathering chamber 4. The liquid discharge port and the liquid inlet pipe 2 are respectively located on both sides of the heating gas gathering element 5. The liquid discharge port is provided at the upper end of the side wall of the heating gas gathering chamber 4 or on the top wall of the heating gas gathering chamber 4. In this way, the alkali liquid entering the heating gas gathering chamber 4 through the liquid inlet pipe 2 first fills or nearly fills the heating gas gathering chamber 4 before being discharged from the heating gas gathering chamber 4. This has the following effects: first, the alkali liquid does not directly impact the fiber mesh layer 5022, and the flow rate of the alkali liquid in the heating gas gathering chamber 4 is minimized, so that the impact of the alkali liquid on the fiber mesh layer 5022 is very small, which can effectively prevent the fiber mesh layer 5022 from being damaged by the impact of the water flow, and effectively improve the service life of the fiber mesh layer 5022. Secondly, the heating and gas gathering element 5 is fully utilized, the contact area between the alkali solution and the heating and gas gathering element 5 is increased to the maximum extent, and the heating efficiency of the heating tube 501 and the gas gathering effect of the gas gathering fiber layer 502 are improved.

[0041] like Figure 2 As shown, a connecting hole connecting the liquid inlet chamber and the first liquid discharge chamber is provided at the bottom of the first partition plate 7, and the alkali liquid in the liquid inlet chamber enters the first liquid discharge chamber through the connecting hole. A plurality of ultrasonic rods 16 are provided in the liquid inlet chamber, and the ultrasonic rods 16 are used to gather tiny bubbles in the alkali liquid discharged into the liquid inlet chamber by the heated gas collecting chamber 4. A first gas gathering fiber stacking mesh layer 9 is provided in the first liquid discharge chamber, and the first gas gathering fiber stacking mesh layer 9 is used to gather tiny bubbles in the alkali liquid entering the first liquid discharge chamber. A second gas gathering fiber stacking mesh layer 10 is provided in the second liquid discharge chamber, and the vertical pipe portion of the liquid discharge pipe 3 passes through the second gas gathering fiber stacking mesh layer 10, and the lower end port of the vertical pipe portion of the liquid discharge pipe 3 is located below the second gas gathering fiber stacking mesh layer 10. The second gas gathering fiber stacking mesh layer 10 is used to gather tiny bubbles in the alkali liquid entering the second liquid discharge chamber, and then the alkali liquid will enter the liquid discharge pipe 3 and be discharged.

[0042] like Figure 1 and Figure 2As shown, a sewage outlet is provided on the bottom wall of the liquid inlet cavity of the tank body 1 and / or the bottom wall of the first liquid discharge cavity, and a sewage valve 11 is provided at the sewage outlet for discharging sewage after long-term use.

[0043] like Figure 2 、 Figure 7 and Figure 8 As shown, the upper end of the tank body 1 is provided with an upper end provided with an exhaust port, and a liquid recovery element 6 is provided at the exhaust port. The liquid recovery element 6 includes an outer shell 601, an inner shell 602 and a bottom shell 603. The outer shell 601 and the inner shell 602 are both hollow truncated cones. The upper and lower ends of the outer shell 601 are both open, and the diameter of the upper end of the outer shell 601 is larger than the diameter of the lower end. The upper end of the outer shell 601 is connected to the exhaust port of the tank body 1. The diameter of the upper end of the inner shell 602 is smaller than the diameter of the lower end. The upper end of the inner shell 602 is sealed and the lower end is open. The bottom shell 603 is annular, and the lower end of the inner shell 602 and the lower end of the outer shell 601 are connected through the bottom shell 603. A plurality of groups of exhaust and liquid return holes 604 are provided on the side wall of the inner shell 602, and each group of exhaust and liquid return holes 604 is evenly arranged along the circumferential direction of the inner shell 602. Each set of exhaust and liquid return holes 604 includes a plurality of exhaust and liquid return holes 604 arranged sequentially along the generatrix of the sidewall of the inner shell 602. Each exhaust and liquid return hole 604 is shaped like an inverted teardrop. A connecting passage 605 is provided between two adjacent exhaust and liquid return holes 604 in each set of exhaust and liquid return holes 604. The lower end of the lowest exhaust and liquid return hole 604 in each set of exhaust and liquid return holes 604 is also provided with a connecting passage 605, which extends to the lower end of the inner shell 602. The gas and water vapor separated from the alkali solution rise, and some of the gas and water vapor directly contact the outer wall of the outer shell 601, forming condensate on the outer wall of the outer shell 601 and dripping thereon. This allows the alkali solution to be recovered, reduces alkali solution loss, and improves the purity of the collected gas. Some of the gas and water vapor directly contact the inner wall of the inner shell 602, forming condensation on the inner wall of the inner shell 602 and dripping. In addition, some of the gas and water vapor directly enter the exhaust return hole 604. When the gas contacts the hole wall of the exhaust return hole 604, it will be blocked to a certain extent. The liquid contained in the gas will accumulate here and flow through the hole wall to the connecting channel 605, and then drip and be recovered.

[0044] In some exemplary embodiments, Figure 9 As shown, the inverted teardrop-shaped exhaust and liquid return hole 604 has a wall comprising an arc portion 6041 at the upper end and a V-shaped portion 6042 at the lower end. Arc portion 6041 is textured and covered with sharp protrusions, which not only increases contact with the gas but also punctures bubbles, effectively increasing the amount of alkali liquid recovered. The V-shaped portion 6042 has a smooth surface, ensuring that accumulated alkali liquid flows down quickly.

[0045] In some exemplary embodiments, the tank body 1 is provided with one or more layers of barrier accumulation nets, which are located between the liquid recovery element 6 and the first partition 7. The barrier accumulation nets can accumulate and recover water vapor to form droplets that fall down.

[0046] In some exemplary embodiments, the outer shell 601 is hollow and is connected to a cooling medium inlet pipe and a cooling medium outlet pipe, and the cooling medium can be cold water or cold air. This can improve the effect of the outer shell 601 in recovering alkali liquid.

[0047] like Figure 1 、 Figure 2 and Figure 10 As shown, a first thermometer 13 is provided on the liquid inlet pipe 2 located outside the tank body 1. The first thermometer 13 is used to detect the temperature T1 of the alkali solution entering the tank body 1 through the liquid inlet pipe 2. A flow meter 12 is provided on the liquid inlet pipe 2 located outside the tank body 1. The flow meter 12 is used to detect the flow rate Q of the alkali solution entering the tank body 1 through the liquid inlet pipe 2. A second thermometer 14 is provided at the liquid outlet of the discharge pipe 3 located outside the tank body 1. The second thermometer 14 is used to detect the temperature T2 of the alkali solution discharged from the tank body 1 through the discharge pipe 3. An electrical control box 15 is provided on the tank body 1, and a controller and a third thermometer are provided in the electrical control box 15. The third thermometer is used to detect the ambient temperature T3. The first thermometer 13, the flowmeter 12, the second thermometer 14 and the third thermometer are all electrically connected to the controller. The controller has a control module, a calculation module and a storage module. The storage module stores the process temperature T0 of the alkali solution during electrolysis in the electrolytic cell. Then T0=T2-T4, wherein T4 is the loss temperature of the alkali solution due to heat loss when it flows back to the electrolytic cell from the discharge pipe 3, T4=f(Q, T2, T3), and the calculation module calculates the discharge temperature T20 required for the tank body 1 through the formula T2=T0+f(Q, T2, T3). The heating pipe 501 is connected to a hot liquid supply device, which includes an electric heating module. If T20>T2, and (T20-T2) / T2≥N%, where 2≤N≤5, indicating that T2 is too low, the control module of the controller transmits a temperature increase signal to the hot liquid supply device, causing the hot liquid supply device to increase the power of the electric heating module. If T20<T2, and (T2-T20) / T2≥M%, where 2≤M≤5, indicating that T2 is too high, the control module of the controller transmits a temperature decrease signal to the hot liquid supply device, causing the hot liquid supply device to stop the electric heating module.

[0048] T4 = f(Q, T2, T3) = f(T2) × f(Q, T3), where f(T2) is the temperature adjustment coefficient. f(T2) can be expressed in Table 1:

[0049] Table 1

[0050] T2 f(T2) T21≤T2<T22 A1 T22≤T2<T23 A2 …… …… T2k≤T2 Ak

[0051] f(Q, T3) can be expressed by Table 2:

[0052] Table 2

[0053]

[0054] In Table 1 and Table 2, n, m, and k are all integers greater than 1.

[0055] Both Table 1 and Table 2 are stored in the storage module of the controller. When the calculation module of the controller calculates T4 through the formula T4 = f(Q, T2, T3) = f(T2) × f(Q, T3), f(T2) and f(Q, T3) are called from Table 1 and Table 2.

[0056] Heating tube 501 of heating gas gathering element 5 flows through a heating liquid at a temperature of T5, i.e., the temperature of the liquid supplied by the hot liquid supply device. If T0 > T1, then T5 > T0. If T1 ≥ T0, indicating an abnormality in the heating element or temperature sensing element in the electrolytic cell, the control module of the controller sends an alarm signal to the electrolytic cell.

[0057] The working principle of the present invention is as follows: The present invention is provided with a heating gas collection chamber 4, which is provided with a heating gas collection element 5. The heating gas collection element 5 heats the alkali liquid, increasing the temperature of the alkali liquid and reducing the solubility of the gas in the alkali liquid, thereby enhancing gas-liquid separation for the first time. The gas collection fiber layer 502 of the heating gas collection element 5 gathers tiny bubbles in the alkali liquid, thereby enhancing gas-liquid separation for the second time. The ultrasonic rod 16 gathers tiny bubbles in the alkali liquid discharged from the heating gas collection chamber 4 into the liquid inlet chamber, thereby enhancing gas-liquid separation for the third time. The first gas collection fiber stacking mesh layer 9 provided in the first liquid discharge chamber gathers tiny bubbles in the alkali liquid entering the first liquid discharge chamber, thereby enhancing gas-liquid separation for the fourth time. The second gas collection fiber stacking mesh layer 10 in the second liquid discharge chamber gathers tiny bubbles in the alkali liquid entering the second liquid discharge chamber, thereby enhancing gas-liquid separation for the fifth time. Only after the five enhanced gas-liquid separations are completed will the alkali liquid enter the liquid discharge pipe 3 for discharge. Therefore, the present invention can gather tiny bubbles in the alkali liquid, effectively improving the gas-liquid separation efficiency and separation effect.

[0058] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A gas-liquid separation device for producing hydrogen by alkaline water electrolysis, comprising a tank body (1), wherein the tank body (1) is provided with a liquid inlet pipe (2) and a liquid discharge pipe (3), characterized in that: The tank body (1) is provided with a heating gas gathering chamber (4), the liquid inlet pipe (2) is connected to the heating gas gathering chamber (4), the heating gas gathering chamber (4) is provided with a heating gas gathering element (5), the heating gas gathering element (5) is used to heat the alkali solution entering from the liquid inlet pipe (2) and gather tiny bubbles in the alkali solution, the heating gas gathering chamber (4) is provided with a liquid discharge port, the liquid discharge port and the liquid inlet pipe (2) are respectively located on both sides of the heating gas gathering element (5); the upper end of the tank body (1) is provided with an exhaust port, the exhaust port is provided with a liquid recovery element (6), and the liquid recovery element (6) is provided with an exhaust and liquid return hole (604).

2. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 1, wherein: The heating and gas gathering element (5) comprises a heating tube (501) and a gas gathering fiber layer (502) which are arranged in an overlapping manner. The heating tube (501) has a multiple S-shaped structure, comprising a straight tube portion and an arc-shaped curved tube portion connecting adjacent straight tube portions. A plurality of heating tubes (501) are arranged along the overlapping direction, and the straight tube portions of adjacent heating tubes (501) are perpendicular to each other. The two ends of the heating tube (501) are respectively connected to a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe both pass through the tank wall of the tank body (1) and are connected to a hot liquid supply device.

3. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 2, wherein: The gas-gathering fiber layer (502) comprises a rectangular frame (5021), a fiber mesh layer (5022), a front hard material mesh layer (5023) and a rear hard material mesh layer (5024); the fiber mesh layer (5022), the front hard material mesh layer (5023) and the rear hard material mesh layer (5024) are all arranged in the rectangular frame (5021); the fiber mesh layer (5022) is located between the front hard material mesh layer (5023) and the rear hard material mesh layer (5024); the front hard material mesh layer (5023) is composed of a plurality of mutually parallel first bars; the rear hard material mesh layer (5024) is composed of a plurality of mutually parallel second bars; the first bars are perpendicular to the second bars; and the first bars are perpendicular to the straight tube portion of the heating tube (501) on the front side thereof.

4. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 1, wherein: A first partition (7) is provided in the tank body (1), the liquid inlet pipe (2) and the liquid discharge pipe (3) are respectively located on both sides of the first partition (7), the side of the first partition (7) close to the liquid inlet pipe (2) is a liquid inlet cavity, and the side of the first partition (7) close to the liquid discharge pipe (3) is a liquid discharge cavity, the heating gas collection chamber (4) is located in the liquid inlet cavity, and the alkali liquid discharged from its discharge port all enters the liquid inlet cavity; a connecting hole connecting the liquid inlet cavity and the liquid discharge cavity is provided at the bottom of the first partition (7), and a plurality of ultrasonic rods (16) are provided in the liquid inlet cavity.

5. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: A second partition (8) is provided in the drainage chamber, the second partition (8) is parallel to the first partition (7), and the second partition (8) divides the drainage chamber into a first drainage chamber and a second drainage chamber, the first drainage chamber is located between the first partition (7) and the second partition (8), and a first gas-gathering fiber stacking mesh layer (9) is provided in the first drainage chamber; the drainage pipe (3) is L-shaped, including a transverse pipe portion and a vertical pipe portion, and the transverse pipe portion is located at the upper end of the vertical pipe portion, the vertical pipe portion of the drainage pipe (3) is located in the second drainage chamber, and the transverse pipe portion of the drainage pipe (3) passes through the tank The tank body (1) is provided with a horizontal pipe portion of the drainage pipe (3) being lower than the upper end of the second partition (8), and the upper end of the second partition (8) being lower than the upper end of the first partition (7); a second gas-gathering fiber stacking mesh layer (10) is provided in the second drainage chamber, the vertical pipe portion of the drainage pipe (3) passes through the second gas-gathering fiber stacking mesh layer (10), and the lower end port of the vertical pipe portion of the drainage pipe (3) is located below the second gas-gathering fiber stacking mesh layer (10); a sewage outlet is provided on the bottom wall of the liquid inlet chamber and / or the bottom wall of the first drainage chamber, and a sewage valve (11) is provided at the sewage outlet.

6. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The liquid recovery element (6) comprises an outer shell (601), an inner shell (602) and a bottom shell (603). The outer shell (601) and the inner shell (602) are both hollow truncated cone-shaped. The upper and lower ends of the outer shell (601) are both open, and the diameter of the upper end of the outer shell (601) is larger than the diameter of the lower end. The upper end of the outer shell (601) is connected to the exhaust port of the tank body (1); the diameter of the upper end of the inner shell (602) is smaller than the diameter of the lower end. The upper end of the inner shell (602) is sealed and the lower end is open. A plurality of exhaust and liquid return holes (604) are provided on the side wall of the inner shell (602); the bottom shell (603) is annular, and the lower end of the inner shell (602) and the lower end of the outer shell (601) are connected via the bottom shell (603).

7. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 6, characterized in that: The exhaust and liquid return holes (604) are provided in multiple groups on the side wall of the inner shell (602), and each group of exhaust and liquid return holes (604) is evenly arranged along the circumferential direction of the inner shell (602); each group of exhaust and liquid return holes (604) includes multiple exhaust and liquid return holes (604) arranged in sequence along the busbar direction of the side wall of the inner shell (602), and the exhaust and liquid return holes (604) are in the shape of inverted water drops; in each group of exhaust and liquid return holes (604), a connecting channel (605) is provided between two adjacent exhaust and liquid return holes (604); in each group of exhaust and liquid return holes (604), a connecting channel (605) is also provided at the lower end of the lowest exhaust and liquid return hole (604), and the connecting channel (605) extends to the lower end of the inner shell (602).

8. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The liquid inlet pipe (2) is provided with a flow meter (12) on the pipe body outside the tank body (1), and the flow meter (12) is used to detect the flow rate Q of the alkali solution entering the tank body (1) from the liquid inlet pipe (2); the liquid outlet of the liquid discharge pipe (3) is provided with a second thermometer (14) at the liquid outlet outside the tank body (1), and the second thermometer (14) is used to detect the temperature T2 of the alkali solution discharged from the tank body (1) through the liquid discharge pipe (3); the tank body (1) is provided with an electric control box (15), and the electric control box (15) is provided with a controller and a third thermometer, and the third thermometer is used to detect the ambient temperature T3. The flow meter (12), the second thermometer (14) and the third thermometer are all electrically connected to the controller, and the controller has a control module, a calculation module and a storage module. The storage module stores the process temperature T0 of the alkali solution during electrolysis of the alkali solution in the electrolytic cell. T0=T2-T4, wherein T4 is the temperature of the alkali solution that is lowered due to heat loss when the alkali solution flows back from the discharge pipe (3) to the electrolytic cell, T4=f(Q, T2, T3), and the calculation module calculates the required discharge temperature T20 of the tank body (1) through the formula T2=T0+f(Q, T2, T3); the heating pipe (501) is connected to a hot liquid supply device, and the hot liquid supply device has an electric heating module. If T20>T2, and (T20-T2) / T2≥N%, where 2≤N≤5, the control module of the controller transmits a temperature increase signal to the hot liquid supply device, and the hot liquid supply device controls to increase the power of the electric heating module. If T20<T2, and (T2-T20) / T2≥M%, where 2≤M≤5, the control module of the controller transmits a temperature reduction signal to the hot liquid supply device, and the hot liquid supply device controls to stop the electric heating module.

9. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 8, characterized in that: T4=f(Q, T2, T3)=f(T2)×f(Q, T3).

10. The gas-liquid separation device for producing hydrogen by alkaline water electrolysis according to claim 9, characterized in that: The liquid inlet pipe (2) is provided with a first thermometer (13), the first thermometer (13) is located outside the tank body (1), and the first thermometer (13) is used to detect the temperature T1 of the alkali solution entering the tank body (1) through the liquid inlet pipe (2). The first thermometer (13) is electrically connected to the controller. The heating gas gathering element (5) has a heating tube (501), and a heating liquid flows through the heating tube (501). The temperature of the heating liquid is T5. If T0>T1, then T5>T0. If T1≥T0, the control module of the controller sends an alarm signal to the electrolytic cell.

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