Gas-liquid separation system and electrolysis system

Abstract

The application provides a gas-liquid separation system and an electrolysis system. The gas-liquid separation system comprises a hydrogen-alkali vertical gas-liquid separator, an oxygen-alkali vertical gas-liquid separator, a first alkali preparation tank and a second alkali preparation tank. The hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator are both provided with a gas-liquid separation structure, a gas washing structure, a gas cooling structure and a gas-water separation structure from bottom to top. The pressure value in the first alkali preparation tank is lower than the pressure value in the hydrogen-alkali vertical gas-liquid separator, so that the alkali liquor flowing out of the first liquid outlet is flashed. The pressure value in the second alkali preparation tank is lower than the pressure value in the oxygen-alkali vertical gas-liquid separator, so that the alkali liquor flowing out of the second liquid outlet is flashed. In the application, the gas-liquid separation structure, the gas washing structure, the gas cooling structure and the gas-water separation structure are integrated into the corresponding vertical gas-liquid separator, and the flash evaporation is performed by using the alkali preparation tank without setting an additional flash evaporation structure, so that the overall size of the gas-liquid separation system can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of electrolysis system technology, and in particular to a gas-liquid separation system and an electrolysis system. Background Technology

[0002] The electrolysis of water to produce hydrogen involves separating the hydrogen, oxygen, and alkaline solution generated by electrolysis in an electrolyzer through a gas-liquid separator. Currently, the main equipment used in this process includes horizontal hydrogen-alkali gas-liquid separators, hydrogen scrubbers, hydrogen coolers, hydrogen gas-water separators, horizontal oxygen-alkali gas-liquid separators, oxygen scrubbers, oxygen coolers, and oxygen gas-water separators. This involves a large number of devices, with each component dispersed. Even when assembled into skids, the large size of the skids, high cost, and long installation period hinder on-site installation and mass production of the skids.

[0003] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0004] The main purpose of this application is to provide a gas-liquid separation system and an electrolysis system, which aims to solve the technical problem that the overall size of the gas-liquid separation system in the prior art is too large.

[0005] To achieve the above objectives, this application provides a gas-liquid separation system, comprising: a hydrogen-alkali vertical gas-liquid separator, an oxygen-alkali vertical gas-liquid separator, a first alkali mixing tank, and a second alkali mixing tank;

[0006] The inlet of the hydrogen-alkali vertical gas-liquid separator and the inlet of the oxygen-alkali vertical gas-liquid separator are both connected to the electrolytic cell. The top of the hydrogen-alkali vertical gas-liquid separator is provided with a hydrogen outlet, and the top of the oxygen-alkali vertical gas-liquid separator is provided with an oxygen outlet.

[0007] The bottom end of the hydrogen-alkali vertical gas-liquid separator is provided with a first liquid outlet, which is connected to the electrolytic cell through the first alkali mixing tank; the bottom end of the oxygen-alkali vertical gas-liquid separator is provided with a second liquid outlet, which is connected to the electrolytic cell through the second alkali mixing tank.

[0008] Both the hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator are equipped with a gas-liquid separation structure, a gas washing structure, a gas cooling structure, and a gas-water separation structure from bottom to top.

[0009] The pressure in the first alkali mixing tank is lower than the pressure in the hydrogen-alkali vertical gas-liquid separator, and is used to flash evaporate the alkali solution flowing out of the first liquid outlet; and / or, the pressure in the second alkali mixing tank is lower than the pressure in the oxygen-alkali vertical gas-liquid separator, and is used to flash evaporate the alkali solution flowing out of the second liquid outlet.

[0010] Optionally, a first water supply switch valve is provided at the gas washing structure position on the hydrogen-alkali vertical gas-liquid separator, and a first liquid level gauge is provided on one side of the first alkali tank; the setting parameters of the opening degree of the first water supply switch valve include: the liquid level height in the first alkali tank detected by the first liquid level gauge;

[0011] A second water supply switch valve is provided at the gas washing structure position on the oxygen-alkali vertical gas-liquid separator, and a second liquid level gauge is provided on one side of the second alkali tank; the setting parameters of the opening degree of the second water supply switch valve include: the liquid level height in the second alkali tank detected by the second liquid level gauge.

[0012] Optionally, the gas-liquid separation system further includes: a cooling circuit and a first temperature transmitter;

[0013] The first temperature transmitter is located at the outlet of the electrolytic cell and is used to detect the first temperature at the outlet of the electrolytic cell.

[0014] Both the first and second alkali mixing tanks are equipped with heat exchangers, which are connected to the first cooling branch of the cooling circuit. A circulating water regulating valve is installed on the first cooling branch. The setting parameters for the opening of the circulating water regulating valve include the first temperature.

[0015] Optionally, the gas-liquid separation system further includes: a second temperature transmitter and a third temperature transmitter;

[0016] The second temperature transmitter is located at the junction of the alkali return pipelines of the first alkali tank and the second alkali tank, and is used to detect the second temperature at the junction of the alkali return pipelines.

[0017] The third temperature transmitter is installed at the outlet of the alkali return pipeline and is used to detect the third temperature at the outlet of the alkali return pipeline.

[0018] The setting parameters for the opening degree of the circulating water regulating valve also include: the second temperature and the third temperature.

[0019] Optionally, the cooling circuit further includes: a second cooling branch and a third cooling branch;

[0020] The second cooling branch is connected to the gas cooling structure inside the hydrogen-alkali vertical gas-liquid separator;

[0021] The third cooling branch is connected to the gas cooling structure inside the oxygen-alkali vertical gas-liquid separator.

[0022] Optionally, a third level gauge is provided on one side of the vertical hydrogen-alkali gas-liquid separator, and a first level regulating valve is provided on the alkali pipeline between the vertical hydrogen-alkali gas-liquid separator and the first alkali mixing tank; the setting parameters for the opening of the first level regulating valve include: the liquid level height in the vertical hydrogen-alkali gas-liquid separator detected by the third level gauge; and / or,

[0023] A fourth level gauge is installed on one side of the oxygen-alkali vertical gas-liquid separator, and a second level regulating valve is installed on the alkali pipeline between the oxygen-alkali vertical gas-liquid separator and the second alkali mixing tank; the setting parameters for the opening of the second level regulating valve include: the liquid level height in the oxygen-alkali vertical gas-liquid separator detected by the fourth level gauge.

[0024] Optionally, a pressure transmitter and a pressure regulating valve are installed at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator;

[0025] The pressure transmitter is used to detect the pressure value at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator.

[0026] The pressure regulating valve is used to adjust the outlet opening of the oxygen-alkali vertical gas-liquid separator. The setting parameters for the opening of the pressure regulating valve include the pressure value at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator.

[0027] Optionally, a differential pressure gauge is also provided between the oxygen-alkali vertical gas-liquid separator and the hydrogen-alkali vertical gas-liquid separator to detect the pressure difference between them.

[0028] The hydrogen outlet of the vertical hydrogen-alkali gas-liquid separator is equipped with a differential pressure regulating valve to adjust the pressure difference.

[0029] Optionally, the gas-liquid separation system further includes: an alkali replenishment pump;

[0030] The alkali replenishment pump is installed on the alkali return pipeline connected to the alkali return port of the electrolytic cell, and is used to regulate the alkali returning to the electrolytic cell.

[0031] In addition, to achieve the above objectives, this application also provides an electrolysis system, which includes an electrolytic cell and the gas-liquid separation system described in any of the above claims.

[0032] This application provides a gas-liquid separation system and an electrolysis system. The gas-liquid separation system includes: a hydrogen-alkali vertical gas-liquid separator, an oxygen-alkali vertical gas-liquid separator, a first alkali mixing tank, and a second alkali mixing tank. The inlets of both the hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator are connected to an electrolytic cell. The top of the hydrogen-alkali vertical gas-liquid separator has a hydrogen outlet, and the top of the oxygen-alkali vertical gas-liquid separator has an oxygen outlet. The bottom of the hydrogen-alkali vertical gas-liquid separator has a first liquid outlet, which is connected to the electrolytic cell via the first alkali mixing tank. The bottom of the oxygen-alkali vertical gas-liquid separator has a second liquid outlet, which is connected to the electrolytic cell via the second alkali mixing tank. Both the hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator have, from bottom to top, a gas-liquid separation structure, a gas washing structure, a gas cooling structure, and a gas-water separation structure. In this application, the gas-liquid separation structure, gas washing structure, gas cooling structure and gas-water separation structure are integrated to form the corresponding hydrogen-alkali vertical gas-liquid separator and oxygen-alkali vertical gas-liquid separator. Furthermore, the flash evaporation is performed using an alkali mixing tank, eliminating the need for an additional flash evaporation structure, which effectively reduces the overall size of the gas-liquid separation system. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the first embodiment of the gas-liquid separation system proposed in this application;

[0035] Figure 2 This is a first structural schematic diagram of the second embodiment of the gas-liquid separation system proposed in this application;

[0036] Figure 3 This is a second structural schematic diagram of the second embodiment of the gas-liquid separation system proposed in this application;

[0037] Figure 4 This is a schematic diagram of the structure of the third embodiment of the gas-liquid separation system proposed in this application;

[0038] Figure 5 This is a schematic diagram of the fourth embodiment of the gas-liquid separation system proposed in this application.

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the gas-liquid separation system proposed in the first embodiment of the gas-liquid separation system of this application. Figure 1 The structure includes a hydrogen-alkali vertical gas-liquid separator 1, an oxygen-alkali vertical gas-liquid separator 2, a first alkali mixing tank 3, and a second alkali mixing tank 4.

[0045] The inlet of the hydrogen-alkali vertical gas-liquid separator 1 and the inlet of the oxygen-alkali vertical gas-liquid separator 2 are respectively connected to the hydrogen outlet and oxygen outlet of the electrolytic cell 100. The top of the hydrogen-alkali vertical gas-liquid separator 1 is provided with a hydrogen outlet, and the top of the oxygen-alkali vertical gas-liquid separator 2 is provided with an oxygen outlet.

[0046] The bottom end of the hydrogen-alkali vertical gas-liquid separator 1 is provided with a first liquid outlet, which is connected to the electrolytic cell 100 through the first alkali mixing tank 3; the bottom end of the oxygen-alkali vertical gas-liquid separator 2 is provided with a second liquid outlet, which is connected to the electrolytic cell 100 through the second alkali mixing tank 4.

[0047] Both the hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator are equipped with a gas-liquid separation structure 5, a gas washing structure 6, a gas cooling structure 7, and a gas-water separation structure 8 arranged from bottom to top.

[0048] It should be understood that in the gas-liquid separation process, whether it is the removal of hydrogen or oxygen, gas-liquid separators, scrubbers, coolers, and gas-water separators are usually required. A pressure separator separates the gas present in the alkaline solution from the alkaline solution. Then, a scrubber washes the separated gas to remove residual liquid. Next, a cooler cools the washed gas. Finally, a gas-water separator removes any remaining moisture from the gas, thus obtaining crude hydrogen or oxygen.

[0049] It is understood that the vertical gas-liquid separator is an integrated gas-liquid separator, which includes: a hydrogen-alkali vertical gas-liquid separator 1 and an oxygen-alkali vertical gas-liquid separator 2. The hydrogen-alkali vertical gas-liquid separator 1 integrates a hydrogen-alkali gas-liquid separation structure, a hydrogen gas washing structure, a hydrogen gas cooling structure, and a hydrogen gas-water separation structure. The oxygen-alkali vertical gas-liquid separator 2 integrates an oxygen-alkali gas-liquid separation structure, an oxygen gas washing structure, an oxygen gas cooling structure, and an oxygen gas-water separation structure.

[0050] It should be noted that the alkali preparation tank is a device used to provide the required alkali solution for the electrolysis process and ensure its smooth operation. The alkali preparation tank prepares the electrolyte and supplies the water and alkali solution consumed during electrolysis to the hydrogen production system, ensuring the stability and efficiency of the electrolysis process. The alkali preparation tank typically includes a pure water tank, an alkali solution tank, an alkali preparation pump, and a water replenishment pump, which work together to ensure the smooth operation of the electrolysis process. In this embodiment, the first alkali preparation tank 3 is connected to the hydrogen-alkali vertical gas-liquid separator 1 and the electrolytic cell 100, and can prepare the alkali solution returning from the hydrogen-alkali vertical gas-liquid separator 1. The second alkali preparation tank 4 is connected to the oxygen-alkali vertical gas-liquid separator 2 and the electrolytic cell 100, and is used to prepare the alkali solution returning from the oxygen-alkali vertical gas-liquid separator 2, thereby ensuring that the alkali solution in the electrolytic cell 100 meets the electrolysis requirements.

[0051] The hydrogen-alkali vertical gas-liquid separator 1 has a first liquid outlet at its bottom, used to discharge the separated alkali solution inside the separator 1 to the first alkali mixing tank 3. The first liquid outlet and the first alkali mixing tank 3 are connected by an alkali return pipeline. Similarly, the oxygen-alkali vertical gas-liquid separator 2 has a second liquid outlet at its bottom, used to discharge the separated alkali solution inside the separator 2 to the second alkali mixing tank 4. The second liquid outlet and the second alkali mixing tank 4 are connected by an alkali return pipeline. The hydrogen-alkali vertical gas-liquid separator 1 has a hydrogen outlet at its top, used to discharge the separated hydrogen; the oxygen-alkali vertical gas-liquid separator 2 has an oxygen outlet at its top, used to discharge the separated oxygen.

[0052] In this embodiment, the gas-liquid mixture on the hydrogen side after electrolysis in the electrolytic cell 100 can be input into the hydrogen-alkali vertical gas-liquid separator 1. After being processed by the gas-liquid separation structure 5, gas washing structure 6, gas cooling structure 7, and gas-water separation structure 8 in the hydrogen-alkali vertical gas-liquid separator 1, the hydrogen is output through the hydrogen outlet, and the separated alkali solution is returned to the electrolytic cell 100 through the first alkali mixing tank 3. The gas-liquid mixture on the oxygen side can be input into the oxygen-alkali vertical gas-liquid separator 2. After being processed by the gas-liquid separation structure, gas washing structure, gas cooling structure, and gas-water separation structure in the oxygen-alkali vertical gas-liquid separator 2, the oxygen is output through the hydrogen outlet, and the separated alkali solution is returned to the electrolytic cell 100 through the second alkali mixing tank 4.

[0053] This embodiment provides a gas-liquid separation system, including: a hydrogen-alkali vertical gas-liquid separator 1, an oxygen-alkali vertical gas-liquid separator 2, a first alkali mixing tank 3, and a second alkali mixing tank 4; the inlet of the hydrogen-alkali vertical gas-liquid separator 1 and the inlet of the oxygen-alkali vertical gas-liquid separator 2 are both connected to an electrolytic cell 100; the top of the hydrogen-alkali vertical gas-liquid separator 1 is provided with a hydrogen outlet, and the top of the oxygen-alkali vertical gas-liquid separator 2 is provided with an oxygen outlet; the bottom of the hydrogen-alkali vertical gas-liquid separator 1 is provided with a first liquid outlet, which is connected to the electrolytic cell 100 through the first alkali mixing tank 3; the bottom of the oxygen-alkali vertical gas-liquid separator 2 is provided with a second liquid outlet, which is connected to the electrolytic cell 100 through the second alkali mixing tank 4; both the hydrogen-alkali vertical gas-liquid separator 1 and the oxygen-alkali vertical gas-liquid separator 2 are provided with a gas-liquid separation structure 5, a gas washing structure 6, a gas cooling structure 7, and a gas-water separation structure 8 from bottom to top. In this application, by integrating the gas-liquid separation structure 5, the gas washing structure 6, the gas cooling structure 7, and the gas-water separation structure 8 into the corresponding hydrogen-alkali vertical gas-liquid separator 1 and oxygen-alkali vertical gas-liquid separator 2, the overall size of the gas-liquid separation system can be effectively reduced.

[0054] Furthermore, in this embodiment, the first alkali mixing tank 3 and the second alkali mixing tank 4 can be used as flash evaporators. By setting the pressure value inside the first alkali mixing tank 3 to be lower than the pressure value inside the hydrogen-alkali vertical gas-liquid separator 1, when the alkali solution flows into the first alkali mixing tank 3 from the first liquid outlet, the pressure value in the space where the alkali solution is located decreases, thereby flash evaporating the alkali solution, reducing the dissolved gas content in the alkali solution, and allowing more hydrogen to be discharged from the alkali solution. Similarly, when the pressure value inside the second alkali mixing tank 4 is lower than the pressure value inside the oxygen-alkali vertical gas-liquid separator 2, when the alkali solution flows into the second alkali mixing tank 4 from the second liquid outlet, the pressure value in the space where the alkali solution is located decreases, thereby flash evaporating the alkali solution, reducing the dissolved gas content in the alkali solution, and allowing more oxygen to be discharged from the alkali solution.

[0055] It is understandable that the first alkali mixing tank 3 and the second alkali mixing tank 4 can be atmospheric pressure tanks with a standard atmosphere, or unsealed alkali mixing tanks. Since the internal pressure values ​​of the hydrogen-alkali vertical gas-liquid separator 1 and the oxygen-alkali vertical gas-liquid separator 2 are usually greater than a standard atmosphere, the alkali solution can be flash-distilled when it flows into the alkali mixing tank.

[0056] Furthermore, during the flash evaporation process using the first alkali mixing tank 3 and the second alkali mixing tank 4, considering that the pressure inside the alkali mixing tank is lower than the pressure inside the vertical gas-liquid separator, an open-type alkali mixing tank can be used. The internal pressure of an open-type alkali mixing tank is atmospheric pressure, and the tank is in direct contact with the atmosphere. This may cause the alkali solution to react with some gases in the atmosphere or result in alkali evaporation, leading to alkali loss. To avoid alkali loss in the open-type alkali mixing tank, a protective gas can be installed inside. For example, a certain amount of nitrogen can be injected into the tank. Using nitrogen as a protective gas can effectively prevent alkali loss.

[0057] In this embodiment, by integrating the gas-liquid separation structure 5, the gas washing structure 6, the gas cooling structure 7, and the gas-water separation structure 8, and by adjusting the alkali preparation tank to a flash evaporator, not only can the overall size of the gas-liquid separation system be reduced, but the purity of the separated gas can also be improved.

[0058] Based on the first embodiment of the gas-liquid separation system described above, a second embodiment of the gas-liquid separation system of this application is proposed. (Refer to...) Figure 2 , Figure 2 This is a first structural schematic diagram of the second embodiment of the gas-liquid separation system proposed in this application.

[0059] In this embodiment, a first water supply switch valve 9 is provided at the gas washing structure 6 position on the hydrogen-alkali vertical gas-liquid separator 1, and a first liquid level gauge 10 is provided on one side of the first alkali tank 3; the setting parameters of the opening degree of the first water supply switch valve 9 include: the liquid level height in the first alkali tank 3 detected by the first liquid level gauge 10.

[0060] A second water supply switch valve 11 is provided at the gas washing structure 6 position on the oxygen-alkali vertical gas-liquid separator 2, and a second liquid level gauge 12 is provided on one side of the second alkali tank 4; the setting parameters of the opening degree of the second water supply switch valve 11 include: the liquid level height in the second alkali tank detected by the second liquid level gauge 12.

[0061] It should be understood that during the gas-liquid separation process, the gas-liquid washing structure 6 is needed to wash the separated hydrogen or oxygen to reduce the residual alkali in the gas. During the washing process, the necessary water needs to be obtained externally, therefore a water inlet needs to be provided on one side of the gas washing structure 6. Furthermore, the electrolytic cell 100 contains water and alkali, and hydrogen and oxygen are continuously generated during electrolysis. However, because the water in the electrolytic cell 100 is continuously consumed during electrolysis, the concentration of alkali needs to be maintained stably; therefore, water also needs to be replenished to the electrolytic cell 100 during electrolysis. Therefore, at least two water inlet structures are required during electrolysis: one to supply water to the gas washing structure 6 and the other to replenish water to the electrolytic cell 100.

[0062] In this application, due to the installation of the hydrogen-alkali vertical gas-liquid separator 1 and the oxygen-alkali vertical gas-liquid separator 2, the moisture in the washing gas can be directly returned to the electrolytic cell 100 through the alkali mixing tank to replenish the water in the electrolytic cell 100. Therefore, with only one water supply pipe, washing water can be directly provided to the gas washing structure 6 and water can be replenished for the electrolysis process in the electrolytic cell 100. This reduces the water-using structure required by the separation system during the electrolysis process, reduces the structure required for the electrolysis process, and further reduces the size of the gas-liquid separation system.

[0063] Furthermore, considering that the amount of water used for washing during electrolysis and the amount of water required to replenish the electrolytic cell 100 are different, the opening degree of the water replenishment switch valve 11 needs to be controlled during the water replenishment process.

[0064] It should be noted that the water supply valve is used to control the water inlet flow of the gas scrubbing structure 6. A larger opening of the water supply valve results in a greater water inlet flow into the gas scrubbing structure 6, and vice versa. Considering that water generated during the scrubbing process will flow back to the electrolytic cell 100 via the alkali mixing tank, the opening of the water supply valve can be controlled by the amount of liquid present in the alkali mixing tank; that is, the water supply valve is interlocked with the liquid level in the alkali mixing tank. When the liquid level in the alkali mixing tank is high, more water flows back to the electrolytic cell 100, so the opening of the water supply valve can be reduced. Conversely, when the liquid level in the alkali mixing tank is low, insufficient water flows back to the electrolytic cell 100, so the opening of the water supply valve can be increased.

[0065] In this embodiment, the water supply switch valve may include a first water supply switch valve 9 and a second water supply switch valve 11; wherein the first water supply switch valve 9 is used to control the water inlet of the gas washing structure 6 on the hydrogen-alkali vertical gas-liquid separator 1, and the second water supply switch valve 11 is used to control the water inlet of the gas washing structure 6 on the oxygen-alkali vertical gas-liquid separator 2.

[0066] In addition, a level gauge can be installed on one side of the alkali mixing tank to detect the liquid level inside the tank. This level gauge may include a first level gauge 10 and a second level gauge 12. The first level gauge 10 is used to detect the liquid level inside the first alkali mixing tank 3, and the second level gauge 12 is used to detect the liquid level inside the second alkali mixing tank.

[0067] In specific implementation, the first water replenishment switch valve 9 is interlocked with the first level gauge 10, and the second water replenishment switch valve 11 is interlocked with the second level gauge 12. On the hydrogen-alkali vertical gas-liquid separator 1 side, the liquid level in the first alkali mixing tank 3 is detected by the first level gauge 10, and then the opening of the first water replenishment switch valve 9 is controlled according to the liquid level in the first alkali mixing tank 3; on the oxygen-alkali vertical gas-liquid separator 2 side, the liquid level in the second alkali mixing tank 4 is detected by the second level gauge 12, and then the opening of the second water replenishment switch valve 11 is controlled according to the liquid level in the second alkali mixing tank 4, thereby controlling the concentration of alkali in the electrolysis system to remain stable.

[0068] Reference Figure 3 , Figure 3 This is a second structural schematic diagram of a second embodiment of the gas-liquid separation system proposed in this application. The gas-liquid separation system further includes: a cooling circuit and a first temperature transmitter 13;

[0069] The first temperature transmitter 13 is installed at the outlet of the electrolytic cell 100 and is used to detect the first temperature at the outlet of the electrolytic cell 100.

[0070] Both the first alkali mixing tank 3 and the second alkali mixing tank 4 are equipped with heat exchangers. The heat exchangers are connected to the first cooling branch of the cooling circuit. A circulating water regulating valve 14 is installed on the first cooling branch. The setting parameters for the opening of the circulating water regulating valve 14 include: the first temperature.

[0071] It should be understood that temperature is a crucial factor in controlling the electrolysis process. Under suitable temperatures, a greater quantity of hydrogen and oxygen can be electrolyzed, while under unsuitable temperatures, the amount of hydrogen and oxygen produced will be significantly reduced. Therefore, in this embodiment, a cooling circuit and a first temperature transmitter 13 are also included in the gas-liquid separation system. Furthermore, a heat exchanger is installed in the alkali mixing tank to regulate the temperature of the liquid within the tank, thereby maintaining a stable temperature within the electrolytic cell 100 for the alkali solution and water returning to it. The first temperature transmitter 13 is used to detect the temperature of the gas-liquid mixture discharged after electrolysis within the electrolytic cell 100. Multiple cooling branches can be provided in the cooling circuit, converging or splitting the gas and liquid through the same main circuit to regulate the temperature within the separation system.

[0072] It should be noted that the first cooling branch is the cooling branch connected to the heat exchanger inside the alkali preparation tank. The first temperature is the temperature of the gas-liquid mixture discharged after electrolysis in the electrolytic cell 100. The circulating water regulating valve 14 is used to control the amount of liquid flowing back into the electrolytic cell 100 from the alkali return pipeline. During the electrolysis process, in order to maintain a stable temperature inside the electrolytic cell 100, a condenser for the electrolytic cell 100 is usually required to regulate the liquid temperature inside the electrolytic cell 100.

[0073] In this embodiment, the heat exchanger installed in the alkali mixing tank can directly cool the liquid inside the tank. The amount of liquid returning to the electrolytic cell 100 is then controlled directly using the circulating water regulating valve 14, thereby maintaining a stable temperature within the electrolytic cell 100. For example, if the first temperature transmitter 13 detects that the temperature of the gas-liquid mixture discharged from the electrolytic cell 100 is high or low, the cooling circuit and heat exchanger cool the liquid in the alkali mixing tank. Then, the circulating water regulating valve 14 returns an appropriate amount of liquid from the alkali mixing tank to the electrolytic cell 100. Without the need for a condenser in the electrolytic cell 100, the liquid temperature within the electrolytic cell 100 can be regulated to maintain a stable temperature. Therefore, a condenser in the electrolytic cell 100 is not required in the gas-liquid separation system, further reducing the number of components required and the size of the gas-liquid separation system.

[0074] The gas-liquid separation system also includes: a second temperature transmitter 15 and a third temperature transmitter 16;

[0075] The second temperature transmitter 15 is installed at the junction of the alkali return pipelines of the first alkali tank 3 and the second alkali tank 4, and is used to detect the second temperature at the junction of the alkali return pipelines.

[0076] The third temperature transmitter 16 is installed at the outlet of the alkali return pipeline and is used to detect the third temperature at the outlet of the alkali return pipeline.

[0077] The opening parameters of the circulating water regulating valve 14 also include: the second temperature and the third temperature.

[0078] It should be noted that since the first temperature transmitter 13 is located at the outlet of the gas-liquid mixture in the electrolytic cell 100, the alkaline solution needs to go through complete gas-liquid separation and alkaline tank adjustment during the alkali reflux process. During this process, the temperature in the electrolytic cell 100 may change, resulting in a certain lag in the first temperature collected by the first temperature transmitter 13. This causes the amount of liquid refluxed into the electrolytic cell 100 to be unsuitable, which in turn causes the temperature of the electrolytic cell 100 to be unsuitable.

[0079] To avoid the aforementioned problems, this embodiment also includes a second temperature transmitter 15 and a third temperature transmitter 16. The third temperature transmitter 16 is used to detect the second temperature at the junction of the alkali return pipeline connecting the first alkali tank 3 and the second alkali tank 4, i.e., the temperature of the liquid flowing out of the alkali tank. The third temperature transmitter 16 is also used to detect the third temperature at the inlet of the electrolytic cell 100, i.e., the temperature of the liquid returning to the electrolytic cell 100. By using the second temperature transmitter 15 and the third temperature transmitter 16, the collected second and third temperatures can be used to compensate for the first temperature, thereby avoiding any lag that may exist in the first temperature reading.

[0080] In practice, the opening of the circulating water regulating valve 14 can be adjusted according to the first temperature at the outlet of the gas-liquid mixture discharged from the electrolytic cell 100, the second temperature of the liquid returning from the outlet of the alkali mixing tank, and the third temperature of the liquid at the return port of the electrolytic cell 100. This allows the amount of liquid returning to the electrolytic cell 100 at a lower temperature to more accurately maintain the liquid temperature in the electrolytic cell 100 at the temperature required during the electrolysis process.

[0081] The cooling circuit also includes: a second cooling branch and a third cooling branch;

[0082] The second cooling branch is connected to the gas cooling structure 7 inside the hydrogen-alkali vertical gas-liquid separator 1.

[0083] The third cooling branch is connected to the gas cooling structure 7 inside the oxygen-alkali vertical gas-liquid separator 2.

[0084] It should be understood that during the gas-liquid separation process, not only does the liquid in the alkali preparation tank need to be cooled, but the washed hydrogen or oxygen also needs to be cooled. Usually, an additional cooling circuit needs to be set up and connected to the gas cooling structure 7.

[0085] It should be noted that the cooling circuit in this embodiment includes multiple cooling branches, which are connected to a main circuit, thus eliminating the need to provide a complete cooling circuit for each corresponding device. The second cooling branch is used to provide condensate to the gas cooling structure 7 in the hydrogen-alkali vertical gas-liquid separator 1, and the third cooling branch is used to provide condensate to the gas cooling structure 7 in the oxygen-alkali vertical gas-liquid separator 2.

[0086] Furthermore, in this embodiment, the gas-liquid separation system also includes: an alkali replenishment pump 17;

[0087] The alkali replenishment pump 17 is installed on the alkali return pipeline connected to the alkali return port of the electrolytic cell 100, and is used to regulate the alkali returning to the electrolytic cell 100.

[0088] It should be understood that during the electrolysis process, an alkali replenishment pump 17 and an alkali circulation pump are typically required within the electrolysis system. The main function of the alkali replenishment pump 17 is to replenish the alkali solution in the electrolyzer 100, ensuring that the pH value within the electrolyzer 100 remains within the set range. During the electrolysis of water to produce hydrogen, the alkali replenishment pump 17 injects an appropriate amount of alkali solution into the electrolyzer 100 to regulate the acid-base balance of the system and prevent the system from being affected by acid-base imbalance, thus ensuring normal operation. The alkali circulation pump increases the pressure of the alkali solution, maintaining it at a suitable flow rate in the alkali return pipeline, thereby carrying away the gas and heat generated during electrolysis and promoting the stirring of the electrolyte. In addition, the alkali circulation pump can also reduce the gas content in the alkali solution, reduce the voltage in the small chamber, and thus reduce energy consumption. The stable operation of the alkali circulation pump is crucial for the smooth progress of the electrolysis process and the efficient production of hydrogen.

[0089] In this embodiment, by setting the alkali replenishment pump 17 on the alkali return pipeline connected to the alkali return port of the electrolytic cell 100, it is possible to replenish the alkali in the alkali preparation tank to the electrolytic cell 100 and control the flow rate of alkali return during electrolysis. This eliminates the need to set up an additional alkali circulation pump in the electrolysis system, thereby further reducing the number of devices in the gas-liquid separation system and reducing the overall size of the gas-liquid separation system.

[0090] Reference Figure 4 , Figure 4 This is a schematic diagram of the third embodiment of the gas-liquid separation system proposed in this application. Based on the first or second embodiment of the gas-liquid separation system described above, a third embodiment of the gas-liquid separation system of this application is proposed.

[0091] In this embodiment, a third level gauge 18 is provided on one side of the hydrogen-alkali vertical gas-liquid separator 1, and a first level regulating valve 19 is provided on the alkali pipeline between the hydrogen-alkali vertical gas-liquid separator 1 and the first alkali mixing tank 3; the setting parameters of the opening degree of the first level regulating valve 19 include: the liquid level height in the hydrogen-alkali vertical gas-liquid separator 1 detected by the third level gauge 18.

[0092] A fourth level gauge 20 is installed on one side of the oxygen-alkali vertical gas-liquid separator 2, and a second level regulating valve 21 is installed on the alkali pipeline between the oxygen-alkali vertical gas-liquid separator 2 and the second alkali mixing tank 4; the setting parameters of the opening degree of the second level regulating valve 21 include: the liquid level height in the oxygen-alkali vertical gas-liquid separator 2 detected by the fourth level gauge 20.

[0093] It should be understood that the alkaline solution separated by the gas-liquid separation structure 5 flows from the first liquid outlet of the hydrogen-alkali vertical gas-liquid separator 1 and the second liquid outlet of the oxygen-alkali vertical gas-liquid separator 2 to the corresponding first alkali mixing tank 3 and second alkali mixing tank 4. If there is a large amount of liquid in the hydrogen-alkali vertical gas-liquid separator 1 or the oxygen-alkali vertical gas-liquid separator 2, a large amount will flow back to the corresponding alkali mixing tank, and then back into the electrolytic cell 100, causing the liquid level in the electrolytic cell 100 to be unstable, which will affect the electrolysis process.

[0094] It should be noted that the third level gauge 18 is used to detect the liquid level in the hydrogen-alkali vertical gas-liquid separator 1; the fourth level gauge 20 is used to detect the liquid level in the oxygen-alkali vertical gas-liquid separator 2. The first level regulating valve 19 is used to regulate the flow rate of liquid returning to the first alkali mixing tank 3; the larger the opening of the first level regulating valve 19, the larger the flow rate of liquid returning to the first alkali mixing tank 3. Similarly, the second level regulating valve 21 is used to regulate the flow rate of liquid returning to the second alkali mixing tank 4; the larger the opening of the second level regulating valve 21, the larger the flow rate of liquid returning to the second alkali mixing tank 4.

[0095] In this embodiment, the specific opening degree of the first liquid level regulating valve 19 can be set according to the liquid level height detected by the third liquid level gauge 18 in the hydrogen-alkali vertical gas-liquid separator 1. The higher the liquid level height, the larger the opening degree of the first liquid level regulating valve 19 is controlled, thereby stabilizing the liquid level height in the hydrogen-alkali vertical gas-liquid separator 1. The specific opening degree of the second liquid level regulating valve 21 can be set according to the liquid level height detected by the fourth liquid level gauge 20 in the oxygen-alkali vertical gas-liquid separator 2. The higher the liquid level height, the larger the opening degree of the second liquid level regulating valve 21 is controlled, thereby stabilizing the liquid level height in the oxygen-alkali vertical gas-liquid separator 2. When the liquid levels of both the hydrogen-alkali vertical gas-liquid separator 1 and the oxygen-alkali vertical gas-liquid separator 2 are stable, the liquid level returning to the electrolytic cell 100 through the alkali mixing tank can be stabilized, preventing excessive or insufficient alkali solution from returning to the electrolytic cell 100 and affecting the electrolysis process.

[0096] Reference Figure 5 , Figure 5 This is a schematic diagram of the fourth embodiment of the gas-liquid separation system proposed in this application. The fourth embodiment of the gas-liquid separation system of this application is proposed based on any of the above embodiments of the gas-liquid separation system.

[0097] In this embodiment, a pressure transmitter 22 and a pressure regulating valve 23 are installed at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator 2.

[0098] Pressure transmitter 22 is used to detect the pressure value at the oxygen outlet of oxygen-alkali vertical gas-liquid separator 2;

[0099] The pressure regulating valve 23 is used to regulate the outlet opening of the oxygen-alkali vertical gas-liquid separator 2. The setting parameters for the opening of the pressure regulating valve 23 include the pressure value at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator 2.

[0100] It should be understood that during the gas-liquid separation process, hydrogen and oxygen are generated and discharged. During this process, the pressure values ​​in the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1 will change, causing the pressure in the gas-liquid separation system to be unstable at the pressure value required for the normal gas-liquid separation process, thereby affecting the gas-liquid separation process.

[0101] It should be noted that the pressure transmitter 22 is a device used to detect the pressure value on one side of the oxygen-alkali vertical gas-liquid separator 2 during the gas-liquid separation process. This pressure transmitter 22 can be a pressure sensor. The pressure regulating valve 23 is a valve used to adjust the pressure value on one side of the oxygen-alkali vertical gas-liquid separator 2. This valve 23 can adjust its opening to control the amount of oxygen discharged from the oxygen-alkali vertical gas-liquid separator 2, thereby regulating the pressure value inside the separator 2. For example, if the pressure value at the outlet of the oxygen-alkali vertical gas-liquid separator 2 is high, the opening of the pressure regulating valve 23 can be appropriately increased to allow more oxygen to be discharged from the separator 2, thus reducing the pressure value inside the separator 2.

[0102] In practical implementation, the pressure value at the outlet of the oxygen-alkali vertical gas-liquid separator 2 can be detected by the pressure transmitter 22. The detected pressure value is compared with the pressure value required for the normal gas-liquid separation process. If the detected pressure value is greater than the pressure value required for the normal gas-liquid separation process, the opening of the pressure regulating valve 23 can be appropriately increased; if the detected pressure value is less than the pressure value required for the normal gas-liquid separation process, the opening of the pressure regulating valve 23 can be appropriately decreased, thereby maintaining the stability of the pressure value in the gas-liquid separation system.

[0103] A differential pressure gauge 24 is also installed between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1 to detect the pressure difference between them.

[0104] A differential pressure regulating valve 25 is installed at the hydrogen outlet of the hydrogen-alkali vertical gas-liquid separator 1 to regulate the pressure difference.

[0105] It is understandable that during electrolysis, the amount of hydrogen produced is not the same as the amount of oxygen, with hydrogen being greater than oxygen. During prolonged electrolysis, the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1 may become unbalanced, leading to a situation where gas cannot be generated or discharged normally.

[0106] It should be noted that the differential pressure gauge 24 is a device used to detect the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1. This device is installed between and connected to both the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1. The pressure difference between the gases on both sides at the differential pressure gauge 24 is the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1. The differential pressure regulating valve 25 is a valve used to regulate the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1. This differential pressure regulating valve 25 can control the amount of hydrogen gas discharged from one side of the hydrogen-alkali vertical gas-liquid separator 1. By controlling the amount of hydrogen gas inside the hydrogen-alkali vertical gas-liquid separator 1, the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1 can be regulated.

[0107] In practical implementation, the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1 can be detected by the differential pressure gauge 24. When the pressure difference is greater than the set pressure difference during normal gas-liquid separation, the opening of the differential pressure regulating valve 25 is increased to increase the amount of hydrogen discharged from the hydrogen-alkali vertical gas-liquid separator 1, thereby reducing the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1. Conversely, when the pressure difference is less than the set pressure difference during normal gas-liquid separation, the opening of the differential pressure regulating valve 25 is decreased to reduce the amount of hydrogen discharged from the hydrogen-alkali vertical gas-liquid separator 1, thereby increasing the pressure difference between the oxygen-alkali vertical gas-liquid separator 2 and the hydrogen-alkali vertical gas-liquid separator 1.

[0108] In addition, to achieve the above objectives, this application also provides an electrolysis system, which includes an electrolytic cell and a gas-liquid separation system of any of the above embodiments.

[0109] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A gas-liquid separation system, characterized in that, Includes: a hydrogen-alkali vertical gas-liquid separator, an oxygen-alkali vertical gas-liquid separator, a first alkali mixing tank, and a second alkali mixing tank; The inlet of the hydrogen-alkali vertical gas-liquid separator and the inlet of the oxygen-alkali vertical gas-liquid separator are both connected to the electrolytic cell. The top of the hydrogen-alkali vertical gas-liquid separator is provided with a hydrogen outlet, and the top of the oxygen-alkali vertical gas-liquid separator is provided with an oxygen outlet. The bottom end of the hydrogen-alkali vertical gas-liquid separator is provided with a first liquid outlet, which is connected to the electrolytic cell through the first alkali mixing tank; the bottom end of the oxygen-alkali vertical gas-liquid separator is provided with a second liquid outlet, which is connected to the electrolytic cell through the second alkali mixing tank. Both the hydrogen-alkali vertical gas-liquid separator and the oxygen-alkali vertical gas-liquid separator are equipped with a gas-liquid separation structure, a gas washing structure, a gas cooling structure, and a gas-water separation structure from bottom to top. The pressure in the first alkali mixing tank is lower than the pressure in the hydrogen-alkali vertical gas-liquid separator, and is used to flash evaporate the alkali solution flowing out of the first liquid outlet; and / or, the pressure in the second alkali mixing tank is lower than the pressure in the oxygen-alkali vertical gas-liquid separator, and is used to flash evaporate the alkali solution flowing out of the second liquid outlet.

2. The gas-liquid separation system as described in claim 1, characterized in that, Each of the gas washing structures on the vertical hydrogen-alkali gas-liquid separator is equipped with a first water supply switch valve, and a first level gauge is installed on one side of the first alkali preparation tank; the opening parameters of the first water supply switch valve include: the liquid level height in the first alkali preparation tank detected by the first level gauge; and / or, A second water supply switch valve is provided at the gas washing structure position on the oxygen-alkali vertical gas-liquid separator, and a second liquid level gauge is provided on one side of the second alkali tank; the setting parameters of the opening degree of the second water supply switch valve include: the liquid level height in the second alkali tank detected by the second liquid level gauge.

3. The gas-liquid separation system as described in claim 2, characterized in that, The gas-liquid separation system also includes: a cooling circuit and a first temperature transmitter; The first temperature transmitter is located at the outlet of the electrolytic cell and is used to detect the first temperature at the outlet of the electrolytic cell. Both the first and second alkali mixing tanks are equipped with heat exchangers, which are connected to the first cooling branch of the cooling circuit. A circulating water regulating valve is installed on the first cooling branch. The setting parameters for the opening of the circulating water regulating valve include the first temperature.

4. The gas-liquid separation system as described in claim 3, characterized in that, The gas-liquid separation system further includes: a second temperature transmitter and a third temperature transmitter; The second temperature transmitter is located at the junction of the alkali return pipelines of the first alkali tank and the second alkali tank, and is used to detect the second temperature at the junction of the alkali return pipelines. The third temperature transmitter is installed at the outlet of the alkali return pipeline and is used to detect the third temperature at the outlet of the alkali return pipeline. The setting parameters for the opening degree of the circulating water regulating valve also include: the second temperature and the third temperature.

5. The gas-liquid separation system as described in claim 3, characterized in that, The cooling circuit further includes: a second cooling branch and a third cooling branch; The second cooling branch is connected to the gas cooling structure inside the hydrogen-alkali vertical gas-liquid separator; The third cooling branch is connected to the gas cooling structure inside the oxygen-alkali vertical gas-liquid separator.

6. The gas-liquid separation system as described in claim 1, characterized in that, A third level gauge is installed on one side of the vertical hydrogen-alkali gas-liquid separator, and a first level regulating valve is installed on the alkali pipeline between the vertical hydrogen-alkali gas-liquid separator and the first alkali mixing tank; the opening parameters of the first level regulating valve include: the liquid level height in the vertical hydrogen-alkali gas-liquid separator detected by the third level gauge; and / or, A fourth level gauge is installed on one side of the oxygen-alkali vertical gas-liquid separator, and a second level regulating valve is installed on the alkali pipeline between the oxygen-alkali vertical gas-liquid separator and the second alkali mixing tank; the setting parameters for the opening of the second level regulating valve include: the liquid level height in the oxygen-alkali vertical gas-liquid separator detected by the fourth level gauge.

7. The gas-liquid separation system as described in claim 1, characterized in that, The oxygen outlet of the oxygen-alkali vertical gas-liquid separator is equipped with a pressure transmitter and a pressure regulating valve. The pressure transmitter is used to detect the pressure value at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator. The pressure regulating valve is used to adjust the outlet opening of the oxygen-alkali vertical gas-liquid separator. The setting parameters for the opening of the pressure regulating valve include the pressure value at the oxygen outlet of the oxygen-alkali vertical gas-liquid separator.

8. The gas-liquid separation system as described in claim 7, characterized in that, A differential pressure gauge is also installed between the oxygen-alkali vertical gas-liquid separator and the hydrogen-alkali vertical gas-liquid separator to detect the pressure difference between them. The hydrogen outlet of the vertical hydrogen-alkali gas-liquid separator is equipped with a differential pressure regulating valve to adjust the pressure difference.

9. The gas-liquid separation system according to any one of claims 1 to 8, characterized in that, The gas-liquid separation system also includes: an alkali replenishment pump; The alkali replenishment pump is installed on the alkali return pipeline connected to the alkali return port of the electrolytic cell, and is used to regulate the alkali returning to the electrolytic cell.

10. An electrolysis system, characterized in that, The electrolysis system includes: an electrolytic cell and a gas-liquid separation system as described in any one of claims 1 to 9.

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