Electrolysis system

Abstract

The utility model relates to an electrolysis system which comprises an electrolysis device, a gas-liquid separation assembly and a waste heat utilization system, the electrolysis device is provided with an inlet and an outlet, the gas-liquid separation assembly is arranged at the outlet of the electrolysis device, and the gas-liquid separation assembly is used for separating an electrolyte with a first temperature from the outlet; the waste heat utilization system comprises a plurality of waste heat utilization devices which are connected, the waste heat utilization devices are matched with one another and connected with the gas-liquid separation assembly and the inlet to form a first electrolyte flow channel, and the waste heat utilization system is configured to conduct heat exchange on an electrolyte at the first temperature through the first electrolyte flow channel to form an electrolyte at the second temperature. The second temperature is less than the first temperature. According to the electrolysis system in the embodiment of the invention, heat energy in the electrolyte can be efficiently utilized while cooling of the electrolyte is achieved, the energy utilization efficiency of the whole electrolysis system is improved, and overall energy consumption and water consumption are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of water electrolysis, and in particular to an electrolysis system. Background Art

[0002] In recent years, as the cost of renewable energy has gradually decreased, the demand for hydrogen production from renewable energy has increased significantly. Electrolysis devices are the core equipment for converting electricity into hydrogen and are being used more and more widely.

[0003] In the current electrolysis system, an alkali liquid cooler needs to be set up to cool the electrolyte at the outlet of the electrolysis device through cooling water to meet the recycling needs of the electrolyte. However, for large-scale electrolysis hydrogen production projects, the number of electrolysis devices required is large, resulting in a large amount of cooling water required to meet the cooling needs of the electrolyte. The above cooling method not only increases water and electricity consumption, but also loses the heat of the electrolyte, reducing the energy utilization efficiency of the entire system. Utility Model Content

[0004] The embodiment of the present application provides an electrolysis system that can efficiently utilize the heat energy in the electrolyte, improve the energy utilization efficiency of the entire electrolysis system, and reduce overall energy consumption and water consumption.

[0005] On the one hand, according to an embodiment of the present application, an electrolysis system is proposed, including: an electrolysis device having an inlet and an outlet; a gas-liquid separation component arranged at the outlet of the electrolysis device, the gas-liquid separation component being used to separate an electrolyte having a first temperature from the outlet; a waste heat utilization system, including a plurality of connected waste heat utilization devices, the plurality of waste heat utilization devices cooperate with each other and are connected to the gas-liquid separation component and the inlet to form a first electrolyte flow channel, the waste heat utilization system is configured to exchange heat from the electrolyte at the first temperature through the first electrolyte flow channel to form an electrolyte at a second temperature, the second temperature being lower than the first temperature.

[0006] According to one aspect of an embodiment of the present application, the waste heat utilization device has a first heat exchange channel and a second heat exchange channel; the first heat exchange channels of each waste heat utilization device are interconnected and connected to the gas-liquid separation component and the inlet to form a first electrolyte flow channel, and the second heat exchange channel is used to input the first heat exchange medium to utilize the electrolyte in the first electrolyte flow channel to achieve cooling or heating of the first heat exchange medium.

[0007] According to one aspect of an embodiment of the present application, the first heat exchange channels of a plurality of waste heat utilization devices are connected in parallel.

[0008] According to one aspect of an embodiment of the present application, the plurality of waste heat utilization devices include at least one of a low-temperature absorption refrigeration unit and a low-temperature absorption heating unit.

[0009] According to one aspect of an embodiment of the present application, the electrolysis system also includes a heat exchanger, which includes a third heat exchange channel and a fourth heat exchange channel; the third heat exchange channel is connected to the gas-liquid separation component and the inlet to form a second electrolyte flow channel, the first electrolyte flow channel and the second electrolyte flow channel are interconnected, and the fourth heat exchange channel is used to input a second heat exchange medium to perform heat exchange with the electrolyte in the second electrolyte flow channel through the second heat exchange medium.

[0010] According to one aspect of an embodiment of the present application, the third heat exchange channel of the heat exchanger and the first electrolyte flow channel are connected in parallel.

[0011] According to one aspect of an embodiment of the present application, the number of heat exchangers is more than two, and the fourth heat exchange channel of at least one heat exchanger is connected to the second heat exchange channel of one of the waste heat utilization devices.

[0012] According to one aspect of an embodiment of the present application, the number of electrolysis devices is more than two, the number of gas-liquid separation components is less than or equal to the number of electrolysis devices, and the outlets of more than two electrolysis devices are connected to the waste heat utilization system through the corresponding gas-liquid separation components after converging.

[0013] According to one aspect of an embodiment of the present application, the electrolysis system also includes a heating device, which is arranged at the inlet of the electrolysis device; the heating device includes a storage chamber and a heating pipeline, the output end of the first electrolyte flow channel is connected to the inlet of the electrolysis device through the storage chamber, and the heating pipeline is used to heat the electrolyte in the storage chamber to a preset temperature.

[0014] According to one aspect of an embodiment of the present application, the output end of the gas-liquid separation component includes a first branch and a second branch, the first branch is connected to the storage chamber, and the second branch is connected to the waste heat utilization system; the electrolysis system also includes a control valve, which is connected to the output end of the gas-liquid separation component and selectively controls one of the first branch and the second branch to be connected.

[0015] The electrolysis system provided in the embodiment of the present application includes an electrolysis device, a gas-liquid separation component and a waste heat utilization system. The gas-liquid separation component is used to separate an electrolyte having a first temperature from a fluid medium at an outlet of the electrolysis device. The waste heat utilization device includes a plurality of connected waste heat utilization devices. The electrolyte at the first temperature is configured to be injected into a first electrolyte flow channel formed by the plurality of waste heat utilization devices so as to pass through the plurality of waste heat utilization devices, and at the same time, efficiently utilize the heat energy in the electrolyte while cooling the electrolyte to a second temperature, so as to be used for the production needs of other equipment, thereby improving the energy utilization efficiency of the electrolysis system and reducing the overall energy consumption and water consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of an electrolysis system provided in an embodiment of the present application;

[0018] Figure 2 It is a structural schematic diagram of a low-temperature absorption refrigeration unit provided in an embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of a low-temperature absorption heating unit provided in an embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the structure of another electrolysis system provided in an embodiment of the present application.

[0021] in:

[0022] 10-Electrolysis system;

[0023] 1-electrolysis device; 2-gas-liquid separation component; 21-first branch; 22-second branch; 3-waste heat utilization equipment; 31-first heat exchange channel; 32-second heat exchange channel; 4-heat exchanger; 41-third heat exchange channel; 42-fourth heat exchange channel; 5-heating equipment;

[0024] 3a- low temperature absorption refrigeration unit; 31a- generator; 32a- condenser; 33a- absorber; 34a- evaporator; 3b- low temperature absorption heating unit; 31b- generator; 32b- condenser; 33b- absorber; 34b- evaporator.

[0025] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least the known structures and technologies of the region are not shown in order to avoid unnecessary ambiguity to the present application; and, for clarity, the size of the regional structure may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0027] The directional words appearing in the following description are all directions shown in the figure, and do not limit the specific structure of the electrolysis system of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the process of producing hydrogen by electrolysis of water, the electrolyte needs to be continuously injected into the electrolysis device, the inlet temperature of the electrolyte injected into the electrolysis device is about 55°C-65°C, and the outlet temperature of the electrolyte flowing out of the electrolysis device is about 85°C-95°C. In the existing electrolysis system, the electrolyte needs to be input into the alkali liquid cooler, where the electrolyte is cooled to 55°C-65°C by heat exchange with cooling water, and then sent back to the electrolysis device for recycling.

[0029] Among them, each ton of electrolyte requires 2-3 tons of cooling water for cooling. 3 / h hydrogen electrolysis device as an example, the heat load of the alkali solution cooler is about 1750kwh, and the heat taken away by the electrolyte accounts for about 35% of the power consumption of the electrolysis device, requiring 120m 3 / h-180m 3 / h of cooling water for cooling.

[0030] In response to the current demand for green energy development, a large number of electrolysis devices need to be installed for wind power generation and hydrogen production. Often, dozens or even hundreds of electrolysis devices need to be installed, with a single set capacity of at least 1000Nm 3 / h hydrogen electrolysis device. The above number of electrolysis devices requires a large amount of cooling water to meet the cooling demand of the electrolyte, and also needs to bear the corresponding increase in material and electricity consumption due to the increase in cooling water, which not only increases the cost, but also loses the heat of the electrolyte, reducing the energy utilization efficiency of the entire system.

[0031] In order to solve the above problems, the present application embodiment provides a new electrolysis system. Figures 1 to 4 The electrolysis system 10 according to the embodiment of the present application is described in detail.

[0032] See also Figure 1According to an embodiment of the present application, an electrolysis system 10 is proposed, including an electrolysis device 1, a gas-liquid separation component 2 and a waste heat utilization system, the electrolysis device 1 has an inlet and an outlet, the gas-liquid separation component 2 is arranged at the outlet of the electrolysis device 1, the gas-liquid separation component 2 is used to separate an electrolyte with a first temperature from the outlet, the waste heat utilization system includes a plurality of connected waste heat utilization devices 3, the plurality of waste heat utilization devices 3 cooperate with each other and are connected to the gas-liquid separation component 2 and the inlet to form a first electrolyte flow channel, the waste heat utilization system is configured to exchange heat from the electrolyte at the first temperature through the first electrolyte flow channel to form an electrolyte at a second temperature, and the second temperature is lower than the first temperature.

[0033] The electrolysis system 10 in the embodiment of the present application includes an electrolysis device 1, a gas-liquid separation component 2 and a waste heat utilization system. The gas-liquid separation component 2 is used to separate an electrolyte having a first temperature from the fluid medium at the outlet of the electrolysis device 1. The waste heat utilization device 3 includes a plurality of connected waste heat utilization devices 3. The electrolyte at the first temperature is configured to be injected into a first electrolyte flow channel formed by the plurality of waste heat utilization devices 3 so as to pass through the plurality of waste heat utilization devices 3. While cooling the electrolyte to a second temperature, the heat energy in the electrolyte is efficiently utilized for production needs of other equipment, thereby improving the energy utilization efficiency of the electrolysis system 10 and reducing overall energy consumption and water consumption.

[0034] It can be understood that the waste heat utilization device 3 can be set to any existing waste heat utilization device 3. As an example, the waste heat utilization device 3 can be set to a waste heat power generation device to achieve waste heat utilization by converting the thermal energy of the electrolyte into electrical energy. Alternatively, the waste heat utilization device 3 can also be set to a waste heat exchange device to achieve waste heat utilization by converting the thermal energy of the electrolyte into the thermal energy of other heat exchange media.

[0035] Optionally, the specific number of waste heat utilization devices 3 can also be adjusted according to actual needs, and this application does not make any specific restrictions on this.

[0036] When the waste heat utilization device 3 is set as a waste heat exchange device, in some optional embodiments, the waste heat utilization device 3 has a first heat exchange channel 31 and a second heat exchange channel 32. The first heat exchange channels 31 of each waste heat utilization device 3 are interconnected and connected to the gas-liquid separation component 2 and the inlet to form a first electrolyte flow channel. The second heat exchange channel 32 is used to input the first heat exchange medium to utilize the electrolyte in the first electrolyte flow channel to achieve cooling or heating of the first heat exchange medium.

[0037] Specifically, each waste heat utilization device 3 has a first heat exchange channel 31 and a second heat exchange channel 32. The first heat exchange channel 31 is used to input electrolyte. The first heat exchange channels 31 of each waste heat utilization device 3 are interconnected to form a first electrolyte flow channel. The second heat exchange channel 32 is used to input the first heat exchange medium to transfer the heat of the electrolyte to the waste heat utilization device 3, and to achieve cooling or heating of the first heat exchange medium, so that the first heat exchange medium can be transferred to other equipment for production needs of other equipment to achieve waste heat utilization.

[0038] It should be noted that the first heat exchange medium is not used to limit a specific heat exchange medium, but refers to the heat exchange medium that uses the heat of the electrolyte in the waste heat utilization device 3 to achieve cooling or heating. Among the multiple waste heat utilization devices 3, the first heat exchange mediums of at least two waste heat utilization devices 3 may be different, or the first heat exchange mediums of at least two waste heat utilization devices 3 may be the same.

[0039] In some optional embodiments, the first heat exchange channels 31 of the plurality of waste heat utilization devices 3 are connected in parallel. That is, the electrolyte at the first temperature separated by the gas-liquid separation component 2 is divided and enters the first heat exchange channel 31 of each waste heat utilization device 3 respectively, and after heat exchange with the first heat exchange medium of the second heat exchange channel 32 respectively, they converge to form the electrolyte at the second temperature.

[0040] By connecting the first heat exchange channels 31 of multiple waste heat utilization devices 3 in parallel, on the one hand, the inlet temperature of the first heat exchange channel 31 of each waste heat utilization device 3 can be consistent, and the electrolyte is the first temperature, which improves the heat utilization effect and facilitates cooling or heating the first heat exchange medium to a predetermined temperature range. On the other hand, when any waste heat utilization device 3 is shut down or fails, the circulation of the first electrolyte flow channel will not be affected, thereby improving the reliability of the electrolysis system 10.

[0041] Of course, the first heat exchange channels 31 of the multiple waste heat utilization devices 3 can also be connected in series, or, among the multiple waste heat utilization devices 3, the first heat exchange channels 31 of some of the waste heat utilization devices 3 are connected in series, and the first heat exchange channels 31 of some of the waste heat utilization devices 3 are connected in parallel. According to actual use requirements, the connection mode of the multiple waste heat utilization devices 3 is adjusted so that the first heat exchange channels 31 of the multiple waste heat utilization devices 3 can be connected to form a first electrolyte flow channel to achieve heat exchange of the electrolyte.

[0042] In some optional embodiments, the plurality of waste heat utilization devices 3 include at least one of a low-temperature absorption refrigeration unit 3a and a low-temperature absorption heating unit 3b.

[0043] See also Figure 2When the waste heat utilization device 3 is set as a low-temperature absorption refrigeration unit 3a, the first heat exchange medium can be set as chilled water.

[0044] Taking the low-temperature absorption refrigeration unit 3a as an example, the low-temperature absorption refrigeration unit 3a includes a generator 31a, a condenser 32a, an absorber 33a and an evaporator 34a. The generator 31a and the condenser 32a have a higher pressure and are arranged in one cylinder, called a high-pressure cylinder. The absorber 33a and the evaporator 34a have a lower pressure and are arranged in another cylinder, called a low-pressure cylinder. The high-pressure cylinder and the low-pressure cylinder are connected by a throttling device U-shaped tube to maintain the pressure difference between the two cylinders.

[0045] The cycle process is as follows: the dilute solution in the absorber 33a is sent to the generator 31a by the pump body, the first heat exchange channel 31 is set in the generator 31a, the dilute solution is heated by the electrolyte and vaporizes water vapor, enters the condenser 32a and is condensed into high-pressure and low-temperature liquid water, and flows into the evaporator 34a through the U-shaped tube. The second heat exchange channel 32 is set in the evaporator 34a, and the liquid water flowing into the evaporator 34a expands rapidly and vaporizes, and absorbs a large amount of heat from the chilled water in the second heat exchange channel 32 during the vaporization process, so that the temperature of the chilled water is reduced, thereby achieving the purpose of cooling and refrigeration. At the same time, the liquid water itself becomes water vapor, enters the absorber 33a, is absorbed by the concentrated solution and becomes a dilute solution, and the cycle is endless, achieving the purpose of continuous refrigeration.

[0046] By setting the waste heat utilization device 3 as a low-temperature absorption refrigeration unit 3a, the heat of the electrolyte can be used to prepare chilled water, so as to cool the chilled water while cooling the electrolyte, and reduce the temperature of the chilled water to 5°C to 20°C. The chilled water can be used to cool and remove water from the hydrogen and oxygen separated by the gas-liquid separation component 2, thereby reducing the power consumption and water consumption for preparing chilled water.

[0047] See also Figure 3 When the waste heat utilization device 3 is set as a low-temperature absorption heating unit 3b, the first heat exchange medium can be set as factory heating water, desalted water, etc.

[0048] Taking the low-temperature absorption heating unit 3b as an example, the low-temperature absorption heating unit 3b includes an upper cylinder composed of an evaporator 34b and an absorber 33b and a lower cylinder composed of a condenser 32b and a generator 31b. When the low-temperature absorption heating unit 3b is working, the main body is in a vacuum state.

[0049] The cycle process is as follows: the first heat exchange channel 31 passes through the generator 31b and the evaporator 34b in sequence, the dilute solution in the generator 31b is heated and concentrated into a concentrated solution, the concentrated solution after the dilute solution in the generator 31b is heated and concentrated is transported into the absorber 33b through the pump body, and the refrigerant vapor generated at the same time enters the condenser 32b, is condensed into high-pressure and low-temperature liquid water, and is transported into the evaporator 34b through the pump body, absorbs the residual heat of the first heat exchange channel 31 in the evaporator 34b and evaporates, generating refrigerant vapor and entering the absorber 33b. At the same time, the second heat exchange channel 32 is set in the absorber 33b, the concentrated solution after the dilute solution in the generator 31b is heated and concentrated absorbs the refrigerant vapor to become a dilute solution and generates absorption heat, the first heat exchange medium in the second heat exchange channel 32 absorbs the above absorption heat, thereby achieving the purpose of heating and cooling, and at the same time the dilute solution in the absorber 33b flows back to the generator 31b, and the cycle is endless, achieving the purpose of continuous heating.

[0050] By setting the waste heat utilization device 3 as a low-temperature absorption heating unit 3b, the heat of the electrolyte can be used to heat the heating water or desalted water. The heated heating water can be used for heating factory buildings and office areas, or can be used as hot water for other equipment, pipelines and instruments, etc., to reduce heating energy consumption. The heated desalted water can be used to supply the deaerator to prepare deoxygenated water or boiler feed water through the deaerator, thereby reducing the energy consumption of factory steam production.

[0051] It can be understood that, taking the first temperature of 85°C-95°C as an example, by setting up sufficient waste heat utilization equipment 3, the electrolyte at the first temperature can be cooled to 55°C-65°C, that is, the second temperature reaches 55°C-65°C, so that the electrolyte can be directly sent back to the inlet of the electrolysis device 1 to achieve the recycling of the electrolyte.

[0052] See also Figures 1 to 3 To further ensure that the electrolyte can be cooled to 55°C-65°C, in some optional embodiments, the electrolysis system 10 further includes a heat exchanger 4, the heat exchanger 4 includes a third heat exchange channel 41 and a fourth heat exchange channel 42, the third heat exchange channel 41 is connected to the gas-liquid separation component 2 and the inlet to form a second electrolyte flow channel, the first electrolyte flow channel and the second electrolyte flow channel are interconnected, and the fourth heat exchange channel 42 is used to input a second heat exchange medium to perform heat exchange with the electrolyte in the second electrolyte flow channel through the second heat exchange medium.

[0053] Optionally, the second heat exchange medium may be cooling water.

[0054] By setting up the heat exchanger 4, the heat exchanger 4 can be used as a guarantee measure to cool the electrolyte, so that when the heat exchange load fluctuates in the waste heat utilization system, the heat exchanger 4 can be used to ensure that the electrolyte can be cooled to 55°C-65°C to be input into the inlet of the electrolysis device 1, thereby realizing the recycling of the electrolyte.

[0055] In some optional embodiments, the third heat exchange channel 41 of the heat exchanger 4 is connected in parallel with the first electrolyte flow channel, that is, the third heat exchange channel 41 and the first electrolyte flow channel do not affect each other, so that when any waste heat utilization device 3 is shut down or fails, the flow of the third heat exchange channel 41 will not be affected, thereby improving the reliability of the electrolysis system 10.

[0056] In other embodiments, the third heat exchange channel of the heat exchanger 4 may also be connected in series with the first electrolyte channel, and the heat exchanger 4 is connected between the waste heat utilization system and the inlet of the electrolysis device 1, so that after the electrolyte absorbs heat and is cooled by the waste heat utilization system, it can exchange heat with the heat exchanger 4, which makes it easier to control the temperature of the electrolyte through the heat exchanger 4 so that it can be stably cooled to 55°C-65°C.

[0057] Of course, in some other embodiments, the heat exchanger 4 may also be connected in series with only part of the waste heat utilization equipment 3 in the waste heat utilization system. According to actual use requirements, the connection mode of the heat exchanger 4 and the plurality of waste heat utilization equipment 3 is adjusted, that is, the heat exchanger 4 can be used to ensure the temperature of the electrolyte entering the inlet of the electrolysis device 1.

[0058] In some optional embodiments, the number of the heat exchangers 4 is more than two, and the fourth heat exchange channel 42 of at least one heat exchanger 4 is connected to the second heat exchange channel 32 of one of the waste heat utilization devices 3 .

[0059] When the number of heat exchangers 4 is more than two, part of the heat exchangers 4 can also be reused as the waste heat utilization device 3, for example, the first heat exchange medium can be reused as the second heat exchange medium. As an example, desalted water can be injected into the fourth heat exchange channel 42 of the heat exchanger 4. After the desalted water and the electrolyte are heat exchanged in the heat exchanger 4, the desalted water is prepared to form preheated desalted water, and its temperature is about lower than 80°C. Then, the preheated desalted water is injected into the second heat exchange channel 32 of the waste heat utilization device 3, and heat is absorbed in the second heat exchange channel 32 to prepare hot desalted water with a higher temperature, and its temperature can be higher than 90°C, so that the hot desalted water with a higher temperature can be used for the deaerator to prepare deoxygenated water or boiler feed water, thereby reducing the energy consumption of steam production in the factory.

[0060] As an optional embodiment, the waste heat utilization system may include a low-temperature absorption refrigeration unit 3a and two low-temperature absorption heating units 3b arranged in parallel. The first heat exchange medium of the low-temperature absorption refrigeration unit 3a is set to chilled water, which is used for cooling and dehydrating the hydrogen and oxygen electrolyzed by the electrolysis device 1. Among the two low-temperature absorption heating units 3b, the first heat exchange medium of one is set to heating water, which is used to supply heating to factory buildings and office areas, and the first heat exchange medium of the other is set to desalted water, which is used for the deaerator to prepare deoxygenated water or boiler feed water.

[0061] Furthermore, the number of heat exchangers 4 can be set to two and connected in parallel with each waste heat utilization device 3 in the waste heat utilization system. Among the two heat exchangers 4, the second heat exchange medium of one heat exchanger 4 is set to cooling water as a guarantee measure to cool the electrolyte to 55°C-65°C, and the second heat exchange medium of the other heat exchanger 4 is set to desalted water, and is connected to the second heat exchange channel 32 of the low-temperature absorption heating unit 3b, that is, the desalted water and the electrolyte are heat-exchanged in the heat exchanger 4 to form preheated desalted water, and then the preheated desalted water is injected into the low-temperature absorption heating unit 3b as the first heat exchange medium to prepare hot desalted water with a higher temperature, thereby better meeting the deaerator preparation requirements.

[0062] It is understandable that, according to actual needs, the number of at least one of the low-temperature absorption refrigeration unit 3a, the low-temperature absorption heating unit 3b and the heat exchanger 4 can be additionally increased, and / or the arrangement of the low-temperature absorption refrigeration unit 3a, the low-temperature absorption heating unit 3b and the heat exchanger 4 can be adjusted to meet the cooling of the electrolyte and the utilization of waste heat.

[0063] See also Figure 4 In some optional embodiments, the number of electrolysis devices 1 is more than two, the number of gas-liquid separation components 2 is less than or equal to the number of electrolysis devices 1, and the outlets of more than two electrolysis devices 1 are connected to the waste heat utilization system through the corresponding gas-liquid separation components 2 after converging.

[0064] When multiple electrolysis devices 1 are provided, all of the electrolysis devices 1 can be divided into several groups, each group including 2 to 16 electrolysis devices 1, and the outlets of the multiple electrolysis devices 1 in each group share the same waste heat utilization system for cooling after the electrolyte is separated by the gas-liquid separation component 2, and then the cooled electrolyte is split and transported to the inlet of each electrolysis device 1. By having more than two electrolysis devices 1 share the same waste heat utilization system, the structure can be simplified and the cost can be reduced.

[0065] It can be understood that the number of gas-liquid separation components 2 may be less than the number of electrolysis devices 1, and the number of gas-liquid separation components 2 may also be equal to the number of electrolysis devices 1, that is, the gas-liquid separation components 2 are arranged one by one at the outlet end of the electrolysis device 1 to separate the electrolyte from the outlet of each electrolysis device 1 and input it into the waste heat utilization system after converging.

[0066] See also Figure 1 and Figure 4In some optional embodiments, the electrolysis system 10 also includes a heating device 5, which is arranged at the inlet of the electrolysis device 1. The heating device 5 includes a storage chamber and a heating pipeline. The output end of the first electrolyte flow channel is connected to the inlet of the electrolysis device 1 through the storage chamber, and the heating pipeline is used to heat the electrolyte in the storage chamber to a preset temperature.

[0067] By providing the heating device 5, when a certain electrolysis device 1 is in a non-powered standby state, the temperature of the electrolyte flowing through the electrolysis device 1 can be heated, so that the temperature of the electrolyte is maintained within a temperature range of 50°C to 65°C, so that the electrolysis device 1 is maintained in a hot standby state, thereby shortening the time interval from power-on startup to the rated hydrogen production load state of the electrolysis device 1, thereby increasing the response speed of the electrolysis device 1 to fluctuations in new energy such as wind and solar power generation, and reducing the abandonment rate of new energy power generation.

[0068] Optionally, the heating pipeline is steam heated to increase the heating speed.

[0069] In some optional embodiments, the output end of the gas-liquid separation component 2 includes a first branch 21 and a second branch 22, the first branch 21 is connected to the storage chamber, and the second branch 22 is connected to the waste heat utilization system; the electrolysis system 10 also includes a control valve, which is connected to the output end of the gas-liquid separation component 2, and selectively controls one of the first branch 21 and the second branch 22 to be connected.

[0070] By providing the first branch 21 and the second branch 22, when a certain electrolysis device 1 is in a non-powered standby state, the electrolyte at the output end of the gas-liquid separation component 2 corresponding to the electrolysis device 1 can enter the storage chamber through the first branch 21, and the electrolyte can circulate only between the storage chamber, the electrolysis device 1, and the gas-liquid separation component 2. When the electrolysis device 1 is in a powered state, the electrolyte at the output end of the gas-liquid separation component 2 corresponding to the electrolysis device 1 enters the waste heat utilization system through the second branch 22, thereby achieving the cooling of the electrolyte, ensuring that the temperature of the electrolyte entering the inlet of each electrolysis device 1 is maintained at 50°C to 65°C, and achieving the recycling of the electrolyte.

[0071] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrolysis system, characterized in that: include: An electrolysis device (1) having an inlet and an outlet; A gas-liquid separation component (2) is arranged at the outlet of the electrolysis device (1), and the gas-liquid separation component (2) is used to separate an electrolyte having a first temperature from the outlet; A waste heat utilization system comprises a plurality of connected waste heat utilization devices (3), wherein the plurality of waste heat utilization devices (3) cooperate with each other and are connected to the gas-liquid separation component (2) and the inlet to form a first electrolyte flow channel, and the waste heat utilization system is configured to exchange heat from an electrolyte at a first temperature to an electrolyte at a second temperature through the first electrolyte flow channel, wherein the second temperature is lower than the first temperature.

2. The electrolysis system according to claim 1, characterized in that: The waste heat utilization device (3) comprises a first heat exchange channel (31) and a second heat exchange channel (32); The first heat exchange channels (31) of each of the waste heat utilization devices (3) are interconnected and connected to the gas-liquid separation component (2) and the inlet to form the first electrolyte flow channel, and the second heat exchange channel (32) is used to input the first heat exchange medium to utilize the electrolyte in the first electrolyte flow channel to achieve cooling or heating of the first heat exchange medium.

3. The electrolysis system according to claim 2, characterized in that: The first heat exchange channels (31) of a plurality of the waste heat utilization devices (3) are connected in parallel.

4. The electrolysis system according to claim 2, characterized in that: The plurality of waste heat utilization devices (3) include at least one of a low-temperature absorption refrigeration unit (3a) and a low-temperature absorption heating unit (3b).

5. The electrolysis system according to any one of claims 2 to 4, characterized in that: The electrolysis system (10) further comprises a heat exchanger (4), wherein the heat exchanger (4) comprises a third heat exchange channel (41) and a fourth heat exchange channel (42); The third heat exchange channel (41) is connected to the gas-liquid separation component (2) and the inlet to form a second electrolyte flow channel, the first electrolyte flow channel and the second electrolyte flow channel are interconnected, and the fourth heat exchange channel (42) is used to input a second heat exchange medium to perform heat exchange with the electrolyte in the second electrolyte flow channel through the second heat exchange medium.

6. The electrolysis system according to claim 5, characterized in that: The third heat exchange channel (41) of the heat exchanger (4) and the first electrolyte flow channel are connected in parallel.

7. The electrolysis system according to claim 5, characterized in that The number of the heat exchangers (4) is more than two, and the fourth heat exchange channel (42) of at least one of the heat exchangers (4) is connected to the second heat exchange channel (32) of one of the waste heat utilization devices (3).

8. The electrolysis system according to any one of claims 1 to 4, characterized in that: The number of the electrolysis devices (1) is more than two, the number of the gas-liquid separation components (2) is less than or equal to the number of the electrolysis devices (1), and the outlets of more than two electrolysis devices (1) are connected to the waste heat utilization system through the corresponding gas-liquid separation components (2) after converging.

9. The electrolysis system according to any one of claims 1 to 4, characterized in that: The electrolysis system (10) further comprises a heating device (5), wherein the heating device (5) is arranged at the inlet of the electrolysis device (1); The heating device (5) comprises a storage chamber and a heating pipeline, the output end of the first electrolyte flow channel is connected to the inlet of the electrolysis device (1) through the storage chamber, and the heating pipeline is used to heat the electrolyte in the storage chamber to a preset temperature.

10. The electrolysis system according to claim 9, characterized in that: The output end of the gas-liquid separation component (2) comprises a first branch (21) and a second branch (22), the first branch (21) being connected to the storage chamber, and the second branch (22) being connected to the waste heat utilization system; The electrolysis system (10) further comprises a control valve, which is connected to the output end of the gas-liquid separation component (2) and selectively controls the communication between the first branch (21) and the second branch (22).

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