A heat exchange system for thermal management

Abstract

The present application proposes a thermal management circulating heat exchange system, comprising a circulating pipeline and an electrolytic hydrogen production device connected to the circulating pipeline, an energy storage water tank being arranged on the circulating pipeline, and an electric boiler being connected to the outside of the energy storage water tank through a pipeline, the electrolytic hydrogen production device comprising an electrolyzer, a hydrogen separator, an alkaline liquid heat exchanger and an alkaline liquid cooler connected end to end in sequence through pipelines to form a first circulating loop, the circulating pipeline passing through the alkaline liquid heat exchanger of the electrolytic hydrogen production device for heat exchange, the energy storage water tank passing through the circulating pipeline and the alkaline liquid heat exchanger of the electrolytic hydrogen production device for heat exchange, the electric boiler providing heating and heat exchange for the water electrolytic hydrogen production device, so that the temperature of the hydrogen production device is continuously maintained at a constant temperature, solving the problem of too low tank temperature affecting the startup time and excessive power loss when the water electrolytic hydrogen production device is intermittently started and stopped, while reducing the heat loss of the electric boiler.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytic hydrogen production, and in particular to a heat management circulating heat exchange system. Background Art

[0002] Wind power, photovoltaic power and other renewable energy sources can generate hydrogen through water electrolysis after generating electricity. This is currently the most important method of producing "green hydrogen". In order to digest a large amount of abandoned wind and electricity or the production needs of enterprises, multiple water electrolysis hydrogen production devices will be used to meet the demand; due to the instability of abandoned wind and electricity and the load regulation of enterprise production and operation, the device will be frequently started and shut down, so it is particularly important to maintain the electrolyte temperature to shorten the startup time and reduce energy consumption; at the same time, in cold areas, the abundant electricity generated by wind power and photovoltaic renewable energy is used, and most factories and office areas use electric boilers for heating. The daily electricity consumption of electric boilers is 5000KWh or even higher, which consumes too much electricity, increases electricity costs, and causes serious heat loss. Summary of the Invention

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the purpose of this application is to propose a thermal management circulating heat exchange system, in which the energy storage water tank exchanges heat with the alkaline liquid heat exchanger of the electrolytic hydrogen production device through a circulation pipeline, and the electric boiler provides heating and heat exchange for the water electrolysis hydrogen production device, so that the temperature of the hydrogen production device is continuously maintained at a constant temperature, solving the problem of low tank temperature affecting the startup time and excessive power loss when the water electrolysis hydrogen production device is intermittently started and stopped, while reducing the heat loss of the electric boiler.

[0005] To achieve the above-mentioned objectives, the present application proposes a thermal management circulation heat exchange system, comprising a circulation pipeline and an electrolysis hydrogen production device connected to the circulation pipeline, wherein an energy storage water tank is provided on the circulation pipeline, and the energy storage water tank is connected to an electric boiler through a pipeline. The electrolysis hydrogen production device comprises an electrolyzer, a hydrogen separator, an alkali liquid heat exchanger and an alkali liquid cooler connected end to end in sequence through pipelines to form a first circulation loop, and the electrolysis hydrogen production device also comprises the electrolyzer, the oxygen separator, the alkali liquid heat exchanger and the alkali liquid cooler connected end to end in sequence through pipelines to form a second circulation loop, and the circulation pipeline exchanges heat through the alkali liquid heat exchanger of the electrolysis hydrogen production device.

[0006] Furthermore, in the electrolytic hydrogen production device, a second heat exchanger is provided between the electrolyzer and the oxygen separator, and a first heat exchanger is provided between the electrolyzer and the hydrogen separator; the thermal management circulating heat exchange system also includes a heating circulation pipeline, which exchanges heat through the first heat exchanger and the second heat exchanger of the electrolytic hydrogen production device, and a heating device is also provided on the heating circulation pipeline, and the heating circulation pipeline heats the heating equipment by exchanging heat through the first heat exchanger and the second heat exchanger of the electrolytic hydrogen production device.

[0007] Furthermore, the water inlet of the heating circulation pipeline is connected to the water outlet of the energy storage water tank, and the water outlet of the heating circulation pipeline is connected to the water inlet of the energy storage water tank.

[0008] Furthermore, the heating circulation pipeline is also provided with a bypass pipeline in parallel, and the bypass pipeline is provided with a third regulating valve.

[0009] Furthermore, a circulation pump is provided on the heating circulation pipeline, and a temperature sensor is provided at the outlet of the circulation pump.

[0010] Furthermore, a pressure sensor is provided on the heating circulation pipeline.

[0011] Furthermore, a first regulating valve and a first shut-off valve are provided on the pipeline connecting the water outlet of the energy storage water tank to the heating circulation pipeline.

[0012] Furthermore, a second regulating valve and a second shut-off valve are provided on the pipeline where the water outlet of the heating circulation pipeline is connected to the water inlet of the energy storage water tank.

[0013] Furthermore, the heat management circulation heat exchange system has a low temperature adjustment mode and a high temperature adjustment mode. When in the low temperature adjustment mode, the first shut-off valve and the second shut-off valve are opened, the third regulating valve is closed, the first regulating valve adjusts its opening according to the temperature sensed by the temperature sensor, and the second regulating valve adjusts its opening according to the pressure sensed by the pressure sensor;

[0014] When in the high temperature regulating mode, the first shut-off valve, the second shut-off valve, the regulating valve, and the second regulating valve are closed, and the third regulating valve is opened.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a partial structural diagram of a heat management circulation heat exchange system proposed in one embodiment of the present application. Figure 1 ;

[0018] Figure 2 This is a partial structural diagram of a heat management circulation heat exchange system proposed in another embodiment of the present application. Figure 2 . DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0020] Figure 1 This is a structural diagram of a heat management circulating heat exchange system proposed in one embodiment of the present application.

[0021] See also Figure 1 A heat management circulation heat exchange system includes a circulation pipeline 1 and an electrolytic hydrogen production device connected to the circulation pipeline 1. The circulation pipeline 1 is provided with an energy storage water tank 2, and the energy storage water tank 2 is externally connected to an electric boiler 3 through a pipeline. The electric boiler 3 is used to heat the circulating water in the energy storage water tank 2. The electrolytic hydrogen production device includes a first circulation loop formed by an electrolyzer 4, a hydrogen separator 5, an alkali liquid heat exchanger 6, and an alkali liquid cooler 7 connected end to end through pipelines. The electrolytic hydrogen production device also includes a second circulation loop formed by the electrolyzer 4, an oxygen separator 8, the alkali liquid heat exchanger 6, and the alkali liquid cooler 7 connected end to end through pipelines. The circulation pipeline 1 exchanges heat through the alkali liquid heat exchanger 6 of the electrolytic hydrogen production device.

[0022] In this embodiment, the number of electrolytic hydrogen production devices is not limited and can be provided based on actual production needs, and can be one or more. When there are multiple electrolytic hydrogen production devices, the multiple electrolytic hydrogen production devices can be connected in parallel to the circulation pipeline. Through the pipeline connection structure between the circulation pipeline and the multiple electrolytic hydrogen production devices, the electric boiler can selectively exchange heat for the multiple electrolytic hydrogen production devices to maintain the temperature of the electrolyte.

[0023] Specifically, after the electrolyte enters the electrolytic cell 4 for electrolysis, its temperature rises to 85±5°C, hydrogen mixed with alkali liquid enters the hydrogen separator 5, and oxygen mixed with alkali liquid enters the oxygen separator 8. After gas-liquid separation in the hydrogen separator 5 and the oxygen separator 8, the alkali liquid is collected and enters the alkali liquid cooler 7 to be cooled to 65±5°C, and then enters the electrolytic cell 4 for electrolysis through a circulation pump. Based on the above situation, the high-temperature waste heat at the outlet of the electrolytic cell can be fully utilized; at the same time, the temperature of the electrolyte must be controlled at an appropriate temperature before entering the electrolytic cell. Too low a temperature will increase the resistance of the electrolyte and increase power consumption, and too high a temperature will cause the electrolytic cell to overheat. Therefore, the temperature of the electrolyte is particularly important for the efficiency of the water electrolysis hydrogen production device, which not only affects the start-up and shutdown time of the device and the energy consumption of the device, but also affects the safety of the system. An alkali liquid heat exchanger is added upstream of the alkali liquid cooler at the confluence of the alkali liquid of the hydrogen separator and the oxygen separator. The water in the energy storage water tank is heated by an electric boiler (65-75℃). The water in the energy storage water tank enters the alkali liquid heat exchanger through a circulation pump to exchange heat with the electrolyte, and then returns to the energy storage water tank after the heat exchange is completed.

[0024] like Figure 2 As shown, in the electrolytic hydrogen production device, a second heat exchanger 9 is provided between the electrolyzer 4 and the oxygen separator 8, and a first heat exchanger 10 is provided between the electrolyzer 4 and the hydrogen separator 5; the thermal management circulating heat exchange system also includes a heating circulation pipeline 11, and the heating circulation pipeline 11 exchanges heat through the first heat exchanger 10 and the second heat exchanger 9 of the electrolytic hydrogen production device. A heating device 12 is also provided on the heating circulation pipeline 11, and the heating circulation pipeline 11 heats the heating device 12 by exchanging heat with the first heat exchanger 10 and the second heat exchanger 9 of the electrolytic hydrogen production device.

[0025] In this embodiment, the heating circulation pipeline 11 is connected to the first heat exchanger 10, the second heat exchanger 9 and the heating equipment 12 in sequence to form a circulation loop. By utilizing the waste heat of the water electrolysis hydrogen production device to heat the heating equipment 12, the waste heat of the electrolyzer is fully utilized. When multiple hydrogen production devices are in operation, the heat generated by the devices themselves can meet the temperature requirements of the heating equipment. The electric boiler will be in standby mode, which not only effectively reduces the operating time of the electric boiler and reduces the electricity consumption, but also ensures the stability of the system temperature of the hydrogen production device, thereby shortening the startup time and reducing the startup energy consumption, maximizing efficiency, and saving costs for the enterprise.

[0026] Specifically, the circulating water in the heating circulation pipeline is heated by the first heat exchanger and the second heat exchanger, and then enters the heating equipment through the circulating pump for heating. After heating, it enters the heat exchanger of the water electrolysis hydrogen production device, and the circulating water is heated by the waste heat of the electrolyzer. The circulating water after heat exchange enters the circulating pump to heat the heating equipment, and the cycle continues.

[0027] The water inlet of the heating circulation pipeline 11 is connected to the water outlet of the energy storage water tank 2, and the water outlet of the heating circulation pipeline 11 is connected to the water inlet of the energy storage water tank 2. In this way, the waste heat from the electric boiler 3 and the electrolytic hydrogen production device can alternately heat the heating equipment 12. When the water electrolytic hydrogen production device is shut down or the waste heat cannot meet the heating demand, the electric boiler can be started to heat the circulating water, and the heating equipment can be heated through the heating circulation pipeline.

[0028] The heating circulation pipeline 11 is also provided with a bypass pipeline in parallel, and the bypass pipeline is provided with a third regulating valve 13. When the third regulating valve 13 is opened, the amount of circulating water entering the heat exchanger of the water electrolysis hydrogen production device can be reduced, thereby achieving the effect of lowering the temperature and regulating the temperature of the circulating water.

[0029] The heating circulation pipeline 11 is also provided with a circulation pump 14. A temperature sensor is provided at the outlet of the circulation pump 14. The provision of the circulation pump can increase the flow rate of the circulating water and improve the efficiency of waste heat utilization of the electrolytic hydrogen production device. The provision of the temperature sensor can monitor the temperature of the circulating water and facilitate timely adjustment.

[0030] The heating circulation pipeline 11 is also provided with a pressure sensor. The pressure sensor can monitor the pressure of the heating circulation pipeline, facilitate timely adjustment, and avoid system overpressure.

[0031] A first regulating valve 15 and a first shut-off valve 16 are provided on the pipeline where the water outlet of the energy storage water tank 2 is connected to the heating circulation pipeline 11 .

[0032] A second regulating valve 17 and a second shut-off valve 18 are provided on the pipeline where the water outlet of the heating circulation pipeline 11 is connected to the water inlet of the energy storage water tank 2 .

[0033] In this embodiment, closing first shut-off valve 16 and second shut-off valve 18 disconnects the heat supply from electric boiler 3, enabling heat exchange between the waste heat from the electrolytic hydrogen production device and the heating equipment. First regulating valve 15 and second regulating valve 17 regulate the amount of hot water supplied by electric boiler 3 to heating circulation line 11, thereby adjusting the temperature of the circulating water within the heating circulation line to meet the heating needs of the heating equipment, i.e., the temperature requirements of the electrolytic hydrogen production device.

[0034] The heat management circulation heat exchange system has a low temperature adjustment mode and a high temperature adjustment mode. When in the low temperature adjustment mode, the first shut-off valve 16 and the second shut-off valve 18 are open, the third regulating valve 13 is closed, the first regulating valve 15 is opened according to the temperature sensed by the temperature sensor, and the second regulating valve 17 is opened according to the pressure sensed by the pressure sensor.

[0035] When in the high temperature adjustment mode, the first shut-off valve 16 , the second shut-off valve 18 , the first regulating valve 15 , and the second regulating valve 17 are closed, and the third regulating valve 13 is opened.

[0036] This system is equipped with high-temperature and low-temperature regulation control measures. For low-temperature regulation, a temperature sensor is installed at the outlet of the circulating pump 14. When the return water heat exchange temperature is lower than 60°C or the system is in a shutdown state, the first shut-off valve 16 and the second shut-off valve 18 at the outlet of the energy storage water tank 2 are opened. The opening of the first regulating valve 15 is adjusted according to the temperature feedback from the temperature sensor, and the opening of the second regulating valve 17 is adjusted according to the system pressure feedback from the pressure transmitter. This ensures that when the system uses the energy storage water tank for heating, the system will not be over-pressurized due to the opening of the first regulating valve 15 and the first shut-off valve 16. When the temperature reaches 65°C, the first shut-off valve 16, the second shut-off valve 18, the first regulating valve 15, and the second regulating valve 17 are closed; high temperature regulation: when the temperature of the temperature sensor is higher than the set value of 70°C, the third regulating valve 13 is opened in a bypass manner to reduce the amount of circulating water entering the first heat exchanger 10 and the second heat exchanger 9 of the water electrolysis hydrogen production device, thereby achieving the effect of lowering the temperature; when the temperature is lower than 65°C, the third regulating valve 13 is closed to increase the amount of circulating water entering the first heat exchanger 10 and the second heat exchanger 9 of the water electrolysis device, thereby achieving the effect of increasing the temperature.

[0037] The energy storage water tank 2 is provided with a temperature sensor to maintain the temperature at 65°C-75°C. When the monitored temperature is lower than the lower limit, the electric boiler is heated. When the temperature is higher than 75°C, the electric boiler is shut down, and the circulating water enters the water electrolysis hydrogen production system through the circulating pump. Each water electrolysis hydrogen production device can also be provided with an alkali solution temperature sensor to monitor the alkali solution temperature, and the alkali solution temperature is set at 60°C. For example, when the temperature monitored by the temperature sensor is lower than 60°C, the first regulating valve 15 is opened, and the water inlet of the alkali solution heat exchanger 6 is increased, thereby performing heat exchange for the device. When the system temperature of the hydrogen production device reaches 60°C, the first regulating valve 15 is closed to achieve the purpose of constant temperature.

[0038] This application adopts electric boilers to provide heating for multiple water electrolysis hydrogen production devices, maintaining the system temperature of the water electrolysis hydrogen production devices while utilizing waste heat to provide heating for the entire plant. Its advantage is that when the electrolyzers are operating stably, the heat generated by the operating water electrolysis hydrogen production devices themselves can meet the temperature requirements of the water electrolysis hydrogen production heat exchange system. The electric boilers are in no-load operation or low-load operation for most of the time, and can also meet the insulation requirements of other electrolyzer devices under shutdown. While reducing the electricity consumption of the electric boilers, it also ensures the need for intermittent start-up and shutdown of the hydrogen production devices, reduces the start-up time of the electrolyzers and reduces electricity consumption. The waste heat generated by the operating electrolyzers enters the heating users through the circulation pump, and fully utilizes the waste heat of the electrolyzers. When multiple electrolyzers are operating stably, the electric boilers are in no-load operation, which greatly reduces the energy consumption of the enterprise and saves costs for the enterprise.

[0039] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0040] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0041] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0042] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A heat management circulation heat exchange system, characterized in that: The invention comprises a circulation pipeline and an electrolytic hydrogen production device connected to the circulation pipeline, wherein an energy storage water tank is provided on the circulation pipeline, and the energy storage water tank is externally connected to an electric boiler through a pipeline. The electrolytic hydrogen production device comprises an electrolytic cell, a hydrogen separator, an alkali liquid heat exchanger, and an alkali liquid cooler connected end to end through a pipeline to form a first circulation loop. The electrolytic hydrogen production device also comprises the electrolytic cell, the oxygen separator, the alkali liquid heat exchanger, and the alkali liquid cooler connected end to end through a pipeline to form a second circulation loop. The circulation pipeline exchanges heat through the alkali liquid heat exchanger of the electrolytic hydrogen production device. In the electrolytic hydrogen production device, a second heat exchanger is provided between the electrolyzer and the oxygen separator, and a first heat exchanger is provided between the electrolyzer and the hydrogen separator; the circulating heat exchange system of the thermal management further comprises a heating circulation pipeline, the heating circulation pipeline exchanges heat through the first heat exchanger and the second heat exchanger of the electrolytic hydrogen production device, a heating device is further provided on the heating circulation pipeline, the heating circulation pipeline heats the heating device by exchanging heat through the first heat exchanger and the second heat exchanger of the electrolytic hydrogen production device, the heating circulation pipeline sequentially connects the first heat exchanger, the second heat exchanger and the heating device to form a circulation loop, and by utilizing the electrolytic hydrogen production device The waste heat of the hydrogen device is used to heat the heating equipment, and the waste heat of the electrolyzer is fully utilized. When multiple electrolytic hydrogen production devices are in operation, the heat generated by the device itself can meet the temperature requirement of the heating equipment. The electric boiler will be in standby mode, and the water inlet end of the heating circulation pipeline is connected to the water outlet of the energy storage water tank, and the water outlet end of the heating circulation pipeline is connected to the water inlet of the energy storage water tank. The waste heat of the electric boiler and the electrolytic hydrogen production device can alternately heat the heating equipment. When the electrolytic hydrogen production device is shut down or the waste heat cannot meet the heating demand, the electric boiler can be started to heat the circulating water, and the heating equipment is heated through the heating circulation pipeline.

2. The heat management circulation heat exchange system according to claim 1, characterized in that: The heating circulation pipeline is further provided with a bypass pipeline in parallel, and the bypass pipeline is provided with a third regulating valve.

3. The heat management circulation heat exchange system according to claim 2, characterized in that: A circulation pump is also provided on the heating circulation pipeline, and a temperature sensor is provided at the outlet of the circulation pump.

4. The heat management circulation heat exchange system according to claim 3, characterized in that: A pressure sensor is also provided on the heating circulation pipeline.

5. The heat management circulation heat exchange system according to claim 4, characterized in that: A first regulating valve and a first shut-off valve are provided on the pipeline where the water outlet of the energy storage water tank is connected to the heating circulation pipeline.

6. The heat management circulation heat exchange system according to claim 5, characterized in that: A second regulating valve and a second shut-off valve are provided on the pipeline where the water outlet of the heating circulation pipeline is connected to the water inlet of the energy storage water tank.

7. The heat management circulation heat exchange system according to claim 6, characterized in that: The thermal management circulation heat exchange system has a low temperature adjustment mode and a high temperature adjustment mode. When in the low temperature adjustment mode, the first shut-off valve and the second shut-off valve are opened, and the third regulating valve is closed. The first regulating valve adjusts its opening according to the temperature sensed by the temperature sensor, and the second regulating valve adjusts its opening according to the pressure sensed by the pressure sensor. When in the high temperature regulating mode, the first shut-off valve, the second shut-off valve, the regulating valve, and the second regulating valve are closed, and the third regulating valve is opened.

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