Temperature-controllable fuel cell waste heat recycling system

Abstract

The embodiment of the utility model provides a temperature-controllable fuel cell waste heat recycling system which comprises a main water storage device, a hydrogen production system cooling assembly connected with a hydrogen production system, and a hydrogen production system waste heat exchanger respectively connected with the hydrogen production system cooling assembly and the main water storage device and used for exchanging heat of the hydrogen production system into the main water storage device. The hydrogen production system heat dissipation device is connected with the hydrogen production system cooling assembly, the hydrogen production system heat dissipation device is connected with the hydrogen production system waste heat exchanger in parallel and used for dissipating heat of the hydrogen production system to the external environment, and the fuel cell cooling assembly is connected with the fuel cell and used for cooling the fuel cell. The fuel cell waste heat exchanger is connected with the fuel cell cooling assembly and the main water storage device and used for exchanging heat of a fuel cell into the main water storage device, and the fuel cell heat dissipation device is connected with the fuel cell cooling assembly and connected with the fuel cell waste heat exchanger in parallel. The heat dissipation device is used for dissipating heat of the fuel cell to the external environment.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and more specifically, to a temperature-controlled fuel cell waste heat recovery and utilization system. Background Technology

[0002] Industrial parks related to smart microgrids possess the natural, spatial, grid infrastructure, and user resources necessary for pilot projects in integrated energy system construction. They have become the main battleground for integrated energy services, business innovation, and profit growth. Developing low-carbon parks is a crucial approach and effective means to achieve dual-carbon goals. Combined heat and power (CHP) related to hydrogen fuel cells has become a major solution for low-carbon parks. Currently, the overall integrated energy utilization efficiency of such parks is low, with significant energy waste. Individual subsystems focus only on improving their own efficiency without considering the overall park-wide perspective, resulting in limited improvement in the overall energy utilization rate. For example, Chinese invention patent application CN202311688833.7 provides a fuel cell CHP device and heating method, which only addresses the technical problem of energy waste caused by cooling towers or air cooling leading to energy dissipation into the environment. However, it does not consider the inconsistent temperature requirements of users, hydrogen production systems, and fuel cell systems during operation, thus resulting in low overall integrated energy utilization efficiency for the park. Utility Model Content

[0003] This application provides a temperature-controlled fuel cell waste heat recovery and utilization system to overcome at least one technical problem existing in the prior art.

[0004] According to an embodiment of this application, a temperature-controlled fuel cell waste heat recovery and utilization system is provided. The fuel cell waste heat recovery and utilization system includes: a main water storage tank, a hydrogen production system, a hydrogen production system cooling assembly, a hydrogen production system waste heat exchanger, a hydrogen production system heat dissipation device, a fuel cell, a fuel cell cooling assembly, a fuel cell waste heat exchanger, and a fuel cell heat dissipation device.

[0005] The first outlet of the main water storage tank is connected to the user's end via a user's water pump.

[0006] The hydrogen production system cooling assembly is connected to the hydrogen production system. The hydrogen production system waste heat exchanger is connected to both the hydrogen production system cooling assembly and the main water storage tank, for exchanging heat from the hydrogen production system to the main water storage tank. The hydrogen production system heat dissipation device is connected to the hydrogen production system cooling assembly and is connected in parallel with the hydrogen production system waste heat exchanger, for dissipating heat from the hydrogen production system to the external environment.

[0007] The fuel cell cooling assembly is connected to the fuel cell. The fuel cell waste heat exchanger is connected to both the fuel cell cooling assembly and the main water storage tank, and is used to exchange the heat of the fuel cell into the main water storage tank. The fuel cell heat dissipation device is connected to the fuel cell cooling assembly and is connected in parallel with the fuel cell waste heat exchanger, and is used to dissipate the heat of the fuel cell to the external environment.

[0008] In some embodiments of this application, the fuel cell waste heat recovery system further includes: a hydrogen production system hot water pump and a first electric three-way valve.

[0009] The second outlet of the main water storage tank is connected to the inlet of the hot water exchange pump of the hydrogen production system. The first port of the first electric three-way valve is connected to the outlet of the hot water exchange pump of the hydrogen production system. The second port of the first electric three-way valve is connected to the first inlet of the waste heat exchanger of the hydrogen production system. The third port of the first electric three-way valve and the first outlet of the waste heat exchanger of the hydrogen production system are respectively connected to the second inlet of the main water storage tank.

[0010] In some embodiments of this application, the hydrogen production system cooling assembly includes a hydrogen production system cooling water tank, a hydrogen production system cooling water pump, and a second electric three-way valve. The hydrogen production system cooling water tank is connected to the cooling outlet of the hydrogen production system and the inlet of the hydrogen production system cooling water pump. The outlet of the hydrogen production system cooling water pump is connected to the first port of the second electric three-way valve. The second port of the second electric three-way valve is connected to the second inlet of the hydrogen production system waste heat exchanger. The third port of the second electric three-way valve is connected to the inlet of the hydrogen production system heat dissipation device. The second outlet of the hydrogen production system waste heat exchanger and the outlet of the hydrogen production system heat dissipation device are connected to the cooling inlet of the hydrogen production system.

[0011] In some embodiments of this application, the fuel cell waste heat recovery system further includes: a fuel cell hot water pump and a third electric three-way valve.

[0012] The third outlet of the main water storage tank is connected to the inlet of the fuel cell hot water exchange pump, the first port of the third electric three-way valve is connected to the outlet of the fuel cell hot water exchange pump, the second port of the third electric three-way valve is connected to the first inlet of the fuel cell waste heat exchanger, and the third port of the third electric three-way valve and the first outlet of the fuel cell waste heat exchanger are respectively connected to the third inlet of the main water storage tank.

[0013] In some embodiments of this application, the fuel cell cooling assembly includes a fuel cell cooling water tank, a fuel cell cooling water pump, and a fourth electric three-way valve. The fuel cell cooling water tank is connected to the cooling outlet of the fuel cell and the inlet of the fuel cell cooling water pump. The outlet of the fuel cell cooling water pump is connected to the first port of the fourth electric three-way valve. The second port of the fourth electric three-way valve is connected to the second inlet of the fuel cell waste heat exchanger. The third port of the fourth electric three-way valve is connected to the inlet of the fuel cell heat dissipation device. The second outlet of the fuel cell waste heat exchanger and the outlet of the fuel cell heat dissipation device are connected to the cooling inlet of the fuel cell.

[0014] In some embodiments of this application, the waste heat exchanger of the hydrogen production system is one or more multi-flow counter-flow heat exchangers selected from plate-fin, plate, spiral wound tube, and shell-and-tube types.

[0015] In some embodiments of this application, the heat dissipation device of the hydrogen production system is either an air-cooled heat sink or a water-cooled heat sink.

[0016] In some embodiments of this application, the fuel cell waste heat exchanger is one or more multi-flow counter-flow heat exchangers selected from plate-fin, plate, spiral wound tube, and shell-and-tube types.

[0017] In some embodiments of this application, the fuel cell heat dissipation device is either an air-cooled heat sink or a water-cooled heat sink.

[0018] In some embodiments of this application, a main water supply valve is provided at the first water inlet of the main water storage tank.

[0019] The beneficial effects of the embodiments of this application are as follows:

[0020] The system has a simple architecture, using a simple water pump and electric three-way valve connected in series and parallel to achieve temperature control. Through precise control of the water pump, electric three-way valve and heat dissipation device, the hydrogen production system, fuel cell and user end all operate within the optimal temperature range. The temperature control accuracy is high. In addition, the system incorporates a heat dissipation device. When the user end temperature is high and heat dissipation is required, it can be dissipated through the heat dissipation device of the hydrogen production system and fuel cell to achieve the goal of rapid cooling. The temperature response speed is fast, and the user's hot water can be supplied within a wide temperature range. The wide temperature control range is more conducive to the use environment of the park. Attached Figure Description

[0021] 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a temperature-controlled fuel cell waste heat recovery and utilization system provided in this application embodiment;

[0023] Explanation of reference numerals in the attached diagram: 1 is the main water storage tank, 2 is the hydrogen production system, 3 is the waste heat exchanger of the hydrogen production system, 4 is the heat dissipation device of the hydrogen production system, 5 is the fuel cell, 6 is the waste heat exchanger of the fuel cell, 7 is the heat dissipation device of the fuel cell, 8 is the user's water pump, 9 is the user's end, 10 is the hydrogen production system's hot water exchange pump, 11 is the first electric three-way valve, 12 is the hydrogen production system's cooling water tank, 13 is the hydrogen production system's cooling water pump, 14 is the second electric three-way valve, 15 is the fuel cell's hot water exchange pump, 16 is the third electric three-way valve, 17 is the fuel cell's cooling water tank, 18 is the fuel cell's cooling water pump, 19 is the fourth electric three-way valve, and 20 is the main water supply valve. Detailed Implementation

[0024] 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 some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, it may include a series of structures, without being limited to the structures listed, but may optionally include structures not listed, or may optionally include other components inherent to these structures.

[0026] This application discloses a temperature-controlled fuel cell waste heat recovery and utilization system, which solves the temperature control problem during waste heat utilization in fuel cell smart microgrid low-carbon parks. It can accelerate temperature response and improve temperature control accuracy while meeting user temperature requirements, hydrogen production temperature requirements, and fuel cell temperature requirements. Detailed descriptions follow.

[0027] Figure 1 This illustration shows a temperature-controlled fuel cell waste heat recovery system according to an embodiment of this application. For example... Figure 1As shown, the fuel cell waste heat recovery and utilization system mainly includes: a main water storage tank 1, a hydrogen production system 2, a hydrogen production system cooling component, a hydrogen production system waste heat exchanger 3, a hydrogen production system heat dissipation device 4, a fuel cell 5, a fuel cell cooling component, a fuel cell waste heat exchanger 6, and a fuel cell heat dissipation device 7. The hydrogen production system 2 uses electrical energy to electrolyze water to produce hydrogen and heat. The fuel cell 5 uses hydrogen as fuel and converts it into electrical energy and heat through an electrochemical reaction. By exchanging the heat of the hydrogen production system 2 and the fuel cell 5 into the main water storage tank 1, the waste heat of the fuel cell is recovered and utilized. The hydrogen production system heat dissipation device 4 and the fuel cell heat dissipation device 7 meet the different temperature requirements of each system in the fuel cell smart microgrid low-carbon park during operation, thereby improving the overall comprehensive energy utilization rate of the park.

[0028] Specifically, the main water storage tank 1 serves as the user water storage area for the fuel cell waste heat recovery system. The first outlet of the main water storage tank 1 is connected to the user terminal 9 via a user-side water pump 8, delivering the stored water from the main water storage tank 1 to the user terminal 9 for user use. In practice, the first inlet of the main water storage tank 1 is equipped with a main water replenishment valve 20. When the water level in the main water storage tank 1 falls below a preset safety threshold, the main water replenishment valve 20 is opened to replenish water to the main water storage tank 1, ensuring that the main water storage tank 1 always stores sufficient water, thereby guaranteeing the safety of the entire system.

[0029] The hydrogen production system cooling assembly is connected to the hydrogen production system 2 to cool it down. The hydrogen production system waste heat exchanger 3 is connected to both the hydrogen production system cooling assembly and the main water storage tank 1, exchanging heat from the hydrogen production system 2 into the main water storage tank 1. The hydrogen production system heat dissipation device 4 is connected to the hydrogen production system cooling assembly and is connected in parallel with the hydrogen production system waste heat exchanger 3, dissipating heat from the hydrogen production system 2 to the external environment, thus controlling the temperature of both the hydrogen production system 2 and the main water storage tank 1.

[0030] In some embodiments, the fuel cell waste heat recovery system further includes: a hydrogen production system hot water pump 10 and a first electric three-way valve 11. The hydrogen production system hot water pump 10 serves as the power device for the circulation of waste heat recovery water in the hydrogen production system 2, and the second outlet of the main water tank 1 is connected to the inlet of the hydrogen production system hot water pump 10. The first electric three-way valve 11 is used to control the flow direction of the waste heat recovery water in the hydrogen production system 2. The first port of the first electric three-way valve 11 is connected to the outlet of the hydrogen production system hot water pump 10, the second port of the first electric three-way valve 11 is connected to the first inlet of the hydrogen production system waste heat exchanger 3, and the third port of the first electric three-way valve 11 and the first outlet of the hydrogen production system waste heat exchanger 3 are respectively connected to the second inlet of the main water tank 1.

[0031] Furthermore, the hydrogen production system cooling components include a hydrogen production system cooling water tank 12, a hydrogen production system cooling water pump 13, and a second electric three-way valve 14. The hydrogen production system cooling water tank 12 serves as the water supply device for the cooling circuit of the hydrogen production system 2, and the hydrogen production system cooling water pump 13 is the power device for the circulating flow of cooling water in the hydrogen production system 2. The hydrogen production system cooling water tank 12 is connected to the cooling water outlet of the hydrogen production system 2 and the water inlet of the hydrogen production system cooling water pump 13, respectively. The second electric three-way valve 14 is used to control the flow direction of the cooling water in the hydrogen production system 2. The first port of the second electric three-way valve 14 is connected to the outlet of the hydrogen production system cooling water pump 13, the second port of the second electric three-way valve 14 is connected to the second water inlet of the hydrogen production system waste heat exchanger 3, and the third port of the second electric three-way valve 14 is connected to the water inlet of the hydrogen production system heat dissipation device 4. The second outlet of the hydrogen production system waste heat exchanger 3 and the outlet of the hydrogen production system heat dissipation device 4 are respectively connected to the cooling water inlet of the hydrogen production system 2. Thus, the hydrogen production cooling circuit and the hydrogen production waste heat utilization circuit are filled with cooling medium through the hydrogen production system cooling water tank 12 and the main water storage tank 1. The cooling medium in the hydrogen production cooling circuit and the hydrogen production waste heat utilization circuit exchanges the heat of the hydrogen production system 2 to the main water storage tank 1, heating the water stored in the main water storage tank 1. The temperature of the hydrogen production system 2 and the main water storage tank 1 is controlled by the hydrogen production system heat dissipation device 4 throughout the process.

[0032] In the specific implementation process, the waste heat exchanger 3 of the hydrogen production system is one or more of the following multi-flow counter-flow heat exchangers: plate-fin type, plate type, spiral wound tube type and shell and tube type. In addition, the heat dissipation device 4 of the hydrogen production system is one of the following: air-cooled heat sink or water-cooled heat sink.

[0033] A fuel cell cooling assembly is connected to the fuel cell 5 to cool it down. A fuel cell waste heat exchanger 6 is connected to both the fuel cell cooling assembly and the main water storage tank 1 to exchange heat from the fuel cell 5 into the main water storage tank 1. A fuel cell heat dissipation device 7 is connected to the fuel cell cooling assembly and is connected in parallel with the fuel cell waste heat exchanger 6 to dissipate heat from the fuel cell 5 into the external environment, thereby controlling the temperature of both the fuel cell 5 and the main water storage tank 1.

[0034] In other embodiments, the fuel cell waste heat recovery system further includes: a fuel cell hot water pump 15 and a third electric three-way valve 16. The fuel cell hot water pump 15 serves as the power device for the circulation of waste heat recovery water in the fuel cell system, and the third outlet of the main water tank 1 is connected to the inlet of the fuel cell hot water pump 15. The third electric three-way valve 16 is used to control the flow direction of the waste heat recovery water in the fuel cell system. The first port of the third electric three-way valve 16 is connected to the outlet of the fuel cell hot water pump 15, the second port of the third electric three-way valve 16 is connected to the first inlet of the fuel cell waste heat exchanger 6, and the third port of the third electric three-way valve 16 and the first outlet of the fuel cell waste heat exchanger 6 are respectively connected to the third inlet of the main water tank 1.

[0035] Furthermore, the fuel cell cooling assembly includes a fuel cell cooling water tank 17, a fuel cell cooling water pump 18, and a fourth electric three-way valve 19. The fuel cell cooling water tank 17 serves as a water supply device for the cooling circuit of the fuel cell system, and the fuel cell cooling water pump 18 is the power unit for the circulating flow of cooling water in the fuel cell system. The fuel cell cooling water tank 17 is connected to the cooling outlet of the fuel cell 5 and the inlet of the fuel cell cooling water pump 18. The fourth electric three-way valve 19 controls the flow direction of the cooling water in the fuel cell system. The first port of the fourth electric three-way valve 19 is connected to the outlet of the fuel cell cooling water pump 18, the second port of the fourth electric three-way valve 19 is connected to the second inlet of the fuel cell waste heat exchanger 6, and the third port of the fourth electric three-way valve 19 is connected to the inlet of the fuel cell heat dissipation device 7. The second outlet of the fuel cell waste heat exchanger 6 and the outlet of the fuel cell heat dissipation device 7 are connected to the cooling inlet of the fuel cell 5. Thus, the fuel cell cooling circuit and fuel cell waste heat utilization circuit are filled with cooling medium through the fuel cell cooling water tank 17 and the main water storage tank 1. The cooling medium in the fuel cell cooling circuit and fuel cell waste heat utilization circuit is used to exchange the heat of the fuel cell 5 to the main water storage tank 1, heating the water stored in the main water storage tank 1. The temperature of the fuel cell 5 and the main water storage tank 1 is controlled throughout the process by the fuel cell heat dissipation device 7.

[0036] In the specific implementation process, the fuel cell waste heat exchanger 6 is one or more of the following multi-flow counter-flow heat exchangers: plate-fin type, plate type, spiral tube type, and shell and tube type. In addition, the fuel cell heat dissipation device 7 is one of the following: air-cooled heat sink or water-cooled heat sink.

[0037] The above describes the various components of the temperature-controlled fuel cell waste heat recovery system provided in this embodiment and their interconnections. The following section will discuss further details. Figure 1 The working principle of a temperature-controlled fuel cell waste heat recovery and utilization system is described in detail.

[0038] In this embodiment, the hydrogen production cooling circuit, fuel cell cooling circuit, and total waste heat utilization circuit (i.e., hydrogen production waste heat utilization circuit and fuel cell waste heat utilization circuit) are filled with cooling medium through the hydrogen production system cooling water tank 12, fuel cell cooling water tank 17, and total water storage tank 1. The hydrogen production system 2 and hydrogen production system cooling water pump 13 are started to deliver qualified hydrogen produced by the hydrogen production system 2 to the fuel cell 5 and to cool the hydrogen production system 2. The hydrogen production system cooling water pump 13, the first electric three-way valve 11, the second electric three-way valve 14, and the hydrogen production system heat dissipation device 4 are controlled according to the optimal operating temperature of the hydrogen production system 2 to ensure the optimal operating temperature of the hydrogen production system 2. After the hydrogen production system 2 generates enough hydrogen and can stably generate qualified hydrogen, the fuel cell 5 is started. After the fuel cell 5 reaches a suitable operating temperature, the fuel cell hot water pump 15, the third electric three-way valve 16, the fourth electric three-way valve 19, and the fuel cell heat dissipation device 7 are started to ensure that the fuel cell 5 is always at a suitable operating temperature. Furthermore, after the fuel cell waste heat recovery system is activated, once the water in the main water storage tank 1 reaches a suitable temperature, it is pumped to the user terminal 9 by the user-side water pump 8 for user use. The main water supply valve 20 is used to ensure a continuous supply of hot water to the user terminal 9.

[0039] In detail, water is added to the main water storage tank 1, the hydrogen production system cooling water tank 12, and the fuel cell cooling water tank 17. The hydrogen production system cooling water pump 13, the hydrogen production system hot water exchange pump 10, the fuel cell cooling water pump 18, and the fuel cell hot water exchange pump 15 are started to fill all the pipelines of the fuel cell waste heat recovery system with water.

[0040] The hydrogen production system 2 is started, and based on the current temperatures of the hydrogen production system 2 and the main water storage tank 1, the target speed of the hydrogen production system's hot water exchange pump 10, the target opening degree of the first electric three-way valve 11, the target opening degree of the second electric three-way valve 14, and the target heat dissipation of the hydrogen production system's heat dissipation device 4 are obtained. The hydrogen production system's hot water exchange pump 10 is controlled according to its target speed, the first electric three-way valve 11 is controlled according to its target opening degree, the second electric three-way valve 14 is controlled according to its target opening degree, and the hydrogen production system's heat dissipation device 4 is controlled according to its target heat dissipation. This transfers the heat from the hydrogen production system 2 to the main water storage tank 1 via the hydrogen production system's waste heat exchanger 3, ensuring that the hydrogen production system 2 is always at its optimal operating temperature and the water in the main water storage tank 1 is at its optimal and suitable temperature.

[0041] Once the hydrogen production system 2 has generated enough hydrogen and can stably produce qualified hydrogen, the fuel cell 5 is started. Based on the current temperatures of the fuel cell 5 and the total water storage tank 1, the target speed of the fuel cell heat exchange pump 15, the target opening degree of the third electric three-way valve 16, the target opening degree of the fourth electric three-way valve 19, and the target heat dissipation of the fuel cell heat dissipation device 7 are determined. The fuel cell heat exchange pump 15 is controlled according to the target speed, the third electric three-way valve 16 is controlled according to the target opening degree, the fourth electric three-way valve 19 is controlled according to the target opening degree, and the fuel cell heat dissipation device 7 is controlled according to the target heat dissipation of the fuel cell heat dissipation device 7. This transfers the heat from the fuel cell 5 to the total water storage tank 1 via the fuel cell waste heat exchanger 6, ensuring that the fuel cell 5 is always at its optimal operating temperature and the water in the total water storage tank 1 is at its optimal and suitable temperature.

[0042] During the above process, when the water temperature in the main water storage tank 1 is low, all the heat from the hydrogen production system 2 and the fuel cell 5 is exchanged into the main water storage tank 1 to raise the water temperature. When the water temperature in the main water storage tank 1 rises to a preset temperature threshold, the operating power of the hydrogen production system 2 and the fuel cell 5 is reduced. If the generated heat is still greater than the heat required by the user terminal 9, the excess heat is dissipated through the hydrogen production system cooling device 4 and the fuel cell cooling device 7. If the hot water temperature required by the user terminal 9 suddenly drops, heat can be transferred in reverse through the hydrogen production system waste heat exchanger 3 and the fuel cell waste heat exchanger 6, and then dissipated through the hydrogen production system cooling device 4 and the fuel cell cooling device 7.

[0043] Once the water level in the main water tank 1 reaches the user's operating temperature, the user-side water pump 8 is activated to provide hot water to the user at the user end 9. When the water level in the main water tank 1 drops to the safe water level threshold (i.e., the water volume is lower than the preset safe threshold), the main water supply valve 20 is opened to replenish water to the main water tank 1.

[0044] It should be noted and understood that, in this application, the temperatures of the hydrogen production system 2, fuel cell 5, and total water storage tank 1 can be obtained in real time through temperature sensors. Furthermore, the calculations of "obtaining the target rotational speed of the hydrogen production system's hot water pump 10, the target opening degree of the first electric three-way valve 11, the target opening degree of the second electric three-way valve 14, and the target heat dissipation of the hydrogen production system's heat dissipation device 4 based on the current temperatures of the hydrogen production system 2 and the total water storage tank 1," and "obtaining the target rotational speed of the fuel cell's hot water pump 15, the target opening degree of the third electric three-way valve 16, the target opening degree of the fourth electric three-way valve 19, and the target heat dissipation of the fuel cell's heat dissipation device 7 based on the current temperatures of the fuel cell 5 and the total water storage tank 1," can be performed by calibrating and setting the target rotational speed, target opening degree, and target heat dissipation at various temperatures in the early stages, or they can be calculated in real time based on the current temperature. This application does not impose any limitations on these calculations.

[0045] In summary, this application discloses a temperature-controllable fuel cell waste heat recovery and utilization system. The system has a simple architecture, which uses a simple water pump and an electric three-way valve connected in series and parallel to achieve temperature control. Through precise control of the water pump, electric three-way valve, and heat dissipation device, the hydrogen production system, fuel cell, and user end all operate within the optimal temperature range, resulting in high temperature control accuracy. Furthermore, the system incorporates a heat dissipation device, which can dissipate heat through the hydrogen production system and fuel cell when the user end temperature is high, achieving rapid cooling. The temperature response speed is fast, and the user's hot water can be supplied within a wide temperature range, resulting in a wide temperature control range, which is more conducive to the use environment of the park.

[0046] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing this invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope described in the claims.

Claims

1. A temperature-controlled fuel cell waste heat recovery and utilization system, characterized in that, The fuel cell waste heat recovery and utilization system includes: a main water storage tank, a hydrogen production system, a hydrogen production system cooling assembly, a hydrogen production system waste heat exchanger, a hydrogen production system heat dissipation device, a fuel cell, a fuel cell cooling assembly, a fuel cell waste heat exchanger, and a fuel cell heat dissipation device. The first outlet of the main water storage tank is connected to the user's end via a user's water pump. The hydrogen production system cooling assembly is connected to the hydrogen production system. The hydrogen production system waste heat exchanger is connected to both the hydrogen production system cooling assembly and the main water storage tank, for exchanging heat from the hydrogen production system to the main water storage tank. The hydrogen production system heat dissipation device is connected to the hydrogen production system cooling assembly and is connected in parallel with the hydrogen production system waste heat exchanger, for dissipating heat from the hydrogen production system to the external environment. The fuel cell cooling assembly is connected to the fuel cell. The fuel cell waste heat exchanger is connected to both the fuel cell cooling assembly and the main water storage tank, and is used to exchange the heat of the fuel cell into the main water storage tank. The fuel cell heat dissipation device is connected to the fuel cell cooling assembly and is connected in parallel with the fuel cell waste heat exchanger, and is used to dissipate the heat of the fuel cell to the external environment.

2. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The fuel cell waste heat recovery and utilization system also includes: a hydrogen production system hot water pump and a first electric three-way valve. The second outlet of the main water storage tank is connected to the inlet of the hot water exchange pump of the hydrogen production system. The first port of the first electric three-way valve is connected to the outlet of the hot water exchange pump of the hydrogen production system. The second port of the first electric three-way valve is connected to the first inlet of the waste heat exchanger of the hydrogen production system. The third port of the first electric three-way valve and the first outlet of the waste heat exchanger of the hydrogen production system are respectively connected to the second inlet of the main water storage tank.

3. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 2, characterized in that, The hydrogen production system cooling assembly includes a hydrogen production system cooling water tank, a hydrogen production system cooling water pump, and a second electric three-way valve. The hydrogen production system cooling water tank is connected to the cooling water outlet of the hydrogen production system and the water inlet of the hydrogen production system cooling water pump. The water outlet of the hydrogen production system cooling water pump is connected to the first port of the second electric three-way valve. The second port of the second electric three-way valve is connected to the second water inlet of the hydrogen production system waste heat exchanger. The third port of the second electric three-way valve is connected to the water inlet of the hydrogen production system heat dissipation device. The second water outlet of the hydrogen production system waste heat exchanger and the water outlet of the hydrogen production system heat dissipation device are connected to the cooling water inlet of the hydrogen production system.

4. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The fuel cell waste heat recovery and utilization system also includes: a fuel cell hot water pump and a third electric three-way valve. The third outlet of the main water storage tank is connected to the inlet of the fuel cell hot water exchange pump, the first port of the third electric three-way valve is connected to the outlet of the fuel cell hot water exchange pump, the second port of the third electric three-way valve is connected to the first inlet of the fuel cell waste heat exchanger, and the third port of the third electric three-way valve and the first outlet of the fuel cell waste heat exchanger are respectively connected to the third inlet of the main water storage tank.

5. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 4, characterized in that, The fuel cell cooling assembly includes a fuel cell cooling water tank, a fuel cell cooling water pump, and a fourth electric three-way valve. The fuel cell cooling water tank is connected to the cooling outlet of the fuel cell and the inlet of the fuel cell cooling water pump. The outlet of the fuel cell cooling water pump is connected to the first port of the fourth electric three-way valve. The second port of the fourth electric three-way valve is connected to the second inlet of the fuel cell waste heat exchanger. The third port of the fourth electric three-way valve is connected to the inlet of the fuel cell heat dissipation device. The second outlet of the fuel cell waste heat exchanger and the outlet of the fuel cell heat dissipation device are connected to the cooling inlet of the fuel cell.

6. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The waste heat exchanger of the hydrogen production system is one or more of the following: plate-fin type, plate type, spiral wound tube type, and shell and tube type multi-flow counter-flow heat exchanger.

7. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The heat dissipation device of the hydrogen production system is either an air-cooled heat sink or a water-cooled heat sink.

8. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The waste heat exchanger for the fuel cell is one or more of the following: plate-fin, plate, spiral wound tube, and shell-and-tube multi-flow counter-flow heat exchangers.

9. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The fuel cell heat dissipation device is either an air-cooled heat sink or a water-cooled heat sink.

10. The temperature-controlled fuel cell waste heat recovery and utilization system according to claim 1, characterized in that, The main water reservoir is equipped with a main water supply valve at its first water inlet.

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