Composite storage device and fuel cell water generation utilization system

Abstract

The application discloses a composite storage device and a fuel cell generated water utilization system. The composite storage device comprises a water storage unit and a dynamic storage unit. The water storage unit is internally provided with a water storage cavity used for storing generated water of a fuel cell system. The dynamic storage unit is arranged in the storage cavity and internally used for storing fuel. The dynamic storage unit can expand or shrink according to the increase or consumption of the internal fuel. The application can fully utilize the heat in the use process of the fuel cell system and the space gap in the internal water storage unit, and effectively improves the space utilization.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more specifically to a composite storage device and a fuel cell-generated water utilization system. Background Technology

[0002] Fuel cell technology, as a highly efficient and clean energy conversion method, has received widespread attention and application in recent years. Fuel cells directly convert fuel and oxidant into electrical energy through electrochemical reactions, while simultaneously producing water as a byproduct. During operation, fuel cell systems generate a large amount of water, primarily divided into oxygen-side generated water and hydrogen-side generated water. Since the hydrogen-side generated water contains some dissolved hydrogen and the oxygen-side generated water contains some dissolved oxygen, existing power generation devices use separate hydrogen-side and oxygen-side water tanks to store the generated water and mitigate potential safety hazards caused by hydrogen-oxygen mixing.

[0003] For example, invention patent CN101569046B discloses a fuel cell system, which includes: a fuel cell that generates electricity using fuel gas and oxidant gas; a hydrogen generation device for a reformer that generates hydrogen-containing fuel gas from feedstock and water vapor; a cooling water path for cooling water within the fuel cell; a cooling water storage tank for storing the cooling water; and a recovery water storage tank for storing water recovered from the fuel gas and oxidant gas discharged from the fuel cell. Water separated from the anode and cathode tail gases is stored in the recovery water storage tank via the recovery water path for subsequent recycling and reuse.

[0004] In existing fuel cell systems, the generated water is stored in a recycled water tank, while the fuel required by the fuel cell system is generally stored in a fuel tank. Although this storage method can store both generated water and fuel, the storage devices occupy a large space and have low space utilization. When the recycled water tank is not storing water, it will result in wasted space. If the fuel tank is placed inside the recycled water tank, then when the recycled water tank needs to store generated water, it may face the problem of insufficient space. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a composite storage device and a fuel cell generated water utilization system to solve the technical problem that the generated water storage device of the fuel cell system in the prior art often occupies a large space and causes space waste when no water is stored.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a composite storage device, comprising: a water storage unit and a dynamic storage unit, wherein the water storage unit is provided with a water storage chamber for storing water generated by a fuel cell system; the dynamic storage unit is disposed within the water storage chamber and is used to store fuel, and the dynamic storage unit is capable of expanding or contracting accordingly based on the increase or consumption of internal fuel.

[0008] In some embodiments, the dynamic storage unit includes a storage bladder for storing liquid fuel.

[0009] In some embodiments, the dynamic storage unit further includes a fixing net that wraps around the storage bladder and is connected to the inner wall of the water storage unit to limit the degree of expansion of the storage bladder during filling and its movement within the water storage cavity.

[0010] In some embodiments, the composite storage device further includes a static storage unit disposed within the water storage chamber for storing hydrogen fuel.

[0011] In some embodiments, the water storage unit further includes an isolator disposed within the water storage chamber to divide the water storage chamber into an oxygen-side water storage chamber and a hydrogen-side water storage chamber, for storing the oxygen-side generated water and hydrogen-side generated water of the fuel cell system, respectively.

[0012] In some embodiments, the dynamic storage unit is disposed within the oxygen-side water storage chamber, and the static storage unit is disposed within the hydrogen-side water storage chamber.

[0013] In some embodiments, the composite storage device further includes an oxygen-side water tank and a hydrogen-side water tank. The oxygen-side water tank is connected to the oxygen-side water storage chamber and is used to store excess oxygen-side generated water in the oxygen-side water storage chamber. The hydrogen-side water tank is connected to the hydrogen-side water storage chamber and is used to store excess hydrogen-side generated water in the hydrogen-side water storage chamber. A first liquid level sensor and a second liquid level sensor are respectively provided in the oxygen-side water storage chamber and the hydrogen-side water storage chamber to detect the water level in the oxygen-side water storage chamber and the hydrogen-side water storage chamber, respectively. When the water level in the oxygen-side water storage chamber is higher than a preset value, excess oxygen-side generated water is discharged into the oxygen-side water tank, and when the water level in the hydrogen-side water storage chamber is higher than a preset value, excess hydrogen-side generated water is discharged into the hydrogen-side water tank.

[0014] In some embodiments, the composite storage device further includes a hydrogen elimination reactor, wherein the tail oxygen outlet of the oxygen-side water storage chamber and the tail hydrogen outlet of the hydrogen-side water storage chamber are both connected to the hydrogen elimination reactor; an oxygen concentration sensor and a pressure sensor are respectively installed in the oxygen-side water storage chamber and the hydrogen-side water storage chamber to detect the oxygen concentration in the oxygen-side water storage chamber and the pressure in the hydrogen-side water storage chamber, respectively. When the oxygen concentration in the oxygen-side water storage chamber is higher than a preset concentration value, the tail oxygen is discharged into the hydrogen elimination reactor for treatment, and when the pressure in the hydrogen-side water storage chamber exceeds a preset pressure value, the tail hydrogen is discharged into the hydrogen elimination reactor for treatment.

[0015] In some embodiments, a first temperature sensor and a second temperature sensor are respectively provided in the oxygen-side water storage chamber and the hydrogen-side water storage chamber, and the first temperature sensor and the second temperature sensor are respectively used to monitor the temperature in the oxygen-side water storage chamber and the hydrogen-side water storage chamber.

[0016] Secondly, the present invention provides a fuel cell-generated water utilization system, including the composite storage device described in any one of the above claims. The fuel cell-generated water utilization system further includes a fuel cell system, wherein the fuel inlet of the fuel cell system is connected to the dynamic storage unit, and its generated water outlet is connected to the water storage unit.

[0017] Compared with existing technologies, the composite storage device and fuel cell generated water utilization system provided by this invention, by setting up a water storage unit and a dynamic storage unit, places the dynamic storage unit for storing fuel inside the water storage unit for storing generated water. This fully utilizes the internal space of the water storage unit. The dynamic storage unit can expand or contract accordingly based on the increase or consumption of fuel inside. During operation, as fuel is consumed, the volume of the dynamic storage unit continuously decreases, while the water generated by the fuel cell system is continuously discharged and stored in its external water storage chamber. This fully utilizes the space created by the compression of the dynamic storage unit, achieving a dynamic balance between fuel loss and generated water storage. Furthermore, placing the dynamic storage unit for storing fuel inside the water storage unit for storing generated water ensures that the fuel requiring preheating is in a water bath state at 60-70°C, effectively utilizing the heat generated during the use of the fuel cell system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the composite storage device and the fuel cell-generated water utilization system provided in the embodiments of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Water storage unit; 101. Oxygen-side water storage chamber; 102. Hydrogen-side water storage chamber; 11. Water tank; 12. Thermally conductive partition; 13. First liquid level sensor; 14. Second liquid level sensor; 15. Oxygen concentration sensor; 16. Pressure sensor; 17. First temperature sensor; 18. Second temperature sensor;

[0021] 2. Dynamic storage unit; 21. Storage capsule; 22. Fixed mesh;

[0022] 3. Static storage unit;

[0023] 41. Oxygen-side water tank; 42. Hydrogen-side water tank; 43. First pipeline; 44. Second pipeline; 45. First valve; 46. Second valve; 51. Hydrogen removal reactor; 52. Third pipeline; 53. Fourth pipeline; 54. Third valve; 55. Fourth valve;

[0024] 6. Fuel cell system. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] To address the technical problem that fuel cell system water storage devices often occupy a large space and cause space waste when not filled with water, this invention provides a composite storage device and a fuel cell water utilization system. This system can fully utilize the heat generated during the operation of the fuel cell system and the space gaps inside the water storage unit, effectively improving space utilization. It can not only effectively separate and store water generated from different sides of the fuel cell system, but also provide a stable and safe environment for dynamic and static storage units.

[0027] It should be noted that the composite storage device described in this invention is used in, but not limited to, fuel cell water generation and utilization systems. For ease of explanation, this invention will only use the application of the composite storage device in a fuel cell water generation and utilization system as an example. The principle of the composite storage device in other types of equipment is essentially the same as that in the fuel cell water generation and utilization system, and will not be described in detail here.

[0028] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of a composite storage device and a fuel cell generated water utilization system in one embodiment of the present invention. In a first aspect, the present invention provides a composite storage device, including: a water storage unit 1 and a dynamic storage unit 2. The water storage unit 1 is provided with a water storage cavity, which is used to store the generated water of the fuel cell system 6. The dynamic storage unit 2 is disposed in the water storage cavity and is used to store fuel. The liquid storage device can expand or contract accordingly according to the increase or consumption of internal fuel.

[0029] In this device, the design of the water storage unit 1 and the dynamic storage unit 2 is combined with the requirements of the fuel cell system 6. The water storage unit 1 not only provides storage space for the generated water, but its internal structure design also helps to maintain the thermal efficiency and space utilization of the entire system. The dynamic storage unit 2 can automatically adjust its volume as fuel is consumed, ensuring efficient use of storage space and avoiding space waste.

[0030] Preferably, in this embodiment, the water storage unit 1 further includes an isolator disposed within the water storage cavity to divide the water storage cavity into an oxygen-side water storage cavity and a hydrogen-side water storage cavity, for storing the oxygen-side generated water and hydrogen-side generated water of the fuel cell system 6, respectively. The composite storage device further includes a static storage unit 3 for storing hydrogen fuel, while the dynamic storage unit 2 is used to store liquid fuels such as methanol for supply to the fuel cell. Since the oxygen-side generated water accounts for a large proportion of the total generated water, the dynamic storage unit 2 is disposed within the oxygen-side water storage cavity 101; the static storage unit 3 is disposed within the hydrogen-side water storage cavity 102.

[0031] This design includes an oxygen-side water storage chamber 101 and a hydrogen-side water storage chamber 102, which are used to store oxygen-side generated water and hydrogen-side generated water produced by the fuel cell system 6 during operation, respectively, to prevent the hydrogen side from coming into contact with the oxygen side and causing danger. The dynamic storage unit 2 and the static storage unit 3 are respectively located in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102, so that the liquid fuel that needs to be preheated and the static storage unit 3 are in a water bath state of 60~70℃. This effectively utilizes the heat generated during the use of the fuel cell system 6 and significantly reduces the space occupied by the system, making the entire device more compact and suitable for space-constrained applications. It can not only effectively separate and store the different side generated water produced by the fuel cell system 6, but also provide a stable and safe environment for the dynamic storage unit 2 and the static storage unit 3.

[0032] In some possible configurations, the dynamic storage unit 2 employs a storage bladder 21 design, which expands or contracts accordingly based on the increase or consumption of internal fuel. During operation, as fuel is consumed, the volume of the storage bladder 21 continuously decreases, while the water generated by the fuel cell system 6 is continuously discharged to the oxygen-side water storage chamber 101 on its outer side. This fully utilizes the space created by the compression of the storage bladder, achieving a dynamic balance between oxygen-side fuel loss and generated water storage. By immersing the static storage unit 3 in water, the internal space gaps of the water storage unit 1 can be fully utilized, thereby effectively improving space utilization on both the hydrogen and oxygen sides.

[0033] In some possible embodiments, the static storage unit 3 preferably employs an alloy hydrogen storage tank, with the volume of the oxygen-side water storage chamber 101 being larger than the volume of the hydrogen-side water storage chamber 102. In the fuel cell system 6, the hydrogen-side generated water produced by the power generation device flows into the hydrogen-side water storage chamber 102. Given that the proportion of hydrogen-side generated water is approximately 10% to 20% of the total generated water, the hydrogen-side water storage chamber 102 does not need to increase in volume during use. Utilizing an alloy hydrogen storage tank as a hydrogen storage device not only effectively stores hydrogen but also allows for temperature regulation using the hydrogen-side generated water, thereby optimizing its hydrogen storage and release performance. Furthermore, the alloy hydrogen storage tank employs a waterproof structural design, ensuring its safety and stability during operation. Through this design, the various resources required by the fuel cell system 6 are efficiently stored and regulated within a limited space, further improving the overall system's operating efficiency and reliability.

[0034] It should be clarified that the layout of the dynamic storage unit 2 and the static storage unit 3 is not specifically limited in other possible embodiments. For example, the dynamic storage unit 2 can be placed in the hydrogen-side water storage chamber, while the static storage unit 3 can be placed in the oxygen-side water storage chamber. As long as the dynamic and static storage units are placed in different water storage chambers to avoid the danger of contact between the hydrogen and oxygen sides, the needs of practical applications can be met. In addition, the dynamic storage unit 2 can also adopt other forms of deformable containers, such as elastic membrane bags or corrugated pipes, as long as they can meet the requirement of automatically adjusting the volume according to changes in the internal fuel quantity, thus achieving efficient space utilization and dynamic balance.

[0035] To prevent damage or leakage caused by excessive expansion or positional displacement of the storage bladder 21 during operation, and considering safety factors, in some possible embodiments, the dynamic storage unit 2 further includes a fixing net 22. The fixing net 22 is wrapped around the outside of the storage bladder 21, and the top of the fixing net 22 is fixed to the inner wall of the water storage unit 1. This allows the storage bladder 21 to expand and contract freely as fuel is added and consumed. At the same time, it can also limit the degree of expansion of the storage bladder 21 during filling and its movement within the oxygen-side water storage chamber 101, preventing excessive deformation or positional displacement of the storage bladder 21 during expansion or contraction. This effectively protects the structural integrity of the storage bladder 21 and extends the service life of the dynamic storage unit 2.

[0036] Furthermore, in other possible embodiments, the connection between the fixed net 22 and the inner wall of the water storage unit 1 is designed to be adjustable, so that the operator can adjust the tightness of the fixed net 22 according to actual needs, further optimizing the flexibility and adaptability of the dynamic storage unit 2.

[0037] The fuel cell power generation device generates water at a temperature of approximately 60-70°C. A water bath arrangement ensures that the liquid fuel requiring heating and the alloy hydrogen storage tank are constantly preheated. In some possible embodiments, the water storage unit 1 includes a water tank 11, with a thermally conductive partition 12 as the separator. The thermally conductive partition 12 is sealed to the water tank 11, dividing the internal space of the water tank 11 into two independent areas: an oxygen-side water storage chamber 101 and a hydrogen-side water storage chamber 102. This ensures effective isolation and separate storage of the oxygen-side and hydrogen-side generated water. The thermally conductive partition 12 not only serves as a spatial divider but also effectively transfers heat. During the operation of the fuel cell system 6, due to the low heat transfer efficiency of the alloy hydrogen storage tank, the temperature of the oxygen-side generated water inside the water storage unit 1 will be lower than that of the hydrogen-side generated water. The heat-conducting partition 12 is made of heat-conducting materials, such as aluminum, copper, or heat-conducting plastic, which can transfer the heat of the hydrogen-side generated water to the oxygen-side generated water in a timely manner, so that the water temperature in the two storage chambers tends to be the same. The hydrogen-side water storage chamber 102 maintains a high-efficiency heat source by timely discharging the generated water that has used up its heat, thus achieving efficient utilization of heat.

[0038] In order to achieve the discharge and storage of generated water, in some possible embodiments, the composite storage device further includes an oxygen-side water tank 41, a hydrogen-side water tank 42, a first pipe 43, a second pipe 44, a first valve 45 and a second valve 46, and a first liquid level sensor 13 and a second liquid level sensor 14 are respectively installed in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102.

[0039] Specifically, the oxygen-side water tank 41 is connected to the oxygen-side water storage chamber 101 via the first pipe 43, and is used to store excess oxygen-side generated water in the oxygen-side water storage chamber 101; the hydrogen-side water tank 42 is connected to the hydrogen-side water storage chamber 102 via the second pipe 44, and is used to store excess hydrogen-side generated water in the hydrogen-side water storage chamber 102. A first valve 45 and a second valve 46 are respectively installed on the first pipe 43 and the second pipe 44. The first liquid level sensor 13 and the second liquid level sensor 14 are connected to the first valve 45 and the second valve 46 respectively via a controller. When the water level in the oxygen-side water storage chamber 101 is higher than a preset value, the first liquid level sensor 13 sends a signal to the controller, and the controller controls the first valve 45 to open, discharging excess oxygen-side generated water into the oxygen-side water tank 41; when the water level in the hydrogen-side water storage chamber 102 is higher than a preset value, the second liquid level sensor 14 sends a signal to the controller, and the controller controls the second valve 46 to open, discharging excess hydrogen-side generated water into the hydrogen-side water tank 42.

[0040] This intelligent water level management system not only ensures that the water level in the composite storage device is always maintained within a safe and efficient range, but also enables the effective utilization and management of the water generated by the fuel cell system 6. When the water level in the oxygen-side water storage chamber 101 or the hydrogen-side water storage chamber 102 exceeds the preset safety threshold, the corresponding liquid level sensor will respond quickly and automatically open the corresponding valve through the controller to drain the excess water into the corresponding water tank, effectively avoiding potential safety hazards caused by excessively high water levels.

[0041] Furthermore, in some possible embodiments, the position of the liquid level sensor is adjustable, allowing operators to adjust the preset water level threshold according to actual needs to meet the requirements of different application scenarios.

[0042] In order to treat the tail oxygen and tail hydrogen, in some possible embodiments, the composite storage device further includes a hydrogen removal reactor 51, a third pipeline 52, a fourth pipeline 53, a third valve 54 and a fourth valve 55, and an oxygen concentration sensor 15 and a pressure sensor 16 are respectively installed in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102.

[0043] Specifically, the tail oxygen outlet of the oxygen-side water storage chamber 101 is connected to the hydrogen elimination reactor 51 via the third pipe 52, and the tail hydrogen outlet of the hydrogen-side water storage chamber 102 is connected to the hydrogen elimination reactor 51 via the fourth pipe 53. A third valve 54 and a fourth valve 55 are respectively installed on the third pipe 52 and the fourth pipe 53. The oxygen concentration sensor 15 and the pressure sensor 16 are connected to the third valve 54 and the fourth valve 55 respectively via a controller. When the oxygen concentration in the oxygen-side water storage chamber 101 is higher than a preset concentration value, the oxygen concentration sensor 15 sends a signal to the controller, which controls the third valve 54 to open, discharging the tail oxygen into the hydrogen elimination reactor 51 for processing. When the pressure in the hydrogen-side water storage chamber 102 exceeds a preset pressure value, the pressure sensor 16 sends a signal to the controller, which controls the fourth valve 55 to open, discharging the tail hydrogen into the hydrogen elimination reactor 51 for processing.

[0044] Furthermore, the outlet of the hydrogen-generated water from the hydrogen removal reactor 51 is connected to the hydrogen-side water storage chamber 102, ensuring that the hydrogen-generated water produced by the hydrogen removal reactor 51 during the treatment of tail oxygen and tail hydrogen can be directly returned to the hydrogen-side water storage chamber 102, thereby further improving the utilization rate of water resources. Oxygen concentration sensors 15 or pressure sensors 16 installed on both sides of the water storage tank 11 can promptly discharge tail hydrogen and tail oxygen into the hydrogen removal reactor 51. During this process, by controlling the hydrogen concentration to be higher than the oxygen concentration, it is ensured that the hydrogen-removed reaction water discharged into the hydrogen-side water storage chamber 102 contains only a small amount of hydrogen, avoiding contact between the hydrogen and oxygen sides throughout the process, effectively preventing the mixing of unreacted tail hydrogen and tail oxygen, thereby improving the safety of the water tank.

[0045] This design not only effectively controls the oxygen concentration and pressure in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102, preventing potential safety hazards caused by excessive oxygen concentration or pressure, but also makes full use of the hydrogen removal reactor 51 to treat the tail gas and tail hydrogen, further improving the safety and reliability of the entire system.

[0046] It should be noted that the hydrogen removal reactor 51 is existing technology, which is widely used in the field of hydrogen recovery and treatment. Its specific structure and principle will not be described in detail here.

[0047] To achieve temperature monitoring and control, in some possible embodiments, a first temperature sensor 17 and a second temperature sensor 18 are respectively equipped in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102. The first temperature sensor 17 and the second temperature sensor 18 are responsible for real-time monitoring of the temperature conditions within the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102. The first temperature sensor 17 monitors the temperature of the oxygen-side generated water in the oxygen-side water storage chamber 101. When the temperature of the oxygen-side generated water is high, it can be cooled by a cooling system to ensure that the temperature of the oxygen-side generated water is maintained within a suitable range, preventing excessive heat from causing the liquid fuel to vaporize. The temperature of the hydrogen-generated water in the hydrogen-side water storage chamber 102 is detected by the second temperature sensor 18. The second temperature sensor 18 is electrically connected to the second valve 46 through the controller. The outflow of water from the hydrogen-side water storage chamber 102 is relatively small. When the second temperature sensor 18 detects that the temperature of the hydrogen-side generated water is low and below the set threshold, it indicates that the heat has been completely transferred to the oxygen-side water storage chamber 101 and the static storage unit 3. At this time, the controller will be triggered to open the second valve 46 to discharge the hydrogen-side generated water with a lower temperature in time, so as to continuously maintain the temperature of the hydrogen-side water storage chamber 102 at a higher level.

[0048] Preferably, in this embodiment, the first valve 45, the second valve 46, the third valve 54, and the fourth valve 55 are all solenoid valves. Of course, in other embodiments, each valve can be other types of controllable valves, such as pneumatic valves or hydraulic valves, depending on the actual application requirements and the overall system design. The use of solenoid valves allows the opening and closing of the valves to be remotely controlled by electrical signals, greatly improving the automation level and ease of operation of the system.

[0049] Secondly, embodiments of the present invention provide a fuel cell-generated water utilization system, including a composite storage device as described in any of the above embodiments. The fuel cell-generated water utilization system further includes a fuel cell system 6. The oxygen-side generated water outlet and the hydrogen-side generated water outlet of the fuel cell system 6 are respectively connected to the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102 of the water storage unit 1. The oxygen-side generated water and hydrogen-side generated water generated by the fuel cell system 6 are effectively separated and stored after entering their respective storage chambers in the composite storage device through their respective outlets. The fuel supply port of the fuel cell system 6 is connected to the dynamic storage unit 2 and the static storage unit 3 to supply hydrogen gas for use by the fuel cell system 6. Simultaneously, the fuel cell system 6 is also provided with an oxygen supply port, through which necessary oxygen can be supplied to the fuel cell system 6 to ensure its normal operation.

[0050] This invention not only ensures a stable and reliable supply of liquid fuel and hydrogen required by the fuel cell system 6, but also fully utilizes the generated water during the operation of the fuel cell system 6, achieving resource recycling and efficient management. Furthermore, this fuel cell generated water utilization system has a simple structure, is easy to maintain, and can significantly improve the overall operating efficiency and reliability of the fuel cell system 6, showing broad application prospects.

[0051] Furthermore, the exhaust port of the fuel cell system 6 is connected to the hydrogen removal reactor 51, allowing the exhaust gas generated by the fuel cell system 6 during operation, including unreacted oxygen and hydrogen, to be promptly introduced into the hydrogen removal reactor 51 for treatment. The hydrogen removal reactor 51 effectively decomposes the hydrogen in the exhaust gas, preventing the direct emission of harmful gases and further improving the environmental performance of the entire system.

[0052] The composite storage device and fuel cell-generated water utilization system provided by this invention include the following steps:

[0053] Step 1: In fuel cell system 6, the oxygen-side generated water produced by the power generation unit flows into the oxygen-side water storage chamber 101. Since the temperature of the generated water in the fuel cell stack is approximately 60 to 70 degrees Celsius, when this water comes into contact with the storage bladder 21, the heat from the generated water can be effectively utilized to heat liquid fuels such as methanol, thereby reducing the heat consumed in the subsequent methanol preheating in fuel cell system 6. Simultaneously, as the methanol fuel is consumed, the volume of the storage bladder 21 gradually decreases, and the space available for storing the generated water in the oxygen-side water storage chamber 101 increases accordingly. This allows the system to continuously store the heated generated water, thereby continuously preheating the methanol fuel.

[0054] Step Two: In fuel cell system 6, the hydrogen-generated water produced by the power generation unit flows into the hydrogen-side water storage chamber 102. Immersing the static storage unit 3 and its related pipelines in the hydrogen-generated water preheats these components, thereby improving the hydrogen storage efficiency of the static storage unit 3. During operation, the thermally conductive baffle 12 isolates the hydrogen side from the oxygen side, preventing unreacted hydrogen and oxygen in the exhaust gas from coming into contact and avoiding potential safety risks. Simultaneously, the thermally conductive baffle 12 also transfers unused heat from the hydrogen side to the oxygen side, effectively utilizing thermal energy and reducing energy loss.

[0055] Step 3: The water level in the oxygen-side water storage chamber 101 is monitored by the first liquid level sensor 13. Once the liquid level in the oxygen-side water storage chamber 101 reaches a certain height, the first valve 45 at the bottom of the water tank 11 opens, discharging the oxygen-side water into the oxygen-side water tank 41. The temperature of the oxygen-side water storage chamber 101 is detected by the first temperature sensor 17 at the top to prevent excessive heat generation from causing liquid fuel vaporization. The tail oxygen content in the generated water in the oxygen-side water storage chamber 101 is monitored by the oxygen concentration sensor 15 at the top. When a certain concentration value is reached, the third valve 54 opens, discharging the tail oxygen into the hydrogen removal reactor 51.

[0056] Step 4: The water level in the hydrogen-side water storage chamber 102 is monitored by the second liquid level sensor 14. Once the liquid level in the hydrogen-side water storage chamber 102 reaches the preset height, the second valve 46 at the bottom of the water tank 11 opens, discharging the hydrogen-side water into the hydrogen-side storage tank. Simultaneously, the second temperature sensor 18 detects the temperature of the hydrogen-side generated water. Due to the limited hydrogen-side storage space, once the generated water temperature drops to a specific threshold, indicating that heat has been completely transferred to the oxygen-side water storage chamber 101 and the hydrogen storage tank, the second valve 46 opens to ensure timely discharge of the cooler hydrogen-side generated water, thereby maintaining the high-temperature state of the hydrogen-side water storage chamber 102. Furthermore, the pressure sensor 16 monitors the pressure value within the hydrogen-side water storage chamber 102. Once the pressure reaches a set level, the fourth valve 55 opens, discharging the tail hydrogen gas into the hydrogen elimination reactor 51.

[0057] Step Six: Oxygen is discharged from the oxygen-side water storage chamber 101, and hydrogen is discharged from the hydrogen-side water storage chamber 102. Both enter the hydrogen removal reactor 51 for further catalytic hydrogen removal treatment. The oxygen-side water storage chamber 101 is monitored and controlled by a concentration sensor, while the hydrogen-side water storage chamber 102 is monitored and controlled by a pressure sensor 16, ensuring that the hydrogen concentration in the hydrogen removal reactor 51 remains above the oxygen concentration. Finally, the generated water in the hydrogen removal reactor 51 enters the hydrogen-side water storage chamber 102, preventing the hydrogen from coming into contact with oxygen and causing a hazard.

[0058] This invention, by setting up a water storage unit 1, a dynamic storage unit 2, and a static storage unit 3, with the dynamic storage unit 2 and the static storage unit 3 respectively located in the oxygen-side water storage chamber 101 and the hydrogen-side water storage chamber 102, ensures that the preheated liquid fuel and the static storage unit 3 are in a water bath state of 60~70℃, effectively utilizing the heat generated during the use of the fuel cell system 6. At the same time, this design also makes full use of the space gaps inside the water storage unit 1, effectively improving space utilization. It can not only effectively separate and store the water generated from different sides of the fuel cell system 6, but also provide a stable and safe environment for the dynamic storage unit 2 and the static storage unit 3.

[0059] The present invention, through the design of the storage bladder 21, can expand or contract accordingly according to the increase or consumption of internal fuel. During operation, as fuel is consumed, the volume of the storage bladder 21 will continuously decrease, while the water generated by the fuel cell system 6 will be continuously discharged to the oxygen-side water storage chamber 101 on its outside, making full use of the space brought by the compression of the storage bladder, so that the oxygen-side fuel loss and the generated water storage reach a dynamic balance.

[0060] This invention integrates the fuel cell fuel compartment and the product collection water tank, enabling the integrated water tank to perform three functions: fuel supply, product water storage, and fuel preheating. It effectively utilizes the heat generated by the power generation device, featuring a rational design, high space utilization, high heat utilization, high safety, and applicability in enclosed environments, making it highly valuable for widespread application. Furthermore, by incorporating multiple sensors and an intelligent control system, the system's automation level and response speed are further enhanced. In addition, the device includes a hydrogen removal reactor 51 and related pipelines, achieving safe treatment and emission of tail oxygen and tail hydrogen, further improving the system's safety and environmental performance.

[0061] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0062] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A composite storage device, characterized in that, include: A water storage unit, wherein a water storage chamber is provided within the water storage unit, and the water storage chamber is used to store the water generated by the fuel cell system; A dynamic storage unit is disposed inside the water storage chamber and is used to store fuel. The dynamic storage unit can expand or contract accordingly based on the increase or consumption of the fuel inside. A static storage unit, disposed within the water storage chamber, is used to store hydrogen fuel; and An isolator is disposed within the water storage chamber to divide the water storage chamber into an oxygen-side water storage chamber and a hydrogen-side water storage chamber, for storing oxygen-side generated water and hydrogen-side generated water of the fuel cell system, respectively; a dynamic storage unit is disposed within the oxygen-side water storage chamber, and a static storage unit is disposed within the hydrogen-side water storage chamber.

2. The composite storage device according to claim 1, characterized in that, The dynamic storage unit includes a storage bladder for storing liquid fuel.

3. The composite storage device according to claim 2, characterized in that, The dynamic storage unit also includes a fixing net that wraps around the storage bladder and is connected to the inner wall of the water storage unit to limit the expansion of the storage bladder during filling and its movement within the water storage cavity.

4. The composite storage device according to claim 1, characterized in that, It also includes an oxygen-side water tank and a hydrogen-side water tank. The oxygen-side water tank is connected to the oxygen-side water storage chamber and is used to store excess oxygen-side generated water in the oxygen-side water storage chamber. The hydrogen-side water tank is connected to the hydrogen-side water storage chamber and is used to store excess hydrogen-side generated water in the hydrogen-side water storage chamber. A first liquid level sensor and a second liquid level sensor are respectively installed in the oxygen-side water storage chamber and the hydrogen-side water storage chamber to detect the water level in the oxygen-side water storage chamber and the hydrogen-side water storage chamber, respectively. When the water level in the oxygen-side water storage chamber is higher than a preset value, excess oxygen-side generated water is discharged into the oxygen-side water tank, and when the water level in the hydrogen-side water storage chamber is higher than a preset value, excess hydrogen-side generated water is discharged into the hydrogen-side water tank.

5. The composite storage device according to claim 1, characterized in that, It also includes a hydrogen elimination reactor, wherein the tail oxygen outlet of the oxygen-side water storage chamber and the tail hydrogen outlet of the hydrogen-side water storage chamber are both connected to the hydrogen elimination reactor; the oxygen-side water storage chamber and the hydrogen-side water storage chamber are respectively equipped with an oxygen concentration sensor and a pressure sensor to detect the oxygen concentration in the oxygen-side water storage chamber and the pressure in the hydrogen-side water storage chamber, respectively. When the oxygen concentration in the oxygen-side water storage chamber is higher than a preset concentration value, the tail oxygen is discharged into the hydrogen elimination reactor for treatment; when the pressure in the hydrogen-side water storage chamber exceeds a preset pressure value, the tail hydrogen is discharged into the hydrogen elimination reactor for treatment.

6. The composite storage device according to claim 1, characterized in that, The oxygen-side water storage chamber and the hydrogen-side water storage chamber are respectively equipped with a first temperature sensor and a second temperature sensor, which are used to monitor the temperature inside the oxygen-side water storage chamber and the hydrogen-side water storage chamber, respectively.

7. A fuel cell-generated water utilization system, characterized in that, The fuel cell water generation system further includes a fuel cell system, wherein the fuel inlet of the fuel cell system is connected to the dynamic storage unit and the water generation outlet of the fuel cell system is connected to the water storage unit.

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