An integrated mobile hydrogen recovery system and method for solid state hydrogen storage

Abstract

The application discloses an integrated mobile hydrogen recovery system and method for solid-state hydrogen storage, relates to the technical field of hydrogen recovery, and provides an integrated mobile hydrogen recovery system for solid-state hydrogen storage, which comprises a first solid-state hydrogen storage module, a second solid-state hydrogen storage module, a temperature control module and a refueling module.

Description

Technical Field

[0001] This invention relates to the field of hydrogen recovery technology, and in particular to an integrated mobile hydrogen recovery system and method for solid-state hydrogen storage. Background Technology

[0002] As a core carrier of clean energy systems, hydrogen energy has become a key focus of global energy efforts in transportation, industry, and other fields. Among these, solid-state hydrogen storage technology, with its advantages of safety and high volumetric hydrogen storage density, has become one of the preferred solutions for hydrogen storage media. With technological advancements, the penetration rate of solid-state hydrogen storage equipment, such as on-board solid-state hydrogen storage tanks for hydrogen-powered vehicles and hydrogen-powered engineering machinery, as well as stationary solid-state hydrogen storage devices, is rapidly increasing in the new energy field, and they are already being used in various scenarios such as ports, mines, and logistics parks.

[0003] However, solid-state hydrogen storage equipment faces the problem of residual hydrogen disposal in actual operation. During actual operation, solid-state hydrogen storage systems require the recovery of residual hydrogen due to shutdowns for maintenance, and switching between operating and idle states (e.g., equipment switching from operational to idle). Because solid-state hydrogen storage alloys have low hydrogen storage pressure, and the hydrogen pressure at the end of hydrogen release is the lowest, residual hydrogen is difficult to remove when there is no heat source and the hydrogen storage volume is small. Currently, the industry generally uses direct venting to handle residual hydrogen, which results in significant resource waste from an economic perspective. From a safety risk perspective, the accumulation of combustible mixtures during hydrogen venting poses a safety hazard. Therefore, developing efficient residual hydrogen recovery and reuse technologies for solid-state storage systems suitable for multiple scenarios is crucial for the development and promotion of the hydrogen energy industry.

[0004] Existing hydrogen recovery solutions, which adapt to the recovery process using gaseous storage, still suffer from limitations in recovery efficiency and safety due to the inherent characteristics of gaseous hydrogen storage. Chinese patent application CN2023106644035 discloses a solution applicable only to high-pressure gaseous residual hydrogen recovery, with its core design revolving around the extraction and compression of high-pressure residual hydrogen. This is unsuitable for recovering low-pressure residual hydrogen within solid-state hydrogen storage systems. Furthermore, Chinese patent application CN202411099995.1 describes hydrogen recovery achieved by heating a solid-state hydrogen storage device, but the recovered hydrogen is stored in a hydrogen buffer tank within the gaseous storage tank. This patent primarily adapts to the fixed-point recovery of residual hydrogen when hydrogen-powered rail trains return to depots, and the subsequent storage and refueling of the recovered hydrogen rely on ground-based fixed hydrogen refueling machines, failing to meet the needs of multi-scenario solid-state storage applications.

[0005] In summary, the field of residual hydrogen recovery needs a highly integrated, mobile hydrogen recovery system that is portable and does not require high-pressure gaseous storage and transportation. This system should be compatible with the low-pressure residual hydrogen characteristics of solid-state hydrogen storage systems, cover the application needs of multiple scenarios, form a closed loop for residual hydrogen utilization, and fill the gaps in existing technologies. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides an integrated mobile hydrogen recovery system and method for solid-state hydrogen storage, applicable to solid-state hydrogen energy equipment. It fundamentally solves problems such as difficulty in recovering residual hydrogen from existing solid-state hydrogen energy equipment, wasteful direct venting with safety hazards, and limited application scenarios.

[0007] The above objectives can be achieved through the following approach: An integrated mobile hydrogen recovery system for solid-state hydrogen storage includes: The first solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure that is lower than the residual hydrogen pressure in the solid-state hydrogen energy equipment to be recycled, and is used to directly connect to and absorb the residual hydrogen in the solid-state hydrogen energy equipment to be recycled. The second solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure higher than that of the first solid-state hydrogen storage module. It is used to receive and centrally store hydrogen and to provide a hydrogen refueling source for external applications. A temperature control module is internally connected to the first solid-state hydrogen storage module and the second solid-state hydrogen storage module, which is used to provide energy for the transfer of hydrogen between different hydrogen storage modules and to achieve compressor-free pressurization of hydrogen by heating. A refueling module, which is connected to the second solid-state hydrogen storage module, is used to refuel the hydrogen released by the second solid-state hydrogen storage module into the hydrogen-using equipment as needed.

[0008] Optionally, the specific structures of the first and second solid-state hydrogen storage modules are as follows: the first solid-state hydrogen storage module includes a hydrogen storage alloy system, a low-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a quick-connect connector; the second solid-state hydrogen storage module includes a hydrogen storage alloy tank, a high-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a thermal insulation layer.

[0009] Optionally, the specific structures of the temperature control module and the refueling module are as follows: the temperature control module includes a refrigeration unit, a heating unit, a circulating pump, and a temperature monitoring and control element, and is internally connected to the first solid hydrogen storage module and the second solid hydrogen storage module through heat exchange coils respectively; the refueling module includes a one-way valve, a filter, a mass flow meter, a pressure reducing valve, and a hydrogen refueling gun connected in sequence.

[0010] Optionally, it also includes a gas path valve assembly and detection instruments for automated scheduling: the gas path valve assembly includes an explosion-proof electric valve for controlling gas path connection, the explosion-proof electric valve includes a first valve, a second valve and a third valve; the detection instruments include a first pressure sensor, a second pressure sensor and a third pressure sensor for detecting the pressure of the equipment to be recovered, the second solid hydrogen storage module and the first solid hydrogen storage module respectively.

[0011] Optionally, a safety protection and control module for safety protection is also included: the safety protection and control module includes a PLC control cabinet, a touch screen, a hydrogen leak detector, an emergency stop button, an explosion-proof exhaust fan, and an audible and visual alarm device; the PLC control cabinet connects to and collects signals from all the detection instruments to achieve automatic control, and controls the automatic opening and closing of the first valve, the second valve, and the third valve.

[0012] Optionally, the entire system is supported on a corrosion-resistant and rust-proof steel skid platform, which is equipped with lifting points, moving rollers, and forklift slots.

[0013] Optionally, the first solid-state hydrogen storage module is filled with a low plateau pressure hydrogen storage alloy, wherein the low plateau pressure hydrogen storage alloy is a TiFe-based alloy; the second solid-state hydrogen storage module is filled with a high plateau pressure hydrogen storage alloy, wherein the high plateau pressure hydrogen storage alloy is a TiMn2-based alloy.

[0014] The present invention also provides a recovery control method for the above-mentioned hydrogen recovery system, characterized by comprising the following steps: Step 1: Connect the solid hydrogen energy equipment containing the hydrogen to be recovered to the gas inlet of the system using a quick-connect fitting; Step 2: Initial recovery stage, the residual hydrogen in the equipment to be recovered is directly charged into the second solid hydrogen storage module; Step 3: Deep recovery stage, the residual hydrogen in the equipment to be recovered is charged into the first solid hydrogen storage module and absorbed by the alloy in the first solid hydrogen storage module; Step 4: Hydrogen transfer stage. The heating unit of the temperature control module is activated to heat up the first solid hydrogen storage module, causing the hydrogen inside to be released and automatically filled into the second solid hydrogen storage module for storage. Step 5: During the refueling stage, the temperature control module heats up the second solid-state hydrogen storage module to regulate the hydrogen release pressure. The released hydrogen is then processed by the refueling module and refueled through the hydrogen refueling gun.

[0015] Optionally, in step two, the preliminary recovery control steps are as follows: the PLC collects pressure values ​​in real time, and when it is determined that the pressure value of the first pressure sensor is greater than the pressure values ​​of the second and third pressure sensors, the first valve and the second valve are automatically opened to perform preliminary recovery.

[0016] Optionally, in step three, the deep recovery control steps are as follows: when it is determined that the pressure value of the first pressure sensor is equal to the pressure value of the second pressure sensor, and is still greater than the pressure value of the third pressure sensor, the second valve is automatically closed and the third valve is opened; until the pressure value of the pipeline where the first valve is located is equal to the pressure value of the third pressure sensor, the first valve and the third valve are automatically closed to complete the deep recovery.

[0017] Optionally, in step four, the hydrogen transfer step is as follows: after heating the first solid-state hydrogen storage module, when the PLC determines that the pressure value of the third pressure sensor is greater than the pressure value of the second pressure sensor, the hydrogen in the first solid-state hydrogen storage module is filled into the second solid-state hydrogen storage module; until the pressure values ​​of the third pressure sensor and the second pressure sensor are balanced, the temperature control module stops heating, completing the centralized transfer and storage of hydrogen.

[0018] Compared with the prior art, the present invention has the following advantages: This invention recovers residual hydrogen from solid-state hydrogen storage systems using low-pressure hydrogen storage alloys, avoiding direct venting and improving hydrogen utilization through hydrogen recovery; it achieves hydrogen pressurization and refueling through different hydrogen storage alloys, resulting in low energy consumption; it uses solid-state hydrogen storage alloys throughout the process, eliminating high-pressure gaseous storage and transportation links, thus ensuring high safety performance; and it is integrated into a skid-mounted platform, making it mobile to various solid-state hydrogen storage system application scenarios. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the system flow in this invention; Figure 2 This is a schematic diagram of the hydrogen recovery process in the system of this invention.

[0021] Explanation of reference numerals in the attached figures: 1. Quick-connect fitting; 2. First pressure sensor; 3. First valve; 4. Second valve; 5. Second pressure sensor; 6. Third valve; 7. Third pressure sensor; 8. Check valve; 9. Filter; 10. Mass flow meter; 11. Pressure reducing valve; 12. Hydrogen refueling nozzle. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] 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.

[0024] This embodiment provides an integrated mobile hydrogen recovery system for solid-state hydrogen storage, including: The first solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure that is lower than the residual hydrogen pressure in the solid-state hydrogen energy equipment to be recycled, and is used to directly connect to and absorb the residual hydrogen in the solid-state hydrogen energy equipment to be recycled. The second solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure that is higher than that of the first solid-state hydrogen storage module. It is used to receive and centrally store hydrogen and to provide a hydrogen refueling source for external applications. The temperature control module is internally connected to the first solid-state hydrogen storage module and the second solid-state hydrogen storage module. It is used to provide energy for the transfer of hydrogen between different hydrogen storage modules and to achieve compressor-free pressurization of hydrogen by heating. The refueling module is connected to the second solid-state hydrogen storage module and is used to refuel the hydrogen released from the second solid-state hydrogen storage module to the hydrogen-using equipment as needed.

[0025] This system primarily addresses the problem of residual hydrogen being difficult to handle during shutdowns or changes in operating conditions in existing solid-state hydrogen energy equipment, such as hydrogen-powered vehicles and engineering machinery, leading to resource waste and safety hazards due to direct venting. The system abandons the traditional high-energy-consumption, high-failure-rate solution relying on mechanical hydrogen compressors. Instead, it innovatively sets up a first and a second solid-state hydrogen storage module with different hydrogen absorption and desorption platform pressures. The first solid-state module, with its lower absorption and desorption platform pressure, can directly connect to and spontaneously absorb low-pressure residual hydrogen from the equipment to be recycled. Subsequently, a temperature control module provides heat to the internal hydrogen storage alloy through heat exchange, utilizing the alloy's temperature-pressure correlation characteristics to pressurize the hydrogen, thereby transferring it without compressors to the second solid-state hydrogen storage module with its higher platform pressure for centralized storage. Finally, a refueling module adds high-purity hydrogen from the second solid-state hydrogen storage module to the hydrogen-using equipment as needed, achieving a perfect closed loop for residual hydrogen recovery, storage, and reuse.

[0026] Optionally, the specific structures of the first and second solid-state hydrogen storage modules are as follows: the first solid-state hydrogen storage module includes a hydrogen storage alloy system, a low-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a quick-connect connector 1; the second solid-state hydrogen storage module includes a hydrogen storage alloy tank, a high-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a thermal insulation layer.

[0027] To ensure safe operation of hydrogen storage, both the first and second solid-state hydrogen storage modules feature specialized structural designs. The first module contains a low-plateau-pressure hydrogen storage alloy system and is filled with this alloy. Externally, it has a quick-connect connector 1 for easy docking with the equipment to be recovered. It is also equipped with a safety relief valve and pressure and temperature sensors for real-time monitoring of the module's internal status. The second module contains a high-pressure hydrogen storage alloy tank filled with high-plateau-pressure hydrogen storage alloy, and is similarly equipped with a safety relief valve and temperature and pressure sensors. Specifically considering that the second module is responsible for centralized storage and external refueling, it is specially covered with a thermal insulation layer to effectively reduce external environmental interference with the internal temperature and prevent drastic pressure fluctuations.

[0028] Optionally, the specific structures of the temperature control module and the refueling module are as follows: The temperature control module includes a refrigeration unit, a heating unit, a circulating pump, and temperature monitoring and control elements, and is internally connected to the first solid hydrogen storage module and the second solid hydrogen storage module through heat exchange coils respectively; The refueling module includes a one-way valve 8, a filter 9, a mass flow meter 10, a pressure reducing valve 11, and a hydrogen refueling gun 12 connected in sequence.

[0029] In this embodiment, the temperature control module is the core power source for achieving hydrogen "thermal pressurization." It integrates a refrigeration unit, a heating unit, a circulating pump, and temperature monitoring and control components. The temperature control module, via heat exchange coils, extends deep into the alloy beds of the first and second solid-state hydrogen storage modules, enabling precise cooling to promote hydrogen absorption or heating to promote hydrogen release for each module. The piping design of the refueling module fully considers the safety and purity requirements of hydrogen refueling. At the outlet of the second solid-state hydrogen storage module, a one-way valve 8 to prevent backflow, a filter 9 to ensure hydrogen purity, a mass flow meter 10 for precise measurement, and a pressure reducing valve 11 to adjust the high-pressure hydrogen to the appropriate pressure are connected in series, finally connecting to the hydrogen refueling gun 12 to perform the refueling operation.

[0030] Optionally, it also includes a gas path valve assembly and detection instruments for automated scheduling: the gas path valve assembly includes explosion-proof electric valves for controlling gas path connection, the explosion-proof electric valves include a first valve 3, a second valve 4 and a third valve 6; the detection instruments include a first pressure sensor 2, a second pressure sensor 5 and a third pressure sensor 7 for detecting the pressure of the equipment to be recovered, the second solid hydrogen storage module and the first solid hydrogen storage module respectively.

[0031] Optionally, a safety protection and control module for safety protection is also included: the safety protection and control module includes a PLC control cabinet, a touch screen, a hydrogen leak detector, an emergency stop button, an explosion-proof exhaust fan, and an audible and visual alarm device; the PLC control cabinet connects to and collects signals from all the detection instruments to achieve automatic control, and controls the automatic opening and closing of the first valve 3, the second valve 4, and the third valve 6.

[0032] To achieve fully automated and unattended operation, this system is equipped with a complete set of gas valve assemblies, detection instruments, and safety protection control modules. The gas path includes three valves: a first valve (3), a second valve (4), and a third valve (6), all of which are explosion-proof electric valves to prevent electrical sparks from causing danger. The detection instruments include three core pressure sensors: a first pressure sensor (2) monitors the pressure of the equipment to be recovered, a second pressure sensor (5) monitors the pressure of the second solid-state hydrogen storage module, and a third pressure sensor (7) monitors the pressure of the first solid-state hydrogen storage module. The system's central control unit is a PLC control cabinet that interacts with a touchscreen, acquiring signals from all sensors in real time and automatically controlling the opening and closing of the electric valves. In addition, the system is equipped with a hydrogen leak detector, an emergency stop button, an explosion-proof exhaust fan, and an audible and visual alarm device. Once a hydrogen leak or abnormal overpressure is detected, the PLC can immediately shut off the valves, start the exhaust fan, and trigger an audible and visual alarm, fully meeting the safety operation requirements of hydrogen energy sites.

[0033] Optionally, the entire system is supported on a corrosion-resistant and rust-proof steel skid platform, which is equipped with lifting points, moving rollers, and forklift slots.

[0034] Unlike traditional solutions that rely on fixed ground-based hydrogen refueling units, this invention integrates all core modules, pipelines, and control cabinets, all mounted on a corrosion-resistant and rust-proof steel skid-mounted platform. The pipelines for each module are short and efficient, and the entire system does not store high-pressure gaseous hydrogen, ensuring extremely high safety. The skid-mounted platform is structurally designed with pre-installed lifting points, moving rollers, and forklift slots, and its overall dimensions perfectly accommodate the transport requirements of standard 20-foot containers. This design allows the system to be easily moved by trailer to various solid-state hydrogen storage equipment sites such as ports, mines, and logistics parks, enabling flexible mobile, on-site, or accompanying services.

[0035] Optionally, the first solid-state hydrogen storage module is filled with a low-plateau-pressure hydrogen storage alloy, which is a TiFe-based alloy; the second solid-state hydrogen storage module is filled with a high-plateau-pressure hydrogen storage alloy, which is a TiMn2-based alloy.

[0036] The first solid-state hydrogen storage module is preferably filled with a TiFe-based alloy as the low-plateau-pressure hydrogen storage medium, which possesses excellent low-temperature hydrogen absorption and low-pressure hydrogen storage characteristics, capable of completely removing the extremely low-pressure tail hydrogen within the equipment to be recovered. The second solid-state hydrogen storage module is preferably filled with a TiMn2-based alloy of matching volume as the high-plateau-pressure hydrogen storage medium. Its plateau pressure at the same temperature is significantly higher than that of the TiFe-based alloy, resulting in not only a larger hydrogen storage capacity but also the ability to rapidly establish high pressure after heating to meet refueling requirements. Furthermore, considering the phase change thermodynamic requirements of the aforementioned alloys, the preferred configuration for the temperature control module is a 10kW cooling capacity and a 15kW heating power. This parameter configuration perfectly adapts to the rapid recovery and refueling rhythm of hydrogen-powered forklifts, heavy trucks, and other equipment.

[0037] The present invention also provides a recovery control method for the above-mentioned hydrogen recovery system, characterized by comprising the following steps: Step 1: Connect the solid hydrogen energy equipment containing the hydrogen to be recovered to the gas inlet of the system via quick-connect connector 1. Step 2: Initial recovery stage, the remaining hydrogen in the equipment to be recovered is directly charged into the second solid-state hydrogen storage module; Step 3: Deep recovery stage, the residual hydrogen in the equipment to be recovered is charged into the first solid hydrogen storage module and absorbed by the alloy in the first solid hydrogen storage module; Step 4: Hydrogen transfer stage. The heating unit of the temperature control module is activated to heat up the first solid hydrogen storage module, causing the hydrogen inside to be released and automatically filled into the second solid hydrogen storage module for storage. Step 5: During the refueling stage, the temperature control module heats up the second solid hydrogen storage module to regulate the hydrogen release pressure. The released hydrogen is then processed by the refueling module and refueled through the hydrogen refueling gun 12.

[0038] Optionally, in step two, the preliminary recovery control steps are as follows: The PLC collects pressure values ​​in real time. When it is determined that the pressure value of the first pressure sensor 2 is greater than the pressure values ​​of the second pressure sensor 5 and the third pressure sensor 7, the first valve 3 and the second valve 4 are automatically opened to perform preliminary recovery.

[0039] Optionally, in step three, the deep recovery control steps are as follows: when it is determined that the pressure value of the first pressure sensor 2 is equal to the pressure value of the second pressure sensor 5, and is still greater than the pressure value of the third pressure sensor 7, the second valve 4 is automatically closed and the third valve 6 is opened; until the pressure value of the pipeline where the first valve 3 is located is equal to the pressure value of the third pressure sensor 7, the first valve 3 and the third valve 6 are automatically closed to complete the deep recovery.

[0040] Optionally, in step four, the hydrogen transfer steps are as follows: after heating the first solid-state hydrogen storage module, when the PLC determines that the pressure value of the third pressure sensor 7 is greater than the pressure value of the second pressure sensor 5, the hydrogen in the first solid-state hydrogen storage module is filled into the second solid-state hydrogen storage module; until the pressure values ​​of the third pressure sensor 7 and the second pressure sensor 5 are balanced, the temperature control module stops heating, completing the centralized transfer and storage of hydrogen.

[0041] Based on the aforementioned system hardware, in the first connection stage, the operator connects the equipment to be recycled to quick-connect connector 1 and confirms that the PLC and all detection instruments are working properly. Then, in the second preliminary recycling stage, the PLC collects system pressure data in real time. When the first pressure sensor 2 detects that the pressure inside the equipment to be recycled is still at a high level, i.e., greater than the values ​​of the second sensor 5 and the third sensor 7, the PLC automatically opens the first valve 3 and the second valve 4. At this time, the high-pressure residual hydrogen, following the natural pressure difference, directly and quickly fills the second solid-state hydrogen storage module, which serves as the main storage unit, completing the initial high-flow-rate recycling. As recycling progresses, the pressure inside the equipment to be recycled decreases, entering the third deep recycling stage. When the value of the first pressure sensor 2 drops to be equal to that of the second pressure sensor 5, but still greater than that of the third pressure sensor 7, the high-pressure transfer stops. At this point, the PLC automatically closes the second valve 4 and opens the third valve 6. The remaining low-pressure tail hydrogen is introduced into the first solid-state hydrogen storage module under pressure differential drive, where it is deeply absorbed by the TiFe alloy until the pressure in the first valve 3 pipeline balances with the pressure in the third sensor 7. The remaining hydrogen is completely "squeezed out," and the relevant valves automatically close. To free up space in the first module and centrally store the hydrogen, the process enters the fourth hydrogen transfer stage. The PLC instructs the heating unit of the temperature control module to heat the first solid-state hydrogen storage module, for example, using 15kW of power. As the temperature rises, the hydrogen release pressure of the TiFe alloy increases sharply. When the value of the third pressure sensor 7 exceeds that of the second pressure sensor 5, the hydrogen spontaneously transfers to the second solid-state hydrogen storage module. When the pressures of the two modules balance again, the transfer is complete, and the temperature control module stops heating. Finally, in the fifth refueling stage, when external hydrogen-using equipment needs to be refueled, the temperature control module heats the TiMn2 alloy of the second solid-state hydrogen storage module to reach the target refueling pressure. High-purity hydrogen flows sequentially through a one-way valve, filter, flow meter, and pressure reducing valve, and is then smoothly injected into the target vehicle through the hydrogen refueling gun 12, completing the efficient conversion of exhaust gas into fuel.

[0042] It should be noted that the electrical connections between the various units described above do not necessarily represent direct or indirect connections. Any indirect connection method is applicable to the embodiments of the present invention as long as it achieves the purpose of the present invention. The above are merely exemplary embodiments of the present invention and should not be construed as limiting the scope of the present invention.

[0043] All equivalent changes and modifications made in accordance with the teachings of this invention are still within the scope of this invention. Those skilled in the art will readily conceive of other embodiments of this invention upon considering the specification and the disclosure of practical truth. This application is intended to cover any variations, uses, or adaptations of this invention that follow the general principles of this invention and include common knowledge or conventional techniques in the art not described herein.

Claims

1. An integrated mobile hydrogen recovery system for solid-state hydrogen storage, characterized in that, include: The first solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure that is lower than the residual hydrogen pressure in the solid-state hydrogen energy equipment to be recycled, and is used to directly connect to and absorb the residual hydrogen in the solid-state hydrogen energy equipment to be recycled. The second solid-state hydrogen storage module has a hydrogen absorption and desorption platform pressure higher than that of the first solid-state hydrogen storage module. It is used to receive and centrally store hydrogen and to provide a hydrogen refueling source for external applications. A temperature control module is internally connected to the first solid-state hydrogen storage module and the second solid-state hydrogen storage module, which is used to provide energy for the transfer of hydrogen between different hydrogen storage modules and to achieve compressor-free pressurization of hydrogen by heating. A refueling module, which is connected to the second solid-state hydrogen storage module, is used to refuel the hydrogen released by the second solid-state hydrogen storage module into the hydrogen-using equipment as needed.

2. The system according to claim 1, characterized in that, The specific structures of the first and second solid-state hydrogen storage modules are as follows: The first solid-state hydrogen storage module includes a hydrogen storage alloy system, a low-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a quick-connect connector; The second solid-state hydrogen storage module includes a hydrogen storage alloy tank, a high-plateau-pressure hydrogen storage alloy filled therein, a safety relief valve, a pressure sensor, a temperature sensor, and a thermal insulation layer.

3. The system according to claim 1, characterized in that, The specific structures of the temperature control module and the refueling module are as follows: The temperature control module includes a refrigeration unit, a heating unit, a circulating pump, and a temperature monitoring and control element, and is internally connected to the first solid hydrogen storage module and the second solid hydrogen storage module through heat exchange coils respectively; The refueling module includes a one-way valve, a filter, a mass flow meter, a pressure reducing valve, and a hydrogen refueling gun connected in sequence.

4. The system according to claim 1, characterized in that, It also includes a gas path valve assembly and detection instruments for automated scheduling: the gas path valve assembly includes an explosion-proof electric valve for controlling gas path connection, the explosion-proof electric valve includes a first valve, a second valve and a third valve; the detection instruments include a first pressure sensor, a second pressure sensor and a third pressure sensor for detecting the pressure of the equipment to be recovered, the second solid hydrogen storage module and the first solid hydrogen storage module respectively.

5. The system according to claim 4, characterized in that, It also includes a safety protection and control module for safety protection: the safety protection and control module includes a PLC control cabinet, a touch screen, a hydrogen leak detector, an emergency stop button, an explosion-proof exhaust fan, and an audible and visual alarm device; the PLC control cabinet connects to and collects signals from all the detection instruments to achieve automatic control, and controls the automatic opening and closing of the first valve, the second valve, and the third valve.

6. The system according to claim 2 or 3, characterized in that, The first solid-state hydrogen storage module is filled with a low plateau pressure hydrogen storage alloy, which is a TiFe-based alloy; the second solid-state hydrogen storage module is filled with a high plateau pressure hydrogen storage alloy, which is a TiMn2-based alloy.

7. A method for controlling residual hydrogen recovery based on the system described in claim 5, characterized in that, Includes the following steps: Step 1: Connect the solid hydrogen energy equipment containing the hydrogen to be recovered to the gas inlet of the system using a quick-connect fitting; Step 2: Initial recovery stage, the residual hydrogen in the equipment to be recovered is directly charged into the second solid hydrogen storage module; Step 3: Deep recovery stage, the residual hydrogen in the equipment to be recovered is charged into the first solid hydrogen storage module and absorbed by the alloy in the first solid hydrogen storage module; Step 4: Hydrogen transfer stage. The heating unit of the temperature control module is activated to heat up the first solid hydrogen storage module, causing the hydrogen inside to be released and automatically filled into the second solid hydrogen storage module for storage. Step 5: During the refueling stage, the temperature control module heats up the second solid-state hydrogen storage module to regulate the hydrogen release pressure. The released hydrogen is then processed by the refueling module and refueled through the hydrogen refueling gun.

8. The method according to claim 7, characterized in that, In step two, the specific preliminary recovery control steps are as follows: The PLC collects pressure values ​​in real time. When it is determined that the pressure value of the first pressure sensor is greater than the pressure values ​​of the second and third pressure sensors, the first and second valves are automatically opened to perform preliminary recovery.

9. The method according to claim 7, characterized in that, In step three, the specific deep recovery control steps are as follows: when the pressure value of the first pressure sensor is equal to the pressure value of the second pressure sensor, and is still greater than the pressure value of the third pressure sensor, the second valve is automatically closed and the third valve is opened; until the pressure value of the pipeline where the first valve is located is equal to the pressure value of the third pressure sensor, the first valve and the third valve are automatically closed to complete the deep recovery.

10. The method according to claim 7, characterized in that, In step four, the specific hydrogen transfer steps are as follows: After heating the first solid-state hydrogen storage module, when the PLC determines that the pressure value of the third pressure sensor is greater than the pressure value of the second pressure sensor, the hydrogen in the first solid-state hydrogen storage module is filled into the second solid-state hydrogen storage module; until the pressure values ​​of the third pressure sensor and the second pressure sensor are balanced, the temperature control module stops heating, completing the centralized transfer and storage of hydrogen.

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