Recovery system and recovery method for diffused hydrogen of hydrogen refueling station

Abstract

The invention discloses a recovery system for diffused hydrogen of a hydrogen refueling station, and the system comprises a filling module which comprises a hydrogen refueling machine and a hydrogen refueling gun which are connected with each other; the recovery port is positioned on a hydrogenation gun of the hydrogen refueling station; an electric energy conversion module is arranged in the electric pile module, the input end of the electric energy conversion module is connected with the recovery port, residual hydrogen in the hydrogenation gun is recovered, and the residual hydrogen is converted into electric energy; the power supply module comprises at least one energy storage module, and the energy storage module is connected with the output end of the electric energy conversion module and stores the electric energy generated by the electric energy conversion module so as to supply power to at least one power utilization end; and the controller is in communication connection with the filling module, the electric pile module and the power supply module so as to control the working process of the whole recovery system. The invention further provides a recovery method for the diffused hydrogen of the hydrogen refueling station. The device and the method have the beneficial effects that the hydrogen remaining in the hydrogenation gun is recycled, the advantages of the hydrogen in the aspect of energy utilization are exerted, and the greenhouse effect generated by hydrogen emission is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen recovery, and in particular to a system and method for recovering hydrogen released from a hydrogen refueling station. Background Art

[0002] Hydrogen energy is regarded as an important energy source for achieving the dual carbon goals because it is zero-carbon, green and efficient. The number of domestic hydrogen refueling stations is increasing. However, some hydrogen will be discharged into the atmosphere when the hydrogen refueling machine is depressurized and released after filling. For example, a common 35MPa hydrogen refueling station discharges about 4m³ of hydrogen into the atmosphere every day under specific conditions, which not only causes waste but also produces a greenhouse effect. Moreover, the flammable and explosive nature of hydrogen poses a safety hazard to hydrogen refueling stations to a certain extent. In the existing technology, mechanical boosting equipment and high-pressure gaseous hydrogen storage equipment are usually set up to recover hydrogen, and the use of hydrogen for power generation and reuse is not considered, so the released hydrogen cannot be fully utilized. Summary of the invention

[0003] In order to solve the above problems, the object of the present invention is to provide a system and method for recovering hydrogen released from a hydrogen refueling station.

[0004] The present invention provides a recovery system for hydrogen released from a hydrogen filling station, comprising: A filling module, comprising a hydrogen filling machine and a hydrogen filling gun connected to each other, wherein the hydrogen filling machine fills hydrogen into the hydrogen fuel cell vehicle through the hydrogen filling gun; A recovery port, located on the hydrogenation gun of the hydrogenation station; The stack module is provided with an electric energy conversion module inside, the input end of the electric energy conversion module is connected to the recovery port, and the electric energy conversion module is used to recover the residual hydrogen inside the hydrogenation gun and convert the residual hydrogen into electric energy; A power supply module, comprising at least one energy storage module, wherein the energy storage module is connected to the output end of the power conversion module, and the energy storage module is used to store the electric energy generated by the power conversion module to supply power to at least one power consumption end; The controller is respectively connected to the filling module, the stack module and the power supply module in communication so as to control the working process of the entire recycling system.

[0005] As a further improvement of the present invention, a control valve is provided on the recovery port, which is communicatively connected with the controller, and the recovery of residual hydrogen is controlled by opening and closing the control valve.

[0006] As a further improvement of the present invention, the hydrogenation gun is further provided with a venting port to vent the residual hydrogen in the hydrogenation gun that does not need to be recovered.

[0007] As a further improvement of the present invention, the stack module further includes an air supply module, a water thermal management module and a water storage tank, which are respectively connected to the electric energy conversion module, wherein: The air supply module includes an air filter and an air compressor to provide oxygen for the electrochemical reaction in the power conversion module; The water thermal management module includes a cooling water system and a cooling water pump to absorb the heat generated by the electrochemical reaction in the power conversion module; The water storage tank is used to store waste water generated by the electrochemical reaction in the electric energy conversion module.

[0008] As a further improvement of the present invention, at least one power supply channel is provided inside the power supply module, and one power supply channel corresponds to one power consumption end.

[0009] As a further improvement of the present invention, each of the power supply channels is provided with a power supply valve, which is communicatively connected with the controller, and supplies power to the corresponding power-consuming end by opening and closing the power supply valve.

[0010] The present invention also provides a method for recovering hydrogen released from a hydrogen refueling station, the method comprising: Determine whether there is residual hydrogen in the hydrogenation gun, and if so, determine whether to recover the residual hydrogen; If it is determined to recover the residual hydrogen, the residual hydrogen is transported to the electric energy conversion module through the recovery port on the hydrogenation gun; The electric energy conversion module converts the residual hydrogen into electric energy and transmits it to the power supply module; The power supply module stores the electric energy generated by the electric energy conversion module to supply power to at least one power consumption end.

[0011] As a further improvement of the present invention, the method further includes, when it is determined that there is no need to recover the residual hydrogen, opening a vent on the hydrogenation gun to release the residual hydrogen.

[0012] As a further improvement of the present invention, the method also includes, before opening the control valve on the recovery port to transport the residual hydrogen to the electric energy conversion module, starting a hydrothermal management module and an air supply module to provide the electric energy conversion module with oxygen required for the electrochemical reaction and absorb the heat generated by the reaction, thereby ensuring the normal progress of the electrochemical reaction in the electric energy conversion module.

[0013] As a further improvement of the present invention, the power supply module supplies power to at least one power-consuming end, including: Determining the power consumption priority of each of the power consumption terminals and judging the amount of stored electric energy; If the stored electric energy is less than the preset power consumption, the power supply valve on the power supply channel corresponding to the power consumption end with the highest priority is opened according to the power consumption priority order; If the stored electric energy is greater than or equal to the preset power consumption, the power supply valves of the power supply channels corresponding to the target power consumption ends are opened simultaneously according to the power consumption priority order. The target power consumption ends are one or more of the multiple power consumption ends, and the target power consumption ends include at least the power consumption end with the highest priority.

[0014] The beneficial effects of the present invention are as follows: by modifying the hydrogenation gun, the recovery port added to the hydrogenation gun is connected to the fuel cell module and the power supply module to form an efficient, closed-loop hydrogen recovery system, which not only efficiently recovers and utilizes the hydrogen remaining between the hydrogenation gun and the hydrogenator, saving hydrogen energy and giving full play to the advantages of hydrogen in energy utilization, but also reduces the greenhouse effect caused by hydrogen emissions and improves the safety level of the hydrogenation station. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0016] Figure 1 It is a structural schematic diagram of a recovery system for hydrogen released from a hydrogen filling station according to an exemplary embodiment of the present invention; Figure 2 It is a schematic structural diagram of a fuel cell module and a power supply module in a recovery system for hydrogen released from a hydrogen filling station according to an exemplary embodiment of the present invention.

[0017] In the figure, 1. Filling module; 2. Fuel cell module; 3. Power supply module; 4. Hydrogen filling machine; 5. Hydrogen filling gun; 6. Release valve; 7. Control valve; 8. Quick connector; 9. Power conversion module; 10. Air filter; 11. Air compressor; 12. Cooling water system; 13. Cooling water pump; 14. Water tank; 15. Energy storage module. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, in the description of the present invention, the terms used are only for illustrative purposes and are not intended to limit the scope of the present invention. The terms "include" and / or "comprise" are used to specify the existence of the elements, steps, operations and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like may be used to describe various elements, do not represent the order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another element. In conjunction with the following drawings, these and / or other aspects become apparent, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments of the present invention. The accompanying drawings are used to describe the embodiments of the present invention for illustrative purposes only. Those skilled in the art will easily recognize from the following description that, without departing from the principles of the present invention, alternative embodiments of the structures and methods shown in the present invention can be adopted.

[0021] like Figure 1 As shown, a system for recovering hydrogen released from a hydrogen filling station according to an embodiment of the present invention comprises: The filling module 1 comprises a hydrogen filling machine 4 and a hydrogen filling gun 5 which are connected to each other. The hydrogen filling machine 4 fills hydrogen into the hydrogen fuel cell vehicle through the hydrogen filling gun 5 .

[0022] A recovery port, located on the hydrogenation gun 5 of the hydrogenation station; The stack module 2 is provided with an electric energy conversion module 9 inside, the input end of the electric energy conversion module 9 is connected to the recovery port, and the electric energy conversion module 9 is used to recover the residual hydrogen inside the hydrogenation gun 5 and convert the residual hydrogen into electric energy; The power supply module 3 includes at least one energy storage module 15, and the energy storage module 15 is connected to the output end of the power conversion module 9. The energy storage module 15 is used to store the electric energy generated by the power conversion module 9 to supply power to at least one power-consuming end; wherein, the number of energy storage modules 15 can be set according to the number of power-consuming ends and the total power consumption. For example, one energy storage module 15 can store 500kwh, and the total power consumption of all power-consuming ends is 2000kwh, then at least four energy storage modules 15 can be set to supply power to the power-consuming ends, and the present application does not make specific restrictions on this.

[0023] The controller is respectively connected to the filling module 1, the stack module 2 and the power supply module 3 in communication so as to control the working process of the entire recycling system.

[0024] The hydrogenator 4 and the hydrogenation gun 5 are connected via a hydrogenation hose, and the recovery port and the electric energy conversion module are connected via a quick-connect connector 8 .

[0025] When the device of the present application is used for work, the hydrogen filling machine 4 is started and hydrogen is added to the hydrogen fuel cell vehicle through the hydrogen filling gun 5. After the hydrogen filling is completed, the hydrogen filling machine 4 is turned off. At this time, there is residual hydrogen inside the hydrogen filling gun 5 and the hydrogen filling hose, and the controller determines whether the residual hydrogen needs to be recovered. When the residual hydrogen needs to be recovered, the recovery port is controlled to open, and the residual hydrogen is sent to the stack module 2. The electric energy conversion module 9 inside it converts the received residual hydrogen into electric energy and then sends it to the power supply module 3. The power supply module 3 first stores the electric energy in the energy storage module 15, and then the controller controls the electric energy to be supplied to the power end as needed.

[0026] This application sets up a filling module 1, a stack module 2 and a power supply module 3 connected in sequence, collects the residual hydrogen in the hydrogenation hose and converts it into electrical energy for power supply, forming an efficient, closed-loop hydrogen recovery system, realizing the recycling and reuse of residual hydrogen, saving hydrogen energy resources, and giving full play to the advantages of hydrogen in energy utilization. Moreover, the effective recovery of residual hydrogen can not only effectively reduce the greenhouse effect caused by hydrogen emissions, but also improve the overall safety level of hydrogen refueling stations, providing a strong guarantee for the safe and sustainable development of the hydrogen energy industry.

[0027] Preferably, the electric energy conversion module 9 is a fuel cell stack.

[0028] In one embodiment, a control valve 7 is provided on the recovery port and is in communication connection with the controller. The recovery of residual hydrogen is controlled by opening and closing the control valve 7 .

[0029] Furthermore, the hydrogenation gun 5 is also provided with a venting port to release the residual hydrogen that does not need to be recovered in the hydrogenation gun 5. Preferably, a venting valve 6 is provided on the venting port, which is in communication connection with the controller, and the release of the residual hydrogen is controlled by opening and closing the venting valve 6.

[0030] Among them, when hydrogen is added to the hydrogen fuel cell vehicle, the controller controls the closing of the control valve 7 and the release valve 6; when the controller determines that the residual hydrogen needs to be recovered, the control valve 7 is controlled to be opened, and the release valve 6 is closed, so that the residual hydrogen enters the electric energy conversion module 9 through the recovery port; when the controller determines that the residual hydrogen does not need to be recovered, the control valve 7 is controlled to be closed, and the release valve 6 is opened to release the residual hydrogen.

[0031] In one embodiment, if Figure 2As shown, the stack module 2 further includes an air supply module, a water thermal management module and a water storage tank 14, which are respectively connected to the power conversion module 9, wherein: The air supply module includes an air filter 10 and an air compressor 11, which provide oxygen for the electrochemical reaction in the power conversion module 9. The air filter 10 can filter various impurities contained in the air to avoid hindering the normal transmission of the gas and the progress of the chemical reaction, thereby affecting the performance and efficiency of the power conversion module 9. Compressing the air through the air compressor 11 can not only allow more oxygen molecules to reach the reaction interface per unit time, promote the redox reaction, and improve the power generation efficiency of the power conversion module 9, but also increase the air supply pressure, thereby increasing the output voltage of the power conversion module 9 and increasing the output power of the power conversion module 9.

[0032] The water thermal management module includes a cooling water system 12 and a cooling water pump 13, which absorb the heat generated by the electrochemical reaction in the power conversion module 9. The water thermal management module can not only maintain the power conversion module 9 within a suitable operating temperature range, but also ensure the stability of the performance of the power conversion module 9 and the service life of the components. It can also ensure that the temperature at different positions inside the power conversion module 9 is relatively uniform, thereby improving the overall performance and reliability of the power conversion module 9.

[0033] Preferably, the optimal operating temperature of the proton exchange membrane in the power conversion module 9 is between 60°C and 80°C, and the controller can maintain the temperature close to this optimal range by controlling the water thermal management module. For example, when the controller detects that the temperature inside the power conversion module 9 is too high, the speed of the cooling water pump 13 can be controlled to be increased to increase the speed of the cooling water system 12 circulating cooling water, so as to quickly absorb the heat generated by the electrochemical reaction and reduce the temperature of the power conversion module 9; when the controller detects that the temperature inside the power conversion module 9 is too low, the speed of the cooling water pump 13 can be controlled to be reduced or the cooling water pump 13 can be turned off to reduce the speed of the cooling water system 12 circulating cooling water, so as to reduce the absorption of the heat generated by the electrochemical reaction and increase the temperature of the power conversion module 9.

[0034] The water storage tank 14 is used to store wastewater generated by the electrochemical reaction in the power conversion module 9, maintain the stability of the reaction environment inside the power conversion module 9, prevent wastewater from flowing freely inside the power conversion module 9 and affecting normal operation, and ensure that the electrochemical reaction inside the power conversion module 9 proceeds continuously and stably.

[0035] Among them, the water amount information in the water tank 14 can indirectly reflect the reaction state and water content inside the power conversion module 9. The controller can adjust the humidity of the reaction gas entering the power conversion module 9 according to the water amount and other information in the water tank 14 to maintain the appropriate water content in the power conversion module 9, thereby ensuring the normal working performance of key components such as the proton exchange membrane. For example, if it is found that there is too much or too little water in the water tank 14, it may mean that there is a problem with the water management in the power conversion module 9, which can be improved by adjusting the humidification degree before the hydrogen or air enters, so as to improve the overall performance and reliability of the power conversion module 9.

[0036] Preferably, the controller controls the waste water in the water storage tank 14 to be discharged after the electrochemical reaction inside the electric energy conversion module 9 is completed. If the controller detects that the amount of water stored in the water storage tank 14 exceeds 90% of its volume during the process of recovering residual hydrogen once, the controller immediately controls the waste water in the water storage tank 14 to be discharged to avoid overflow.

[0037] In one implementation, at least one power supply channel is provided inside the power supply module 3, and one power supply channel corresponds to one power consumption end.

[0038] Furthermore, each of the power supply channels is provided with a power supply valve, which is communicatively connected to the controller, and supplies power to the corresponding power-consuming end by opening and closing the power supply valve.

[0039] The controller supplies power to different power consumption ends according to the amount of power in the energy storage module 15. When the controller detects that there is a lot of power in the energy storage module 15, it can open multiple power supply valves at the same time and control the energy storage module 15 to supply power to multiple power consumption ends with open power supply valves; when the controller detects that there is less power in the energy storage module 15, it can open only one power supply valve to supply power to this power consumption end alone, or it can close all power supply valves and control the opening of power supply to the power consumption end after there is more power in the energy storage module 15. This application does not specifically limit how the energy storage module supplies power to the power consumption end.

[0040] Among them, multiple power consumption terminals can be understood as multiple power consumption demands of users, such as Figure 2 As shown, the electricity demand includes but is not limited to sending DC power to the boost inverter to convert it into AC power for use as lighting and monitoring power in the hydrogen refueling station, charging outdoor mobile power supplies (sodium ion batteries), and powering DC power equipment in the station.

[0041] The present invention also provides a method for recovering hydrogen released from a hydrogen refueling station, the method comprising: Determine whether there is residual hydrogen in the hydrogenation gun, and if so, determine whether to recover the residual hydrogen; If it is determined to recover the residual hydrogen, the residual hydrogen is transported to the electric energy conversion module 9 through the recovery port on the hydrogenation gun 5; The electric energy conversion module 9 converts the residual hydrogen into electric energy and transmits it to the power supply module 3; The power supply module 3 stores the electric energy generated by the electric energy conversion module 9 to supply power to at least one power-consuming end.

[0042] In one embodiment, the method further includes, when it is determined that the residual hydrogen does not need to be recovered, opening a vent on the hydrogenation gun 5 to release the residual hydrogen.

[0043] After determining that there is residual hydrogen inside the hydrogenation gun, the controller first determines whether the residual hydrogen needs to be recovered. When the controller determines that the residual hydrogen needs to be recovered, the control valve 7 is controlled to be opened and the vent valve 6 is closed, so that the residual hydrogen enters the electric energy conversion module 9 through the recovery port to recover the residual hydrogen; and when the controller determines that the residual hydrogen does not need to be recovered, the control valve 7 is controlled to be closed and the vent valve 6 is opened to release the residual hydrogen through the vent port.

[0044] When the controller detects that the energy storage module 15 is fully charged, and the stack module 2 and / or the power supply module 3 are undergoing maintenance or upgrade or have a fault, the residual hydrogen does not need to be recovered. The present application does not limit the specific circumstances in which the residual hydrogen is not recovered.

[0045] In one embodiment, the method further includes, before opening the control valve 7 on the recovery port to transport the residual hydrogen to the power conversion module 9, starting a hydrothermal management module and an air supply module to provide the power conversion module 9 with oxygen required for the electrochemical reaction and absorb the heat generated by the reaction, thereby ensuring the normal progress of the electrochemical reaction in the power conversion module 9.

[0046] Among them, starting the water thermal management module in advance can not only timely take away the heat generated by the electrochemical reaction after the power conversion module 9 is started, so that the temperature is maintained in a relatively stable range, but also make the power conversion module 9 in a relatively stable and low temperature environment before starting, thereby protecting its internal key components, such as proton exchange membranes and catalysts, etc., further ensuring the consistency and reliability of the performance of the power conversion module 9 and extending the service life of the power conversion module 9.

[0047] Starting the air supply module in advance can ensure that the cathode side of the power conversion module 9 has a stable and appropriate oxygen supply when it is turned on. If the air supply starts after startup, it may cause insufficient or unstable oxygen supply in the early stage of the reaction, which will not only affect the performance of the power conversion module 9, but also damage the components of the power conversion module 9 due to abnormal local reactions. In addition, a stable air supply helps to establish a good reaction atmosphere at the moment the power conversion module 9 is started, so that the electrochemical reaction can quickly and smoothly enter a normal state, thereby improving the stability of the power conversion module 9.

[0048] In one embodiment, the method in which the power supply module 3 supplies electric energy on demand to meet different power demands includes: Determining the power consumption priority of each of the power consumption terminals and judging the amount of stored electric energy; If the stored electric energy is less than the preset power consumption, the power supply valve on the power supply channel corresponding to the power consumption end with the highest priority is opened according to the power consumption priority order; after the power supply of the power consumption end with the highest priority is completed, the power supply valve on the power supply channel corresponding to the power consumption end with the second highest priority is opened, and so on; for example, there are 3 power consumption ends in total, and the power consumption priority order is: the first power consumption end > the second power consumption end > the third power consumption end. The power supply valve of the power supply channel corresponding to the first power consumption end is opened first, after the power supply of the first power consumption end is completed, the power supply valve of the power supply channel corresponding to the second power consumption end is opened, and after the power supply of the second power consumption end is completed, the power supply valve of the power supply channel corresponding to the third power consumption end is opened.

[0049] If the stored electric energy is greater than or equal to the preset power consumption, the power supply valves of the power supply channels corresponding to the target power consumption terminals are opened simultaneously according to the power consumption priority order, and the target power consumption terminals are one or more of the multiple power consumption terminals, and the target power consumption terminals at least include the power consumption terminals with the highest priority. For example, there are three power consumption terminals in total, and the power consumption priority order is: the first power consumption terminal> the second power consumption terminal> the third power consumption terminal. The power supply valve of the power supply channel corresponding to the first power consumption terminal can be opened, the power supply valves of the power supply channels corresponding to the first power consumption terminal and the second power consumption terminal can be opened simultaneously, or the power supply valves of the power supply channels corresponding to the first power consumption terminal, the second power consumption terminal and the third power consumption terminal can be opened simultaneously.

[0050] Among them, the preset power consumption can be set according to the number of power consumption terminals and the total power consumption, and this application does not make any specific restrictions on this.

[0051] by Figure 2 The energy storage module 15 shown is connected to three power consumption ends for illustration, and the three power consumption ends are AC power consumption in the station, charging of mobile power supply (sodium ion battery) and DC power consumption in the station, among which the priority of charging of mobile power supply (sodium ion battery) is set to be the highest, the priority of AC power consumption in the station is the second, and the priority of DC power consumption in the station is the lowest. The preset power consumption is set to 50% of the total power stored in the energy storage module 15.

[0052] The controller supplies power to the three power consumption ends respectively according to the amount of electricity in the energy storage module 15. When the amount of electricity in the energy storage module 15 is above 80%, the controller controls the power supply valves of the three power consumption ends to be opened, and the three power consumption ends are powered at the same time; when the amount of electricity in the energy storage module 15 is between 50%-80%, the controller controls the power supply valves corresponding to the mobile power supply (sodium ion battery) charging and the AC power consumption in the station to be opened, and the power supply valve of the DC power consumption in the station is closed, and only the two power consumption ends with higher priority are powered; when the amount of electricity in the energy storage module 15 is between 10%-50%, the controller controls the power supply valve corresponding to the mobile power supply (sodium ion battery) charging to be opened, and the power supply valves of the AC power consumption in the station and the DC power consumption in the station are closed, and only the power consumption ends with higher priority are powered; when the amount of electricity in the energy storage module 15 is less than 10%, the power supply valves of the three power consumption ends are controlled to be closed, and after the amount of electricity in the energy storage module 15 is greater than 10%, the controller controls the power supply valves to be opened to power the power consumption ends. Among them, when charging the mobile power supply (sodium ion battery), when the rated voltage of the mobile power supply is reached, the corresponding power supply valve should be controlled to close and charging should be stopped. At this time, the controller can determine whether to open other power supply valves to continue to supply power to other power consumption ends according to the current power in the energy storage module 15.

[0053] The above content is only an illustrative example, and this application does not specifically limit how the power supply module supplies electrical energy to different power consumption ends on demand.

[0054] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0055] Furthermore, persons of ordinary skill in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0056] It will be appreciated by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be replaced with equivalents without departing from the scope of the present invention. In addition, many modifications may be made to adapt specific situations or materials to the teachings of the present invention without departing from the essential scope of the present invention.

Claims

1. A hydrogen recovery system for hydrogen refueling stations, characterized in that: include: A filling module, comprising a hydrogen filling machine and a hydrogen filling gun connected to each other, wherein the hydrogen filling machine fills hydrogen into the hydrogen fuel cell vehicle through the hydrogen filling gun; A recovery port, located on the hydrogenation gun of the hydrogenation station; The stack module is provided with an electric energy conversion module inside, the input end of the electric energy conversion module is connected to the recovery port, and the electric energy conversion module is used to recover the residual hydrogen inside the hydrogenation gun and convert the residual hydrogen into electric energy; A power supply module, comprising at least one energy storage module, wherein the energy storage module is connected to the output end of the power conversion module, and the energy storage module is used to store the electric energy generated by the power conversion module to supply power to at least one power consumption end; The controller is respectively connected to the filling module, the stack module and the power supply module in communication so as to control the working process of the entire recycling system.

2. The recycling system according to claim 1, characterized in that: The recovery port is provided with a control valve which is in communication connection with the controller, and the recovery of residual hydrogen is controlled by opening and closing the control valve.

3. The recycling system according to claim 1, characterized in that: The hydrogenation gun is also provided with a venting port for venting the residual hydrogen in the hydrogenation gun that does not need to be recovered.

4. The recycling system according to claim 1, characterized in that: The stack module also includes an air supply module, a water thermal management module and a water storage tank, which are respectively connected to the power conversion module, wherein: The air supply module includes an air filter and an air compressor to provide oxygen for the electrochemical reaction in the power conversion module; The water thermal management module includes a cooling water system and a cooling water pump to absorb the heat generated by the electrochemical reaction in the power conversion module; The water storage tank is used to store waste water generated by the electrochemical reaction in the electric energy conversion module.

5. The recycling system according to claim 1, characterized in that: At least one power supply channel is provided inside the power supply module, and one power supply channel corresponds to one power consumption end.

6. The recycling system according to claim 5, characterized in that A power supply valve is provided on each of the power supply channels and is communicatively connected to the controller, and power is supplied to the corresponding power-consuming end by opening and closing the power supply valve.

7. A method for recovering hydrogen gas emitted from a hydrogen refueling station using a recovery system as claimed in any one of claims 1 to 6, characterized in that: The method comprises: Determine whether there is residual hydrogen in the hydrogenation gun, and if so, determine whether to recover the residual hydrogen; If it is determined to recover the residual hydrogen, the residual hydrogen is transported to the electric energy conversion module through the recovery port on the hydrogenation gun; The electric energy conversion module converts the residual hydrogen into electric energy and transmits it to the power supply module; The power supply module stores the electric energy generated by the electric energy conversion module to supply power to at least one power consumption end.

8. The recycling method according to claim 7, characterized in that: The method further includes, when it is determined that the residual hydrogen does not need to be recovered, opening a vent on the hydrogenation gun to release the residual hydrogen.

9. The recycling method according to claim 7, characterized in that: The method also includes, before opening the control valve on the recovery port to transport the residual hydrogen to the electric energy conversion module, starting a hydrothermal management module and an air supply module to provide the electric energy conversion module with oxygen required for the electrochemical reaction and absorb the heat generated by the reaction, thereby ensuring the normal progress of the electrochemical reaction in the electric energy conversion module.

10. The recycling method according to claim 7, characterized in that: The power supply module supplies power to at least one power-consuming end, including: Determining the power consumption priority of each of the power consumption terminals and judging the amount of stored electric energy; If the stored electric energy is less than the preset power consumption, the power supply valve on the power supply channel corresponding to the power consumption end with the highest priority is opened according to the power consumption priority order; If the stored electric energy is greater than or equal to the preset power consumption, the power supply valves of the power supply channels corresponding to the target power consumption ends are opened simultaneously according to the power consumption priority order. The target power consumption ends are one or more of the multiple power consumption ends, and the target power consumption ends include at least the power consumption end with the highest priority.

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