Hydrogen supply system, method and hydrogen-operated drive

Abstract

The invention relates to a hydrogen supply system for a hydrogen-operated drive of a consumer, in particular a motor vehicle, in particular a fuel cell system having a fuel cell or a fuel cell stack, having at least one hydrogen tank, the hydrogen storage device is used for storing hydrogen at low temperature and supplying the hydrogen operation type driver; a hydrogen supply line between the at least one hydrogen tank and an interface for attachment to the hydrogen-operated drive, the hydrogen supply line having a first line section, which is arranged in the at least one hydrogen tank, and a second line section, which is arranged in the at least one hydrogen tank, the second line section is arranged outside the at least one hydrogen tank; and a first valve, in particular a first valve which opens without current, for switching on and off a hydrogen supply, the first line section having a pressure equalization line in which the first valve of the first line section is arranged.

Description

Technical Field

[0001] The invention relates to a hydrogen supply system, a method for pressure regulation in a hydrogen tank of a hydrogen supply system, and a hydrogen-operated drive. Background Art

[0002] In order to decarbonize the mobility sector, the introduction of hydrogen-powered vehicles is currently being strongly promoted. For example, for the use of long-distance trucks, hydrogen is stored in liquid form at low temperatures and moderate pressures. However, in this system, the relatively low storage pressure creates the need to maintain this pressure during operation. This is achieved in practice in the following way: the hydrogen is vaporized in the hydrogen tank by heat beforehand. If the hydrogen is extracted as gaseous hydrogen, a very high heating power is required so that the extracted volume can be replaced by vaporization. Therefore, it is more advantageous in terms of energy to extract the hydrogen in liquid form, so that the volume that needs to be replaced in order to maintain the pressure in the hydrogen tank is significantly smaller. Typically, a riser is used to transport the cryogenic liquid in liquid form. Here, the riser is lowered into the liquid of at least one hydrogen tank. Due to the pressure difference between the inside of the tank and the consumer, the liquid can be pressed out of the hydrogen tank via the riser.

[0003] The problem here is that the installed components, such as valves, in particular, installed in the riser or hydrogen line need to withstand the cryogenic temperatures of hydrogen and the extreme temperature fluctuations of 20 K to 300 K, in particular of liquid hydrogen. At the same time, these installed components or valves must be robust and simple to manufacture, since they are difficult to access once installed in the hydrogen tank. Therefore, the design and manufacture of such installed components are very cost-intensive. Summary of the invention

[0004] The above-mentioned object is achieved by the hydrogen supply system according to the invention, by the method according to the invention and by the hydrogen-operated drive according to the invention. Further features and details of the invention are apparent from the description and the drawings. Features and details described in the context of the hydrogen supply system according to the invention are of course also applicable in the context of the method according to the invention and / or in the context of the hydrogen-operated drive according to the invention, and vice versa, respectively, so that reference is always made to one another or can be made to one another with regard to the disclosure of the individual inventive aspects.

[0005] The first aspect of the present invention is a hydrogen supply system for a hydrogen-operated drive of a consumer (Abnehmer). Here, the hydrogen-operated drive can be, for example, a fuel cell system having a fuel cell or a fuel cell stack. Here, the consumer can be a motor vehicle in particular. The hydrogen supply system has at least one hydrogen tank and a hydrogen supply line between at least one hydrogen tank and an interface for attaching to the hydrogen-operated drive, the hydrogen tank being used to store hydrogen at low temperatures and for supplying the hydrogen-operated drive. Here, the hydrogen supply line has a first line section and a second line section, wherein the first line section is arranged in at least one hydrogen tank, and the second line section is arranged outside at least one hydrogen tank. In addition, the hydrogen supply system has a first valve, which is used to turn on and off hydrogen delivery. Preferably, the first valve can be a valve that opens in the absence of current. Here, the first line section has a pressure balance line, wherein the first valve of the first line section is arranged in the pressure balance line of the first line section.

[0006] In general, the arrangement of the first valve in the pressure balance line has a particularly favorable effect on the costs for manufacturing the valve or the costs for purchasing the valve. Liquid hydrogen and gaseous hydrogen are in the hydrogen tank, wherein the pressure balance line is arranged on the first line section in such a way that the pressure balance line is located in the area of ​​the gaseous hydrogen. This ensures that gaseous hydrogen is present in the pressure balance line and accordingly also in the first valve. The valve itself is used to constantly transport liquid hydrogen during consumption by the consumer. Usually, in order to transport hydrogen, the hydrogen is vaporized in at least one hydrogen tank. When the first valve is closed, liquid hydrogen rises from the at least one hydrogen tank through the first line section of the hydrogen supply line and reaches the interface via the second line section of the hydrogen supply line and reaches the hydrogen-operated drive of the consumer via the interface.

[0007] Since the first valve is not traversed by liquid hydrogen but only by gaseous hydrogen, the first valve can be designed to be significantly smaller. At the same time, the material of the first valve does not need to withstand the strong temperature fluctuations of 20K to 300K of liquid hydrogen, so that more favorable materials can also be used to produce the first valve.

[0008] Since the first valve no longer has to withstand these temperature fluctuations, the maintenance intervals of the hydrogen tank can also be configured differently, so that further time and cost savings result here.

[0009] Within the scope of the invention, it can be advantageous if the first valve is a solenoid valve.

[0010] The advantage of solenoid valves is that they can be easily switched to a de-energized state. In the present case, "switching to a de-energized state" of the first valve is understood to mean that the first valve, in particular the first valve designed as a solenoid valve, can be opened, during which the valve is no longer supplied with current. Accordingly, in the case of a solenoid valve, the attraction of the magnet can be interrupted by switching to a de-energized state, so that the opening of the valve can be configured to be simple.

[0011] Within the scope of the invention, it is conceivable that the first line section is designed as a vacuum-isolated transfer siphon.

[0012] The vacuum-insulated transfer siphon acts like a suction tube or a riser. Accordingly, a portion of the first line section is lowered into the liquid, i.e., liquid hydrogen, and due to the pressure difference between the interior of the hydrogen tank and the pressure in the second line section or at the hydrogen-operated drive, the liquid hydrogen is pressed from the hydrogen tank in the direction of the consumer and thus removed. This is a simple and cost-effective way of conveying liquid hydrogen to the consumer.

[0013] Within the scope of the invention, it can be provided that a nonreturn valve is arranged in the second line section of the hydrogen supply line.

[0014] This is particularly advantageous because the hydrogen supply system is closed when there is no pressure for delivery. The nonreturn valve is therefore either closed by the control device or automatically closed due to the pressure difference that occurs when the first valve is opened, so that there is no pressure in the first line section. If this is the case, liquid hydrogen flows back from the first line section into the hydrogen tank.

[0015] In this case, a very low opening pressure can be selected for the design of the nonreturn valve, since the pressure outside the hydrogen tank will automatically continue to build up during longer idle phases, for example during stationary operation, due to increased temperatures, so that the nonreturn valve is additionally blocked.

[0016] Furthermore, it is conceivable to provide a pressure relief valve in the second line section of the hydrogen supply line.

[0017] This is also advantageous because the pressure relief valve of the hydrogen supply system is closed when there is no pressure for delivering liquid hydrogen from the at least one hydrogen tank to the consumer. Here, the pressure relief valve is closed when the first valve is open. At the same time, the pressure relief valve can be configured as a safety valve so that when there is an overpressure in the hydrogen supply system, pressure relief can be achieved so that pressure equalization can be performed.

[0018] Advantageously, the pressure relief valve can be arranged downstream of the non-return valve in the flow direction of hydrogen to the consumer. This can also increase the safety of the entire hydrogen supply system.

[0019] It is also conceivable to provide a control unit for regulating and / or controlling the hydrogen supply system.

[0020] By means of the control unit, the first valve can be controlled and / or regulated in order to carry out the delivery of hydrogen from at least one hydrogen tank. At the same time, the control unit can have a comparison unit in order to obtain data from at least one hydrogen tank or a hydrogen supply system and compare the data and thus control and / or regulate the first valve.

[0021] The control unit can be connected in data communication with an interface for connecting the hydrogen supply system to the hydrogen-operated drive in order to thus detect data of the hydrogen-operated drive or of the consumer.

[0022] Within the scope of the present invention, it is optionally possible that at least one pressure sensor is provided in at least one hydrogen tank, which serves to ascertain the pressure in the hydrogen tank.

[0023] The data of the pressure sensor can be detected and further processed by means of the control unit or its comparison unit. Based on the pressure in the hydrogen supply system, the hydrogen supply can be adjusted and / or controlled. Therefore, the first valve can be opened or closed by the control unit according to the pressure in the hydrogen supply system. In addition, a temperature sensor and / or a liquid level sensor can be provided in at least one hydrogen tank, and the data of the temperature sensor and / or the liquid level sensor can be detected and further processed by means of the control unit. Based on these data, the first valve can also be controlled or adjusted by means of the control unit.

[0024] Based on the data of a pressure sensor or a temperature sensor or a level sensor, the liquid level or the state of hydrogen in the hydrogen tank of the hydrogen supply system can be monitored. If, for example, it is determined that the liquid level changes faster than the pressure in the hydrogen tank, it can be considered that the control unit quickly switches the first valve to a currentless state in order to open the first valve, and thus, for example, the check valve is closed. As a result, before the control unit opens the first valve again, the required pressure can be established in the at least one hydrogen tank for optimally conveying liquid hydrogen.

[0025] Furthermore, within the scope of the invention it can be provided that at least one heat exchange unit or heat generator is arranged in or on the hydrogen tank.

[0026] Here, the heat transfer unit or heat generator can be arranged in the hydrogen tank or in the intermediate space between the inner tank and the outer tank of the hydrogen tank. The heat transfer unit or heat generator can be used to boil the hydrogen, so that the pressure for delivering liquid hydrogen from at least one hydrogen tank of the hydrogen supply system in an optimized manner can be ensured. The heat transfer unit or heat generator can also be controlled and / or regulated by the control unit.

[0027] A second aspect of the present invention is a method for regulating the pressure in a hydrogen tank of a hydrogen supply system according to the first aspect of the present invention in a certain operating state of a consumer. The method comprises the following steps:

[0028] - determine the operating status of the consumer with the help of the control unit,

[0029] A distinction is made between an operating request, in which the first valve is closed, and a rest operation, in which the first valve is open.

[0030] - if an operating request for the consumer is ascertained when ascertaining the operating state, the control unit closes or keeps closed a first valve in the pressure equalization line of the first line section in order to maintain a pressure difference in the hydrogen supply line, and hydrogen is supplied from at least one hydrogen tank via the hydrogen supply line to an interface via which the hydrogen-operated drive can be attached to the hydrogen supply line,

[0031] If the operating state is determined to be idle operation or a request for idle operation of the consumer is determined, the control unit opens the first valve in the pressure equalization line of the first line section to reduce the pressure difference in the hydrogen supply line and hydrogen flows back from the first line section into the hydrogen tank.

[0032] As mentioned above, two operating states are distinguished. An operating request is a state of a consumer or a hydrogen-operated drive in which hydrogen needs to be supplied to the consumer or hydrogen-operated drive, so that it is necessary to ensure that a constant pressure is always present in the at least one hydrogen tank in order to ensure that hydrogen is constantly supplied to the interface of the hydrogen-operated drive. This is ensured by vaporizing hydrogen in the at least one hydrogen tank by a heat transfer unit or a heat generator. An operating request can be understood to mean, for example, driving operation or operation during a parking phase for operating a standstill heater or for recharging the traction battery.

[0033] In the context of the present invention, it is conceivable that, when a stationary operation of the consumer is ascertained, the control unit switches off the current flow in the first valve for the purpose of opening.

[0034] By switching the first valve to no current, the first valve automatically opens, so that the pressure in the pressure equalization line drops and the pressure difference for squeezing liquid hydrogen out of the hydrogen tank via the first line section and the second line section of the hydrogen supply line to a consumer or an interface is so small that the liquid hydrogen flows back into the hydrogen tank.

[0035] Furthermore, it is conceivable that, when an operating request is received from a consumer, the nonreturn valve is opened or remains open, or the pressure relief valve is closed or remains closed.

[0036] In response, both the non-return valve and the pressure relief valve can react to the open or closed state of the first valve and the pressure difference associated therewith, or can be controlled and / or regulated by means of a control unit. Thus, depending on the operating state, a desired pressure ratio can be set in at least one hydrogen tank via the non-return valve or the pressure relief valve.

[0037] In particular, the combination of the first valve, in particular in the embodiment as a solenoid valve, and a non-return valve is particularly advantageous. Here, the solenoid valve is used to switch on and off the liquid hydrogen supply, while the non-return valve is used to close the system during the idle phase.

[0038] The switching on of the delivery is achieved by closing the solenoid valve. If the pressure in the hydrogen tank is now increased by vaporizing the liquid, a pressure drop is established between the upper end and the lower end of the first line section of the hydrogen supply line. If the pressure difference is large enough, the liquid column pushes open the non-return valve and the liquid can be delivered from the hydrogen tank.

[0039] To interrupt the delivery, the solenoid valve is opened. As a result, the pressure between the upper end and the lower end of the first line section of the hydrogen supply line can be equalized, and the liquid column in the first line section falls back downwards. The nonreturn valve closes immediately.

[0040] In this case, a very low opening pressure can be selected for the design of the nonreturn valve, since the pressure outside the hydrogen tank will automatically continue to build up during longer shutdown phases due to the increase in temperature, so that the nonreturn valve is additionally blocked as a result.

[0041] Within the scope of the invention, it may be advantageous if, when a stationary operation is ascertained, the nonreturn valve is closed or remains closed or the pressure relief valve is opened or remains open.

[0042] In this case, both the nonreturn valve and the pressure relief valve can react to the pressure conditions resulting from the opening of the first valve and thus close or open. Control by means of a control unit is also conceivable.

[0043] The closing of the nonreturn valve or the opening of the pressure relief valve also constitutes a safety aspect, since the hydrogen supply system is thereby closed, so that in stationary operation no hydrogen can escape or excess pressure can escape from the hydrogen supply system.

[0044] Within the scope of the invention it is conceivable that during an operating request by a consumer, the heat transfer unit or the heat generator is regulated and / or controlled by the control unit.

[0045] The control unit can control and / or adjust not only the heat transfer unit or the heat generator, but also the first valve. Via the heat transfer unit or the heat generator, the internal tank pressure in at least one hydrogen tank can be adjusted and set, and the internal tank pressure can therefore be kept constant. Wherein, according to the operation request, the first valve can be opened or closed. If it is necessary to constantly transport hydrogen to the consumer, the heat transfer unit or the heat generator is opened and the first valve is closed.

[0046] A third aspect of the present invention is a hydrogen-operated drive, in particular a fuel cell system having a fuel cell or a fuel cell stack, which has a hydrogen supply system according to the first aspect of the present invention, wherein the method according to the second aspect of the present invention can be performed for pressure regulation in the hydrogen supply system.

[0047] The advantages described in detail for the hydrogen supply system according to the first aspect of the invention also apply to the method for pressure regulation in a hydrogen tank of a hydrogen supply system according to the second aspect of the invention and to the hydrogen-operated drive according to the third aspect of the invention.

[0048] Further advantages, features and details of the invention emerge from the following description, in which several exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the description may be important to the invention individually or in any combination. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The invention is illustrated in the following figures:

[0050] Figure 1 A schematic diagram showing a hydrogen supply system,

[0051] Figure 2 A schematic diagram showing a method for pressure regulation in a hydrogen supply system,

[0052] Figure 3 A schematic diagram of a fuel cell system is shown. DETAILED DESCRIPTION

[0053] exist Figure 11 shows a hydrogen supply system 10 for a hydrogen-operated drive 12 of a consumer 18 . The hydrogen-operated drive 12 can be, for example, a fuel cell system 56 having a fuel cell 14 or a fuel cell stack 16 having a plurality of fuel cells 14 .

[0054] The hydrogen supply system 10 has at least one hydrogen tank 20, which is used for cryogenic storage of hydrogen and for supplying the hydrogen-operated drive 12. Here, the hydrogen tank 20 has an inner tank 44 and an outer tank 46 arranged around the inner tank 44. Deeply refrigerated hydrogen as liquid hydrogen 54 and as gaseous hydrogen 56 is present in the hydrogen tank 20. In addition, the hydrogen supply system 10 has a hydrogen supply line 22 between at least one hydrogen tank 20 and an interface 24 for attaching to the hydrogen-operated drive 12. Here, the hydrogen supply line 22 is divided into a first line section 26 and a second line section 28. The first line section 26 is arranged in at least one hydrogen tank 20 so that the first line section is also in the liquid hydrogen 54 when the liquid level of the liquid hydrogen 54 in the hydrogen tank 20 is low, so that the liquid hydrogen can be transported 150 under the operation request 120. The second line section 28 is arranged outside the at least one hydrogen tank 20.

[0055] In addition, the hydrogen supply system 10 has a first valve 30. The first valve is used to switch on and off the hydrogen supply. The first valve 30 is a valve 30 that is open when there is no current. The first line section 26 has a pressure balance line 32. Here, the first valve 30 of the first line section 26 is arranged in the pressure balance line 32. Only gaseous hydrogen 56 exists in the pressure balance line 32.

[0056] This is particularly advantageous since in this case no liquid hydrogen 54 flows through the first valve 30 , which is designed as a solenoid valve, so that it is not exposed to large temperature fluctuations of the liquid hydrogen 54 between 20 K and 200 K.

[0057] In order to particularly easily convey liquid hydrogen 54 from hydrogen tank 20 via interface 24 to hydrogen-operated drive 12 , at least first line section 26 is designed as a vacuum-tight transfer siphon. Due to the pressure difference between hydrogen tank 20 and consumer 18 , this allows particularly easy conveyance of liquid hydrogen 54 .

[0058] In the present case, a nonreturn valve 34 is firstly provided in the second line section 28 of the hydrogen supply line 22. During the delivery for the operating request 120, a pressure relief valve 36 is provided downstream of the nonreturn valve 34 in the flow direction of the liquid hydrogen 54. This allows a simple closure of the hydrogen tank 20, so that no hydrogen can escape from the hydrogen tank 20 during the shutdown phase or in the stationary operation 130. At the same time, the pressure relief valve 36 ensures increased safety in the event of an overpressure of the entire hydrogen supply system 10.

[0059] In order to adjust and / or control the first valve 30 and to detect other data of the entire hydrogen supply system 10, a control unit 38 is provided. In addition, the control unit can have a comparison unit 52. With the help of the control unit 38, for example, data of a pressure sensor 40 can be detected and determined, which is arranged in at least one hydrogen tank 20. Based on the data, conclusions about the entire hydrogen supply system 10 can be drawn, so that the control unit 38 can control and / or regulate the first valve 30 accordingly. In addition, a temperature sensor 48 and a liquid level sensor 50 can be arranged in the hydrogen tank 20. The data of the temperature sensor 48 and the liquid level sensor 50 can also be detected or determined (110) and further processed by the control unit 38.

[0060] In addition, a heat transfer unit or heat generator 42 is provided in at least one hydrogen tank 20. Advantageously, the heat transfer unit is arranged in the intermediate space between the inner tank 44 and the outer tank 46. The heat transfer unit or heat generator 42 can also be controlled and regulated by means of the control unit 38 in order to increase the temperature of the hydrogen, in particular the liquid hydrogen 56, in such a way that the hydrogen boils into gaseous hydrogen 56, so that the pressure in the hydrogen tank 20 can be kept constant during operation due to the volume increase.

[0061] exist Figure 2 In the figure, the following is shown for the operation of the consumer 18 in a certain operating state according to Figure 1 A method 100 for regulating pressure in a hydrogen tank 20 of a hydrogen supply system 10 is disclosed.

[0062] In this case, firstly the operating state of the consumer 18 is ascertained ( 110 ) using the control unit 38 .

[0063] according to Figure 2, in the first query, an operating request 120 is first determined. In the operating request 120, the first valve 30 is closed. For this purpose, the control unit 38 can close (140) or keep closed (140) the first valve 30 of the pressure equalization line 32 of the first line section 26. By closing (140) or keeping closed (140) the first valve 30 during the operating request 120, the pressure in the pressure equalization line 32 is kept constant, so that the pressure difference between the first line section 26 and the second line section 28, and here primarily the pressure difference between the start of the first line section 26 and the end of the second line section 28, is kept constant in the area of ​​the interface 24, in order to deliver (150) liquid hydrogen 54 from the hydrogen tank 20 to the hydrogen-operated drive 12 of the consumer 18.

[0064] When an operating request 200 of consumer 18 is ascertained 210 , nonreturn valve 34 is opened ( 190 ) or remains open ( 190 ) so that liquid hydrogen 54 is supplied to the consumer. If there is no excess pressure in hydrogen supply system 10 , pressure relief valve 36 is closed.

[0065] If the control unit 38 determines (110) a standstill operation 130 or a request for standstill operation 130, the control unit 38 opens (160) the first valve 30 of the first line section 26 of the pressure equalization line 32 by switching (180) the first valve 30 to a de-energized state. The first valve 30 is thus opened and the pressure difference in the hydrogen supply line 22 can no longer be maintained and is correspondingly reduced. This results in the liquid hydrogen 54 flowing back (170) from the first line section 26 into the hydrogen tank 20.

[0066] If idle mode 130 is determined (110), nonreturn valve 34 is closed (210) or is closed (210) due to the opening of first valve 30. In order to be able to relieve the residual pressure from hydrogen supply system 10 or second line section 28, pressure relief valve 36 is opened (220) in the present case.

[0067] In order to keep the pressure in the hydrogen tank 20 constant during an operating request 120 (in the present case, driving operation), the control unit 38 regulates and / or controls (230) the heat transfer unit or heat generator 42 so that the liquid hydrogen 54 boils into gaseous hydrogen 56 and the pressure in the hydrogen tank 20 increases.

[0068] exist Figure 3 1 shows a hydrogen-operated drive 12 in the form of a fuel cell system 58. The fuel cell system 58 has a fuel cell stack 16, which has a plurality of fuel cells 14. In addition, a Figure 1 Here, in order to adjust the pressure in the hydrogen supply system 10, the following steps can be performed: Figure 2 Method 100.

Claims

1. A hydrogen supply system (10) for a hydrogen-operated drive (12) of a consumer (18), the consumer being in particular a motor vehicle, the hydrogen-operated drive being in particular a fuel cell system (56) having a fuel cell (14) or a fuel cell stack (16), the hydrogen supply system comprising: at least one hydrogen tank (20) for cryogenically storing hydrogen and for supplying the hydrogen-operated drive (12); A hydrogen supply line (22) between the at least one hydrogen tank (20) and an interface (24) for attachment to the hydrogen-operated drive (12), wherein The hydrogen supply line (22) has a first line section (26) and a second line section (28), wherein the first line section (26) is arranged in the at least one hydrogen tank (20) and the second line section (28) is arranged outside the at least one hydrogen tank (20); and a first valve (30), in particular a first valve (30) which is open when no current is supplied and which is used to switch the hydrogen supply on and off, It is characterized in that The first line section (26) has a pressure equalization line (32), wherein a first valve (30) of the first line section (26) is arranged in the pressure equalization line (32).

2. The hydrogen supply system (10) according to claim 1, It is characterized in that The first valve (30) is a solenoid valve.

3. The hydrogen supply system (10) according to claim 1 or 2, It is characterized in that The first line section (26) and / or the second line section (28) and / or the entire hydrogen supply line (22) are designed as a vacuum-insulated transfer siphon.

4. The hydrogen supply system (10) according to any one of the preceding claims, It is characterized in that A check valve (34) is arranged in the second line section (28) of the hydrogen supply line (22).

5. The hydrogen supply system (10) according to any one of the preceding claims, It is characterized in that A pressure relief valve (36) is arranged in the second line section (28) of the hydrogen supply line (22).

6. The hydrogen supply system (10) according to any one of the preceding claims, It is characterized in that A control unit (38) is provided for regulating and / or controlling the hydrogen supply system (10).

7. The hydrogen supply system (10) according to any one of the preceding claims, It is characterized in that At least one pressure sensor (40) is arranged in the at least one hydrogen tank (20), which is used to determine the pressure in the at least one hydrogen tank (20).

8. The hydrogen supply system (10) according to any one of the preceding claims, It is characterized in that At least one heat transfer unit or heat generator (42) is arranged in the at least one hydrogen tank (20).

9. A method (100) for regulating the pressure in a hydrogen tank (20) of a hydrogen supply system (10) according to any one of the preceding claims in a certain operating state of a consumer (18), the method comprising the following steps: determining (110) the operating state of the consumer (18) by means of the control unit (38), in, A distinction is made between a run request (120) and a standstill run (130), i) in the operation request, the first valve (30) is closed, ii) in said stationary operation, said first valve (30) is open, wherein, when an operating request (120) of the consumer (18) is determined (110), a first valve (30) in a pressure equalization line (32) of a first line section (26) is closed (140) or remains closed (140) by a control unit (38) in order to maintain a pressure difference in the hydrogen supply line (22), and hydrogen is delivered (150) from at least one hydrogen tank (20) via the hydrogen supply line (22) to the interface (24), and When the stationary operation (130) of the consumer is determined (110) or when a request for the stationary operation (130) of the consumer (18) is determined, the control unit (38) opens (160) the first valve (30) in the pressure equalization line (32) of the first line section (26) to reduce the pressure difference in the hydrogen supply line (22), and hydrogen flows back (170) from the first line section to the hydrogen tank (20).

10. The method (100) according to claim 9, It is characterized in that When an operating request (120) for the consumer (18) is determined, the nonreturn valve (34) is opened (190) or remains open (190) or the pressure relief valve (36) is closed (200) or remains closed (200).

11. The method (100) according to claims 9 to 10, It is characterized in that When a stationary operation (130) of the consumer (18) is determined, the nonreturn valve (34) is closed (210) or remains closed (210) or the pressure relief valve (36) is opened (220) or remains open (220).

12. The method (100) according to claims 9 to 11, It is characterized in that During an operating request (120) by the consumer (18), the heat transfer unit (42) is regulated and / or controlled (230) by the control unit (38).

13. A hydrogen-operated drive (12), in particular a fuel cell system (58) having a fuel cell (14) or a fuel cell stack (16), the hydrogen-operated drive having a hydrogen supply system (10) according to any one of claims 1 to 8, wherein: The method (100) according to any one of claims 9 to 12 can be carried out for pressure regulation in the hydrogen supply system (10).

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