DE102010061796A1 - Fluid supply device for use in fuel cell system for separate supply of e.g. oxidizer in middle pressure range, has coupling device coupling relaxation device with compression device such that energy is freely released to increase pressure - Google Patents

Abstract

The device (104) has a relaxation device (114) lowering pressure of fluid e.g. natural gas, from a high pressure range to a middle pressure range. A compression device (118) increases pressure of another fluid from a low pressure range to the middle pressure range. A coupling device (124) couples the relaxation device with the compression device such that energy is freely released when lowering the pressure of the former fluid to increase the pressure of the latter fluid. The coupling device comprises a driving apparatus for driving the relaxation device and the compression device. An independent claim is also included for a method for separate supply of two fluids in a middle pressure range.

Description

The present invention relates to a fluid delivery device for separately providing at least two fluids in a medium pressure range.

By means of fluid supply devices, for example, a fuel cell system, two fluids, namely an oxidizer and a fuel, are supplied. In particular, if the fuel cell system is to be operated at elevated pressure relative to the atmospheric conditions, it must be ensured by means of the fluid supply device that the two fluids have the pressure prescribed for the fuel cell system. This can be realized by compressing the oxidizer, namely air, by means of a compressor and thus bringing it to a higher pressure level. Further, the fuel which, particularly when using natural gas, can be supplied to the fluid delivery device under a very high fluid pressure, can be expanded to obtain the desired fluid pressure for the fuel. The fluid pressure of the oxidizer is thus brought from a low pressure range (atmospheric pressure) to a middle pressure range (operating pressure of the fuel cell system). Further, the fluid pressure of the fuel is brought from a high pressure range (fluid pressure in a supply line) to the middle pressure range (operating pressure of the fuel cell system). The pressures of the two fluids can be adjusted independently of each other to the desired pressure for the fuel cell system.

The object of the present invention is to provide a fluid supply device for the separate provision of at least two fluids in a medium pressure range, which enables a particularly energy-efficient provision of the at least two fluids in the middle pressure range.

This object is achieved in a fluid delivery device of the type mentioned above in that the fluid delivery device comprises a relaxation device for lowering the fluid pressure of a first fluid from a high pressure range to the middle pressure range and a compression device for increasing the fluid pressure of a second fluid from a low pressure range to the middle Pressure range comprises, wherein the fluid supply device comprises a coupling device for coupling the expansion device with the compression device, so that the energy released when lowering the fluid pressure of the first fluid is at least partially usable for increasing the fluid pressure of the second fluid.

By fluid is meant in this specification and the appended claims a flowable medium, for example a liquid or a gas.

An expansion device in this specification and the appended claims means any type of device by means of which a fluid pressure of a fluid, preferably controlled, can be lowered.

A compression device in this description and the appended claims means any type of device by means of which a fluid pressure of a fluid, preferably controlled, can be increased.

Because the expansion device of the fluid delivery device is coupled to the compression device of the fluid delivery device by means of a coupling device, the energy released when the fluid pressure of the first fluid is lowered is not lost, but can be used to increase the fluid pressure of the second fluid. In this way, a particularly energy-efficient operation of the fluid supply device is possible, so that the at least two fluids to be provided can be provided with a particularly low external energy expenditure, in particular without external energy supply.

In one embodiment of the invention it is provided that the expansion device is mechanically coupled to the compression device. In this way, a particularly simple transfer of the mechanical energy obtained by the expansion device when lowering the fluid pressure of the first fluid from the high pressure range to the middle pressure range to the compression device is possible.

In particular, it can be provided here that the expansion device and the compression device have a common shaft, on which, for example, a turbine of the expansion device and / or a compressor of the compression device are arranged. As a result, by way of example, a rotational movement generated by the turbine can be transmitted particularly easily to the compressor.

Alternatively or additionally, it can be provided that the expansion device is electrically coupled to the compression device.

In one embodiment of the invention can be provided that the low pressure range includes the atmospheric pressure. In particular, it may be provided that the low pressure range is, for example, between about 0.5 bar and about 1.5 bar, in particular in the vicinity of about 1 bar.

It is favorable if the mean pressure range is between approximately 2 bar and approximately 20 bar, preferably between approximately 3 bar and approximately 7 bar, in particular in the vicinity of approximately 5 bar. Thereby, by means of the fluid supply device, two fluids, in particular an oxidizer and a fuel, can be provided in a pressure range which is preferred for the operation of a high-temperature fuel cell (SOFC).

The high pressure range is for example between about 20 bar to about 100 bar, preferably between about 40 bar and about 80 bar, in particular in the environment of about 60 bar. In particular, when the first fluid is to be expanded from such a high pressure range to the middle pressure range, the relaxation can be realized directly by means of the fluid supply device and thus without additional expansion devices. For example, it can be provided here that fuel, in particular natural gas, can be supplied directly from a high-pressure line, for example a pipeline, in particular a transmission line (transcontinental line), to the fluid supply device.

In principle, it is advantageous if the energy released when lowering the fluid pressure of the first fluid is sufficient to compress the desired amount of the second fluid such that the fluid pressure of the second fluid increases from the low pressure range to the middle pressure range. For this purpose, it can be provided, for example, that a larger amount of the first fluid is expanded than is actually required for the fluid supply device. It can thereby be ensured that the energy transferred from the expansion device to the compression device by means of the coupling device is sufficient to provide the desired quantity of the second fluid with a fluid pressure in the middle pressure range. The excess amount of the relaxed first fluid is then available, for example, for other consumers.

Alternatively, it can be provided that the coupling device comprises a drive device for driving the expansion device and / or the compression device. In this way, in particular, additional energy can be supplied to the compression device in order to be able to provide the desired amount of the second fluid with a fluid pressure in the middle pressure range. This is particularly advantageous if the energy released by the lowering of the fluid pressure of the first fluid should not be sufficient to compress the desired amount of the second fluid and an additional expansion of the first fluid not required for the fluid delivery device is not desired for lack of further consumers.

It may be favorable if the fluid supply device comprises a first fluid supply for supplying the first fluid from a first fluid supply, by means of which the relaxation device, the first fluid with a fluid pressure in the high pressure range can be fed. In this way, a direct coupling of the fluid supply device to the first fluid supply is possible.

In particular, it can be provided that the first fluid supply is a gas pipeline, in particular a natural gas pipeline, in which gas, in particular natural gas, is conducted at, for example, approximately 60 bar.

It is also advantageous if the fluid supply device comprises a second fluid supply for supplying the second fluid from a second fluid supply, by means of which the compression device, the second fluid with a fluid pressure in the low pressure range can be fed. In this way, a direct coupling of the fluid supply device with the second fluid supply can take place.

In particular, when the second fluid is air and is thus present in the environment of the fluid supply device in sufficient quantity, it can be provided that the fluid supply device has an opening, by means of which the compression device, the second fluid (air) from the second fluid supply (environment of Fluid supply device) in the low pressure range, namely at atmospheric pressure, can be fed.

It may be advantageous if the fluid supply device comprises separate fluid lines for the fluids to be provided. In this way, a secure separation of the separately provided at least two fluids is guaranteed. In particular, this can effectively prevent a direct fluid connection and / or a direct pressure equalization between the at least two fluids to be provided.

The fluid delivery device according to the invention is particularly suitable for Use in a fuel cell system comprising at least one fuel cell device and at least one fluid supply device for providing fuel and oxidizer to the fuel cell device.

Because the fuel cell system according to the invention comprises a fluid supply device according to the invention, a particularly energy-efficient and thus cost-effective provision of the fluids necessary for the operation of the fuel cell device, namely fuel and oxidizer, can take place.

The fuel cell system according to the invention preferably has the features and / or advantages already described above in connection with the fluid delivery device according to the invention.

In a refinement of the fuel cell system, it is provided that the fuel cell system comprises at least one heat exchanger, by means of which heat can be transferred from an exhaust gas of the fuel cell device to a fuel supply line and / or an oxidizer supply line of the fuel cell device. In this way, a preconditioning of the fluids to be supplied to the fuel cell device can be realized while reducing the external energy required for this purpose. In particular, by using a heat exchanger, the first fluid, which is usually very strongly cooled by the lowering of the fluid pressure, can be heated at least approximately to a favorable inlet temperature for the fuel cell device.

It is another object of the present invention to provide a method for providing at least two fluids separately in a medium pressure range, which is particularly energy efficient and requires no or only a small supply of external energy.

This object is achieved in a method of the aforementioned type in that the fluid pressure of a first fluid is lowered by means of a relaxation device from a high pressure range to the average pressure range and that the fluid pressure of a second fluid by means of a compression device from a low pressure range to the average pressure range is increased, wherein the released during lowering of the fluid pressure of the first fluid energy is used to increase the fluid pressure of the second fluid.

Characterized in that the energy released when lowering the fluid pressure of the first fluid is used for increasing the fluid pressure of the second fluid, no or at least only a small power supply from an external power source is necessary, so that the method is particularly energy efficient.

The method according to the invention preferably has the features and / or advantages described above in connection with the fluid supply device according to the invention and / or the fuel cell system according to the invention.

In a development of the invention, it is provided that the energy released when the fluid pressure of the first fluid has been reduced is converted into mechanical energy by means of the expansion device and transferred from the expansion device to the compression device by means of a coupling device. In this way, efficient transmission of the energy released in the expansion device is possible. In particular, no conversion of the energy released in the expansion device into electrical energy has to take place.

The mechanical energy into which the energy released when lowering the fluid pressure of the first fluid is converted by means of the expansion device is in particular kinetic energy, in particular a rotational energy of a turbine of the expansion device, a compressor of the compression device and / or a common shaft for the turbine of the expansion device and the compressor of the compression device.

It can be advantageous if the first fluid is a fuel and the second fluid is an oxidizer, wherein the fuel and the oxidizer are fed to a fuel cell device.

In particular, when the fuel and / or the oxidizer are heated before being supplied to the fuel cell device by means of at least one heat exchanger, wherein the at least one heat exchanger is coupled to an exhaust pipe of the fuel cell device, is a particularly energy-efficient operation of the fuel cell device, that is, an operation of Fuel cell device with a high efficiency, possible.

The fluid supply device according to the invention and the fuel cell system according to the invention are particularly suitable for carrying out the method according to the invention.

The present invention further relates to the use of a fluid delivery device according to the invention and / or a Fuel cell system according to the invention for carrying out the method according to the invention.

It may be favorable if a fluid supply device is coupled to a high-temperature fuel cell (SOFC). In particular, this allows a pressure-charged operation of the high-temperature fuel cell (SOFC).

Further features and advantages of the invention are the subject of the following description and the drawings of exemplary embodiments.

In the figures show:

1 a schematic representation of a first embodiment of a fuel cell system, in which from a fuel cell device of the fuel cell system escaping exhaust gas remains unused;

2 one of the 1 corresponding schematic representation of a second embodiment of a fuel cell system in which a heat exchanger for transferring heat from an exhaust pipe of a fuel cell device of the fuel cell system is provided on a fuel supply line of the fuel cell system;

3 one of the 1 corresponding schematic representation of a third embodiment of a fuel cell system in which two parallel heat exchangers are provided to heat both a fuel supply line and an oxidant supply line of the fuel cell system by means of existing in an exhaust gas heat; and

4 one of the 1 corresponding schematic representation of a fourth embodiment of a fuel cell system in which two serially connected heat exchanger are provided to heat both a fuel supply line and an oxidant supply line of the fuel cell system by means of existing in an exhaust gas heat.

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

An in 1 shown schematically, as a whole with 100 designated first embodiment of a fuel cell system comprises a fuel cell device 102 For example, a high-temperature fuel cell (SOFC), which by means of a fluid supply device 104 two fluids, namely a first and a second fluid, can be fed.

The first fluid is, for example, fuel, which is the fluid delivery device 104 by means of a first fluid supply 106 from a first fluid supply 108 can be fed. The first fluid supply 108 is for example a gas pipeline, in particular a natural gas pipeline, in which the first fluid, namely natural gas, at a fluid pressure of, for example, about 60 bar is performed.

Further, the fluid delivery device is 104 by means of a second fluid supply 110 a second fluid, for example an oxidizer, in particular air, from a second fluid supply 112 fed. In particular, when the second fluid is air, the second fluid supply is 112 the environment of the fuel cell system 100 , The fluid delivery device 104 then only includes an opening through which ambient air from the environment of the fuel cell system 100 can be sucked.

The first fluid and the second fluid are thus in the original delivery state with fluid pressures in very different pressure ranges.

Thus, the fluid pressure of the first fluid is located at about 60 bar in a high pressure range. The fluid pressure of the second fluid, however, is the atmospheric pressure, which is located in a low pressure range.

For the operation of the fuel cell device 102 The two fluids must be brought at least approximately to the same fluid pressure. The fluid pressure of the first fluid is lowered for this purpose. Furthermore, the fluid pressure of the second fluid is increased for this purpose. There is no complete relaxation of the first fluid such that the fluid pressure of the first fluid decreases from the high pressure range at, for example, about 60 bar to the low pressure range at atmospheric pressure. Rather, the fluid pressure of the first fluid is preferably lowered to a mean pressure range, for example to about 5 bar.

To this end, includes the Fluldbereitstellungsvorrichtung 104 a relaxation device 114 , which by means of the first fluid supply 106 the first fluid from the first fluid supply 108 can be supplied and by means of which the fluid pressure of the first fluid can be lowered from the high pressure range to the average pressure range.

The relaxation device 114 is by means of a fuel supply line 116 with the fuel cell device 102 connected, so the first one Fluid after lowering the fluid pressure from the high pressure range to the average pressure range of the fuel cell device 102 can be fed.

The for the operation of the fuel cell device 102 required air, that is, the second fluid from the second fluid supply 112 , is via the second fluid supply 110 a compression device 118 the fluid delivery device 104 supplied and by means of the compression device 118 compressed. As a result, the fluid pressure of the second fluid increases from the low pressure range to the middle pressure range, in particular from approximately atmospheric pressure to approximately 5 bar.

By means of an oxidizer supply line 120 , which provides fluid communication between the compression device 118 and the fuel cell device 102 is the compressed second fluid of the fuel cell device 102 fed.

In this first embodiment of the fuel cell system 100 For example, the two fluids will be at the same fluid pressure of, for example, about 5 bar of the fuel cell device 102 supplied and can in the fuel cell device 102 react to generate electricity.

The exhaust gas produced by the reaction of the two fluids is separated by means of an exhaust pipe 122 from the fuel cell device 102 dissipated.

Basically, the operation requires the expansion device 114 no energy input. Rather, during the expansion of the first fluid by means of the expansion device 114 Energy free.

The compression device 118 However, for their operation, that is, for compressing the second fluid, requires energy to be supplied.

At the in 1 illustrated fuel cell system 100 is for energy efficient operation of the fluid delivery device 104 provided that the fluid delivery device 104 a coupling device 124 comprises, by means of which the expansion device 114 and the compression device 118 are coupled, so that in the expansion device 114 When lowering the fluid pressure of the first fluid released energy at least partially for increasing the fluid pressure of the second fluid by means of the compression device 118 can be used.

The relaxation device 114 includes a turbine for this purpose 126 on a wave 128 is arranged and which by the relaxation of the first fluid together with the shaft 128 is set in rotation.

The compression device 118 further includes a compressor 130 which is also on the shaft 128 is arranged so that a rotation of the turbine 126 a rotation of the compressor 130 causes.

As a result, a particularly simple transmission, namely a mechanical transmission, of the energy released upon lowering the fluid pressure of the first fluid to the compression device 118 possible, so that no or at least only little external energy must be expended to the second fluid by means of the compression device 118 to compress to the desired fluid pressure.

It is conceivable that a particularly large amount of the second fluid for the operation of the fuel cell device 102 is necessary and necessary for the compression of this amount of energy can not be covered by the released when lowering the fluid pressure of the first fluid energy. This is the case, for example, when only a small amount of the first fluid for operating the fuel cell device 102 necessary is.

In such a constellation can be provided that a larger amount of the first fluid by means of the expansion device 114 is relaxed than for the operation of the fuel cell device 102 would be necessary. This for the operation of the fuel cell device 102 Unnecessary amount of the first fluid is then supplied to other consumers, for example. In the fuel cell supply line 116 this is a turnoff 132 provided by means of which for the operation of the fuel cell device 102 unneeded first fluid in a consumer line 134 can be diverted.

The fuel cell system described above 100 works as follows:
By means of the relaxation device 114 this will be from the first fluid supply 108 (Natural gas pipeline), so that a fluid pressure of the first fluid decreases from a high pressure range (about 60 bar) to a medium pressure range (about 5 bar).

At the same time by means of the compression device 118 a second fluid (ambient air) from the second fluid supply 112 (Environment of the fuel cell system 100 ) so that the fluid pressure of the second fluid is increased from the low pressure range (about 1 bar) to the middle pressure range (about 5 bar).

The fluids now both at a fluid pressure in the middle pressure range (approximately 5 bar) then become the fuel cell device 102 fed and can react with each other there to generate electricity.

This in 1 illustrated fuel cell system 100 is particularly energy efficient, because a coupling device 124 is provided, by means of which the energy released during the lowering of the fluid pressure of the first fluid to the compression device 118 can be transmitted, so that no or only little energy from an external power source must be used to compress the second fluid.

An in 2 illustrated second embodiment of the fuel cell system 100 is different from the one in 1 illustrated first embodiment in that the fuel cell system 100 according to the second embodiment, a heat exchanger 136 comprising, by means of which use of the heat of the exhaust pipe 122 discharged exhaust gas is possible.

The heat exchanger 136 is this way on the exhaust pipe 122 and at the fuel supply line 116 arranged that a heat transfer from the exhaust pipe 122 on the fuel supply line 116 is possible.

Thus, by means of the heat exchanger 136 the heat of the exhaust gas of the fuel cell device 102 for heating the first fluid, namely the fuel usable. In this way, the temperature of the first fluid, which usually by the relaxation of the first fluid by means of the expansion device 114 is very low, can be increased significantly. This serves to additionally increase the efficiency of the fuel cell device 102 ,

Incidentally, the in 2 illustrated second embodiment of the fuel cell system 100 in terms of structure and function with the in 1 illustrated first embodiment, so that reference is made in this regard to the foregoing description.

An in 3 illustrated third embodiment of the fuel cell system 100 is different from the one in 2 illustrated second embodiment in that two heat exchangers 136 are provided, so that the heat of the exhaust gas in the exhaust pipe 122 the fuel cell device 102 both for heating the fuel in the fuel supply line 116 as well as for heating the oxidizer in the Oxidatorzufuhrleitung 120 can be used.

The first heat exchanger 136 is at the exhaust pipe 122 and at the fuel supply line 116 arranged.

The second heat exchanger 136 is on the exhaust pipe 122 and at the oxidizer supply line 120 arranged.

In the third embodiment of the fuel cell system 100 according to 3 is provided that the two heat exchangers 136 operated in parallel. The exhaust pipe 122 is thus divided before a flow through the two heat exchangers 136 on.

Incidentally, the in 3 illustrated third embodiment of the fuel cell system 100 in terms of structure and function with the in 2 illustrated second embodiment, so that in this regard reference is made to the above description.

An in 4 illustrated fourth embodiment of the fuel cell system 100 is different from the one in 3 illustrated third embodiment in that the two heat exchangers 136 not parallel but serially arranged.

The exhaust pipe 122 is arranged so that they first a heat exchanger 136 at the Oxidatorzufuhrleitung 120 and then another heat exchanger 136 at the fuel supply line 116 flows through.

Assuming that the temperature of the first fluid after leaving the expansion device 114 in the fuel supply line 116 about -50 ° C is that the temperature of the second fluid after leaving the compression device 118 in the oxidizer feed line 120 is about 300 ° C and that the temperature of the exhaust gas in the exhaust pipe 122 after leaving the fuel cell device 102 is about 800 ° C to about 1000 ° C, can by means of the heat exchanger 136 according to the fourth embodiment of the fuel cell system 100 an increase in the temperature of the second fluid in the oxidant supply line 120 to about 600 ° C, for example. The temperature of the exhaust gas in the exhaust pipe 122 decreases thereby, so that the temperature of the exhaust gas in the section between the first heat exchanger 136 and the second heat exchanger 136 is about 650 ° C to about 700 ° C.

However, this temperature is still sufficient to the temperature of the first fluid in the fuel supply line 116 from about -50 ° C to about 350 ° C to about 400 ° C.

The temperatures of the first fluid and the second fluid entering the fuel cell device 102 are through the use of heat exchangers 136 thus significantly increased. This increases the efficiency of the fuel cell device 102 ,

Incidentally, the in 4 illustrated fourth embodiment of the fuel cell system 100 in terms of structure and function with the in 3 illustrated third embodiment, so that reference is made in this regard to the foregoing description.

Due to the fact that the fluid supply device 104 for providing the two fluids in the middle pressure range, a coupling device 124 for coupling the relaxation device 114 with the compression device 118 includes, the energy released when lowering the fluid pressure of the first fluid is at least partially usable for increasing the fluid pressure of the second fluid, so that an energy-efficient operation of the fluid supply device 104 and thus a high efficiency of the fuel cell device 102 is guaranteed.

LIST OF REFERENCE NUMBERS

100

The fuel cell system

102

fuel cell device

104

Fluid delivery apparatus

106

first fluid supply

108

first fluid supply

110

second fluid supply

112

second fluid supply

114

relief device

116

Fuel supply line

118

compression device

120

Oxidatorzufuhrleitung

122

exhaust pipe

124

coupling device

126

turbine

128

wave

130

compressor

132

diversion

134

consumer line

136

Heat exchanger

Claims (15)

Fluid supply device for separately providing at least two fluids in a medium pressure range, comprising a relaxation device ( 114 ) for lowering the fluid pressure of a first fluid from a high pressure range to the middle pressure range and a compression device ( 118 ) for increasing the fluid pressure of a second fluid from a low pressure range to the middle pressure range, wherein the fluid delivery device ( 104 ) a coupling device ( 124 ) for coupling the relaxation device ( 114 ) with the compression device ( 118 ), so that the energy released when lowering the fluid pressure of the first fluid is at least partially usable for increasing the fluid pressure of the second fluid. Fluid supply device according to claim 1, characterized in that the expansion device ( 114 ) mechanically with the compression device ( 118 ) is coupled. Fluid supply device according to one of claims 1 or 2, characterized in that the low pressure range comprises the atmospheric pressure. Fluid supply device according to one of claims 1 to 3, characterized in that the coupling device ( 124 ) a drive device for driving the expansion device ( 114 ) and / or the compression device ( 118 ). Fluid supply device according to one of claims 1 to 4, characterized in that the fluid supply device ( 104 ) a first fluid supply ( 106 ) for supplying the first fluid from a first fluid supply ( 108 ) by means of which the expansion device ( 114 ) the first fluid can be supplied with a fluid pressure in the high pressure range. Fluid supply device according to one of claims 1 to 5, characterized in that the fluid supply device ( 104 ) a second fluid supply ( 110 ) for supplying the second fluid from a second fluid supply ( 112 ) by means of which of the compression device ( 118 ) the second fluid can be supplied with a fluid pressure in the low pressure range. Fluid supply device according to one of claims 1 to 6, characterized in that the fluid supply device ( 104 ) separate fluid lines ( 116 . 120 ) for the fluids to be provided. A fuel cell system comprising at least one fuel cell device ( 102 ) and at least one fluid delivery device ( 104 ) according to one of claims 1 to 7 for providing fuel and oxidizer to the fuel cell device ( 102 ). Fuel cell system according to claim 8, characterized in that the Fuel cell system ( 100 ) at least one heat exchanger ( 136 ) by means of which heat from an exhaust gas of the fuel cell device ( 102 ) to a fuel supply line ( 116 ) and / or an oxidizer feed line ( 120 ) of the fuel cell device ( 102 ) is transferable. Method for the separate provision of at least two fluids in a medium pressure range, comprising: lowering the fluid pressure of a first fluid by means of an expansion device ( 114 ) from a high pressure range to the middle pressure range; and - increasing the fluid pressure of a second fluid by means of a compression device ( 118 ) from a low pressure range to the middle pressure range using the energy released when lowering the fluid pressure of the first fluid. A method according to claim 10, characterized in that the energy released during the lowering of the fluid pressure of the first fluid by means of the expansion device ( 114 ) converted into mechanical energy and by means of a coupling device ( 124 ) of the expansion device ( 114 ) on the compression device ( 118 ) is transmitted. Method according to one of claims 10 or 11, characterized in that the first fluid is a fuel and that the second fluid is an oxidizer, wherein the fuel and the oxidizer of a fuel cell device ( 102 ). A method according to claim 12, characterized in that the fuel and / or the oxidizer before being supplied to the fuel cell device ( 102 ) by means of at least one heat exchanger ( 136 ), wherein the at least one heat exchanger ( 136 ) to an exhaust pipe ( 122 ) of the fuel cell device ( 102 ) is coupled. Use of a fluid delivery device ( 104 ) according to one of claims 1 to 7 for carrying out a method according to one of claims 10 to 13. Use of a fuel cell system ( 100 ) according to one of claims 8 or 9 for carrying out a method according to one of claims 10 to 13.

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