WO2018033458A1

WO2018033458A1 - Gas processor unit, and fuel cell device having such a gas processor unit

Info

Publication number: WO2018033458A1
Application number: PCT/EP2017/070274
Authority: WO
Inventors: Norbert Domaschke; Maxime Carre
Original assignee: Robert Bosch Gmbh
Priority date: 2016-08-18
Filing date: 2017-08-10
Publication date: 2018-02-22
Also published as: DE102016215453A1; EP3501052A1

Abstract

The invention relates to a gas processor unit (26, 28), in particular a cathode gas processor (26), for a fuel cell device (10), which has at least one first functional unit (34). The invention is characterized in that at least one first connection box (70) and at least one second connection box (72) are arranged, which are designed to feed at least one exhaust gas. The invention further relates to a fuel cell device (10) having such a gas processor unit (26).

Description

Description title

Gas processor unit, and fuel cell device with such a gas processing unit

The present invention relates to a gas processor unit, in particular cathode gas processor, for a fuel cell device, which has at least a first functional unit. The present invention also relates to a fuel cell device having a gas processing unit according to the invention.

State of the art

DE 10 2014 226 082 A1 discloses a gas processor unit which has a plurality of functional units.

Disclosure of the invention

In contrast, the present invention has the advantage that at least one first connection box (70) and at least one second connection box (72) are arranged, which are set up to supply at least one exhaust gas, thereby enabling a more efficient operation of the gas processing unit.

In this context, a "fuel cell device" is to be understood as meaning, in particular, a device which in particular has a preferably functional component, in particular a design element. and / or functional component, a fuel cell system or the entire fuel cell system is formed.

In this context, a "fuel cell unit" is to be understood as meaning in particular a unit having at least one fuel cell which is provided with at least one chemical energy of at least one, in particular continuously supplied, fuel gas, in particular hydrogen and / or carbon monoxide, and at least one oxidant , in particular oxygen, in particular into electrical energy. The at least one fuel cell can be used, in particular, as a solid oxide fuel cell.

Solid Oxide Fuel Cell, abbreviated to SOFC). Preferably, the at least one fuel cell unit comprises a plurality of fuel cells, which are arranged in particular in a fuel cell stack. In this context, a "gas processor unit" should be understood as meaning, in particular, a unit which is provided with a particularly gaseous fluid in front of a supply line to an anode and / or to a cathode of a fuel cell unit for use within a reaction taking place in the fuel cell unit. In particular, at least part of a gas processor unit or the gas processor as a unit is a cathode gas processor and / or an anode gas processor

Partial unit of the gas processor unit are understood, which is in particular intended to make at least a contribution to a preparation and / or preparation of the particular gaseous fluid and / or the at least one exhaust gas. The gas processor unit comprises in particular a plurality, in particular at least two, in particular different from each other and / or identical to each other trained, functional units. In particular, the functional units of the gas processor unit are integrated in a common housing of the gas processor unit. In particular, a part of the functional units is designed as a cathode gas processor and / or as an anode gas processor. A "cathode gas processor" is to be understood as meaning, in particular, a unit which is intended in particular to heat an ambient air to a reaction temperature before being supplied to a cathode of a fuel cell unit and / or to postpone an anode exhaust gas of the fuel cell unit, alternatively or additionally, the cathode gas processor may be provided be to heat at least a portion of a natural gas and / or a fuel gas and / or a fuel gas-containing gas mixture to a reaction temperature.

An "anode gas processor" is to be understood in particular as meaning a unit which is intended in particular to heat a natural gas and / or a fuel gas and / or a gas mixture containing gas to a reaction temperature and / or the natural gas into a fuel gas and / or a fuel gas mixture Alternatively or additionally, the anode gas processor may be provided to heat at least a portion of ambient air to a reaction temperature prior to delivery to a cathode of a fuel cell unit.

In this context, a "natural gas" is to be understood as meaning, in particular, a gas and / or a gas mixture, in particular a natural gas mixture, which comprises at least one alkane, in particular methane, ethane, propane and / or butane , in particular carbon dioxide and / or nitrogen and / or oxygen and / or sulfur compounds.

In this context, a "connection box" is to be understood as meaning a space, in particular an antechamber and / or plenum, which is adapted to a fluid, in particular an exhaust gas, such as, for example, cathode exhaust gas or anode exhaust gas, or natural gas, and / or ambient air A junction box itself may have additional process connections, which are intended to allow a supply and / or discharge of fluids to a gas processor unit. The features listed in the dependent claims advantageous developments of the invention are possible. Thus, it is advantageous if the at least one first connection box for supplying cathode exhaust gas is set up and the at least one second connection box is arranged for supplying anode exhaust gas, thereby enabling effective operation of the gas processor unit, in particular of the cathode gas processor.

Preferably, at least part of a junction box and / or part of a plurality of junction boxes is part of a functional unit. Preferably, a terminal box, which is provided for feeding cathode exhaust gas, and / or a connection box, which is provided for feeding anode exhaust gas, at least one component of a functional unit, such as a Nachbrenneinheit, or more functional units. Alternatively, however, a terminal box may not be part of a functional unit. For example, a terminal box or a plurality of terminal boxes may be formed as a module, in particular as a module for expanding a gas processor unit. However, a connection box is preferably at least one component of a gas processor unit.

By "set up" or "provided" is meant in particular specially programmed, designed and / or equipped understood. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

It is also advantageous if the at least one first functional unit is designed as a post-combustion unit and / or the gas processor unit has at least one second functional unit, which is preferably designed as a heat exchanger, whereby a compact design with minimized heat losses is made possible.

In this context, a "afterburner unit" is to be understood as meaning in particular a unit which is intended to at least substantially after-burn at least one combustible component of an exhaust gas. at least largely oxidize. In particular, the afterburner unit may comprise a catalytic afterburner and / or a diffusion burner and / or a recuperative burner and / or a partially and / or fully premixing burner and / or a pore burner.

In this context, a "heat exchanger" is to be understood as meaning, in particular, a unit which is intended to transfer heat in the direction of a temperature gradient between at least two, in particular, fluid streams, in particular in a crossflow mode and / or in a DC principle and / or preferably in one Functional units embodied as heat exchangers are provided, in particular, for transferring heat from at least one fluid stream, in particular an exhaust gas and / or an exhaust gas mixture of the fuel cell unit, to an ambient air, which is supplied to the fuel cell unit in at least one operating state the units configured as heat exchangers are in each case designed as coaxial heat exchangers and / or helical tube heat exchangers Alternatively, a functional unit designed as a heat exchanger could be provided for, W RME, to be transmitted from at least one fluid stream, in particular an exhaust gas, preferably an anode exhaust gas from a fuel cell unit, in particular a natural gas and / or a fuel gas and / or a combustion gas containing gaseous mixture, which is supplied in at least one operating state of an anode of the fuel cell unit.

In this context, a "reformer unit" is to be understood as meaning in particular a chemical-technical unit for at least one, in particular partial or complete, treatment of the natural gas, in particular by steam reforming and / or by partial oxidation and / or by an autothermal reforming , In particular for the production of at least one fuel gas and / or a gas-containing gas mixture understood.

In an advantageous embodiment, at least one third connection box, which is set up to supply cathode exhaust gas or anode exhaust gas, is arranged, as a result of which, in particular, the fed cathode exhaust gas and / or anode exhaust gas can be spatially distributed in a targeted manner. It is advantageous if the at least one first functional unit has at least one wall, in particular a perforated plate, with a multiplicity of openings, wherein in particular the connection boxes are formed adjacent to the at least one wall. As a result, a particularly effective supply of the at least one functional unit, preferably the afterburning unit, in particular with cathode exhaust gas and anode exhaust gas, is made possible.

It is particularly advantageous if in each case at least part of the multiplicity of openings is assigned in terms of flow in each case to at least one of the terminal boxes, whereby in particular an effective mixing of fed cathode exhaust gas and anode exhaust gas can take place.

It is advantageous if the terminal boxes are rotationally symmetrical or circularly symmetrical, whereby a cost-effective production and a reduction of possibly occurring thermo-mechanical stresses is made possible.

It is particularly advantageous if the connection boxes are arranged ordered along at least one direction according to their respective size, whereby in particular the accessibility to the process connections of the junction boxes is improved.

In this context, the terminal boxes are arranged "arranged along at least one direction according to their respective size." It should be understood in this context that, in particular starting from a junction box with a greatest spatial extent or with a smallest spatial extent along one direction, the further one Junction boxes are arranged with decreasing spatial extent or increasing spatial extent.

In a particularly advantageous embodiment, the terminal boxes are arranged concentrically, in particular in the radial direction, side by side, whereby in particular a supply of cathode exhaust gas and anode exhaust gas to afterburning unit over a large area of the wall, in particular the perforated plate is distributed. In a further particularly advantageous embodiment, at least two of the junction boxes are arranged inside each other, in particular the at least one second junction box within the at least one first junction box, thereby allowing a much more compact design of the gas processor unit.

In a further particularly advantageous embodiment, the at least one second functional unit is at least partially designed as a helical tube heat exchanger, whereby a more effective heat transfer is achieved.

It is advantageous if the at least second functional unit, in particular the helical tube heat exchanger, is integrated in the at least one first functional unit, preferably in a combustion chamber of the afterburner unit, whereby a more compact design is achieved.

It is particularly advantageous if a pitot tube is arranged for stowage of hot exhaust gas of the afterburner unit, whereby in particular the flow path of the exhaust gas can be specifically influenced.

In a further particularly advantageous embodiment, at least one additional Abgasleitmittel, in particular helical Abgasleitmittel arranged, which is particularly intended to hot exhaust gas of the afterburner unit, preferably along a course of helical Rohrwärmeübertragers to lead, whereby the heat transfer can also be further improved.

In a further particularly advantageous embodiment, the at least one first functional unit has at least one access, preferably closable access, in particular a service opening, whereby a maintenance of the gas processor unit is made possible.

In particular, the at least one access in the at least one wall of the at least one first functional unit and / or at least partially formed by at least one of the terminal boxes, whereby the access is realized in a technically elegant manner. In a further particularly advantageous embodiment, the at least second functional unit is at least partially designed as a helical double tube heat exchanger, in particular with at least one pipe transposition, whereby the heat transfer is additionally increased.

drawings

In the drawings, embodiments of the invention are provided schematically and explained in more detail in the following description. Show it

Fig. 1 is a schematic representation of an embodiment of a fuel cell device;

Fig. 2 is a schematic external view of an embodiment of a gas processor unit;

Fig. 3 is a schematic cross-sectional view of an embodiment of a gas processor unit;

Fig. 4 is a schematic cross-sectional view of a lower portion of the embodiment of the gas processing unit of Fig. 3;

Fig. 5 is a schematic cross-sectional view of another embodiment of a gas processor unit;

Fig. 6 is a schematic cross-sectional view of another embodiment of a gas processor unit;

Fig. 7 is a schematic cross-sectional view of another embodiment of a gas processor unit;

Fig. 8 is a schematic cross-sectional view of a lower portion of the embodiment of the gas processing unit of Fig. 7; 9 is a schematic cross-sectional view of another embodiment of a gas processor unit;

The person skilled in the art will expediently also consider the features disclosed in the description and the drawings individually and combine these into meaningful further combinations.

description

FIG. 1 shows a schematic representation of an exemplary embodiment of a fuel cell device 10. The fuel cell device 10 comprises a fuel cell unit 12. The fuel cell unit 12 is shown here in simplified form as a fuel cell 14 for generating electrical and thermal energy. The electrical energy can be tapped via two DC lines 16, 18. Alternatively, however, a design of a fuel cell unit as a fuel cell stack with a plurality of fuel cells is conceivable.

The fuel cell 14 is preferably designed as a solid oxide fuel cell. The fuel cell unit 12, or the fuel cell 14, comprises an anode 20, a cathode 22 and an electrolyte 24 arranged between the anode 20 and the cathode 22.

Furthermore, the fuel cell device 10 has two gas processor units 26, 28. The gas processor unit 26 is a cathode gas processor 30. The gas processor unit 28 is an anode gas processor 32. Alternatively, however, it is also conceivable for the two gas processor units 26, 28 to be housed in a gas processor unit, in particular as a unit. are formed.

The cathode gas processor 26 has a first functional unit 34 and a second functional unit 36. The first functional unit 34 is designed as a post-combustion unit 38, while the second functional unit 36 is designed as a heat exchanger 40. The anode gas processor 32 has a third functional unit 42, a fourth functional unit 44 and a fifth functional unit 46. The third functional unit 42 and the fifth functional unit 46 are each designed as heat exchangers 48, 52, while the fourth functional unit 44 is designed as a reformer unit 50. The fourth functional unit 44 is fluidically connected between the third functional unit 42 and the fifth functional unit 46.

Via a process connection 54, the fuel cell device 10 is supplied with a fresh gas. The fresh gas consists of fresh natural gas and a recirculate, which is discharged via a second process connection 56 from the fuel cell device 10. The natural gas and the recirculate are combined outside the fuel cell device 10 via a connection 58 and compressed by means of a compressor 60. Alternatively, it would also be conceivable for the natural gas and the recirculate to be combined within the fuel cell device 10 via the connection 58.

The fresh gas is preheated in the third functional unit 42 by an anode exhaust gas of the fuel cell unit 12. For desulfurization of the natural gas, the third functional unit 42 may be preceded by a desulfurization unit, not shown here, in particular a hot desulfurization unit. It is then passed through the fourth functional unit 44 into the fifth functional unit 52, in which it is heated to a reaction temperature between 650 ° C and 850 ° C. The fourth functional unit 44, which is designed as a reformer unit 50, serves for an endothermic steam reforming of the long-chain alkanes present in natural gas (C _X H2 ( _X + D, where x> 1):

C _x H ₂ (x ₊ i) + x * H ₂ 0 x * CO + (2x + l) * H ₂ The fuel gas-containing reformate obtained by the fourth functional unit 18 is fed to the anode 20 of the fuel cell unit 12 where it is replaced by an electrochemical Reaction is reacted to generate electrical and thermal energy. A hot anode exhaust gas of the fuel cell unit 12 is passed into the fifth functional unit 52 in order to heat the fresh gas to the reaction temperature. Since the reformate is not completely convertible in the anode 20 of the fuel cell unit 12, a part of the anode exhaust gas, as already described, supplied to the fresh natural gas as recirculate. The remainder of the anode exhaust gas is supplied to the first functional unit 34. In the first functional unit 34 combustible constituents of the anode exhaust gas are post-combusted. The heat generated in the first functional unit 34 is used to heat an ambient air supplied to the fuel cell apparatus 10 via a third process connection 62 for the cathode 22 and to heat, for example, heating water and / or process water to a fifth process connection 64 , For the electrochemical reaction in the cathode 22, the ambient air in the second functional unit 36 is heated to the reaction temperature. After exiting the fuel cell unit 12, a cathode exhaust gas is passed directly into the first functional unit 34. In addition to a portion of the anode exhaust gas, natural gas may be supplied to the first functional unit 34 via a conduit 66. This may be necessary above all during a heating process of the fuel cell device 10.

Figure 2 shows a schematic external representation of an embodiment of a gas processor unit 26. The gas processor unit 26, in the case shown, the cathode gas processor 30, for the fuel cell device 10, has - as already explained - the first functional unit 34. In the case shown, the gas processor unit 26, or the cathode gas processor 30 is at least substantially cylindrical. The gas processor unit 26, or the cathode gas processor 30 shown, is characterized in particular by the fact that a first connection box 70 and a second connection box 72 are arranged, which are set up to supply exhaust gas. As a result of the embodiment of the connection boxes shown, the gas processor unit 26 or the cathode gas processor 30 can be better integrated into the fuel cell apparatus 10. Above all, the gas processing unit 26 can be more easily integrated into the fuel cell device 10 downstream of the fuel cell unit 12.

In the case shown, the first connection box 70 is set up to supply cathode exhaust gas and the second connection box 72 is designed to supply Anode exhaust, whereby cathode exhaust and anode exhaust gas can be fed in parallel.

In the exemplary embodiment shown, a third connection box 74, which is set up to supply cathode exhaust gas, is additionally arranged. The supply of cathode exhaust gas is additionally spatially distributed through the third connection box. Alternatively, it would also be conceivable that the third connection box 74 is provided for feeding anode exhaust gas. Alternatively, it is also conceivable that the first connection box 70 is arranged to supply anode exhaust gas and the second connection box 72 is adapted to supply cathode exhaust gas. It would also be conceivable that the third connection box 74 is set up to supply anode exhaust gas. In the exemplary embodiment shown, the cathode exhaust gas to be fed is fed to the first connection box 70 via a first supply line 76 and the third connection box 74 via a third supply line 80. At the same time, the second terminal box 72 is supplied with the anode exhaust gas to be fed via a second supply line 78.

As already mentioned, the first functional unit 34 is designed as a post-combustion unit 38. Thus, the fed anode gas is mixed with the supplied cathode gas inside the gas processing unit 26, and the cathode gas processor 30, effectively burned, wherein in the first functional unit 34, and in the Nachbrenneinheit 30, resulting hot exhaust gas, the gas processing unit 26 via a Exit opening 82 leaves.

In addition, the gas processor unit 26, or the cathode gas processor 30, as already mentioned, has a second functional unit 36, which is designed as a heat exchanger 40. The heat exchanger 40 is

Ambient air supplied via a fourth supply line 84, whereby a portion of the heat of the in the first functional unit 34, and the Nachbrenneinheit 38, resulting hot exhaust gas is transferred to the ambient air. Subsequently, the preheated ambient air leaves the second functional unit 36, or the heat exchanger 40, via a discharge line and, as shown in FIG. 1, the cathode 22 is supplied to the fuel cell unit 12. The exhaust gas of the first functional unit 34, or of the afterburner unit 38, which is partly cooled by the transfer of heat to the ambient air, is subsequently removed from the outlet opening 62 via the fifth process connection 62 shown in FIG Heating of heating water and / or service water can be used.

FIG. 3 shows a schematic cross-sectional representation of an exemplary embodiment of a gas processor unit 26 or of the cathode gas processor 30. It can be seen that the first functional unit 36, or the afterburner unit 38, has a combustion chamber 88, which is cylindrical in the interior of the gas processor 26 and is surrounded by the second functional unit 36, or the heat exchanger 40, in the manner of a shell. Thus, it can also be recognized that the heat exchanger 40 is designed as a coaxial heat exchanger 90, wherein the supplied ambient air to be heated is guided in opposite directions to the hot exhaust gas produced in the first functional unit 34 or the afterburning unit 38. The combustion chamber 88 is bounded by a cylindrical wall 92. The cylindrical wall 92 is part of the Koaxialwärmeübertragers 90 and thus also the second functional unit

36. The heat transfer from the hot exhaust gas to the ambient air which arises in the first functional unit 34, or the afterburning unit 38, as described in the preceding description, takes place via the cylindrical wall 92. However, the cylindrical wall 92 can also be at least partially understood as a part of the combustion chamber 88 and thus also the first functional unit 34.

The terminal boxes 70, 72, 73 are formed in the illustrated embodiment in a lower portion 94 of the gas processing unit 26. The first functional unit 34 has a wall 96, in the case shown a perforated plate

100, with a plurality of openings 102, wherein the junction boxes 70, 72, 74 are formed adjacent to the wall 96. As a result, a particularly compact construction is achieved, wherein the afterburner unit 38, or the combustion chamber 88, is effectively supplied with nozzle exhaust gas and anode exhaust gas through the openings 102 in a nozzle-like manner. Due to the nozzle-like feed of cathode exhaust gas and anode exhaust gas, combustion recirculation 88 is produced in the combustion chamber 88. Onsartige streams, or turbulence, just above the surface of the wall 96, which contribute positively to the mixing of the anode exhaust gas with the cathode exhaust gas and thus also for combustion in the combustion chamber 88. The said recirculation-like streams are located substantially laterally to the surface of the wall 96, especially at the openings 102.

4 shows a diagrammatic cross-sectional view of the lower region 94 of the gas processor unit 26 or of the cathode gas processor 30 from FIG. 3. Thus, it can be seen that at least one part, or a number, of the multiplicity of openings 102 is fluidically in each case at least one of the junction boxes 70, 72, 74 is assigned. In each case, the at least one part of the plurality of openings 102 is in each case formed in a subregion 104, 106, 108 which adjoins in each case at least one of the terminal boxes 70, 72, 74.

In the embodiment of Figure 4, three portions 104, 106, 108 are shown in which the openings 102 are formed. In this case, a first number of openings 110 is arranged in a circle in an inner portion 104, wherein the openings 110 are fluidly connected to the first connection box 70. In a central portion 106, a second number of openings 112 are also arranged in a circle, wherein the openings 112 are fluidly connected to the second connection box 72. In an outer portion 108, a third number of openings 114 are also arranged in a circle, wherein the openings 114 are fluidly connected to the third connection box 74.

The openings 102 may have different sizes. Thus, the openings 112 in the central portion 106 are smaller than the openings 110 in the inner portion 104 and the openings 114 in the outer portion 108. Thus, anode exhaust gas can be fed through the openings 112 in the central portion 106 at a higher speed in the combustion chamber 88 , which in turn favors the mixing of anode exhaust gas and cathode exhaust gas.

In addition, the terminal boxes 70, 72, 74 rotationally symmetric, or

circular symmetrical, formed, whereby on the one hand a compact design is sufficient and on the other a cost-effective production, for example by means of an injection molding process, is made possible.

Further, the junction boxes 70, 72, 74 are arranged along at least one direction according to their respective sizes. Whereby the supply lines 76, 78, 80 can be more easily connected to the terminal boxes, while at the same time ensuring the compactness of the gas processor unit 26. In the exemplary embodiment shown in FIG. 4, the terminal boxes 70,

72, 74 starting from the first terminal box 70, with a greatest spatial extent, arranged radially outwards with decreasing spatial extent. Put simply, the connection boxes form a pyramidal arrangement.

In the case shown, the connection boxes 70, 72, 74 are arranged concentrically, in particular in the radial direction, next to one another. Thus, the first terminal box 70 is formed cylindrically in the middle, wherein the second terminal box 72 is formed annularly around the first terminal box 70. Then, the third terminal box 74 is formed annularly around the second terminal box 72. Since the terminal box 70, 72, 74 are formed side by side in such a way, a corresponding concentric arrangement of the openings 102 can be realized, whereby a concentrically alternating supply of anode exhaust gas and cathode exhaust gas is made possible. This in turn favors the mixing of anode exhaust gas and cathode exhaust gas, which enables a particularly high-yield combustion.

FIG. 5 shows a schematic cross-sectional representation of a further exemplary embodiment of a gas processor unit 26 or of a cathode gas processor 30. In this case, at least two of the connection boxes 70, 72, 74 are arranged one inside the other, in the case shown the second connection box 72 within the first connection box 70. Thus, only the first terminal box 70 is required for the supply of cathode exhaust gas, whereby the formation of a third terminal box 74, as shown in the embodiment according to Figures 1 to 4, can be omitted. Accordingly, this is on the one hand the

Construction of the gas processor unit 26, or the cathode gas processor 30, more compact and on the other material costs are saved in a production of the gas processor unit.

In addition, the arrangement of a third supply line 80, as shown in the exemplary embodiments of FIGS. 1 to 4, is eliminated. Thus, only the first supply line 76 for the supply of cathode exhaust gas to the first junction box 70 and the second supply line 78 for the supply of anode exhaust gas to the second junction box 72 is arranged. In this case, the second supply line 78 extends partially within the first junction box 70, whereby the supply of anode exhaust gas to the second junction box 72 is made possible.

Moreover, in the exemplary embodiment shown in FIG. 5, the second functional unit 36, or the heat exchanger 30, is designed as a helical tube heat exchanger 120. The helical tube heat exchanger 120 is integrated into the combustion chamber 80 of the first functional unit 34, or the afterburner unit 38. As a result, the hot exhaust gas produced in the first functional unit 34 or the afterburning unit 38 can flow around the helical tubular heat exchanger 120.

In the embodiment shown, the fourth supply line 84 and the discharge line 86 are formed in the axial direction compared to the embodiment of Figures 1 to 4, which is based on the flow of ambient air also allows axial integration in a fuel cell device 10, whereby In turn, thermo-mechanical stresses, the number of joints and pressure losses are reduced.

In addition, the gas processing unit 26 shown in the lower portion 94 an expansion 126 of the combustion chamber 88, whereby the discharge line 86 can be passed through the combustion chamber 88 without affecting the combustion in the region of the openings 102.

Furthermore, in the exemplary embodiment shown in FIG. 5, a stowage tube 122 for stowage of hot exhaust gas of the afterburner unit 38 is arranged, whereby the hot exhaust gas of the afterburner unit 38 flows past the helical tube heat exchanger 120, which in turn causes the heat transfer. is effectively increased to the ambient air flowing in the helical heat exchanger ambient.

The pitot tube 122 is closed at one of the outlet opening 82 side facing. In the case shown, the pitot tube 122 is closed at the outlet opening 82 side facing by a plate 124. As a result, the resulting from the combustion in the Nachbrenneinheit 38 corrosions, in comparison to the closure of the other pipe end on a wall 96 side facing reduced. Furthermore, the exhaust-side pressure losses are reduced, since the hot exhaust gas can be expressed more continuously after combustion and does not strike a closing plate directly.

FIG. 6 shows a schematic cross-sectional representation of a further embodiment of a gas processor unit. In this case, an additional Abgasleitmittel 130, in the case shown a helical Abgasleitmittel 130, arranged, which is intended to lead hot exhaust gas of the afterburner unit 38 along the course of the helical Rohrwärmeübertragers 120, whereby the heat transfer is additionally increased to the guided in the helical tube heat exchanger 120 ambient air , In the case shown, the exhaust gas routing means 130 is an exhaust gas guide plate 132.

FIG. 7 shows a schematic cross-sectional representation of a further exemplary embodiment of a gas processor unit 26 or of the cathode gas processor 30. It can be seen that the first functional unit 34, or the afterburning unit 38, has an access 140, in the case shown a closable access 140, which represents a service opening 142. The access 140 can be closed or opened by a flap 144. Through the access 140, or the service opening 142, a maintenance, or cleaning, the afterburning unit 38 is made possible.

The access 140 is formed so as to be partially surrounded by the first terminal box 70. The access 140 is thus partially formed adjacent to the first terminal box 70. Thus, a part of the access 140 is formed by the first terminal box 70. As a result, the compactness of the gas processor unit 26 is ensured. FIG. 8 shows a schematic cross-sectional illustration of the lower region 94 of the exemplary embodiment of the gas processor unit 26 or of the cathode gas processor 30 from FIG. 7. It can be seen that in the wall 96, or the perforated plate 100, in addition to the openings 102, a larger opening 146 is formed. Thus, the access 140 is formed in part in the wall 96 of the first functional unit 26, and the afterburner unit 34, whereby the combustion chamber 88 of the afterburning unit 34 is accessible for maintenance.

Alternatively, it is also conceivable that the access 140 to another, for example, a second and / or third terminal box, adjacent or surrounded by another, such as the second and / or third terminal box. For example, it is also conceivable that the first connection box 70 shown in FIG. 4 is modified to an access 140. This could be accomplished by forming a flap similar to the flap 144 on the underside of the junction box 70 and a larger opening on the top of the junction box 70, similar to the larger opening 146 in the wall 96 or perforated plate 100, respectively is formed, whereby the combustion chamber 88 is accessible for maintenance.

FIG. 9 shows a schematic cross-sectional representation of a further exemplary embodiment of a gas processor unit 26 or of a cathode gas processor 30. In the illustrated embodiment, the second functional unit 36 is formed as a helical double tube heat exchanger 150, whereby the heat exchanging surface and thus also the heat transfer is increased to the ambient air flowing in the heat exchanger 40.

Furthermore, the length of the heat exchanger 40, or the helical Doppelrohrwärmeübertragers 150, can be reduced by the increased heat exchanging surface, which in turn pressure losses are minimized.

In the case shown, the helical double tube heat exchanger 150 is formed with a tubular transport 152, whereby the length of the individual tube coils 154, 156 is compensated. Thus, the pressure losses in the individual coiled tubing 154, 156 are compared with each other. The helical tube heat exchangers 120 shown in FIGS. 5 to 7 and / or the helical double tube heat exchangers 150 shown in FIG. 9 can also be understood as helical tube heat exchangers.

Claims

claims

Gas processor unit (26), in particular cathode gas processor (30), for a fuel cell device (10) which has at least one first functional unit (34), characterized in that at least one first terminal box (70) and at least one second terminal box (72) are arranged, which are set up to supply at least one exhaust gas.

Gas processor unit (26) according to the preceding claim, characterized in that the at least one first connection box (70) is arranged to supply cathode exhaust gas and the at least one second connection box (72) is arranged to supply anode exhaust gas. 3. Gas processor unit (26) according to one of the preceding claims, characterized in that the at least one first functional unit (34) is designed as a post-combustion unit (38) and / or the gas processor unit (26) has at least one second functional unit (36) is preferably formed as a heat exchanger (40).

4. Gas processor unit (26) according to one of the preceding claims, characterized in that at least one third connection box (74) which is set up to supply cathode exhaust gas or anode exhaust gas is arranged.

5. Gas processor unit (26) according to one of the preceding claims, characterized in that the at least one first functional unit (34) at least one wall (96), in particular a perforated plate (100) having a plurality of openings (102), wherein in particular, the connection boxes (70, 72, 74) are formed adjacent to the at least one wall (96).

6. Gas processor unit (26) according to claim 5, characterized in that in each case at least one part of the plurality of openings (102) is fluidically associated with at least one of the connection box (70, 72, 74).

7. Gas processor unit (26) according to any one of the preceding claims, characterized in that the terminal box (70, 72, 74) rotationally symmetrical, or circularly symmetrical, are formed.

8. Gas processor unit (26) according to any one of the preceding claims, characterized in that the connection box (70, 72, 74) are arranged ordered according to their respective size along at least one direction.

9. Gas processor unit (26) according to any one of the preceding claims, characterized in that the terminal box (70, 72, 74) are arranged concentrically, in particular in the radial direction, side by side.

10. Gas processor unit (26) according to one of the preceding claims, characterized in that at least two of the terminal box (70, 72, 74) are arranged inside one another, in particular the at least one second terminal box (72) within the at least one first terminal box (70) ,

11. Gas processor unit (26) according to one of claims 2 to 10, characterized in that the at least one second functional unit (36) is at least partially designed as a helical tube heat exchanger (120).

12. Gas processor unit (26) according to one of claims 2 to 11, characterized in that the at least second functional unit (36), in particular the helical tube heat exchanger (120), in the at least one first functional unit (34), preferably in a combustion chamber (88 ) of the afterburning unit (38) is integrated.

13. Gas processor unit (26) according to one of the preceding claims, characterized in that a pitot tube (122) for stowage of hot exhaust gas of the afterburner unit (38) is arranged.

14. Gas processor unit (26) according to one of the preceding claims, characterized in that at least one additional Abgasleitmittel (130), in particular helical Abgasleitmittel (130) is arranged, which is in particular provided for hot exhaust gas of the afterburner unit (38), preferably along a Course of the helical tube heat exchanger (120) to lead.

15. Gas processor unit (26) according to one of the preceding claims, characterized in that the at least one first functional unit (34) has at least one access (140), preferably closable access (140), in particular a service opening (142).

16. Gas processor unit (26) according to claim 13, characterized in that the at least one access in the at least one wall (96) of the at least one functional unit (34) and / or at least partially by at least one of the junction boxes (70, 72, 74) is trained.

17. Gas processor unit (26) according to one of claims 2 to 14, characterized in that the at least second functional unit (36) is at least partially designed as a helical double tube heat exchanger (150), in particular with at least one pipe transposition (152).

18. A fuel cell device (10) comprising at least one gas processor unit (26, 28) according to one of the preceding claims.