Control method and assembly for controlling a reformer temperature
Patent Information
- Application Number
- PCT/AT2025/060095
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-06
- Filing Date
- 2025-03-05
- Publication Date
- 2025-10-02
AI Technical Summary
Existing reformer systems struggle to efficiently maintain the reforming temperature within a specific range, leading to inefficiencies and potential overheating.
A control method and arrangement that utilize a high-temperature valve to divide the reformer gas stream into feed and bypass streams, passing the feed stream through a reformer and the bypass stream over an oxidation catalyst, allowing for precise temperature control by adjusting the flow through the valve and bypassing gas through the catalyst.
Enables efficient and stable temperature regulation of the reformer, preventing overheating and enhancing the reforming process by balancing gas flows and utilizing oxidation catalysts to purify exhaust gases.
Smart Images
Figure AT2025060095_02102025_PF_FP_ABST
Abstract
Description
[0001] Control method and arrangement for controlling a reformer temperature
[0002] The present invention relates to a control method for controlling a reformer temperature, an arrangement for controlling a reformer temperature and a fuel cell system having such an arrangement.
[0003] It is known in the art that a reformer can be used to produce a hydrogen-containing reformate or synthesis gas from a fuel. In this steam reforming process, hydrogen is produced from carbon-containing energy sources and water. Catalysts are used for steam reforming. It is also important that the reformer maintains a reforming temperature within a specific temperature range.
[0004] Against this background, one object of the present invention is to efficiently and appropriately temper a reformer.
[0005] The above object is achieved by a control method for controlling a reformer temperature having the features of claim 1, an arrangement for controlling a reformer temperature having the features of claim 10, and a fuel cell system having the features of claim 16. Further features and details of the invention emerge from the subclaims, the description, and the drawings. Features and details described in connection with the control method according to the invention naturally also apply in connection with the arrangement according to the invention and the fuel cell system according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is or can always be made reciprocally.
[0006] Accordingly, a control method for controlling a reformer temperature is described. The control method comprises the following steps:
[0007] Dividing a reformer gas stream into a reformer feed gas stream and a reformer bypass gas stream by means of a reformer gas flow divider, passing the reformer feed gas stream through a high-temperature valve and a steam reformer,
[0008] Passing the stream of reformer bypass gas over an oxidation catalyst for purifying exhaust gases, wherein the high-temperature valve controls the passage of the stream of reformer feed gas through the high-temperature valve and the reformer to thereby control the reformer temperature.
[0009] By controlling the flow of reformer feed gas through the reformer using the high-temperature valve, the proportion of reformer gas flowing through the reformer as reformer feed gas and the proportion of reformer gas flowing through the oxidation catalyst as reformer bypass gas are simultaneously controlled. The flow through the high-temperature valve determines the mass flow of the reformer feed gas through the reformer. This allows the reformer temperature to be controlled using the high-temperature valve.
[0010] The more the high-temperature valve restricts the passage of the reformer feed gas, the more reformer gas flows over the oxidation catalyst as reformer bypass gas. The flow path with the oxidation catalyst therefore represents a bypass. The more the high-temperature valve is closed, the higher the pressure in the reformer feed gas stream becomes, so that more reformer gas flows into the bypass with the oxidation catalyst as reformer bypass gas.
[0011] In the context of the invention, a control method is understood in particular to mean a control method; particularly preferably, a control method is used as a synonym for a control method.
[0012] The high-temperature valve can be designed as a butterfly valve. Furthermore, the high-temperature valve can be continuously adjustable. In particular, it is possible to adjust the high-temperature valve electronically. The flow rate of the high-temperature valve can be set between 0% and 100%. Furthermore, the high-temperature valve is particularly suitable for high temperatures. The reformer can be part of a fuel cell system. The fuel cell system can comprise one or more fuel cell stacks. The multiple fuel cell stacks can, in turn, form part of a fuel cell stack tower.
[0013] A reformer is a device that can produce hydrogen, a hydrogen-containing reformate, and / or a synthesis gas from a fuel. The chemical reaction is based on steam reforming. Steam reforming is a process for producing hydrogen from carbon-containing energy sources and water.
[0014] The oxidation catalyst reduces the proportion of carbon monoxide, hydrocarbons, and / or formaldehyde in the combustion exhaust gases. It converts gaseous pollutants into harmless substances, such as carbon dioxide and / or water, through oxidation.
[0015] The reformer feed gas stream is passed through a high-temperature valve and a reformer. This can mean that the reformer feed gas stream flows through the high-temperature valve and the reformer. Heat exchange can occur between the reformer feed gas stream and the reformer. Heat energy is exchanged between the reformer feed gas and the reformer. In this way, the reformer temperature or the reformate equilibrium temperature can be controlled using the reformer feed gas stream.
[0016] The reformer bypass gas stream is passed over an oxidation catalyst. This can mean that the reformer bypass gas stream flows through the oxidation catalyst. This reformer bypass gas is essentially oxygen-depleted air from the fuel cell stack. It is mixed with the anode exhaust gas, particularly in the bypass. This (now combustible) mixture is converted, particularly in the oxidation catalyst. Without the mixture with the anode exhaust gas, the reformer bypass gas cannot be converted or it would not burn.
[0017] According to one embodiment of the control method, the flow of reformer bypass gas has a higher pressure than the flow of reformer feed gas. This advantageously ensures that the high-temperature valve is functioning. The high-temperature valve can thus be used to control the flow of reformer feed gas through the reformer. This, in turn, allows the temperature of the reformer to be adjusted.
[0018] In particular, the flow of reformer bypass gas and the flow of reformer feed gas can be essentially balanced in terms of pressure. For this purpose, it may be important that the mass flows through both paths, ie, the mass flow of the reformer bypass gas flow and the mass flow of the reformer feed gas flow, are essentially equal.
[0019] According to a further embodiment of the control method, the reformer feed gas stream first flows through the high-temperature valve and then through the reformer. Advantageously, the high-temperature valve is arranged upstream of the reformer in the flow direction of the reformer feed gas. A pressure loss of the oxidation catalyst cannot be controlled, which is why the high-temperature valve is arranged upstream of the reformer. This arrangement of the high-temperature valve upstream of the reformer makes it possible for no flow to occur on one heating side of the reformer during nominal operation. This is referred to as adiabatic operation.
[0020] According to a further embodiment of the control method, the pressure loss of the reformer bypass gas flow at the oxidation catalyst is greater than the pressure loss of the reformer feed gas flow at the reformer. This ensures that more mass flow flows through the reformer than through the oxidation catalyst. In combination with the high-temperature valve, it can be additionally controlled to prevent the reformer from overheating, i.e., the "excess" mass flow is directed through the oxidation catalyst. The mass flow through the oxidation catalyst is therefore solely the result of the control of the mass flow through the reformer.
[0021] According to a further embodiment of the control method, the stream of reformer feed gas after flowing through the reformer and the stream of reformer bypass gas after flowing through the oxidation catalyst are combined into one exhaust gas stream by means of an exhaust gas flow connector. As a result, the reformer in the stream of reformer feed gas and the oxidation catalyst in the stream of reformer bypass gas are arranged parallel to each other.
[0022] According to a further embodiment of the control method, the reformer gas stream is formed by a stream of diverted supply air and a stream of cathode exhaust gas. The diverted supply air stream and the stream of cathode exhaust gas can be combined by means of a reformer gas flow connector. In particular, the diverted supply air stream and the stream of cathode exhaust gas can be additionally mixed in a reformer gas mixer.
[0023] The branched supply air stream is branched from a supply air stream. The supply air stream supplied to the cathode feed gas section of the fuel cell stack is referred to as the cathode feed gas stream. The cathode exhaust gas stream is diverted from the cathode exhaust gas section of the fuel cell stack.
[0024] According to a further embodiment of the control method, a stream of oxidation catalyst feed gas, which is formed from the reformer bypass gas stream and a stream of anode exhaust gas, is passed through the oxidation catalyst. The reformer bypass gas stream and the anode exhaust gas stream can be combined by means of an oxidation catalyst flow connector. In particular, the reformer bypass gas stream and the anode exhaust gas stream can be additionally mixed in an oxidation catalyst gas mixer. The anode exhaust gas stream is diverted from the anode exhaust gas section of the fuel cell stack.
[0025] According to a further embodiment of the control method, an anode exhaust high-temperature valve is inserted into the anode exhaust stream to control which portion of the anode exhaust stream flows through the oxidation catalyst. The anode exhaust high-temperature valve is arranged upstream of the oxidation catalyst flow connector in the flow direction of the anode exhaust stream.
[0026] According to a further embodiment of the control method, the anode exhaust gas stream is divided into an anode exhaust gas portion, which flows through the oxidation catalyst, and an anode exhaust gas recycle gas portion, which is fed to a fuel feed gas stream. The fuel feed gas stream is reformed in the reformer. The reformed gas is fed to the anode feed gas section of the fuel cell stack as an anode feed gas stream. Heat exchange between the anode exhaust gas stream and the anode feed gas stream can take place via a fuel heat exchanger.
[0027] Furthermore, an arrangement for controlling a reformer temperature is described. The arrangement comprises a reformer gas flow splitter for dividing a stream of reformer gas into a stream of reformer feed gas and a stream of reformer bypass gas, a reformer for steam reforming, wherein the reformer is arranged in the stream of reformer feed gas, a high-temperature valve for controlling the passage of the reformer feed gas stream through the high-temperature valve and the reformer to thereby control the reformer temperature, wherein the high-temperature valve is arranged in the stream of reformer feed gas, and an oxidation catalyst for purifying exhaust gases, wherein the oxidation catalyst is arranged in the stream of reformer bypass gas.
[0028] The reformer gas flow divider, the reformer, the high-temperature valve, and the oxidation catalyst are particularly designed for carrying out a method according to the invention for controlling a reformer temperature. Thus, the arrangement according to the invention for controlling a reformer temperature has the same advantages as those described for the method according to the invention for controlling a reformer temperature.
[0029] According to one embodiment of the arrangement, the high-temperature valve is arranged upstream of the reformer in the flow direction of the reformer feed gas stream. Advantageously, the high-temperature valve is arranged upstream of the reformer, since a pressure loss of the oxidation catalyst cannot be controlled. According to a further embodiment of the arrangement, the arrangement has an exhaust gas flow connector which connects the reformer feed gas stream and the reformer bypass gas stream to form an exhaust gas stream. The exhaust gas flow connector is arranged downstream of the reformer in the flow direction of the reformer feed gas stream and downstream of the oxidation catalyst in the flow direction of the reformer bypass gas stream. Advantageously, the reformer in the reformer feed gas stream and the oxidation catalyst in the reformer bypass gas stream are therefore arranged parallel to one another.
[0030] According to a further embodiment of the arrangement, the arrangement comprises a reformer gas flow connector that connects a stream of branched supply air and a stream of cathode exhaust gas to the reformer gas stream. Furthermore, a reformer gas mixer can be arranged downstream of the reformer gas flow connector in the flow direction of the reformer gas stream. The reformer gas mixer can be used to thoroughly mix the reformer gas stream.
[0031] According to a further embodiment of the arrangement, the arrangement comprises an oxidation catalyst flow connector that connects the reformer bypass gas stream and a stream of anode exhaust gas to form a stream of oxidation catalyst feed gas. The oxidation catalyst flow connector is arranged in the reformer bypass gas stream between the reformer gas flow divider and the oxidation catalyst.
[0032] The oxidation catalyst feed gas is passed through the oxidation catalyst. Furthermore, the arrangement can comprise an oxidation catalyst gas mixer arranged between the oxidation catalyst flow connector and the oxidation catalyst. The oxidation catalyst gas mixer can mix the stream of oxidation catalyst feed gas, i.e., the stream of reformer bypass gas, and the stream of anode exhaust gas.
[0033] According to a further embodiment of the arrangement, an anode exhaust high-temperature valve is arranged in the anode exhaust stream for controlling the flow of the anode exhaust stream through the oxidation catalyst. In particular, the anode exhaust high-temperature valve is arranged upstream of the oxidation catalyst flow connector in the flow direction of the anode exhaust stream.
[0034] The arrangement may further comprise an anode exhaust flow divider. The anode exhaust flow divider divides the anode exhaust flow into an anode exhaust gas portion, which flows through the oxidation catalyst, and an anode exhaust gas recycle portion, which is fed to a fuel feed gas stream.
[0035] The fuel feed gas stream is reformed in the reformer. The reformed gas is fed to the anode feed gas section of the fuel cell stack as an anode feed gas stream. The arrangement may further comprise a fuel heat exchanger. Heat exchange between the anode exhaust gas stream and the anode feed gas stream can occur via the fuel heat exchanger.
[0036] A fuel cell system is also described. The fuel cell system comprises at least one fuel cell stack for generating electrical power and at least one arrangement according to the invention for controlling a reformer temperature.
[0037] The fuel cell system may comprise one or more fuel cell stacks. The multiple fuel cell stacks may, in turn, form part of a fuel cell stack tower.
[0038] Further possible implementations of the invention also include combinations of features described above or below with respect to the exemplary embodiments that are not explicitly mentioned. In this case, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.
[0039] Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments are described in detail with reference to the drawing. Figure 1 shows a schematic view of a fuel cell system according to the invention, comprising a fuel cell stack and an arrangement according to the invention for controlling a reformer temperature.
[0040] Fig. 1 shows a schematic view of a fuel cell system 100 according to the invention, comprising a fuel cell stack 110 for generating electrical power and an arrangement 10 according to the invention for controlling a reformer temperature. Alternatively, the fuel cell system 100 can have multiple fuel cell stacks 110. The multiple fuel cell stacks 110 can be part of a fuel cell stack tower. Likewise, multiple arrangements 10 can be provided.
[0041] The fuel cell stack 110 shown in Fig. 1 has a cathode supply gas section 60 for supplying a stream of cathode supply gas KZG, a cathode exhaust gas section 62 for discharging a stream of cathode exhaust gas KAG, an anode exhaust gas section 64 for discharging a stream of anode exhaust gas AAG and an anode supply gas section 66 for supplying a stream of anode supply gas AZG.
[0042] The arrangement 10 for controlling a reformer temperature comprises a reformer gas flow divider 28, a reformer 20, a high-temperature valve 30, and an oxidation catalyst 40. The reformer gas flow divider 28 serves to divide a stream of reformer gas 22 into a stream of reformer feed gas 24 and a stream of reformer bypass gas 26. The reformer 20 is used for steam reforming. The reformer 20 is arranged in the stream of reformer feed gas 24. The high-temperature valve 30 serves to control the passage of the stream of reformer feed gas 24 through the high-temperature valve 30 and the reformer 20. By controlling the passage of the stream of reformer feed gas 24, the reformer temperature can also be controlled. The high-temperature valve 30, like the reformer 20, is arranged in the stream of reformer feed gas 24. The oxidation catalyst 40 is used to purify exhaust gases.The oxidation catalyst 40 is arranged in the stream of reformer bypass gas 26.
[0043] The high-temperature valve 30 controls the proportion of reformer gas 22 that flows through the reformer 20 as reformer feed gas 24 and the proportion of reformer gas 22 that flows through the oxidation catalyst 40 as reformer bypass gas 26. The path through the oxidation catalyst 40 represents a bypass. The passage through the high-temperature valve 30 determines the mass flow of the reformer feed gas 24 through the reformer 20 and thus the reformer temperature.
[0044] The high-temperature valve 30 is arranged upstream of the reformer 20 in the flow direction of the reformer feed gas stream 24. Accordingly, the reformer feed gas stream 24 flows first through the high-temperature valve 30 and then through the reformer 20.
[0045] From an air supply device 70, a stream of supply air 72 is conducted as a stream of cathode supply gas KZG to the cathode supply gas section 60. A stream of branched supply air 32 is branched off from the stream of supply air 72.
[0046] The arrangement 10 can have a reformer gas flow connector 12. The reformer gas flow connector 12 connects the flow of branched supply air 32 and the flow of cathode exhaust gas KAG to the flow of reformer gas 22. Furthermore, a reformer gas mixer 74 can be arranged downstream of the reformer gas flow connector 12 in the flow direction of the reformer gas 22 flow. With the aid of the reformer gas mixer 74, the flow of reformer gas 22, which is formed by the flow of branched supply air 32 and the flow of cathode exhaust gas KAG, can be thoroughly mixed.
[0047] Furthermore, the arrangement 10 can have an exhaust flow connector 42. The exhaust flow connector 42 connects the stream of reformer feed gas 24 and the stream of reformer bypass gas 26 to form a stream of exhaust gas 44. The stream of exhaust gas 44 is directed to an exhaust device 76. The exhaust flow connector 42 is arranged downstream of the reformer 20 in the flow direction of the reformer feed gas 24 and downstream of the oxidation catalyst 40 in the flow direction of the reformer bypass gas 26. Accordingly, the reformer 20 in the stream of reformer feed gas 24 and the oxidation catalyst 40 in the stream of reformer bypass gas 26 are arranged parallel to one another.
[0048] The assembly 10 may also include an oxidation catalyst flow connector 48 that connects the reformer bypass gas stream 26 and the anode exhaust gas stream AAG to form a stream of oxidation catalyst feed gas 46. The oxidation catalyst flow connector 48 is disposed in the reformer bypass gas stream 26 between the reformer gas flow divider 28 and the oxidation catalyst 40. Optionally, the assembly 10 may include an oxidation catalyst gas mixer 78 disposed between the oxidation catalyst flow connector 48 and the oxidation catalyst 40. The oxidation catalyst gas mixer 78 serves to mix the stream of oxidation catalyst feed gas 46, which is formed from the stream of reformer bypass gas 26 and the stream of anode exhaust gas AAG.
[0049] In an optional embodiment, the assembly 10 may include an anode exhaust high-temperature valve 50 for controlling the flow of the anode exhaust AAG stream through the oxidation catalyst 40. The anode exhaust high-temperature valve 50 is disposed in the anode exhaust AAG stream.
[0050] Additionally, the arrangement may include an anode exhaust flow divider 80. The anode exhaust flow divider 80 divides the anode exhaust flow AAG into an anode exhaust gas portion 52 and an anode exhaust gas recirculation gas portion 54. The anode exhaust gas portion 52 flows through the oxidation catalyst 40. In contrast, the anode exhaust gas recirculation gas portion 54 is fed to a fuel feed gas stream 34 at a fuel feed gas flow connector 92.
[0051] The fuel feed gas stream 34 is supplied from a fuel supply vessel 90 to the reformer 20 and reformed in the reformer 20. The reformed gas is supplied to the anode feed gas section 66 of the fuel cell stack 110 as anode feed gas stream AZG.
[0052] The arrangement 10 can further comprise a fuel heat exchanger 82. Heat exchange between the anode exhaust gas stream AAG and the anode feed gas stream AZG can take place via the fuel heat exchanger 82.
[0053] Optionally, a protective gas container 94 can be provided. From the protective gas container 94, a flow of protective gas 96 can be directed into the flow of fuel supply gas 34 via a protective gas flow connector 98. The assembly 10 is particularly configured to perform the following control method for controlling a reformer temperature. The control method comprises the steps described below.
[0054] In a first step, a stream of reformer gas 22 is divided into a stream of reformer feed gas 24 and a stream of reformer bypass gas 26 by means of the reformer gas flow divider 28.
[0055] In a second step, the stream of reformer feed gas 24 is passed through a high-temperature valve 30 and a reformer 20 for steam reforming.
[0056] In a third step, the reformer bypass gas stream 26 is passed through an oxidation catalyst 40 to purify exhaust gases. In particular, these steps are carried out simultaneously.
[0057] The high-temperature valve 30 can be used to control the flow of reformer feed gas 24 through the high-temperature valve 30 and the reformer 20. By controlling the flow of reformer feed gas 24, the reformer temperature can, in turn, be controlled. In particular, the high-temperature valve 30 also indirectly controls the flow of reformer bypass gas 26, meaning that the setting of the high-temperature valve 30 determines how much flows through the bypass.
[0058] In one embodiment, the stream of reformer bypass gas 26 may have a higher pressure than the stream of reformer feed gas 24. Furthermore, a pressure drop of the stream of reformer bypass gas 26 at the oxidation catalyst 40 may be greater than a pressure drop of the stream of reformer feed gas 24 at the reformer 20.
[0059] List of reference symbols
[0060] 10 Arrangement
[0061] 12 reformer gas flow connectors
[0062] 20 reformers
[0063] 22 Electricity from reformer gas
[0064] 24 Electricity from reformer feed gas
[0065] 26 Electricity from reformer bypass gas
[0066] 28 reformer gas flow dividers
[0067] 30 High-temperature valve
[0068] 32 Flow from branched supply air
[0069] 34 Electricity from fuel feed gas
[0070] 40 Oxidation catalyst
[0071] 42 exhaust flow connectors
[0072] 44 Electricity from exhaust gas
[0073] 46 Stream from oxidation catalyst feed gas
[0074] 48 Oxidation catalyst flow connectors
[0075] 50 Anode exhaust high-temperature valve
[0076] 52 Anode exhaust gas exhaust gas share
[0077] 54 Anode exhaust gas recirculation gas share
[0078] 60 Cathode supply gas section
[0079] 62 Cathode exhaust section
[0080] 64 Anode exhaust section
[0081] 66 Anode feed gas section
[0082] 70 Supply air device
[0083] 72 Electricity from supply air
[0084] 74 reformer gas mixers
[0085] 76 Exhaust device 78 Oxidation catalyst gas mixer
[0086] 80 anode exhaust flow dividers
[0087] 82 fuel heat exchangers
[0088] 90 fuel supply tanks
[0089] 92 Fuel supply gas flow connector
[0090] 94 protective gas containers
[0091] 96 Power from protective gas
[0092] 98 shielding gas flow connectors
[0093] 100 fuel cell system
[0094] 110 fuel cell stacks
[0095] KZG power from cathode feed gas
[0096] KAG electricity from cathode exhaust gas
[0097] AAG electricity from anode exhaust gas
[0098] AZG electricity from anode feed gas
Claims
Patent claims 1. A control method for controlling a reformer temperature, comprising the steps of: Dividing a stream of reformer gas (22) into a stream of reformer feed gas (24) and a stream of reformer bypass gas (26) by means of a reformer gas flow divider (28), Passing the stream of reformer feed gas (24) through a high-temperature valve (30) and a reformer (20) for steam reforming, Passing the stream of reformer bypass gas (26) over an oxidation catalyst (40) for purifying exhaust gases, wherein the passage of the stream of reformer feed gas (24) through the high-temperature valve (30) and the reformer (20) is controlled by means of the high-temperature valve (30) in order to thereby control the reformer temperature.
2. Control method according to claim 1, characterized in that the stream of reformer bypass gas (26) has a higher pressure than the stream of reformer feed gas (24).
3. Control method according to claim 1 or 2, characterized in that the stream of reformer feed gas (24) flows first through the high-temperature valve (30) and then through the reformer (20).
4. Control method according to one of the preceding claims, characterized in that a pressure loss of the stream of reformer bypass gas (26) at the oxidation catalyst (40) is greater than a pressure loss of the stream of reformer feed gas (24) at the reformer (20).
5. Control method according to one of the preceding claims, characterized in that the stream of reformer feed gas (24) after flowing through the reformer (20) and the stream of reformer bypass gas (26) after flowing through the oxidation catalyst (40) are combined by means of an exhaust gas flow connector (42) to form a stream of exhaust gas (44).
6. Control method according to one of the preceding claims, characterized in that the stream of reformer gas (22) is formed by a stream of branched supply air (32) and a stream of cathode exhaust gas (KAG).
7. Control method according to one of the preceding claims, characterized in that a stream of oxidation catalyst feed gas (46), which is formed from the stream of reformer bypass gas (26) and a stream of anode exhaust gas (AAG), is passed through the oxidation catalyst (40).
8. Control method according to claim 7, characterized in that an anode exhaust high temperature valve (50) is inserted into the anode exhaust gas (AAG) stream to control which portion of the anode exhaust gas (AAG) stream flows through the oxidation catalyst (40).
9. Control method according to one of claims 7 or 8, characterized in that the stream of anode exhaust gas (AAG) is divided into an anode exhaust gas portion (52) which flows through the oxidation catalyst and an anode exhaust gas recirculation gas portion (54) which is fed to a stream of fuel feed gas (34).
10. An arrangement (10) for controlling a reformer temperature, characterized by a reformer gas flow divider (28) for dividing a stream of reformer gas (22) into a stream of reformer feed gas (24) and a stream of reformer bypass gas (26), a reformer (20) for steam reforming, wherein the reformer (20) is arranged in the stream of reformer feed gas (24), a high-temperature valve (30) for controlling the passage of the stream of reformer feed gas (24) through the high-temperature valve (30) and the reformer (20) to thereby control the reformer temperature, wherein the high-temperature valve (30) is arranged in the stream of reformer feed gas (24), and an oxidation catalyst (40) for purifying exhaust gases, wherein the oxidation catalyst (40) is arranged in the stream of reformer bypass gas (26).
11. Arrangement (10) according to claim 10, characterized in that the high-temperature valve (30) is arranged upstream of the reformer (20) in the flow direction of the stream of reformer feed gas (24).
12. Arrangement (10) according to claim 10 or 11, characterized in that the arrangement (10) has an exhaust gas flow connector (42) which connects the flow of reformer feed gas (24) and the flow of reformer bypass gas (26) to form a flow of exhaust gas (44), wherein the exhaust gas flow connector (42) is arranged downstream of the reformer (20) in the flow direction of the flow of reformer feed gas (24) and downstream of the oxidation catalyst (40) in the flow direction of the flow of reformer bypass gas (26).
13. Arrangement (10) according to one of claims 10 to 12, characterized in that the arrangement (10) has a reformer gas flow connector (12) which connects a flow of branched supply air (32) and a flow of cathode exhaust gas (KAG) to the flow of reformer gas (22).
14. Arrangement (10) according to one of claims 10 to 13, characterized in that the arrangement (10) has an oxidation catalyst flow connector (48) which connects the stream of reformer bypass gas (26) and a stream of anode exhaust gas (AAG) to a stream of oxidation catalyst feed gas (46), wherein the oxidation catalyst flow connector (48) is arranged in the stream of reformer bypass gas (26) between the reformer gas flow divider (28) and the oxidation catalyst (40).
15. Arrangement (10) according to claim 14, characterized in that an anode exhaust high temperature valve (50) for controlling the flow of the anode exhaust gas (AAG) stream through the oxidation catalyst (40) is arranged in the anode exhaust gas (AAG) stream.
16. Fuel cell system (100), characterized by at least one fuel cell stack (110) for generating electrical power and at least an arrangement (10) for controlling a reformer temperature according to one of claims 10 to 15.