CN117645278A - Reforming reactor and fuel cell system - Google Patents

Abstract

The present application relates to a reforming reactor and a fuel cell system. The reforming reactor includes: a plurality of reforming assemblies arranged at intervals along the first direction; and the heat supply assembly comprises a heat exchange piece and a combustion unit, the heat exchange piece and the combustion unit are respectively abutted to two sides of the reforming assembly in the first direction, the heat exchange piece is used for conveying tail gas generated by the fuel cell stack so as to transfer heat to the reforming assembly, and the combustion unit is configured to provide heat to the reforming assembly by burning the tail gas. The high-temperature tail gas generated by the fuel cell stack is conveyed through the heat exchange piece on one side of the reforming assembly, so that heat generated by the fuel cell stack is transferred to the reforming assembly, and the reforming assembly is heated through the combustion unit combustion tail gas on the other side of the reforming assembly, so that the recycling of the fuel cell stack energy is realized, the energy conversion efficiency is improved, the energy consumption is reduced, and the use cost is reduced.

Description

Reforming reactor and fuel cell system

Technical Field

The present application relates to the technical field of fuel cells, and in particular to a reforming reactor and a fuel cell system.

Background

Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC for short) power generation is a high-efficiency, clean power generation technology that utilizes solid oxide as an electrolyte and a catalyst to generate electric energy by oxidation-reduction reactions of hydrogen and oxygen at high temperatures on an anode and a cathode, respectively. SOFCs have the advantages of high efficiency, low pollution, fuel flexibility, long life, etc.

Hydrogen used in SOFCs is often produced by a reforming reactor, and the reaction for producing hydrogen is an endothermic reaction, requiring a heating device to provide the heat required for the reaction. In the related art, a heat source is mainly provided for the reforming reactor in an electric heating manner. However, the electric heating mode has low energy conversion efficiency and low heating speed, and needs to consume a large amount of electric energy to complete the heating process, thereby increasing the use cost of the fuel cell system.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a reforming reactor and a fuel cell system that improve the energy conversion efficiency of the fuel cell system and reduce the use cost.

In a first aspect, the present application provides a reforming reactor for a fuel cell stack, the reforming reactor comprising: a plurality of reforming assemblies arranged at intervals along the first direction; and the heat supply assembly comprises a heat exchange piece and a combustion unit, the heat exchange piece and the combustion unit are respectively abutted to two sides of the reforming assembly in the first direction, the heat exchange piece is used for conveying tail gas generated by the fuel cell stack so as to transfer heat to the reforming assembly, and the combustion unit is configured to provide heat to the reforming assembly by burning the tail gas.

Because exothermic reaction occurs during the reaction of the fuel cell stack, the high-temperature tail gas generated by the fuel cell stack is conveyed through the heat exchange piece at one side of the reforming component, so that the heat generated by the fuel cell stack is transferred to the reforming component, and the reforming component is heated by burning the tail gas through the combustion unit at the other side of the reforming component, so that the reforming component can always be at the required working temperature. The heating mode exchanges heat through the high-temperature tail gas and provides heat through the combustion of the tail gas, so that the recycling of the fuel cell stack energy is realized, the energy conversion efficiency is improved, the energy consumption is reduced, and the use cost is reduced.

In one embodiment, the reforming assembly includes a reforming member having a reforming passage formed therein, the reforming passage being filled with a catalyst for catalyzing the conversion of a fuel gas into a gaseous mixture to be supplied to the fuel cell stack, and a blocking member disposed in the reforming passage at intervals in a flow direction of the fuel gas and capable of blocking the flow of the fuel gas.

In one embodiment, the barrier comprises a shielding portion arranged at a side facing away from the catalyst for blocking the flow of the fuel gas and a passage portion connected to the shielding portion arranged at a side facing towards the catalyst for allowing the fuel gas and/or the gaseous mixture to flow in the reforming channel.

In one embodiment, the combustion unit comprises a heating element, which is formed with a heating channel for the flow of the exhaust gases of the fuel cell stack, and an ignition element, which is connected to the side of the heating element facing away from the fuel cell stack, the ignition element being capable of igniting the exhaust gases in the heating channel.

In a second aspect, the present application provides a fuel cell system comprising: a reforming reactor as described above; and the fuel cell stack comprises an air inlet part and an air outlet part which are oppositely arranged, the air inlet part is connected with the reforming assembly, and the air outlet part is connected with the heat exchange piece.

In one embodiment, the fuel cell stack includes a first connection surface extending in a second direction, and the reforming reactor includes a second connection surface extending in the second direction, the first connection surface being capable of conforming to the second connection surface, the second direction intersecting the first direction.

In one embodiment, the fuel cell stack further includes a fixing portion extending from the first connection surface in the third direction, the fixing portion being configured to fix the reforming reactor such that the first connection surface is fitted to the second connection surface, and the first direction, the second direction, and the third direction intersect each other.

In one embodiment, the reforming reactor further comprises a receiving member for receiving the reforming assembly and the heating assembly, the receiving member being shape-fittingly connected to the fixing part.

In one embodiment, the fuel cell system further comprises a gas storage member connected to the heat exchange member and the combustion unit, the gas storage member being configured to store the exhaust gas flowing out through the heat exchange member and to convey the exhaust gas to the combustion unit.

In one embodiment, the fuel cell system further comprises a control coupled to the combustion unit and the reforming assembly, the control configured to control use of the combustion unit based on a temperature within the reforming assembly.

Drawings

FIG. 1 is a schematic diagram of a reforming reactor in an embodiment of the present application.

FIG. 2 is a partial schematic view of the gas inlet side of a reforming reactor in an embodiment of the present application.

FIG. 3 is a partial schematic view of the gas outlet side of a reforming reactor in an embodiment of the present application.

FIG. 4 is a schematic diagram of a reforming assembly in an embodiment of the present application.

FIG. 5 is a schematic diagram of a combustion unit in an embodiment of the present application.

Fig. 6 is a schematic view of a receptacle in an embodiment of the present application.

Fig. 7 is a schematic diagram of a fuel cell system in an embodiment of the present application.

Fig. 8 is a schematic view of an air intake side of a fuel cell stack in an embodiment of the present application.

Fig. 9 is a schematic diagram of an air outlet side of a fuel cell stack in an embodiment of the present application.

Fig. 10 is a schematic view of a fixing portion of a fuel cell stack in an embodiment of the present application.

Fig. 11 is a logic diagram of the operation of the fuel cell system in an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1-3, fig. 1-3 show schematic diagrams of reforming reactors in an embodiment of the present application. Referring to fig. 7, the reforming reactor 10 is used to generate a gaseous mixture required for the reaction of the fuel cell stack 20 after the fuel gas is subjected to the reforming reaction, and then to deliver the gaseous mixture to the fuel cell stack 20. Alternatively, the fuel gas is methanol, methane, natural gas, or the like.

Specifically, when methane is selected, the methane reacts in the reforming reactor 10 to generate hydrogen and carbon monoxide gas, which are then input into the fuel cell stack 20 to generate electricity, thereby effecting conversion of chemical energy into electrical energy.

In some embodiments, the reforming reactor 10 includes a reforming assembly 11 and a heating assembly. The reforming assembly 11 is the core of the reforming reactor 10 and serves to provide a place for the fuel gas to undergo a reforming reaction so that the fuel gas can be converted into a gaseous mixture. The heat supply unit is used for providing heat for the reforming unit 11, and further providing a high-temperature environment for the reforming reaction of the fuel gas, so that the reforming reaction can be smoothly performed.

The reforming assembly 11 is configured with a plurality of heat supply assemblies and is arranged at intervals along the first direction S1, the heat supply assemblies comprise heat exchange members 121 and combustion units 122, the heat exchange members 121 and the combustion units 122 are respectively abutted against two sides of the reforming assembly 11 in the first direction S1, the heat exchange members 121 are used for conveying tail gas generated by the fuel cell stacks 20 so as to transfer heat to the reforming assembly 11, and the combustion units 122 are configured to provide heat to the reforming assembly 11 by combusting the tail gas of the fuel cell stacks 20.

Since an exothermic reaction occurs when the fuel cell stack 20 reacts, the high temperature exhaust gas generated from the fuel cell stack 20 is transferred through the heat exchanging member 121 at one side of the reforming assembly 11, thereby transferring heat generated from the fuel cell stack 20 to the reforming assembly 11, and the exhaust gas is burned by the combustion unit 122 at the other side of the reforming assembly 11 to heat the reforming assembly 11, so that the reforming assembly 11 can always be at a desired operating temperature.

The heating mode carries out heat exchange through the high-temperature tail gas and provides heat through the combustion of the tail gas, and the recycling of the energy of the fuel cell stack 20 is realized through the recycling of the high-temperature tail gas, so that the energy conversion efficiency is improved, the energy consumption is reduced, and the use cost is reduced.

Further, to fully utilize the heat of the high temperature exhaust gas and the heat of the combustion of the exhaust gas, in some embodiments, two adjacent reforming assemblies 11 may share one heat exchange member 121 or one combustion unit 122. Preferably, the heat exchanging members 121 and the combustion units 122 are alternately arranged at one side of the reforming assembly 11 in the first direction S1, so that at low temperatures, the reforming assembly 11 can always be heated by the combustion unit 122, so that each reforming assembly 11 can be used normally, and the arrangement makes the elements of the reforming reactor 10 more compact, helps to reduce the volume of the reforming reactor 10, and realizes an integrated arrangement of the reforming reactor 10.

In some embodiments, referring to fig. 4, the reforming assembly 11 includes a reforming member 111 and a blocking member 112, the reforming member 111 having a reforming passage formed therein, the reforming passage being filled with a catalyst for catalyzing the conversion of fuel gas into a gaseous mixture for supply to the fuel cell stack 20, the fuel gas undergoing a reforming reaction catalyzed at a high temperature in the reforming passage.

The blocking members 112 are disposed in the reforming channels at intervals along the flow direction of the fuel gas, and divide the reforming channels into a plurality of reaction chambers. The blocking member 112 can block the flow of the fuel gas to reduce the flow rate of the fuel gas, so that the fuel gas in each reaction chamber can sufficiently contact and react with the catalyst, and the utilization rate of the fuel gas is improved.

Practically, referring to fig. 4, the barrier 112 includes a shielding portion 1121 and a passing portion 1122 connected to the shielding portion 1121, the shielding portion 1121 is disposed on a side facing away from the catalyst, the shielding portion 1121 is for blocking the flow of the fuel gas, the passing portion 1122 is disposed on a side facing toward the catalyst, and the passing portion 1122 is for allowing the fuel gas and/or the gaseous mixture to flow in the reforming passage.

Specifically, the shielding portion 1121 is configured to have a solid structure, and when the fuel gas contacts the shielding portion 1121, the shielding portion 1121 blocks the flow of the fuel gas, so that the fuel gas is forced to flow only to the passing portion 1122, thereby effectively increasing the contact area between the fuel gas and the catalyst and improving the reaction rate of the fuel gas. The passing portion 1122 is provided with a dense net-like passing hole so as to allow only a fuel gas having a small density to flow therethrough, thereby preventing the catalyst from flowing with the fuel gas, further ensuring the catalytic efficiency and the utilization rate of the catalyst, and simultaneously avoiding the transportation of impurities to the fuel cell stack 20.

Further, in an embodiment not shown, a heat exchange channel is formed inside the heat exchange member 121, and a blocking member is disposed in the heat exchange channel along the transmission direction of the high-temperature tail gas, so as to block the flow of the high-temperature tail gas, and improve the heat transfer efficiency of the high-temperature tail gas.

The two adjacent blocking members are only partially overlapped along the transmission direction of the high-temperature tail gas, namely the high-temperature tail gas is transmitted along the S-shaped path under the blocking effect of the blocking members, so that the flow speed of the high-temperature tail gas is slowed down, the residence time of the high-temperature tail gas in the heat exchange member 121 is prolonged, and the heat exchange efficiency is improved.

In some embodiments, in conjunction with fig. 5, the combustion unit 122 includes a heating member 1221 and an ignition member 1222, the heating member 1221 being formed with a heating channel for the flow of exhaust gas from the fuel cell stack 20, the ignition member 1222 being connected to a side of the heating member 1221 facing away from the fuel cell stack 20, the ignition member 1222 being capable of igniting the exhaust gas in the heating channel. The ignition element 1222 is, in the alternative, a spark plug. The exhaust gas is ignited to help improve the utilization rate of the exhaust gas, and stable heat can be provided for the reforming assembly 11 through combustion, so that the normal operation of the reforming assembly 11 is ensured.

The combustion unit 122 is operatively connected to the heat exchange member 121, and the high-temperature tail gas is cooled by heat exchange of the heat exchange member 121 and flows into the heating channel to be heated by combustion. This arrangement facilitates a further integration of the reforming reactor 10, reducing the transportation path of the tail gas. In other embodiments, the combustion unit 122 may be coupled to the fuel cell stack 20 and heated by directly igniting the exhaust of the fuel cell stack 20.

Further, the high-temperature exhaust gas generated by the combustion unit 122 may be directly treated and then discharged, or the high-temperature exhaust gas may be collected to preheat the fuel gas at the reforming inlet 1111, so as to improve the efficiency of the fuel gas reaction, and then the exhaust gas is treated and discharged, thereby reducing the influence on the environment.

Referring to fig. 7, in another aspect, the present application also provides a fuel cell system 100, the fuel cell system 100 including a reforming reactor 10 and a fuel cell stack 20. The reforming reactor 10 is the reforming reactor 10 in the above embodiment.

The fuel cell stack 20 is the core of the fuel cell system 100, and generates electrons and ions by causing a redox reaction of a gaseous mixture (e.g., hydrogen, etc.) and oxygen at high temperatures at an anode and a cathode, respectively. The ions are transferred to the cathode side through the electrolyte and react with oxygen to produce water vapor, carbon dioxide, or the like. The electrons flow through an external circuit to generate electrical energy.

Referring to fig. 8 to 9, the fuel cell stack 20 includes an air inlet portion 21 and an air outlet portion 22 disposed opposite to each other in a second direction S2, and the second direction S2 and the first direction S1 intersect each other. The air intake portion 21 is connected to the reforming assembly 11 so that the gaseous mixture generated through the reforming reaction can be delivered to the air intake portion 21 so that the fuel cell stack 20 can generate electric power. The air outlet 22 is connected to the heat exchanging member 121. The high-temperature tail gas generated after the reaction of the fuel cell stack 20 is conveniently transmitted to the heat exchange member 121 due to the higher operating temperature channel of the fuel cell, so as to provide heat for the reforming assembly 11.

Further, the fuel cell stack 20 further includes a stack body 23, and the air inlet portion 21 and the air outlet portion 22 are connected to both ends of the stack body 23 in the second direction S2, respectively. The gaseous mixture reacts with oxygen through the stack body 23, thereby generating electric power.

In some embodiments, the fuel cell stack 20 includes a first connection surface 25 extending along the second direction S2, the reforming reactor 10 includes a second connection surface 14 extending along the second direction S2, and the first connection surface 25 can be attached to the second connection surface 14, that is, the fuel cell stack 20 and the reforming reactor 10 in the present application can be integrally disposed, so as to reduce the occupied space of the fuel cell system 100 and improve the integration degree of the fuel cell system 100.

In particular, in the present embodiment, the fuel cell stack 20 is formed in a square shape as a whole, and the reforming reactor 10 is formed in a square shape as a whole, so that the combined installation of the fuel cell stack 20 and the reforming reactor 10 is facilitated, and the integration of the fuel cell system 100 is facilitated. The shape of the fuel cell stack 20 and the reforming reactor 10 is not limited in the present application as long as the first connecting surface 25 can be bonded to the second connecting surface 14 to assemble the fuel cell stack 20 and the reforming reactor 10.

In some embodiments, the fuel cell stack 20 further includes a fixing portion 24, where the fixing portion 24 is disposed by extending the first connecting surface 25 along the third direction S3, and the fixing portion 24 is used to fix the reforming reactor 10 such that the first connecting surface 25 is attached to the second connecting surface 14, and the first direction S1, the second direction S2, and the third direction S3 intersect each other. The fixing portion 24 is provided to facilitate fixing the reforming reactor 10 to the fuel cell stack 20, and to realize integrated mounting of the fuel cell system 100.

Further to the embodiment, referring to fig. 1 and 7, the reforming reactor 10 further includes a receiving member 13, the receiving member 13 is configured to receive the reforming assembly 11 and the heating assembly, and the receiving member 13 is connected to the fixing portion 24 in a shape-matching manner. Preferably, the accommodating member 13 is made of a heat insulating material resistant to high temperature, thereby helping to reduce heat dissipation and improving heating effect of the heat exchanging member 121 and the combustion unit 122. The arrangement of the receiving members 13 provides a receiving space for the reforming assembly 11 and the heating assembly on the one hand, thereby facilitating the integrated arrangement of the reforming reactor 10, and on the other hand, the receiving members 13 provide a mounting path for the reforming reactor 10, and the shape of the receiving members 13 is adjusted so that the reforming reactor 10 is adapted to different fixing portions 24.

In particular to the present embodiment, referring to fig. 6 and 10, the fixing portion 24 includes a bent portion 241 having a hook shape, the receiving member 13 is provided with a connection groove 131 corresponding to the hook shape, and the receiving member 13 can be inserted into the fixing portion 24 by shape matching of the connection groove 131 and the bent portion 241, thereby achieving a fixed connection of the reforming reactor 10 and the fuel cell stack 20.

In some embodiments, the fuel cell system 100 further includes a gas storage member, not shown, connected to the heat exchanging member 121 and the combustion unit 122, for storing the exhaust gas flowing out through the heat exchanging member 121 and delivering the exhaust gas to the combustion unit 122.

The setting of gas storage spare provides accommodation space for the tail gas after the heat transfer of heat transfer spare 121, helps the storage of tail gas, avoids the tail gas to scatter and disappear to the air and cause the waste of tail gas to the setting of gas storage spare helps controlling combustion unit 122, carries to combustion unit 122 through the control gas storage spare, thereby can control the tail gas content in the combustion unit 122, improves the utilization ratio of tail gas, and then improves the energy utilization ratio of fuel cell stack 20.

In particular, referring to fig. 2, 3, 8 and 9, an air inlet hole 211 is provided on a side of the air inlet portion 21 away from the pile body 23, an air outlet hole 221 is provided on a side of the air outlet portion 22 away from the pile body 23, the reforming member 111 includes a reforming air inlet end 1111 and a reforming air outlet end 1112, a heat exchange channel of the heat exchange member 121 includes a heat exchange air inlet end 1211 and a heat exchange air outlet end 1212, the heating member 1221 includes a heating air inlet end 1223 and a heating air outlet end 1224, the reforming air outlet end 1112 is communicated with the air inlet hole 211 through an exhaust pipe, the heat exchange air inlet end 1211 is communicated with the air outlet hole 221 through an exhaust pipe, the heat exchange air outlet end 1212 is connected with an air inlet of the air storage member through an exhaust pipe, thereby storing cooled tail gas in the air storage member, and an air outlet of the air storage member is connected with the heating air inlet end 1223 through an exhaust pipe, thereby delivering tail gas into the heating channel, and finally being discharged by the heating air outlet end 1224.

In some embodiments, the fuel cell system 100 further includes a control coupled to the combustion unit 122 and the reforming assembly 11, the control configured to control use of the combustion unit 122 based on a temperature within the reforming assembly 11.

Specifically, the reforming assembly 11 further includes a temperature measuring member 113, and the temperature measuring member 113 is disposed in the reforming passage and is used for measuring the temperature in the reforming passage, so as to determine whether the reforming reaction can be performed according to the temperature. Optionally, the temperature measuring element 113 is a temperature thermocouple. Further, the temperature measuring part 113 is connected to the control part so that the control part can obtain the temperature of the reforming passage, when the reforming passage temperature is low, the control part ignites the exhaust gas to provide heat to the reforming passage by controlling the ignition part 1222, and the control part can control the number of the combustion units 122 according to the temperature in the reforming passage.

The specific control logic of the control element is as follows: setting a reforming reaction temperature according to the corresponding fuel gas; determining whether the temperature of the reforming member 111 is lower than a preset temperature, and if so, controlling to activate all the combustion units 122; if not, it is determined whether the temperature of the reformer 111 is in the first temperature zone, if yes, the partial combustion unit 122 is controlled to supply heat, and if not, it is determined that the temperature of the reformer 111 is in the second temperature zone, and all the combustion units 122 are turned off.

For example, when the reforming reactor 10 includes four reforming assemblies 11, three heat exchanging members 121 and two combustion units 122, the heat exchanging members 121, the reforming assemblies 11, the combustion units 122 and the reforming assemblies 11 are sequentially arranged along the first direction S1, when the temperature measuring member 113 detects that the temperature in the reforming member 111 is lower than 700 ℃, the control member activates the two combustion units 122 to rapidly raise the temperature in the reforming member 111, when the temperature measuring member 113 detects that the temperature in the reforming member 111 is between 700 ℃ and 850 ℃, the control member turns off one of the combustion units 122, and activates only one of the combustion units 122; when the temperature measuring part 113 detects that the temperature in the reforming part 111 is 850 to 1000 ℃, the control part controls to turn off the two combustion units 122.

Referring to fig. 11, when the fuel cell system 100 in the present application is in operation, fuel gas enters the reforming channel of the reforming assembly 11 to react to generate a gaseous mixture, the gaseous mixture enters the pile body 23 from the air inlet portion 21 to generate electricity, high-temperature tail gas generated by the electricity generation enters the heat exchange member 121 through the air outlet portion 22, heat is supplied to the reforming assembly 11 through the heat exchange member 121, and the low-temperature tail gas after heat supply enters the air storage member for standby. When the heat supply of the heat exchange member 121 cannot meet the temperature requirement required by the reforming reaction of the fuel gas, the control member adjusts the tail gas in the gas storage member to enter the heating channel of the heating member 1221, and controls the ignition member 1222 to ignite the tail gas to supply heat for the reforming assembly 11, and then the high-temperature exhaust gas released by the heating member 1221 can be used for preheating the fuel gas at the inlet end of the reforming, and finally the exhaust gas is treated and discharged.

According to the energy recycling device, the high-temperature tail gas generated by power generation of the fuel cell stack 20 is supplied to the reforming assembly 11, so that energy recycling is realized, energy utilization efficiency is improved, and energy waste is reduced. The low-temperature tail gas in the gas storage piece is used as a standby energy source, so that extra heating capacity can be provided when the heating of the high-temperature tail gas cannot meet the requirement. The gas in the gas storage piece is regulated by the control piece to enter the combustion unit 122, and the tail gas is ignited to supply heat, so that the heat supply capacity can be flexibly regulated to meet the temperature requirement of the fuel gas reforming reaction. The fuel gas at the air inlet end of the reforming is preheated by the high-temperature exhaust gas of the combustion unit 122, so that the efficiency of the fuel gas reaction can be improved, the consumption of energy sources is reduced, the exhaust gas is discharged after being treated, and the pollution and the influence on the environment are reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A reforming reactor for a fuel cell stack, the reforming reactor comprising:

a reforming assembly configured with a plurality of reforming assemblies and arranged at intervals along a first direction; and

the heat supply assembly comprises a heat exchange piece and a combustion unit, the heat exchange piece and the combustion unit are respectively abutted to two sides of the reforming assembly in the first direction, the heat exchange piece is used for conveying tail gas generated by a fuel cell stack so as to transfer heat to the reforming assembly, and the combustion unit is configured to provide heat to the reforming assembly by combusting the tail gas.

2. The reforming reactor according to claim 1, wherein the reforming assembly comprises a reforming member having a reforming passage formed therein, the reforming passage being filled with a catalyst for catalyzing the conversion of fuel gas into a gaseous mixture to be supplied to the fuel cell stack, and a blocking member provided in the reforming passage at intervals in a flow direction of the fuel gas and capable of blocking the flow of the fuel gas.

3. A reforming reactor as claimed in claim 1, wherein the blocking member comprises a blocking portion arranged on a side facing away from the catalyst for blocking the flow of the fuel gas and a passing portion connected to the blocking portion arranged on a side facing toward the catalyst for causing the fuel gas and/or the gaseous mixture to flow in the reforming passage.

4. A reforming reactor as claimed in claim 1, wherein the combustion unit comprises a heating member formed with a heating channel through which the exhaust gas of the fuel cell stack flows, and an ignition member connected to a side of the heating member facing away from the fuel cell stack, the ignition member being capable of igniting the exhaust gas in the heating channel.

5. A fuel cell system, characterized in that the fuel cell system comprises:

a reforming reactor according to any one of claims 1 to 4; and

the fuel cell stack comprises an air inlet part and an air outlet part which are oppositely arranged, wherein the air inlet part is connected with the reforming assembly, and the air outlet part is connected with the heat exchange piece.

6. The fuel cell system according to claim 5, wherein the fuel cell stack includes a first connection surface extending in a second direction, the reforming reactor includes a second connection surface extending in the second direction, the first connection surface is capable of conforming to the second connection surface, and the first direction and the second direction intersect each other.

7. The fuel cell system according to claim 6, wherein the fuel cell stack further comprises a fixing portion provided extending from the first connecting surface in a third direction, the fixing portion being configured to fix the reforming reactor such that the first connecting surface is fitted to the second connecting surface, the first direction, the second direction, and the third direction intersecting each other.

8. The fuel cell system of claim 7, wherein the reforming reactor further comprises a receiving member for receiving the reforming assembly and the heating assembly, the receiving member being shape-matingly coupled to the fixing portion.

9. The fuel cell system according to claim 5, further comprising a gas storage member connected to the heat exchanging member and the combustion unit, the gas storage member for storing the exhaust gas flowing out through the heat exchanging member and delivering the exhaust gas to the combustion unit.

10. The fuel cell system of any of claims 5-9, further comprising a control coupled to a combustion unit and the reforming assembly, the control configured to control use of the combustion unit based on a temperature within the reforming assembly.