Fuel reformer for SOFC (Solid Oxide Fuel Cell) and SOFC system

Abstract

The invention discloses a fuel reformer for an SOFC (Solid Oxide Fuel Cell) and an SOFC system. The reformer comprises a shell and a ventilation device, the ventilation device comprises inner pipes and outer pipes, the ventilation device is arranged in the shell, a third cavity is formed in each inner pipe, a second cavity is formed between each inner pipe and the corresponding outer pipe, a first cavity is formed between the corresponding outer pipe and the shell, and three heat exchange spaces are formed in the reformer; reformed gas, high-temperature gas or a temperature control medium can be selectively introduced into any heat exchange space, and the reformer is more flexible in application and can be applied to different systems. A temperature control medium is introduced, and the temperature control medium can be gas or liquid from the outside or the inside of the system. By controlling the temperature of the temperature control medium, the internal heat transfer condition of the reformer is adjusted so as to meet the reforming conversion rate required by the system and assist the system in heating and cooling.

Description

Technical Field

[0001] This invention relates to the field of reformer technology, and more specifically, to a fuel reformer for SOFC. Background Technology

[0002] A solid oxide fuel cell (SOFC) is a power generation device that directly converts the chemical energy of fuel into electrical energy at high temperatures. An SOFC system typically includes an SOFC stack and auxiliary components such as a reformer and an exhaust gas burner.

[0003] Solid oxide fuel cells (SOFCs) can use high-alkane fuels such as coal gas, natural gas, and biogas. To avoid carbon buildup at the anode, these fuels require pre-reforming. Currently, steam reforming is the primary method for SOFC systems. Steam reformers, due to their high product hydrogen concentration, are the most commonly used type of reformer for achieving high-efficiency SOFC systems. Due to the strong endothermic nature of steam reforming, existing steam reformer structures include heat exchanger types and integrated reforming-combustion types. The integrated reforming-combustion structure directly absorbs heat from the combustion of the SOFC anode and cathode exhaust gases. Its high internal temperature easily leads to localized hot spots, causing catalyst deactivation and uneven temperature distribution. The heat exchanger structure, being separate from the burner, results in a slow reformer start-up time. Furthermore, the reformer is coupled with other components in the system, such as the base plate (BOP) and the fuel stack. To achieve optimal reforming conversion efficiency, the temperature or performance of other system components may exceed constraints, making thermal management of the reformer extremely difficult.

[0004] In summary, it is particularly important to provide a reformer that can control internal temperature and improve thermal efficiency. Summary of the Invention

[0005] This invention provides a fuel reformer and SOFC system for SOFC, enabling adjustment of the reforming temperature in the reformer and improving the reforming conversion rate.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows: A fuel reformer for SOFC includes, A shell having a receiving space inside, with a shell inlet and a shell outlet at each end, which are connected to the receiving space; Ventilation devices arranged at intervals are disposed within the housing space; The ventilation device includes an inner tube and an outer tube; the two ends of the inner tube are respectively connected to the inlet and outlet of the shell, and a third chamber is formed inside each inner tube for introducing a third medium. The outer tube is sleeved on the outside of each inner tube, so that a second chamber is formed between the inner tube and the outer tube for introducing a second medium; A first chamber is formed between the outer tube and the shell for introducing a first medium.

[0007] As a further improvement, the first medium, the second medium, and the third medium have different temperatures, and they exchange heat with each other; One of the first medium, the second medium, and the third medium is a temperature control medium used to adjust the temperature of the reformer.

[0008] As a further improvement, the ventilation device array is arranged in several arrays that are adapted to the shape of the shell.

[0009] As a further improvement, an interconnecting pipe is connected between adjacent outer tubes, so that the second chambers between each inner tube and outer tube are interconnected through the interconnecting pipe; Preferably, the second chamber has a conduit connecting the inlet of the second chamber and the outlet of the second chamber; preferably, the conduit passes through the housing.

[0010] As a further improvement, a first end plate and a second end plate are respectively provided at both ends of the inner tube; a plurality of through holes are opened on the first end plate and the second end plate, and each through hole corresponds to the installation of the inlet or outlet of the inner tube.

[0011] As a further improvement, the housing is connected to the housing inlet and housing outlet respectively via connecting necks; Preferably, the size of the connecting neck gradually increases from the housing inlet or housing outlet towards the interior of the housing.

[0012] As a further improvement, the first chamber is also connected to the first chamber inlet and the first chamber outlet via pipes, and the pipes for the first chamber inlet and the first chamber outlet are disposed through the housing.

[0013] As a further improvement, a catalyst is provided in the first chamber; Preferably, the catalyst is granular. When the catalyst is granular, The spacing between adjacent outer pipes must meet the following calculation formula:

[0014] The preferred outer tube diameter and shell inner diameter must satisfy the following calculation formula: 0 in, Where N is the distance between the outer tubes, and N is a positive integer greater than 1. For the number of tubes, The diameter of the catalyst, The inner diameter of the shell. This refers to the outer diameter of the tube; the unit is mm.

[0015] As a further improvement, the second chamber is provided with a plurality of fins, which are planar or wavy. Preferably, each of the fins is coated with a catalyst.

[0016] The present invention also provides an SOFC system, including the aforementioned SOFC fuel reformer.

[0017] Compared with the prior art, the technical solution provided by this invention has the following advantages: This invention discloses a fuel reformer and SOFC system for SOFCs. The reformer includes a shell, several inner tubes, and several outer tubes. A third chamber is formed inside each inner tube, a second chamber is formed between the inner and outer tubes, and a first chamber is formed between the outer tubes and the shell. Three heat exchange spaces are formed within the reformer. Reforming gas, high-temperature gas, or a temperature-controlled medium can be selectively introduced into any of these heat exchange spaces, making the reformer more flexible and applicable to different systems. By introducing a temperature-controlled medium and controlling its temperature, the heat transfer within the reformer is adjusted to meet the system's required reforming conversion rate and assist in system temperature regulation.

[0018] Furthermore, by adjusting the temperature of the temperature-controlled gas, the reforming rate can be effectively changed, thereby improving the control coupling problem caused by multiple variable inputs and outputs in SOFC systems containing reformers.

[0019] Other technical problems that can be solved by the SOFC fuel reformer of the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the reformer; Figure 2 This is a schematic diagram of the reformer's cross-section; Figure 3 This is a schematic diagram of the internal structure of the reformer; Figure 4 This is a schematic diagram of the reformer cross-section in another embodiment; Figure 5 This is a three-dimensional schematic diagram of the reformer in another embodiment.

[0021] Label Explanation: 101. First chamber inlet; 102. First chamber outlet; 201. Shell inlet; 202. Shell outlet; 301. Second chamber inlet; 302. Second chamber outlet; 401. First end plate; 402. Second end plate; 500. First chamber; 501. Shell; 502. Connecting neck; 600. Second chamber; 601. Outer tube; 700. Third chamber; 701. Inner tube; 702. Inner tube inlet; 801. Interconnecting tube; 901. Fin. Detailed Implementation

[0022] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0023] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0025] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0026] Example 1 Combination Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a fuel reformer for SOFC, including a housing 501 and a venting device.

[0027] Specifically, the housing 501 has a receiving space, and a housing inlet 201 and a housing outlet 202 are respectively provided at both ends and communicate with the receiving space. In this embodiment, the housing 501 has a circular cross-section along its radial direction, but in other embodiments, the housing 501 may be set to other shapes according to actual conditions.

[0028] Ventilation devices are arranged at intervals and housed within the accommodating space of the housing 501; each ventilation device includes an inner tube 701 and an outer tube 601. The inner tube 701 is arranged along the axial direction of the housing 501, with its two ends connected to the housing inlet 201 and the housing outlet 202, respectively. Each inner tube 701 forms a third chamber 700 for introducing a third medium. Specifically, the third medium enters through the housing inlet 201 and then flows into the third chamber 700 within each inner tube 701, before flowing out through the other end of the inner tube 701 and converging into the housing outlet 202, ultimately exiting the housing 501.

[0029] The number of outer tubes 601 and inner tubes 701 corresponds to each other. Each outer tube 601 is fitted on the outside of each inner tube 701. The inner diameter of the outer tube 601 is larger than the outer diameter of the inner tube 701. There is a gap between the outer tube 601 and the inner tube 701, so that a second chamber 600 is formed between the inner tube 701 and the outer tube 601 for introducing a second medium.

[0030] The inner tube 701 is disposed inside the shell 501, and the outer tube 601 is sleeved on the outside of the inner tube 701, so that a first chamber 500 is formed between the outer tube 601 and the shell 501 for introducing the first medium.

[0031] In this scheme, the SOFC fuel reformer is used to heat the reformed gas. The first medium, the second medium, and the third medium have different temperatures and exchange heat with each other. Moreover, at least one of the first medium, the second medium, and the third medium is a temperature control medium used to adjust the reformer temperature.

[0032] In one specific implementation, the third medium is a high-temperature gas, derived from the combustion exhaust gas of the SOFC stack or high-temperature air, typically reaching temperatures above 600°C. The first medium is a reforming gas, which can enter the first chamber 500. The third medium enters the third chamber 700, and the first medium enters the first chamber 500. The high-temperature third medium can heat the reforming gas used as the first medium, improving the reforming conversion rate. Furthermore, when the high-temperature gas of the third medium is the combustion exhaust gas from the SOFC stack, it can also improve the thermal utilization rate of the stack system.

[0033] The second medium is a temperature-controlling medium. By introducing a second medium at different temperatures into the second chamber 600, the temperature of the reformer can be adjusted, thereby controlling the temperature of the reformer to reach the optimal temperature for gas reforming and improving the reforming rate.

[0034] It should be noted that the outer tube 601 and the inner tube 701 are preferably circular tubes, which can have a larger heat exchange area and improve heat exchange efficiency. However, it is not excluded that the outer tube 601 and the inner tube 701 may have other shapes in some cases, such as square tubes.

[0035] See Figure 2 and Figure 4 As shown, the ventilation devices are arranged in an array around the center of the housing 501 to form several arrays that are adapted to the shape of the housing 501, so that a large number of ventilation devices can be installed in the space inside the housing 501.

[0036] As a further improvement, see Figure 3 As shown, a first end plate 401 and a second end plate 402 are respectively provided at both ends of the inner tube 701. Several through holes are formed on the first end plate 401 and the second end plate 402, each through hole corresponding to the inlet or outlet of the inner tube 701. (Combined with...) Figure 1 As shown, for example, one end of the inner tube 701 is an inner tube inlet 702, and each inner tube inlet 702 is connected to a through hole in the first end plate 401. The other end of the inner tube 701 is an inner tube outlet, and each inner tube outlet is connected to a through hole in the second end plate 402.

[0037] See Figure 1 As shown, the housing 501 is connected to the housing inlet 201 and the housing outlet 202 respectively via connecting necks 502. Moreover, the size of the connecting necks 502 gradually increases from the housing inlet 201 or the housing outlet 202 towards the interior of the housing 501.

[0038] Specifically, the first end plate 401 and the second end plate 402 are installed at both ends of the housing 501. The first end plate 401 and the second end plate 402 are sealed to the inside of the housing 501. The sealing connection can be achieved by installing a sealing ring or by any other existing method. The two ends of the outer tube 601 abut against the first end plate 401 and the second end plate 402 respectively, and the two ends of the outer tube 601 are also sealed to the first end plate 401 and the second end plate 402. The sealing connection can also be achieved by installing a sealing ring or by any other existing method.

[0039] Furthermore, taking the shell inlet 201 as an example, the connection neck 502 creates a diffusion-type buffer space between the shell inlet 201 and the first end plate 401. When the high-temperature gas of the third medium enters the shell inlet 201, the flow rate is relatively large. To avoid uneven radial temperature distribution within the shell 501 caused by excessive flow in the inner tube near the center and excessively low flow in the inner tube near the edge, the third medium, after entering the buffer space, first diffuses and distributes within this buffer space before entering each inner tube 701, thereby enhancing the uniformity of the radial gas distribution. Additionally, the diameter of the shell inlet 201 can be increased, for example, to 1 / 3 to 1 / 2 of the diameter of the shell 501 cylinder.

[0040] See Figure 2 As shown, an interconnecting pipe 801 connects adjacent outer pipes 601, so that the second chambers 600 between each inner pipe 701 and outer pipe 601 are interconnected through the interconnecting pipe 801. Both ends of the interconnecting pipe 801 pass through the outer pipe 601 and communicate with the second chambers 600.

[0041] Preferably, combined with Figure 1 and Figure 2 As shown, the first chamber 500 is also connected to the first chamber inlet 101 and the first chamber outlet 102 via pipelines, and the pipelines of the first chamber inlet 101 and the first chamber outlet 102 are disposed through the housing 501. The first medium enters the first chamber 500 through the first chamber inlet 101 and flows out through the first chamber outlet 102.

[0042] The second chamber 600 is also connected to the second chamber inlet 301 and the second chamber outlet 302 via pipelines, and the pipelines of the second chamber inlet 301 and the second chamber outlet 302 pass through the housing 501. The second medium enters the second chamber 600 through the second chamber inlet 301 and flows out through the second chamber outlet 302. The second chambers 600 between each inner tube 701 and outer tube 601 are interconnected by interconnecting pipes 801. The second chamber inlet 301 can be flexibly selected to be closer to or farther from the first chamber outlet 102 according to the actual situation, thereby strengthening or weakening the temperature influence on the reformer outlet.

[0043] It should be noted that the pipes of the first chamber inlet 101 and the first chamber outlet 102 need to be sealed with the housing 501, which can be achieved by installing sealing rings or applying sealant, or any existing method. One end of the pipes of the second chamber inlet 301 and the second chamber outlet 302 passes through the side wall of any outer pipe 601 and connects to the second chamber 600, and the other end passes through the housing 501. The pipes of the second chamber inlet 301 and the second chamber outlet 302 also need to be sealed with the side wall of the outer pipe 601 and the housing 501, which can be achieved by installing sealing rings or applying sealant, or any existing method.

[0044] In this embodiment, a catalyst is also provided in the first chamber 500 for introducing the first medium reforming gas. The catalyst is preferably granular. When using a granular catalyst, the diameter of the outer tube 601, the inner diameter of the shell 501, and the spacing between adjacent outer tubes 601 should be reasonably distributed according to the particle size of the catalyst to minimize gas channeling caused by uneven packing.

[0045] The catalyst can be loaded by making a through hole in the housing 501 for loading the catalyst, and then sealing it with a blind nut after loading the catalyst.

[0046] For granular catalysts, the spacing between the outer tubes 601 should allow for at least one catalyst particle to be placed, with a maximum clearance of no more than 0.5 mm. This ensures sufficient packing space for the catalyst and limits channeling of the gas (fluids preferentially choose the path of least resistance), ensuring that the catalyst can have sufficient and uniform contact with the reformed gas.

[0047] Specifically, the spacing between adjacent outer tubes 601 must meet the following calculation formula:

[0048] Where N is a positive integer greater than 1, The distance between the outer tubes. The diameter of the catalyst is shown in mm.

[0049] In addition, to further avoid channeling, the ratio of the equivalent diameter of the catalyst bed to the catalyst particle size needs to be greater than or equal to 10.

[0050] The equivalent diameter of the catalyst bed is calculated as (4 × shell-side flow area) / wetting perimeter.

[0051] Shell-side flow area = ( ²-n× ²)×π / 4 Wetting perimeter = π × +n×π×

[0052] Specifically, the diameter of the outer tube and the inner diameter of the shell must meet the following calculation formula: 0 in, For the number of tubes, The inner diameter of the shell. This refers to the outer diameter of the tube; the unit is mm.

[0053] Using particulate catalysts to form a porous structure increases the heat exchange area of ​​the reformed gas and enhances its turbulence. Therefore, the heat exchange efficiency of the reforming process can be maximized.

[0054] In this embodiment, the third medium is a high-temperature gas, which enters the reformer through the shell inlet 201, and then enters the third chamber 700 in the inner tube 701 connected to it through the through holes distributed on the first end plate 401.

[0055] The first medium is reformed gas, which enters the first chamber 500 through the first chamber inlet 101, flows inside the reformer, and flows out through the first chamber outlet 102 after reforming.

[0056] The second medium is a temperature-controlled medium that enters each second chamber 600 through the second chamber inlet 301, and can adjust the temperature of the reformer. Since both natural gas and biogas contain small amounts of high-carbon alkanes, if reforming is carried out directly inside the SOFC, carbon deposits are easily formed at the SOFC anode. Furthermore, since the reforming reaction is strongly endothermic, complete reforming inside the SOFC will lead to a large temperature gradient inside the battery, damaging it. Therefore, it is necessary to pre-reform the reforming gas to remove high-carbon components and reduce the impact of the reforming endothermic effect on the battery. In this application, when the SOFC stack is directly started using fuels such as natural gas and biogas, a higher-temperature temperature-controlled medium gas can be introduced through the second chamber inlet 301 to preheat the reformer to a certain temperature, thus initially pre-reforming the high-carbon alkanes in the fuel and preventing these more easily carbon-depositing high-carbon alkanes from directly entering the stack anode. When the SOFC system is operating normally, in order to avoid excessive local temperature, the inlet 301 of the second chamber can be vented with low-temperature gas or water (such as system exhaust gas, the temperature of which is about 50~200℃) from inside or outside the system for cooling treatment, thereby improving or optimizing the internal thermal management of the reformer and controlling the reforming temperature.

[0057] This application also provides an SOFC system, including the SOFC fuel reformer and fuel cell stack, wherein, in one case, the high-temperature gas of the third medium in the reformer may come from the combustion exhaust gas of the fuel cell stack.

[0058] Example 2 Combination Figure 4 and Figure 5 As shown, in this embodiment, a plurality of fins 901 are disposed in the second chamber 600. The fins 901 are planar, and each fin 901 is coated with a catalyst. The catalyst is coated on the surface of the fin 901. The fins 901 are installed on the outside of the inner tube 701 or on the inside of the outer tube 601.

[0059] Other structures of the reformer in this embodiment, such as the arrangement of the ventilation device and the setting of the end plate, are the same as in Embodiment 1 and will not be described again.

[0060] In this scheme, reforming gas is introduced into the second chamber 600 through the second chamber inlet 301. The fins 901 are irregularly distributed in the second chamber 600 to increase the gas disturbance and improve the reforming rate.

[0061] It should be noted that in this embodiment, the third medium is a high-temperature gas, which still enters the third chamber 700. The first medium is a temperature-controlled medium, which enters the first chamber 500 through the first chamber inlet 101. The second medium is a reformed gas, which enters each second chamber 600 through the second chamber inlet 301.

[0062] In other cases, the fins 901 are wavy, and each fin 901 is coated with a catalyst. The wavy arrangement of the fins 901 increases the surface area of ​​the fins 901, thereby further improving the reforming rate.

[0063] Of course, in this embodiment, in order to set up the fins 901, the inner diameter of the outer tube 601 can be increased, thereby increasing the space inside the second chamber 600 to accommodate the fin structure 901. Moreover, increasing the inner diameter of the outer tube 601 also increases the heat transfer area between the second chamber 600 and the first chamber 500, which facilitates the adjustment of the temperature of the reformed gas.

[0064] In this embodiment, the high-temperature gas of the third medium enters the third chamber 700, and the reformed gas of the second medium enters each second chamber 600. The high-temperature gas and the reformed gas exchange heat in adjacent spaces, which can further improve the heat transfer coefficient and enhance the heat transfer effect.

[0065] The temperature-controlling medium for the first medium enters the first chamber 500 through the first chamber inlet 101 to regulate the temperature of the reformer. Additionally, valve components such as solenoid valves can be installed on the pipeline at the first chamber inlet 101 to control the flow and interruption of the temperature-controlling medium.

[0066] It should be noted that multiple second chamber inlets 301 and second chamber outlets 302, as well as multiple first chamber inlets 101 and first chamber outlets 102, can be provided.

[0067] The terms “installation,” “setup,” “equipped with,” and “connection” used herein should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0068] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A fuel reformer for SOFCs, characterized by: The application relates to a fuel reformer for SOFCs, which comprises the following components. a shell (501) with a containing space in the shell, a shell inlet (201) and a shell outlet (202) arranged at two ends of the shell respectively and communicating with the containing space; a plurality of ventilation devices arranged at intervals in the containing space in the shell (501); the ventilation device comprises an inner tube (701) and an outer tube (601); the two ends of the inner tube (701) communicate with the shell inlet (201) and the shell outlet (202) respectively, and a third chamber (700) is formed in the inner tube (701) to pass a third medium; the outer tube (601) is arranged on the outer side of each inner tube (701) correspondingly, so that a second chamber (600) is formed between the inner tube (701) and the outer tube (601) to pass a second medium; a first chamber (500) is formed between the outer tube (601) and the shell (501) to pass a first medium.

2. The fuel reformer for SOFC according to claim 1, characterized by: The first medium, the second medium and the third medium have different temperatures and exchange heat with each other; at least one of the first medium, the second medium and the third medium is a temperature control medium for adjusting the temperature of the reformer.

3. The fuel reformer for SOFC according to claim 1, characterized by: the ventilation devices are arranged in an array to form a plurality of arrays matched with the shape of the shell (501).

4. The fuel reformer for SOFC according to claim 1, characterized by: interconnection tubes (801) are arranged between adjacent outer tubes (601) to make the second chambers (600) between each inner tube (701) and outer tube (601) communicate with each other through the interconnection tubes (801); preferably, the second chamber (600) has a pipeline connecting a second chamber inlet (301) and a second chamber outlet (302); preferably, the pipeline passes through the shell (501).

5. The fuel reformer for SOFCs according to claim 1, characterized by: first end plates (401) and second end plates (402) are arranged at the two ends of the inner tube (701); a plurality of through holes are formed in the first end plates (401) and the second end plates (402), and each through hole corresponds to the inlet or outlet of the inner tube (701).

6. The fuel reformer for SOFC according to claim 5, characterized by: the shell (501) communicates with the shell inlet (201) and the shell outlet (202) through a connecting neck (502); preferably, the size of the connecting neck (502) gradually increases from the shell inlet (201) or the shell outlet (202) to the inside of the shell (501).

7. The fuel reformer for SOFCs according to claim 1, characterized by: the first chamber (500) further communicates with a first chamber inlet (101) and a first chamber outlet (102) through pipelines respectively, and the pipelines of the first chamber inlet (101) and the first chamber outlet (102) pass through the shell (501).

8. A fuel reformer for SOFCs according to any of claims 1-7, characterised in that: a catalyst is arranged in the first chamber (500); preferably, when the catalyst is in a granular form, wherein the interval between adjacent outer tubes (601) needs to satisfy the following calculation formula: preferably, the diameter of the outer tube and the inner diameter of the shell need to satisfy the following calculation formula: 0 wherein, is the outer tube spacing, N is a positive integer greater than 1, is the number of tubes, is the diameter of the catalyst, is the shell inside diameter, is the outer tube outside diameter; in mm.

9. A fuel reformer for SOFCs according to any of claims 1-7, characterised in that: a plurality of fins (901) are arranged in the second chamber (600), and the fins (901) are in a planar or wavy shape; preferably, a catalyst is coated on each fin (901).

10. A SOFC system characterized by, the application further discloses a fuel reformer for SOFCs.

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