Integrated tubular reformer

Abstract

The utility model relates to the technical field of reformers, in particular to an integrated tubular reformer which comprises an air inlet pipe, a first air inlet and a through hole are formed in the air inlet pipe, a reforming pipe is arranged in the air inlet pipe, a catalytic device is arranged in the reforming pipe, and a second air inlet and an air outlet are formed in the reforming pipe. The first air inlet and the second air inlet are arranged close to the two ends of the air inlet pipe respectively, the air outlet is connected with an exhaust pipe, the exhaust pipe extends out of the air inlet pipe through a penetrating hole, and the pipe wall of the exhaust pipe is connected with the penetrating hole in a sealed mode. The device is compact in structure, integrates mixing, heating and cooling structures, is beneficial to prolonging the service life of a catalyst, and greatly reduces the volume of a reforming module of an SOFC (Solid Oxide Fuel Cell) system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of reformer, concretely relates to an integrated tubular reformer. BACKGROUND

[0002] The fuel reforming mode of the existing solid oxide fuel cell is mainly divided into three kinds, steam reforming, partial oxidation reforming and self-heating reforming, and the alkane reforming all needs certain reaction temperature, and the currently commonly used technology is heating the reforming fuel gas by using the heat generated by anode tail gas combustion, but this needs an additional heat exchanger, for example, the Chinese utility model patent with the authorization announcement number CN214468627U. Meanwhile, the partial oxidation reforming reaction is an exothermic reaction, and if the temperature is too high after the reaction, the noble metal catalyst can be caused to produce thermal aging, thereby reducing the service life, and in the SOFC system applied to the metal support stack, the required fuel gas temperature (about 450 DEG C) into the stack is far lower than the fuel gas temperature (about 800 DEG C) after the reforming reaction, therefore, the cooling structure needs to be equipped in the solid oxide fuel cell reforming system, which can cause the system to be large in size and complex in structure, and more connecting structures can also cause the safety problem of the increase of fuel gas leakage points. SUMMARY

[0003] The utility model discloses to the defects of prior art, provide an integrated tubular reformer, compact structure, integrated mixing, heating, cooling structure is integrated, be favorable to improving the life of catalyst, greatly reduce the volume of SOFC system reforming module.

[0004] In order to solve the above technical problems, the utility model provides an integrated tubular reformer, including the intake pipe, the intake pipe sets up first air inlet and perforation, the intake pipe is provided with the reforming pipe in, the reforming pipe is provided with catalytic device in, the reforming pipe sets up second air inlet and gas outlet, first air inlet and second air inlet are arranged respectively close to both ends of intake pipe, the gas outlet is connected with the exhaust pipe, the exhaust pipe is stretched out intake pipe through the perforation, and the pipe wall of exhaust pipe is sealedly connected with the perforation.

[0005] In some embodiments, the first air inlet is arranged at one end of the intake pipe, and the perforation is arranged on the pipe wall of the intake pipe, and the perforation is arranged close to the first air inlet.

[0006] In some embodiments, the catalytic device includes a plurality of catalytic tubes, the catalytic tubes are provided with catalysts, and the plurality of catalytic tubes are arranged along the length direction of the reforming pipe.

[0007] In some embodiments, the catalytic tube is provided with a catalyst carrier, the catalyst carrier is provided with a porous structure, and the catalyst is arranged in the porous structure.

[0008] In some embodiments, the porous structure comprises a plurality of through holes arranged axially along the catalytic tube, and the catalyst is arranged in the through holes.

[0009] In some embodiments, the number of catalysts in each of the catalytic tubes gradually increases from the second inlet to the outlet.

[0010] In some embodiments, the number of catalysts in the catalytic tube close to the outlet is greater than the number of catalysts in the catalytic tube far from the outlet.

[0011] In some embodiments, a plurality of support seats are arranged on the inner wall of the inlet pipe, and the reforming pipe is fixedly connected with the inlet pipe through the support seats.

[0012] In some embodiments, the reforming pipe and the exhaust pipe are sealingly connected through welding.

[0013] In some embodiments, the pipe wall and the perforation of the exhaust pipe are sealingly connected through glass glue.

[0014] The utility model discloses the beneficial effects are:

[0015] 1. The utility model discloses a reforming pipe is arranged in the inlet pipe, and the reforming gas (such as propane and air) enters the inlet pipe and can mix first after entering the reforming pipe from the tail end of the inlet pipe, guarantees that the reforming gas has the space of sufficient mixing, simultaneously, the heat generated in the reforming pipe can preheat the reforming gas in the inlet pipe, makes fuel gas reach the temperature required for reforming reaction, because the reforming gas has absorbed the heat in the reforming pipe, makes the temperature of catalyst reduce, is favorable for improving the service life of reformer. Therefore, the integrated pipe type reformer of the utility model integrates mixing, heating, cooling structure as a whole.

[0016] 2. The utility model discloses a perforation and first inlet close to one end of the inlet pipe are arranged, make the structure of reforming pipe simple, adopts straight pipe structure.

[0017] 3. The utility model discloses a catalyst carrier can bear catalyst and can have the function of heat exchange, through setting up the porous structure on the catalyst carrier, makes in smaller volume obtain more catalyst coating area (catalytic activation area), guarantees catalytic effect.

[0018] 4. The utility model discloses the number of catalysts in each catalytic tube and the number of catalysts in the adjacent two catalytic tubes are different, make the temperature field in the whole inlet pipe uniform and heat exchange uniform. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model;

[0020] Figure 2It is a sectional view of the utility model;

[0021] Figure 3 It is a structure schematic view of the utility model catalyst carrier.

[0022] Reference signs: air inlet pipe 1;First air inlet 101;Mixing cavity 102;Support seat 103;Sealing plate 104;Perforation 105;

[0023] Reforming pipe 2;Second air inlet 201;Air outlet 202;

[0024] Catalytic pipe 3;Porous structure 301;Catalyst carrier 302;

[0025] Exhaust pipe 4. Specific implementation

[0026] In order to make the technical problem of the present application, technical scheme and beneficial effect more clearly, the following is combined with the drawings and examples, and the present application is further described in detail.It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0027] As Figure 1 The utility model provides a kind of integrated tubular reformer, including air inlet pipe 1, air inlet pipe 1 is set with first air inlet 101 and perforation 105, air inlet pipe 1 is provided with reforming pipe 2, air inlet pipe 1 and reforming pipe 2 can be coaxially arranged, and mixing cavity 102 is formed between air inlet pipe 1 and reforming pipe 2, catalytic device is provided in reforming pipe 2, and reforming pipe 2 is set with second air inlet 201 and air outlet 202, first air inlet 101 and second air inlet 201 are respectively arranged close to the both ends of air inlet pipe 1, i.e. Figure 1 The utility model provides a kind of integrated tubular reformer, including air inlet pipe 1, air inlet pipe 1 is set with first air inlet 101 and perforation 105, air inlet pipe 1 is provided with reforming pipe 2, air inlet pipe 1 and reforming pipe 2 can be coaxially arranged, and mixing cavity 102 is formed between air inlet pipe 1 and reforming pipe 2, catalytic device is provided in reforming pipe 2, and reforming pipe 2 is set with second air inlet 201 and air outlet 202, first air inlet 101 and second air inlet 201 are respectively arranged close to the both ends of air inlet pipe 1, i.e.

[0028] It can be understood that the heat generated after the reaction of reforming gas in reforming pipe 2 is transferred to the mixing cavity 102 between air inlet pipe 1 and reforming pipe 2, and the reforming gas entering the mixing cavity 102 through the first air inlet 101 of the right end of air inlet pipe 1 can be preheated and fully mixed in the mixing cavity 102, and the preheated reforming gas enters the reforming pipe 2 through the second air inlet 201 of the left end of reforming pipe 2 for reforming, which is conducive to improving the catalytic efficiency.In addition, the reforming gas in the mixing cavity 102 absorbs the heat in the reforming pipe 2, so that the temperature of the catalytic device is reduced, the temperature of the catalyst (such as Ni) does not reach the degree of thermal aging, thereby improving the service life of the reformer, and reducing the temperature of the hydrogen-rich gas after reforming, reaching the fuel gas inlet temperature limited by the electric pile based on overtemperature.

[0029] In some embodiments, the first air inlet 101 is arranged at one end of the air inlet pipe 1, i.e. Figure 1 the right end of the air inlet pipe 1, the perforation 105 is arranged on the pipe wall of the air inlet pipe 1, the perforation 105 is arranged close to the first air inlet 101, and the left end of the air inlet pipe 1 is provided with a sealing plate 104, which can be sealingly connected to the air inlet pipe 1 by welding. At this time, the gas outlet 202 of the reforming pipe 2 is close to the right end of the air inlet pipe 1, and the reforming gas can be discharged through the L-shaped exhaust pipe 4. The reforming pipe 2 can be a thin-walled steel pipe.

[0030] In some embodiments, the catalytic device includes a plurality of catalytic pipes 3, and the catalytic pipes 3 are arranged along the length direction of the reforming pipe 2. The catalytic pipes 3 are fixed on the inner wall of the reforming pipe 2 by interference fit.

[0031] In some embodiments, as shown in Figure 2 , 3 , a catalyst carrier 302 is arranged in the catalytic pipe 3, wherein the catalyst carrier 302 can be silicon carbide, which can provide greater heat transfer efficiency while meeting the requirement of high temperature resistance, and is beneficial to heat exchange between the gas in the mixing chamber 102 and the reforming pipe 2.

[0032] The catalyst carrier 302 is provided with a porous structure 301, and the catalyst is coated in the porous structure 301, so that more catalyst coating area (catalytic activation area) is obtained in a smaller volume, which ensures the catalytic effect and is also beneficial to reducing the volume of the entire structure.

[0033] In some embodiments, as shown in Figure 2 , 3 , the porous structure 301 includes a plurality of through holes, the through holes are arranged in the axial direction of the catalytic pipe 3, and the catalyst is coated on the hole wall of the through holes.

[0034] Since the reforming gas enters the reforming pipe 2 from the second air inlet 201 at the left end of the reforming pipe 2, the reaction in the catalytic pipe 3 close to the left end of the reforming pipe 2 is more intense, and more heat is generated. The heat generated in the catalytic pipe 3 close to the first air inlet 101 is less, and the gas that can be reacted is also reduced, which will cause the temperature field inside the air inlet pipe 1 to be non-uniform, which is not conducive to the sufficient heat exchange and reaction of the reforming gas.

[0035] In some embodiments, the number of catalysts in each catalytic tube 3 gradually increases from the second gas inlet 201 to the gas outlet 202, i.e. there are fewer catalysts near the left end of the catalytic tube 3 and more catalysts near the right end of the catalytic tube 3. Further, in some embodiments, the number of catalysts in the catalytic tube 3 near the gas outlet 202 is greater than the number of catalysts in the catalytic tube 3 far from the gas outlet 202, i.e. there are fewer catalysts in the catalytic tube 3 near the left end of the reforming tube 2 and more catalysts in the catalytic tube 3 near the right end of the reforming tube 2. Through the above arrangement, the temperature field in the entire gas inlet tube 1 can be uniform and the heat exchange can be uniform. The specific number of catalysts in each catalytic tube 3 can be determined by setting temperature sensors in the catalytic tube 3 and through multiple experiments.

[0036] In some embodiments, as shown in FIG. 3, a plurality of support seats 103 are arranged on the inner wall of the gas inlet tube 1, and the reforming tube 2 is fixedly connected to the gas inlet tube 1 through the support seats 103. The reforming tube 2 can be directly welded to the support seats 103. Figure 1

[0037] In some embodiments, the reforming tube 2 and the exhaust tube 4 are sealingly connected by welding.

[0038] In some embodiments, the tube wall of the exhaust tube 4 and the perforations 105 are sealingly connected by glass glue. The glass glue needs to be high-temperature resistant glass glue.

[0039] The working principle of the integrated tubular reformer is as follows:

[0040] The reforming gas, i.e. alkanes and oxidants (such as propane and air), for participating in the reforming to produce hydrogen, first enters the mixing chamber 102 from the first gas inlet 101 and is fully mixed in the mixing chamber 102 to ensure that the reforming gas entering the reforming tube 2 is completely uniform, thereby ensuring the reforming reaction efficiency; after the reforming gas enters the reforming tube 2, since the partial oxidation reforming reaction in the catalytic tube 3 is an exothermic reaction, the heat released causes the temperature of the catalyst to rapidly rise to 800°C, at which point the catalyst needs to be cooled. The relatively cold reforming gas in the mixing chamber 102 can absorb the heat in the catalytic tube 3 based on the heat conduction of the catalyst carrier 302 and raise the temperature of the reforming gas to the reaction temperature entering the reforming tube 2. This process not only solves the problem of catalyst aging caused by excessively high temperature in the catalytic tube 3, but also solves the problem of heating the inlet gas required for the alkanes reforming reaction. Compared with the traditional structure of first mixing, then heating, and then cooling, the integrated structure greatly reduces the overall volume of the system; at the same time, fewer connection structures reduce the leakage points of the SOFC system at high temperature, and the safety of the fuel gas is greatly improved.

[0041] ​The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An integrated tubular reformer, characterized in that: The system includes an intake pipe (1), which has a first intake port (101) and a perforation (105). A reforming pipe (2) is installed inside the intake pipe (1), and a catalytic converter is installed inside the reforming pipe (2). The reforming pipe (2) has a second intake port (201) and an outlet port (202). The first intake port (101) and the second intake port (201) are respectively arranged near the two ends of the intake pipe (1). The outlet port (202) is connected to an exhaust pipe (4). The exhaust pipe (4) extends out of the intake pipe (1) through the perforation (105). The pipe wall of the exhaust pipe (4) and the perforation (105) are sealed together.

2. The integrated tubular reformer according to claim 1, characterized in that: The first air inlet (101) is located at one end of the air inlet pipe (1), and the perforation (105) is located on the pipe wall of the air inlet pipe (1). The perforation (105) is arranged close to the first air inlet (101).

3. The integrated tubular reformer according to claim 2, characterized in that: The catalytic device includes multiple catalytic tubes (3), each containing a catalyst, and the multiple catalytic tubes (3) are arranged sequentially along the length of the reforming tube (2).

4. The integrated tubular reformer according to claim 3, characterized in that: A catalyst support (302) is provided inside the catalyst tube (3), and the catalyst support (302) has a porous structure (301), and the catalyst is disposed in the porous structure (301).

5. The integrated tubular reformer according to claim 4, characterized in that: The porous structure (301) includes multiple through holes arranged axially along the catalyst tube (3), and the catalyst is disposed in the through holes.

6. The integrated tubular reformer according to any one of claims 3 to 5, characterized in that: From the second air inlet (201) to the air outlet (202), the amount of catalyst in each of the catalyst tubes (3) gradually increases.

7. The integrated tubular reformer according to any one of claims 3 to 5, characterized in that: The amount of catalyst in the catalytic tube (3) closer to the outlet (202) is greater than the amount of catalyst in the catalytic tube (3) farther away from the outlet (202).

8. The integrated tubular reformer according to any one of claims 1 to 5, characterized in that: Multiple support seats (103) are provided on the inner wall of the air intake pipe (1), and the reforming pipe (2) is fixedly connected to the air intake pipe (1) through the support seats (103).

9. The integrated tubular reformer according to any one of claims 1 to 5, characterized in that: The reformer (2) and the exhaust pipe (4) are connected by welding and sealing.

10. The integrated tubular reformer according to any one of claims 1 to 5, characterized in that: The wall of the exhaust pipe (4) and the perforation (105) are sealed together with glass glue.

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