CN216856661U - Natural gas reforming microchannel reactor based on catalytic combustion - Google Patents
Natural gas reforming microchannel reactor based on catalytic combustion Download PDFInfo
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- CN216856661U CN216856661U CN202121423312.5U CN202121423312U CN216856661U CN 216856661 U CN216856661 U CN 216856661U CN 202121423312 U CN202121423312 U CN 202121423312U CN 216856661 U CN216856661 U CN 216856661U
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Abstract
The utility model relates to a natural gas reforming microchannel reactor based on catalytic combustion, which comprises a catalytic combustion cavity, a reforming reaction cavity and a high-temperature flue gas cavity, wherein the catalytic combustion cavity is provided with a plurality of reaction chambers; the catalytic combustion chamber is mainly composed of a first catalytic combustion flow field plate and a second catalytic combustion flow field plate which are symmetrically arranged, a fluid mixing flow guide plate is arranged at the inlet of a flow field of the catalytic combustion chamber, the flow field on the inner side of the catalytic combustion flow field plate is of a volute structure, a baffle plate is arranged in the flow field direction, exhaust holes are formed in the center positions of the first catalytic combustion flow field plate and the second catalytic combustion flow field plate, and a combustion catalyst is coated on the inner surface of the flow field. The utility model has the beneficial effects that: the reactor is integrally a middle-layer catalytic combustion cavity, the reforming reaction cavities on two sides and the high-temperature flue gas cavity are symmetrically arranged in a staggered manner to form a cylindrical laminated structure, the outermost side is provided with a housing for distributing and collecting gas, and the integration level of devices is high.
Description
Technical Field
The utility model relates to a natural gas reforming reactor, in particular to a natural gas reforming microchannel reactor based on catalytic combustion.
Background
The hydrogen is used as a green and efficient clean energy, has wide application and will occupy an important position in future energy systems in China. The natural gas resources in China are abundant, the hydrogen is prepared by reforming the natural gas and the steam at high temperature, the hydrogen production efficiency is high, and the matching with the hydrogen high-temperature application scene (such as a high-temperature fuel cell) is good. At present, natural gas reforming reactors generally adopt a natural gas direct combustion mode to supply heat required by reforming, such as a natural gas/methane reformer of Ningbo materials company and Ningbo Softner company. The mode needs a larger combustion space, which is not beneficial to the miniaturization of the device; the uneven distribution of combustion flame can cause large temperature difference on the wall surface, has high requirement on the high temperature resistance (more than 1000 ℃) of the material and influences the reforming efficiency. If the catalytic combustion mode is adopted for supplying heat, the problems can be solved, but in order to ensure the activity of the catalyst, the catalytic combustion reaction temperature is relatively low, so the flame stability is not high. In view of the above, it is desirable to provide a natural gas reforming reactor that can stabilize catalytic combustion.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a natural gas reforming microchannel reactor based on catalytic combustion.
The natural gas reforming microchannel reactor based on catalytic combustion comprises a catalytic combustion cavity, a reforming reaction cavity and a high-temperature flue gas cavity;
the catalytic combustion chamber is mainly composed of a first catalytic combustion flow field plate and a second catalytic combustion flow field plate which are symmetrically arranged, a fluid mixing flow guide plate is arranged at the inlet of a flow field of the catalytic combustion chamber, the flow field on the inner side of the catalytic combustion flow field plate is of a volute structure, a baffle plate is arranged along the flow field direction, exhaust holes are arranged at the central positions of the first catalytic combustion flow field plate and the second catalytic combustion flow field plate, and a combustion catalyst is coated on the inner surface of the flow field;
the reforming reaction cavity is formed by symmetrically arranging a first reforming microchannel plate and a second reforming microchannel plate at two sides of the catalytic combustion cavity, four air cavity partition plates vertical to circumferential tangent lines are uniformly arranged at the outer peripheries of the first reforming microchannel plate and the second reforming microchannel plate, a bluff body is arranged inside a flow field at the inner side of the reforming microchannel plate, 1/4 arc cavity walls are respectively arranged at two side surfaces in the flow direction of a fluid, vertical air holes which are not communicated with a reforming flow field are arranged at the central positions of the first reforming microchannel plate and the second reforming microchannel plate, and a reforming catalyst is coated on the inner surface of the flow field;
the high-temperature flue gas cavity is formed by arranging a first high-temperature flue gas micro-channel plate and a second high-temperature flue gas micro-channel plate on the outer side of a reforming micro-channel plate, four air cavity partition plates perpendicular to the circumferential tangent are uniformly arranged on the outer edges of the circumferences of the first high-temperature flue gas micro-channel plate and the second high-temperature flue gas micro-channel plate and correspond to the air cavity partition plates of the reforming micro-channel plate, a blunt body is arranged inside a flow field on the inner side of the warm flue gas micro-channel plate, the arrangement direction of the blunt body of the warm flue gas micro-channel plate is perpendicular to the arrangement direction of the blunt body of the reforming micro-channel plate, 1/4 arc cavity walls are respectively arranged on two side surfaces in the flow direction of a fluid, the positions of the arc cavity walls of the high-temperature flue gas micro-channel plate and the arc cavity walls of the reforming micro-channel plate are arranged in a staggered manner, and slots are formed in the diameter direction of the first high-temperature flue gas micro-channel plate and the second high-temperature flue gas distribution cavity;
an upper end cover and a lower end cover are respectively arranged on the outer sides of the first high-temperature flue gas micro-channel plate and the second high-temperature flue gas micro-channel plate, and a housing is arranged on the outer side of the lower end cover; and the upper end cover is welded with a first natural gas inlet pipe, a second natural gas inlet pipe, an air inlet pipe, a water vapor inlet pipe, a flue gas and waste gas outlet pipe and a reformed hydrogen outlet pipe.
Preferably, the method comprises the following steps: the fluid mixing guide plate adopts a plane guide plate or a spiral guide plate.
Preferably, the method comprises the following steps: the first catalytic combustion flow field plate is provided with ducts corresponding to the first natural gas inlet duct and the air inlet duct.
Preferably, the method comprises the following steps: the first catalytic combustion flow field plate and the second catalytic combustion flow field plate are provided with a pipeline corresponding to a flue gas and waste gas outlet pipe, a pipeline corresponding to a second natural gas inlet pipe and a steam inlet pipe, and a pipeline corresponding to a reformed hydrogen outlet pipe.
Preferably, the method comprises the following steps: the first catalytic combustion flow field plate and the second catalytic combustion flow field plate are correspondingly provided with separation plates to form a catalytic combustion gas mixing cavity, and the fluid mixing flow guide plate is positioned in the catalytic combustion gas mixing cavity.
Preferably, the method comprises the following steps: the chambers corresponding to the outer sides of the arc chamber walls on the two sides of the high-temperature flue gas micro-channel plate are respectively a reformed gas distribution chamber and a reformed gas collection chamber.
Preferably, the method comprises the following steps: the corresponding chambers on the outer sides of the arc chamber walls on the two sides of the reforming microchannel plate are respectively a flue gas collecting chamber A and a flue gas collecting chamber B.
Preferably, the method comprises the following steps: two holes are formed in the lower end cover below the smoke collecting cavity A and the smoke collecting cavity B, wherein the hole located below the smoke collecting cavity A corresponds to a smoke return pipe on the catalytic combustion flow field plate, and the hole located below the smoke collecting cavity B corresponds to a smoke waste gas outlet pipe.
Preferably, the method comprises the following steps: a gap is reserved between the housing and the lower end cover.
The utility model has the beneficial effects that:
1. the reactor is integrally a middle-layer catalytic combustion cavity, the reforming reaction cavities on two sides and the high-temperature flue gas cavity are symmetrically arranged in a staggered manner to form a cylindrical laminated structure, the outermost side is provided with a housing for distributing and collecting gas, and the integration level of devices is high.
2. The catalytic combustion chamber of the utility model adopts a flow field with a volute structure, the inlet of the flow field is provided with a fluid mixing guide plate, and the flow field is internally provided with a baffle plate, thereby improving the reaction efficiency and ensuring the stability of catalytic combustion.
3. The reforming reaction cavity and the high-temperature smoke cavity adopt a micro-channel flow field, a bluff body is arranged in the flow field, four air cavity separation plates are circumferentially arranged on the periphery of the flow field and used for separating different streams, and the reforming reaction cavity and the high-temperature smoke cavity are of a micro-channel structure which is arranged in a staggered and laminated mode, so that the heat exchange performance is guaranteed, and the reforming efficiency is improved.
Drawings
FIG. 1 is an exploded view of a natural gas reforming microchannel reactor based on catalytic combustion;
FIG. 2 is a structural assembly diagram of a natural gas reforming microchannel reactor based on catalytic combustion.
Description of reference numerals: the device comprises a first natural gas inlet pipe 1, an air inlet pipe 2, a second natural gas inlet pipe 3, a steam inlet pipe 4, a flue gas and waste gas outlet pipe 5, a reformed hydrogen outlet pipe 6, an upper end cover 7, a first high-temperature flue gas microchannel plate 8, a first reforming microchannel plate 9, a first catalytic combustion flow field plate 10, a second catalytic combustion flow field plate 11, a second reforming microchannel plate 12, a second high-temperature flue gas microchannel plate 13, a lower end cover 14, a housing 15, a flue gas return pipe 16, a high-temperature flue gas distribution cavity 17, a catalytic combustion gas mixing cavity 18, a reformed gas distribution cavity 19, a reformed gas collection cavity 20, a flue gas collection cavity A21 and a flue gas collection cavity B22.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the utility model. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The utility model provides a natural gas reforming microchannel reactor based on catalytic combustion, which adopts a volute structure flow field to concentrate a part with low fuel concentration at the central part of the volute so as to ensure the stability of catalytic combustion, and solves the problems of short gas retention time, low combustion efficiency, unstable combustion and the like in the catalytic combustion of natural gas in a microchannel; the high-temperature flue gas and the reforming reaction microchannel flow field are symmetrically and alternately arranged on two sides of the catalytic combustion cavity, the integration level of devices is high, the heat exchange efficiency is good, and the reforming effect can be ensured. The structure of the device comprises a catalytic combustion cavity, a reforming reaction cavity and a high-temperature smoke gas cavity.
The catalytic combustion chamber is mainly composed of a first catalytic combustion flow field plate 10 and a second catalytic combustion flow field plate 11 which are symmetrically arranged, a fluid mixing flow guide plate (both a plane flow guide plate and a spiral flow guide plate) is arranged at the inlet of a flow field of the catalytic combustion chamber, a flow field main body is of a volute structure (both a uniform-pitch volute structure and a non-uniform-pitch volute structure), baffle plates are arranged along the flow field direction, exhaust holes are formed in the center positions of the first catalytic combustion flow field plate 10 and the second catalytic combustion flow field plate 11, and a combustion catalyst is coated on the inner surface of the flow field.
The reforming reaction cavity is formed by symmetrically arranging a first reforming micro-channel plate 9 and a second reforming micro-channel plate 12 at two sides of the catalytic combustion cavity, four air cavity partition plates vertical to circumferential tangent lines are uniformly arranged at the outer peripheries of the circumferences of the first reforming micro-channel plate 9 and the second reforming micro-channel plate 12, a bluff body is arranged in the flow field to strengthen the back flow (the shape of the bluff body is not limited), 1/4 arc cavity walls are respectively arranged at two side surfaces in the flow direction of the fluid, vertical air holes which are not communicated with the reforming flow field are arranged at the central positions of the first reforming micro-channel plate 9 and the second reforming micro-channel plate 12, and reforming catalysts are coated on the inner surface of the flow field.
The high-temperature flue gas cavity is formed by arranging a first high-temperature flue gas micro-channel plate 8 and a second high-temperature flue gas micro-channel plate 13 on the outer side of a reforming micro-channel plate, four air cavity division plates vertical to circumferential tangent lines are evenly arranged on the outer peripheries of the first high-temperature flue gas micro-channel plate 8 and the second high-temperature flue gas micro-channel plate 13 and correspond to the air cavity division plates of the reforming micro-channel plate, a bluff body is arranged in a flow field to strengthen the flow returning and mixing (the shape of the bluff body is not limited), the arrangement direction of the bluff body is vertical to the arrangement direction of the bluff body of the reforming micro-channel plate, 1/4 arc cavity walls are respectively arranged on two side surfaces along the flow direction of the fluid, the arc cavity walls of the high-temperature flue gas micro-channel plate and the arc cavity walls of the reforming micro-channel plate are arranged in a staggered mode (the functions of dividing air flow and controlling the flow direction of the fluid, so that the high-temperature flue gas and the reforming gas can only flow into a gas collection cavity from respective gas distribution cavity without mixing), the first high-temperature flue gas micro-channel plate 8 and the second high-temperature flue gas micro-channel plate 13 are slotted along the diameter direction to form a high-temperature flue gas distribution cavity 17.
The reforming microchannel plate and the high-temperature flue gas microchannel plate can be symmetrically and alternately arranged in multiple layers (only two layers are shown in the figure) at two sides of the reforming reaction cavity according to needs, an upper end cover 7 and a lower end cover 14 are arranged at the outermost sides, and a housing 15 is arranged at the outer side of the lower end cover 14. And the upper end cover 7 is welded with a gas inlet and outlet pipe and comprises a first natural gas inlet pipe 1, a second natural gas inlet pipe 3, an air inlet pipe 2, a water vapor inlet pipe 4, a flue gas and waste gas outlet pipe 5 and a reformed hydrogen outlet pipe 6.
Example two
On the basis of the first embodiment, the second embodiment of the present application provides a more specific natural gas reforming microchannel reactor based on catalytic combustion, and the specific structure is as follows:
first catalytic combustion flow field plate 10 is equipped with the pipeline that corresponds first natural gas inlet pipe 1 and air inlet pipe 2, and first catalytic combustion flow field plate 10 and second catalytic combustion flow field plate 11 are equipped with the pipeline that corresponds flue gas waste gas outlet pipe 5, and first catalytic combustion flow field plate 10 and second catalytic combustion flow field plate 11 are equipped with the pipeline that corresponds second natural gas inlet pipe 3 and vapor inlet pipe 4, and first catalytic combustion flow field plate 10 and second catalytic combustion flow field plate 11 are equipped with the pipeline that corresponds reforming hydrogen outlet pipe 6. The first catalytic combustion flow field plate 10 and the second catalytic combustion flow field plate 11 are correspondingly provided with separation plates to form a catalytic combustion gas mixing cavity 18, and the fluid mixing flow guide plate is positioned in the catalytic combustion gas mixing cavity 18. The corresponding chambers at the outer sides of the arc chamber walls at the two sides of the high-temperature flue gas micro-channel plate are respectively a reformed gas distribution chamber 19 and a reformed gas collection chamber 20. The corresponding chambers on the outer sides of the arc chamber walls on the two sides of the reforming microchannel plate are respectively a flue gas collecting chamber A21 and a flue gas collecting chamber B22. Two holes are formed below the lower end cover 14 corresponding to the flue gas collecting cavity A21 and the flue gas collecting cavity B22, wherein the hole below the flue gas collecting cavity A21 corresponds to the flue gas return pipe 16 on the catalytic combustion flow field plate, and the hole below the flue gas collecting cavity B22 corresponds to the flue gas waste gas outlet pipe 5. A gap is left between the cover 15 and the lower end cap 14.
EXAMPLE III
The third embodiment of the application provides a working method of a natural gas reforming microchannel reactor based on catalytic combustion, which comprises the following steps:
s1, when the reactor works, natural gas and air respectively enter the inlet of the catalytic combustion chamber through the first natural gas inlet pipe 1 and the air inlet pipe 2, and flow into the volute structure flow field of the catalytic combustion chamber for catalytic combustion reaction after being mixed in the catalytic combustion gas mixing chamber 18;
s2, diffusing high-temperature flue gas generated by catalytic combustion reaction from an exhaust hole in the center of a catalytic combustion cavity to the upper side and the lower side to enter a high-temperature flue gas distribution cavity 17, performing gas distribution at the high-temperature flue gas distribution cavity, then flowing into a high-temperature flue gas cavity for heat exchange, and then discharging into a flue gas collection cavity A21 and a flue gas collection cavity B22, wherein the flue gas in the flue gas collection cavity A21 enters the bottom space of the housing 15 through a flue gas return pipe 16, then flows upwards to a flue gas collection cavity B22, is converged with the flue gas in the flue gas collection cavity B22, and then is discharged from a flue gas and waste gas outlet pipe 5;
s3, the natural gas and the steam used for the reforming reaction enter the reformed gas distribution cavity 19 through the second natural gas inlet pipe 3 and the steam inlet pipe 4 respectively, the gas flows into the reforming reaction cavity after being mixed and distributed at the place, the reforming reaction is carried out after the heat conducted by the high-temperature flue gas cavity and the catalytic combustion cavity is absorbed, and the generated gas is discharged from the reformed hydrogen outlet pipe 6 after being discharged into the reformed gas collection cavity 20.
The natural gas reforming reactor with the microchannel laminated structure adopts a natural gas catalytic combustion mode to supply heat required by reforming. The catalytic combustion part adopts a flow field with a volute structure, so that the contact area of fuel microelements and a catalyst is greatly increased, and the reaction efficiency is improved; meanwhile, the lower the fuel concentration is, the closer the portion is to the center of the volute, the central position heat loss is small, and stable combustion can be maintained when the fuel concentration is low. The high-temperature flue gas after catalytic combustion and reformed gas are arranged in a staggered and laminated manner through a micro-channel flow field, so that the heat exchange performance is ensured, and the reforming efficiency is improved.
Claims (9)
1. A natural gas reforming microchannel reactor based on catalytic combustion is characterized in that: comprises a catalytic combustion cavity, a reforming reaction cavity and a high-temperature smoke gas cavity;
the catalytic combustion chamber is mainly composed of a first catalytic combustion flow field plate (10) and a second catalytic combustion flow field plate (11) which are symmetrically arranged, a fluid mixing flow guide plate is arranged at the inlet of the flow field of the catalytic combustion chamber, the flow field on the inner side of the catalytic combustion flow field plate is of a volute structure, a baffle plate is arranged along the flow field direction, exhaust holes are formed in the center positions of the first catalytic combustion flow field plate (10) and the second catalytic combustion flow field plate (11), and a combustion catalyst is coated on the inner surface of the flow field;
the reforming reaction cavity is formed by symmetrically arranging a first reforming microchannel plate (9) and a second reforming microchannel plate (12) at two sides of the catalytic combustion cavity, four air cavity separation plates vertical to circumferential tangent lines are uniformly arranged at the outer peripheries of the circumferences of the first reforming microchannel plate (9) and the second reforming microchannel plate (12), a blunt body is arranged inside a flow field at the inner side of the reforming microchannel plate, 1/4 arc cavity walls are respectively arranged at two side surfaces in the flow direction of a fluid, vertical air holes which are not communicated with a reforming flow field are arranged at the central positions of the first reforming microchannel plate (9) and the second reforming microchannel plate (12), and a reforming catalyst is coated on the inner surface of the flow field;
the high-temperature flue gas cavity is formed by arranging a first high-temperature flue gas micro-channel plate (8) and a second high-temperature flue gas micro-channel plate (13) at the outer side of the reforming micro-channel plate, four air cavity partition plates vertical to the circumferential tangent are uniformly arranged at the outer edges of the circumferences of the first high-temperature flue gas micro-channel plate (8) and the second high-temperature flue gas micro-channel plate (13), the hot gas distribution cavity is arranged in the flow field of the inner side of the warm gas micro-channel plate, the arrangement direction of the blurs of the warm gas micro-channel plate is vertical to the arrangement direction of the blurs of the reforming micro-channel plate, 1/4 arc cavity walls are respectively arranged on two side surfaces in the flow direction of the fluid, the positions of the arc cavity walls of the high temperature gas micro-channel plate and the arc cavity walls of the reforming micro-channel plate are staggered, and a slot is formed in the diameter direction of the first high temperature gas micro-channel plate (8) and the second high temperature gas micro-channel plate (13) to form a high temperature gas distribution cavity (17);
an upper end cover (7) and a lower end cover (14) are respectively arranged on the outer sides of the first high-temperature flue gas micro-channel plate (8) and the second high-temperature flue gas micro-channel plate (13), and a housing (15) is arranged on the outer side of the lower end cover (14); and the upper end cover (7) is welded with the first natural gas inlet pipe (1), the second natural gas inlet pipe (3), the air inlet pipe (2), the water vapor inlet pipe (4), the flue gas and waste gas outlet pipe (5) and the reformed hydrogen outlet pipe (6).
2. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: the fluid mixing guide plate adopts a plane guide plate or a spiral guide plate.
3. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: the first catalytic combustion flow field plate (10) is provided with ducts corresponding to the first natural gas inlet duct (1) and the air inlet duct (2).
4. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: the first catalytic combustion flow field plate (10) and the second catalytic combustion flow field plate (11) are provided with a pipeline corresponding to a flue gas and waste gas outlet pipe (5), a pipeline corresponding to a second natural gas inlet pipe (3) and a steam inlet pipe (4), and a pipeline corresponding to a reformed hydrogen outlet pipe (6).
5. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: the first catalytic combustion flow field plate (10) and the second catalytic combustion flow field plate (11) are correspondingly provided with separation plates to form a catalytic combustion gas mixing cavity (18), and the fluid mixing flow plates are positioned in the catalytic combustion gas mixing cavity (18).
6. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: the corresponding chambers on the outer sides of the arc chamber walls on the two sides of the high-temperature flue gas micro-channel plate are respectively a reformed gas distribution chamber (19) and a reformed gas collection chamber (20).
7. The natural gas reforming microchannel reactor based on catalytic combustion of claim 1, wherein: the corresponding chambers on the outer sides of the arc chamber walls on the two sides of the reforming microchannel plate are respectively a flue gas collecting chamber A (21) and a flue gas collecting chamber B (22).
8. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: two holes are formed in the lower end cover (14) corresponding to the lower portions of the smoke collecting cavity A (21) and the smoke collecting cavity B (22), wherein the hole located below the smoke collecting cavity A (21) corresponds to a smoke return pipe (16) on the catalytic combustion flow field plate, and the hole located below the smoke collecting cavity B (22) corresponds to a smoke waste gas outlet pipe (5).
9. The catalytic combustion based natural gas reforming microchannel reactor of claim 1, wherein: a gap is reserved between the cover shell (15) and the lower end cover (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121423312.5U CN216856661U (en) | 2021-06-25 | 2021-06-25 | Natural gas reforming microchannel reactor based on catalytic combustion |
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| CN202121423312.5U CN216856661U (en) | 2021-06-25 | 2021-06-25 | Natural gas reforming microchannel reactor based on catalytic combustion |
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