Heat exchange type one-section converter

Abstract

The utility model provides a heat exchange type one-stage reformer which comprises a shell, a gas collecting box, an exhaust pipe, a plurality of reformer pipes and a guide cylinder, the guide cylinder is arranged in a second cavity and surrounds the exhaust pipe and the plurality of reformer pipes, a guide channel is formed between the outer side wall of the guide cylinder and the inner side wall of the second cavity, a plurality of first guide holes are formed in the guide cylinder, and a plurality of second guide holes are formed in the guide cylinder. The flow guide cylinder is used for guiding airflow entering from the second air inlet connector into the flow guide channel. According to the heat exchange type one-section reformer, the guide cylinder is designed to guide high-temperature airflow entering from the second air inlet connector, and the high-temperature airflow flows along the guide channel and flows into the guide cylinder from the first guide holes, so that the high-temperature airflow can flow towards the reformer pipe in the center along the gap, and the heat exchange efficiency is improved. Therefore, the problem that the temperature difference between the inner ring conversion pipe and the outer ring conversion pipe in the second cavity is too large is solved, and the conversion reaction effect of the feed gas in the conversion pipe in the inner ring area is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of conversion furnaces, in particular to a heat exchange type one-stage conversion furnace. Background Art

[0002] The heat exchange reformer is the main equipment for double-stage reforming. Its function is to absorb the heat of the high-temperature gas at the outlet of the second-stage furnace and provide the raw gas (mixed gas of natural gas and water vapor) in the reforming tube for reforming reaction with the catalyst. Since the reforming tubes are generally arranged in a ring array structure around the axis of the shell, and the high-temperature gas enters from the side of the shell, it is inevitable that the temperature of the outer ring reforming tube is significantly higher than that of the inner ring reforming tube, thereby affecting the reforming reaction effect of the raw gas in the reforming tube in the inner ring area. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide a heat exchange type single-stage reformer to solve or at least alleviate the problem of excessive temperature difference between the inner and outer ring reforming tubes, and to improve the reforming reaction effect of the raw gas in the reforming tubes in the inner ring area.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a heat exchange type one-stage reformer, comprising a shell, wherein a first chamber, a second chamber and a third chamber are sequentially arranged inside from top to bottom, the shell is provided with a first air inlet interface, a second air inlet interface and an exhaust interface, the first air inlet interface is communicated with the first chamber, and the second air inlet interface and the exhaust interface are respectively communicated with the second chamber; an air collecting box is arranged in the third chamber; an exhaust pipe is passed through the first chamber, the second chamber and the third chamber, one end of the exhaust pipe is communicated with the air collecting box, and the other end of the exhaust pipe extends upward out of the shell; a plurality of reforming tubes are passed through the second chamber and the third chamber, the two ends of the reforming tube are respectively connected with the first chamber and the air collecting box; and a guide tube is arranged in the second chamber and surrounded by the exhaust pipe and the plurality of reforming tubes, a guide channel is formed between the outer wall of the guide tube and the inner wall of the second chamber, a plurality of first guide holes are arranged on the guide tube, and the guide tube is used to guide the airflow entering the second air inlet interface into the guide channel.

[0005] Preferably, a flow guide portion is provided on a side of the flow guide tube facing the second air inlet interface, and a projection of the second air inlet interface on the flow guide tube falls into the flow guide portion.

[0006] Preferably, the guide portion is protruded outwardly toward one side of the second air inlet interface to form a first guide protrusion, and the first guide protrusion extends vertically.

[0007] Preferably, it further comprises a plurality of first guide blocks, wherein the first guide blocks are arranged on the outer side wall of the guide tube, and the first guide blocks are provided with guide surfaces, which are inclined toward the first guide holes.

[0008] Preferably, the guide tube is provided with a second guide hole, and the second guide hole is located on the side of the guide tube away from the guide part; it also includes a second guide block, the second guide block is arranged on the outer wall of the guide tube and close to the second guide hole, and the second guide protrusion is provided on the side wall of the second guide block facing the second guide hole, and the second guide protrusion extends vertically.

[0009] Preferably, the second flow guiding protrusion extends into the second flow guiding hole.

[0010] Preferably, a connecting ring is provided on the guide tube, and the connecting ring is respectively connected to the guide portion, the first guide block and the second guide block, and the outer side wall of the connecting ring is in contact with the inner side wall of the second chamber.

[0011] Preferably, it also includes a plurality of first baffles and second baffles arranged in the second chamber along a vertical interval, the first baffles and the second baffles are arranged coaxially and are respectively passed through the exhaust pipe and the plurality of conversion tubes; each second baffle is arranged between two first baffles, and the outer diameter of the second baffle is smaller than the outer diameter of the first baffle; the first baffle is provided with concentric through holes, the outer side wall of the first baffle is in contact with the inner side wall of the second chamber, and the lowest first baffle is located above the guide tube.

[0012] Beneficial effects of the utility model:

[0013] The utility model discloses a heat exchange type single-stage reforming furnace, which guides the high-temperature airflow entering from the second air inlet interface by designing a guide tube. The high-temperature airflow will flow along the guide channel and flow into the guide tube from each first guide hole, so that the high-temperature airflow will flow along the gap to the central reforming tube, thereby improving and alleviating the problem of excessive temperature difference between the inner and outer ring reforming tubes in the second chamber, and improving the reforming reaction effect of the raw gas in the reforming tube in the inner ring area. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0015] Figure 1A cross-sectional schematic diagram of a heat exchange type primary reforming furnace provided in one embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the guide tube;

[0017] Figure 3 This is a bottom view of the guide tube;

[0018] Figure 4 is a cross-sectional schematic diagram of the guide tube installed in the second chamber;

[0019] Figure 5 It is a structural schematic diagram of high temperature airflow flowing in the guide channel;

[0020] Figure 6 is a schematic diagram of the structure of the first baffle and the second baffle;

[0021] Figure 7 It is a schematic diagram of the structure of the first baffle plate cooperating with the exhaust pipe and the conversion pipe;

[0022] Figure 8 It is a schematic diagram of the structure of the second baffle plate cooperating with the exhaust pipe and the conversion pipe;

[0023] Reference numerals:

[0024] 10. Shell; 11. First chamber; 12. Second chamber; 13. Third chamber; 14. First air inlet interface; 15. Second air inlet interface; 16. Exhaust interface; 17. Support plate; 20. Air collecting box; 30. Exhaust pipe; 40. Conversion pipe; 50. Guide tube; 51. First guide hole; 52. Guide part; 521. First guide protrusion; 53. First guide block; 531. Guide surface; 54. Second guide hole; 55. Second guide block; 551. Second guide protrusion; 56. Connecting ring; 60. Guide channel; 70. First baffle plate; 71. Through hole; 80. Second baffle plate. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] like Figure 1-8As shown, in one embodiment of the utility model, a heat exchange type one-stage reformer is provided, comprising a shell 10, an air collecting box 20, an exhaust pipe 30, a plurality of reforming pipes 40 and a guide tube 50. The inside of the shell 10 is provided with a first chamber 11, a second chamber 12 and a third chamber 13 from top to bottom, and a support plate 17 is installed in the shell 10, and the support plate 17 separates the second chamber 12 and the third chamber 13. Of course, the second chamber 12 and the third chamber 13 can also be configured to be connected through the support plate 17. The shell 10 is provided with a first air inlet interface 14, a second air inlet interface 15 and an exhaust interface 16, the first air inlet interface 14 is connected to the first chamber 11, the second air inlet interface 15 and the exhaust interface 16 are respectively connected to the second chamber 12, wherein the exhaust interface 16 is located between the first air inlet interface 14 and the second air inlet interface 15.

[0032] The air collecting box 20 is arranged in the third chamber 13, the exhaust pipe 30 is arranged in the first chamber 11, the second chamber 12 and the third chamber 13, the axis of the exhaust pipe 30 coincides with the axis of the shell 10, one end of the exhaust pipe 30 is connected to the air collecting box 20, and the other end of the exhaust pipe 30 extends upward outside the shell 10. A plurality of conversion tubes 40 are arranged in the second chamber 12 and the third chamber 13, and are arranged in a circular array along the axis of the exhaust pipe 30, one end of the conversion tube 40 is connected to the first chamber 11, and the other end of the conversion tube 40 is connected to the air collecting box 20 through the pigtail tube.

[0033] The guide tube 50 is arranged in the second chamber 12 and placed on the support plate 17, and is arranged around the exhaust pipe 30 and the multiple conversion tubes 40. A guide channel 60 is formed between the outer wall of the guide tube 50 and the inner wall of the second chamber 12. The guide tube 50 is provided with a plurality of first guide holes 51. The guide tube 50 is used to guide the airflow entering the second air inlet interface 15 into the guide channel 60.

[0034] The raw gas enters the first chamber 11 from the first air inlet port 14 and is evenly distributed to the conversion tube 40 containing the catalyst. At the same time, the high-temperature gas of the second-stage furnace enters the second chamber 12 from the second air inlet port 15. The conversion tube 40 absorbs the heat provided by the high-temperature gas. The raw gas undergoes a conversion reaction under the action of the catalyst in the conversion tube 40, and is collected in the gas collecting box 20 through the pigtail pipe at the bottom of the conversion tube 40, and then discharged upward from the shell 10 through the exhaust pipe 30 to enter the second-stage furnace for further conversion reaction.

[0035] After the high-temperature airflow enters the second chamber 12 from the second air inlet interface 15, it will be blocked by the guide tube 50, and thus flow along the guide channel 60. Part of the high-temperature airflow will enter the guide tube 50 from each first guide hole 51, thereby performing heat exchange with the conversion tube 40, which helps the raw gas to perform conversion reaction in the conversion tube 40. Part of the high-temperature airflow will flow upward along the second chamber 12, thereby fully performing heat exchange with the conversion tube 40.

[0036] To sum up, the present embodiment discloses a heat exchange type single-stage converter, which guides the high-temperature airflow entering from the second air inlet interface 15 by designing a guide tube 50. The high-temperature airflow will flow along the guide channel 60 and flow into the guide tube 50 from each first guide hole 51. This will help the high-temperature airflow to flow along the gap toward the central conversion tube 40, thereby improving and alleviating the problem of excessive temperature difference between the inner and outer ring conversion tubes 40 in the second chamber 12, and improving the conversion reaction effect of the raw gas in the conversion tube 40 in the inner ring area.

[0037] In one embodiment, a guide portion 52 is provided on one side of the guide tube 50 facing the second air inlet interface 15, and the projection of the second air inlet interface 15 on the guide tube 50 completely falls into the guide portion 52. The guide portion 52 protrudes outward toward one side of the second air inlet interface 15 to form a first guide protrusion 521, and the first guide protrusion 521 extends vertically. The high-temperature airflow entering from the second air inlet interface 15 will flow directly into the guide portion 52, and under the action of the first guide protrusion 521 of the guide portion 52, part of the high-temperature airflow will flow into the guide channel 60 from both sides of the first guide protrusion 521. The high-temperature airflow entering the guide channel 60 will flow into the interior of the guide tube 50 from each first guide hole 51, thereby performing heat exchange with the conversion tubes 40 of the outer and inner circles, and then the high-temperature airflow will flow upward again and finally be discharged from the exhaust interface 16.

[0038] In one embodiment, the guide tube 50 further includes a plurality of first guide blocks 53, which are disposed on the outer wall of the guide tube 50, and are provided with guide surfaces 531, which are inclined toward the first guide holes 51. The high-temperature airflow entering the guide channel 60 will flow more smoothly toward the first guide holes 51 under the action of the guide surfaces 531 of the first guide blocks 53, which helps the high-temperature airflow to quickly enter the interior of the guide tube 50.

[0039] In one embodiment, the guide tube 50 is provided with a second guide hole 54, and the second guide hole 54 is located on a side of the guide tube 50 away from the guide portion 52. The guide tube 50 further includes a second guide block 55, which is provided on the outer side wall of the guide tube 50 and close to the second guide hole 54. The side wall of the second guide block 55 facing the second guide hole 54 is provided with a second guide protrusion 551, and the second guide protrusion 551 extends vertically.

[0040] After flowing in the guide channel 60, part of the high-temperature airflow will flow to the end of the guide channel 60 away from the second air inlet interface 15, and the high-temperature airflow in the guide channel 60 on both sides of the second guide block 55 will be guided to the second guide hole 54 under the action of the second guide protrusion 551. By designing the second guide block 55 and the second guide protrusion 551, the mutual influence of the high-temperature airflow on both sides of the second guide block 55 is reduced, so that the high-temperature airflow can flow smoothly to the second guide hole 54.

[0041] In one embodiment, in order to further improve the flow guiding effect, the second flow guiding protrusion 551 extends into the second flow guiding hole 54 .

[0042] In one embodiment, a connecting ring 56 is provided on the guide tube 50, and the connecting ring 56 is respectively connected to the guide portion 52, the first guide block 53 and the second guide block 55, and the outer wall of the connecting ring 56 is in contact with the inner wall of the second chamber 12. The design of the connecting ring 56 can not only realize the connection between the guide tube 50 and the guide portion 52, the first guide block 53 and the second guide block 55. At the same time, under the shielding of the connecting ring 56, the high-temperature airflow entering from the second air inlet interface 15 can only flow to the guide channel 60, so this improves the guide effect of the guide tube 50.

[0043] In one embodiment, the heat exchange type primary reformer further comprises a plurality of first baffles 70 and second baffles 80 arranged vertically and spaced apart in the second chamber 12, the first baffles 70 and the second baffles 80 are arranged coaxially and respectively penetrate the exhaust pipe 30 and the plurality of reforming tubes 40. Each second baffle 80 is arranged between two first baffles 70, and the outer diameter of the second baffle 80 is smaller than the outer diameter of the first baffle 70. The first baffle 70 is provided with a concentric through hole 71, the outer side wall of the first baffle 70 is in contact with the inner side wall of the second chamber 12, and the lowest first baffle 70 is located above the guide tube 50.

[0044] During the upward flow of the high-temperature airflow, it will be blocked by the first baffle 70, and the high-temperature airflow can only flow upward through the through hole 71. Subsequently, it will be blocked by the second baffle 80 and can only flow upward through the gap between the second baffle 80 and the inner wall of the second chamber 12. The design of the first baffle 70 and the second baffle 80 not only extends the flow path of the high-temperature airflow in the second chamber 12, but also increases the flow speed of the high-temperature airflow between the conversion tubes 40, thereby improving the heat transfer effect.

[0045] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A heat exchange type one-stage reforming furnace, characterized in that: include: A shell (10), wherein a first chamber (11), a second chamber (12) and a third chamber (13) are sequentially arranged inside the shell (10) from top to bottom; a first air inlet interface (14), a second air inlet interface (15) and an air exhaust interface (16) are arranged on the shell (10); the first air inlet interface (14) is communicated with the first chamber (11), and the second air inlet interface (15) and the air exhaust interface (16) are respectively communicated with the second chamber (12); An air collecting box (20) is arranged in the third chamber (13); an exhaust pipe (30) passing through the first chamber (11), the second chamber (12) and the third chamber (13); one end of the exhaust pipe (30) is connected to the air collecting box (20), and the other end of the exhaust pipe (30) extends upward out of the shell (10); A plurality of conversion tubes (40) are arranged in the second chamber (12) and the third chamber (13), and two ends of the conversion tubes (40) are respectively connected to the first chamber (11) and the gas collecting box (20); as well as A guide tube (50) is arranged in the second chamber (12) and is arranged around the exhaust pipe (30) and the plurality of conversion tubes (40). A guide channel (60) is formed between the outer wall of the guide tube (50) and the inner wall of the second chamber (12). The guide tube (50) is provided with a plurality of first guide holes (51). The guide tube (50) is used to guide the airflow entering from the second air inlet interface (15) into the guide channel (60).

2. The heat exchange type primary reformer according to claim 1, characterized in that: A flow guide portion (52) is provided on a side of the flow guide tube (50) facing the second air inlet interface (15), and a projection of the second air inlet interface (15) on the flow guide tube (50) falls into the flow guide portion (52).

3. The heat exchange type primary reformer according to claim 2, characterized in that: The guide portion (52) is formed with a first guide protrusion (521) protruding outwardly toward one side of the second air inlet interface (15), and the first guide protrusion (521) extends vertically.

4. The heat exchange type primary reformer according to claim 2 or 3, characterized in that: It also includes a plurality of first guide blocks (53), wherein the first guide blocks (53) are arranged on the outer side wall of the guide tube (50), and the first guide blocks (53) are provided with a guide surface (531), and the guide surface (531) is inclined toward the first guide hole (51).

5. The heat exchange type primary reformer according to claim 4, characterized in that: The guide tube (50) is provided with a second guide hole (54), and the second guide hole (54) is located on a side of the guide tube (50) away from the guide portion (52); The invention also comprises a second guide block (55), wherein the second guide block (55) is arranged on the outer wall of the guide tube (50) and is close to the second guide hole (54), and a second guide protrusion (551) is arranged on the side wall of the second guide block (55) facing the second guide hole (54), and the second guide protrusion (551) extends vertically.

6. The heat exchange type primary reformer according to claim 5, characterized in that: The second flow guiding protrusion (551) extends into the second flow guiding hole (54).

7. The heat exchange type primary reformer according to claim 5, characterized in that: The guide tube (50) is provided with a connecting ring (56), and the connecting ring (56) is respectively connected to the guide portion (52), the first guide block (53) and the second guide block (55), and the outer side wall of the connecting ring (56) is in contact with the inner side wall of the second chamber (12).

8. The heat exchange type primary reformer according to claim 1, characterized in that: It also includes a plurality of first baffles (70) and second baffles (80) vertically spaced apart and arranged in the second chamber (12); the first baffles (70) and the second baffles (80) are coaxially arranged and respectively penetrate the exhaust pipe (30) and the plurality of conversion pipes (40); Each of the second baffles (80) is arranged between two of the first baffles (70), and the outer diameter of the second baffle (80) is smaller than the outer diameter of the first baffle (70); the first baffle (70) is provided with a concentric through hole (71), the outer wall of the first baffle (70) is in contact with the inner wall of the second chamber (12), and the lowest first baffle (70) is located above the guide tube (50).

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