Natural gas conversion tower

Abstract

The utility model provides a natural gas conversion tower which comprises a shell, and a heat exchange conversion section, a combustion section and a two-section conversion section are arranged in the shell. A pre-conversion channel of the heat exchange conversion section is communicated with a raw material gas inlet and a pre-conversion gas outlet; a heat exchange channel of the heat exchange conversion section is communicated with an outlet of the second conversion section and a synthesis gas outlet; the pre-conversion gas outlet is connected to the inlet end of the combustion section, and the outlet end of the combustion section is connected with the inlet end of the two-section conversion section; wherein heat exchange is carried out between the pre-conversion channel and the heat exchange channel; and the pre-conversion channel and the secondary conversion section are filled with a catalyst. The conversion tower integrates first-stage conversion and second-stage conversion, is compact in structure, reasonable in layout and capable of effectively recycling heat energy of synthesis gas, and meanwhile, the temperature of feed gas is increased through heat exchange pre-conversion, so that combustion is more sufficient, and second-stage deep conversion is more thorough.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a natural gas conversion tower. Background Technology

[0002] Traditional natural gas-to-methanol processes are mostly single-stage conversions, suitable for large-scale production facilities. When used for small-scale production, they often suffer from low conversion rates, high energy consumption, and poor economic efficiency. Furthermore, the resulting syngas has a high H / C ratio (more H than C), with residual methane content reaching approximately 5%, resulting in low methane utilization. Currently, some processes have converted the single-stage conversion to a two-stage conversion for natural gas-to-methanol production. In these two-stage conversions, the first and second stages are carried out in separate equipment. While this better adapts to small-scale production, it still suffers from high energy consumption, high equipment costs, and low conversion rates. Utility Model Content

[0003] To address the shortcomings of the existing technology, the purpose of this utility model is to provide a natural gas conversion tower that integrates primary and secondary conversion, has a compact structure and reasonable layout, and can effectively recover and utilize the heat energy of syngas. At the same time, the temperature of the raw gas is increased by heat exchange pre-conversion, resulting in more complete combustion and more thorough secondary deep conversion.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A natural gas conversion tower includes a shell, wherein a heat exchange conversion section, a combustion section and a secondary conversion section are provided inside the shell;

[0006] The pre-conversion channel of the heat exchange conversion section is connected to the feed gas inlet and the pre-converted gas outlet; the heat exchange channel of the heat exchange conversion section is connected to the outlet of the second-stage conversion section and the synthesis gas outlet.

[0007] The pre-converted gas outlet is connected to the combustion section inlet, and the combustion section outlet is connected to the second-stage conversion section inlet.

[0008] Heat exchange occurs between the pre-conversion channel and the heat exchange channel; the pre-conversion channel and the second-stage conversion section are filled with catalyst.

[0009] In one embodiment of this application, the heat exchange conversion section, the second conversion section, and the combustion section are arranged sequentially from one end to the other within the shell.

[0010] In one embodiment of this application, the heat exchange conversion section, the second conversion section, and the combustion section are arranged sequentially from top to bottom within the shell.

[0011] In one embodiment of this application, the heat exchange conversion section is provided with a first upper tube sheet, a first lower tube sheet, a first outer tube, and a first central tube;

[0012] The first upper tube sheet and the first lower tube sheet are arranged above and below each other, and their outer peripheries are sealed to the shell. The space between the first upper tube sheet and the first lower tube sheet is connected to the raw material gas inlet. The upper space of the first upper tube sheet is connected to the pre-converted gas outlet. The lower space of the first lower tube sheet is the heat exchange channel.

[0013] The first outer tube is located inside the heat exchange channel, with its lower end sealed and its upper end open and connected to the first lower tube sheet. The space inside the first outer tube is in communication with the upper space of the first lower tube sheet.

[0014] The first central tube has openings at both ends, with the lower end inserted into the first outer tube and the upper end connected to the first upper tube sheet. The interior of the first central tube is connected to the upper part of the first upper tube sheet.

[0015] The space between the inner side of the first outer tube and the outer side of the first central tube is filled with catalyst.

[0016] In one embodiment of this application, the combustion section, the second-stage conversion section, and the heat exchange conversion section are arranged sequentially from top to bottom within the shell.

[0017] In one embodiment of this application, the heat exchange conversion section is provided with a second lower tube sheet, a second upper tube sheet, a second outer tube, a second central tube, and a collecting tube;

[0018] The second lower tube sheet and the second upper tube sheet are arranged vertically and installed inside the housing. The lower space of the second lower tube sheet is connected to the raw material gas inlet. The second upper tube sheet is a perforated plate. The upper space of the second upper tube sheet is connected to the outlet end of the two-stage conversion section.

[0019] The second outer tube is coaxially arranged with the second central tube, and the space between them is filled with catalyst;

[0020] The lower end of the second outer sleeve is connected to the second lower tube sheet and communicates with the lower part of the second lower tube sheet. The upper end of the second outer sleeve is connected to the second upper tube sheet and is sealed to the outer wall of the second central tube.

[0021] The lower part of the second central tube is sealed, and the upper side wall is provided with a number of first vent holes, which are connected to the catalyst filling part and the interior of the second central tube; the upper end of the second central tube is connected to the collection tube above the second upper tube sheet, and the collection tube is connected to the pre-converted gas outlet.

[0022] In one embodiment of this application, the heat exchange conversion section is provided with a third lower tube sheet and a pre-reactor;

[0023] The third lower tube sheet is installed inside the housing, and the lower space of the third lower tube sheet is connected to the raw material gas inlet;

[0024] The prereactor has a peripheral wall cavity and an internal cavity. The peripheral wall cavity is filled with a catalyst. The upper part of the inner wall of the peripheral wall cavity is provided with a plurality of second pores, which connect the peripheral wall cavity and the internal cavity. The upper part of the internal cavity is connected to the pre-converted gas outlet.

[0025] The pre-reactor is installed on the third lower tube sheet, and the bottom of the peripheral wall cavity of the pre-reactor is connected to the lower part of the third lower tube sheet.

[0026] In one embodiment of this application, the two-stage conversion section includes a catalyst bed cover plate, a catalyst bed layer, and a catalyst bed bottom plate disposed from top to bottom within the housing, wherein the catalyst bed bottom plate is an arched bottom plate.

[0027] In one embodiment of this application, a burner is provided at the inlet end of the combustion section, and the pre-converted gas outlet is connected to the burner via a pre-converted gas pipeline.

[0028] In one embodiment of this application, the burner is further connected to a supplementary gas supply line, which is connected to both an oxygen source and a water vapor source.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] 1. The natural gas conversion tower of this application integrates primary and secondary conversion, with a compact structure and reasonable layout. It can effectively recover and utilize the heat energy of syngas. At the same time, the temperature of the raw gas is increased by heat exchange pre-conversion, resulting in more complete combustion and more thorough secondary deep conversion.

[0031] 2. In the natural gas conversion tower of this application, when the heat exchange conversion section, the secondary conversion section and the combustion section are arranged sequentially from top to bottom in the shell, the tower can operate in the direction of the flow of the high-temperature gaseous fluid to achieve low-pressure, rapid conversion and discharge, thereby making the conversion tower produce gas at a fast speed.

[0032] 3. In the natural gas conversion tower of this application, when the combustion section, the secondary conversion section and the heat exchange conversion section are arranged sequentially from top to bottom in the shell, the high-temperature gaseous fluid flows in the opposite direction. Under higher pressure, the combustion, catalytic conversion reaction and heat exchange can be carried out more fully, achieving deep conversion and improving the conversion efficiency of the conversion tower. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the natural gas conversion tower in Example 1.

[0035] Figure 2 This is a schematic diagram of the natural gas conversion tower in Example 2.

[0036] Figure 3 This is a schematic diagram of the natural gas conversion tower in Example 3.

[0037] Figure label:

[0038] 1. Shell;

[0039] 2. Heat exchange and conversion section; 21. Pre-conversion channel; 22. Heat exchange channel; 23. Raw material gas inlet; 24. Pre-converted gas outlet; 25. Syngas outlet;

[0040] 2011, First upper tube sheet; 2012, First lower tube sheet; 2013, First outer sleeve; 2014, First central tube;

[0041] 2021, Second upper tube sheet; 2022, Second lower tube sheet; 2023, Second outer sleeve; 2024, Second central tube; 2025, Collection tube; 2026, First vent;

[0042] 2031, Third lower tube sheet; 2032, Pre-reactor; 2033, Peripheral wall cavity; 2034, Internal cavity; 2035, Second vent;

[0043] 3. Combustion section; 31. Burner; 311. Pre-converted gas pipeline; 312. Supplemental gas supply pipeline;

[0044] 4. Second-stage conversion section; 41. Catalyst bed cover plate; 42. Catalyst bed layer; 43. Catalyst bed bottom plate;

[0045] 5. Catalyst. Detailed Implementation

[0046] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0047] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "top", "bottom", "inner", "outer", "outer periphery", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0052] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0053] Example 1

[0054] like Figure 1 As shown in the figure, this utility model embodiment provides a natural gas conversion tower, which includes a shell 1, which is a metal pressure shell, and a heat exchange conversion section 2, a combustion section 3 and a second conversion section 4 are arranged inside the shell 1.

[0055] The heat exchange and conversion section 2 includes a pre-conversion channel 21 and a heat exchange channel 22, which exchange heat with each other. The inlet of the pre-conversion channel 21 is connected to the feed gas inlet 23, and the outlet of the pre-conversion channel 21 is connected to the pre-converted gas outlet 24. The pre-conversion channel 21 allows the feed gas to pass through for preheating and pre-conversion. The inlet of the heat exchange channel 22 is connected to the outlet of the second-stage conversion section 4, and the outlet of the heat exchange channel 22 is connected to the syngas outlet 25. The heat exchange channel 22 allows the syngas to pass through and exchange heat with the feed gas, achieving heat recovery from the syngas and heating of the feed gas.

[0056] The pre-converted gas outlet 24 is connected to the inlet end of the combustion section 3, and the outlet end of the combustion section 3 is connected to the inlet end of the second-stage conversion section 4. The pre-converted gas after pre-conversion enters the combustion section 3 for combustion, and then enters the second-stage conversion section 4 for high-temperature conversion.

[0057] Both the pre-conversion channel 21 and the second-stage conversion section 4 are filled with catalyst 5 for catalytic conversion.

[0058] Preferably, the heat exchange conversion section 2, the secondary conversion section 4, and the combustion section 3 are arranged sequentially from one end to the other within the shell 1. This ensures that the heat exchange conversion section 2 and the secondary conversion section 4 are adjacent to each other, and the secondary conversion section 4 and the combustion section 3 are adjacent to each other. The overall structure of the conversion tower is reasonable and compact, resulting in minimal heat loss.

[0059] More preferably, the heat exchange conversion section 2, the second-stage conversion section 4 and the combustion section 3 are arranged sequentially from top to bottom within the shell 1, that is, the shell 1 is arranged vertically, with the heat exchange conversion section 2 located at the top and the combustion section 3 located at the bottom.

[0060] When the heat exchange conversion section 2, the second conversion section 4, and the combustion section 3 of the conversion tower are arranged sequentially from top to bottom inside the shell 1, they can operate in the direction of the flow of the high-temperature gaseous fluid to achieve low-pressure, rapid conversion and discharge, thus making the conversion tower produce at a fast speed.

[0061] In one implementation, such as Figure 1As shown, the heat exchange and conversion section 2 is equipped with a first upper tube sheet 2011, a first lower tube sheet 2012, a first outer sleeve 2013, and a first central tube 2014. The first upper tube sheet 2011 and the first lower tube sheet 2012 are arranged parallel to each other within the shell 1, and their outer circumferences are sealed to the inner wall of the shell 1. The space between the first upper tube sheet 2011 and the first lower tube sheet 2012 is connected to the raw material gas inlet 23. The space above the first upper tube sheet 2011 is connected to the pre-converted gas outlet 24. The space below the first lower tube sheet 2012 is a heat exchange channel 22, which is connected to the outlet of the second-stage conversion section 4 and the synthesizer outlet 25, where the synthesis gas heats the raw material gas.

[0062] The first outer tube 2013 is located inside the heat exchange channel 22. The lower end of the first outer tube 2013 is sealed and the upper end is open. The opening is inserted into the first lower tube sheet 2012. The outer side of the opening is sealed to the first lower tube sheet 2012. The interior of the first outer tube 2013 is connected to the upper space of the first lower tube sheet 2012. The raw material gas entering from the raw material gas inlet 23 can enter the first outer tube 2013 through the opening.

[0063] The first central tube 2014 is open at both ends, with the lower end inserted into the first outer tube 2013 and the upper end passing through the first upper tube plate 2011. The outer wall is sealed to the first upper tube plate 2011. The interior of the first central tube 2014 is connected to the upper part of the first upper tube plate 2011.

[0064] The space between the inner side of the first outer sleeve 2013 and the outer side of the first central tube 2014 is filled with catalyst 5, and the raw material gas undergoes pre-conversion when it flows through the catalyst section.

[0065] During operation, the raw material gas enters the pre-conversion channel 21. Specifically, the raw material gas enters the space between the first upper tube sheet 2011 and the first lower tube sheet 2012 from the raw material gas inlet 23, then enters the first outer tube 2013, passes through the catalyst 5 filling section, enters the first central tube 2014 from the bottom, and then enters the space above the first upper tube sheet 2011 from the top of the first central tube 2014, and is discharged from the pre-conversion gas outlet 24. At the same time, the syngas converted by the second-stage conversion section 4 enters the space below the first lower tube sheet 2012 (i.e., the heat exchange channel 22) to heat the first outer tube sheet 2013, and is then discharged from the shell 1 from the syngas outlet 25.

[0066] The heat exchange and conversion section 2 preheats the raw gas sufficiently, and the pre-conversion temperature is high and stable, which allows for a more complete pre-conversion.

[0067] like Figure 1As shown, the second-stage conversion section 4 is configured to include a catalyst bed cover plate 41, a catalyst bed layer 42, and a catalyst bed bottom plate 43 arranged sequentially from top to bottom within the housing 1, wherein the catalyst bed layer 42 is filled with catalyst 5. The catalyst bed cover plate 41 and the catalyst bed bottom plate 43 are permeable plates; more preferably, the catalyst bed bottom plate 43 is an upwardly arched arched bottom plate, which can effectively increase the area of ​​combustion gas entering the second-stage conversion section 4 and accelerate the combustion gas entering the second-stage conversion section 4 for high-temperature deep conversion.

[0068] Preferably, a burner 31 is provided at the inlet end of the combustion section 3, and the pre-converted gas outlet 24 is connected to the burner 31 via the pre-converted gas pipeline 311 for dispersed combustion.

[0069] Furthermore, a supplementary gas supply line 312 is provided. One end of the supplementary gas supply line 312 is connected to the burner 31, and the other end is connected to an oxygen and water vapor source to supplement the burner with a mixture of oxygen and water vapor to participate in combustion. By providing supplementary gas supply line 312 to supplement oxygen and / or water vapor, the H / C ratio can be adjusted to a more suitable ratio, resulting in a higher combustion reaction temperature, accelerated conversion reaction rate, more complete conversion, and reduced methane content in the synthesis gas, which can be reduced to below 0.5%. Simultaneously, it stabilizes combustion and makes it easier to control. When oxygen is cut off, water vapor can be used as a extinguishing agent to quickly control the burner's combustion temperature.

[0070] Example 2

[0071] This utility model embodiment provides a natural gas conversion tower, which is similar to the conversion tower in embodiment 1, except that the positions of the heat exchange conversion section 2 and the combustion section 3 are changed, and the specific structure of the heat exchange conversion section 2 is different.

[0072] Specifically, such as Figure 2 As shown, the combustion section 3, the second-stage conversion section 4, and the heat exchange conversion section 2 are arranged sequentially from top to bottom inside the shell 1, that is, the shell 1 is arranged vertically, with the combustion section 3 located at the top and the heat exchange conversion section 2 located at the bottom.

[0073] When the combustion section 3, the secondary conversion section 4, and the heat exchange conversion section 2 of the conversion tower are arranged sequentially from top to bottom within the shell 1, the high-temperature gaseous fluid flows in the opposite direction. This allows the combustion, catalytic conversion reaction, and heat exchange to proceed more fully under higher pressure, achieving deep conversion and improving the conversion efficiency of the conversion tower.

[0074] The second conversion section 4 is configured to include a catalyst bed cover plate 41, a catalyst bed layer 42, and a catalyst bed bottom plate 43 arranged sequentially from top to bottom within the shell 1, wherein the catalyst bed layer 42 is filled with catalyst 5. The catalyst bed cover plate 41 and the catalyst bed bottom plate 43 are planar permeable plates.

[0075] In one implementation, such as Figure 2 As shown, the heat exchange conversion section 2 is equipped with a second upper tube sheet 2021, a second lower tube sheet 2022, several second outer tubes 2023, several second central tubes 2024, and a collection tube 2025.

[0076] The second upper tube sheet 2021 and the second lower tube sheet 2022 are arranged parallel to each other and installed inside the housing 1. The space at the bottom of the second lower tube sheet 2022 is connected to the raw material gas inlet 23. The second upper tube sheet 2021 is a perforated plate, and the space at the top of the second upper tube sheet 2021 is connected to the outlet end of the two-stage conversion section 4. Synthetic gas can pass through the second upper tube sheet 2021 and enter the space between the second upper tube sheet 2021 and the second lower tube sheet 2022. That is, the space at the top of the second upper tube sheet 2021 and the space between the second upper tube sheet 2021 and the second lower tube sheet 2022 are heat exchange channels 22.

[0077] The second outer sleeve 2023 is coaxially arranged with the second central tube 2024, and the catalyst 5 is filled between the inner side of the second outer sleeve 2023 and the outer wall of the second central tube 2024.

[0078] The lower outer side of the second outer sleeve 2023 is sealed to the second lower tube sheet 2022, and the lower opening of the second outer sleeve 2023 communicates with the space at the lower part of the second lower tube sheet 2022; the upper end of the second outer sleeve 2023 is connected to the second upper tube sheet 2021, and the upper end of the second outer sleeve 2023 is sealed to the outer wall of the second central tube 2024.

[0079] The lower part of the second central tube 2024 is sealed, and the upper side wall is provided with a number of first vents 2026. The number of first vents 2026 connect the catalyst 5 filling part and the interior of the second central tube 2024. The collection tube 2025 is set above the second upper tube plate 2021 and below the second conversion section 4. The upper end of the second central tube 2024 is connected to the collection tube 2025, and the collection tube 2025 is then connected to the pre-converted gas outlet 24.

[0080] That is, after the raw material gas enters the space below the second lower tube sheet 2022 through the raw material gas inlet 23, it enters the catalyst 5 filling part from the bottom of the second outer tube 2023, and then enters the second central tube 2024 through the first gas hole 2026. Then it enters the collection pipe 2025 from the upper end of the second central tube 2024 and is discharged from the pre-converted gas outlet 24 (that is, the raw material gas flows through the pre-conversion channel 21). At the same time, the syngas from the second conversion section 4 enters the space above the second lower tube sheet 2022 to heat the collection pipe 2025, the second outer tube 2023 and the second lower tube sheet 2022. Then it is discharged from the shell 1 through the syngas outlet 25, realizing the preheating and pre-conversion of the raw material gas and the recovery of the syngas heat energy.

[0081] The heat exchange and conversion section 2 preheats the raw gas sufficiently, resulting in uniform, stable, and rapid pre-conversion of the raw gas.

[0082] Example 3

[0083] This utility model embodiment provides a natural gas conversion tower, which is basically the same as the conversion tower in embodiment 2, except that the specific structure of the heat exchange conversion section 2 is changed.

[0084] Specifically, such as Figure 3 As shown, the thermal conversion section 2 is equipped with a third lower tube sheet 2031 and a pre-reactor 2032.

[0085] The third lower tube sheet 2031 is installed inside the housing 1 and is sealed to the housing 1 on its outer periphery. The space at the bottom of the third lower tube sheet 2031 is connected to the raw material gas inlet 23; the synthesis gas outlet 25 is located at the top of the third lower tube sheet 2031 and close to the third lower tube sheet 2031.

[0086] The pre-reactor 2032 has a peripheral wall cavity 2033 and an internal cavity 2034. The peripheral wall cavity 2033 is filled with catalyst 5. The upper part of the inner wall of the peripheral wall cavity 2033 has several second vents 2035, which connect the peripheral wall cavity 2033 and the internal cavity 2034. The upper part of the internal cavity 2034 has an outlet pipe connected to the pre-converted gas outlet 24. The pre-reactor 2032 is mounted on a third lower tube sheet 2031, which forms the bottom seal of the internal cavity 2034. The bottom of the peripheral wall cavity 2033 of the pre-reactor 2032 is connected to the lower part of the third lower tube sheet 2031, allowing the feed gas to enter the peripheral wall cavity 2033 through this connection and come into contact with the catalyst 5 for pre-conversion. The outer wall of the peripheral wall cavity 2033 and the third lower tube sheet 2031 of the pre-reactor 2032 serve as a heat exchange interface.

[0087] During operation, the raw material gas enters the lower space of the third lower tube sheet 2031 through the raw material gas inlet 23, and then enters the catalyst 5 filling part inside the peripheral wall cavity 2033 from the bottom of the peripheral wall cavity 2033. The pre-converted gas after being catalyzed by the catalyst 5 enters the internal cavity 2034 through the second gas hole 2035, and then is discharged to the pre-converted gas outlet 24 through the outlet pipe at the top of the internal cavity 2034. At the same time, the synthesis gas discharged from the second conversion section 4 passes from top to bottom through the outer periphery of the pre-reactor 2032, and exchanges heat with the outer wall of the pre-reactor 2032 and the third lower tube sheet 2031 to heat the catalyst, raw material gas and pre-converted gas, and then is discharged from the synthesis gas outlet 25.

[0088] The heat exchange and conversion section 2 preheats the raw gas sufficiently, resulting in uniform, stable, and rapid pre-conversion of the raw gas.

Claims

1. A natural gas conversion tower, characterized in that, The system includes a shell, which contains a heat exchange and conversion section, a combustion section, and a second-stage conversion section. The pre-conversion channel of the heat exchange conversion section is connected to the feed gas inlet and the pre-converted gas outlet; the heat exchange channel of the heat exchange conversion section is connected to the outlet of the second-stage conversion section and the synthesis gas outlet. The pre-converted gas outlet is connected to the combustion section inlet, and the combustion section outlet is connected to the second-stage conversion section inlet. Heat exchange occurs between the pre-conversion channel and the heat exchange channel; the pre-conversion channel and the second-stage conversion section are filled with catalyst.

2. The natural gas conversion tower according to claim 1, characterized in that, The heat exchange conversion section, the second conversion section, and the combustion section are arranged sequentially from one end to the other within the shell.

3. The natural gas conversion tower according to claim 1 or 2, characterized in that, The heat exchange conversion section, the second conversion section, and the combustion section are arranged sequentially from top to bottom within the shell.

4. The natural gas conversion tower according to claim 3, characterized in that, The heat exchange conversion section is provided with a first upper tube sheet, a first lower tube sheet, a first outer tube, and a first central tube; The first upper tube sheet and the first lower tube sheet are arranged above and below each other, and their outer peripheries are sealed to the shell. The space between the first upper tube sheet and the first lower tube sheet is connected to the raw material gas inlet. The upper space of the first upper tube sheet is connected to the pre-converted gas outlet. The lower space of the first lower tube sheet is the heat exchange channel. The first outer tube is located inside the heat exchange channel, with its lower end sealed and its upper end open and connected to the first lower tube sheet. The space inside the first outer tube is in communication with the upper space of the first lower tube sheet. The first central tube has openings at both ends, with the lower end inserted into the first outer tube and the upper end connected to the first upper tube sheet. The interior of the first central tube is connected to the upper part of the first upper tube sheet. The space between the inner side of the first outer tube and the outer side of the first central tube is filled with catalyst.

5. The natural gas conversion tower according to claim 1 or 2, characterized in that, The combustion section, the second-stage conversion section, and the heat exchange conversion section are arranged sequentially from top to bottom within the shell.

6. The natural gas conversion tower according to claim 5, characterized in that, The heat exchange conversion section is provided with a second upper tube sheet, a second lower tube sheet, a second outer sleeve, a second central tube, and a collection tube; The second upper tube sheet and the second lower tube sheet are arranged vertically and installed inside the housing. The lower space of the second lower tube sheet is connected to the raw material gas inlet. The second upper tube sheet is a perforated plate. The upper space of the second upper tube sheet is connected to the outlet end of the two-stage conversion section. The second outer tube is coaxially arranged with the second central tube, and the space between them is filled with catalyst; The lower end of the second outer sleeve is connected to the second lower tube sheet and communicates with the lower part of the second lower tube sheet. The upper end of the second outer sleeve is connected to the second upper tube sheet and is sealed to the outer wall of the second central tube. The lower part of the second central tube is sealed, and the upper side wall is provided with a number of first vent holes, which are connected to the catalyst filling part and the interior of the second central tube; the upper end of the second central tube is connected to the collection tube above the second upper tube sheet, and the collection tube is connected to the pre-converted gas outlet.

7. The natural gas conversion tower according to claim 5, characterized in that, The heat exchange conversion section is equipped with a third lower tube sheet and a pre-reactor; The third lower tube sheet is installed inside the housing, and the lower space of the third lower tube sheet is connected to the raw material gas inlet; The prereactor has a peripheral wall cavity and an internal cavity. The peripheral wall cavity is filled with a catalyst. The upper part of the inner wall of the peripheral wall cavity is provided with a plurality of second pores, which connect the peripheral wall cavity and the internal cavity. The upper part of the internal cavity is connected to the pre-converted gas outlet. The pre-reactor is installed on the third lower tube sheet, and the bottom of the peripheral wall cavity of the pre-reactor is connected to the lower part of the third lower tube sheet.

8. The natural gas conversion tower according to claim 1, characterized in that, The two-stage conversion section includes a catalyst bed cover plate, a catalyst bed layer, and a catalyst bed bottom plate arranged from top to bottom within the shell, wherein the catalyst bed bottom plate is an arched bottom plate.

9. The natural gas conversion tower according to claim 1, characterized in that, The combustion section inlet is equipped with a burner, and the pre-converted gas outlet is connected to the burner via a pre-converted gas pipeline.

10. The natural gas conversion tower according to claim 9, characterized in that, The burner is also connected to a supplementary gas supply line, which is connected to both an oxygen source and a water vapor source.

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