Methanol catalytic cracking reactor

Abstract

The invention relates to the technical field of gas generation devices, in particular to a methanol catalytic cracking reactor which comprises an upper seal head, a heat exchange assembly, an isolation assembly and a lower seal head which are sequentially connected, the heat exchange assembly is provided with a heat exchange pipe, and the heat exchange pipe is communicated with the upper seal head and the isolation assembly. The isolation assembly is provided with a plurality of air guide pipes which are communicated with the upper end socket and the lower end socket respectively, the upper ends of the air guide pipes penetrate through the heat exchange pipes and extend into the upper end socket, the space between the air guide pipes and the heat exchange pipes is filled with a catalyst, the isolation assembly is communicated with an air inlet pipe, and the lower end socket is communicated with an exhaust pipe; the CO concentration can be reduced, the reaction is more complete, and loading and unloading of the catalyst and disassembly and cleaning of equipment are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of gas generating devices, and in particular to a methanol catalytic cracking reactor. Background Art

[0002] The methanol catalytic cracking reaction uses methanol and desalted water as raw materials. At 220-280°C, they are catalytically converted into a conversion gas mainly containing hydrogen and carbon dioxide on a special catalyst. The composition of the gas after cooling is as follows: H 2 73%-74%, CO 2 23%-24.5%, CO 0.5%-1%, CH 3 OH 300PPM, H 2 O saturated.

[0003] Chemical Industry Progress, Xu Jiaheng et al. recorded in "Optimization of Methanol Steam Reforming Process" that using higher temperatures in the methanol cracking stage and lower temperatures in the CO conversion stage can promote the reaction and reduce the CO concentration in the gas phase.

[0004] Therefore, the present invention proposes a methanol catalytic cracking reactor, which utilizes a two-stage process to achieve a more complete reaction and a low CO concentration in the reaction gas. Summary of the invention

[0005] Based on the above technical problems, the present invention provides a methanol catalytic cracking reactor, which utilizes a two-stage process to achieve a more complete reaction and a low CO concentration in the reaction gas.

[0006] The technical solution adopted by this application to solve this technical problem is:

[0007] A methanol catalytic cracking reactor comprises an upper head, a heat exchange component, an isolation component and a lower head which are connected in sequence;

[0008] The heat exchange assembly has a heat exchange pipe, which is respectively connected to the upper head and the isolation assembly; the isolation assembly is provided with a plurality of air ducts respectively connected to the upper head and the lower head, the upper ends of the air ducts pass through the heat exchange pipes and extend into the upper head, and a catalyst is filled between the air ducts and the heat exchange pipes; the isolation assembly is connected to an air inlet pipe, and the lower head is connected to an exhaust pipe.

[0009] In the methanol cracking stage of the present invention, the heat exchange tube and the gas guide tube both provide heat for the mixed vapor of methanol and water, while in the CO conversion stage, the mixed vapor just entering the isolation component can take away the conversion reaction heat, which is beneficial to the reaction and reduces the CO concentration in the reaction gas.

[0010] Furthermore, the distance between the outer wall of the air guide tube and the inner wall of the heat exchange tube is equal to the radius of the inner wall of the air guide tube.

[0011] When the weight of the catalysts used is similar, the above-mentioned arrangement enables the present invention to have a larger heat exchange area and high heat exchange efficiency compared to the methanol catalytic cracking reactor in the prior art. For a strongly endothermic reaction such as methanol cracking, it has better heat supply conditions, is conducive to rapid heat exchange, and promotes the methanol catalytic cracking reaction.

[0012] Furthermore, the heat exchange component also includes a shell, two end plates and multiple baffles; the space enclosed by the shell, the two end plates and the baffles is a chamber for the circulation of heat transfer oil; the upper and lower ends of the shell are respectively connected to an end plate, and a coaxially opposite connecting hole is distributed on the two end plates, and each of the heat exchange tubes is respectively connected between the coaxially opposite connecting holes; a heat transfer oil inlet pipe and a heat transfer oil outlet pipe are provided on the side wall of the shell, and a baffle is provided outside the heat exchange tube between the heat transfer oil inlet pipe and the heat transfer oil outlet pipe.

[0013] Furthermore, the isolation assembly also includes an outer cylinder and a distribution plate; the distribution plate is connected in the outer cylinder, the air guide pipe array is distributed on the distribution plate, the lower end of the air guide pipe is connected to the space below the distribution plate, the center of the distribution plate is connected to an air intake pipe, an isolation cover is provided above the air intake pipe, and the lower end of the air intake pipe passes through and extends out of the lower head.

[0014] The present invention adjusts the combination of multiple elements, multiple directions and multiple angles in the prior art into a combination of multiple elements in series. The disassembly work of the present invention can be completed by only removing the flange, and each component has a simple structure and is easy to clean.

[0015] Furthermore, the middle part of the distribution plate is low and the edges are high, and the air inlet pipe and the isolation cover are located at the center of the upper surface of the distribution plate.

[0016] The shape of the distribution plate makes the catalyst tend to concentrate in the center of the distribution plate. When the isolation cover is opened, the catalyst can be discharged from the air inlet pipe, making it easier to unload.

[0017] Furthermore, the isolation cover is a cylinder with a closed upper end and an open lower end, the lower end of the isolation cover covers the outside of the upper end of the air inlet pipe, and the lower array of the isolation cover has strip holes; a through hole is provided in the center of the distribution plate, the air inlet pipe is in sliding contact with the through hole, and the air inlet pipe is threadedly connected to the lower head. When in use, the upper end of the air inlet pipe is located in the isolation cover, and the upper end of the air inlet pipe is higher than the upper end of the strip hole. When unloading, the upper end of the air inlet pipe is lower than the upper surface of the distribution plate.

[0018] Furthermore, a connecting pipe is provided on the lower sealing head, and the lower sealing head is threadedly connected to the air inlet pipe via the connecting pipe. A sealing ring is provided on the air inlet pipe, and at least two circles of sealing grooves are provided on the upper surface of the sealing ring.

[0019] The purpose of the above-mentioned setting is to lengthen the connection length between the lower head and the air inlet pipe to prevent gas escape. The distribution plate is only in sliding contact with the air inlet pipe. However, because the gas pressure in the isolation assembly and the lower head is basically maintained at a similar state, it is not easy for the mixed vapor of methanol and the converted gas to overflow from each other.

[0020] Furthermore, a support member is provided on the outer wall of the air guide tube, and the support member is a columnar rod connected to the outer wall of the air guide tube, and the outer end of the support member contacts the inner wall of the heat exchange tube.

[0021] The support member helps to ensure that the air guide pipe and the heat exchange pipe are coaxial, and ensure that the mixed gas flows smoothly between the air guide pipe and the heat exchange pipe. At the same time, the support member also has a certain heat transfer effect, which is beneficial to heat conduction.

[0022] Furthermore, a support ring located inside the lower end of the heat exchange tube is provided on the outer wall of the air guide tube, mesh holes are evenly distributed on the support ring, and the outer edge of the support ring contacts the inner wall of the heat exchange tube.

[0023] The support ring allows the present invention to fill catalysts and ceramic balls in the isolation component according to production needs. When the isolation component is filled with catalysts, the present invention can use two catalysts, wherein one catalyst is located between the air duct and the heat exchange tube, and the other catalyst is located inside the isolation component, and the filling and unloading of the two catalysts do not interfere with each other.

[0024] Furthermore, a rod body having the same outer diameter as the air guide pipe is provided on the isolation cover, the rod body passes through the heat exchange tube at a position corresponding to the isolation cover, and a support member and a support ring are provided on the rod body.

[0025] Beneficial Effects

[0026] 1. The present invention utilizes a two-stage process to achieve a more complete reaction and a low CO concentration in the reaction gas.

[0027] 2. The present invention adopts modular parts, which are easy to disassemble and assemble, and the catalyst loading and unloading speed is faster and more efficient.

[0028] 3. Compared with the prior art, the present invention has a larger heat exchange area, higher heat utilization rate and better reaction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 is a sectional front view of the present invention;

[0031] Figure 3 is a sectional front view of the heat exchange assembly of the present invention;

[0032] Figure 4 It is a structural schematic diagram (partial cross-section) of the isolation assembly of the present invention;

[0033] Figure 5 yes Figure 2 A magnified view of part A;

[0034] Figure 6 yes Figure 2 Enlarged view of part B.

[0035] The numbers in the attached figure are: 1. upper head; 2. heat exchange component; 3. isolation component; 4. lower head; 5. exhaust pipe; 6. heat exchange tube; 7. outer tube; 8. distribution plate; 9. air guide pipe; 10. air inlet pipe; 11. isolation cover; 12. shell; 13. end plate; 14. baffle; 15. heat transfer oil inlet pipe; 16. heat transfer oil outlet pipe; 17. stop valve; 18. support member; 19. strip hole; 20. connecting pipe; 21. sealing ring, 22. support ring. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0037] Embodiment 1:

[0038] like Figure 1 and Figure 2 As shown, a methanol catalytic cracking reactor comprises an upper end cap 1, a heat exchange component 2, an isolation component 3 and a lower end cap 4. The upper end cap 1 and the heat exchange component 2, the heat exchange component 2 and the isolation component 3 are connected via flanges, and the isolation component 3 and the lower end cap 4 are fixedly connected or connected via flanges. In this embodiment, the isolation component 3 and the lower end cap 4 are connected via flanges, and an exhaust pipe 5 is obliquely connected on the lower end cap 4. The heat exchange component 2 has a heat exchange pipe 6 and a chamber for heat transfer oil circulation. The heat exchange pipe 6 connects the upper end cap 1 and the isolation component 3. Figure 4 As shown, the isolation assembly 3 includes an outer tube 7, a distribution plate 8 and an air guide pipe 9, the distribution plate 8 is connected to the lower end of the outer tube 7, and the air guide pipe 9 is arrayed on the distribution plate 8. The air guide pipe 9 is fixedly connected or threadedly connected to the distribution plate, and the lower end of the air guide pipe 9 is connected to the space below the distribution plate 8. The air guide pipe 9 is coaxially opposite to the heat exchange pipe 6 one by one, and the upper end of the air guide pipe 9 passes through the heat exchange pipe 6 and extends into the upper head 1. The outer diameter of the air guide pipe 9 is smaller than the inner diameter of the heat exchange pipe 6. The center of the distribution plate 8 is connected to an air intake pipe 10, and an isolation cover 11 is provided above the air intake pipe 10. The lower end of the air intake pipe 10 passes through and extends out of the lower head 4, and the space between the air guide pipe 9 and the heat exchange pipe 6 is filled with a catalyst.

[0039] In the methanol cracking stage of the present invention, the heat exchange tube 6 and the gas guide tube 9 both provide heat for the mixed gas flow, while in the CO conversion stage, the mixed steam just entering the isolation component can take away the heat of the conversion reaction, which is beneficial to the reaction.

[0040] The mixed vapor of methanol and water is evenly distributed in the outer cylinder, and then is heated and contacts the catalyst in the process of flowing downward from the air duct 9 and the heat exchange tube 6 to the upper head 1, and a methanol cracking reaction occurs, and there is a certain CO shift reaction at the same time. When the mixed gas flows downward from the upper head 1 along the air duct 9, the CO shift reaction is mainly a CO shift reaction. This reaction is an exothermic reaction, at least higher than the methanol cracking reaction temperature, which can heat the air duct 9, heat the catalyst and the mixed gas, and promote the methanol cracking reaction. At the same time, the strong endothermic absorption of the methanol cracking reaction can also absorb heat through the air duct 9, slow down the increase in the CO shift reaction temperature, and promote the CO shift reaction. When the mixed gas flows to the air duct 9 surrounded by the outer cylinder 7, it can also heat the mixed vapor of methanol and water that has just entered the outer cylinder 7, which on the one hand promotes the temperature rise of the mixed vapor of methanol and water, and on the other hand, it also maintains the CO shift reaction at a relatively low temperature, so that the reaction is carried out more completely, which is conducive to maintaining a low CO concentration in the reaction gas.

[0041] At the same time, the present invention adjusts the combination of multiple elements, multiple directions and multiple angles in the prior art into a combination of multiple elements in series up and down. The disassembly work of the present invention can be completed by only removing the flange, and each component is disassembled and assembled as a whole, with a simple structure and easy cleaning.

[0042] In order to achieve the above effect, Figure 3 As shown, the heat exchange component of the present invention is an integrated structure and can be disassembled and assembled as a whole. The heat exchange component 2 also includes a shell 12, two end plates 13 and a plurality of baffles 14. The space surrounded by the shell 12, the two end plates 13 and the baffles 14 is a chamber for the circulation of heat transfer oil. The upper and lower ends of the shell 12 are respectively connected to an end plate 13, and coaxially opposite connecting holes are distributed on the two end plates 13. Each of the heat exchange tubes 6 is respectively connected between coaxially opposite connecting holes. A heat transfer oil inlet pipe 15 and a heat transfer oil outlet pipe 16 are provided on the side wall of the shell 12, and a baffle 14 is provided outside the heat exchange tube 6 between the heat transfer oil inlet pipe 15 and the heat transfer oil outlet pipe 16.

[0043] The heat transfer oil inlet pipe 15 and the heat transfer oil outlet pipe 16 are both provided with stop valves 17 .

[0044] The distance between the outer wall of the air guide tube 9 and the inner wall of the heat exchange tube 6 is equal to the radius of the inner wall of the air guide tube 9 .

[0045] When the weight of the catalysts used is similar, the above-mentioned arrangement enables the present invention to have a larger heat exchange area than the methanol catalytic cracking reactor in the prior art, which is conducive to rapid heat exchange and promotes the methanol catalytic cracking reaction; the catalyst in the prior art is usually filled in the tube array, and only one cylindrical surface of the tube array wall is heat exchanged, while the present invention fills the catalyst between the heat exchange tube 6 and the air duct 9, and has two cylindrical surfaces of the heat exchange tube 6 and the air duct 9 for heat exchange, so the heat exchange area is larger than the prior art, the heat exchange efficiency is high, and for a strong endothermic reaction such as methanol cracking, it has better heat supply conditions.

[0046] like Figure 5 As shown, a support member 18 is provided on the outer wall of the air duct 9 , and the support member 18 is a columnar rod connected to the outer wall of the air duct 9 . The support member 18 is obliquely connected to the outer wall of the air duct 9 , and the outer end of the support member 18 contacts the inner wall of the heat exchange tube 6 .

[0047] The support member 18 helps to ensure that the air guide pipe 9 is coaxial with the heat exchange pipe 6, and ensures that the mixed gas flows smoothly between the air guide pipe 9 and the heat exchange pipe 6. At the same time, the support member 18 also has a certain heat transfer effect, which is beneficial to heat conduction.

[0048] The present invention only uses flange connection and can be quickly disassembled; when in use, ceramic balls are filled in the isolation component 3 to make the mixed vapor of methanol and water evenly distributed, and the catalyst is filled between the air duct 9 and the heat exchange tube 6. The mixed vapor of methanol and water enters from the air inlet pipe, and after being evenly distributed in the isolation component 3, it flows upward between the air duct 9 and the heat exchange tube 6, contacts the catalyst and is heated by the heat transfer oil and the CO conversion gas, quickly completes the methanol cracking reaction, and then is re-mixed and turned in the upper head 1, flows downward along the air duct 9, heats the catalyst in the section of the shell 12, heats the mixed vapor of methanol and water in the section of the outer cylinder 7, and then is discharged from the exhaust pipe 5 in the lower head 4.

[0049] Embodiment 2:

[0050] This embodiment is an improvement on the basis of the first embodiment, and therefore this embodiment is substantially the same as the first embodiment, and the similarities are not repeated here. The difference is that this embodiment further improves the catalyst loading and unloading operation, making the catalyst easier to unload.

[0051] In order to make the catalyst easier to unload, this embodiment has made the following improvements on the basis of the first embodiment:

[0052] like Figure 4 As shown, the distribution plate 8 is a spherical panel body with a downward depression in the center, or the distribution plate 8 is a conical cylinder with a small diameter at the lower end and a large diameter at the upper end. The air inlet pipe 10 and the isolation cover 11 are located at the center of the upper surface of the distribution plate.

[0053] The shape of the distribution plate 8 makes the catalyst more inclined to be concentrated toward the center of the distribution plate 8. When the isolation cover 11 is opened, the catalyst can be discharged from the air inlet pipe 10, making it easier to unload.

[0054] The isolation cover 11 is a cylinder with a closed upper end and an open lower end. The lower end of the isolation cover 11 covers the upper end of the air inlet pipe 10. The lower array of the isolation cover 11 has strip holes 19. The center of the distribution plate 8 is provided with a through hole. The air inlet pipe 10 is in sliding contact with the through hole. The air inlet pipe 10 is threadedly connected to the lower head 4. The upper end of the air inlet pipe 10 is located in the isolation cover 11, and the upper end of the air inlet pipe 10 is higher than the upper end of the strip hole 19.

[0055] The heat exchange tube 6 is not arranged at the position on the heat exchange component 2 corresponding to the isolation cover 11; or the heat exchange tube 6 is arranged at the position on the heat exchange component 2 corresponding to the isolation cover 11, and at the same time, a rod body with the same outer diameter as the air guide tube 9 is provided on the isolation cover 11, and the rod body passes through the heat exchange tube 6 at the position corresponding to the isolation cover 11.

[0056] A sealing ring is provided in the through hole, a connecting pipe 20 is provided on the lower head 4, an internal thread is provided on the inner wall of the connecting pipe 20, the connecting pipe 20 is threadedly connected to the intake pipe 10, a sealing ring 21 is provided on the intake pipe 10, at least two circles of sealing grooves are provided on the upper surface of the sealing ring 21, an O-ring is provided in the sealing groove, when the upper end of the intake pipe 10 is higher than the upper end of the strip hole 19, the sealing ring 21 contacts the outer wall of the lower head 4 and squeezes the O-ring to form a seal.

[0057] The purpose of the above-mentioned arrangement is to lengthen the connection length between the lower head 4 and the air inlet pipe 10 to prevent gas escape. The distribution plate 8 is only in sliding contact with the air inlet pipe 10. However, because the gas pressures in the lower head and the isolation assembly are basically maintained at a similar state, it is not easy for the mixed vapor of methanol and water to overflow with the CO conversion gas.

[0058] Embodiment three:

[0059] Based on the second embodiment of the present invention, Figure 6 As shown, a support ring 22 located inside the lower end of the heat exchange tube 6 is provided on the outer wall of the air guide tube 9 , and mesh holes are evenly distributed on the support ring 22 , and the outer edge of the support ring 22 contacts the inner wall of the heat exchange tube 6 .

[0060] In this embodiment, catalysts and ceramic balls can be filled according to production needs, or two catalysts can be directly filled, wherein one catalyst is located between the air duct and the heat exchange tube, and the other catalyst is located inside the isolation component 3, and the filling and unloading of the two catalysts do not interfere with each other, and different catalysts can be selected according to different temperatures. For example, a Cu-Zn catalyst with a relatively low applicable temperature is used in the isolation component 3, and a Cu-Cr catalyst is used between the air duct 9 and the heat exchange tube 6 to improve the reaction process and promote the completion of the conversion.

[0061] This embodiment mainly improves the loading and unloading of the catalyst, making the loading and unloading of the catalyst more convenient. When filling the catalyst, the heat exchange component 2 is not connected first, and ceramic balls or catalysts are directly added to the isolation component 3, and flattened so that there is a certain distance (usually 3-5 cm) between the upper surface of the catalyst and the upper end surface of the outer tube 7. Then, the heat exchange component 2 is connected to the isolation component 3, but the upper head 1 is not connected. The catalyst is added to the upper surface of the heat exchange component 2 (because the upper end of the air duct 9 is higher than the heat exchange component 2, the catalyst does not enter the air duct 9), and the catalyst is pushed into the space between the air duct 9 and the heat exchange tube 6 with a rake or other tool, so that the catalyst is filled from the gap between the air duct 9 and the heat exchange tube 6 to the space between the air duct 9 and the heat exchange tube 6, and finally the upper head 1 is connected.

[0062] When unloading the catalyst, it is much easier. You only need to connect the catalyst receiving device to the lower end of the intake pipe 10, and then rotate the intake pipe 10 so that the upper end of the intake pipe 10 is slightly lower than the upper surface of the distribution plate 8, and the catalyst in the isolation component 3 will naturally flow out through the strip holes 19 and the intake pipe 10. After the catalyst in the isolation component 3 flows out, open the flanges of the heat exchange component 2 and the isolation component 3, lift the heat exchange component 2 a little, and make the support ring 22 fall out of the heat exchange tube 6, then the other part of the catalyst will naturally flow out from between the air guide tube 9 and the heat exchange tube 6. This method can reduce downtime, the catalyst filling speed is fast, and the catalyst unloading does not require the catalyst to be completely cooled. You only need to rotate the intake pipe 10 to complete the unloading of most of the catalyst. At the same time, this unloading method can also unload the catalyst without opening the equipment, which can prevent high-temperature catalyst from contacting the air.

[0063] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

Claims

1. A methanol catalytic cracking reactor, characterized in that: It comprises an upper head (1), a heat exchange component (2), an isolation component (3) and a lower head (4) which are connected in sequence; The heat exchange assembly (2) comprises a heat exchange tube (6), wherein the heat exchange tube (6) is respectively connected to the upper end cap (1) and the isolation assembly (3); the isolation assembly (3) is provided with a plurality of air guide tubes (9) respectively connected to the upper end cap (1) and the lower end cap (4); the upper ends of the air guide tubes (9) pass through the heat exchange tubes (6) and extend into the upper end cap (1); a catalyst is filled between the air guide tubes (9) and the heat exchange tubes (6); the isolation assembly (3) is connected to an air inlet pipe (10), and the lower end cap (4) is connected to an exhaust pipe (5).

2. The methanol catalytic cracking reactor according to claim 1, characterized in that: The distance between the outer wall of the air guide tube (9) and the inner wall of the heat exchange tube (6) is equal to the radius of the inner wall of the air guide tube (9).

3. The methanol catalytic cracking reactor according to claim 1, characterized in that: The heat exchange assembly (2) further comprises a shell (12), two end plates (13) and a plurality of baffles (14); the space enclosed by the shell (12), the two end plates (13) and the baffles (14) is a chamber for heat transfer oil to circulate; the upper and lower ends of the shell (12) are respectively connected to an end plate (13); the two end plates (13) are provided with coaxially opposite connecting holes; each of the heat exchange tubes (6) is respectively connected between the coaxially opposite connecting holes; a heat transfer oil inlet pipe (15) and a heat transfer oil outlet pipe (16) are provided on the side wall of the shell (12); a baffle (14) is provided outside the heat exchange tube (6) between the heat transfer oil inlet pipe (15) and the heat transfer oil outlet pipe (16).

4. The methanol catalytic cracking reactor according to claim 1, characterized in that: The isolation assembly (3) further comprises an outer cylinder (7) and a distribution plate (8); the distribution plate (8) is connected inside the outer cylinder (7); the air guide pipes (9) are distributed in an array on the distribution plate (8); the lower ends of the air guide pipes (9) are connected to the space below the distribution plate (8); the center of the distribution plate (8) is connected to an air intake pipe (10); an isolation cover (11) is provided above the air intake pipe (10); and the lower end of the air intake pipe (10) passes through and extends out of the lower head (4).

5. The methanol catalytic cracking reactor according to claim 4, characterized in that: The distribution plate (8) has a low middle portion and high edges, and the air inlet pipe (10) and the isolation cover (11) are located at the center of the upper surface of the distribution plate (8).

6. The methanol catalytic cracking reactor according to claim 4, characterized in that: The isolation cover (11) is a cylindrical body with a closed upper end and an open lower end. The lower end of the isolation cover (11) covers the upper end of the air inlet pipe (10). The lower array of the isolation cover (11) has strip holes (19). A through hole is provided at the center of the distribution plate (8). The air inlet pipe (10) is in sliding contact with the through hole. The air inlet pipe (10) is threadedly connected to the lower cover (4).

7. The methanol catalytic cracking reactor according to claim 6, characterized in that: The lower end cap (4) is provided with a connecting pipe (20), and the lower end cap (4) is threadedly connected to the air intake pipe (10) via the connecting pipe (20). The air intake pipe (10) is provided with a sealing ring (21), and the upper surface of the sealing ring (21) is provided with at least two circles of sealing grooves.

8. The methanol catalytic cracking reactor according to claim 4, characterized in that: A support member (18) is provided on the outer wall of the air guide tube (9), and the support member (18) is a columnar rod connected to the outer wall of the air guide tube (9), and the outer end of the support member (18) contacts the inner wall of the heat exchange tube (6).

9. The methanol catalytic cracking reactor according to claim 8, characterized in that: A support ring (22) located inside the lower end of the heat exchange tube (6) is provided on the outer wall of the air guide tube (9), mesh holes are evenly distributed on the support ring (22), and the outer edge of the support ring (22) contacts the inner wall of the heat exchange tube (6).

10. The methanol catalytic cracking reactor according to claim 9, characterized in that: The isolation cover (11) is provided with a rod body having the same outer diameter as the air guide pipe (9), the rod body passes through the heat exchange pipe (6) at a position corresponding to the isolation cover (11), and the rod body is provided with a support member (18) and a support ring (22).

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