Radial thermal cracking reactor

Abstract

The utility model discloses a radial thermal cracking reactor, it includes reactor shell and sets up in the gas outlet pipe, manifold, gas distribution cylinder, first tube plate, second tube plate, gas inlet pipe, a plurality of heat exchange pipes and a plurality of heating elements in reactor shell, be provided with first connecting hole and second connecting hole on first tube plate, be provided with third connecting hole on second tube plate, and the gas outlet pipe, manifold, gas distribution cylinder are coaxial from center to outside along the radial direction of reactor shell and set gradually. The radial thermal cracking reactor of the utility model is low in energy consumption, and the heat loss of high temperature area section is reduced through the heat exchanger, and the temperature of the import gas of cracking catalyst bed layer is improved. Through setting up the heating element in the space of filling catalyst, the cracking reaction temperature of any one area of catalyst bed layer reaches or is higher than the catalyst activation temperature, so that the catalyst in the reactor is fully utilized.

Description

Technical Field

[0001] This utility model relates to a radial thermal pyrolysis reactor. Background Technology

[0002] In current domestic and international pyrolysis reactors and ammonia cracking hydrogen production process units, ammonia cracking hydrogen production reactors are mostly tubular reactors. The steel pipes (or furnace chambers) of the tubular reactor are filled with ammonia cracking catalyst and sealed. Gas inlet and outlet ports are opened at both ends of the steel pipes containing the ammonia cracking catalyst. Since ammonia cracking is an endothermic reaction, a steel pipe containing the cracking reactor is placed in a tank. Several electric heaters are installed inside the tank, using external electric heating for the catalytic cracking reaction, supplying heat to the ammonia cracking reaction inside the pipe through heat conduction and radiation. This type of cracking reactor has a large temperature difference between the inlet gas and the activation temperature of the cracking reaction, resulting in high operating power of the electric heaters and high power consumption.

[0003] Furthermore, this type of tubular cracking reactor requires catalyst loading section by section, which is time-consuming and labor-intensive. When the cracking catalyst reaches the end of its service life, the spent catalyst can only be unloaded by cutting open the tubes. The destructive nature of the cut tubes makes them difficult to reuse, requiring the reactor to be replaced entirely. Due to the inherent shape and characteristics of the tubular reactor, the maximum ammonia cracking production capacity of a single unit can only reach 160 kg / h, making it unsuitable for large-scale production. Utility Model Content

[0004] The purpose of this invention is to solve the problems of high energy consumption, non-reusability, and inability to conduct large-scale production in existing ammonia cracking hydrogen production reactors, and to provide a radial thermal cracking reactor. This invention features a simple thermal cracking reaction structure, high heat transfer efficiency, high thermal energy utilization, and stable and controllable reaction temperature, allowing for full utilization of the catalyst within the reactor.

[0005] This utility model solves the above-mentioned technical problems through the following technical solutions:

[0006] This utility model provides a radial pyrolysis reactor, which includes a reactor shell and a gas outlet pipe, a collector pipe, a gas distribution cylinder, a first tube sheet, a second tube sheet, a gas inlet pipe, a plurality of heat exchange tubes and a plurality of heating elements disposed within the reactor shell.

[0007] The first tube sheet is provided with a first connecting hole and a second connecting hole; the second tube sheet is provided with a third connecting hole;

[0008] The gas outlet pipe, the manifold, and the gas distribution cylinder are coaxially arranged from the center outwards along the radial direction of the reactor shell; the heat exchange tubes are arranged side by side inside the gas outlet pipe, and a space is formed between the heat exchange tubes and the gas outlet pipe; a first annular space is formed between the gas outlet pipe and the manifold; the tops of the gas distribution cylinder and the manifold are both connected to the first tube sheet, and the inner wall of the gas distribution cylinder, the outer wall of the manifold, the bottom wall of the first tube sheet, and the bottom wall of the reactor shell enclose a second annular space for loading the catalyst; a third annular space is provided between the outer wall of the gas distribution cylinder and the inner wall of the reactor shell; a first through hole and a second through hole are respectively provided on the manifold and the gas distribution cylinder, the first through hole connecting the first annular space and the second annular space, and the second through hole connecting the second annular space and the third annular space;

[0009] A gas buffer chamber is provided between the first tube sheet and the top wall of the reactor shell, and the gas buffer chamber is in communication with the third annular space; a gap for gas flow is provided between one end of the gas outlet pipe and the bottom wall of the first tube sheet, and the other end of the gas outlet pipe is located at the bottom of the reactor shell; the top of the heat exchange tube is sealed to the first connection hole of the first tube sheet, and the heat exchange tube is in communication with the gas buffer chamber, and the bottom of the heat exchange tube is sealed to the third connection hole of the second tube sheet;

[0010] One end of the gas inlet pipe is connected to the second tube sheet and communicates with the bottom of the heat exchange tube. The other end of the gas inlet pipe is located at the bottom of the reactor shell. A fourth annular space is formed between the gas inlet pipe and the gas outlet pipe. The fourth annular space is sequentially connected to the interlayer space, the gap, and the first annular space.

[0011] A plurality of the heating elements are disposed in the second annular space, and the heating elements are sealed to the second connection hole of the first tube sheet.

[0012] The radial thermal cracking reactor of this invention has low energy consumption. By installing a heat exchanger in the gas outlet pipe, heat loss in the high-temperature zone is reduced, and the temperature and quality of the gas entering the cracking catalyst bed are improved. By installing a heating element in the second annular space where the catalyst is packed, the cracking reaction temperature in any region of the catalyst bed reaches or exceeds the catalyst activation temperature, so that the catalyst in the reactor is fully utilized and the conversion rate of ammonia cracking is improved. By combining the built-in heat exchanger with the external heating element, the conversion rate of ammonia cracking is improved while reducing energy consumption.

[0013] In a preferred embodiment of the present invention, a discharge port is provided at the bottom of the reactor shell. The discharge port is located around the gas outlet pipe and is symmetrically arranged with the gas outlet pipe as the center, so as to realize the complete self-discharge of the catalyst.

[0014] In a preferred embodiment of this invention, both the first through hole and the second through hole are arranged radially along the reactor shell, so that the reaction gas enters the catalyst bed radially and improves the reaction uniformity.

[0015] In a preferred embodiment of this utility model, a plurality of heating elements are arranged in concentric circles with the manifold as the center, and the projections of two adjacent rings of heating elements on the same circumferential surface are arranged sequentially and evenly at intervals along the circumference of the circumferential surface to improve the uniformity of heating.

[0016] In a preferred embodiment of this utility model, the heating element includes a heating wire and a protective tube. The heating wire is disposed inside the protective tube to prevent the heating wire of the second heating element from being worn or damaged due to direct contact with the catalyst.

[0017] Furthermore, the heating element may also be connected to a terminal block, one end of which is connected to the heating wire, and the other end of which is connected to the top of the reactor shell.

[0018] In a preferred embodiment of this invention, a support frame is further provided in the second annular space. The support frame is fixed to the manifold, and the heating element is connected to the support frame, supporting the heating element in the annular space while reducing the impact on the catalyst bed. The support frame may be a steel frame.

[0019] In a preferred embodiment of this invention, the gas inlet pipe includes a first gas inlet pipe section and a second gas inlet pipe section. The first gas inlet pipe section is an arc-shaped pipe with a gradually decreasing diameter, and the arc surface of the arc-shaped pipe convexes outward. The larger diameter end of the first gas inlet pipe section is connected to the second tube sheet, and the smaller diameter end of the first gas inlet pipe section has the same diameter as the second gas inlet pipe section. The second gas inlet pipe section is a pipe of equal diameter. In this preferred embodiment, a buffer space can be formed inside the arc-shaped pipe, and the gas entering from the second gas inlet pipe section gathers in this buffer space, allowing the gas to enter the heat exchange tube more evenly.

[0020] In a preferred embodiment of this utility model, the gas outlet pipe includes a first gas outlet pipe section, a second gas outlet pipe section, and a third gas outlet pipe section connected in sequence; the diameter of the first gas outlet pipe section is larger than that of the third gas outlet pipe section, and both the first and third gas outlet pipe sections are equal-diameter pipes; the second gas outlet pipe section is an arc-shaped pipe with a gradually decreasing diameter from the first gas outlet pipe section to the third gas outlet pipe section, and the arc surface of the arc-shaped pipe convexes outward; the heat exchange tube is disposed in the first gas outlet pipe section; and the second and third gas outlet pipe sections form a fourth annular space with the gas inlet pipe. This preferred embodiment of the gas outlet pipe improves the gas collection effect.

[0021] In a preferred embodiment of this utility model, an annular end plate is provided at the bottom of the second annular space. The outer side wall of the annular end plate is connected to the collecting pipe, and the inner side wall of the annular end plate is connected to the gas outlet pipe. This is used to seal the bottom of the second annular space, so that all the gas after the reaction in the catalyst bed enters the collecting pipe through the second through hole on the side wall of the collecting pipe, thereby improving the reaction uniformity and making the catalyst in the reactor more fully utilized.

[0022] In a preferred embodiment of this utility model, the bottom of the gas distribution cylinder is connected to the bottom inner wall of the reactor shell, so that the first annular space is an open space at the top and closed space at the bottom, so that all the gas enters the catalyst bed through the second through hole, thereby improving the reaction uniformity.

[0023] In a preferred embodiment of the present invention, the radial pyrolysis reactor further includes a heat insulation layer disposed on the inner wall of the reactor shell for heat preservation and to reduce heat loss.

[0024] In a preferred embodiment of this utility model, the reactor shell includes a cylindrical body, a lower end cap, and a cover plate. The lower end cap and the cover plate are respectively connected to both ends of the cylindrical body. The cover plate is connected to the cylindrical body via a flange. The lower end cap has a hemispherical structure, which facilitates unloading.

[0025] The positive and progressive effects of this utility model are as follows:

[0026] (1) The radial thermal cracking reactor of this utility model has low energy consumption. By setting a heat exchanger in the gas outlet pipe, the heat loss in the high-temperature section is reduced, and the temperature quality of the gas entering the cracking catalyst bed is improved. By setting a heating element in the annular space where the catalyst is packed, the cracking reaction temperature in any area of ​​the catalyst bed reaches or exceeds the catalyst activation temperature, so that the catalyst in the reactor is fully utilized and the conversion rate of ammonia cracking is improved. By combining the built-in heat exchanger with the external heating element, the conversion rate of ammonia cracking is improved while reducing energy consumption.

[0027] (2) The radial thermal cracking reactor of this utility model has a large catalyst loading, large production capacity, and controllable production scale. By adjusting the equipment specifications, the production capacity of a single ammonia cracking unit can reach 500kg / h to 3750kg / h.

[0028] (3) The radial thermal cracking reactor of this invention has a low gas linear velocity and a short path due to the use of a radial reactor, resulting in low gas resistance in the catalyst bed.

[0029] (4) The radial thermal pyrolysis reactor of this invention can be reused. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a methanol cracking hydrogen production reactor according to a preferred embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Reactor shell, 2-Gas outlet pipe, 3-Collector pipe, 4-Gas distribution cylinder, 5-First tube sheet, 6-Second tube sheet, 7-Gas inlet pipe, 8-Heat exchange tube, 9-Interlayer space, 10-First annular space, 11-Second annular space, 12-Third annular space, 13-Gas buffer chamber, 14-Gap, 15-Fourth annular space, 16-Heating element, 17-Support frame, 18-Insulation layer;

[0033] 101-Cylinder body, 102-Lower end cap, 103-Cover plate, 104-Discharge port;

[0034] 201 - First gas outlet pipe section, 202 - Second gas outlet pipe section, 203 - Third gas outlet pipe section, 204 - Gas outlet;

[0035] 301 - First through hole; 401 - Second through hole;

[0036] 701 - First gas inlet pipe section; 702 - Second gas inlet pipe section;

[0037] 1601 - Heating wire, 1602 - Protective tube, 1603 - Terminal block. Detailed Implementation

[0038] The present invention is further illustrated below by way of embodiments, but these embodiments do not limit the present invention to the scope of the embodiments described. Experimental methods in the following embodiments that do not specify specific conditions are performed according to conventional methods and conditions, or as selected according to the product instructions.

[0039] A specific embodiment of this utility model discloses a radial thermal pyrolysis reactor, such as... Figure 1 As shown, it includes a reactor shell 1 and a gas outlet pipe 2, a manifold 3, a gas distribution cylinder 4, a first tube sheet 5, a second tube sheet 6, a gas inlet pipe 7, a number of heat exchange tubes 8 and a number of heating elements 16 disposed within the reactor shell 1.

[0040] The first tube sheet 5 is provided with a first connecting hole and a second connecting hole; the second tube sheet 6 is provided with a third connecting hole;

[0041] Gas outlet pipe 2, manifold 3, and gas distribution cylinder 4 are arranged coaxially from the center outward along the radial direction of reactor shell 1; heat exchange tubes 8 are arranged side by side inside gas outlet pipe 2, and a sandwich space 9 is formed between heat exchange tubes 8 and gas outlet pipe 2; a first annular space 10 is formed between gas outlet pipe 2 and manifold 3; the tops of gas distribution cylinder 4 and manifold 3 are both connected to the first tube sheet 5, and the inner wall of gas distribution cylinder 4, the outer wall of manifold 3, the bottom wall of the first tube sheet 5, and the bottom wall of reactor shell 1 enclose a second annular space 11 for loading catalyst; a third annular space 12 is provided between the outer wall of gas distribution cylinder 4 and the inner side wall of reactor shell 1; a first through hole 301 and a second through hole 401 are respectively provided on manifold 3 and gas distribution cylinder 4, the first through hole 301 connects the first annular space 10 and the second annular space 11, and the second through hole 401 connects the second annular space 11 and the third annular space 12; the first through hole and the second through hole are both arranged radially along reactor shell 1.

[0042] A gas buffer chamber 13 is provided between the first tube sheet 5 and the top wall of the reactor shell 1, and the gas buffer chamber 13 is connected to the third annular space 12; a gap 14 for gas flow is provided between one end of the gas outlet pipe 2 and the bottom wall of the first tube sheet 5, and the other end of the gas outlet pipe 2 is provided at the bottom of the reactor shell 1; the top of the heat exchange tube 8 is sealed and connected to the first connection hole of the first tube sheet 5, and the heat exchange tube 8 is connected to the gas buffer chamber 13, and the bottom of the heat exchange tube 8 is sealed and connected to the third connection hole of the second tube sheet 6.

[0043] One end of the gas inlet pipe 7 is connected to the second tube sheet 6 and communicates with the bottom of the heat exchange tube 8. The other end of the gas inlet pipe 7 is located at the bottom of the reactor shell 1. A fourth annular space 15 is formed between the gas inlet pipe 7 and the gas outlet pipe 2. The fourth annular space 15 is connected in sequence with the interlayer space 9, the gap 14, and the first annular space 10.

[0044] A plurality of heating elements 16 are arranged side by side in the second annular space 11, and the heating elements 16 are sealed to the second connecting hole of the first tube sheet 5. In this embodiment, the plurality of heating elements 16 are arranged in concentric circles with the manifold 3 as the center, and the projections of two adjacent rings of heating elements 16 on the same circumferential surface are arranged at uniform intervals along the circumference of the circumferential surface.

[0045] In this embodiment, the heating element 16 includes a heating wire 1601, a protective tube 1602, and a terminal block 1603. The heating wire 1601 is disposed inside the protective tube 1602. One end of the terminal block 1603 is connected to the heating wire 1601, and the other end of the terminal block 1603 is connected to the top of the reactor shell 1.

[0046] In this embodiment, a support frame 17 is also provided in the second annular space 11. The support frame 17 is a steel frame and is connected to the manifold 3. The heating element 16 is connected to the support frame 17.

[0047] In this embodiment, the reactor shell 1 includes a cylindrical body 101, a lower end cap 102, and a cover plate 103. The lower end cap 102 and the cover plate 103 are respectively connected to both ends of the cylindrical body 101. The cover plate 103 is connected to the cylindrical body 101 via a flange. The lower end cap 102 is welded to the cylindrical body 101 and has a hemispherical structure. A discharge port 104 is provided at the bottom of the lower end cap 102. The discharge port is located around the gas outlet pipe 2 and is symmetrically arranged with the gas outlet pipe 2 as the center.

[0048] In this embodiment, the gas outlet pipe 2 includes a first gas outlet pipe section 201, a second gas outlet pipe section 202, and a third gas outlet pipe section 203 connected in sequence. The diameter of the first gas outlet pipe section 201 is larger than that of the third gas outlet pipe section 203. Both the first gas outlet pipe section 201 and the third gas outlet pipe section 203 are equal-diameter pipes. An outlet 204 is provided on the side of the third gas outlet pipe section 203. The second gas outlet pipe section 202 is an arc-shaped pipe with a gradually decreasing diameter from the first gas outlet pipe section 201 to the third gas outlet pipe section 203. The arc surface of the arc-shaped pipe convexes outward. The heat exchange pipe 8 is disposed in the first gas outlet pipe section 201. A fourth annular space 15 is formed between the second gas outlet pipe section 202 and the third gas outlet pipe section 203 and the gas inlet pipe 7.

[0049] In this embodiment, the gas inlet pipe 7 includes a first gas inlet pipe section 701 and a second gas inlet pipe section 702. The first gas inlet pipe section 701 is an arc-shaped pipe with a gradually decreasing diameter, and the arc surface of the arc-shaped pipe convexes outward. The larger diameter end of the first gas inlet pipe section 701 is connected to the second tube sheet 6, and the smaller diameter end of the first gas inlet pipe section 701 has the same diameter as the second gas inlet pipe section 702. The second gas inlet pipe section 702 is a pipe of equal diameter. The convex arc of the first gas inlet pipe section 701 and the second gas outlet pipe section 202 is the same.

[0050] In this embodiment, an annular end plate is provided at the bottom of the second annular space 11. The outer wall of the annular end plate is connected to the manifold 3, and the inner wall of the annular end plate is connected to the gas outlet pipe 2, so that the gas in the second annular space 11 flows through the first through hole 301. In this embodiment, the bottom of the gas distribution cylinder 4 is connected to the bottom inner wall of the reactor shell 1, so that the third annular space 12 forms a structure that is open at the top and closed at the bottom.

[0051] In another embodiment of the present invention, the radial pyrolysis reactor further includes a heat insulation layer 18 disposed on the inner wall of the reactor shell 1.

[0052] Example of effect:

[0053] Iron-based cracking catalyst A106 is packed into the second annular space 11 to form a catalyst bed.

[0054] The parameters of the iron-based cracking catalyst A106 are as follows: total iron content 68-72%, iron ratio 0.55-0.65, particle shape φ1.5×3.3 m, and bulk density 2.5-3.5 g / cm³. 3 Compressive strength ≥ 50 N / cm.

[0055] Ammonia gas at a flow rate of 73.39 kmol / h is preheated to approximately ~500°C and ~30 kPa gauge pressure by a preheater outside the radial thermal cracking reactor. It then enters the heat exchange tube 8 through the gas inlet pipe 7 to exchange heat with the reaction gas after the cracking reaction, which has a temperature of approximately ~820°C and a gauge pressure of ~20 kPa. The ammonia gas after heat exchange (temperature ~770°C, gauge pressure ~30 kPa) rises to the gas buffer chamber 13 and then flows downward into the third annular space 12. It enters the catalyst bed through the second through-hole 401 to carry out the ammonia cracking reaction to generate nitrogen and hydrogen. At the same time, the ammonia gas in the cracking reaction is heated by the heating element 16 to maintain the gas temperature of ~820°C required for ammonia cracking. Nitrogen and hydrogen (approximately ~820º, gauge pressure ~20Kpa) generated after ammonia cracking exit from the first through-hole 301 and enter the first annular space 10. After passing through the gap 14, they enter the interlayer space 9 and exchange heat with the ammonia in the heat exchange tube 8. The temperature drops to approximately ~580º, gauge pressure ~20Kpa, and the volume of hydrogen, nitrogen, and trace amounts of ammonia is 1250kg. After passing through the fourth annular space 15, they flow out from the outlet 204.

[0056] When the catalyst becomes ineffective, after the nitrogen purging is completed and the process is deemed satisfactory, the unloading port is opened and the used catalyst is automatically discharged through the unloading pipe.

[0057] The conversion rate of ammonia cracking is over 99.5%.

Claims

1. A radial pyrolysis reactor, characterized in that, It includes a reactor shell and a gas outlet pipe, a manifold, a gas distribution cylinder, a first tube sheet, a second tube sheet, a gas inlet pipe, a number of heat exchange tubes, and a number of heating elements disposed within the reactor shell; The first tube sheet is provided with a first connecting hole and a second connecting hole; the second tube sheet is provided with a third connecting hole; The gas outlet pipe, the manifold, and the gas distribution cylinder are coaxially arranged from the center outwards along the radial direction of the reactor shell; the heat exchange tubes are arranged side by side inside the gas outlet pipe, and a space is formed between the heat exchange tubes and the gas outlet pipe; a first annular space is formed between the gas outlet pipe and the manifold; the tops of the gas distribution cylinder and the manifold are both connected to the first tube sheet, and the inner wall of the gas distribution cylinder, the outer wall of the manifold, the bottom wall of the first tube sheet, and the bottom wall of the reactor shell enclose a second annular space for loading the catalyst; a third annular space is provided between the outer wall of the gas distribution cylinder and the inner wall of the reactor shell; a first through hole and a second through hole are respectively provided on the manifold and the gas distribution cylinder, the first through hole connecting the first annular space and the second annular space, and the second through hole connecting the second annular space and the third annular space; A gas buffer chamber is provided between the first tube sheet and the top wall of the reactor shell, and the gas buffer chamber is in communication with the third annular space; a gap for gas flow is provided between one end of the gas outlet pipe and the bottom wall of the first tube sheet, and the other end of the gas outlet pipe is located at the bottom of the reactor shell; the top of the heat exchange tube is sealed to the first connection hole of the first tube sheet, and the heat exchange tube is in communication with the gas buffer chamber, and the bottom of the heat exchange tube is sealed to the third connection hole of the second tube sheet; One end of the gas inlet pipe is connected to the second tube sheet and communicates with the bottom of the heat exchange tube. The other end of the gas inlet pipe is located at the bottom of the reactor shell. A fourth annular space is formed between the gas inlet pipe and the gas outlet pipe. The fourth annular space is sequentially connected to the interlayer space, the gap, and the first annular space. A plurality of the heating elements are disposed in the second annular space, and the heating elements are sealed to the second connection hole of the first tube sheet.

2. The radial pyrolysis reactor as described in claim 1, characterized in that, The bottom of the reactor shell is provided with a discharge port, which is located around the gas outlet pipe and is symmetrically arranged with the gas outlet pipe as the center. And / or, both the first through hole and the second through hole are arranged radially along the reactor shell.

3. The radial pyrolysis reactor as described in claim 1, characterized in that, Several heating elements are arranged in concentric circles around the manifold, and the projections of two adjacent rings of heating elements on the same circumferential surface are arranged at uniform intervals along the circumference of the circumferential surface.

4. A radial pyrolysis reactor as described in claim 1 or 3, characterized in that, The heating element includes a heating wire and a protective tube, wherein the heating wire is disposed inside the protective tube; The heating element is also connected to a terminal block, one end of which is connected to the heating wire, and the other end of which is connected to the top of the reactor shell.

5. A radial pyrolysis reactor as described in claim 1, characterized in that, A support frame is also provided in the second annular space. The support frame is fixed on the manifold, and the heating element is connected to the support frame.

6. A radial pyrolysis reactor as described in claim 1, characterized in that, The gas inlet pipe includes a first gas inlet pipe section and a second gas inlet pipe section. The first gas inlet pipe section is an arc-shaped pipe with a gradually decreasing diameter, and the arc surface of the arc-shaped pipe bulges outward. The larger diameter end of the first gas inlet pipe section is connected to the second tube sheet, and the smaller diameter end of the first gas inlet pipe section has the same diameter as the second gas inlet pipe section. The second gas inlet pipe section is a pipe with a constant diameter.

7. A radial pyrolysis reactor as described in claim 1, characterized in that, The gas outlet pipe includes a first gas outlet pipe section, a second gas outlet pipe section, and a third gas outlet pipe section connected in sequence; the diameter of the first gas outlet pipe section is larger than that of the third gas outlet pipe section, and both the first and third gas outlet pipe sections are equal-diameter pipes; the second gas outlet pipe section is an arc-shaped pipe with a gradually decreasing diameter from the first gas outlet pipe section to the third gas outlet pipe section, and the arc surface of the arc-shaped pipe convexes outward; the heat exchange pipe is disposed in the first gas outlet pipe section; and the second and third gas outlet pipe sections form the fourth annular space with the gas inlet pipe.

8. A radial pyrolysis reactor as described in claim 1, characterized in that, An annular end plate is provided at the bottom of the second annular space. The outer side wall of the annular end plate is connected to the manifold, and the inner side wall of the annular end plate is connected to the gas outlet pipe. And / or, the bottom of the gas distribution cylinder is connected to the bottom inner wall of the reactor shell.

9. A radial pyrolysis reactor as described in claim 1, characterized in that, The radial pyrolysis reactor also includes a heat insulation layer disposed on the inner wall of the reactor shell.

10. A radial pyrolysis reactor as described in claim 1, characterized in that, The reactor shell includes a cylindrical body, a lower end cap, and a cover plate. The lower end cap and the cover plate are respectively connected to both ends of the cylindrical body, and the cover plate is connected to the cylindrical body via a flange.

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