Regenerator with flow guiding structure

Abstract

The application discloses a regenerator with a flow guide structure, and the regenerator comprises a coking tank and a gas-solid separation zone which are connected in communication, a second dense phase bed is formed between the coking tank and the gas-solid separation zone, and a flow guide structure is arranged in the second dense phase bed, wherein the bottom of the coking tank is provided with a gas inlet, the sidewall of the coking tank is provided with a catalyst inlet; the sidewall of the second dense phase bed is provided with a catalyst outlet; the top of the gas-solid separation zone is provided with a flue gas outlet; the flow guide structure comprises a flow guide cylinder, an inner part of the flow guide cylinder is defined as a flow guide area, and an annular gap area is defined between the flow guide cylinder and the sidewall of the second dense phase bed; a plurality of flow baffles are arranged in the annular gap area, the flow baffles are connected between the flow guide cylinder and the second dense phase bed; and a first gas distributor is arranged at the lower part of the annular gap area. Through the arrangement of the flow guide structure, the problems of uneven distribution of catalysts, high-temperature tail combustion, unstable operation of the regenerator and decline of catalyst performance caused by vortexes in the second dense phase bed of the regenerator are solved.

Description

Technical Field

[0001] This invention relates to the field of fluidized catalytic cracking regeneration equipment technology, and in particular to a regenerator with a flow guiding structure. Background Technology

[0002] Fluid catalytic cracking (FCC) completes hydrocarbon conversion by contacting hydrocarbons with a catalyst in a fluidized reaction zone. During this process, a large amount of highly carbonaceous material, known as coke, deposits on the catalyst, deactivating it. Therefore, continuous catalyst regeneration is required via a regenerator. The high-coke-content catalyst (the spent catalyst) is continuously removed from the reaction zone and replaced by a nearly coke-free catalyst from the regeneration zone. Catalyst particles are transported between the reaction and regeneration zones via fluidization, maintaining high catalyst activity and system thermal equilibrium in the reaction zone. The goal of equipment structure optimization is to maximize reactor product yield while minimizing operating and maintenance costs. The purpose of the regeneration equipment is to obtain a fully regenerated catalyst, i.e., to completely remove coke from the catalyst, requiring sufficient contact time between the catalyst and oxygen to achieve complete coke combustion.

[0003] A traditional regenerator includes a coke burner and a second dense-phase bed connected to each other. The gas-solid separation zone at the top of the second dense-phase bed contains a cyclone separator and a large-pore distribution plate. The second dense-phase bed has an inlet for the catalyst to be generated and an outlet for the regenerated catalyst. In this regenerator, the coke on the catalyst is removed by combustion with an oxygen-containing gas, typically air, simultaneously forming flue gas. After treatment to remove entrained catalyst particles and carbon monoxide, the flue gas can be normally discharged into the atmosphere.

[0004] Because the lower part of the second dense phase bed of the regenerator is affected by the large-hole distribution plate and multiple outlets, the catalyst movement is complex and several small eddies are prone to occur, resulting in problems such as uneven distribution of catalyst particles and poor ventilation. In addition, when the oxygen content in the combustion gas is insufficient, the hot flue gas contains carbon monoxide, which will cause poor fluidization of the spent catalyst, causing tail combustion, leading to problems such as unstable operation of the regenerator and deterioration of the performance of the regenerated catalyst.

[0005] At the same time, the catalyst particles present in the dilute phase section of the regenerator (the area between the upper part of the second dense phase bed of the regenerator and the top of the regenerator) are insufficient to act as a heat carrier to absorb heat, which will cause the equipment inside the dilute phase section to be subjected to higher temperatures, which may exceed the alchemical limit, resulting in damage or severe deformation of the internal equipment. Summary of the Invention

[0006] The purpose of this invention is to provide a regenerator with a flow guiding structure, which solves the problems of uneven catalyst distribution caused by the easy formation of eddies in the second dense phase bed of the current regenerator, which in turn leads to high-temperature tail combustion, unstable operation of the regenerator, and decreased catalyst performance.

[0007] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0008] This invention provides a regenerator with a flow guiding structure. The regenerator includes a coking tank and a gas-solid separation zone connected in communication. A second dense phase bed is formed between the coking tank and the gas-solid separation zone. The flow guiding structure is disposed within the second dense phase bed.

[0009] The bottom of the coking tank is provided with a gas inlet, and the side wall of the coking tank is provided with a catalyst inlet;

[0010] The second dense phase bed has a catalyst outlet on its side wall;

[0011] The top of the gas-solid separation zone is provided with a flue gas outlet;

[0012] The flow guiding structure includes:

[0013] A flow guide tube is coaxially arranged with the side wall of the second dense phase bed. The interior of the flow guide tube defines a flow guide zone, and an annular gap zone is defined between the flow guide tube and the side wall of the second dense phase bed. The flow guide zone is connected to the main airflow.

[0014] Multiple baffles are located within the annular gap region, and the baffles are connected between the guide tube and the second dense phase bed;

[0015] A first gas distributor for introducing loosening air into the annular gap region is located at the lower part of the annular gap region.

[0016] In a preferred embodiment of the present invention, the gas flow direction in the guide zone is opposite to the gas flow direction in the annular gap zone, and the gas flow velocity in the guide zone is greater than the gas flow velocity in the annular gap zone.

[0017] In a preferred embodiment of the present invention, the upper part of the guide tube defines a separation zone, the lower part of the guide tube defines a distributor influence zone, the gas in the guide zone flows through the separation zone to the annular gap zone, and the gas in the annular gap zone flows through the distributor influence zone to the guide zone.

[0018] In a preferred embodiment of the present invention, the first gas distributor is an annular distribution pipe having a plurality of vent holes, the openings of which are disposed toward the annular gap region.

[0019] In a preferred embodiment of the present invention, the velocity of the loosening air output from the vent is 0.05 m / s to 0.3 m / s.

[0020] In a preferred embodiment of the present invention, the gas inlet of the coking tank is connected to a second gas distributor, and a large-hole distribution plate is provided at the connection between the coking tank and the second dense phase bed, the large-hole distribution plate being located at the lower part of the guide zone.

[0021] In a preferred embodiment of the present invention, the distance between the guide tube and the large-hole distribution plate is 0.5m to 3m.

[0022] In a preferred embodiment of the present invention, the regenerator further includes an internal circulation pipe connecting the second dense phase bed and the coking tube, the inlet of the internal circulation pipe being located on the side wall of the second dense phase bed, and the outlet of the internal circulation pipe being located on the side wall of the coking tank; a throttling valve is connected to the internal circulation pipe.

[0023] In a preferred embodiment of the invention, the regenerator further includes a cyclone separator for separating flue gas and regenerating catalyst, the cyclone separator being located at the top of the gas-solid separation zone.

[0024] In a preferred embodiment of the present invention, the interior of the coking tank is provided with a grid layer, which is located above the catalyst inlet.

[0025] In a preferred embodiment of the present invention, the guide tube is a cylindrical metal tube or a frustum-shaped metal tube with openings at both ends.

[0026] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0027] 1. The regenerator with a flow guiding structure described in this invention can promote the orderly circulation of catalyst particles in the second dense phase bed region, improve the relative motion between gas and catalyst particles in the second dense phase bed, improve heat transfer and coking rate, and improve the coking intensity of the main air.

[0028] 2. The regenerator with a flow guiding structure described in this invention can shear and break low-concentration bubbles, reduce the residence time of gas and catalyst particles in the second dense phase bed, improve the phenomena of eddies, high-density zones and uneven catalyst distribution inside the regenerator, improve oxygen utilization, and thus reduce the main air volume and prevent tail combustion.

[0029] 3. The regenerator with a flow guiding structure described in this invention has a simple flow guiding structure, low cost, easy installation and maintenance, good mixing performance, and high practical value. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0031] Figure 1 This is a schematic diagram of the regenerator with a flow guiding structure according to the present invention;

[0032] Figure 2 for Figure 1 The diagram shows a partially enlarged structural schematic of a regenerator with a flow guiding structure.

[0033] Figure 3 for Figure 2 The sectional view of MM shown;

[0034] Figure 4 This is a schematic diagram of gas flow in the flow guiding structure described in this invention;

[0035] Figure 5 This is a schematic diagram and a partial schematic diagram of the annular distribution pipe described in this invention.

[0036] Explanation of icon numbers:

[0037] 10. Coke burner; 11. Gas inlet; 12. Catalyst inlet; 13. Second gas distributor; 14. Grid layer;

[0038] 20. Gas-solid separation zone; 21. Flue gas outlet; 22. Cyclone separator;

[0039] 30. Second dense phase bed; 31. Catalyst outlet;

[0040] 40. Flow guiding structure; 41. Flow guiding tube; 42. Baffle plate; 43. First gas distributor; 431. Annular distribution pipe; 432. Vent hole; 44. Large-hole distribution plate;

[0041] 50. Internal circulation pipe; 51. Internal circulation pipe inlet; 52. Internal circulation pipe outlet; 53. Throttling valve;

[0042] A. Guide zone; B. Annular gap zone; C. Separation zone; D. Distributor influence zone; X. Main wind; Y. Loosening wind. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0044] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] like Figures 1 to 5 As shown, a regenerator with a flow guiding structure includes a coking tank 10 and a gas-solid separation zone 20 connected to each other. A second dense phase bed 30 is formed between the coking tank 10 and the gas-solid separation zone 20. A flow guiding structure 40 is provided within the second dense phase bed 30. The coking tank 10 has a gas inlet 11 at its bottom and a catalyst inlet 12 on its side wall. The second dense phase bed 30 has a catalyst outlet 31 on its side wall. The gas-solid separation zone 20 has a flue gas outlet 21 at its top. The flow guiding structure 40 includes a flow guiding cylinder 41. Multiple baffles 42 and a first gas distributor 43; a guide tube 41 is coaxially arranged with the side wall of the second dense phase bed 30, the interior of the guide tube 41 defines a guide zone A, and the area between the guide tube 41 and the side wall of the second dense phase bed 30 defines an annular gap zone B, through which the main air X flows; multiple baffles 42 are located in the annular gap zone B, and the baffles 42 are connected between the guide tube 41 and the second dense phase bed 30; the first gas distributor 43 is located at the lower part of the annular gap zone B, and the first gas distributor 43 is used to introduce loosening air Y into the annular gap zone B.

[0047] The second dense phase bed 30 of the regenerator described in this invention is provided with a flow guiding structure 40 for guiding the gas flow. The flow guiding structure 40 can guide the gas flow in the second dense phase bed 30 to circulate, thereby driving the catalyst in the gas to flow stably, making the catalyst evenly distributed, effectively reducing the generation of eddies, avoiding the occurrence of high-temperature tail combustion, and thus extending the service life of the regenerator.

[0048] Specifically, such as Figure 1 As shown, the regenerator of the present invention includes a coking tank 10 and a gas-solid separation zone 20 connected to each other, and a second dense phase bed 30 for second coking and decarbonization of the catalyst is formed at the connection between the coking tank 10 and the gas-solid separation zone 20.

[0049] The coking tank 10 is an open-top tank connected to a bottom-open gas-solid separation zone 20 via a transition structure. Coking gas (oxygen-containing gas, typically air) and the spent catalyst (a high-coke-content catalyst requiring coking regeneration) are mixed inside the coking tank 10 for the first coking and decarbonization reaction. The bottom of the coking tank 10 has a gas inlet 11 for introducing oxygen-containing gas; in this embodiment, air is introduced through the gas inlet 11. A catalyst inlet 12 is located on the side wall of the coking tank 10 for introducing the spent catalyst. The spent catalyst entering the coking tank 10 mixes with the air entering from the bottom and flows upwards with the air. At high temperature, the mixed spent catalyst and air undergo the first coking and decarbonization reaction, burning off some of the coke on the catalyst surface, thus initially regenerating the spent catalyst.

[0050] According to one embodiment of the present invention, such as Figure 1 As shown, the gas inlet 11 of the coking tank 10 is connected to a second gas distributor 13. The second gas distributor 13 has a disc-shaped structure, with its lower inlet connected to the gas inlet 11. The upper part of the second gas distributor 13 has multiple gas outlets. The second gas distributor 13 can evenly distribute air into the entire coking tank 10, so that it can be evenly mixed with the catalyst to be generated.

[0051] Furthermore, such as Figure 1 and Figure 2 As shown, a large-hole distribution plate 44 is provided at the connection between the coke burner 10 and the second dense phase bed 30. The large-hole distribution plate 44 is located at the lower part of the flow guiding structure 40. The large-hole distribution plate 44 is connected to the outlet of the coke burner 10. Multiple through holes are uniformly opened on the large-hole distribution plate 44. After the air and the catalyst to be generated are mixed and initially reacted, they can be uniformly distributed to the second dense phase bed 30 of the regenerator after passing through the through holes on the large-hole distribution plate 44.

[0052] According to one embodiment of the present invention, such as Figure 1As shown, the coking tank 10 has a grid layer 14 inside, which is located above the catalyst inlet 12. The grid layer 14 can evenly distribute the catalyst to be generated into the coking tank 10. The evenly distributed catalyst can mix evenly with the upward-flowing air and flow upward under the action of the air.

[0053] like Figures 2 to 4 As shown, the second dense phase bed 30 is provided with a flow guiding structure 40. The flow guiding cylinder 41 is a cylindrical metal cylinder open at both ends. A baffle plate 42 is connected between the outer wall of the flow guiding cylinder 41 and the side wall of the second dense phase bed 30. The flow guiding cylinder 41 is fixed to the second dense phase bed 30 by the baffle plate 42. The flow guiding cylinder 41 is coaxially arranged with the regenerator and located above the large-hole distribution plate 44. Preferably, the distance between the flow guiding cylinder 41 and the large-hole distribution plate 44 is 0.5m to 3m, the height of the flow guiding cylinder 41 is 0.7m to 3.0m, and the diameter D1 of the flow guiding cylinder 41 is 0.7 to 0.9 times the diameter D2 of the second dense phase bed 30. The structural dimensions of the flow guiding cylinder 41 are related to the size of the regenerator, the catalyst throughput, the gas velocity, and the bed density, and can be adjusted according to actual production needs. No specific limitation is made here.

[0054] In a preferred embodiment of the present invention, the guide tube 41 is a frustum-shaped metal tube with openings at both ends, which matches the sidewall of the second dense phase bed 30. The large end opening of the frustum-shaped guide tube 41 faces the gas-solid separation zone 20, and the small end opening of the frustum-shaped guide tube 41 faces the coking tank 10.

[0055] In a preferred embodiment of the invention, such as Figure 3 As shown, some baffles 42 are connected to both the outer wall of the guide tube 41 and the side wall of the second dense phase bed 30, while other baffles 42 are only connected to the outer wall of the guide tube 41. In this embodiment, the baffles 42 with the above two connection structures are arranged alternately along the circumference of the guide tube 41.

[0056] Furthermore, such as Figure 4 As shown, a cylindrical guiding zone A is defined inside the guide tube 41. Air and the catalyst to be generated in the coke burner 10 are introduced into the guiding zone A inside the guide tube 41 as the main airflow X after passing through the large-hole distribution plate 44. The main airflow X flows vertically upward. An annular gap zone B is defined between the guide tube 41 and the side wall of the second dense phase bed 30. Multiple baffles 42 are located in the annular gap zone B. The baffles 42 can reduce radial backmixing in the annular gap zone B and shear the bubbles in the annular gap zone B. At the same time, they can promote the orderly circulation of the catalyst to be generated in the second dense phase bed 30, making the catalyst distribution more uniform. A separation zone C is defined at the upper part of the guide tube 41. A distributor influence zone D is defined at the lower part of the guide tube 41. The gas in the guiding zone A flows to the annular gap zone B through the separation zone C, and the gas in the annular gap zone B flows to the guiding zone A through the distributor influence zone D.

[0057] The gas flow velocity in the guiding zone A is greater than that in the annular zone B, resulting in a high gas content, high gas holdup, and low bed density in the particle bed. Conversely, the gas flow velocity in the annular zone B is relatively lower, leading to a lower gas holdup and higher bed density. Therefore, the static pressure of the fluid in the annular zone B is greater than that in the guiding zone A, propelling the catalytic particles from the annular zone B through the distributor's influence zone D to the guiding zone A.

[0058] The flow guiding structure 40 divides the flow space within the second dense phase bed 30 into a guiding zone A, a separation zone C, an annular gap zone B, and a distributor-influenced zone D, enabling the gas to carry the catalyst to be generated to form an ordered circulation between these zones. This ordered circulation within the second dense phase bed 30 increases the relative velocity between the gas and catalyst particles in the regenerator's second dense phase, accelerates catalyst surface renewal, reduces heat and mass transfer resistance at the gas-catalyst interface, improves heat transfer and coking rates, and enhances the coking intensity of the main airflow X. The presence of this ordered circulation also reduces the stagnation time of the gas and catalyst within the second dense phase bed 30, mitigating the problems of eddies, high-density zones, and uneven catalyst distribution within the regenerator.

[0059] Furthermore, such as Figure 2 and Figure 4 As shown, a first gas distributor 43 is provided at the lower part of the annular region B. The first gas distributor 43 is used to introduce loosening air Y into the annular region B, and the flow direction of loosening air Y is vertically upward. The gas holdup inside the annular region B is relatively low, the bed density is relatively high, the catalyst particles are relatively dense, and the gas flow state is unstable. The loosening air Y is introduced into the annular region B to improve the flow state of the catalyst inside the annular region B.

[0060] Specifically, such as Figure 5 As shown, the first gas distributor 43 is an annular distribution pipe 431 with multiple vent holes 432. The openings of the vent holes 432 face the annular gap region B. Air flows through the annular distribution pipe 431, and the air flowing out of the vent holes 432 flows in the opposite direction to the gas flow in the annular gap region B, which is used to improve the gas flow state in the annular gap region B. When the gas velocity of the first gas distributor 43 is low, the catalyst particles are prone to forming dead zones near the inner wall of the regenerator; when the gas velocity of the first gas distributor 43 is high, the catalyst particles are prone to forming "bubbles" with low solid content in the annular gap region B, which impact the catalyst particles sliding down the inner wall of the regenerator, which is detrimental to the catalyst circulation; preferably, the flow velocity of the loosening air Y output from the vent holes 432 is 0.05 m / s to 0.3 m / s. The gas velocity of the first gas distributor 43 should be considered from multiple aspects such as the gas velocity of the main air X, bed density, equipment size and the installation position of the guide tube 41, and can be adjusted according to actual needs. No specific limitation is made here.

[0061] like Figure 1 As shown, the gas-solid separation zone 20 is a tank with an open bottom. The bottom is connected to the coking tank 10 with an open top through a transition structure. The top of the gas-solid separation zone 20 is provided with a flue gas outlet 21. The flue gas separated inside the gas-solid separation zone 20 is discharged through the flue gas outlet 21.

[0062] Furthermore, a cyclone separator 22 is installed inside the gas-solid separation zone 20, located at the top of the gas-solid separation zone 20. After the air and the spent catalyst undergo two coking processes, the resulting flue gas and the regenerated catalyst (the catalyst that has regained its activity after coking) pass through the cyclone separator 22, separating the flue gas from the regenerated catalyst. The flue gas is then discharged through the flue gas outlet 21. A catalyst outlet 31 is provided on the side wall of the second dense phase bed 30, through which the regenerated catalyst separated by the cyclone separator 22 is discharged.

[0063] According to one embodiment of the present invention, such as Figure 1 As shown, the regenerator also includes an internal circulation pipe 50 that connects the second dense phase bed 30 and the coking tube. The inlet of the internal circulation pipe 50 is located on the side wall of the second dense phase bed 30, and the outlet of the internal circulation pipe 50 is located on the side wall of the coking tank 10. A throttle valve 53 is connected to the internal circulation pipe 50.

[0064] The inner circulation pipe 50 is used to guide the catalyst in the second dense phase bed 30 to the coke burner 10, so that it can undergo the coke burn and decarbonization process again, ensuring that the coke on the surface of the catalyst can be completely removed and the catalyst can be completely regenerated; the throttle valve 53 on the inner circulation pipe 50 can control the gas flow rate in the inner circulation pipe 50, thereby controlling the proportion of catalyst entering the inner circulation pipe for circulation and regeneration.

[0065] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A regenerator with a flow guiding structure, characterized in that, The regenerator includes a coking tank (10) and a gas-solid separation zone (20) connected to each other. A second dense phase bed (30) is formed between the coking tank (10) and the gas-solid separation zone (20). A flow guiding structure (40) is provided in the second dense phase bed (30). The bottom of the coking tank (10) is provided with a gas inlet (11), and the side wall of the coking tank (10) is provided with a catalyst inlet (12). The second dense phase bed (30) has a catalyst outlet (31) on its side wall; The top of the gas-solid separation zone (20) is provided with a flue gas outlet (21); The flow guiding structure (40) includes: A flow guide tube (41) is coaxially arranged with the side wall of the second dense phase bed (30). The interior of the flow guide tube (41) defines a flow guide zone (A). An annular gap zone (B) is defined between the flow guide tube (41) and the side wall of the second dense phase bed (30). The flow guide zone (A) is connected to the main airflow (X). Multiple baffles (42) are located within the annular region (B). The baffles (42) are connected between the guide tube (41) and the second dense phase bed (30). The baffles (42) can reduce radial backmixing in the annular region (B) and shear the bubbles in the annular region (B), while promoting the orderly circulation of the catalyst in the second dense phase bed (30) so that the catalyst is more evenly distributed. A first gas distributor (43) for introducing loosening air (Y) into the annular gap region (B) is located at the lower part of the annular gap region (B); The coking tank (10) has a grid layer (14) inside, which is located above the catalyst inlet (12).

2. The regenerator with a flow guiding structure according to claim 1, characterized in that, The gas flow direction in the guide zone (A) is opposite to the gas flow direction in the annular gap zone (B), and the gas flow velocity in the guide zone (A) is greater than the gas flow velocity in the annular gap zone (B).

3. The regenerator with a flow guiding structure according to claim 2, characterized in that, The upper part of the guide tube (41) defines a separation zone (C), and the lower part of the guide tube (41) defines a distributor influence zone (D). The gas in the guide zone (A) flows through the separation zone (C) to the annular gap zone (B), and the gas in the annular gap zone (B) flows through the distributor influence zone (D) to the guide zone (A).

4. The regenerator with a flow guiding structure according to any one of claims 1 to 3, characterized in that, The first gas distributor (43) is an annular distribution pipe (431) with multiple vent holes (432), the openings of which are oriented toward the annular gap region (B).

5. The regenerator with a flow guiding structure according to claim 4, characterized in that, The velocity of the loosening air (Y) output from the vent (432) is 0.05 m / s to 0.3 m / s.

6. The regenerator with a flow guiding structure according to claim 1, characterized in that, The gas inlet (11) of the coking tank (10) is connected to a second gas distributor (13), and a large-hole distribution plate (44) is provided at the connection between the coking tank (10) and the second dense phase bed (30). The large-hole distribution plate (44) is located at the lower part of the guide zone (A).

7. The regenerator with a flow guiding structure according to claim 6, characterized in that, The distance between the guide tube (41) and the large-hole distribution plate (44) is 0.5m to 3m.

8. The regenerator with a flow guiding structure according to claim 1, characterized in that, The regenerator also includes an internal circulation pipe (50) connecting the second dense phase bed (30) and the coking tank (10). The inlet of the internal circulation pipe (50) is located on the side wall of the second dense phase bed (30), and the outlet of the internal circulation pipe (50) is located on the side wall of the coking tank (10). A throttle valve (53) is connected to the internal circulation pipe (50).

9. The regenerator with a flow guiding structure according to claim 8, characterized in that, The regenerator also includes a cyclone separator (22) for separating flue gas and regenerating catalyst, the cyclone separator (22) being located at the top of the gas-solid separation zone (20).

10. The regenerator with a flow guiding structure according to claim 1, characterized in that, The guide tube (41) is a cylindrical metal tube or a frustum-shaped metal tube with openings at both ends.

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