Fluidized bed reactor

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a fluidized bed reactor. The fluidized bed reactor comprises a reactor body, a gas distribution structure and a discharging structure, wherein the reactor body is internally provided with a reaction space; the gas distribution structure is located at the bottom of the reactor body and comprises a gas distribution plate and a gas inlet pipe, the gas distribution plate is located in the reaction space, a plurality of exhaust holes are formed in the gas distribution plate, and the gas inlet pipe is communicated with the exhaust holes and the outside; the discharge structure is arranged at the bottom of the reactor body and comprises a plurality of discharge holes and a discharge pipe, the discharge holes are formed in the gas distribution plate, and the discharge pipe is communicated with the discharge holes and the outside. By applying the technical scheme of the invention, the problem that the fluidized bed reactor needs to be regularly shut down and cleaned in the prior art can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of chemical engineering, and in particular to a fluidized bed reactor. Background Art

[0002] In the petrochemical, petrochemical, pharmaceutical and other industries, fluidized bed reactors, as the core key equipment of the entire system, play an important role in the output of the entire device or the entire product.

[0003] Part of the materials reacting in the fluidized bed reactor will form large particles, which are easy to accumulate and block the exhaust holes of the gas distribution plate, affecting the uniform entry of the airflow in the lower part of the fluidized bed, forming a vicious circle.

[0004] At present, fluidized bed reactors need to be shut down regularly to clean the exhaust holes of the gas distribution plate to ensure smooth exhaust from the exhaust holes. This method results in short continuous production time, high energy consumption, time-consuming and labor-intensive, and affects the safe and stable operation of equipment and systems and the improvement of production capacity and efficiency. Utility Model Content

[0005] The present application provides a fluidized bed reactor, which is used to solve the problem in the related art that the fluidized bed reactor needs to be shut down and cleaned regularly.

[0006] The present application provides a fluidized bed reactor, comprising:

[0007] A reactor body having a reaction space therein;

[0008] The gas distribution structure is located at the bottom of the reactor body. The gas distribution structure includes a gas distribution plate and an air inlet pipe. The gas distribution plate is located in the reaction space. A plurality of exhaust holes are arranged on the gas distribution plate. The air inlet pipe connects the exhaust holes with the outside.

[0009] The discharge structure is arranged at the bottom of the reactor body, and comprises a plurality of discharge holes and a discharge pipe. The plurality of discharge holes are arranged on the gas distribution plate, and the discharge pipe connects the plurality of discharge holes with the outside.

[0010] In some embodiments, the discharge pipe includes a discharge main pipe and a discharge branch pipe, the discharge branch pipe includes multiple discharge branch pipes and is arranged one-to-one corresponding to multiple discharge holes, the discharge main pipe passes through the reactor body, and each discharge branch pipe connects a discharge hole and the discharge main pipe.

[0011] In some embodiments, the cross-sectional area of ​​the gas distribution plate gradually decreases from the top to the bottom of the reactor body, a plurality of discharge holes are arranged near the bottom of the gas distribution plate, and the plurality of discharge holes are arranged at intervals in the circumferential direction of the gas distribution plate.

[0012] In some embodiments, the gas distribution plate is an inverted conical plate structure.

[0013] In some embodiments, the discharge main pipe includes an annular pipe section and a collecting pipe section connected to the annular pipe section, the first end of the discharge branch pipe is connected to the discharge hole, the second end of the discharge branch pipe is connected to the annular pipe section, and the second ends of the multiple discharge branch pipes are spaced apart in the circumferential direction of the annular pipe section.

[0014] In some embodiments, the annular pipe segment is arranged obliquely, and the collecting pipe segment is connected to the lowest end of the annular pipe segment and passes through the reactor body.

[0015] In some embodiments, the angle α between the plane where the axis of the annular tube segment is located and the horizontal plane is between 30° and 45°.

[0016] In some embodiments, a flared portion is disposed at the first end of the discharge branch pipe, the flared portion is connected to the discharge hole, and the flow area of ​​the flared portion gradually increases in a direction from away from the discharge hole to close to the discharge hole.

[0017] In some embodiments, the fluidized bed reactor further includes: a feed pipe, the feed pipe is located at the bottom of the reactor body, a first end of the feed pipe passes through the gas distribution plate, and the other end of the feed pipe passes through the reactor body and is connected to the outside.

[0018] In some embodiments, the first end of the feed pipe passes through the bottom end of the gas distribution plate and protrudes from the top surface of the gas distribution plate, multiple discharge holes are distributed on the circumferential outside of the feed pipe, and multiple exhaust holes are distributed on the circumferential outside of the multiple discharge holes.

[0019] The fluidized bed reactor provided in the present application includes a reactor body, a reaction space is provided in the reactor body, a gas distribution structure is located in the reaction space and at the bottom of the reactor body, the gas distribution structure includes a gas distribution plate and an air inlet pipe, the air inlet pipe is used to guide the spraying airflow that makes the split material flow, and a plurality of exhaust holes are arranged on the gas distribution plate, and the plurality of exhaust holes are evenly distributed on the gas distribution plate, so that the airflow can be evenly blown into the reaction space to ensure the reaction effect of the split material. The fluidized bed reactor includes a discharge structure at the bottom of the reactor body, the discharge structure includes a plurality of discharge holes and a discharge pipe, and the plurality of discharge holes are arranged on the gas distribution plate, and the discharge pipe connects the plurality of discharge holes with the outside world. Due to the provision of the discharge structure, when the powder is deposited on the gas distribution plate, it can be discharged from the plurality of discharge holes, and discharged to the outside world through the guidance of the discharge pipe, thereby reducing the probability of the powder blocking the exhaust holes and ensuring the uniformity of the airflow sprayed from the gas distribution plate. At the same time, since the discharge holes are provided, the materials deposited on the gas distribution plate can be discharged continuously, so that the interval of shutdown and maintenance can be effectively extended, ensuring the working continuity of the fluidized bed reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram of the partial structure of a fluidized bed reactor provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of the AA structure of the fluidized bed reactor.

[0023] Description of reference numerals:

[0024] 100. Reactor body; 101. Reaction space;

[0025] 200. gas distribution structure; 210. gas distribution plate; 220. air inlet pipe;

[0026] 300, discharge structure; 310, discharge hole; 320, discharge pipe; 321, discharge main pipe; 3211, annular pipe section; 3212, collecting pipe section; 322, discharge branch pipe;

[0027] 400. Feed pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the related art, during the reaction process of the fluidized bed reactor, the airflow is discharged from the exhaust holes of the gas distribution plate, and the upwardly ejected airflow drives the powder to flow upward. Under the action of the airflow, some powder particles are continuously collided and reacted, and are carried out by the airflow and discharged from the top of the fluidized bed reactor. Other powder particles may be deposited on the gas distribution plate during the reaction process, causing the exhaust holes of the gas distribution plate to be blocked.

[0030] Generally speaking, the materials deposited on the gas manifold may come from the following sources:

[0031] First, when the fluidized bed reactor is used for vapor deposition reaction, the bed particles in the reaction space above the gas distribution plate gradually grow larger and need to be continuously discharged from the bottom of the reactor;

[0032] Secondly, due to the uneven distribution of gas-solid phase fluid in the fluidized bed reaction zone and inadequate reaction, the powder particles do not react and thus naturally sink due to gravity.

[0033] Third, the airflow is lifted vertically upward and collides with the bottom of the tube bundle of the fluidized bed reactor, turning around and depositing downward.

[0034] Fourthly, the reaction process of the fluidized bed reactor is actually an exothermic reaction. If the powder particles are not fully fluidized, the internal tube bundle of the fluidized bed reactor will experience local overheating due to uneven heat dissipation, causing the reactants to sinter and form carbon deposits. Excessive accumulation will fall off to the gas diverter plate due to its own gravity or due to airflow blowing.

[0035] Due to the above reasons, part of the material deposited on the gas distribution plate is re-blown and fluidized by the airflow passing through the gas distribution plate, and part of it accumulates and blocks the holes of the gas distribution plate, affecting the uniform entry of the airflow at the bottom of the fluidized bed, forming a vicious cycle. Affected by the inverted cone structure of the gas distribution plate, the powder that falls but is not blown up will gather and accumulate at the bottom of the gas distribution plate, and further expand to the periphery. The expansion of the powder particle accumulation layer will also cause some non-reactive particles to be settled to be mixed again, squeezing out the reaction space of the reactive particles, greatly reducing the reaction efficiency of the fluidized bed reactor.

[0036] At present, due to the lack of continuous discharge structure at the bottom of large-scale fluidized bed reactors, the falling powder easily blocks the gas distribution plate. After a period of time, the reactor must be stopped, disassembled and cleaned, resulting in short continuous production time, high energy consumption, time-consuming and labor-intensive, affecting the safe and stable operation of equipment and systems and the improvement of production capacity and efficiency.

[0037] In view of this, the present application provides a fluidized bed reactor, in which a discharge structure is added to the bottom of the fluidized bed reactor so that the materials accumulated on the gas distribution plate can be quickly discharged, which can effectively reduce the blockage problem of the gas distribution plate caused by excessive accumulation of powder at the bottom of the fluidized bed layer, and allow the gas to smoothly and evenly pass through the gas distribution plate into the fluidized bed, so that the material is fully fluidized, ensuring continuous and efficient production operations.

[0038] The fluidized bed reactor provided in the embodiments of the present application is described below with reference to the accompanying drawings.

[0039] Figure 1 A schematic diagram of the partial structure of a fluidized bed reactor provided in an embodiment of the present application.

[0040] like Figure 1 As shown, the fluidized bed reactor of this embodiment includes: a reactor body 100 , a gas distribution structure 200 and a discharge structure 300 .

[0041] The reactor body 100 has a reaction space 101 therein;

[0042] The gas distribution structure 200 is located at the bottom of the reactor body 100. The gas distribution structure 200 includes a gas distribution plate 210 and an air inlet pipe 220. The gas distribution plate 210 is located in the reaction space 101. A plurality of exhaust holes are provided on the gas distribution plate 210. The air inlet pipe 220 connects the exhaust holes with the outside.

[0043] The discharge structure 300 is disposed at the bottom of the reactor body 100 , and includes a plurality of discharge holes 310 and a discharge pipe 320 . The plurality of discharge holes 310 are disposed on the gas distribution plate 210 , and the discharge pipe 320 connects the plurality of discharge holes 310 with the outside.

[0044] The technical solution of this embodiment is applied, and the fluidized bed reactor includes a reactor body 100, and the reactor body 100 has a reaction space 101, and a gas distribution structure 200 is located in the reaction space 101 and at the bottom of the reactor body 100, and the gas distribution structure 200 includes a gas distribution plate 210 and an air inlet pipe 220, and the air inlet pipe 220 is used to guide the injection airflow that makes the split material flow, and the gas distribution plate 210 is provided with a plurality of exhaust holes, and the plurality of exhaust holes are evenly distributed on the gas distribution plate 210, so that the airflow can be evenly blown into the reaction space 101 to ensure the reaction effect of the split material. The fluidized bed reactor includes a discharge structure 300 at the bottom of the reactor body 100, and the discharge structure 300 includes a plurality of discharge holes 310 and a discharge pipe 320, and the plurality of discharge holes 310 are provided on the gas distribution plate 210, and the discharge pipe 320 connects the plurality of discharge holes 310 with the outside. Due to the provision of the discharge structure 300, when the powder is deposited on the gas distribution plate 210, it can be discharged from the multiple discharge holes 310 and discharged to the outside through the discharge pipe 320, thereby reducing the probability of the powder blocking the exhaust holes and ensuring the uniformity of the air flow sprayed from the gas distribution plate 210. At the same time, due to the provision of the discharge holes 310, the material deposited on the gas distribution plate 210 can be discharged continuously, so that the interval of shutdown and maintenance can be effectively extended, ensuring the working continuity of the fluidized bed reactor.

[0045] Figure 2 for Figure 1 Schematic diagram of the AA structure of the fluidized bed reactor.

[0046] like Figure 1 and Figure 2 As shown, in some embodiments, the discharge pipe 320 includes a discharge main pipe 321 and a discharge branch pipe 322. The discharge branch pipe 322 includes multiple discharge holes 310 and is arranged one-to-one with the multiple discharge holes 310. The discharge main pipe 321 passes through the reactor body 100, and each discharge branch pipe 322 connects a discharge hole 310 and the discharge main pipe 321.

[0047] In the above structure, since multiple discharge holes 310 are provided, in order to facilitate the timely discharge of materials discharged from the discharge holes 310, multiple discharge branch pipes 322 can be provided, so that each discharge branch pipe 322 is provided corresponding to a discharge hole 310, and the materials discharged from the discharge hole 310 are timely guided to the discharge main pipe 321, and then the discharge main pipe 321 guides the materials out of the reactor body to prevent the materials from accumulating in the discharge hole 310.

[0048] Of course, in some embodiments, one discharge branch pipe may be arranged corresponding to multiple discharge holes, that is, materials from multiple discharge holes are discharged from one discharge branch pipe. For example, one discharge branch pipe may be arranged corresponding to 2-3 discharge holes.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the cross-sectional area of ​​the gas distribution plate 210 gradually decreases in the direction from the top to the bottom of the reactor body 100, a plurality of discharge holes 310 are arranged near the bottom of the gas distribution plate 210, and the plurality of discharge holes 310 are arranged at intervals in the circumferential direction of the gas distribution plate 210.

[0050] In the above structure, since the cross-sectional area of ​​the gas distribution plate 210 gradually decreases in the direction from the top to the bottom of the reactor body 100, the powder falling on the gas distribution plate 210 has a tendency to flow to the bottom of the gas distribution plate 210. Therefore, a plurality of discharge holes 310 are arranged close to the bottom of the gas distribution plate 210, so that the discharge holes 310 are arranged on the sliding path of the material, thereby facilitating the discharge of the material from the discharge holes 310.

[0051] On the other hand, materials generally begin to accumulate on the gas distribution plate 210 from the lowest point of the gas distribution plate 210 and gradually spread upwards. Setting multiple discharge holes 310 close to the bottom of the gas distribution plate 210 can also effectively reduce the probability of powder accumulation, avoid sticking and agglomerating, and carbonized materials from re-entering the reaction space to react, occupying the reaction space of the reactive particles and affecting the reaction effect of the fluidized bed.

[0052] Exemplarily, the gas distribution plate 210 is an inverted cone plate structure. This arrangement can increase the surface area of ​​the gas distribution plate, so that there is more space on the gas distribution plate to set the exhaust holes, thereby increasing the reaction volume of the fluidized bed reactor. On the other hand, the inverted cone plate structure also makes the overall structure of the gas distribution plate 210 smoother, so that the material falling on the gas distribution plate 210 can smoothly slide to the bottom of the gas distribution plate 210, and then smoothly discharged from the discharge hole 310.

[0053] like Figure 1 and Figure 2As shown, in some embodiments, the discharge main pipe 321 includes an annular pipe segment 3211 and a collecting pipe segment 3212 connected to the annular pipe segment 3211, the first end of the discharge branch pipe 322 is connected to the discharge hole 310, the second end of the discharge branch pipe 322 is connected to the annular pipe segment 3211, and the second ends of the plurality of discharge branch pipes 322 are spaced apart in the circumferential direction of the annular pipe segment 3211.

[0054] In the above structure, since the multiple discharge holes 310 are arranged at intervals in the circumferential direction of the gas distribution plate 210, the multiple discharge branch pipes 322 are arranged one by one corresponding to the positions of the multiple discharge holes 310, and they are also arranged at intervals in the circumferential direction of the gas distribution plate 210. The discharge main pipe 321 has the function of connecting the multiple discharge branch pipes 322 at the same time. Therefore, the discharge main pipe 321 can be divided into an annular pipe section 3211 and a collecting pipe section 3212 connected to the annular pipe section 3211. The annular structure of the annular pipe section 3211 corresponds to the distribution state of the multiple discharge branch pipes 322, so that the multiple discharge branch pipes 322 can all be connected to the annular pipe section 3211.

[0055] The arrangement of the annular pipe section 3211 can make the structure of the discharge branch pipe 322 simple and the pipe path short, so that the material can quickly pass through the discharge branch pipe 322 into the discharge main pipe, reducing the probability of material accumulation in the discharge branch pipe 322.

[0056] In addition, after passing through the annular pipe section 3211 , the material can be discharged from the reaction space 101 through the collecting pipe section 3212 .

[0057] It should be noted that the inner diameter of the discharge main pipe can be larger than the inner diameter of the discharge branch pipe so that the material can be discharged quickly.

[0058] like Figure 1 and Figure 2 As shown, in some embodiments, the annular pipe segment 3211 is tilted, and the collecting pipe segment 3212 is connected to the lowest end of the annular pipe segment 3211 and passes through the reactor body 100.

[0059] Such an arrangement enables the material entering the annular pipe section 3211 to slide down under the action of its own gravity, thereby enabling the material to be smoothly discharged from the discharge pipe to the outside.

[0060] like Figure 1 and Figure 2 As shown, in some embodiments, the angle α between the plane where the axis of the annular pipe segment 3211 is located and the horizontal plane is between 30° and 45°, thereby ensuring that the material can slide smoothly from the annular pipe segment 3211.

[0061] Exemplarily, the angle α between the plane where the axis of the annular pipe segment 3211 is located and the horizontal plane includes, but is not limited to, 30°, 40°, and 45°.

[0062] It should be noted that the above-mentioned “axis line of the annular tube segment 3211 ” refers to the axis line inside the annular tube and extending along the extension path of the annular tube, and its shape is an annular coil.

[0063] The above-mentioned “plane where the axis of the annular pipe segment 3211 is located” refers to the plane where the axis of the annular pipe segment 3211 is located.

[0064] The above-mentioned "horizontal plane" refers to the radial cross section of the reactor body perpendicular to the plumb plane.

[0065] like Figure 1 and Figure 2 As shown, in some embodiments, the first end of the discharge branch pipe 322 is provided with a flared portion, which is connected to the discharge hole 310 , and the flow area of ​​the flared portion gradually increases in a direction away from the discharge hole 310 to close to the discharge hole 310 .

[0066] In the above structure, the expanded portion can guide the material, so that the material flows into the discharge branch pipe 322 more smoothly.

[0067] It should be noted that the diameter of the discharge hole 310 may be the same as that of the exhaust hole, or may be larger than the diameter of the exhaust hole.

[0068] like Figure 1 and Figure 2 As shown, in some embodiments, the fluidized bed reactor also includes: a feed pipe 400, the feed pipe 400 is located at the bottom of the reactor body 100, the first end of the feed pipe 400 is passed through the gas distribution plate 210, and the other end of the feed pipe 400 passes through the reactor body 100 and is connected to the outside.

[0069] In the above structure, the material to be reacted enters from the feed pipe 400 and flows to the top of the gas distribution plate 210. The airflow blown out from the exhaust hole of the gas distribution plate 210 can blow the material to be reacted upward and drive it to the reaction space 101 for reaction. A part of the reacted material can be discharged from the top of the reactor body 100. Another part will be deposited on the gas distribution plate 210 and discharged from the discharge hole to the outside of the reactor body 100, forming a continuous cycle operation.

[0070] Furthermore, if Figure 1 and Figure 2As shown, in some embodiments, the first end of the feed pipe 400 passes through the bottom end of the gas distribution plate 210 and protrudes from the top surface of the gas distribution plate 210, a plurality of discharge holes 310 are distributed on the circumferential outside of the feed pipe 400, and a plurality of exhaust holes are distributed on the circumferential outside of the plurality of discharge holes 310.

[0071] In the above structure, the first end of the feed pipe 400 protrudes from the top surface of the gas distribution plate 210, so that the material to be reacted entering the gas distribution plate 210 can flow along the direction of the feed pipe 400 for a path and then disperse, thereby reducing the probability of the material to be reacted directly depositing at the discharge hole 310, thereby ensuring the reaction efficiency of the material.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0074] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0075] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0076] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A fluidized bed reactor, characterized in that: include: A reactor body having a reaction space therein; A gas distribution structure is located at the bottom of the reactor body, the gas distribution structure includes a gas distribution plate and an air inlet pipe, the gas distribution plate is located in the reaction space, a plurality of exhaust holes are arranged on the gas distribution plate, and the air inlet pipe connects the exhaust holes with the outside; A discharge structure is arranged at the bottom of the reactor body, and the discharge structure includes a plurality of discharge holes and a discharge pipe. The plurality of discharge holes are arranged on the gas distribution plate, and the discharge pipe connects the plurality of discharge holes with the outside.

2. The fluidized bed reactor according to claim 1, characterized in that The discharge pipe includes a discharge main pipe and a discharge branch pipe. The discharge branch pipes include a plurality of discharge branch pipes and are arranged one-to-one corresponding to the plurality of discharge holes. The discharge main pipe passes through the reactor body, and each discharge branch pipe is connected to a discharge hole and the discharge main pipe.

3. The fluidized bed reactor according to claim 2, characterized in that: The cross-sectional area of ​​the gas distribution plate gradually decreases from the top to the bottom of the reactor body, a plurality of discharge holes are arranged near the bottom of the gas distribution plate, and a plurality of discharge holes are arranged at intervals in the circumferential direction of the gas distribution plate.

4. The fluidized bed reactor according to claim 3, characterized in that The gas distribution plate is an inverted cone-shaped plate structure.

5. The fluidized bed reactor according to claim 3, characterized in that: The discharge main pipe includes an annular pipe section and a collecting pipe section connected to the annular pipe section. The first end of the discharge branch pipe is connected to the discharge hole, and the second end of the discharge branch pipe is connected to the annular pipe section. The second ends of the plurality of discharge branch pipes are spaced apart in the circumferential direction of the annular pipe section.

6. The fluidized bed reactor according to claim 5, characterized in that The annular pipe section is arranged obliquely, and the collecting pipe section is connected to the lowest end of the annular pipe section and passes through the reactor body.

7. The fluidized bed reactor according to claim 6, characterized in that The angle α between the plane where the axis of the annular pipe section is located and the horizontal plane is between 30° and 45°.

8. The fluidized bed reactor according to any one of claims 5 to 7, characterized in that The first end of the discharge branch pipe is provided with a flared portion, the flared portion is connected to the discharge hole, and the flow area of ​​the flared portion gradually increases in a direction from away from the discharge hole to close to the discharge hole.

9. The fluidized bed reactor according to claim 3, characterized in that: The fluidized bed reactor also includes: A feed pipe, wherein the feed pipe is located at the bottom of the reactor body, a first end of the feed pipe is passed through the gas distribution plate, and the other end of the feed pipe passes through the reactor body and is connected to the outside.

10. The fluidized bed reactor according to claim 9, characterized in that The first end of the feed pipe passes through the bottom end of the gas distribution plate and protrudes from the top surface of the gas distribution plate. The plurality of discharge holes are distributed on the circumferential outside of the feed pipe, and the plurality of exhaust holes are distributed on the circumferential outside of the plurality of discharge holes.

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