A fluidized bed reactor

Abstract

The application provides a fluidized bed reactor. The reactor comprises a plurality of heat exchange units arranged in a circular central array on and around a fluidized bed body, each heat exchange unit comprising a first heat exchange tube bundle and a second heat exchange tube bundle, each of the first and second heat exchange tube bundles being formed by a plurality of heat exchange tubes extending along the height direction of the fluidized bed body and connected in series by U-shaped bends, the inlet end and the outlet end of the first and second heat exchange tube bundles being connected to a feed channel and a discharge channel respectively and located at the upper part of the fluidized bed body, the projection of the first heat exchange tube bundle on a horizontal plane being composed of a first part, a second part, and a third part connecting the end portions on the same side of the first and second parts, the number of heat exchange tubes on the first and second parts being equal and staggered, the inlet end of the first heat exchange tube bundle being located at the end portion on the other side of either of the first and second parts, and the outlet end being located at the end portion on the other side of the other part. The fluidized bed reactor has smaller flow resistance of the material in the bed and more uniform temperature in the bed during reaction.

Description

Technical Field

[0001] This invention belongs to the field of fluidized bed reactor equipment manufacturing technology, specifically relating to an organosilicon fluidized bed reactor. Background Technology

[0002] Fluidized bed reactors are one of the core pieces of equipment in organosilicon production. To ensure the smooth and safe conduct of the reaction, heat exchange tube bundles are usually installed inside the fluidized bed reactor to remove the heat released by the reaction in a timely manner or to maintain the stability of the reaction.

[0003] Traditional heat exchanger tube bundles are often arranged in equilateral or triangular patterns. During material flow, triangular tube arrangements create significant flow resistance and lead to greater tube wear, severely impacting the lifespan of the fluidized bed. Furthermore, as reactors increase in size, the heat exchanger tube bundles need to be continuously lengthened. This results in a gradual increase in temperature differences between different regions of the heat exchanger bundle, especially between the inlet and outlet regions, causing uneven temperature distribution within the fluidized bed and consequently, uneven fluidization of the reactor. Summary of the Invention

[0004] The purpose of this invention is to provide a fluidized bed reactor that has lower material flow resistance and more uniform temperature within the bed during the reaction.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A fluidized bed reactor includes a fluidized bed body, a feed channel for introducing a heat exchange medium, and a discharge channel for discharging the heat exchange medium, all disposed within the fluidized bed body. The fluidized bed reactor further includes multiple heat exchange units arranged in a circular array around the fluidized bed body. Each heat exchange unit includes a first heat exchange tube bundle and a second heat exchange tube bundle. Both the first and second heat exchange tube bundles are formed by multiple heat exchange tubes extending along the height direction of the fluidized bed body connected in series via U-shaped bends. The inlet and outlet ends of the first and second heat exchange tube bundles are connected to the feed channel and the discharge channel, respectively, and are both located at the upper part of the fluidized bed body.

[0007] The projection of the first heat exchange tube bundle onto the horizontal plane consists of a first part, a second part, and a third part connected between the ends of the first and second parts on the same side. The number of heat exchange tubes on the first and second parts is equal and they are staggered. The inlet end of the first heat exchange tube bundle is located at the end on the other side of either the first or second part, and the outlet end is located at the end on the other side of the other part.

[0008] The number of the first heat exchange tube bundle accounts for 50% or more of the total number of heat exchange tube bundles in the heat exchange unit, and the number of heat exchange tubes in the first heat exchange tube bundle and the second heat exchange tube bundle are equal or the difference between them is 2.

[0009] The first and second parts of the first heat exchange tube bundle are arranged in parallel, forming a region for the movement of reactants between them. This region is unobstructed, which makes the material move with less resistance and smoother flow from bottom to top. This allows the material to flow upward to a higher height, and the height of the fluidized bed can be made higher, which is more conducive to the large-scale development of fluidized bed reactors.

[0010] Furthermore, since the heat exchange tube bundle is composed of multiple heat exchange tubes connected in series, the height of a single heat exchange tube is already quite high (up to several meters). The series connection of multiple heat exchange tubes results in a very long heat exchange channel within the bundle. When the heat exchange medium enters the bundle, due to the long channel, a significant temperature difference inevitably exists in different regions, especially between the inlet and outlet areas. By positioning the inlet and outlet ends of the first heat exchange tube bundle on the same side of the first and second sections, the temperatures at the inlet and outlet ends of the first heat exchange tube bundle can compensate for each other, thus maintaining the temperature in the inlet and outlet areas of the first heat exchange tube bundle at a relatively intermediate level. Furthermore, by staggering the heat exchange tubes in the first and second sections, the temperatures between the first and second sections can also compensate for each other and remain at an intermediate level. Therefore, the overall temperature of the first heat exchange tube bundle can be kept uniform, ensuring the temperature uniformity within the bed.

[0011] Due to limitations in the shape and size of the fluidized bed, the heat exchange tubes inside the fluidized bed cannot all be arranged according to the shape of the first heat exchange tube bundle. By setting a second heat exchange tube bundle, it is ensured that the heat exchange tube bundles are evenly distributed in the area of ​​the bed where the heat exchange unit is located, thereby further ensuring the uniformity of the temperature inside the bed.

[0012] In addition, this application uses an array of heat exchange units to make the temperature inside the bed more uniform, thereby further improving the reaction efficiency.

[0013] Preferably, the inlet and outlet ends of the first heat exchange tube bundle are located at the ends of the first part and the second part adjacent to the fluidized bed, respectively.

[0014] Preferably, the first heat exchange tube bundle has 6, 8, or 10 heat exchange tubes.

[0015] In some embodiments, the first heat exchange tube bundle has 8 heat exchange tubes.

[0016] Preferably, the first heat exchange tube bundle has 8 to 12 tubes.

[0017] In some embodiments, the first heat exchange tube bundle has 10 tubes and the second heat exchange tube bundle has 7 tubes.

[0018] Preferably, the projection of the second heat exchange tube bundle onto the horizontal plane includes multiple generally U-shaped first bend regions, with adjacent first bend regions connected and sharing a common edge; and / or the projection of the second heat exchange tube bundle onto the horizontal plane includes multiple generally Z-shaped second bend regions, with adjacent second bend regions connected and sharing a common edge.

[0019] The inlet and outlet ends of the second heat exchange tube bundle are located at both ends of the second heat exchange tube bundle.

[0020] Preferably, the heat exchange tube bundle that does not form the heat exchange tubes in the first bend region and the second bend region is connected to the heat exchange tubes in the adjacent first bend region or second bend region.

[0021] Preferably, the heat exchange unit has 4 to 8 units.

[0022] In some implementations, there are six heat exchange units.

[0023] Preferably, the fluidized bed reactor further includes a central tube located at the center of the fluidized bed body and closed at both ends.

[0024] Preferably, any 2 to 6 inlet ends of the first heat exchange tube bundle and the second heat exchange tube bundle are connected in parallel and connected to the feed channel through a feed branch pipe, and any 2 to 6 outlet ends are connected in parallel and connected to the discharge channel through a discharge branch pipe. The remaining inlet ends and outlet ends of the first heat exchange tube bundle and the second heat exchange tube bundle are connected to the feed channel and the discharge channel through other feed branch pipes and discharge branch pipes, respectively.

[0025] Preferably, the fluidized bed reactor further includes a first hanger connected to the upper part of the first heat exchange tube bundle and the second heat exchange tube bundle, a second hanger located above the first hanger and connected to the fluidized bed body, and a plurality of tie rods connected between the first hanger and the second hanger.

[0026] Preferably, the fluidized bed body has a material inlet and a return port at the bottom and a product outlet at the top. The fluidized bed reactor also includes a separator disposed outside the fluidized bed body, and the feed end and discharge end of the separator are respectively connected to the product outlet and the return port.

[0027] Preferably, the separator has two connected in series, and the discharge end of each separator is connected to the return port.

[0028] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] The present invention uses a first heat exchange tube bundle with a first part and a second part arranged in parallel to form a region for the movement of reactants between the two parts. This region is unobstructed, so that the material moves from bottom to top with less resistance and smoother flow, and the material flows upward to a higher height, which is conducive to the large-scale development of fluidized bed reactors.

[0030] By setting the inlet and outlet ends of the first heat exchange tube bundle on the same side of the first part and the second part, the temperature between the inlet and outlet ends of the first heat exchange tube bundle can compensate for each other, thereby maintaining the temperature of the inlet and outlet regions of the first heat exchange tube bundle at a relatively intermediate temperature. Furthermore, by staggering the heat exchange tubes on the first part and the second part, the temperature between the first part and the second part can also compensate for each other and be maintained at an intermediate temperature. Therefore, the overall temperature of the first heat exchange tube bundle can be kept uniform, ensuring the uniformity of the temperature inside the bed.

[0031] This invention improves reaction efficiency by arranging heat exchange units in an array, resulting in a more uniform temperature within the bed. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the fluidized bed reactor in Example 1 (only part of the heat exchange tube bundle is shown in the figure);

[0033] Figure 2 This is a schematic diagram of the heat exchange device in Example 1;

[0034] Figure 3 This is a schematic diagram of the heat exchange unit in Example 1;

[0035] Figure 4 This is a schematic diagram of the structure of the first heat exchange tube bundle in Example 1;

[0036] Figure 5 This is a schematic diagram of the structure of the second heat exchange tube bundle in Example 1;

[0037] Figure 6 This is another structural schematic diagram of the second heat exchange tube bundle in Example 1;

[0038] Figure 7 This is a schematic diagram of the heat exchange device of Embodiment 1 in which two first heat exchange tube bundles are connected, where B is a schematic diagram of the unfolded state of A, and 1 to 8 in the figure represent the first heat exchange tube to the eighth heat exchange tube in sequence.

[0039] Figure 8 This is a schematic diagram of the heat exchange device of Example 1 in which two second heat exchange tube bundles are connected, where D is a schematic diagram of C in its unfolded state, and 1 to 10 in the figure represent the first heat exchange tube to the tenth heat exchange tube in sequence.

[0040] Figure 9 This is a schematic diagram of one of the second heat exchange tube bundles in the heat exchange device of Embodiment 1, where F is a schematic diagram of E in its unfolded state, and 1 to 10 in the figure represent the first heat exchange tube to the tenth heat exchange tube in sequence.

[0041] Among them, 1. fluidized bed body; 11. feed channel; 12. discharge channel; 13. material inlet; 14. return port; 15. product outlet; 16. first hanger; 17. second hanger; 18. tie rod; 19. support mechanism;

[0042] 2. Heat exchange unit; 21. First heat exchange tube bundle; 211. Inlet end of first heat exchange tube bundle; 212. Outlet end of first heat exchange tube bundle; 213. First section; 214. Second section; 215. Third section; 216. Fluidized zone; 22. Second heat exchange tube bundle; 221. Inlet end of second heat exchange tube bundle; 222. Outlet end of second heat exchange tube bundle; 223. First bend region; 224. Second bend region; 23. Feed branch pipe; 24. Discharge branch pipe;

[0043] 3. Central tube;

[0044] 4. Distributor;

[0045] 5. Coil heating device;

[0046] 61. First separator; 62. Second separator; 63. Return pipe; 631. Jacket vacuum port. Detailed Implementation

[0047] The present invention will be further described below with reference to embodiments, but the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0048] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0049] In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown, such as the product outlet 15 being located above and the material inlet 13 being located below, are merely for the purpose of facilitating the description of embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0052] Example 1

[0053] A fluidized bed reactor, such as Figure 1 As shown, it includes a fluidized bed body 1, a feed channel 11 disposed on the fluidized bed body 1 for introducing heat exchange medium, a discharge channel 12 for discharging heat exchange medium, and a heat exchange device disposed within the fluidized bed body 1.

[0054] like Figure 2 As shown, the heat exchange device includes multiple heat exchange units 2 arranged in a circular array around the center of the fluidized bed 1, and a central tube 3 located at the center of the fluidized bed 1 and closed at both ends. The array arrangement of the heat exchange units 2 makes the temperature within the bed more uniform, thereby improving reaction efficiency. Preferably, there are 4 to 8 heat exchange units 2; in this embodiment, there are 6 heat exchange units 2. The following detailed description uses one of the heat exchange units 2 as an example.

[0055] like Figure 3As shown, the heat exchange unit 2 includes a first heat exchange tube bundle 21, which is formed by multiple heat exchange tubes extending along the height direction (i.e., the vertical direction) of the fluidized bed 1 connected in series via U-shaped bends. The inlet end 211 of the first heat exchange tube bundle is connected to the feed channel 11, and the outlet end is connected to the discharge channel 12. The heat exchange medium enters from the inlet end 211 of the first heat exchange tube bundle and flows out from the outlet end 212 of the first heat exchange tube bundle. Both the inlet end 211 and the outlet end 212 of the first heat exchange tube bundle are located at the upper part of the fluidized bed 1. Figure 4 As shown, the projection of the first heat exchange tube bundle 21 onto the horizontal plane consists of a first part 213, a second part 214 that are parallel to each other, and a third part 215 connecting the ends of the first part 213 and the second part 214 on the same side. The number of heat exchange tubes on the first part 213 and the second part 214 are equal and staggered. The inlet end 211 of the first heat exchange tube bundle is located at the end on the other side of either the first part 213 or the second part 214, and the outlet end 212 of the first heat exchange tube bundle is located at the end on the other side of the other part. Preferably, the inlet end and the outlet end of the first heat exchange tube bundle 21 are located at the ends of the first part 213 and the second part 214 that are adjacent to the fluidized bed 1, respectively.

[0056] Typically, heat exchange tubes are several meters high, and heat exchange tube bundles consist of multiple heat exchange tubes connected in series. Therefore, the heat exchange channels of the heat exchange tube bundle are very long. When the heat exchange medium is introduced into the heat exchange tube bundle, the long heat exchange channels inevitably cause temperature differences in different areas of the heat exchange tube bundle, especially the temperature difference between the inlet and outlet ends of the heat exchange tube bundle. The inventors have addressed this by setting the inlet end 211 and the outlet end of the first heat exchange tube bundle on the same side. The inlet end 211, which has a lower temperature, provides temperature compensation to the outlet end 212, which has a higher temperature, thereby maintaining the temperature between the inlet end 211 and the outlet end 212 of the first heat exchange tube bundle at an intermediate temperature. Furthermore, by making the first part 213 and the second part 214 parallel and staggering the heat exchange tubes on them, the first part 213, which has a lower temperature, and the second part 214, which has a higher temperature, also compensate for each other and maintain an intermediate temperature. This ensures that the overall temperature of the first heat exchange tube bundle 21 remains uniform, thereby guaranteeing the temperature uniformity within the bed. Furthermore, this arrangement between the first part 213 and the second part 214 of the first heat exchange tube bundle 21 can also form a fluidized zone 216 for the movement of reactants. This fluidized zone 216 is unobstructed, which makes the material move from bottom to top with less resistance and smoother flow. The material can flow upward to a higher height, which is beneficial for the large-scale development of fluidized bed reactors.

[0057] Preferably, the first heat exchange tube bundle 21 has 6, 8, or 10 heat exchange tubes. In this embodiment, the first heat exchange tube bundle 21 has 8 heat exchange tubes, that is, 4 heat exchange tubes are located in the first part 213. The number of heat exchange tubes in each first heat exchange tube bundle 21 is equal.

[0058] Due to limitations in the shape and size of the fluidized bed 1, the heat exchange tube bundles cannot all be arranged according to the shape of the first heat exchange tube bundle 21. Therefore, the heat exchange unit 2 of this application also includes a second heat exchange tube bundle 22. To further improve the temperature uniformity within the bed, the number of the first heat exchange tube bundle 21 accounts for 50% or more of the total number of heat exchange tube bundles in the heat exchange unit 2. In this embodiment, the number of first heat exchange tube bundles 21 is 10, and the number of second heat exchange tube bundles 22 is 7. The second heat exchange tube bundle 22 will be further described below.

[0059] like Figure 3 , Figure 5 and Figure 6 As shown, the second heat exchange tube bundle 22 is composed of multiple heat exchange tubes extending along the height direction (i.e., vertical direction) of the fluidized bed 1, connected in series via U-shaped bends. The inlet end 221 and outlet end 222 of the second heat exchange tube bundle are connected to the feed channel 11 and the discharge channel 12, respectively. The heat exchange medium flows in from the inlet end 221 and flows out from the outlet end 222. Both the inlet end 221 and the outlet end of the second heat exchange tube bundle are located at the upper part of the fluidized bed 1. The projection of the second heat exchange tube bundle 22 onto the horizontal plane includes multiple generally U-shaped first bending regions 223. Two adjacent first bending regions 223 are connected and have a common edge (e.g., ...). Figure 5 (as shown); and / or the projection of the second heat exchange tube bundle 22 onto the horizontal plane includes a plurality of generally Z-shaped second bend regions 224, adjacent second bend regions 224 being connected and having a common edge (as shown). Figure 6 (As shown). The U-shaped bend region offers less resistance to material fluidization than the Z-shaped bend region. Therefore, the projection of the second heat exchange tube bundle 22 on the horizontal plane is preferably arranged in a U-shaped first bend region 223.

[0060] The heat exchange tubes in the second heat exchange tube bundle 22 that do not form the first bend region 223 or the second bend region 224 are connected to the heat exchange tubes on the adjacent first bend region 223 or the second bend region 224. The inlet end 221 and the outlet end 222 of the second heat exchange tube bundle are located at both ends of the second heat exchange tube bundle 22. The arrangement of the multiple second heat exchange tube bundles 22 on the heat exchange unit 2 can be the same or different, depending on the actual number and layout of the heat exchange tubes in the heat exchange unit 2.

[0061] Preferably, the number of heat exchange tubes in the second heat exchange tube bundle 22 and the first heat exchange tube bundle 21 are equal, or the difference between them is 2. When the difference is 2, the number of heat exchange tubes in the second heat exchange tube bundle 22 can be 2 fewer than that in the first heat exchange tube bundle 21, or the number of heat exchange tubes in the second heat exchange tube bundle 22 can be 2 more than that in the first heat exchange tube bundle 21. In this embodiment, the number of heat exchange tubes in the second heat exchange tube bundle 22 is 2 more than that in the first heat exchange tube bundle 21. By ensuring that the difference in the number of the first and second heat exchange tube bundles 22 is not greater than 2, the uniformity of the temperature inside the bed is further guaranteed.

[0062] In the prior art, each heat exchanger tube bundle has an inlet branch pipe 23 and an outlet branch pipe 24. The inlets of these inlet branch pipes 23 and the outlets of the outlet branch pipes 24 need to be connected to the feed and discharge pipes via the fluidized bed 1. Therefore, a large number of inlets and outlets converge on the fluidized bed 1. Because the inlet and outlet branch pipes 24 are too dense, with insufficient spacing and a complex, interwoven structure, there is no space at the top of the fluidized bed 1 for later maintenance, making subsequent equipment repair impossible. The inventors have significantly reduced the number of inlet and outlet branch pipes 24 by converging multiple inlet or outlet ends onto a single inlet branch pipe 23 or outlet branch pipe 24, thus freeing up extra space for convenient subsequent maintenance.

[0063] Specifically, any 2 to 6 inlet ends of the first heat exchange tube bundle 21 and the second heat exchange tube bundle 22 are connected in parallel and connected to the feed channel 11 through a feed branch pipe 23. Any 2 to 6 outlet ends are connected in parallel and connected to the discharge channel 12 through a discharge branch pipe 24. The remaining inlet and outlet ends of the first heat exchange tube bundle 21 and the second heat exchange tube bundle 22 are connected to the feed channel 11 and the discharge channel 12 through other feed branch pipes 23 and discharge branch pipes 24, respectively.

[0064] In this embodiment, the inlet ends (1a2a3a4a5a) of the first to fifth groups of heat exchange tube bundles in heat exchange unit 2 are arranged in parallel and connected to the feed channel 11 through a feed branch pipe 23. The inlet ends (6a7a) of the sixth and seventh groups of heat exchange tube bundles are arranged in parallel and connected to the feed channel 11 through a feed branch pipe 23. The inlet ends (8a9a) of the eighth and ninth groups of heat exchange tube bundles are arranged in parallel and connected to the feed channel 11 through a feed branch pipe 23. The inlet end (10a) of the tenth group of heat exchange tube bundles is connected to the feed channel 11 through a feed branch pipe 23. The inlet ends (11a16a) of the eleventh and sixteenth groups of heat exchange tube bundles are arranged in parallel and connected to the feed channel 11 through a feed branch pipe 23. The inlet ends (12a13a) of the twelfth and thirteenth groups of heat exchange tube bundles are arranged in parallel and connected to the feed channel 11 through a feed branch pipe 23 (see details). Figure 7The inlet end (14a) of the fourteenth heat exchanger tube bundle is connected to the feed channel 11 via a separate feed branch pipe 23. The inlet ends (15a and 17a) of the fifteenth and seventeenth heat exchanger tube bundles are arranged side by side and connected to the feed channel 11 via a feed branch pipe 23 (see details). Figure 8 The outlet ends (1b2b) of the first and second groups of heat exchange tube bundles are arranged in parallel and connected to the discharge channel 12 via a discharge branch pipe 24. The outlet ends (3b5b6b7b) of the third, fifth to seventh groups of heat exchange tube bundles are arranged in parallel and connected to the discharge channel 12 via a discharge branch pipe 24. The outlet ends (8b9b10b) of the eighth to tenth groups of heat exchange tube bundles are arranged in parallel and connected to the discharge channel 12 via a discharge branch pipe 24. The outlet ends (4b11b16b) of the fourth, eleventh and sixteenth groups of heat exchange tube bundles are arranged in parallel and connected to the discharge channel 12 via a discharge branch pipe 24. The outlet ends (12b13b) of the twelfth and thirteenth groups of heat exchange tube bundles are arranged in parallel and connected to the discharge channel 12 via a discharge branch pipe 24 (see details). Figure 7 The outlet end (14b) of the fourteenth heat exchanger tube bundle is connected to the discharge channel 12 via a separate discharge branch pipe 24. The outlet ends (15b and 17b) of the fifteenth and seventeenth heat exchanger tube bundles are connected to the discharge channel 12 via separate discharge branch pipes 24 (see details). Figure 8 Among them, the first to third, fifth to ninth, twelfth and thirteenth heat exchange tube bundles are the first heat exchange tube bundle 21, and the remaining heat exchange tube bundles are the second heat exchange tube bundle 22.

[0065] See Figure 1 The fluidized bed reactor also includes a first hanger 16 connected to the upper part of the first heat exchange tube bundle 21 and the second heat exchange tube bundle 22, a second hanger 17 located above the first hanger 16 and connected to the fluidized bed body 1, and a plurality of tie rods 18 connected between the first hanger 16 and the second hanger 17. By setting the first and second hangers 17 and the tie rods 18, the inventors have made the fixation of the heat exchange device more stable.

[0066] The fluidized bed reactor also includes multiple support structures 19 arranged along the axial direction of the fluidized bed body 1. Since the heat exchange tubes constituting the heat exchange tube bundle have small diameters and are long, a certain number of heat exchange tube bundle support structures 19 need to be installed along the axial direction of the fluidized bed reactor to ensure the stability of the heat exchange tubes, prevent vibration caused by decreased tube stiffness under high temperature and high gas velocity conditions leading to fatigue damage, and limit the radial sway of the heat exchange tubes along the fluidized bed reactor. The specific shape of the support structure can be referred to in the prior art, and this application does not impose any limitations.

[0067] The fluidized bed 1 has a material inlet 13 and a return port 14 at its bottom, and a product outlet 15 at its top. The fluidized bed reactor also includes a separator located outside the fluidized bed 1. The feed end and discharge end of the separator are connected to the product outlet 15 and the return port 14, respectively. Preferably, there are two separators connected in series (the two separators are the first separator 61 and the second separator 62). The discharge end of each separator is connected to the return port 14 through a jacketed return pipe 63. The jacket of the return pipe 63 has a jacketed vacuum port 631. By placing the separator and the return pipe 63 outside the fluidized bed 1, compared to a design where the return pipe 63 is located inside the fluidized bed 1, the effective volume of the reactor is larger, which is beneficial to improving the reaction efficiency.

[0068] The fluidized bed 1 is also provided with a distributor 4, which is located below the heat exchange device. The outer wall of the fluidized bed 1 is also provided with a coil heating device 5. The fluidized bed 1, the distributor 4 and the coil heating device 5 can refer to the prior art, and this application does not make specific limitations.

[0069] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A fluidized bed reactor, comprising a fluidized bed body, a feed channel disposed within the fluidized bed body for introducing a heat exchange medium, and a discharge channel for discharging the heat exchange medium, characterized in that: The fluidized bed reactor further includes multiple heat exchange units arranged in a circular array around the fluidized bed body. Each heat exchange unit includes a first heat exchange tube bundle and a second heat exchange tube bundle. Both the first and second heat exchange tube bundles are composed of multiple heat exchange tubes extending along the height direction of the fluidized bed body connected in series via U-shaped bends. The inlet and outlet ends of the first and second heat exchange tube bundles are connected to the feed channel and the discharge channel, respectively, and are both located at the upper part of the fluidized bed body. The projection of the first heat exchange tube bundle on the horizontal plane consists of a first part, a second part, and a third part connected between the ends of the first part and the second part on the same side. The number of heat exchange tubes on the first part and the second part are equal and staggered. The inlet end of the first heat exchange tube bundle is located at the end of the other side of either the first part or the second part, and the outlet end is located at the end of the other side of the first part. The inlet end and the outlet end of the first heat exchange tube bundle are respectively located at the ends of the first part and the second part that are adjacent to the fluidized bed. The projection of the second heat exchange tube bundle on the horizontal plane includes multiple generally U-shaped first bend regions, with two adjacent first bend regions connected and having a common edge; and / or the projection of the second heat exchange tube bundle on the horizontal plane includes multiple generally Z-shaped second bend regions, with two adjacent second bend regions connected and having a common edge, and the inlet end and outlet end of the second heat exchange tube bundle are located at both ends of the second heat exchange tube bundle. The number of the first heat exchange tube bundle accounts for 50% or more of the total number of heat exchange tube bundles in the heat exchange unit, and the number of heat exchange tubes in the first heat exchange tube bundle and the second heat exchange tube bundle are equal or the difference between them is 2.

2. The fluidized bed reactor according to claim 1, characterized in that: The first heat exchange tube bundle has 6, 8 or 10 heat exchange tubes.

3. The fluidized bed reactor according to claim 1, characterized in that: The first heat exchange tube bundle has 8 to 12 tubes.

4. The fluidized bed reactor according to claim 1, characterized in that: The heat exchange tube bundle that does not form the heat exchange tubes of the first and second bend regions is connected to the heat exchange tubes of the adjacent first or second bend regions.

5. The fluidized bed reactor according to claim 1, characterized in that: The heat exchange unit has 4 to 8 units.

6. The fluidized bed reactor according to claim 1, characterized in that: The first heat exchange tube bundle and the second heat exchange tube bundle have any 2 to 6 inlet ends connected in parallel and connected to the feed channel through a feed branch pipe. Any 2 to 6 outlet ends are arranged in parallel and connected to the discharge channel through a discharge branch pipe. The remaining inlet and outlet ends of the first heat exchange tube bundle and the second heat exchange tube bundle are connected to the feed channel and the discharge channel through other feed branch pipes and discharge branch pipes, respectively.

7. The fluidized bed reactor according to claim 1, characterized in that: The fluidized bed reactor further includes a first hanger connected to the upper part of the first heat exchange tube bundle and the second heat exchange tube bundle, a second hanger located above the first hanger and connected to the fluidized bed body, and a plurality of tie rods connected between the first hanger and the second hanger.

8. The fluidized bed reactor according to claim 1, characterized in that: The fluidized bed has a material inlet and a return port at the bottom and a product outlet at the top. The fluidized bed reactor also includes a separator located outside the fluidized bed. The feed end and discharge end of the separator are connected to the product outlet and the return port, respectively.

9. The fluidized bed reactor according to claim 8, characterized in that: The separator has two connected in series, and the discharge end of each separator is connected to the return port.

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