High flow grid, grid arrangement and fluidized bed

Abstract

The application discloses a high-flow grid, a grid arrangement structure and a fluidized bed. The high-flow grid comprises a plurality of sleeves, a plurality of webs and a support ring. The plurality of sleeves are divided into a plurality of rows. The plurality of sleeves in each row are sequentially connected along the arrangement direction through the webs to form a support chain for fixing a heat exchange pipe. The support ring is used for connecting two ends of all the support chains. Between at least one pair of adjacent support chains, at least one pair of corresponding sleeves are not connected through the webs to form a high-flow area. The grid arrangement structure adopts at least one high-flow grid. The fluidized bed comprises the grid arrangement structure. Compared with the traditional mode, the technical scheme of the application can effectively reduce or avoid the blockage of the high-flow grid, thereby improving the production efficiency and production quality, while ensuring the structural strength of the high-flow grid by setting the high-flow area to increase the local cross-sectional flow area of the high-flow grid.

Description

Technical Field

[0001] This application relates to the field of organosilicon production technology, and in particular to a high-flow grid, a grid arrangement structure, and a fluidized bed. Background Technology

[0002] The synthesis of organosilicon monomers involves reacting silicon powder of a certain particle size with gaseous chloromethane in a fluidized bed reactor under the action of a copper catalyst to produce methylchlorosilane. The gaseous methylchlorosilane and unreacted chloromethane, carrying silicon powder, are introduced into a cyclone system. After most of the silicon powder is removed by the cyclone system, the mixture enters a scrubbing tower where residual silicon powder is removed by methylchlorosilane washing. The clean reaction gas is then condensed and further separated to recover unreacted chloromethane, while the methylchlorosilane is sent to downstream processing.

[0003] In the synthesis of organosilicon monomers, the fluidized bed reactor is the core reactor, and its structure has a significant impact on the reaction conversion rate and the selectivity of the main product. Currently, the mainstream reactor internal heat exchange tubes are U-shaped tubes, fixed by approximately 4-6 layers of grids. Each heat exchange tube at the grid is encased in a sleeve, and each sleeve is connected by four ribs. During operation, it has been found that the dense grid leads to high resistance for silicon powder during operation, easily causing blockages. Blockages affect the fluidization state, resulting in reduced production capacity and decreased selectivity of the main product. Utility Model Content

[0004] One objective of this application is to provide a high-flow grid that can solve at least one of the defects in the aforementioned background art.

[0005] Another objective of this application is to provide a grid arrangement structure that can solve at least one of the defects in the aforementioned background art.

[0006] Another object of this application is to provide a fluidized bed that can solve at least one of the defects in the above-mentioned background art.

[0007] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a high-flow grid, comprising multiple sleeves, multiple stiffeners, and support rings; all the sleeves are divided into multiple rows, and the multiple sleeves in each row are sequentially connected along the arrangement direction by the stiffeners to form a support chain for fixing the heat exchange tubes, and the support rings are used to connect the two ends of all the support chains; between at least one pair of adjacent support chains, at least one pair of sleeves in corresponding positions are not connected by the stiffeners to form a high-flow area.

[0008] Preferably, there are multiple high-flow areas.

[0009] Preferably, the high-flow area is formed between multiple pairs of adjacent support chains.

[0010] Preferably, a single high-flow area is formed between each pair of adjacent support chains.

[0011] Preferably, multiple spaced high-flow areas are formed between each pair of adjacent support chains.

[0012] Preferably, a single high-flow area is formed between at least one pair of adjacent support chains, and a plurality of spaced high-flow areas are formed between at least one pair of adjacent support chains.

[0013] Preferably, at least one of the high-flow areas corresponds to multiple pairs of sleeves that are in consecutive positions and are not connected by the stiffeners.

[0014] Preferably, for the multiple high-flow regions formed between adjacent support chains, the number of sleeves not connected by the ribs corresponding to each high-flow region is the same.

[0015] Preferably, for the multiple high-flow regions formed between adjacent support chains, the number of sleeves not connected by the ribs corresponding to each high-flow region is not exactly the same.

[0016] Preferably, all of the high-flow areas are evenly distributed across the entire cross-section of the high-flow grid.

[0017] Preferably, all of the high-flow areas are concentrated in the central region of the cross-section of the high-flow grid.

[0018] Preferably, along the arrangement direction perpendicular to the support chains, the plurality of high-flow regions formed between each pair of adjacent support chains remain continuous.

[0019] Preferably, along the arrangement direction perpendicular to the support chains, among the plurality of high flow regions formed between each pair of adjacent support chains, at least one pair of adjacent high flow regions is spaced apart, and the spacing distance is at least the distance between a pair of adjacent support chains.

[0020] Preferably, the high-flow area is formed between all adjacent support chains.

[0021] Preferably, adjacent support chains are completely spaced apart to form the high-flow area.

[0022] A grid arrangement structure includes a plurality of grids spaced apart along the length of a heat exchange tube; wherein at least one of the grids located in the lower layer of the heat exchange tube is a high-flow grid as described above.

[0023] Preferably, the plurality of the grids are high-flow grids; the plurality of high-flow grids are arranged sequentially from bottom to top on the heat exchange tube.

[0024] Preferably, the support chains are arranged in a cross-position between adjacent high-flow grids.

[0025] Preferably, the cross angle of the support chains between adjacent high-flow grids is 30° to 90°.

[0026] Preferably, in three consecutive high-flow grids, the support chains of the first and last high-flow grids are parallel.

[0027] Preferably, the number of high-flow-rate grilles used is 30% to 50% of all the grilles.

[0028] A fluidized bed comprising the aforementioned grid arrangement structure.

[0029] Compared with the prior art, the beneficial effects of this application are as follows: Compared with traditional methods, the technical solution of this application, while ensuring the structural strength of the high-flow grid, increases the local cross-sectional flow area of ​​the high-flow grid by setting a high-flow zone, thereby effectively reducing or avoiding clogging of the high-flow grid and improving production efficiency and quality. Attached Figure Description

[0030] Figure 1 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 1 .

[0031] Figure 2 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 2 .

[0032] Figure 3 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 3 .

[0033] Figure 4 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 4 .

[0034] Figure 5 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 5 .

[0035] Figure 6 This application provides a structural diagram illustrating the high-flow area formed by the high-flow grille. Figure 6 .

[0036] Figure 7This is a partial structural diagram of the grid arrangement structure in this application.

[0037] Figure 8 This is a schematic projection of adjacent high-flow grids along the axial direction in this application.

[0038] In the figure: heat exchange tube 100, high flow grid 2, support ring 21, sleeve 22, stiffener 23, high flow area 200, support chain 210. Detailed Implementation

[0039] The present application will now be further described in conjunction with specific embodiments. It should be noted that, in the description of this specification, the use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0040] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 should not be construed as limiting the specific protection scope of this application.

[0041] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0045] One aspect of this application provides a high-flow grille, such as Figures 1 to 6 As shown, one preferred embodiment includes multiple sleeves 22, multiple stiffeners 23, and a support ring 21. During the installation of the high-flow-rate grid 2, the high-flow-rate grid 2 can be fitted onto the corresponding heat exchange tubes 100 using multiple sleeves 22 corresponding to the number of heat exchange tubes 100, thus supporting and fixing the heat exchange tubes 100. Since the heat exchange tubes 100 are generally evenly distributed, the multiple sleeves 22 are also evenly distributed. Therefore, all the sleeves 22 can be divided into multiple rows according to a given direction. The multiple sleeves 22 in each row are sequentially connected along the arrangement direction by stiffeners 23 to form a support chain 210 that fixes part of the heat exchange tubes 100. The distribution position of one of the support chains 210 can be referenced from 1 to 21. Figure 6 The dashed box indicates the location. Support ring 21 is used to connect both ends of all support chains 210 to further strengthen the connection between all support chains 210. Between at least one pair of adjacent support chains 210, at least one pair of corresponding sleeves 22 are not connected by stiffeners 23 to form a high-flow area 200. The formed high-flow area 200 can... Figures 1 to 6 The high-flow area 200 is represented by a thick dashed line box. The high-flow area 200 can increase the cross-sectional flow area of ​​the high-flow grid 2, thereby reducing or preventing clogging of the high-flow grid 2 and improving production efficiency and quality.

[0046] It is understandable that the specific number of sleeves 22 depends on the number of heat exchange tubes 100, and the number of sleeves 22 in each row depends on the arrangement of the heat exchange tubes 100. If the heat exchange tubes 100 are arranged in a rectangular array, then the number of sleeves 22 in each row is the same. If the heat exchange tubes 100 are arranged in a ring array, then the number of sleeves 22 in each row is not exactly equal, showing an arrangement where the number gradually increases from both sides to the middle. Therefore, the specific arrangement of the sleeves 22 can be determined according to the arrangement of the heat exchange tubes 100 in actual use. For the convenience of the following description, this application will take a ring array arrangement of heat exchange tubes 100 as an example.

[0047] It should be understood that in traditional grids, a single sleeve 22 needs to be connected to four stiffeners 23. This results in the entire grid cross-section forming multiple rhomboid or oriented flow areas. Each flow area corresponds to four stiffeners 23 and four sleeves 22. The four sleeves 22 can be considered as the corner points of the flow area, and the four stiffeners 23 can be considered as the side lengths of the flow area. During the production of organosilicon monomers, when the mixed airflow containing silicon powder passes through the fluidized bed, the stiffeners 23 obstruct the flow of the mixed airflow, thereby increasing the residence time of silicon powder at the grid position and causing coking of the silicon powder at the grid position. In the technical solution of this application, based on the formation of the high flow area 200, the number of stiffeners 23 can be reduced. This makes the cross-sectional flow area of ​​the high flow grid 2 of this application larger than that of the traditional grid, thereby reducing the flow resistance to the mixed airflow and shortening the residence time of silicon powder at the high flow grid 2 position, thus improving the coking situation of silicon powder at the grid position. That is, while reducing the risk of blockage of the high flow grid 2, it can also improve the fluidized bed capacity and product quality.

[0048] Meanwhile, as the mixed airflow passes through the flow area of ​​the grid, coking of silicon powder in the mixed airflow occurs at the position of the rib 23. As the reaction time continues, the volume of the coking area on the rib 23 will gradually increase, eventually causing partial or complete blockage of the flow area. For ease of understanding, a detailed description using specific parameters will be provided below.

[0049] Specifically, taking a single flow area of ​​a traditional grille as an example, assuming the flow area of ​​the traditional grille is a square with a side length of 'a', then the area of ​​a single flow area is 'a'. 2 Assuming that after the coking zone is formed by the stiffener 23, the length by which the coking zone intrudes into the flow area is b; then the flow area S1 after the flow area is partially blocked by the coking zone is S1 = (a - 2b). 2 .

[0050] In the technical solution of this application, taking the minimum area of ​​the high flow region 200 as an example, that is, the high flow region 200 is formed between adjacent support chains 210 by a pair of corresponding sleeves 22 without being connected by stiffeners 23. Then, the high flow region 200 can be regarded as a rectangular area with a length of 2a and a width; after the coking zone is formed by the stiffeners 23, the flow area S2 after the high flow region 200 in the technical solution of this application is partially blocked by the coking zone is S2 = 2(ab)(a-2b).

[0051] If the value of b is 0.1a, the ratio of the circulation areas S2 and S1 is 2.25; if the value of b is 0.2a, the ratio of the circulation areas S2 and S1 is 2.67; if the value of b is 0.3a, the ratio of the circulation areas S2 and S1 is 3.5; if the value of b is 0.4a, the ratio of the circulation areas S2 and S1 is 6.

[0052] As can be seen from the calculation process of the specific values ​​described above, even if the minimum high-flow area 200 is used in the technical solution of this application, its flow area is still much larger than that of the flow area of ​​a traditional grid when a coking zone is generated. That is, the high-flow area 200 used in the technical solution of this application can effectively reduce the probability of the grid being blocked.

[0053] Meanwhile, as shown in the above calculations, when the value of b is greater than or equal to 0.5a, the traditional grid has already become clogged. Theoretically, the high-flow area 200 formed by the technical solution of this application will also be clogged. However, since the length of part of the side of the high-flow area 200 formed by the technical solution of this application has increased, the wind-receiving area of ​​the coking zone that invades the high-flow area 200 will also increase, that is, the impact force of the mixed airflow on the coking zone will increase. This will further increase the probability of the coking zone falling off, so that when the length b of the coking zone accumulated on the longer side of the high-flow area 200 in the technical solution of this application reaches 0.3a~0.4a, it will detach, so that the high-flow area 200 will always remain open. That is, the high-flow grid 2 of this application can completely avoid clogging.

[0054] As can be understood from the foregoing analysis, to ensure that the high-flow grid 2 of this application is not blocked, the number of high-flow regions 200 is at least one; however, to ensure the normal synthesis of organosilicon monomers, there are certain requirements for the flow rate of the mixed airflow, so the number of high-flow regions 200 formed in the high-flow grid 2 is preferably multiple. It should be noted that the formation location of multiple high-flow regions 200 can be between a pair of adjacent support chains 210 or between multiple pairs of adjacent support chains 210. To further ensure the flow effect of the high-flow grid 2 on the mixed airflow, in this embodiment, it is preferable to form multiple high-flow regions 200 between multiple pairs of adjacent support chains 210.

[0055] It is important to understand that there are two main forms in which multiple high-flow regions 200 are formed between multiple pairs of adjacent support chains 210: one is that no high-flow region 200 is formed between at least one pair of adjacent support chains 210, and the other is that high-flow regions 200 are formed between all adjacent support chains 210. For ease of understanding, the two forms will be described in detail below through two embodiments.

[0056] Example 1: In this embodiment, as Figures 1 to 5 As shown, there is at least one pair of adjacent support chains 210 where no high-flow area 200 is formed. For a single pair of adjacent support chains 210 where a high-flow area 200 is formed, the number of high-flow areas 200 formed can be one or more; for ease of understanding, three specific setup methods will be explained in detail below.

[0057] Setting method 1: As shown in the example Figure 1 and Figure 5 As shown, in the multiple pairs of adjacent support chains 210 that form multiple high flow regions 200, each pair of adjacent support chains 210 forms a single high flow region 200.

[0058] It is understandable that a single high-flow area 200 formed between a pair of adjacent support chains 210 can correspond to only one pair of sleeves 22 not connected by stiffeners 23, or it can correspond to multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23. That is, a single high-flow area 200 formed between a pair of adjacent support chains 210 can have a relatively small area or a relatively large area. If the high-flow area 200 is formed by only one pair of sleeves 22 not connected by stiffeners 23, then the high-flow boundary area formed by multiple high-flow areas 200 on the entire high-flow grid 2 is relatively narrow. If the high-flow area 200 is formed by multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23, then the high-flow boundary area formed by multiple high-flow areas 200 on the entire high-flow grid 2 can be relatively wide. Therefore, in this example, the preferred form for the high-flow area 200 is the formation of multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23.

[0059] Setting method two: (e.g.) Figure 2 As shown, in the multiple pairs of adjacent support chains 210 that form multiple high flow regions 200, multiple spaced high flow regions 200 are formed between each pair of adjacent support chains 210.

[0060] It is understandable that for multiple high-flow areas 200 formed between a single pair of adjacent support chains 210, the number of sleeves 22 not connected by the stiffener 23 corresponding to each high-flow area 200 may be the same or not completely the same. More specifically, for multiple high-flow areas 200, they may correspond to only one pair of sleeves 22 not connected by the stiffener 23, or they may correspond to multiple pairs of sleeves 22 that are consecutively connected by the stiffener 23. Alternatively, at least one high-flow area 200 may correspond to only one pair of sleeves 22 not connected by the stiffener 23, or at least one high-flow area 200 may correspond to multiple pairs of sleeves 22 that are consecutively connected by the stiffener 23. The specific choice can be made according to the actual needs of those skilled in the art. For ease of understanding, a specific example is provided below.

[0061] Specifically, assume that three high-flow areas 200 are formed between a single pair of adjacent support chains 210; these three high-flow areas 200 can each correspond to one or two pairs of sleeves 22 that are not connected by stiffeners 23; or two of the high-flow areas 200 can each correspond to two pairs of sleeves 22 that are not connected by stiffeners 23, and the remaining high-flow area 200 corresponds to one pair of sleeves 22 that are not connected by stiffeners 23.

[0062] Setting method three: (e.g.) Figure 3 and Figure 4As shown, among the multiple pairs of adjacent support chains 210 forming multiple high flow regions 200, at least one pair of adjacent support chains 210 forms a single high flow region 200, and at least one pair of adjacent support chains 210 forms multiple spaced high flow regions 200.

[0063] It is understandable that a single high-flow area 200 formed between a pair of adjacent support chains 210 can correspond to only one pair of sleeves 22 not connected by stiffeners 23, or it can correspond to multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23. For multiple high-flow areas 200 formed between a pair of adjacent support chains 210, the number of pairs of sleeves 22 not connected by stiffeners 23 corresponding to each high-flow area 200 can be the same or not completely the same.

[0064] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the entire high-flow area 200 can be evenly distributed across the cross-section of the high-flow grid 2, thus ensuring that the high-flow grid 2 has strong flow performance at any local location.

[0065] It's important to understand that in the production design for organosilicon monomer synthesis, it's often necessary to ensure that the flow rate of the mixed gas stream used in the reaction is uniform as it passes through the fluidized bed. However, in actual operation, due to various factors, the flow rate of the mixed gas stream may exhibit a tendency to concentrate. Therefore, to ensure smooth flow of the mixed gas stream under this tendency, such as... Figure 2 and Figure 5 As shown, all the high flow areas 200 can be concentrated in the middle area of ​​the cross section of the high flow grid 2.

[0066] In this embodiment, as Figure 2 and Figure 5 As shown, along the arrangement direction perpendicular to the support chain 210, the multiple high flow regions 200 formed between each pair of adjacent support chains 210 can remain continuous; this can improve the concentration effect of the high flow regions 200.

[0067] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, along the arrangement direction perpendicular to the support chain 210, among the multiple high flow regions 200 formed between each pair of adjacent support chains 210, at least one pair of adjacent high flow regions 200 is spaced apart, and the spacing distance is at least the distance between a pair of adjacent support chains 210.

[0068] It is understandable that the local arrangement of the high-flow area 200 in this embodiment along the direction perpendicular to the support chain 210 can be mainly divided into two types. The first type involves spacing the multiple high-flow areas 200 formed between adjacent support chains 210 along the direction perpendicular to the support chain 210, which effectively improves the uniform distribution of the high-flow areas 200. The second type involves the high-flow area 200 located in the central region of the high-flow grille 2 being continuous, while the high-flow areas 200 located on the sides of the high-flow grille 2 being spaced out, thus accommodating both mixed airflow conditions.

[0069] Example 2: In this embodiment, as Figure 6 As shown, a high flow area 200 is formed between all adjacent support chains 210; the high flow area 200 formed between each pair of adjacent support chains 210 can be one or more.

[0070] It is understandable that a single high-flow area 200 formed between a pair of adjacent support chains 210 can correspond to only one pair of sleeves 22 not connected by stiffeners 23, or it can correspond to multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23. If the high-flow area 200 is formed by only one pair of sleeves 22 in corresponding positions not connected by stiffeners 23, then the high-flow boundary area formed by multiple high-flow areas 200 on the entire high-flow grid 2 is relatively narrow. If the high-flow area 200 is formed by multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23, then the high-flow boundary area formed by multiple high-flow areas 200 on the entire high-flow grid 2 can be relatively wide. Therefore, in this example, the preferred method for forming the high-flow area 200 is to use multiple pairs of sleeves 22 in consecutive positions not connected by stiffeners 23; one optimal method is as follows: Figure 6 As shown, adjacent support chains 210 are completely spaced apart to form a high-flow area 200.

[0071] It should be understood that in traditional grid structures, due to the small area of ​​a single flow zone and the relatively dense ribs 23, the mixed airflow is easily disturbed when passing through the traditional grid. Therefore, for traditional grids, the axial length of the ribs 23 and the sleeves 22 needs to be relatively long to suppress disturbances when the mixed airflow passes through the flow zone. In the technical solution of this application, the number of ribs 23 is reduced, and their relative density is decreased; therefore, the disturbance generated by the mixed airflow when passing through the high-flow grid 2 of this application is smaller. Thus, the axial length of the sleeves 22 and ribs 23 in this application can be shortened. For example, the axial length of the sleeves 22 and ribs 23 in a traditional grid can be shortened from 20cm to 8~10cm.

[0072] Another aspect of this application provides a grid arrangement structure, such as Figure 7 As shown, one preferred embodiment includes a plurality of grilles spaced apart along the length of the heat exchange tube 100; wherein at least one grille located on the lower layer of the heat exchange tube 100 adopts the high-flow grille 2 described above.

[0073] It is understandable that during the synthesis of organosilicon monomers, the flow direction of the mixed gas flow used for the reaction is from bottom to top. Therefore, as the mixed gas flow rises, the grid located below the heat exchange tube 100 will be the first to come into contact with the mixed gas flow. As is common knowledge to those skilled in the art, the grid located below the heat exchange tube 100 accumulates the most coking zone; that is, the grid below the heat exchange tube 100 is more prone to clogging. Therefore, in the technical solution of this application, the aforementioned high-flow-rate grid 2 can be applied to the lower layer of the heat exchange tube 100, thereby ensuring that the mixed gas flow remains unobstructed throughout the entire flow path of the fluidized bed.

[0074] It should be understood that if only one of the multiple grids in the fluidized bed adopts the aforementioned high-flow-rate grid 2, then this high-flow-rate grid 2 can be located at the bottom of the heat exchange tube 100. Considering the silicon powder content in the mixed gas flow, in this embodiment, multiple or all of the grids can adopt the aforementioned high-flow-rate grid 2 to ensure stable and smooth flow of the mixed gas flow. Considering that the temperature of the mixed gas flow is relatively low when it reaches the upper layer of the heat exchange tube 100, at which point the silicon powder will basically not coke, and the silicon powder content is also reduced; therefore, in this embodiment, it is preferable to adopt high-flow-rate grid 2 for multiple grids in the lower layer of the heat exchange tube; multiple high-flow-rate grids 2 can be arranged sequentially from bottom to top in the lower layer of the heat exchange tube 100.

[0075] In this embodiment, since the area of ​​the high-flow region 200 formed on a single high-flow grille 2 is relatively large, although it can increase the flowability of the mixed airflow, it may cause the airflow to be too concentrated; therefore, in this embodiment, such as Figure 8 As shown, the support chains 210 are intersecting between two adjacent high-flow-rate grilles 2. That is, from the axial direction, the high-flow-rate areas 200 between two adjacent high-flow-rate grilles 2 can intersect to form a diamond-shaped or positive-direction flow area similar to a traditional grille, thereby achieving the dispersion of the mixed airflow.

[0076] It should be understood that the specific value of the intersection angle α of the support chain 210 between two adjacent high-flow-rate grilles 2 can be determined by those skilled in the art based on their actual needs. For example, the intersection angle α can be 30° to 90°, preferably 60°. It should be noted that if more than two high-flow-rate grilles 2 are used, the support chains 210 of the first and last high-flow-rate grilles 2 of three consecutive high-flow-rate grilles 2 can be arranged in parallel to avoid excessive total resistance of the mixed airflow along the flow path.

[0077] It is understandable that the specific number of grilles installed on the heat exchange tube 100 can be determined by those skilled in the art based on their actual needs. The specific number of high-flow-rate grilles 2 can also be determined by those skilled in the art based on their actual needs; preferably, the number of high-flow-rate grilles 2 should account for 30% to 50% of the total number of grilles, and the calculated result should be rounded down. Generally, the length of the heat exchange tube 100 is about 20m, requiring 4 to 6 grilles. Therefore, 2 to 3 of the lower-layer grilles can be high-flow-rate grilles 2.

[0078] Another aspect of this application provides a fluidized bed, one preferred embodiment of which includes the above-described grid arrangement structure.

[0079] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A high-flow-rate grille, characterized in that, include: Multiple stiffeners; Multiple sleeves; all the sleeves are divided into multiple rows, and the multiple sleeves in each row are connected sequentially along the arrangement direction by the stiffeners to form a support chain for fixing the heat exchange tubes; Support ring; the support ring is used to connect the two ends of all the support chains; Between at least one pair of adjacent support chains, at least one pair of corresponding sleeves are not connected by the stiffeners to form a high flow area.

2. The high-flow-rate grille as described in claim 1, characterized in that, There are multiple high-flow areas.

3. The high-flow-rate grille as described in claim 2, characterized in that, The high-flow area is formed between multiple pairs of adjacent support chains.

4. The high-flow-rate grille as described in claim 3, characterized in that, A single high-flow area is formed between each pair of adjacent support chains.

5. The high-flow-rate grille as described in claim 3, characterized in that, Multiple high-flow areas are formed between each pair of adjacent support chains.

6. The high-flow-rate grille as described in claim 3, characterized in that, A single high-flow region is formed between at least one pair of adjacent support chains, and a plurality of spaced high-flow regions are formed between at least one pair of adjacent support chains.

7. The high-flow-rate grille according to any one of claims 3-6, characterized in that, At least one of the high-flow areas corresponds to multiple pairs of sleeves that are not connected by the stiffeners.

8. The high-flow-rate grille as described in claim 5 or 6, characterized in that, For the multiple high-flow regions formed between adjacent support chains, the number of sleeves not connected by the ribs corresponding to each high-flow region is the same.

9. The high-flow-rate grille as described in claim 5 or 6, characterized in that, For the multiple high-flow regions formed between adjacent support chains, the number of sleeves not connected by the ribs corresponding to each high-flow region is not exactly the same.

10. The high-flow-rate grille as described in claim 3, characterized in that, All of the high-flow areas are evenly distributed across the entire cross-section of the high-flow grid.

11. The high-flow-rate grille as described in claim 3, characterized in that, All of the high-flow areas are concentrated in the central region of the cross-section of the high-flow grid.

12. The high-flow-rate grille as described in claim 3, characterized in that, Along the arrangement direction perpendicular to the support chains, among the plurality of high flow regions formed between each pair of adjacent support chains, at least one pair of adjacent high flow regions is spaced apart, and the spacing distance is at least the distance between a pair of adjacent support chains.

13. The high-flow-rate grille as described in claim 3, characterized in that, Along the arrangement direction perpendicular to the support chains, the plurality of high-flow regions formed between each pair of adjacent support chains remain continuous.

14. The high-flow-rate grille as described in claim 3, characterized in that, The high-flow area is formed between all adjacent support chains.

15. The high-flow-rate grille as described in claim 14, characterized in that, The adjacent support chains are completely spaced apart to form the high-flow area.

16. A grid arrangement structure, characterized in that, It includes a plurality of grilles spaced apart along the length of the heat exchange tube; wherein at least one of the grilles located in the lower layer of the heat exchange tube is a high-flow grille as described in any one of claims 1-15.

17. The grid arrangement structure as described in claim 16, characterized in that, Multiple high-flow-rate grids are used; multiple high-flow-rate grids are arranged sequentially from bottom to top on the heat exchange tube.

18. The grid arrangement structure as described in claim 17, characterized in that, The support chains are positioned in a cross pattern between adjacent high-flow-rate grids.

19. The grid arrangement structure as described in claim 18, characterized in that, The cross angle of the support chains between adjacent high-flow grids is 30°~90°.

20. The grid arrangement structure as described in claim 18, characterized in that, In three consecutive high-flow grids, the support chains of the first and last high-flow grids are parallel.

21. The grid arrangement structure as described in claim 16, characterized in that, The number of high-flow-rate grilles used is 30% to 50% of all the grilles.

22. A fluidized bed, characterized in that, Includes the grid arrangement structure as described in any one of claims 16-21.

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