Multi-nozzle jet fluidized bed

Abstract

The invention relates to the technical field of fluidized beds, in particular to a multi-nozzle jet fluidized bed which comprises a shell, the shell comprises a main body section and an air inlet end, and the air inlet end is provided with a main conical surface, a surrounding conical surface and a plurality of auxiliary conical surfaces. The main conical surface and the main body section are coaxially arranged, the main conical surface protrudes towards the outer portion of the shell, and a first air inlet is formed in the vertex of the main conical surface. The multiple auxiliary conical surfaces surround the main conical surface and are sequentially arranged in the circumferential direction of the main conical surface, the multiple auxiliary conical surfaces all protrude towards the outer portion of the shell, a second air inlet is formed in the vertex of each auxiliary conical surface, and a third air inlet is formed in the side wall, opposite to the first air inlet, of each auxiliary conical surface. The surrounding conical surface surrounds the auxiliary conical surfaces, the surrounding conical surface and the main conical surface are coaxially arranged, the surrounding conical surface protrudes towards the outer portion of the shell, and a plurality of fourth air inlets are evenly formed in the surrounding conical surface in the circumferential direction at intervals. The multi-nozzle jet fluidized bed can be suitable for treating particles with wide screening particle sizes, and is beneficial to improving the uniformity of particle distribution.

Description

Technical Field

[0001] This invention relates to the field of fluidized bed technology, and more particularly to a multi-nozzle jet fluidized bed. Background Technology

[0002] In fluidized bed technology applications, the handling of wide-size particles places extremely high demands on the stability and uniformity of the fluidized bed operation. Fine particles in a wide-size range are easily fluidized, typically entering the fluidized state at relatively low gas velocities, while coarse particles require higher gas velocities to begin fluidization and are prone to forming dead zones at the bottom of the bed. Traditional jet beds introduce high-speed gas through a single nozzle at the bottom center, forming a stable central jet channel within the wide-size particles, thus penetrating the entire bed and promoting particle mixing. However, as the bed diameter increases, the kinetic energy and penetration capability of the single central jet are insufficient to support uniform fluidization and stable jetting throughout the bed, resulting in uneven gas distribution and easily leading to non-ideal fluidization phenomena such as "dead zones" and "nodding" within the bed. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-nozzle jet fluidized bed that is suitable for processing particles with a wide sieve size and helps to improve the uniformity of particle distribution.

[0004] To achieve this objective, the present invention adopts the following technical solution: A multi-nozzle jet fluidized bed is provided, the multi-nozzle jet fluidized bed including a shell, the shell including a main body section and an air inlet end, the air inlet end having: The main conical surface is coaxially arranged with the main body section and protrudes outward toward the outer shell. A first air inlet is provided at the apex of the main conical surface. Multiple auxiliary conical surfaces are arranged sequentially around the main conical surface and along the circumference of the main conical surface. Each of the multiple auxiliary conical surfaces protrudes towards the outside of the outer shell. A second air inlet is provided at the apex of each auxiliary conical surface, and a third air inlet is provided on the side wall of each auxiliary conical surface facing away from the first air inlet. A conical surface surrounds a plurality of auxiliary conical surfaces. The conical surface is coaxial with the main conical surface and protrudes outward toward the outer surface of the outer shell. A plurality of fourth air inlets are evenly spaced along the circumference on the conical surface.

[0005] Optionally, the total air intake at the first air intake, the second air intake, the third air intake, and the fourth air intake is a; The air intake volume at the first air intake is b, satisfying: 5% ≤ b / a ≤ 10%; and / or, The sum of all air intake volumes at the second air intake is c, satisfying: 15% ≤ c / a ≤ 20%; and / or, The sum of the air intake at the third air intake and the fourth air intake is d, which satisfies: 70%≤d / a≤80%.

[0006] Optionally, at least three auxiliary conical surfaces are provided, and the at least three auxiliary conical surfaces are arranged sequentially, with each auxiliary conical surface connected to the main conical surface and each auxiliary conical surface connected to the circumferential conical surface.

[0007] Optionally, the cone angle of the auxiliary cone surface ranges from 60° to 70°; And / or, the ratio of the diameter of the second air inlet to the outer diameter of the main body section is in the range of 0.02-0.05.

[0008] Optionally, each of the auxiliary conical surfaces has a plurality of third air inlets on its sidewall facing away from the first air inlet, and the plurality of third air inlets on each auxiliary conical surface are arranged sequentially along the circumference of the auxiliary conical surface.

[0009] Optionally, the ratio of the diameter of the third air inlet to the outer diameter of the main body section ranges from 0.002 to 0.01. And / or, the ratio of the diameter of the fourth air inlet to the outer diameter of the main body section is in the range of 0.002-0.01.

[0010] Optionally, the cone angle of the circumferential cone surface ranges from 110° to 130°.

[0011] Optionally, the air intake direction of the first air inlet is parallel to the axial direction of the main body section; And / or, the air intake direction of the second air intake is parallel to the axial direction of the main body section; And / or, the air intake direction of the third air intake is parallel to the axial direction of the main body section; And / or, the air intake direction of the fourth air inlet is parallel to the axial direction of the main body section.

[0012] Optionally, the air intake end further includes a frustum-shaped surface, one end of which is connected to the main body section along its own axial direction, and the other end is connected to the circumferential cone surface.

[0013] Optionally, the cone angle of the frustum surface is in the range of 30°-40°.

[0014] The beneficial effects of this invention are: This invention provides a multi-nozzle jet fluidized bed, including a shell. The shell includes a main body section and an air inlet end. The air inlet end has a main conical surface, a surrounding conical surface, and multiple auxiliary conical surfaces. The main conical surface is coaxially arranged with the main body section and protrudes outwards from the shell. A first air inlet is located at the apex of the main conical surface. Multiple auxiliary conical surfaces surround the main conical surface and are arranged sequentially along its circumference. All auxiliary conical surfaces protrude outwards from the shell. A second air inlet is located at the apex of each auxiliary conical surface, and a third air inlet is located on the sidewall of each auxiliary conical surface facing away from the first air inlet. The surrounding conical surface surrounds the multiple auxiliary conical surfaces. The surrounding conical surface is coaxially arranged with the main conical surface and protrudes outwards from the shell. Multiple fourth air inlets are evenly spaced along the circumference of the surrounding conical surface. The airflow at the second inlet prevents coarse particle "dead zones" on the main cone surface, the airflow at the third inlet prevents coarse particle "dead zones" on the auxiliary cone surface, and the fourth inlet prevents coarse particle "dead zones" on the circumferential cone surface. Furthermore, the fourth inlet's proximity to the sidewall of the outer shell prevents excessively slow airflow at the sidewall. By setting multiple cone surfaces and inlets at the air inlet end of the multi-nozzle jet fluidized bed's outer shell, multiple jetting zones and annular gaps can be formed, preventing coarse particles from forming "dead zones" and "surges" within the bed, resulting in more uniform particle distribution and improved fluidization quality. Attached Figure Description

[0015] Figure 1 This is a front view of the multi-nozzle jet fluidized bed provided in an embodiment of the present invention; Figure 2 This is a bottom view of the multi-nozzle jet fluidized bed provided in an embodiment of the present invention; Figure 3 This is a time-averaged two-phase diagram of a multi-nozzle jet fluidized bed provided in an embodiment of the present invention; Figure 4 This is a radial solids content distribution diagram of a multi-nozzle jet fluidized bed at different heights provided in an embodiment of the present invention.

[0016] In the picture: 1. Main section; 2. Inlet end; 21. Main cone surface; 211. First air inlet; 22. Auxiliary cone surface; 221. Second air inlet; 222. Third air inlet; 23. Peripheral cone surface; 231. Fourth air inlet; 24. Frustum surface; 3. Enlarged section; 10. Auxiliary air intake device; 20. Air supply pipe. Detailed Implementation

[0017] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0018] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0019] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0020] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0021] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0022] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0023] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0024] In fluidized bed technology applications, the handling of wide-size particles places extremely high demands on the stability and uniformity of the fluidized bed operation. Fine particles in a wide-size range are easily fluidized, typically entering the fluidized state at relatively low gas velocities, while coarse particles require higher gas velocities to begin fluidization and are prone to forming dead zones at the bottom of the bed. Traditional jet beds introduce high-speed gas through a single nozzle at the bottom center, forming a stable central jet channel within the wide-size particles, thus penetrating the entire bed and promoting particle mixing. However, as the bed diameter increases, the kinetic energy and penetration capability of the single central jet are insufficient to support uniform fluidization and stable jetting throughout the bed, resulting in uneven gas distribution and easily leading to non-ideal fluidization phenomena such as "dead zones" and "nodding" within the bed.

[0025] Therefore, this embodiment provides a multi-nozzle jet fluidized bed to solve the above problems. The multi-nozzle jet fluidized bed is suitable for processing particles with a wide sieve size and helps to improve the uniformity of particle distribution.

[0026] like Figures 1-2 As shown, the multi-nozzle jet fluidized bed of this embodiment includes a shell, which includes a main body section 1 and an air inlet end 2. Optionally, the shell also includes an enlarged section 3, which is located on the side of the main body section 1 away from the air inlet end 2.

[0027] The air intake end 2 has a main conical surface 21, a surrounding conical surface 23, and multiple auxiliary conical surfaces 22. The main conical surface 21 is coaxially arranged with the main body section 1, protruding outwards towards the outer shell, and has a first air intake 211 at its apex. Multiple auxiliary conical surfaces 22 surround the main conical surface 21 and are arranged sequentially along its circumference, all protruding outwards towards the outer shell. Each auxiliary conical surface 22 has a second air intake 221 at its apex, and a third air intake 222 on its sidewall facing away from the first air intake 211. The surrounding conical surface 23 surrounds the multiple auxiliary conical surfaces 22, is coaxially arranged with the main conical surface 21, and protrudes outwards towards the outer shell. Multiple fourth air intakes 231 are evenly spaced along the circumference of the surrounding conical surface 23.

[0028] The airflow at the second inlet 221 prevents coarse particle "dead zones" from existing on the main cone surface 21. The airflow at the third inlet 222 prevents coarse particle "dead zones" from existing on the auxiliary cone surface 22. The fourth inlet 231 prevents coarse particle "dead zones" from existing on the circumferential cone surface 23. Furthermore, the fourth inlet 231 is close to the side wall of the outer shell, which also prevents the airflow at the side wall from being too slow. By setting multiple cone surfaces and inlets at the air inlet end 2 of the outer shell of the multi-nozzle jet fluidized bed, multiple jetting zones and annular gap zones can be formed, preventing coarse particles from forming "dead zones" and "surges" and other non-ideal fluidization phenomena inside the bed. The particle distribution is more uniform, thereby improving the fluidization quality.

[0029] like Figure 2 As shown, optionally, in this embodiment, at least three auxiliary conical surfaces 22 are provided, and the at least three auxiliary conical surfaces 22 are sequentially connected, with each auxiliary conical surface 22 connected to the main conical surface 21 and each auxiliary conical surface 22 connected to the circumferential conical surface 23. Of course, in other embodiments, the multiple auxiliary conical surfaces 22 may not be directly connected to each other, but indirectly connected through other planes, inclined surfaces, or curved surfaces. Similarly, each auxiliary conical surface 22 may not be directly connected to the main conical surface 21, but indirectly connected through other planes, inclined surfaces, or curved surfaces. And each auxiliary conical surface 22 may not be directly connected to the circumferential conical surface 23, but indirectly connected through other planes, inclined surfaces, or curved surfaces.

[0030] Optionally, in this embodiment, four auxiliary cone surfaces 22 are provided, and the four auxiliary cone surfaces 22 are sequentially arranged along the circumference of the main cone surface 21. Of course, in other embodiments, three, five, six or more auxiliary cone surfaces 22 can also be provided, which can be adjusted according to the size of the multi-nozzle jet fluidized bed, fluidization performance requirements and other conditions.

[0031] Optionally, in this embodiment, the main conical surface 21 is located below the circumferential conical surface 23. Therefore, the second air inlet 221 is located close to the first air inlet 211 and far away from the fourth air inlet 231. Setting the third air inlet 222 can ensure that there is no "dead zone" in the area between the second air inlet 221 and the fourth air inlet 231.

[0032] Optionally, in this embodiment, the cone angle of the main cone surface 21 is equal to the cone angle of the auxiliary cone surface 22. Therefore, along the axial direction of the main body segment 1, the first air inlet 211 and the second air inlet 221 are at the same vertical distance from the main body segment 1.

[0033] Optionally, a nozzle is provided at the second air inlet 221 to ensure that the airflow velocity entering the second air inlet 221 meets the preset value.

[0034] Optionally, the cone angle of the auxiliary cone 22 can be between 60° and 70°. If the cone angle of the auxiliary cone 22 is less than 60°, the airflow entering through the second inlet 221 will exit with a narrower cone angle, resulting in a relatively large angle with the horizontal plane. This causes the airflow to primarily develop in the vertical direction, limiting its lateral diffusion capacity. This makes it difficult for the gas entering through the second inlet 221 to effectively cover the area far from the central axis of the auxiliary cone 22, thus forming a fluidization blind zone. If the cone angle of the auxiliary cone 22 is greater than 70°, the airflow entering through the second inlet 221 will exit with a larger cone angle. An excessively large cone angle means that the airflow entering through the second inlet 221 will rapidly diffuse laterally. Although the coverage area expands, the airflow flux per unit area decreases, and the axial penetration depth of the airflow is significantly reduced. This makes it difficult for the airflow entering through the second inlet 221 to penetrate deep into the bed, only creating local disturbances near the axial region of the second inlet 221.

[0035] Optionally, the cone angle of the auxiliary cone surface 22 is 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69° or 70°.

[0036] Optionally, the ratio of the diameter of the second air inlet 221 to the outer diameter of the main body section 1 can be between 0.02 and 0.05. If the diameter of the second air inlet 221 is too large, the flow velocity will be insufficient for a given airflow rate, resulting in insufficient impact force on the particles. If the diameter of the second air inlet 221 is too small, the flow rate will be insufficient for a given flow velocity, which is also not conducive to improving the impact force on the particles.

[0037] Optionally, each auxiliary conical surface 22 has multiple third air inlets 222 on its sidewall facing away from the first air inlet 211, and the multiple third air inlets 222 on each auxiliary conical surface 22 are arranged sequentially along the circumference of the auxiliary conical surface 22. Optionally, in this embodiment, each auxiliary conical surface 22 has three third air inlets 222 on its sidewall facing away from the first air inlet 211, that is, a total of twelve third air inlets 222 are provided. Of course, in other embodiments, the number of third air inlets 222 can be adjusted according to the size of the multi-nozzle jet fluidized bed and fluidization requirements. Optionally, multiple rows of third air inlets 222 can also be provided on the sidewall facing away from the first air inlet 211 of each auxiliary conical surface 22. The number and diameter of each row of third air inlets 222 can be the same or different, and can be adjusted according to the actual situation.

[0038] Optionally, the ratio of the diameter of the third air inlet 222 to the outer diameter of the main body section 1 ranges from 0.002 to 0.01. Since the third air inlet 222 is an auxiliary air inlet, the airflow rate here is less than that at the first air inlet 211 or the second air inlet 221. Therefore, the diameter of each third air inlet 222 is smaller than that of the first air inlet 211 or the second air inlet 221. If the ratio of the diameter of the third air inlet 222 to the outer diameter of the main body section 1 is less than 0.002, the flow rate will be insufficient at a constant velocity, which is not conducive to increasing the impact force on the particles. If the ratio of the diameter of the third air inlet 222 to the outer diameter of the main body section 1 is greater than 0.01, the flow rate will be insufficient at a constant airflow rate, resulting in insufficient impact force on the particles.

[0039] Optionally, the ratio of the diameter of the fourth air inlet 231 to the outer diameter of the main body section 1 ranges from 0.002 to 0.01. Since the fourth air inlet 231 is an auxiliary air inlet, the airflow rate here is less than that at the first air inlet 211 or the second air inlet 221. Therefore, the diameter of each fourth air inlet 231 is smaller than that of the first air inlet 211 or the second air inlet 221. However, if the ratio of the diameter of the fourth air inlet 231 to the outer diameter of the main body section 1 is less than 0.002, the flow rate will be insufficient at a constant velocity, which is not conducive to improving the impact force on the particles. In this case, the fourth air inlet 231 will be effective in eliminating the "dead zone" at the conical surface 23, but the effect may be insignificant. If the ratio of the diameter of the fourth air inlet 231 to the outer diameter of the main body section 1 is greater than 0.01, the flow rate will be insufficient at a constant airflow rate, resulting in too little impact force on the particles, which will also affect the overall effect.

[0040] Optionally, the cone angle of the surrounding cone surface 23 can range from 110° to 130°. If the cone angle of the surrounding cone surface 23 is less than 110°, the angle between the surrounding cone surface 23 and the horizontal plane is too large, and the surrounding cone surface 23 will not completely surround the auxiliary cone surfaces 22. At the same time, the axial height of the surrounding cone surface 23 is relatively high, causing the airflows input from the first air inlet 211 and the second air inlet 221 to converge prematurely under the constraint of the surrounding cone surface 23 before entering the main body section 1 of the multi-nozzle jet fluidized bed. This increases the shearing action between the airflows entering from each air inlet, generating unnecessary energy dissipation and turbulent pulsation, disrupting the stable jet structure independently formed by the airflows entering from each air inlet, and consequently impairing the uniformity of particle distribution. If the cone angle of the surrounding cone surface 23 is greater than 130°, the angle between the surrounding cone surface 23 and the horizontal plane is too small, and there is a risk of particle accumulation on the surrounding cone surface 23, which will result in dead zones in the multi-nozzle jet fluidized bed and is not conducive to improving particle circulation efficiency.

[0041] Optionally, the cone angle of the circumferential cone 23 is 110°, 115°, 120°, 125° or 130°.

[0042] Optionally, the air intake direction of the first air inlet 211 is parallel to the axial direction of the main body section 1. In this embodiment, the main body section 1 is vertically arranged, the air inlet end 2 is located at the bottom of the multi-nozzle jet fluidized bed, and the air intake direction of the first air inlet 211 is vertically upward.

[0043] Optionally, the air intake direction of the second air intake 221 is parallel to the axis of the main body section 1, that is, it is also vertically upward.

[0044] Optionally, the air intake direction of the third air intake 222 is parallel to the axis of the main body section 1, that is, it is also vertically upward.

[0045] Optionally, the air intake direction of the fourth air intake 231 is parallel to the axis of the main body section 1, that is, it is also vertically upward.

[0046] Optionally, the intake end 2 also includes a frustum-shaped surface 24, one end of which is connected to the main body section 1 along its own axial direction, and the other end is connected to the circumferential conical surface 23. The frustum-shaped surface 24 is used to connect the main body section 1 and the circumferential conical surface 23 of different sizes. The larger diameter end of the frustum-shaped surface 24 is connected to the main body section 1, and the smaller diameter end is connected to the circumferential conical surface 23.

[0047] Optionally, the cone angle of the frustum surface 24 can be in the range of 30°-40°. If the cone angle of the frustum surface 24 is too large, it is easy to form a "dead zone". If the cone angle of the frustum surface 24 is too small, the frustum surface 24 needs to be set to be longer, occupying the height space of the main body segment 1.

[0048] Optionally, the cone angle of the frustum surface 24 is 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39° or 40°.

[0049] Optionally, an auxiliary air intake device 10 and an air delivery pipe 20 are provided at both the third air intake 222 and the fourth air intake 231. The air delivery pipe 20 delivers gas to the auxiliary air intake device 10, and the auxiliary air intake device 10 injects gas into the air intake. Optionally, the auxiliary air intake device 10 is a nozzle.

[0050] Optionally, in this embodiment, the multi-nozzle jet fluidized bed receives air only from the first air inlet 211, the second air inlet 221, the third air inlet 222, and the fourth air inlet 231. The total air intake at the first air inlet 211, the second air inlet 221, the third air inlet 222, and the fourth air inlet 231 is a.

[0051] Optionally, the air intake volume at the first air intake 211 is b, satisfying: 5%≤b / a≤10%. If the air intake volume at the first air intake 211 is too small, it will be difficult to ensure the flow rate. If the air intake volume at the first air intake 211 is too large, the auxiliary effect of other air intakes will be reduced, which will be difficult to improve the uniformity of particle distribution.

[0052] Optionally, the sum of the air intake volumes at all the second air inlets 221 is c, satisfying: 15% ≤ c / a ≤ 20%, meaning the air intake volume at each second air inlet 221 is approximately 3.75%a-5%a. If the proportion of air intake volume at the second air inlet 221 is too small, it will be detrimental to ensuring the flow velocity in the annular region where the second air inlet 221 is located. If the proportion of air intake volume at the second air inlet 221 is too large, the auxiliary effect of other air inlets will be reduced, which will be detrimental to improving the uniformity of particle distribution.

[0053] Optionally, the sum of the air intake at all the third air intake 222 and the fourth air intake 231 is d, which satisfies: 70%≤d / a≤80%.

[0054] To verify the fluidization quality of the multi-nozzle jet fluidized bed when it meets the above-mentioned air intake ratio, this embodiment provides five application examples.

[0055] Application Example 1: The gas distribution method includes the following: the air intake at the first air intake 211 accounts for 10% of the total air intake; the sum of the air intake at the four second air intakes 221 accounts for 20% of the total air intake; and the sum of the air intake at all the third air intakes 222 and the fourth air intake 231 accounts for 70% of the total air intake.

[0056] The gas entering from the four second air inlets 221 merges with the gas entering from the first air inlet 211. Subsequently, the auxiliary airflows from the third air inlet 222 and the fourth air inlet 231 combine with the airflow in the multi-nozzle jet fluidized bed to provide gas supply for the entire multi-nozzle jet fluidized bed.

[0057] Application Example 2: The gas distribution method includes the following: the air intake at the first air intake 211 accounts for 5% of the total air intake; the sum of the air intake at the four second air intakes 221 accounts for 15% of the total air intake; and the sum of the air intake at all the third air intakes 222 and the fourth air intake 231 accounts for 80% of the total air intake.

[0058] Application Example 3: The air intake at the first air intake 211 accounts for 7.5% of the total air intake, the sum of the air intake at the four second air intakes 221 accounts for 17.5% of the total air intake, and the sum of the air intake at all the third air intakes 222 and the fourth air intake 231 accounts for 75% of the total air intake.

[0059] Application Example 4: The air intake at the first air intake 211 accounts for 25% of the total air intake, the sum of the air intake at the four second air intakes 221 accounts for 35% of the total air intake, and the sum of the air intake at all the third air intakes 222 and the fourth air intake 231 accounts for 40% of the total air intake.

[0060] Application Example 5: The air intake at the first air intake 211 accounts for 2% of the total air intake, the sum of the air intake at the four second air intakes 221 accounts for 8% of the total air intake, and the sum of the air intake at all the third air intakes 222 and the fourth air intake 231 accounts for 90% of the total air intake.

[0061] It is evident that Application Examples 1-3 all meet the aforementioned superior gas distribution conditions, while Application Examples 4 and 5 do not meet the aforementioned superior gas distribution conditions. Figure 3 Five application examples of time-averaged two-phase diagrams are shown. Figure 4 The diagram shows the radial solids content distribution at different heights for five application examples.

[0062] By applying the two-phase distribution diagrams of Examples 1-3 and the radial solids content at different heights, it can be seen that by setting up a combination of multiple second air inlets 221 and auxiliary multiple third air inlets 222 and fourth air inlets 231, the radial distribution of particles in the multi-nozzle jet fluidized bed can be enhanced, and abnormal operations such as the inability to spray or unstable spraying in the reactor of a large multi-nozzle jet fluidized bed can be avoided. At the same time, combined with a suitable air distribution method, the goals of making the distribution of wide-size particles more uniform, increasing the contact area between particles and gas in the multi-nozzle jet fluidized bed, and increasing the particle distribution height can be achieved simultaneously, thereby ultimately improving the fluidization quality of wide-size particles.

[0063] By comparing the time-averaged two-phase diagrams of Application Example 4-5 and Application Example 1-3, it can be seen that Application Example 1-3 has a higher fluidization height than Application Example 4-5, and the fluidization effect at the highest fluidization height is more uniform. This phenomenon can also be observed through… Figure 4The variation of radial solids content at a mid-height H=1.20m with radial position shows that the radial solids content in the mid-radial part of the multi-nozzle jet fluidized bed in Application Examples 4-5 is lower than that in Application Examples 1-3, and the fluctuation of radial solids content with radial position is greater in Application Examples 1-3. This phenomenon indicates that the superior air distribution method described above can improve the particle distribution height without sacrificing radial distribution uniformity.

[0064] pass Figure 4 The changes in radial solids content at heights H=0.30m and H=0.60m in Application Examples 4-5 and 1-3 with radial position show that, at the lower position of the multi-nozzle jet fluidized bed, the radial solids content in Application Example 1-3 fluctuates less with radial position than that in Application Example 4-5. This indicates that the superior air intake distribution method described above can better promote the radial uniformity of wide-size particles at the lower position of the multi-nozzle jet fluidized bed.

[0065] By observing separately Figure 4 The variation of radial solids content with radial position at different heights in Application Examples 1-5 shows that in Application Example 1, the radial solids content at uniform heights of 0.3m, 0.6m, 0.9m, and 1.2m is 0.30, 0.30, 0.20, and 0.075, respectively; in Application Example 2, the radial solids content at uniform heights of 0.3m, 0.6m, 0.9m, and 1.2m is 0.31, 0.28, 0.20, and 0.06, respectively; and in Application Example 3, the radial solids content at uniform heights of 0.3m, 0.6m, and 1.2m is 0.31, 0.28, 0.20, and 0.06, respectively. The radial solids content at uniform heights of 0.9m and 1.2m in Application Example 4 was 0.30, 0.30, 0.175, and 0.075, respectively; the radial solids content at uniform heights of 0.3m, 0.6m, 0.9m, and 1.2m in Application Example 5 was 0.35, 0.35, 0.25, and 0.05, respectively. This shows that the decreasing trend of solids content from bottom to top in the multi-nozzle jet fluidized bed in Application Examples 1-3 is slower than in Application Examples 4-5. Therefore, it can be concluded that the superior air intake distribution method described above can better promote the longitudinal uniformity of wide-size particles.

[0066] In summary, the multi-nozzle jet fluidized bed provided in this embodiment achieves uniform distribution of wide-size particles in the radial and longitudinal directions through the combination of a first air inlet 211, four second air inlets 221, and multiple auxiliary air inlets, combined with a suitable air distribution method. It also avoids abnormal operations such as the inability to agitate or the unstable agitation in the reactor of a large multi-nozzle jet fluidized bed, thereby ultimately improving the fluidization quality of wide-size particles.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-nozzle jet fluidized bed, characterized in that, The multi-nozzle jet fluidized bed includes a shell, the shell comprising a main body section (1) and an air inlet end (2), the air inlet end (2) having: Main conical surface (21), the main conical surface (21) is coaxially arranged with the main body section (1), the main conical surface (21) protrudes towards the outside of the outer shell, and a first air inlet (211) is opened at the apex of the main conical surface (21). Multiple auxiliary conical surfaces (22) are arranged sequentially around the main conical surface (21) and along the circumference of the main conical surface (21). The multiple auxiliary conical surfaces (22) protrude towards the outside of the outer shell. A second air inlet (221) is provided at the apex of each auxiliary conical surface (22). A third air inlet (222) is provided on the side wall of each auxiliary conical surface (22) facing away from the first air inlet (211). A conical surface (23) surrounds a plurality of auxiliary conical surfaces (22). The conical surface (23) is coaxial with the main conical surface (21) and protrudes outward toward the outer side of the outer shell. A plurality of fourth air inlets (231) are evenly spaced along the circumference on the conical surface (23).

2. The multi-nozzle jet fluidized bed according to claim 1, characterized in that, The total air intake at the first air intake (211), the second air intake (221), the third air intake (222), and the fourth air intake (231) is a; The air intake volume at the first air intake (211) is b, satisfying: 5% ≤ b / a ≤ 10%; and / or, The sum of the air intake volumes at all the second air intakes (221) is c, satisfying: 15% ≤ c / a ≤ 20%; and / or, The sum of the air intake at the third air intake (222) and the fourth air intake (231) is d, which satisfies: 70%≤d / a≤80%.

3. The multi-nozzle jet fluidized bed according to claim 1, characterized in that, At least three auxiliary cone surfaces (22) are provided, and the at least three auxiliary cone surfaces (22) are arranged sequentially, and each auxiliary cone surface (22) is connected to the main cone surface (21), and each auxiliary cone surface (22) is connected to the circumferential cone surface (23).

4. The multi-nozzle jet fluidized bed according to claim 1, characterized in that, The cone angle of the auxiliary cone surface (22) ranges from 60° to 70°. And / or, the ratio of the diameter of the second air inlet (221) to the outer diameter of the main body section (1) is in the range of 0.02-0.

05.

5. The multi-nozzle jet fluidized bed according to claim 1, characterized in that, Each of the auxiliary conical surfaces (22) has a plurality of third air inlets (222) on its sidewall facing away from the first air inlet (211), and the plurality of third air inlets (222) on each of the auxiliary conical surfaces (22) are arranged sequentially along the circumference of the auxiliary conical surface (22).

6. The multi-nozzle jet fluidized bed according to any one of claims 1-5, characterized in that, The ratio of the diameter of the third air inlet (222) to the outer diameter of the main body section (1) ranges from 0.002 to 0.01; And / or, the ratio of the diameter of the fourth air inlet (231) to the outer diameter of the main body section (1) is in the range of 0.002-0.

01.

7. The multi-nozzle jet fluidized bed according to any one of claims 1-5, characterized in that, The cone angle of the circumferential cone surface (23) ranges from 110° to 130°.

8. The multi-nozzle jet fluidized bed according to any one of claims 1-5, characterized in that, The air intake direction of the first air inlet (211) is parallel to the axial direction of the main body section (1); And / or, the air intake direction of the second air inlet (221) is parallel to the axial direction of the main body section (1); And / or, the air intake direction of the third air inlet (222) is parallel to the axial direction of the main body section (1); And / or, the air intake direction of the fourth air inlet (231) is parallel to the axial direction of the main body section (1).

9. The multi-nozzle jet fluidized bed according to any one of claims 1-5, characterized in that, The air intake end (2) also includes a frustum (24), one end of which is connected to the main body section (1) along its own axis, and the other end is connected to the circumferential cone (23).

10. The multi-nozzle jet fluidized bed according to claim 9, characterized in that, The cone angle of the frustum surface (24) ranges from 30° to 40°.

Images