A spray dryer for alumina slurry

Abstract

The utility model relates to powder preparation equipment technical field discloses a kind of spray driers for alumina slurry, including barrel mechanism and the atomizing mechanism being set in barrel mechanism;Atomizing mechanism includes motor, rotating shaft driven by motor, convex strip connecting shaft, and high-pressure shear atomizing disc and centrifugal atomizing disc fixed on convex strip connecting shaft, the high-pressure shear atomizing disc is set in the top of centrifugal atomizing disc, atomizing mechanism further includes quick-release mechanism, for detachably connecting the convex strip connecting shaft with the rotating shaft, the lower end of the convex strip connecting shaft is connected with guide block, the upper end of the rotating shaft is equipped with the guide groove of being clamped with guide block. The utility model is through two-stage atomization structure, effectively breaks up slurry agglomeration, improves dry powder uniformity, simultaneously through the quick-release mechanism of guide block and snap ring cooperation, the quick disassembly and replacement of atomization core component are realized, greatly shorten maintenance downtime.

Description

Technical Field

[0001] This utility model relates to the field of powder preparation equipment technology, and in particular to a spray dryer for alumina slurry. Background Technology

[0002] Spray drying is a widely used unit operation in industries such as chemical, ceramic, and pharmaceutical. It atomizes liquid materials, such as solutions, suspensions, or slurries, into fine droplets through an atomizer, and then exposes them to hot air in a drying tower, causing the moisture to evaporate rapidly, thereby directly obtaining powder or granular products. For the preparation of alumina ceramic powder, spray drying is also a key process. Its purpose is to prepare alumina slurry into dry granular powder with good flowability and uniform particle size, so as to facilitate subsequent pressing and sintering.

[0003] In existing spray drying processes, centrifugal atomizing discs are the most commonly used atomizing components when processing slurries such as alumina. They rely on a motor to drive a rotating shaft, causing the atomizing disc to rotate at high speed. The slurry is thrown out and atomized into droplets under the action of centrifugal force. However, there are serious technical defects when using this conventional spray dryer directly to process alumina slurries.

[0004] First, during the preparation or transportation of alumina slurry, some soft or hard agglomerated particles are inevitably generated. If these agglomerated particles are not effectively dispersed before atomization, conventional single-stage centrifugal atomizing discs will find it difficult to break them up. This will result in uneven droplet size in the atomized liquid, which in turn will lead to a wide particle size distribution and poor uniformity of the alumina powder particles obtained after drying, seriously affecting the green density of the subsequent pressing and molding process and the quality of the final ceramic product.

[0005] Secondly, and more critically, alumina is a material with extremely high hardness and abrasiveness. Under high-speed rotation, the slurry causes severe erosion and wear on the centrifugal atomizing disc, making it one of the fastest-wearing components in the equipment. In existing spray dryer structures, the atomizing disc assembly is usually fixed to the main rotating shaft by flanges, bolts, or complex key connections. The structure is complex and compact. When the atomizing disc wears out and needs to be replaced, maintenance personnel must enter the drying tower and use various tools to perform tedious disassembly, reassembly, and calibration work, which takes a very long time.

[0006] Frequent and prolonged downtime for maintenance due to wear of the atomizing disc severely restricts the production continuity and overall efficiency of alumina powder, significantly increasing the operating and maintenance costs of the equipment. This is a technical problem that urgently needs to be solved in the field of alumina spray drying.

[0007] Therefore, this utility model proposes a spray dryer for alumina slurry to overcome the shortcomings of the prior art. Utility Model Content

[0008] To overcome the above shortcomings, this utility model provides a spray dryer for alumina slurry, which addresses the problems of slurry agglomeration leading to uneven atomization and poor dry powder quality, as well as the need for frequent replacement of atomizing discs due to wear, which are complex to disassemble and time-consuming to maintain.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a spray dryer for alumina slurry, comprising: a barrel mechanism, and an atomizing mechanism disposed within the barrel mechanism; the atomizing mechanism includes a motor and a rotating shaft driven by the motor.

[0010] The spray dryer of this utility model also includes a convex connecting shaft, and a high-pressure shear atomizing disc and a centrifugal atomizing disc fixedly connected to the convex connecting shaft; the atomizing mechanism also includes a quick-release mechanism for detachably connecting the convex connecting shaft to the rotating shaft.

[0011] The high-pressure shearing atomizing disc is positioned above the centrifugal atomizing disc along the axial direction of the convex connecting shaft, forming a two-stage processing structure of shearing and crushing followed by centrifugal atomization.

[0012] Furthermore, a guide block is connected to the lower end face of the convex connecting shaft, and a guide groove is provided on the upper end face of the rotating shaft to engage with the guide block. This structure is used to provide circumferential positioning and transmit the torque of the motor during assembly.

[0013] The quick-release mechanism includes a retaining ring, which comprises two semicircular rings that can open and close to each other. The semicircular rings are rotatably connected to the outer wall of the convex connecting shaft and are detachably locked with a nut by an eccentric threaded bolt located on its edge.

[0014] The inner wall of the retaining ring is provided with a protruding ring, and the outer wall of the rotating shaft is provided with an annular groove that mates with the protruding ring. When the retaining ring is locked, the protruding ring is engaged in the annular groove, thereby achieving axial locking between the protruding connecting shaft and the rotating shaft.

[0015] Preferably, the atomizing mechanism further includes a liquid collection hood, which is annular and disposed between the high-pressure shear atomizing disc and the liquid spray nozzle of the feed cylinder mechanism, for collecting and guiding the incoming slurry and preventing slurry splashing.

[0016] Preferably, the atomizing mechanism further includes a support frame, which is fixedly connected to the inside of the material cylinder mechanism and provides radial support to the rotating shaft to ensure its operational stability during high-speed rotation.

[0017] Preferably, the spray dryer further includes a hot air distributor, and an air inlet is provided on the upper side wall of the material cylinder mechanism. The air inlet is connected to the hot air distributor and is used to supply uniformly distributed hot air into the material cylinder mechanism.

[0018] Preferably, the spray dryer further includes a cyclone separator, and the bottom of the material cylinder mechanism is provided with a discharge port, which is connected to the cyclone separator through a pipe for gas-solid separation and collection of the dried powder product and the exhaust gas.

[0019] Preferably, an observation window is provided on the cylinder wall of the material cylinder mechanism, which allows the operator to monitor the atomization and drying conditions inside the material cylinder mechanism in real time.

[0020] Preferably, the spray dryer further includes a frame for supporting the barrel mechanism.

[0021] Preferably, the bottom of the frame is equipped with casters to facilitate the overall movement, transportation and on-site positioning of the equipment.

[0022] Preferably, the spray dryer further includes a control console fixed on the frame, which is used to centrally control the operating parameters of components such as the motor and the hot air distributor.

[0023] This utility model has the following beneficial effects: 1. This utility model solves the problem in the prior art that alumina slurry is prone to agglomeration and is difficult to disperse by single-stage atomization, resulting in uneven particle size and poor quality of the final dry powder. It achieves a highly efficient processing effect of first breaking up agglomerates and then finely atomizing, which significantly improves the uniformity and quality of the dried alumina powder.

[0024] 2. This utility model solves the problem in the prior art of complex disassembly and assembly, difficult maintenance, and time-consuming and labor-intensive disassembly when atomizing discs and other vulnerable parts need to be frequently replaced due to slurry wear. This is achieved by setting up a quick-release mechanism in which a guide block and guide groove cooperate to transmit torque and a split retaining ring and ring groove are engaged to achieve axial locking. The mechanism enables quick disassembly and replacement of the entire atomizing core component, greatly simplifies the maintenance process, shortens downtime, and improves the operating efficiency and maintainability of the equipment.

[0025] 3. This utility model solves the problems of easy splashing of slurry before atomization leading to material sticking to the inner wall of the barrel, and insufficient stability when the rotating shaft rotates at high speed by setting a liquid collection hood between the spray nozzle and the high-pressure shearing atomizing disc, as well as a support frame that provides support for the rotating shaft. It achieves the effects of guiding the slurry, preventing splashing, and ensuring the smooth operation of the atomizing mechanism, further enhancing the reliability of the equipment and the stability of the process. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of a spray dryer for alumina slurry proposed in this utility model; Figure 2 This is a schematic diagram of the atomization mechanism of a spray dryer for alumina slurry proposed in this utility model. Figure 3 This is a schematic diagram of the centrifugal atomizing disc part of a spray dryer for alumina slurry proposed in this utility model. Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0027] Legend: 1. Frame; 2. Casters; 3. Control console; 4. Material cylinder mechanism; 401. Spray nozzle; 402. Air inlet; 403. Discharge outlet; 5. Atomizing mechanism; 501. Liquid collection hood; 502. High-pressure shearing atomizing disc; 503. Centrifugal atomizing disc; 504. Rotating shaft; 505. Motor; 506. Support frame; 507. Convex connecting shaft; 6. Quick release mechanism; 601. Eccentric threaded bolt; 602. Nut; 603. Guide block; 604. Guide groove; 605. Convex ring; 606. Ring groove; 607. Snap ring; 7. Observation window; 8. Hot air distributor; 9. Cyclone separator. Detailed Implementation

[0028] Please refer to Figures 1 to 4 This utility model provides a spray dryer for alumina slurry, which aims to solve the problems in the prior art where alumina slurry easily agglomerates before atomization, resulting in uneven dry powder quality, and the complex replacement structure and long downtime after the atomizing disc wears out.

[0029] like Figure 1 As shown, the spray dryer for alumina slurry includes a cylinder mechanism 4 supported by a frame 1, and an atomizing mechanism 5 is provided inside the cylinder mechanism 4; the atomizing mechanism 5 includes a motor 505 fixedly installed at the bottom of the cylinder mechanism 4, and a rotating shaft 504 driven by the motor 505 and disposed inside the cylinder mechanism 4; further, referring to Figure 2 and Figure 3 The core part of the atomizing mechanism 5 includes a convex connecting shaft 507 disposed inside the feed cylinder mechanism 4, and a high-pressure shearing atomizing disk 502 and a centrifugal atomizing disk 503 fixedly connected to the convex connecting shaft 507. The high-pressure shearing atomizing disk 502 is disposed above the centrifugal atomizing disk 503 along the axial direction of the convex connecting shaft 507, forming a two-stage series atomizing structure. The atomizing mechanism 5 also includes a quick-release mechanism 6 for detachably connecting the convex connecting shaft 507 to the rotating shaft 504. Specifically, refer to Figure 3 and Figure 4 A guide block 603 is fixedly connected to the lower end face of the convex connecting shaft 507, and a guide groove 604 is provided on the upper end face of the rotating shaft 504 to engage with the guide block 603. This engaging structure is used to achieve precise circumferential positioning during assembly and to ensure that the torque of the rotating shaft 504 can be accurately transmitted to the convex connecting shaft 507. The quick-release mechanism 6 includes a retaining ring 607, which is composed of two semi-circular rings. These two semi-circular rings are rotatably connected to the outer wall of the convex connecting shaft 507 and connected by eccentric threaded bolts 6 symmetrically installed on its edges. 01 is locked or loosened with nut 602; a convex ring 605 is fixedly provided on the bottom of the inner wall of the retaining ring 607, and an annular groove 606 that mates with the convex ring 605 is provided on the outer wall of the rotating shaft 504. When the retaining ring 607 is locked closed by the eccentric threaded bolt 601 and nut 602, the convex ring 605 on its inner wall is engaged in the annular groove 606 of the rotating shaft 504. This engagement relationship realizes the axial locking of the convex connecting shaft 507, thereby reliably fixing the entire atomizing assembly carried by the convex connecting shaft 507 on the rotating shaft 504.

[0030] Please continue to refer to Figure 1 and Figure 2 To further improve the function of the atomizing mechanism 5 and ensure its stable operation, the atomizing mechanism 5 also includes a liquid collection hood 501 and a support frame 506. The liquid collection hood 501 is annular and is located between the high-pressure shearing atomizing disk 502 and the spray port 401 of the barrel mechanism 4. Its function is to initially collect and guide the alumina slurry flowing down from the spray port 401, ensuring that the slurry enters the high-pressure shearing atomizing disk 502 stably, and effectively preventing the undispersed slurry from splashing onto the inner wall of the barrel mechanism 4 under high-speed centrifugal action. The support frame 506 is fixedly connected to the inside of the barrel mechanism 4 and provides radial support for the rotating shaft 504 to ensure the dynamic balance and stability of the rotating shaft 504 during high-speed rotation.

[0031] To achieve a complete spray drying process, the equipment also includes a cooperating hot air system and a discharge separation system; refer to Figure 1The hot air system includes a hot air distributor 8. The upper side wall of the cylinder mechanism 4 is provided with an air inlet 402 that communicates with the hot air distributor 8. Hot air enters the cylinder mechanism 4 evenly through the air inlet 402 and exchanges heat fully with the slurry droplets atomized by the atomizing mechanism 5. The discharge separation system includes a cyclone separator 9. The bottom of the cylinder mechanism 4 is provided with a discharge port 403 for discharging the dried material. The discharge port 403 is connected to the upper feed port of the cyclone separator 9 through a pipe. An electric valve is installed at the pipe inlet to control the discharge. As the hot air distributor 8 continuously blows air into the cylinder mechanism 4 to provide pressure, the electric valve is opened through the control panel 3. The dried gas-solid mixture is blown into the only outlet discharge port 403 by the air blown out by the hot air distributor 8 and enters the cyclone separator 9 through the pipe for separation.

[0032] To facilitate the overall operation and monitoring of the equipment, auxiliary functional components are also set on the basic frame; casters 2 are installed at the bottom of the frame 1, which enables the entire equipment to move flexibly and be positioned easily; a control console 3 is also fixedly connected to the frame 1, which is used to centrally control and adjust process parameters such as the speed of the motor 505, the temperature and air volume of the hot air distributor 8; an observation window 7 is also opened on the cylinder wall of the material cylinder mechanism 4, through which the operator can monitor the atomization status and drying status inside the material cylinder in real time.

[0033] Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, please refer to Figure 2 In order to guide the slurry and prevent splashing, the atomizing mechanism 5 also includes a liquid collection hood 501, which is annular and disposed between the high-pressure shearing atomizing disc 502 and the spray nozzle 401 of the barrel mechanism 4.

[0034] As a preferred embodiment, please refer to Figure 2 In order to ensure the rotational stability of the rotating shaft 504, the atomizing mechanism 5 also includes a support frame 506, which is fixedly connected to the inside of the material cylinder mechanism 4 and provides support for the rotating shaft 504.

[0035] As a preferred embodiment, please refer to Figure 1 In order to supply the hot air required for drying into the barrel mechanism 4, the device also includes a hot air distributor 8, and the upper side wall of the barrel mechanism 4 is provided with an air inlet 402 that communicates with the hot air distributor 8.

[0036] As a preferred embodiment, please refer to Figure 1 In order to separate and collect the dried powder product, the equipment also includes a cyclone separator 9. The bottom of the material cylinder mechanism 4 is provided with a discharge port 403, which is connected to the cyclone separator 9 through a pipe.

[0037] As a preferred embodiment, please refer to Figure 1 In order to monitor the drying process inside the cylinder mechanism 4 in real time, an observation window 7 is provided on the cylinder wall of the cylinder mechanism 4.

[0038] As a preferred embodiment, please refer to Figure 1 In order to support the material cylinder mechanism 4 and facilitate operation and movement, the equipment also includes a frame 1. The bottom of the frame 1 is equipped with casters 2 to enable flexible movement of the equipment. A control console 3 is also fixed on the frame 1 for centralized control of the equipment operation.

[0039] Working principle: When it is necessary to spray dry alumina slurry, the equipment is started through the control console 3. The entire equipment is supported by the frame 1 and moved and positioned by the casters 2. The alumina slurry enters the material cylinder mechanism 4 from the spray nozzle 401, and at the same time, the hot air generated by the hot air distributor 8 enters the inside of the material cylinder mechanism 4 through the air inlet 402.

[0040] The slurry first flows through the collection hood 501 and is guided to the atomizing mechanism 5. At this time, the motor 505 drives the rotating shaft 504 to rotate at high speed, and the support frame 506 provides stable support for the rotating shaft 504. Since the guide groove 604 at the upper end of the rotating shaft 504 is engaged with the guide block 603 at the lower end of the convex connecting shaft 507, the power of the rotating shaft 504 is accurately transmitted to the convex connecting shaft 507, causing it to rotate synchronously at high speed. The convex connecting shaft 507 first drives the high-pressure shearing atomizing disk 502 above it to rotate, performing primary shearing and crushing on the incoming slurry and breaking up the agglomerated particles in the slurry. Subsequently, the initially crushed slurry enters the centrifugal atomizing disk 503 below under the action of gravity and centrifugal force, and the centrifugal atomizing disk 503 completes the secondary fine atomization, throwing the slurry out to form uniform droplets.

[0041] The atomized droplets come into full contact with the hot air from the air inlet 402 inside the material cylinder mechanism 4, and the moisture evaporates rapidly to achieve drying. The drying process can be monitored in real time through the observation window 7. The dried alumina particles and the mixture of exhaust gas are discharged from the discharge port 403 at the bottom of the material cylinder mechanism 4 and enter the cyclone separator 9 for gas-solid separation to collect the finished powder.

[0042] When it is necessary to replace or clean the worn high-pressure shear atomizing disc 502 and centrifugal atomizing disc 503, the operator only needs to rotate the eccentric threaded bolt 601 of the quick-release mechanism 6 to loosen the nut 602; the two semi-circular ring retainers 607 rotatably connected to the convex connecting shaft 507 can be opened, and the convex ring 605 on the inner wall of the retainer 607 will disengage from the annular groove 606 on the outer wall of the rotating shaft 504, releasing the axial lock on the convex connecting shaft 507; at this time, the convex connecting shaft 507, together with the guide block 603, the high-pressure shear atomizing disc 502 and the centrifugal atomizing disc 503 on it, can be lifted vertically upward as a whole, so that the guide block 603 disengages from the guide groove 604, thereby realizing the quick disassembly and maintenance of the entire atomizing core component.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A spray dryer for alumina slurry, comprising: The cylinder mechanism (4) and the atomizing mechanism (5) disposed within the cylinder mechanism (4) include a motor (505) and a rotating shaft (504) driven by the motor (505). The atomizing mechanism (5) is characterized in that it further includes a convex connecting shaft (507), and a high-pressure shearing atomizing disk (502) and a centrifugal atomizing disk (503) fixedly connected to the convex connecting shaft (507). The high-pressure shearing atomizing disk (502) is arranged above the centrifugal atomizing disk (503) along the axial direction of the convex connecting shaft (507). The atomizing mechanism (5) also includes a quick-release mechanism (6) for detachably connecting the convex connecting shaft (507) to the rotating shaft (504). A guide block (603) is connected to the lower end face of the convex connecting shaft (507), and a guide groove (604) is provided on the upper end face of the rotating shaft (504) to engage with the guide block (603). The quick-release mechanism (6) includes a retaining ring (607), which includes two semicircular rings that can be opened and closed. The semicircular rings are rotatably connected to the outer wall of the convex connecting shaft (507) and are detachably locked with a nut (602) by an eccentric threaded bolt (601) provided on its edge. The inner wall of the retaining ring (607) is provided with a convex ring (605), and the outer wall of the rotating shaft (504) is provided with an annular groove (606) that cooperates with the convex ring (605).

2. The spray dryer for alumina slurry according to claim 1, characterized in that, The atomizing mechanism (5) also includes a liquid collection hood (501), which is annular and located between the high-pressure shearing atomizing disc (502) and the spray port (401) of the barrel mechanism (4).

3. The spray dryer for alumina slurry according to claim 1, characterized in that, The atomizing mechanism (5) also includes a support frame (506), which is fixedly connected to the inside of the material cylinder mechanism (4) and provides support for the rotating shaft (504).

4. The spray dryer for alumina slurry according to claim 1, characterized in that, The spray dryer also includes a hot air distributor (8), and the upper side wall of the material cylinder mechanism (4) is provided with an air inlet (402) that communicates with the hot air distributor (8).

5. The spray dryer for alumina slurry according to claim 1, characterized in that, The spray dryer also includes a cyclone separator (9), and the bottom of the material cylinder mechanism (4) is provided with a discharge port (403), which is connected to the cyclone separator (9) through a pipe.

6. The spray dryer for alumina slurry according to claim 1, characterized in that, An observation window (7) is provided on the cylinder wall of the material cylinder mechanism (4).

7. The spray dryer for alumina slurry according to claim 1, characterized in that, The spray dryer also includes a frame (1) for supporting the barrel mechanism (4).

8. The spray dryer for alumina slurry according to claim 7, characterized in that, The bottom of the frame (1) is equipped with casters (2).

9. The spray dryer for alumina slurry according to claim 7, characterized in that, The spray dryer also includes a control console (3) fixed to the frame (1).

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