A centrifugal dewatering experimental device

Abstract

The utility model relates to a centrifugal dewatering experimental device, centrifugal dewatering experimental device includes support, drum, sprays the column, rotary plug and drive assembly, the drum with support swing joint, is provided with the sieve hole on its lateral wall, sprays the column in the drum, one end with the drum bottom swing joint, is set up on the end far from the drum bottom and has the insertion hole, the insertion hole lateral wall has a plurality of through spray holes, rotary plug with the insertion hole insertion, and through the metering pump loose agent's storage liquid tank is connected, drive assembly is connected with drum and sprays the column drive respectively, is used for driving drum and sprays the column and rotates respectively to the opposite direction. The centrifugal dewatering experimental device can be the optimal loose agent addition scheme screened out for industrial production.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, and in particular relates to a centrifugal dehydration experimental device. Background Technology

[0002] In chemical, mining, and environmental protection fields, centrifugal dehydration is often used to pretreat wet solid materials such as sodium sulfate. If the wet sodium sulfate after centrifugal dehydration clumps severely, it will directly lead to a series of problems in the subsequent fluidized bed drying process, such as "dead bed," low drying efficiency, increased energy consumption, and unstable product quality.

[0003] To address the issue of wet nitrate caking, adding a loosening agent has become a crucial process. Current methods for adding loosening agents generally involve mixing the agent with the material before centrifugation or spraying the dehydrated wet nitrate after centrifugation. The former method, because the material is not yet fully separated, makes it difficult to achieve a uniform distribution of the loosening agent on the particle surface; the latter method, because the wet nitrate has partially caked, makes it difficult for the sprayed liquid to penetrate, resulting in limited anti-caking effectiveness. Therefore, adding a loosening agent during centrifugation, utilizing centrifugal force to ensure sufficient contact between the loosening agent and the wet nitrate, can solve the aforementioned problems.

[0004] However, the effectiveness of loosening agents, especially their dosage and uniform distribution in a centrifugal field, is the core factor determining the success of anti-caking. The need for precise control over loosening agent dosage, spraying speed, and uniform distribution in a centrifugal field makes it difficult to systematically explore the quantitative relationship between loosening agent process parameters and material flowability, agglomeration rate, and drying efficiency, thus hindering the determination of the optimal addition scheme in industrial production. Utility Model Content

[0005] In view of this, the present invention provides a centrifugal dehydration experimental device to solve the problem that it is difficult to determine the relationship between the amount of loosening agent and the spraying speed and agglomeration during the wet nitrate centrifugal dehydration process.

[0006] To achieve the above objectives, the technical solution of this utility model is to provide a centrifugal dehydration experimental device, comprising: a support, a rotating drum, a spray column, a rotary plug, and a drive assembly; the rotating drum is rotatably connected to the support, and its side wall is provided with sieve holes; the spray column is located inside the rotating drum, one end of which is rotatably connected to the bottom of the rotating drum, and the end away from the bottom of the rotating drum is provided with an insertion hole, the side wall of which has multiple through spray holes; the rotary plug is inserted into the insertion hole and connected to a storage tank of loosening agent through a metering pump; the drive assembly is respectively connected to the rotating drum and the spray column for driving the rotating drum and the spray column to rotate in opposite directions.

[0007] In one optional embodiment, the bottom of the drum has a second through hole, and an annular connecting post is provided on the side away from the opening. The annular connecting post extends away from the opening of the drum and is concentric with the second through hole. The end of the spray column away from the insertion hole is rotatably engaged with the second through hole and extends away from the opening of the drum to the outside of the annular connecting post. The drive assembly is drivenly connected to the annular connecting post and the spray column extending to the outside of the annular connecting post.

[0008] In an alternative embodiment, the drive assembly includes a first drive member and a second drive member, the first drive member being drivenly connected to the annular connecting post, and the second drive member being drivenly connected to the spray column extending outside the annular connecting post.

[0009] In one optional embodiment, a drive gear is provided on the output shaft of the first drive member, a driven gear is sleeved and fixed on the outer circumference of the annular connecting column, the drive gear and the driven gear mesh with each other, and the output shaft of the second drive member is connected to the end of the spray column extending out of the annular connecting column.

[0010] In an optional embodiment, an annular groove is provided on the side of the second through hole near the opening of the drum, and an annular gasket is provided on the spray column. The annular gasket is located in the annular groove, is adapted to the size of the annular groove, and its height is flush with the annular groove.

[0011] In one optional embodiment, the insertion hole includes an insertion portion and a receiving portion arranged sequentially along the axial direction, the insertion portion and the receiving portion are in communication, and the diameter of the receiving portion is larger than the diameter of the insertion portion; wherein, the spray hole is located on the receiving portion, and the rotary plug is inserted into the insertion portion.

[0012] In an optional embodiment, the centrifugal dehydration experimental apparatus further includes an end cap for closing or opening the opening of the drum. The rotary plug is disposed on one side of the end cap, and a connecting pipe is disposed on the side of the end cap away from the rotary plug. The connecting pipe passes through the end cap and is connected to the rotary plug and the metering pump, respectively.

[0013] In an optional embodiment, the bracket is provided with a first through hole, the drum is located in the first through hole, and its opening has a connecting part extending outward along the circumferential edge, the connecting part forming a rotatable connection with the periphery of the first through hole.

[0014] In one optional embodiment, the bracket includes a support plate, a support leg, an annular baffle plate, and a water guide plate. The first through hole is located on the support plate. One end of the support leg is connected to the support plate. The annular baffle plate is disposed on the side of the support plate near the ground, extends away from the support plate, and surrounds the drum. The water guide plate is connected to the support leg and is located on the side of the annular baffle plate away from the support plate.

[0015] In an optional embodiment, a water-guiding groove is provided on the side of the water-guiding plate near the annular water-baffle plate, for allowing water to flow out along the water-guiding groove in a direction away from the annular water-baffle plate.

[0016] Compared with the prior art, the centrifugal dehydration experimental device provided by this utility model has the following beneficial effects: By setting up an independently driveable and counter-rotating drum and an internal spray column, dynamic and counter-current mixing of loosening agent and wet nitrate material is achieved in the centrifugal force field during centrifugal dehydration, solving the problems of uneven mixing and delayed action in traditional premixing or post-spraying methods. At the same time, with the help of a combination of rotary plug and precision metering pump, continuous, stable and precise quantitative delivery of loosening agent to the rotating system is achieved. The device can flexibly adjust key parameters such as drum speed, spray column speed and loosening agent dosage, providing a dedicated experimental platform for studying the quantitative relationship between loosening agent dosage, spraying speed and material flowability and agglomeration rate, thus enabling the selection of the optimal loosening agent addition scheme for industrial production. Attached Figure Description

[0017] Figure 1 An exploded structural diagram of the centrifugal dehydration experimental device provided by this utility model; Figure 2 for Figure 1 A schematic cross-sectional view of the centrifugal dehydration experimental apparatus; Figure 3 for Figure 1 Schematic diagram showing the positional relationship between the rotary drum and the support frame; Figure 4 for Figure 3 A cross-sectional structural diagram showing the positional relationship between the central drum and the support frame; Figure 5 for Figure 1 Cross-sectional structural view of the central spray column; Figure 6 This is a schematic diagram of the end cap structure of the centrifugal dehydration experimental apparatus; Explanation of reference numerals in the attached figures: 1. Bracket; 11. First through hole; 12. Support plate; 13. Support leg; 14. Annular baffle plate; 15. Water guide plate; 2. Drum; 21. Screen hole; 22. Connecting part; 23. Second through hole; 24. Annular connecting column; 241. Driven gear; 3. Spray column; 31. Insertion hole; 311. Spray hole; 301. Insertion part; 302. Receiving part; 32. Annular gasket; 4. Rotary plug; 5. Drive assembly; 51. First drive component; 52. Second drive component; 6. End cap; 61. Connecting pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] like Figures 1 to 2 As shown, this application provides a centrifugal dehydration experimental device, which includes: a support 1, a rotating drum 2, a spray column 3, a rotary plug 4, and a drive assembly 5; The drum 2 is rotatably connected to the support 1, and a sieve hole 21 is provided on its side wall; The spray column 3 is located inside the rotating drum 2. One end of it is rotatably connected to the bottom of the rotating drum 2, and the end away from the bottom of the rotating drum 2 is provided with a plug hole 31. The side wall of the plug hole 31 has multiple through spray holes 311. The rotary plug 4 is inserted into the socket 31 and connected to the storage tank of the loosening agent through the metering pump; The drive assembly 5 is connected to the rotating drum 2 and the spray column 3 respectively, and is used to drive the rotating drum 2 and the spray column 3 to rotate in opposite directions respectively.

[0020] Specifically, the support frame 1 serves as the basic support structure for the entire device, used to fix and support other functional components. The drum 2 is mounted on the support frame 1 and rotates, enabling it to rotate at high speed under the action of the drive component 5. This generates strong centrifugal force, causing the wet solid material to move outward and complete dehydration. Its sidewalls are evenly distributed with sieve holes 21, and the size of the sieve holes can be adjusted according to the particle size of the material, for example, in the range of 0.1 to 2 mm, which ensures that the liquid is discharged smoothly and prevents fine particles from being lost with the filtrate.

[0021] The spray column 3 is partially located inside the rotating drum 2, with one end rotatably connected to the bottom of the drum 2 to ensure stable positioning during rotation, while allowing it to rotate independently under the drive of the drive assembly 5. Multiple spray holes 311 are used to spray the loosening agent outward in the form of atomization or fine stream, so that the loosening agent can be evenly sprayed into the material during the centrifugation process by utilizing the counter-rotation of the drum 2 and the spray column 3.

[0022] Meanwhile, the rotary plug 4 is connected to the insertion hole 31 by rotation to connect the insertion hole 31 and the spray hole 311 on its side wall to the metering pump. The metering pump draws the loosening agent in the storage tank into the insertion hole 31 according to a fixed dosage and sprays it into the material in the centrifuge from the spray hole 311.

[0023] It should be noted that the rotary plug 4 structure, for example, uses mechanical seal or magnetohydrodynamic seal technology to ensure that the fluid passage can still be kept closed in the relative rotation state to prevent leakage, and the size of the screen hole 21 can be set according to the requirements.

[0024] In this embodiment, the spray column 3 is positioned inside the rotating drum 2 and rotates in the opposite direction. Driven by centrifugal force, the loosening agent is sprayed outwards from the center, while the wet nitrate particles move outwards under the same centrifugal force. This creates a counter-shear flow field, significantly improving contact efficiency and distribution uniformity. Simultaneously, the combination of the rotary plug 4 and the metering pump enables continuous supply and precise dosage control of the loosening agent, solving the problems of uneven addition and delayed timing in traditional methods. This not only allows for screening the optimal type and dosage of loosening agent but also enables systematic research on the effects of parameters such as spray rate and rotation speed difference on material flowability, agglomeration rate, and subsequent drying performance, providing reliable experimental evidence and technical support for industrial applications.

[0025] In one embodiment, such as Figure 3 As shown, the bracket 1 is provided with a first through hole 11, the drum 2 is located in the first through hole 11, and its opening has a connecting part 22 extending outward along the circumferential edge. The connecting part 22 is rotatably connected to the periphery of the first through hole 11.

[0026] Specifically, the drum 2 is coaxially arranged with the first through hole 11, and there is a gap between its outer wall and the first through hole 11. The connecting part 22 is located on the side of the support 1 away from the ground, and contacts the periphery of the first through hole 11 to form a rotatable connection. Thus, when the drive assembly 5 provides driving force to the drum 2, the drum 2 can rotate relative to the support 1 by means of the rotatable connection of the connecting part 22 to meet the centrifugal dehydration operation.

[0027] It is understandable that a bearing can be provided on the connecting part 22, and a rotating connection can be formed by the bearing contacting the periphery of the first through hole 11.

[0028] In this embodiment, the first through hole 11 provided on the bracket 1 and the connecting part 22 of the drum 2 form a rotational fit with the periphery of the first through hole 11. Combined with the optional bearing configuration, the drum 2 can maintain good coaxiality and smooth rotation during operation, effectively suppressing the vibration phenomenon caused by loose connection or uneven friction, thereby ensuring the stability and repeatability of the centrifugal dehydration process.

[0029] In one embodiment, such as Figure 4 As shown, the bracket 1 includes a support plate 12, a support leg 13, an annular baffle plate 14, and a water guide plate 15. The first through hole 11 is located on the support plate 12. One end of the support leg 13 is connected to the support plate 12. The annular baffle plate 14 is disposed on the side of the support plate 12 near the ground, extends away from the support plate 12, and surrounds the drum 2. The water guide plate 15 is connected to the support leg 13 and is located on the side of the annular baffle plate 14 away from the support plate 12.

[0030] Specifically, the support legs are distributed around the bottom periphery of the support plate, providing vertical support to keep the entire device stable and off the ground, facilitating drainage and maintenance. The annular baffle 14 forms a closed or nearly closed annular enclosure structure with a gap between it and the rotating drum 2. It is used to block the liquid thrown out from the screen holes 21 during the high-speed rotation of the rotating drum 2, and under the action of gravity, the liquid falls along the inner wall of the annular baffle 14 onto the lower water guide plate 15, and then the liquid is drawn out through the water guide plate 15.

[0031] It should be noted that the gap between the annular baffle plate 14 and the rotating drum 2 must be such that it does not interfere with the rotation of the rotating drum 2, and can also block the liquid thrown out from the screen hole 21 during high-speed rotation.

[0032] The cross-section of the annular baffle 14 can be a right angle, an L-shape, or an inclined structure with a certain angle, so as to guide the liquid to flow in a specified direction. Its height should be sufficient to cover the maximum liquid throwing range of the area where the screen holes 21 on the side wall of the drum 2 are located.

[0033] Furthermore, a water inlet groove (not shown in the figure) is provided on the side of the water inlet plate 15 near the annular baffle plate 14, which is used to allow water to flow out of the water inlet plate 15 along the water inlet groove in a direction away from the annular baffle plate 14.

[0034] It is understandable that there can be multiple water channels, and their shape can be arbitrary, as long as they can guide the water dripping from the annular baffle 14 to the water channel 15 in a direction away from the annular baffle 14.

[0035] In this embodiment, by placing the annular baffle 14 within the main liquid splash area, most of the splashed liquid can be intercepted in time, and its structure guides it downwards, thereby significantly reducing the phenomenon of liquid scattering everywhere. This not only improves the safety and cleanliness of the device operation but also reduces the workload of subsequent cleaning and maintenance.

[0036] In one embodiment, a second through hole 23 is provided at the bottom of the drum 2, and an annular connecting post 24 is provided on the side away from the opening. The annular connecting post 24 extends away from the opening of the drum 2 and is concentric with the second through hole 23. The end of the spray column 3 away from the insertion hole 31 is rotatably engaged with the second through hole 23 and extends out of the annular connecting column 24 in a direction away from the opening of the drum 2; The drive assembly 5 is connected to the annular connecting post 24 and the spray column 3 extending outside the annular connecting post 24.

[0037] Specifically, the annular connecting column 24 is fixed to the outer bottom of the rotating drum 2, forming a downwardly extending cylindrical structure. One end of the spray column 3 is rotatably engaged with the second through hole 23 through a bearing or other rotating component, allowing the spray column 3 to rotate freely relative to the rotating drum 2 while ensuring that its axis coincides with the rotation axis of the rotating drum 2. After one end of the spray column 3 extends downward, passing through the internal space of the annular connecting column 24 and then being exposed, the drive assembly 5 is connected to the outer wall of the annular connecting column 24 and the extended end of the spray column 3 through gears, belts, or other transmission methods, thereby independently transmitting power to the rotating drum 2 and the spray column 3, driving them to rotate in opposite directions.

[0038] It should be noted that the annular connecting column 24 and the rotating drum 2 can be manufactured as a single piece, or they can be fixed together by welding, bolting, or other methods. Their core function is to provide a reliable power input interface for the drive assembly 5. The rotational fit between the spray column 3 and the second through hole 23 can be achieved using different types of bearings, such as deep groove ball bearings, needle roller bearings, or sliding bearings (e.g., copper bushings), supplemented by mechanical seals or packing seals to prevent liquid leakage from the gaps. The transmission method between the drive assembly 5 and the two components is not limited to gear transmission; it can also be achieved using synchronous belt transmission, chain transmission, etc. The power source can be a single motor with a differential mechanism for power distribution, or two independent motors driving each component separately.

[0039] In this embodiment, by setting an annular connecting column 24 and placing the drive connection point on the outer bottom of the drum 2, the entire drive system is completely isolated from the working chamber inside the drum 2, preventing the drive component 5 from being contaminated or corroded by materials or liquids, and greatly improving the reliability and service life of the transmission. At the same time, this layout is compact and the power transmission path is direct, effectively ensuring the accuracy and stability of the relative rotational motion between the drum 2 and the spray column 3, and enabling uniform and controllable mixing of the loosening agent and materials in a centrifugal force field.

[0040] In one embodiment, the drive assembly 5 includes a first drive member 51 and a second drive member 52. The first drive member 51 is drivenly connected to the annular connecting post 24, and the second drive member 52 is drivenly connected to the spray column 3 extending outside the annular connecting post 24.

[0041] It is understood that both the first drive component 51 and the second drive component 52 are independent servo motors or stepper motors, and are fixedly installed on the bracket 1 or the foundation. By using two independent first drive components 51 and second drive components 52, the rotational speeds of the drum 2 and the spray column 3 are completely decoupled and precisely controlled independently. This allows for free and stepless adjustment of the dehydration centrifugal force of the drum 2 and the spraying and mixing intensity of the loosening agent in the spray column 3. This provides highly flexible and precise experimental conditions for studying the influence of the key parameter "rotational speed difference" on the uniformity of loosening agent distribution and the final anti-caking effect.

[0042] In one embodiment, a drive gear is provided on the output shaft of the first drive member 51, and a driven gear 241 is sleeved and fixed on the outer circumference of the annular connecting column 24. The drive gear and the driven gear 241 mesh with each other, and the output shaft of the second drive member 52 is connected to the end of the spray column 3 extending out of the annular connecting column 24.

[0043] It should be noted that the transmission method is not limited to gear transmission, and can also be replaced by a combination of synchronous pulley and synchronous belt, or sprocket and chain transmission.

[0044] In one embodiment, such as Figure 5 As shown, the insertion hole 31 includes an insertion portion 301 and a receiving portion 302 arranged sequentially along the axial direction. The insertion portion 301 and the receiving portion 302 are connected, and the diameter of the receiving portion 302 is larger than the diameter of the insertion portion 301. The spray hole 311 is located on the receiving part 302, and the rotating plug 4 is plugged into the insertion part 301.

[0045] Specifically, the insertion part 301 is a channel with a small diameter, the size of which matches the insertion end of the rotary plug 4, to ensure that the two can rotate relative to each other after insertion, while also having good sealing performance to prevent liquid leakage. The receiving part 302 is a chamber with a diameter significantly larger than that of the insertion part 301, and its function is to provide a temporary gathering and buffering space for the loosening agent flowing in from the rotary plug 4. The plurality of spray holes 311 are evenly distributed around the circumference of the receiving part 302, and their axes can be perpendicular to or at a certain angle to the axis of the spray column 3, so that the loosening agent can be evenly and radially thrown out from here under the action of centrifugal force, forming an atomization or fine stream.

[0046] It should be noted that the transition area between the insertion part 301 and the receiving part 302 can be smoothly transitioned using a conical surface or rounded corners to reduce fluid resistance and avoid eddy currents. The length of the insertion part 301 must ensure sufficient mating area with the rotary plug 4 to ensure stability and sealing reliability during rotation. The diameter and volume of the receiving part 302 can be adjusted according to the instantaneous flow rate of the loosening agent required for the experiment. The orifice diameter, number, and distribution angle of the spray holes 311 can be designed and changed according to the required atomization particle size and spray range; for example, a smaller orifice diameter can be used to obtain a better atomization effect.

[0047] In this embodiment, functional partitioning is achieved by designing the insertion hole 31 as a stepped structure of a small-diameter insertion part 301 and a large-diameter receiving part 302. The insertion part 301 focuses on ensuring a reliable seal and stable rotation with the rotary plug 4, while the receiving part 302 serves as an efficient fluid distribution chamber. Its larger space reduces the flow rate of the loosening agent and makes the pressure more uniform, allowing the loosening agent to be sprayed evenly and stably from the circumferentially distributed spray holes 311.

[0048] In one embodiment, the second through hole 23 is provided with an annular groove on the side near the opening of the drum 2, and an annular gasket 32 ​​is provided on the spray column 3. The annular gasket 32 ​​is located in the annular groove, is adapted to the size of the annular groove, and its height is flush with the annular groove.

[0049] Specifically, the annular groove is a ring-shaped groove machined on the inner wall of the second through hole 23. When the spray column 3 is installed in place, the annular gasket 32 ​​is precisely embedded in the annular groove, and there is a gap between it and the side wall of the annular groove.

[0050] Understandably, the engagement of the annular gasket 32 ​​with the annular groove provides a stable and reliable radial auxiliary support point for the high-speed rotating spray column 3, effectively limiting the swaying of the middle section of the spray column 3 and ensuring its concentricity with the drum 2. At the same time, it can also prevent material or water from flowing out from the rotational engagement point between the spray column 3 and the second through hole 23.

[0051] In one embodiment, such as Figure 6 As shown, the centrifugal dehydration experimental device also includes an end cap 6, which is used to close or open the opening of the drum 2. A rotary plug 4 is disposed on one side of the end cap 6. A connecting pipe 61 is disposed on the side of the end cap 6 away from the rotary plug 4. The connecting pipe 61 passes through the end cap 6 and is connected to the rotary plug 4 and the metering pump respectively.

[0052] Specifically, the end cap 6 can be fixed to the bracket 1 to close the opening end of the rotating drum 2. The rotary plug 4 is fixedly embedded in the end face of the end cap 6 facing the inside of the rotating drum 2. The connecting pipe 61 is fixedly installed on the side of the end cap 6 facing away from the rotating drum 2, and its pipeline runs vertically through the cover body of the end cap 6. One end is sealed and connected to the central flow channel of the rotary plug 4, and the other end is connected to the outlet of the external metering pump through a hose or rigid pipe connector. Thus, the loosening agent from the metering pump can flow sequentially through the connecting pipe 61 and the internal flow channel of the rotary plug 4, and finally be delivered to the rotating spray column 3.

[0053] It should be noted that the end cap 6 and the bracket 1 can be fixed by a flange connection, or by a combination of snap-fit ​​or hinge and lock structure, to facilitate quick opening for equipment maintenance, cleaning, or material replacement. Simultaneously, it must be ensured that when the end cap 6 closes the opening of the drum 2, it does not interfere with the rotation of the drum 2. The connecting pipe 61 and the end cap 6 can be integrally formed, or they can be manufactured separately and then connected by welding or threaded sealing. The rotary plug 4 employs a mechanical seal or similar structure to ensure a reliable seal at the connection point with the connecting pipe 61 when the spray column 3 drives it to rotate relative to one side.

[0054] In this embodiment, the open end of the drum 2 is sealed by the end cap 6, forming a safe and airtight chamber. When the drum 2 rotates at high speed for centrifugal dehydration, the end cap 6 can effectively prevent the wet nitrate material from flying out of the open end under the action of centrifugal force, ensuring the safety of the experimental operation and preventing material loss.

[0055] The working principle of this utility model is as follows: When the centrifugal dehydration experimental device is needed for the experiment, firstly, the end cap 6 is opened, a certain amount of wet nitrate material is added into the drum 2, and the spray column 3 is placed inside the drum 2, with one end of it engaging with the annular groove of the second through hole 23 through the annular gasket 32 ​​to achieve radial support and centering, and the other end passing through the second through hole 23 and the annular connecting column 24, extending to the outside of the drum, and forming a transmission connection with the second driving component 52. The end cap 6 is closed and tightened. At this time, the rotary plug 4 (rotary joint) on the end cap 6 is inserted into the insertion part 301 at the top of the spray column 3, forming a sealed and relatively rotatable fluid channel. At the same time, the end cap 6 completely seals the opening of the drum 2 to prevent the material from flying out during the subsequent centrifugation process. The connecting pipe 61 on the end cap 6 is connected to a precision metering pump and a loosening agent storage tank through a pipeline to complete the initial preparation work.

[0056] Next, the first drive unit 51 and the second drive unit 52 are activated. The first drive unit 51, through the meshing of the drive gear and the driven gear 241, drives the annular connecting column 24 and the drum 2 fixed thereto to rotate at high speed in one direction (e.g., clockwise). At the same time, the second drive unit 52 drives the spray column 3 to rotate in the opposite direction (e.g., counterclockwise). The high-speed rotation of the drum 2 generates a strong centrifugal force, causing the wet nitrate material to be thrown against the side wall of the drum and adhere tightly to it to form a filter cake layer. The liquid (mother liquor) in the material penetrates the sieve holes 21 under the action of centrifugal force and is discharged, collected by the annular baffle plate 14 and guided away by the water guide plate 15, completing the dewatering process.

[0057] During this process, the metering pump connected to the connecting pipe 61 is activated, precisely pumping out a predetermined amount of loosening agent. The loosening agent flows through the connecting pipe 61 and the rotary plug 4, enters the insertion part 301 of the spray column 3, and finally flows into the receiving part 302. Under the action of centrifugal force, it is atomized and radially ejected from the spray holes 311 evenly distributed on the periphery of the receiving part 302. Because the spray column 3 and the drum 2 rotate in opposite directions, the sprayed atomized loosening agent and the wet nitrate particles moving outward (radially) under the action of centrifugal force form a highly efficient countercurrent collision and shear mixing. This "dynamic surface modification" process allows the loosening agent to be coated extremely evenly on the surface of each wet nitrate particle.

[0058] Finally, after the dehydration and addition processes are completed, the metering pump, the second drive unit 52, and the first drive unit 51 are stopped sequentially. After the equipment has come to a complete stop, the end cover 6 is opened, and the treated wet nitrate material is removed. At this point, the wet nitrate sample should be loose, non-clumping, and have good flowability due to the uniform coating of the loosening agent. The sample is then analyzed for subsequent parameters such as flowability, moisture content, agglomeration rate, and simulated drying rate. Thus, by changing the operating parameters (such as drum speed, spray column speed, total loosening agent addition, metering pump delivery rate, etc.) and repeating the above process, the influence of each parameter on the quality of the dehydrated wet nitrate can be systematically studied, thereby identifying the optimal type, dosage, and addition rate of loosening agent for a specific material.

[0059] Compared with existing technologies, the centrifugal dehydration experimental device provided by this utility model, by setting up an independently driveable and counter-rotating drum and an internal spray column, realizes dynamic and counter-current mixing of loosening agent and wet nitrate material in the centrifugal force field during the centrifugal dehydration process. At the same time, by using the combination of a rotary plug and a precision metering pump, the loosening agent is continuously, stably and accurately delivered to the rotating system. It can flexibly adjust key parameters such as drum speed, spray column speed and loosening agent addition amount, providing a dedicated experimental platform for systematically studying the quantitative relationship between loosening agent dosage, spraying speed and material flowability and agglomeration rate, thereby enabling the selection of the optimal loosening agent addition scheme for industrial production.

[0060] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A centrifugal dehydration experimental apparatus, characterized in that, include: Support frame, rotating drum, spray column, rotary plug and drive assembly; The drum is rotatably connected to the support, and its side wall is provided with sieve holes; The spray column is located inside the rotating drum, with one end rotatably connected to the bottom of the rotating drum, and an insertion hole is provided on the end away from the bottom of the rotating drum. The side wall of the insertion hole has multiple through spray holes. The rotary plug is inserted into the socket and connected to the storage tank of the loosening agent via a metering pump; The drive assembly is connected to the drum and the spray column respectively, and is used to drive the drum and the spray column to rotate in opposite directions respectively.

2. The centrifugal dehydration experimental apparatus as described in claim 1, characterized in that: The bottom of the drum is provided with a second through hole, and an annular connecting post is provided on the side away from the opening. The annular connecting post extends away from the opening of the drum and is concentric with the second through hole. The end of the spray column away from the insertion hole is rotatably engaged with the second through hole and extends out of the annular connecting column in a direction away from the opening of the drum; The drive assembly is connected to the annular connecting post and the spray column extending outside the annular connecting post.

3. The centrifugal dehydration experimental apparatus as described in claim 2, characterized in that: The drive assembly includes a first drive member and a second drive member. The first drive member is drivenly connected to the annular connecting column, and the second drive member is drivenly connected to the spray column extending outside the annular connecting column.

4. The centrifugal dehydration experimental apparatus as described in claim 3, characterized in that: A drive gear is provided on the output shaft of the first drive member, and a driven gear is sleeved and fixed on the outer circumference of the annular connecting column. The drive gear and the driven gear mesh with each other, and the output shaft of the second drive member is connected to the end of the spray column extending out of the annular connecting column.

5. The centrifugal dehydration experimental apparatus as described in claim 2, characterized in that: The second through hole has an annular groove on the side near the opening of the drum. An annular gasket is provided on the spray column. The annular gasket is located in the annular groove, is adapted to the size of the annular groove, and its height is flush with the annular groove.

6. The centrifugal dehydration experimental apparatus as described in claim 1, characterized in that: The insertion hole includes an insertion part and a receiving part arranged sequentially along the axial direction. The insertion part and the receiving part are in communication, and the diameter of the receiving part is larger than the diameter of the insertion part. The spray hole is located on the receiving part, and the rotating plug is inserted into the plug-in part.

7. The centrifugal dehydration experimental apparatus as described in claim 1, characterized in that: The centrifugal dehydration experimental device also includes an end cap, which is used to close or open the opening of the drum. The rotary plug is disposed on one side of the end cap, and a connecting pipe is disposed on the side of the end cap away from the rotary plug. The connecting pipe passes through the end cap and is connected to the rotary plug and the metering pump respectively.

8. The centrifugal dehydration experimental apparatus as described in claim 1, characterized in that: The bracket is provided with a first through hole, and the drum is located in the first through hole. Its opening has a connecting part that extends outward along the circumferential edge, and the connecting part is rotatably connected to the periphery of the first through hole.

9. The centrifugal dehydration experimental apparatus as described in claim 8, characterized in that, include: The support includes a support plate, a support leg, an annular baffle plate, and a water guide plate. The first through hole is located on the support plate. One end of the support leg is connected to the support plate. The annular baffle plate is disposed on the side of the support plate near the ground, extends away from the support plate, and surrounds the drum. The water guide plate is connected to the support leg and is located on the side of the annular baffle plate away from the support plate.

10. The centrifugal dehydration experimental apparatus as described in claim 9, characterized in that, include: A water-guiding groove is provided on the side of the water-guiding plate near the annular water-baffle plate, which is used to allow water to flow out along the water-guiding groove in a direction away from the annular water-baffle plate.

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