A rotary flash crystallization apparatus for magnesium sulfate

Abstract

This invention belongs to the field of crystallization technology, specifically a rotary flash crystallization apparatus for magnesium sulfate. The proposed solution includes a vessel body with detachable lids at both ends. Multiple heating elements are installed inside the lids, which are connected to an inlet pipe and an outlet pipe. The vessel body is placed horizontally, and an exhaust pipe is connected to the top. Scrapers are slidably connected to the inner walls of both sides of the vessel body. These scrapers reciprocate around the circumference of the vessel body, moving in opposite directions and colliding at a point between the top and bottom of the vessel body. This invention improves the cleaning effect of debris from the crystallizing portion of the vessel body's inner wall through a combination of collision vibration and scraping, preventing crystals from remaining on the scraper surface as they move. Furthermore, the collision vibration of the scrapers on both sides improves the dispersion effect of the surrounding solution to prevent crystallization, thereby improving the efficiency of flash crystallization.

Description

Technical Field

[0001] This invention relates to the field of crystallization technology, and more particularly to a rotary flash crystallization apparatus for magnesium sulfate. Background Technology

[0002] Magnesium sulfate monohydrate is usually produced by crystallizing magnesium sulfate solution after heating it in a reaction vessel.

[0003] Chinese patent publication number CN108383141A discloses a magnesium sulfate monohydrate evaporation and crystallization device. The device includes a raw liquid preheating system, an evaporation and crystallization system, a filtration and separation system, and a drying and packaging system connected in sequence. It also includes a control unit for controlling the raw liquid preheating system, the evaporation and crystallization system, the filtration and separation system, and the drying and packaging system.

[0004] However, during the heating and evaporation process inside the reactor, crystals easily form on the surface of the reactor body, affecting production. Existing technologies, which rely solely on scrapers, are insufficient to effectively remove the crystals from the inner wall surface. Summary of the Invention

[0005] Based on the technical problems in the background art, the present invention proposes a magnesium sulfate rotary flash crystallization apparatus.

[0006] The present invention proposes a rotary flash crystallization apparatus for magnesium sulfate, comprising a vessel body, both ends of which are detachably connected to a vessel lid. Multiple heating elements are installed inside the vessel lid, and an inlet pipe and an outlet pipe are connected to the vessel lid. The vessel body is placed horizontally, and an exhaust pipe is connected to the top of the vessel body. Scrapers are slidably connected to the inner walls on both sides of the vessel body. The scrapers reciprocate around the circumference of the vessel body, and the two scrapers move in opposite directions, colliding at the middle position between the top and bottom of the vessel body.

[0007] Preferably, both sides of the scraper are provided with multiple grooves, and the ends of the scraper are located adjacent to the grooves to form protrusions, with the grooves and protrusions between the corresponding ends of the two scrapers corresponding to each other.

[0008] Preferably, a fixing pipe is horizontally installed at the axial center of the vessel body, and both ends of the fixing pipe are fixed to the vessel lid. Both ends of the outer wall of the fixing pipe are rotatably connected to a rotating cylinder, and the two rotating cylinders correspond to two scrapers respectively. A connecting frame is connected between the rotating cylinders and the corresponding scrapers.

[0009] Preferably, two connecting blocks are fixed at one end of the connecting frame near the scraper. A limiting slide rail is installed on the inner wall of the scraper at the position corresponding to the connecting block. The connecting block slides within the limiting slide rail and a spring is connected between the connecting block and the limiting slide rail.

[0010] Preferably, a gear is fixed to the end of the outer wall of the rotating drum near the middle position of the fixed tube. A lifting frame is vertically raised and lowered on one side of the gear. The lifting frame is equipped with a vertically placed sliding bar and a driving bar. Limiting frames are installed at the middle positions of both sides of the fixed tube. The sliding bar slides vertically within the limiting frame. The driving bar meshes with the corresponding gear. The lifting frame meshing with the gear is located on the side of the corresponding rotating drum away from the connecting frame.

[0011] Preferably, a mounting bracket is fixed between the top and bottom of each of the two lifting frames, and a spring is connected between the mounting bracket and the fixed tube. Electromagnetic blocks are installed at the top and bottom of the fixed tube at positions corresponding to the mounting brackets. When the electromagnetic blocks are energized, they are magnetically attracted to the mounting brackets.

[0012] Preferably, multiple through slots are provided above and below the side of the scraper, and a stirring element is rotatably arranged on the side of the through slot away from the middle of the scraper, and the cross-section of the stirring element is set in a V-shaped structure.

[0013] Preferably, the mixing component is provided with an extrusion plate and a mixing plate. The extrusion plate is located between the groove and the mixing plate. A shaft is fixed between the extrusion plate and the mixing plate. Both ends of the shaft are rotatably connected to a bearing seat by a torsion spring. The bearing seat is fixed to the scraper. Under normal conditions, the positions of the extrusion plate and the mixing plate away from the shaft are inclined towards the direction of the fixed tube.

[0014] Preferably, the extrusion plate has multiple perforations, and a collision rod is slidably connected to the inner wall of the perforation. A spring is connected between the end of the collision rod and the extrusion plate.

[0015] Preferably, the length of the stirring plate is greater than the length of the extrusion plate, and the outer wall of the stirring plate is provided with multiple through-grooves. The extension direction of the grooves is perpendicular to the shaft. A slider is limited and slidable in the groove. A rotating shaft is rotatably connected in the middle of the slider. Rotating plates are fixed at both ends of the rotating shaft.

[0016] The beneficial effects of this invention are as follows:

[0017] In this invention, the scrapers on both sides will collide and come into contact at the middle position of the top and bottom of the vessel during the reciprocating rotation. The collision vibration combined with the scraping improves the cleaning effect of the broken material on the crystallized part of the inner wall of the vessel, and prevents the crystals from remaining on the scraper surface as the scrapers move. Furthermore, the collision vibration of the scrapers on both sides improves the dispersion effect of the surrounding solution to avoid crystallization, thereby improving the flash crystallization operation effect.

[0018] In this invention, the alternating energization of two electromagnetic blocks enables the lifting frames on both sides to move up and down synchronously, and the scrapers on both sides to rotate downward or upward simultaneously. The lifting operation of the lifting frames guides the flow in the middle of the vessel, and the lifting frames and scrapers move in opposite directions in the vertical direction, creating a difference in flow between the middle of the vessel and the sides, thereby improving the interaction effect of the liquid flow in the horizontal direction and further improving the efficiency of flash crystallization.

[0019] In this invention, when the extrusion plate deflects in the direction of the groove, multiple dispersed collision rods are used to impact the inner wall of the reactor to improve the cleaning effect of crystals adhering to the inner wall of the reactor, and the slider and rotating plate can move along the direction of the groove to disperse the liquid flow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a magnesium sulfate rotary flash crystallization apparatus proposed in this invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the reactor body of a magnesium sulfate rotary flash crystallization apparatus proposed in this invention;

[0022] Figure 3 This is a schematic diagram of the vessel lid position structure of a magnesium sulfate rotary flash crystallization apparatus proposed in this invention;

[0023] Figure 4 This is a schematic diagram of the scraper distribution structure of a magnesium sulfate rotary flash crystallization device proposed in this invention;

[0024] Figure 5 This is a schematic diagram of the scraper position structure of a magnesium sulfate rotary flash crystallization device proposed in this invention;

[0025] Figure 6 This is a schematic diagram of the limiting slide rail position structure of a magnesium sulfate rotary flash crystallization device proposed in this invention;

[0026] Figure 7 This is a schematic diagram of the lifting frame structure of a magnesium sulfate rotary flash crystallization apparatus proposed in this invention;

[0027] Figure 8 This is a schematic diagram of the trough position structure of a magnesium sulfate rotary flash crystallization apparatus proposed in this invention;

[0028] Figure 9 This is a schematic diagram of the stirring component structure of a magnesium sulfate rotary flash crystallization device proposed in this invention.

[0029] In the diagram: 1. Cauldron body, 2. Base, 3. Cauldron lid, 4. Heating element, 5. Inlet pipe, 6. Outlet pipe, 7. Exhaust pipe, 8. Scraper, 801. Groove, 802. Protrusion, 9. Fixing pipe, 10. Rotary cylinder, 11. Connecting frame, 111. Connecting block, 12. Limiting slide rail, 13. Spring 1, 14. Gear, 15. Lifting frame, 16. Limiting frame, 17. Mounting frame, 18. Spring 2, 19. Electromagnetic block, 20. Through groove, 21. Stirring element, 211. Extrusion plate, 212. Stirring plate, 22. Shaft, 23. Shaft seat, 24. Collision rod, 25. Spring 3, 26. Slide groove, 27. Slider, 28. Rotating shaft, 29. Rotating plate. Detailed Implementation

[0030] Example 1: Refer to Figures 1-7 A rotary flash crystallization apparatus for magnesium sulfate includes a vessel body 1, with a base 2 for support at the bottom of the vessel body 1. Both ends of the vessel body 1 are detachably connected to a vessel lid 3. Multiple heating elements 4 are installed inside the vessel lid 3. An inlet pipe 5 and an outlet pipe 6 are connected to the vessel lid 3, with the inlet pipe 5 located above the vessel lid 3 and the outlet pipe 6 located below the vessel lid 3. The axis of the vessel body 1 is horizontally positioned. An exhaust pipe 7 is connected to the top of the vessel body 1. Electromagnetic valves are installed on the inlet pipe 5, the outlet pipe 6, and the exhaust pipe 7. Scrapers 8 are slidably connected to the inner walls of both sides of the vessel body 1. The scrapers 8 reciprocate around the circumference of the vessel body 1, and the two scrapers 8 move in opposite directions. The magnesium sulfate solution is introduced into the reactor body 1 through the collision between the top and bottom middle positions of the reactor body 1 and heated by the heating element 4 to achieve flash crystallization. During the heating process, the scrapers 8 on both sides reciprocate, not only cleaning the surface of the reactor body 1, but also colliding at the middle position between the top and bottom of the reactor body 1 during the reciprocating rotation of the scrapers 8. The collision vibration combined with the scraping improves the cleaning effect of the fragments in the crystallized part of the reactor body 1, and prevents crystals from remaining on the surface of the scrapers 8 as they move. In addition, the collision vibration of the scrapers 8 on both sides improves the dispersion effect of the solution in the outer area to prevent crystallization, thereby improving the flash crystallization operation effect.

[0031] In this invention, multiple grooves 801 are provided on both sides of the scraper 8. The end of the scraper 8 is positioned adjacent to the grooves 801 to form a protrusion 802. The grooves 801 and protrusions 802 between the corresponding ends of the two scrapers 8 are positioned to correspond, so that when the ends of the two scrapers 8 come into contact and collide, the protrusion 802 at the end of one scraper 8 will be inserted into the groove 801 at the end of the other scraper 8. This achieves collision vibration and disperses the vibration force by extending the protrusion 802 into the groove 801. Furthermore, the protrusions 802 and grooves 801 spaced apart at the end of the same scraper 8 guide and disperse the liquid flow during the rotation of the scraper 8, preventing the scraped crystals from always being flatly attached to the end of the scraper 8 and moving with it. Instead, the crystals are dispersed and guided to move axially in the reactor body 1, thereby further improving the working effect.

[0032] In this invention, a fixed tube 9 is horizontally installed at the axial center of the vessel body 1. Both ends of the fixed tube 9 are fixed to the vessel cover 3. Both ends of the outer wall of the fixed tube 9 are rotatably connected to a rotating cylinder 10 via bearings. The two rotating cylinders 10 correspond to two scrapers 8 respectively. A connecting frame 11 connects the rotating cylinder 10 and the corresponding scraper 8. It should be noted that only two connecting frames 11 are provided inside the vessel body 1. The two ends of the connecting frame 11 are connected to one scraper 8 and one rotating cylinder 10 respectively. The connecting frames 11 of the two rotating cylinders 10 are located on both sides of the fixed tube 9, that is, one rotating cylinder 10 rotates with the corresponding scraper 8. This drives the two rotating cylinders 10 to rotate back and forth in the same direction with the corresponding scraper 8 and achieve collision. The fixed tube 9 is set as a tube body, and additional heating units can be inserted into the fixed tube 9 as needed to improve the heating efficiency.

[0033] In this invention, the end of the connecting frame 11 is fixed to the outer wall of the rotating drum 10. Two connecting blocks 111 are fixed to one end of the connecting frame 11 near the scraper 8. An arc-shaped limiting slide rail 12 is installed on the inner wall of the scraper 8 at the position corresponding to the connecting block 111. The connecting block 111 slides within the limiting slide rail 12. Springs 13 are connected between the top and bottom of the connecting block 111 and the limiting slide rail 12. When the rotating drum 10 rotates the scraper 8, there is enough space between the scraper 8 and the connecting frame 11. After the two scrapers 8 collide, the rotating drum 10 can continue to rotate a short distance, so that the rotating drum 10 can rotate at a large angle to ensure the collision effect between the scrapers 8.

[0034] In this invention, a gear 14 is fixed to the end of the outer wall of the rotating drum 10 near the middle of the fixed tube 9. A lifting frame 15 is vertically and vertically mounted on one side of the gear 14. It should be noted that there are only two lifting frames 15, and the two lifting frames 15 are distributed on both sides of the fixed tube 9. The lifting frame 15 is provided with a vertically placed sliding bar and a driving bar. The top and bottom ends of the sliding bar and the driving bar are fixedly connected. Limiting frames 16 are installed at the middle of both sides of the fixed tube 9. The sliding bar slides vertically within the limiting frame 16. Multiple toothed blocks that mesh with the corresponding gear 14 are installed on the side of the driving bar. The lifting frame 15 that meshes with the gear 14 is located on the side of the corresponding rotating drum 10 away from the connecting frame 11. That is, when the lifting frame 15 moves downward, it will cause the scraper 8 connected by the rotating drum 10 and the connecting frame 11 to rotate upward. Conversely, when the lifting frame 15 moves upward, it will cause the scraper 8 to rotate downward. This makes the lifting frame 15 and the scraper 8 staggered in the vertical direction, avoiding the lifting frame 15 from affecting the rotation of the scraper 8 and causing collision.

[0035] In this invention, mounting brackets 17 are fixed between the top and bottom of the two lifting frames 15. A spring 18 connects the mounting bracket 17 to the fixed pipe 9. Electromagnetic blocks 19 are installed at the top and bottom of the fixed pipe 9 corresponding to the mounting brackets 17. When the electromagnetic blocks 19 are energized, they are magnetically attracted to the mounting brackets 17. Thus, by alternately energizing the two electromagnetic blocks 19, the lifting frames 15 on both sides can be synchronously raised and lowered. The synchronous raising and lowering of the lifting frames 15 on both sides can make the scrapers 8 on both sides rotate downward or upward at the same time, thereby ensuring the effectiveness of the drive. Furthermore, the lifting operation of the lifting frames 15 guides the flow in the middle position of the vessel body 1. The lifting frames 15 and the scrapers 8 move in opposite directions in the vertical direction, which makes the flow difference between the middle position and the sides of the vessel body 1, thereby improving the interaction effect of the liquid flow in the horizontal direction, thereby further improving the efficiency of flash crystallization. Compared with directly using a motor drive, this can effectively reduce the damage to the motor caused by collision.

[0036] Example 2: Refer to Figures 1-9 A magnesium sulfate rotary flash crystallization apparatus, based on Example 1, has multiple through slots 20 on the upper and lower sides of the scraper 8. A stirring element 21 is rotatably mounted on the side of the through slot 20 away from the center of the scraper 8. The stirring element 21 has a V-shaped cross-section and includes an extrusion plate 211 and a stirring plate 212. The extrusion plate 211 is located between the through slots 20 and the stirring plate 212. A horizontally placed shaft 22 is fixed at the connection between the extrusion plate 211 and the stirring plate 212. The shaft 22 is parallel to the fixed tube 9. Both ends of the shaft 22 are rotatably connected to shaft seats 23 via torsion springs. The shaft seats 23 are fixed to the scraper 8. Under normal conditions, the extrusion plate 211 and the stirring plate 212 are away from the shaft. The rods 22 are all tilted towards the fixed tube 9. During use, when the scraper 8 rotates downwards and has not yet collided, the lower stirring element 21 deflects towards the through groove 20 under inertia, and the upper stirring element 21 deflects away from the through groove 20 under inertia. When a collision occurs, the bottom ends of the two scrapers 8 collide, and the stirring element 21 above the scraper 8 deflects towards the through groove 20 under inertia and passes through the through groove to collide with the inner wall of the vessel 1. The dispersed impact force improves the destructive cleaning effect on the crystals on the inner wall of the vessel 1. Conversely, when the two scrapers 8 rotate upwards and collide, the lower stirring element 21 collides with the inner wall of the vessel 1 under inertia towards the through groove 20.

[0037] In this invention, the extrusion plate 211 has multiple perforations, and collision rods 24 are slidably connected to the inner wall of the perforations. A spring 25 is connected between the end of the collision rod 24 and the extrusion plate 211, so that when the extrusion plate 211 deflects in the direction of the perforation groove 20, the multiple dispersed collision rods 24 impact the inner wall of the reactor body 1, thereby improving the cleaning effect of the crystals adhering to the inner wall of the reactor body 1.

[0038] In this invention, the length of the stirring plate 212 is greater than the length of the extrusion plate 211. The outer wall of the stirring plate 212 is provided with multiple through-grooves 26. The extension direction of the grooves 26 is perpendicular to the shaft 22. A slider 27 is slidably limited inside the groove 26. A through hole is provided in the middle of the slider 27. A rotating shaft 28 is rotatably connected to the inner wall of the through hole. Rotating plates 29 are fixed at both ends of the rotating shaft 28. During the reciprocating deflection of the scraper 8, the slider 27 and the rotating plates 29 can move along the direction of the groove 26 to disperse the liquid flow. When the two scrapers 8 collide, the slider 27 and the rotating plates 29 on the scraper 8 will quickly turn to disperse the liquid flow, thereby improving the dispersion effect of the liquid flow and thus improving the flash crystallization efficiency.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rotary flash crystallization apparatus for magnesium sulfate, comprising a vessel body (1), both ends of which are detachably connected to a vessel lid (3), a plurality of heating elements (4) are installed on the inner side of the vessel lid (3), and an inlet pipe (5) and an outlet pipe (6) are connected to the vessel lid (3), characterized in that, The vessel body (1) is placed horizontally, and an exhaust pipe (7) is connected to the top of the vessel body (1). Scrapers (8) are slidably connected to the inner walls of both sides of the vessel body (1). The scrapers (8) reciprocate around the circumference of the vessel body (1), and the two scrapers (8) move in opposite directions. The two scrapers (8) collide at the middle position between the top and bottom of the vessel body (1). Multiple grooves (801) are provided on both sides of the scrapers (8). The ends of the scrapers (8) are located at the adjacent positions of the grooves (801) to form protrusions (802). The grooves (801) between the corresponding ends of the two scrapers (8) correspond to the protrusions (802). A fixing pipe (9) is horizontally installed at the axial position of the vessel body (1). The two ends of the fixing pipe (9) are fixed to the vessel cover (3). Rotary cylinders (10) are rotatably connected to both ends of the outer wall of the fixing pipe (9). The two rotating cylinders (10) are respectively connected to the two scrapers (8). Correspondingly, a connecting frame (11) is connected between the rotating drum (10) and the corresponding scraper (8); multiple through slots (20) are provided above and below the side of the scraper (8), and a stirring element (21) is rotatably provided on the side of the through slot (20) away from the middle position of the scraper (8). The cross section of the stirring element (21) is set in a V-shaped structure. The stirring element (21) is provided with a pressing plate (211) and a stirring plate (212). The pressing plate (211) is located between the through slot (20) and the stirring plate (212). A shaft (22) is fixed between the pressing plate (211) and the stirring plate (212). Both ends of the shaft (22) are rotatably connected to a bearing seat (23) through a torsion spring. The bearing seat (23) is fixed to the scraper (8). Under normal conditions, the positions of the pressing plate (211) and the stirring plate (212) away from the shaft (22) are inclined towards the direction of the fixed tube (9).

2. The magnesium sulfate rotary flash crystallization apparatus according to claim 1, characterized in that, Two connecting blocks (111) are fixed at one end of the connecting frame (11) near the scraper (8). A limiting slide rail (12) is installed on the inner wall of the scraper (8) at the position corresponding to the connecting block (111). The connecting block (111) slides within the limiting slide rail (12). A spring (13) is connected between the connecting block (111) and the limiting slide rail (12).

3. The magnesium sulfate rotary flash crystallization apparatus according to claim 1, characterized in that, A gear (14) is fixed at the end of the outer wall of the rotating drum (10) near the middle position of the fixed tube (9). A lifting frame (15) is vertically raised and lowered on one side of the gear (14). The lifting frame (15) is provided with a vertically placed sliding bar and a driving bar. Limiting frames (16) are installed at the middle positions on both sides of the fixed tube (9). The sliding bar slides vertically in the limiting frame (16). The driving bar meshes with the corresponding gear (14). The lifting frame (15) meshing with the gear (14) is located on the side of the corresponding rotating drum (10) away from the connecting frame (11).

4. The magnesium sulfate rotary flash crystallization apparatus according to claim 3, characterized in that, A mounting bracket (17) is fixed between the top and bottom of the two lifting frames (15). A spring (18) is connected between the mounting bracket (17) and the fixed tube (9). Electromagnetic blocks (19) are installed at the top and bottom of the fixed tube (9) at positions corresponding to the mounting bracket (17). When the electromagnetic blocks (19) are energized, they are magnetically attracted to the mounting bracket (17).

5. A rotary flash crystallization apparatus for magnesium sulfate according to any one of claims 1 to 4, characterized in that, The extrusion plate (211) has multiple perforations, and a collision rod (24) is slidably connected to the inner wall of the perforation. A spring (25) is connected between the end of the collision rod (24) and the extrusion plate (211).

6. A rotary flash crystallization apparatus for magnesium sulfate according to any one of claims 1 to 4, characterized in that, The length of the stirring plate (212) is greater than the length of the extrusion plate (211). The outer wall of the stirring plate (212) is provided with multiple through-grooves (26). The extension direction of the grooves (26) is perpendicular to the shaft (22). A slider (27) is limited and slidable inside the groove (26). A rotating shaft (28) is rotatably connected in the middle of the slider (27). Rotating plates (29) are fixed at both ends of the rotating shaft (28).

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