A melt crystallization tower and crystallization method

Abstract

This invention belongs to the field of melt crystallization technology, specifically a melt crystallization tower and crystallization method. Addressing the problem of inconvenient timely cleaning of the dense outer wall of the crystallization tube in existing crystallization towers, the following solution is proposed: A tower tube body with an overall vertical tubular structure; a bottom frame fixed to the outer wall of the bottom end of the tower tube body; a bottom support ring fixed to the inner circumference of the tower tube body near the bottom end, with an upwardly curved heating tube inserted into the center of the bottom support ring; a potato chip-shaped baffle with its concave surface facing upwards fixed to the inner circumference of the tower tube body near the center, with a filter screen embedded in the center of the groove of the potato chip-shaped baffle; and a horizontal sealing baffle fixed inside the tower tube body near the top of the potato chip-shaped baffle. This invention allows for periodic brushing of the outer wall of the crystallization tube during crystallization, thereby preventing reduced heat conduction efficiency due to scaling on the tube wall.

Description

Technical Field

[0001] This invention relates to the field of melt crystallization technology, and more particularly to a melt crystallization tower and crystallization method. Background Technology

[0002] A molten crystallizer is a device used to separate crystals from molten substances. It is widely used in industries such as chemical, pharmaceutical, and metallurgy for purifying substances, separating different components, or recovering target products. It utilizes temperature gradients to guide the crystallization process and is suitable for many industrial fields, especially for the purification and separation of high-purity chemicals. Its core principle is to leverage the difference in solubility of substances at different temperatures, using temperature control to transform the solute from a molten state into a crystalline solid.

[0003] Research revealed that in existing crystallization tower systems, scale and dirt accumulate on the outer wall of the crystallizer tubes after a period of use, affecting temperature measurement and conduction. Furthermore, existing crystallizer tubes are mostly densely manufactured, making cleaning particularly time-consuming and laborious. Therefore, we propose a novel crystallization tower and crystallization method that facilitates cleaning of the crystallizer tube surface. Summary of the Invention

[0004] To address the technical problem that existing crystallization towers make it difficult to clean the dense outer wall of the crystallization tube in a timely manner, the present invention adopts the following technical solution:

[0005] A melting crystallization tower includes a tower tube body with an overall vertical tubular structure. A bottom frame is fixed to the outer wall of the bottom end of the tower tube body. A bottom support ring is fixed to the inner circumference of the tower tube body near the bottom end, and an upwardly curved heating tube is inserted into the center of the bottom support ring. A potato chip-shaped partition with its concave surface facing upward is fixed to the inner circumference of the tower tube body near the center, and a filter screen is embedded in the center of the groove of the potato chip-shaped partition. A horizontal sealing baffle is fixed inside the tower tube body near the top of the potato chip-shaped partition. An insertion hole is opened in the center of the sealing baffle, and a vertical sealing through-tube is inserted into the insertion hole. The inner circumference of the tower tube body near the bottom end of the bottom support ring has an upwardly curved heating tube inserted into the center of the bottom support ring. A cap-shaped tube is fixed near the top, and an annular top cover is fixed to the outer circumference of the cap-shaped tube near the top. The annular top cover, the tower tube body, and the outer side of the annular top cover constitute a temporary storage cavity. The lower surface of the cap-shaped tube and the upper part of the sealing baffle form a crystallization chamber. Multiple crystallization tubes with a centrally symmetrical spiral structure are inserted into the surface of the cap-shaped tube. An anti-slip bearing is fixed to the inner circumference of the cap-shaped tube near the bottom, and a transmission tube extending into the crystallization chamber is rotatably connected in the anti-slip bearing. Multiple cleaning rods with a spiral distribution are fixed to the outer circumference of the transmission tube, and a brush head is fixed to the end of each cleaning rod away from the transmission tube.

[0006] Preferably, an inlet pipe is inserted into the outer circumference of the tower body near the top, and the same circulation pipe is inserted into the outer wall of the tower body near both the top and bottom. The suction end of the circulation pipe is inserted into the outer circumference of the tower body near the bottom, and a circulation pump is installed near the bottom of the circulation pipe. The water outlet end of the circulation pipe is inserted into a temporary storage chamber, so that when in use, the filtered liquid with small crystals can be recirculated and crystallized again until the crystals reach the required size.

[0007] Preferably, each of the multiple crystallizing tubes has a parallel and vertical straight tube at its bottom end, and a sealing sleeve is slidably fitted onto the bottom end of each straight tube at the bottom end of the crystallizing tube. A snap-fit ​​ring is reserved on the outer circumference of the sealing sleeve, and a compression spring is inherently present between the upper surface of the snap-fit ​​ring and the lower surface of the sealing baffle. The compression spring is fitted onto the outer wall of the corresponding straight tube. A fixing seat is fixed near the top end of the inner circumference of the cap-shaped tube, and an electric push rod is fixed on the surface of the fixing seat. A pressure block is fixed at the top end of the extension rod of the electric push rod. A lifting rod is slidably inserted into the inner circumference of the sealing through tube, and the top end of the lifting rod is fixed to the lower surface of the pressure block. A support plate is fixed through the sealing through tube at the bottom end of the lifting rod. An ear plate is reserved on the outer circumference of the support plate for sealing the bottom end of the sealing sleeve.

[0008] Preferably, the upper surface of the ear plate is fixed with a rubber plug, and the top of the rubber plug is adapted to the inner diameter of the straight tube. Multiple ribs are fixed on the outer circumference of the heating tube; this can improve the sealing effect.

[0009] Preferably, a driven gear ring is sleeved on the outer circumference of the top end of the transmission tube, and a motor base is fixed on the inner wall of the cap-shaped tube near the bottom end. A reduction motor is fixed on the surface of the motor base, and a driving gear that meshes with the driven gear ring is fixed on the top end of the output shaft of the reduction motor. The surface of the crystallization tube can be cleaned by controlling the start of the reduction motor.

[0010] Preferably, the bottom end of the cap-shaped tube has multiple through holes, and the top end of the crystallizing tube is inserted into the corresponding through hole; the plane where the top opening of the crystallizing tube is located is higher than the height of the top opening of the through hole; it can play a certain filtering role when leakage occurs, and can block some solidified blocky objects.

[0011] Preferably, the outer wall of the tower tube body is connected to cooling water pipes for water inlet and outlet at the upper and lower ends of the crystallization chamber, respectively, and the outer wall of the tower tube body has an observation window on the front, with transparent glass embedded in the observation window, so that the condition of the outer wall of the internal crystallization tube can be observed in real time and it can be determined whether its surface needs to be cleaned.

[0012] Preferably, the tower tube body has a circular hole with its center line passing through the axis of the tower tube body above the potato chip-shaped partition. A grain removal mechanism is installed in the circular hole, comprising a straight tube embedded in the hole. An eccentric trumpet tube with its larger opening facing the straight tube is fixed to the end of the straight tube away from the tower tube body. A plug ring is embedded at the opening of the eccentric trumpet tube, and a hinged cap is hinged to the surface of the plug ring. A sealed bearing is embedded in the thicker tube wall of the eccentric trumpet tube, and a through-hole spiral rod is rotatably connected to the sealed bearing. Furthermore, two limiting rings are fixed near the sealed bearing on the smooth part of the auger rod, and the same spring retaining ring is rotatably connected between the two limiting rings; a clamping spring is fixed to the side of the spring retaining ring, and the other end of the clamping spring is fixed to the surface of the hinge cover; an anti-torsion sleeve is sleeved on the end of the auger rod away from the potato chip-shaped partition, and a drive motor is fixed to the end of the anti-torsion sleeve through a coupling; a permanent magnet is fixed on the end of the auger rod away from the drive motor, and an electromagnet is embedded in the end of the outer wall of the tower tube body near the permanent magnet.

[0013] Preferably, the end of the eccentric trumpet tube furthest from the straight tube is connected to a receiving pipe, which is connected to an evaporator, allowing for further purification of the crystallized product.

[0014] A melt crystallization method includes the following steps:

[0015] S1: Before use, fill the crystallization chamber with cooling water, and then pass the saturated liquid into the temporary storage chamber through the inlet pipe. Before passing the liquid into the temporary storage chamber, make sure that the ear plate of the tray seals the bottom of multiple crystallization tubes. After the crystallization tubes are filled and have been left for a period of time, that is, after the crystallization period is over, start the electric push rod.

[0016] S2: Before starting the electric push rod to discharge the crystals, ensure that the electromagnet is energized, that is, press the spiral rod and the hinged cover tightly against the end near the plug ring; at this time, under the action of the filter screen plate at the bottom of the potato chip-shaped partition groove, the large diameter crystals are intercepted, and the remaining liquid and small crystals fall into the bottom support ring below, and wait for circulation crystallization after heating.

[0017] S3: When a large number of large-diameter grains have accumulated on the potato chip-shaped partition, the electromagnet can be turned off and the drive motor can be started to scrape the required grains into the receiving tube.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. By using a rotating transmission tube installed in the crystallization chamber in conjunction with brush heads arranged in a spiral pattern on its outer wall, the outer wall of the crystallization tube can be brushed periodically during crystallization, thereby preventing the heat conduction efficiency from deteriorating due to scaling on the tube wall.

[0020] 2. By using the set hanging rod and the support plate with ear plate, the bottom outlet of the three crystallization tubes can be blocked during crystallization, so that the liquid inside stops flowing temporarily, which is conducive to full crystallization. After crystallization for a period of time, when a large number of crystals are formed, water can be discharged again to quickly flush out the crystals.

[0021] 3. By using a permanent magnet and an electromagnet, when the electromagnet is supplied with current in different directions, it can form an attractive or repulsive force with the end of the permanent magnet, thereby forming a sealing or opening force on the hinged cover. Combined with the rotating screw rod, the large-diameter crystals left after filtration can be scraped off. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a melting crystallization tower proposed in this invention;

[0023] Figure 2 This is a schematic diagram of a melt crystallization tower and the rear structure of crystallization proposed in this invention;

[0024] Figure 3 This is a top view of a molten crystallization tower proposed in this invention;

[0025] Figure 4 This invention proposes a melting crystallization tower. Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0026] Figure 5 This invention proposes a melting crystallization tower. Figure 4 Enlarged structural diagram at point B;

[0027] Figure 6 This is a schematic diagram of the structure of a grain removal mechanism in a melt crystallization tower proposed in this invention;

[0028] Figure 7 This is a schematic diagram of the assembly structure of the crystallization tube in a melting crystallization tower proposed in this invention;

[0029] Figure 8 This is a schematic diagram of the structure of a heating tube in a melting crystallization tower proposed in this invention.

[0030] In the diagram: 1. Tower tube body; 101. Potato chip-shaped baffle; 102. Sealing baffle; 2. Liquid inlet pipe; 3. Cap-shaped pipe; 4. Annular top cover; 5. Circulation pipe; 6. Brush head; 7. Observation window; 8. Electromagnet; 9. Circulation pump; 10. Base frame; 11. Feed receiving pipe; 12. Crystal removal mechanism; 121. Straight pipe; 122. Eccentric trumpet pipe; 123. Plug ring; 124. Hinge cover; 125. Screw rod; 126. Limiting device 127. Snap ring; 128. Spring retaining ring; 129. Anti-torsion sleeve; 13. Permanent magnet; 14. Heating tube; 15. Rib plate; 16. Bottom support ring; 17. Cooling water pipe; 18. Pressure block; 19. Gear motor; 20. Driven gear ring; 21. Crystallizing tube; 22. Sealing through pipe; 23. Support plate; 24. Transmission pipe; 25. Cleaning rod; 26. Fixed bracket; 27. Hanging rod; 28. Compression spring; 29. ​​Sealing sleeve. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figure 1-8A melting crystallization tower includes a tower tube body 1 with an overall vertical tubular structure. A bottom frame 10 is fixed to the outer wall of the bottom end of the tower tube body 1. A bottom support ring 132 is fixed to the inner circumference of the tower tube body 1 near the bottom end, and an upwardly curved heating tube 13 is inserted into the middle of the bottom support ring 132. The gas outlet at the top of the heating tube 13 extends from the side. A burner can be inserted into the inner wall of the heating tube 13 for heating. A potato chip-shaped partition 101 with its concave surface facing upward is fixed to the inner circumference of the tower tube body 1 near the middle, and a filter screen is embedded in the middle of the groove bottom of the potato chip-shaped partition 101. A horizontal sealing baffle 102 is fixed to the inside of the tower tube body 1 near the top of the potato chip-shaped partition 101. An insertion hole is opened in the middle of the sealing baffle 102, and a vertical sealing through-tube 19 is inserted into the insertion hole. A cap-shaped tube 3 is fixed to the inner circumference of the tower tube body 1 near the top end, and the outer circumference of the cap-shaped tube 3 is... An annular top cover 4 is fixed near the top of the wall; the annular top cover 4, the tower tube body 1, and the outer side of the annular top cover 4 constitute a temporary storage cavity; the lower surface of the cap-shaped tube 3 and the upper part of the sealing baffle 102 form a crystallization chamber; multiple crystallization tubes 18 arranged in a spiral structure with central symmetry are inserted into the surface of the cap-shaped tube 3; an anti-slip bearing is fixed near the bottom of the inner circumference of the cap-shaped tube 3, and a transmission tube 21 extending into the crystallization chamber is rotatably connected in the anti-slip bearing; multiple cleaning rods 22 arranged in a spiral are fixed on the outer circumference of the transmission tube 21, and a brush head 6 is fixed at the end of each cleaning rod 22 away from the transmission tube 21; by using the transmission tube 21 arranged in a rotating manner in the crystallization chamber in conjunction with the brush head 6 arranged in a spiral on its outer wall, the outer wall of the crystallization tube 18 can be brushed periodically during crystallization, thereby preventing the heat conduction efficiency from deteriorating due to scaling on the tube wall of the crystallization tube 18.

[0033] Reference Figure 4 A liquid inlet pipe 2 is inserted into the outer circumference of the tower body 1 near the top, and the same circulation pipe 5 is inserted into the outer wall of the tower body 1 near both the top and bottom. The suction end of the circulation pipe 5 is inserted into the outer circumference of the tower body 1 near the bottom, and a circulation pump 9 is installed near the bottom of the circulation pipe 5. The water outlet end of the circulation pipe 5 is inserted into a temporary storage chamber, so that when in use, the filtered liquid with small crystals can be recirculated and crystallized again until the crystals reach the required size.

[0034] Reference Figure 4 and Figure 7Each of the multiple crystallizing tubes 18 has a parallel and vertical straight tube at its bottom end, and a sealing sleeve 26 is slidably sleeved at the bottom end of each straight tube at the bottom end of the crystallizing tube 18. A snap ring is reserved on the outer circumference of the sealing sleeve 26, and a compression spring 25 is inherently placed between the upper surface of the snap ring and the lower surface of the sealing baffle 102. The compression spring 25 is sleeved on the outer wall of the corresponding straight tube. A fixing seat 23 is fixed near the top end of the inner circumference of the cap-shaped tube 3, and an electric push rod is fixed on the surface of the fixing seat 23. A pressure block 15 is fixed at the top end of the extension rod of the electric push rod. The inner circumference of the sealing through tube 19 is... A hanging rod 24 is slidably inserted into the wall, and the top end of the hanging rod 24 is fixed to the lower surface of the pressure block 15. The bottom end of the hanging rod 24 passes through the sealing pipe 19 and is fixed to the support plate 20. The outer circumference of the support plate 20 is reserved with an ear plate for sealing the bottom end of the sealing sleeve 26. With the hanging rod 24 and the support plate 20 with the ear plate, the bottom outlet of the three crystallization tubes 18 can be blocked during crystallization, so that the liquid inside can temporarily stop flowing, which is conducive to full crystallization. After a period of crystallization, when a large number of crystals are formed, water can be discharged again to quickly flush out the crystals.

[0035] Reference Figure 7 The upper surface of the ear plate is fixed with a rubber plug, and the top of the rubber plug is adapted to the inner diameter of the straight tube. Multiple ribs 131 are fixed on the outer circumference of the heating tube 13, which can improve the sealing effect.

[0036] Reference Figures 3-4 The outer circumference of the top end of the transmission tube 21 is fitted with a driven gear ring 17, and the inner wall of the cap-shaped tube 3 is fixed with a motor base near the bottom end. The surface of the motor base is fixed with a reduction motor 16, and the top end of the output shaft of the reduction motor 16 is fixed with a driving gear that meshes with the driven gear ring 17. The surface of the crystallizing tube 18 can be cleaned by controlling the start of the reduction motor 16.

[0037] Reference Figure 4 The bottom end of the cap-shaped tube 3 has multiple through holes, and the top end of the crystallizing tube 18 is inserted into the corresponding through hole; the plane where the top opening of the crystallizing tube 18 is located is higher than the top opening of the through hole; it can play a certain filtering role when leakage occurs, and can block some solidified blocky objects.

[0038] Reference Figure 1-Figure 2 The outer wall of the tower tube body 1 is connected to the upper and lower ends of the crystallization chamber by cooling water pipes 14 for water inlet and outlet, respectively. The outer wall of the tower tube body 1 has an observation window 7 on the front. The observation window 7 is fitted with transparent glass, which can observe the state of the outer wall of the internal crystallization tube 18 in real time and determine whether it is necessary to clean its surface.

[0039] Reference Figures 4-6The tower tube body 1 has a circular hole above the potato chip-shaped partition 101, with the center line passing through the axis of the tower tube body 1. A grain removal mechanism 12 is installed in the circular hole, and the grain removal mechanism 12 includes a straight tube 121 embedded in the circular hole. An eccentric horn tube 122 with a large opening facing the straight tube 121 is fixed to the end of the straight tube 121 away from the tower tube body 1. A plug ring 123 is embedded at the opening of the eccentric horn tube 122, and a hinged cap 124 is hinged to the surface of the plug ring 123. A sealed bearing is embedded in the thicker tube wall of the eccentric horn tube 122, and a through-hole spiral rod 125 is rotatably connected to the sealed bearing. Two limiting rings 126 are fixed near the sealed bearing on the smooth part of the spiral rod 125. The two parts are rotatably connected by the same spring retainer ring 127; a retaining spring is fixed to the side of the spring retainer ring 127, and the other end of the retaining spring is fixed to the surface of the hinge cover 124; an anti-torsion sleeve 128 is sleeved on the end of the spiral rod 125 away from the potato chip-shaped partition 101, and the end of the anti-torsion sleeve 128 is fixed to the drive motor through a coupling; a permanent magnet 129 is fixed on the end of the spiral rod 125 away from the drive motor, and an electromagnet 8 is embedded in the end of the outer wall of the tower tube body 1 near the permanent magnet 129. When currents of different directions are passed through the electromagnet 8, it can form an attractive or repulsive force with the end of the permanent magnet 129, thereby forming a sealing and opening of the hinge cover 124. With the rotation of the spiral rod 125, the large-diameter crystals left after filtration can be scraped off.

[0040] Reference Figure 6 The end of the eccentric horn tube 122 away from the straight tube 121 is connected to a receiving pipe 11, which is connected to an evaporator, allowing for further purification of the crystallized product.

[0041] A melt crystallization method, the method comprising the following steps:

[0042] S1: Before use, fill the crystallization chamber with cooling water, and then pass the saturated liquid into the temporary storage chamber through the liquid inlet pipe 2. Before passing the liquid into the temporary storage chamber, make sure that the ear plate of the tray 20 blocks the bottom of the multiple crystallization tubes 18. After the crystallization tubes 18 are filled and stay for a period of time, that is, after the crystallization period is over, start the electric push rod.

[0043] S2: Before starting the electric push rod to discharge the crystals, ensure that the electromagnet 8 is energized, that is, press the spiral rod 125 and the hinged cover 124 tightly against the end near the plug ring 123; at this time, under the action of the filter screen plate at the bottom of the potato chip-shaped partition 101, the large-diameter crystals are intercepted, and the remaining liquid and small crystals fall into the bottom support ring 132 below, and wait for circulation crystallization after heating;

[0044] S3: When a large number of large-diameter grains have accumulated on the potato chip-shaped partition 101, the electromagnet 8 can be turned off and the drive motor can be started to scrape the required grains into the receiving tube 11.

[0045] 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 melting crystallization tower, comprising a tower tube body (1) with an overall vertical tubular structure, wherein a bottom frame (10) is fixed to the outer wall of the bottom end of the tower tube body (1), and a bottom support ring (132) is fixed to the inner circumference of the tower tube body (1) near the bottom end, and an upwardly curved heating tube (13) is inserted into the middle of the bottom support ring (132), characterized in that, The inner circumference of the tower tube body (1) is fixed with a concave surface facing upwards, forming a potato chip-shaped partition (101), and a filter screen is embedded in the center of the groove bottom of the potato chip-shaped partition (101); a horizontal sealing baffle (102) is fixed inside the tower tube body (1) near the top of the potato chip-shaped partition (101), and an insertion hole is opened in the middle of the sealing baffle (102), into which a vertical sealing through pipe (19) is inserted; a cap-shaped tube (3) is fixed near the top of the inner circumference of the tower tube body (1), and an annular top cap (4) is fixed near the top of the outer circumference of the cap-shaped tube (3); the lower surface of the cap-shaped tube (3) A crystallization chamber is formed above the sealing baffle (102); a plurality of crystallization tubes (18) in a spiral structure with central symmetry are inserted into the surface of the cap-shaped tube (3); an anti-slip bearing is fixed near the bottom of the inner circumference of the cap-shaped tube (3), and a transmission tube (21) extending into the crystallization chamber is rotatably connected in the anti-slip bearing; a plurality of cleaning rods (22) in a spiral distribution are fixed on the outer circumference of the transmission tube (21), and a brush head (6) is fixed at the end of each cleaning rod (22) away from the transmission tube (21); the outer side of the annular top cover (4), the tower tube body (1) and the cap-shaped tube (3) constitute a temporary storage cavity; Each of the crystallizing tubes (18) has a straight tube pre-installed at its bottom end, and a sealing sleeve (26) is slidably sleeved at the bottom end of the straight tube at the bottom end of each crystallizing tube (18). A snap ring is pre-installed on the outer circumferential wall of the sealing sleeve (26), and a compression spring (25) is inherently present between the upper surface of the snap ring and the lower surface of the sealing baffle (102). The compression spring (25) is sleeved on the outer wall of the corresponding straight tube. A fixing seat (2) is fixed near the top end of the inner circumferential wall of the cap-shaped tube (3). 3), and an electric push rod is fixed on the surface of the fixed card seat (23), and a pressure block (15) is fixed at the top of the electric push rod extension rod. A hanging rod (24) is slidably inserted into the inner circumference of the sealing tube (19), and the top of the hanging rod (24) is fixed on the lower surface of the pressure block (15). The bottom end of the hanging rod (24) passes through the sealing tube (19) and is fixed with a support plate (20). The outer circumference of the support plate (20) is reserved with an ear plate for sealing the bottom end of the sealing sleeve (26). The bottom end of the cap-shaped tube (3) has multiple through holes, and the top end of the crystal tube (18) is inserted into the corresponding through hole.

2. The melting crystallization tower according to claim 1, characterized in that, The outer circumference of the tower body (1) is connected to an inlet pipe (2) near the top, and the outer wall of the tower body (1) is connected to the same circulation pipe (5) near the upper and lower ends. The suction end of the circulation pipe (5) is connected to the outer circumference of the tower body (1) near the bottom end, and a circulation pump (9) is provided near the bottom end of the circulation pipe (5). The water outlet end of the top of the circulation pipe (5) is connected to a temporary storage chamber.

3. A melting crystallization tower according to claim 1, characterized in that, The upper surface of each ear plate is fixed with a rubber plug, and the top of the rubber plug is adapted to the inner diameter of the straight tube. The outer circumferential wall of the heating tube (13) is fixed with multiple ribs (131).

4. A melting crystallization tower according to claim 3, characterized in that, The drive tube (21) has a driven gear ring (17) sleeved on the outer circumference of the top end, and a motor base is fixed on the inner wall of the cap-shaped tube (3) near the bottom end. A reduction motor (16) is fixed on the surface of the motor base, and a drive gear that meshes with the driven gear ring (17) is fixed on the top end of the output shaft of the reduction motor (16).

5. A melting crystallization tower according to claim 4, characterized in that, The plane at the top opening of the crystallizer (18) is higher than the height of the top opening of the through hole.

6. A melting crystallization tower according to claim 5, characterized in that, The outer wall of the tower tube body (1) is connected to the upper and lower ends of the crystallization chamber by cooling water pipes (14) for water inlet and outlet, respectively, and the outer wall of the tower tube body (1) has an observation window (7) on the front, with transparent glass embedded in the observation window (7).

7. A melting crystallization tower according to claim 6, characterized in that, The tower tube body (1) has a circular hole above the potato chip-shaped partition (101) with its center line passing through the axis of the tower tube body (1). A grain removal mechanism (12) is installed in the circular hole. The grain removal mechanism (12) includes a straight pipe (121) embedded in the circular hole. An eccentric trumpet pipe (122) with its large opening facing the straight pipe (121) is fixed to the end of the straight pipe (121) away from the tower tube body (1). A plug ring (123) is embedded at the opening of the eccentric trumpet pipe (122), and a hinged cap (124) is hinged to the surface of the plug ring (123). A sealed bearing is embedded in the thicker pipe wall of the eccentric trumpet pipe (122), and a through-hole spiral rod (125) is rotatably connected to the sealed bearing. Two limiting rings (126) are fixed near the sealed bearing on the smooth part of the screw rod (125), and the same spring retainer (127) is rotatably connected between the two limiting rings (126); a retaining spring is fixed on the side of the spring retainer (127), and the other end of the retaining spring is fixed on the surface of the hinge cover (124); an anti-torsion sleeve (128) is sleeved on the end of the screw rod (125) away from the potato chip-shaped partition (101), and a drive motor is fixed to the end of the anti-torsion sleeve (128) through a coupling; a permanent magnet (129) is fixed on the end of the screw rod (125) away from the drive motor, and an electromagnet (8) is embedded in the end of the outer wall of the tower tube body (1) near the permanent magnet (129).

8. A melting crystallization tower according to claim 7, characterized in that, The end of the eccentric horn tube (122) away from the straight tube (121) is connected to a receiving pipe (11), which is connected to the evaporator.

9. A melt crystallization method, performed using a melt crystallization tower as described in claim 8, characterized in that, The method includes the following steps: S1: Before use, fill the crystallization chamber with cooling water, and then pass the saturated liquid into the temporary storage chamber through the inlet pipe (2). Before passing the liquid into the temporary storage chamber, make sure that the ear plate of the tray (20) seals the bottom of the multiple crystallization tubes (18). After the crystallization tubes (18) are filled and left for a period of time, that is, after the crystallization period is over, start the electric push rod. S2: Before starting the electric push rod to discharge the crystals, ensure that the electromagnet (8) is energized, that is, press the spiral rod (125) and the hinged cover (124) tightly against the end near the plug ring (123); at this time, under the action of the filter screen at the bottom of the potato chip-shaped partition (101), the large-diameter crystals are intercepted, and the remaining liquid and small crystals fall into the bottom support ring (132) below, and wait for the cycle to crystallize after heating; S3: When a large number of large-diameter grains have accumulated on the potato chip-shaped partition (101), the electromagnet (8) can be turned off and the drive motor can be started to scrape the required grains into the receiving tube (11).

Images