A waste heat recovery device for lithium salt production

Abstract

The present invention belongs to the field of waste heat recovery technology. The present invention discloses a waste heat recovery device for lithium salt production; it includes a shell, and also includes: an outer tube and an inner tube, the two ends of the outer tube are arranged at the two ends of the shell, and the inner tube is fixed to the two ends of the outer tube by a connecting column. The present invention sets an inner bellows and an outer bellows. The inner bellows is specially used to transport high-temperature post-crystallization liquid, and the outer bellows transports low-temperature pre-decalcification liquid. The two fluids achieve heat transfer through direct contact with the bellows wall. The corrugated design of the bellows wall increases the heat transfer area. The inner and outer bellows are completely independently sealed, eliminating the risk of mixing of post-crystallization liquid and pre-decalcification liquid. It is especially suitable for highly corrosive media in lithium salt production. The spiral corrugations destroy the laminar boundary layer of the fluid, induce the fluid to generate secondary flow and vortex, and improve the turbulence intensity. By setting the first spiral fins and the adjustment component, the first spiral fins can be adapted to fluids of different viscosities.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and more specifically, to a waste heat recovery device for lithium salt production. Background Art

[0002] Lithium salt, a core raw material for new energy batteries, undergoes multiple high-temperature processes during production, including de-crystallization and decalcification. This generates significant waste heat from the de-crystallization liquid, which can reach temperatures between 80°C and 120°C. Traditionally, this waste heat is typically discharged directly through cooling towers, resulting in energy utilization rates of less than 50% and significant waste. Furthermore, the pre-decalcification liquid must be heated to 50°C and 80°C using external steam, with preheating energy consumption accounting for over 30% of total production costs.

[0003] Therefore, efficient recovery of waste heat from the liquid after decrystallization and preheating of the liquid before decalcification have become key technical requirements for the lithium salt industry to achieve low-carbon energy conservation. However, current waste heat recovery devices are unable to efficiently recover waste heat from the liquid after decrystallization, and the recovered waste heat is not used to preheat the liquid before decalcification. Summary of the Invention

[0004] The present invention aims to solve the problem that the current waste heat recovery device in the background technology is difficult to efficiently recover the waste heat of the liquid after crystallization and the recovered waste heat is not used to preheat the liquid before decalcification, and proposes a lithium salt production waste heat recovery device.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a waste heat recovery device for lithium salt production, comprising a housing and further comprising:

[0006] The outer tube and the inner tube are arranged at both ends of the shell, and the inner tube is fixed to the two ends of the outer tube through a connecting column. An annular inner cavity is provided between the outer tube and the inner tube, and a circular inner cavity is provided inside the inner tube;

[0007] The outer tube includes an outer bellows, and the inner tube includes an inner bellows, wherein the inner bellows is fixedly connected to the inner portion of the outer bellows via a connecting column, wherein the outer wall of the outer bellows is provided with a plurality of first spiral corrugations, wherein a plurality of first spiral grooves are formed between the plurality of first spiral corrugations and the inner wall of the outer bellows, and wherein the outer wall of the inner bellows is fixedly connected with a plurality of second spiral corrugations, wherein a plurality of second spiral grooves are formed between the plurality of second spiral corrugations and the inner wall of the inner bellows;

[0008] A scraping assembly for scraping and cleaning the inner wall of the inner bellows is provided in the inner bellows, and the scraping assembly includes a scraping ring provided on the inner wall of the inner bellows, and a first scraper and a plurality of second scrapers are provided on the scraping ring. The first scraper slides in one of the second spiral grooves, and an adapter is provided on the first scraper. The first scraper slides on the surface of the second spiral rib through the adapter, and the plurality of second scrapers slide in the other second spiral grooves respectively.

[0009] Furthermore, a first spiral rib is provided on the inner wall of the outer corrugated tube, the first spiral rib is elastic, a second spiral rib is fixed in one of the second spiral grooves, and a plurality of micro spiral grooves are provided on the first spiral rib and the second spiral rib.

[0010] Furthermore, an adjustment component for adjusting the spacing between the first spiral ribs is provided in the outer bellows, and the adjustment component includes a box body fixedly connected to the inner wall of the outer bellows, and a rotating shaft is rotatably connected in the box body, and a plurality of external threads are provided on the surface of the rotating shaft, and the external threads include two left and right parts, and the external threads of the left and right parts are symmetrically arranged, and the thread density of the external threads gradually decreases from the middle of the rotating shaft to the two ends of the rotating shaft. The rotating shaft is threadedly connected to a movable block through multiple external threads, and a movable plate is fixed on the movable block. Multiple movable plates are fixed at different positions of the first spiral rib, and multiple openings are provided on the box body. The movable plate is used to seal the opening, and a rotating port is provided at one end of the rotating shaft.

[0011] Furthermore, a connecting rod is fixedly connected between the first scraper and the scraper ring, and an anti-collision plate is fixedly connected to the connecting rod. The anti-collision plate is conical and has a plurality of holes.

[0012] Furthermore, the outer tube also includes a first connecting tube fixedly connected to both ends of the outer corrugated tube, one end of each of the two first connecting tubes is fixedly connected to a first metal hose, one end of each of the two first metal hoses is fixedly connected to a second connecting tube, the inner tube also includes a third connecting tube fixedly connected to both ends of the inner corrugated tube, one end of each of the two third connecting tubes is fixedly connected to a second metal hose, one end of each of the two second metal hoses is fixedly connected to a fourth connecting tube, the second connecting tube is fixedly connected to both ends of the shell, and the fourth connecting tube is fixedly connected to the inner wall of the second connecting tube through a connecting column.

[0013] Furthermore, a rotating ring is rotatably connected to the inner wall of one of the third connecting tubes, a connecting column is fixedly connected to the rotating ring, a threaded column is fixedly connected to the anti-collision plate, and the threaded column is threadedly connected to the connecting column.

[0014] The technical effects and advantages of the waste heat recovery device for lithium salt production of the present invention are as follows:

[0015] (1) By setting up an inner bellows and an outer bellows, the inner bellows is specially used to transport high-temperature decrystallization liquid, and the outer bellows is used to transport low-temperature decalcification liquid. The two fluids achieve heat transfer through direct contact with the bellows wall. The corrugated design of the bellows wall increases the heat transfer area. The inner and outer bellows are completely independently sealed, eliminating the risk of mixing the decrystallization liquid and the decalcification liquid. It is especially suitable for highly corrosive media in lithium salt production. The spiral corrugations destroy the laminar boundary layer of the fluid, induce the fluid to generate secondary flow and vortex, and increase the turbulence intensity. By setting up the first spiral fins and the adjustment component, the first spiral fins can be adapted to fluids of different viscosities.

[0016] (2) By setting up a scraping assembly and pushing the scraper ring through an external pushing mechanism, the scraper ring moves along the second spiral groove on the inner wall of the inner bellows. The movement of the scraper ring can scrape and clean the inner wall of the inner bellows. The first scraper can scrape and clean the surface of the second spiral rib, and the second scraper can scrape and clean the inside of the second spiral groove. By setting up an anti-collision plate, the anti-collision plate can make the flow rate evenly distributed, thereby reducing the impact corrosion of the fluid on the inner bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Schematic diagram of the outer bellows structure in the present invention;

[0019] Figure 3 Schematic cross-sectional view of the outer bellows and the inner bellows in the present invention;

[0020] Figure 4 For the present invention Figure 3 A in the middle is an enlarged schematic diagram;

[0021] Figure 5 Schematic diagram of the first spiral fin structure in the present invention;

[0022] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point B in the middle;

[0023] Figure 7 This is a schematic diagram of the separation structure of the box body and the rotating shaft in the present invention;

[0024] Figure 8 For the present invention Figure 7 Enlarged schematic diagram at point C in the middle;

[0025] Figure 9 It is a schematic diagram of a local three-dimensional structure of the present invention;

[0026] Figure 10 This is a schematic diagram of the first spiral fin and the first scraper structure in the present invention.

[0027] In the picture:

[0028] 1. Shell; 2. Outer tube; 201. Outer bellows; 202. First connecting tube; 203. First metal hose; 204. Second connecting tube; 3. Inner tube; 301. Inner bellows; 302. Third connecting tube; 303. Second metal hose; 304. Fourth connecting tube; 4. Annular inner cavity; 5. Circular inner cavity; 6. First spiral corrugation; 7. First spiral groove; 8. Second spiral corrugation; 9. Second spiral groove; 10. First spiral rib; 11. Second spiral rib; 12. Micro spiral groove; 13. Scraper ring; 14. First scraper; 15. Adapter; 16. Second scraper; 17. Connecting rod; 18. Anti-collision plate; 19. Rotating ring; 20. Connecting column; 21. Threaded column; 22. Box body; 23. Rotating shaft; 24. External thread; 25. Moving block; 26. Moving plate; 27. Opening; 28. Rotating mouth. DETAILED DESCRIPTION

[0029] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Reference Figure 1 - Figure 10 A waste heat recovery device for lithium salt production includes a housing 1 and further includes:

[0031] The outer tube 2 and the inner tube 3 are provided at both ends of the shell 1, and the inner tube 3 is fixed to both ends of the outer tube 2 through connecting columns. An annular inner cavity 4 is provided between the outer tube 2 and the inner tube 3, and a circular inner cavity 5 is provided inside the inner tube 3;

[0032] During use, the outer tube 2 and the inner tube 3 are fixed to the two ends of the shell 1 by connecting columns to form a nested structure, so that the high-temperature decrystallized liquid flows through the circular inner cavity 5 of the inner tube 3, and the low-temperature pre-decrystallization liquid flows through the annular inner cavity 4 between the outer tube 2 and the inner tube 3. The two fluids perform indirect heat exchange through the tube wall of the inner tube 3, and heat is transferred from the high-temperature liquid to the low-temperature liquid, that is, the heat of the high-temperature decrystallized liquid is used to preheat the low-temperature pre-decrystallization liquid. The outer tube 2 and the inner tube 3 are independently sealed to avoid medium mixing, and are suitable for highly corrosive media.

[0033] Reference Figure 2 、 Figure 3 and Figure 4The outer tube 2 includes an outer bellows 201, and the inner tube 3 includes an inner bellows 301. The inner bellows 301 is fixedly connected to the inside of the outer bellows 201 through a connecting column. The outer wall of the outer bellows 201 is provided with a plurality of first spiral corrugations 6, and a plurality of first spiral grooves 7 are formed between the plurality of first spiral corrugations 6 and the inner wall of the outer bellows 201. The outer wall of the inner bellows 301 is fixed with a plurality of second spiral corrugations 8, and a plurality of second spiral grooves 9 are formed between the plurality of second spiral corrugations 8 and the inner wall of the inner bellows 301; the first spiral grooves 7 and the second spiral grooves 9 in the outer bellows 201 and the inner bellows 301 form a spiral flow channel, and the fluid generates a rotating flow in the first spiral grooves 7 and the second spiral grooves 9, destroying the laminar boundary layer and enhancing turbulence. The spiral corrugations and spiral grooves can increase the fluid disturbance intensity and reduce the flow resistance. The spiral corrugations can disperse stress and extend the service life. Heat can be directly transferred through the tube wall of the inner bellows 301 to achieve efficient waste heat recovery.

[0034] Reference Figure 4 and Figure 10 A first spiral rib 10 is provided on the inner wall of the outer bellows 201. The first spiral rib 10 is elastic, and a second spiral rib 11 is fixed in one of the second spiral grooves 9. A plurality of micro spiral grooves 12 are provided on the first spiral rib 10 and the second spiral rib 11. The first spiral rib 10 and the second spiral rib 11 on the inner wall of the outer bellows 201 can force the formation of turbulence to enhance local heat exchange, and the surface micro spiral grooves 12 induce micro vortexes to further enhance heat transfer.

[0035] Reference Figure 5 、 Figure 6 、 Figure 7 and Figure 8The outer bellows 201 is provided with an adjustment component for adjusting the spacing of the first spiral ribs 10. The adjustment component includes a box body 22 fixedly connected to the inner wall of the outer bellows 201, and a rotating shaft 23 is rotatably connected in the box body 22. The surface of the rotating shaft 23 is provided with a plurality of external threads 24, and the external threads 24 include two parts on the left and right. The external threads 24 of the left and right parts are symmetrically arranged, and the thread density of the external threads 24 gradually decreases from the middle of the rotating shaft 23 to the two ends of the rotating shaft 23. The rotating shaft 23 is threadedly connected to a moving block 25 through a plurality of external threads 24. A moving plate 26 is fixed on the moving block 25. A plurality of moving plates 26 are fixed at different positions of the first spiral rib 10. A plurality of openings 27 are provided on the box body 22, and the moving plate 26 is used to block the opening 27. A rotating port 28 is provided at one end of the rotating shaft 23; when it is necessary to adapt the spacing of the first spiral ribs 10 to the liquids of different viscosities flowing through the outer bellows 201, a tool and a rotary The rotating mouth 28 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives multiple moving blocks 25 to move simultaneously through the external thread 24. Since the left and right parts of the external threads 24 are symmetrically arranged and the thread density of the external threads 24 gradually decreases from the middle of the rotating shaft 23 to the two ends of the rotating shaft 23, that is, the pitch of the external threads 24 gradually increases from the middle of the rotating shaft 23 to the two ends, the moving blocks 25 on both sides move toward the middle of the rotating shaft 23. The closer the moving block 25 is to the middle of the rotating shaft 23, the smaller the movement distance, and the farther the moving block 25 is from the middle of the rotating shaft 23, the greater the movement distance. The moving block 25 drives the moving plate 26 to move, and the moving plate 26 drives different positions of the first spiral ribs 10 to move, that is, the first spiral ribs 10 expand or compress. The spacing of the first spiral ribs 10 can be adjusted according to the viscosity of the fluid flowing through the outer bellows 201, that is, the higher the viscosity of the fluid, the larger the spacing of the first spiral ribs 10, and the lower the viscosity of the fluid, the smaller the spacing of the first spiral ribs 10.

[0036] Reference Figure 4 、 Figure 9 and Figure 10The inner bellows 301 is provided with a scraping assembly for scraping and cleaning the inner wall of the inner bellows 301. The scraping assembly includes a scraping ring 13 provided on the inner wall of the inner bellows 301. The scraping ring 13 is provided with a first scraper 14 and a plurality of second scrapers 16. The first scraper 14 slides in one of the second spiral grooves 9. The first scraper 14 is provided with an adapter 15. The first scraper 14 slides on the surface of the second spiral rib 11 through the adapter 15. The plurality of second scrapers 16 are respectively provided in the other second spiral grooves. 9; when it is necessary to clean the inner wall of the inner bellows 301 which is easy to crystallize, the scraper ring 13 is pushed to move by the external pushing mechanism, and the scraper ring 13 will spirally move in the second spiral groove 9 through the first scraper 14 and the second scraper 16. The scraper ring 13 can scrape and clean the inner wall of the inner bellows 301, and the first scraper 14 can scrape and clean one of the second spiral grooves 9 and the second spiral rib 11 through the adapter 15, and the second scraper 16 can scrape and clean the other second spiral grooves 9.

[0037] Reference Figure 4 and Figure 9 A connecting rod 17 is fixedly connected between the first scraper 14 and the scraper ring 13, and an anti-collision plate 18 is fixedly connected to the connecting rod 17. The anti-collision plate 18 is conical and has multiple holes. By setting the anti-collision plate 18, the conical structure of the anti-collision plate 18 will disperse the impact of the inlet fluid and evenly distribute the flow rate. During the scraping and cleaning process of the scraper ring 13, cleaning liquid can be injected into the inner bellows 301. The impact of the liquid on the anti-collision plate 18 will generate vibration, which helps scraping and cleaning.

[0038] Reference Figure 2 and Figure 3 The outer tube 2 also includes a first connecting tube 202 fixedly connected to both ends of the outer bellows 201, one end of the two first connecting tubes 202 are fixedly connected to the first metal hose 203, one end of the two first metal hoses 203 are fixedly connected to the second connecting tube 204, the inner tube 3 also includes a third connecting tube 302 fixedly connected to both ends of the inner bellows 301, one end of the two third connecting tubes 302 are fixedly connected to the second metal hose 303, one end of the two second metal hoses 303 are fixedly connected to the fourth connecting tube 304, the second connecting tube 204 is fixed to both ends of the shell 1, and the fourth connecting tube 304 is fixed to the inner wall of the second connecting tube 204 through a connecting column; the first metal hose 203 and the second metal hose 303 are arranged by the corrugated hose to compensate for thermal expansion and contraction deformation, and are connected to the external fluid pipeline through the second connecting tube 204 and the fourth connecting tube 304 to ensure sealing.

[0039] Reference Figure 4 and Figure 9The inner wall of one of the third connecting tubes 302 is rotatably connected to a rotating ring 19, a connecting column 20 is fixed to the rotating ring 19, and a threaded column 21 is fixed to the anti-collision plate 18, and the threaded column 21 is threadedly connected to the connecting column 20; when the scraper ring 13 needs to be used, the rotating ring 19 is rotated, and the rotating ring 19 drives the connecting column 20 to rotate, and the connecting column 20 is rotated out of the threaded column 21, and the lock of the threaded column 21, the anti-collision plate 18 and the scraper ring 13 is released, and the scraper ring 13 can be used for scraping and cleaning, and the rotating ring 19 and the connecting column 20 can lock the scraper ring 13 and the anti-collision plate 18.

[0040] Working Principle: When in use, the outer tube 2 and the inner tube 3 are fixed to the two ends of the shell 1 by connecting columns to form a nested structure. The high-temperature decrystallized liquid flows through the circular inner cavity 5 of the inner tube 3, and the low-temperature pre-decalcification liquid flows through the annular inner cavity 4 between the outer tube 2 and the inner tube 3. The two fluids conduct indirect heat exchange through the tube wall of the inner tube 3. Heat is transferred from the high-temperature liquid to the low-temperature liquid, that is, the heat of the high-temperature decrystallized liquid is used to preheat the low-temperature pre-decalcification liquid. The outer tube 2 and the inner tube 3 are independently sealed to avoid mixing of the media. It is suitable for highly corrosive media.

[0041] The first spiral grooves 7 and the second spiral grooves 9 in the outer bellows 201 and the inner bellows 301 form a spiral flow channel. The fluid generates a rotating flow in the first spiral grooves 7 and the second spiral grooves 9, destroying the laminar boundary layer and enhancing turbulence. The spiral corrugations and spiral grooves can increase the fluid disturbance intensity and reduce flow resistance. The spiral corrugations can disperse stress and extend the service life. Heat can be directly transferred through the wall of the inner bellows 301 to achieve efficient waste heat recovery.

[0042] The first spiral fins 10 and the second spiral fins 11 on the inner wall of the outer bellows 201 can force turbulence to enhance local heat transfer, and the micro spiral grooves 12 on the surface induce micro eddies to further enhance heat transfer;

[0043] When it is necessary to adapt the spacing of the first spiral ribs 10 to the liquids of different viscosities flowing through the outer bellows 201, the rotating shaft 23 is driven to rotate by the tool and the rotating port 28, and the rotating shaft 23 drives multiple moving blocks 25 to move simultaneously through the external threads 24. Since the left and right parts of the external threads 24 are symmetrically arranged and the thread density of the external threads 24 gradually decreases from the middle of the rotating shaft 23 to the two ends of the rotating shaft 23, the moving blocks 25 on both sides move toward the middle of the rotating shaft 23. The closer the moving block 25 is to the middle of the rotating shaft 23, the smaller the movement distance, and the farther the moving block 25 is from the middle of the rotating shaft 23, the greater the movement distance. The moving block 25 drives the moving plate 26 to move, and the moving plate 26 drives different positions of the first spiral ribs 10 to move, that is, the first spiral ribs 10 expand or compress. The spacing of the first spiral ribs 10 can be adjusted according to the viscosity of the fluid flowing through the outer bellows 201, that is, the higher the viscosity of the fluid, the larger the spacing of the first spiral ribs 10, and the lower the viscosity of the fluid, the smaller the spacing of the first spiral ribs 10;

[0044] When it is necessary to clean the inner wall of the inner bellows 301 that is prone to crystallization, the scraper ring 13 is pushed to move by the external pushing mechanism. The scraper ring 13 will move spirally in the second spiral groove 9 through the first scraper 14 and the second scraper 16. The scraper ring 13 can scrape and clean the inner wall of the inner bellows 301. The first scraper 14 can scrape and clean one of the second spiral grooves 9 and the second spiral rib 11 through the adapter 15, and the second scraper 16 can scrape and clean the other second spiral grooves 9.

[0045] By providing the anti-collision plate 18, the anti-collision plate 18 with a conical structure can disperse the impact of the inlet fluid and evenly distribute the flow rate. In addition, during the scraping and cleaning process of the scraper ring 13, cleaning liquid can be injected into the inner bellows 301. The impact of the liquid on the anti-collision plate 18 will generate vibration, which helps scraping and cleaning.

[0046] The first metal hose 203 and the second metal hose 303 are provided by a corrugated hose to compensate for thermal expansion and contraction, and are connected to an external fluid pipeline through the second connecting pipe 204 and the fourth connecting pipe 300 to ensure sealing;

[0047] When the scraper ring 13 needs to be used, the rotating ring 19 is rotated. The rotating ring 19 rotates through the connecting column 20, and the connecting column 20 is turned out of the threaded column 21, thereby releasing the lock of the threaded column 21, the anti-collision plate 18 and the scraper ring 13. The scraper ring 13 can then be used for scraping and cleaning. The rotating ring 19 and the connecting column 20 can lock the scraper ring 13 and the anti-collision plate 18.

[0048] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0049] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waste heat recovery device for lithium salt production, comprising a housing (1), characterized in that: Also includes: An outer tube (2) and an inner tube (3), wherein both ends of the outer tube (2) are arranged at both ends of the shell (1), and the inner tube (3) is fixed to both ends of the outer tube (2) via connecting columns, an annular inner cavity (4) is provided between the outer tube (2) and the inner tube (3), and a circular inner cavity (5) is provided inside the inner tube (3); The outer tube (2) includes an outer bellows (201), and the inner tube (3) includes an inner bellows (301). The inner bellows (301) is fixedly connected to the interior of the outer bellows (201) via a connecting column. The outer wall of the outer bellows (201) is provided with a plurality of first spiral corrugations (6), and a plurality of first spiral grooves (7) are formed between the plurality of first spiral corrugations (6) and the inner wall of the outer bellows (201). The outer wall of the inner bellows (301) is fixedly connected with a plurality of second spiral corrugations (8), and a plurality of second spiral grooves (9) are formed between the plurality of second spiral corrugations (8) and the inner wall of the inner bellows (301). A first spiral rib (10) is provided on the inner wall of the outer bellows (201), the first spiral rib (10) being elastic, a second spiral rib (11) being fixedly connected to one of the second spiral grooves (9), and a plurality of micro spiral grooves (12) are provided on both the first spiral rib (10) and the second spiral rib (11); A scraping assembly for scraping and cleaning the inner wall of the inner bellows (301) is provided in the inner bellows (301), the scraping assembly comprising a scraping ring (13) provided on the inner wall of the inner bellows (301), a first scraper (14) and a plurality of second scrapers (16) provided on the scraping ring (13), the first scraper (14) sliding in one of the second spiral grooves (9), an adapter (15) provided on the first scraper (14), the first scraper (14) sliding on the surface of the second spiral rib (11) through the adapter (15), and the plurality of second scrapers (16) sliding in the other second spiral grooves (9) respectively.

2. The lithium salt production waste heat recovery device according to claim 1, characterized in that: An adjustment component for adjusting the spacing of the first spiral fins (10) is provided in the outer bellows (201), the adjustment component comprising a box body (22) fixedly connected to the inner wall of the outer bellows (201), a rotating shaft (23) rotatably connected in the box body (22), a surface of the rotating shaft (23) being provided with a plurality of external threads (24), the external threads (24) comprising left and right parts, the left and right parts of the external threads (24) being symmetrically arranged, and the thread density of the external threads (24) being determined by the rotating shaft ( The middle portion of the rotating shaft (23) gradually decreases toward both ends of the rotating shaft (23); the rotating shaft (23) is threadedly connected to a moving block (25) through a plurality of external threads (24); a moving plate (26) is fixed to the moving block (25); a plurality of the moving plates (26) are fixed to different positions of the first spiral rib (10); a plurality of openings (27) are provided on the box body (22); the moving plates (26) are used to block the openings (27); and a rotating opening (28) is provided at one end of the rotating shaft (23).

3. The lithium salt production waste heat recovery device according to claim 2, characterized in that: A connecting rod (17) is fixedly connected between the first scraper (14) and the scraper ring (13), and an anti-collision plate (18) is fixedly connected to the connecting rod (17). The anti-collision plate (18) is conical and has a plurality of holes.

4. The lithium salt production waste heat recovery device according to claim 3, characterized in that: The outer tube (2) further comprises a first connecting tube (202) fixedly connected to both ends of the outer bellows (201), one end of each of the two first connecting tubes (202) being fixedly connected to a first metal hose (203), and one end of each of the two first metal hoses (203) being fixedly connected to a second connecting tube (204); the inner tube (3) further comprises a third connecting tube (302) fixedly connected to both ends of the inner bellows (301), one end of each of the two third connecting tubes (302) being fixedly connected to a second metal hose (303), and one end of each of the two second metal hoses (303) being fixedly connected to a fourth connecting tube (304); the second connecting tube (204) being fixedly connected to both ends of the shell (1), and the fourth connecting tube (304) being fixedly connected to the inner wall of the second connecting tube (204) via a connecting column.

5. The lithium salt production waste heat recovery device according to claim 4, characterized in that: A rotating ring (19) is rotatably connected to the inner wall of one of the third connecting tubes (302), a connecting column (20) is fixedly connected to the rotating ring (19), a threaded column (21) is fixedly connected to the anti-collision plate (18), and the threaded column (21) is threadedly connected to the connecting column (20).

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