A concentrated liquid drying device

Abstract

The present invention particularly relates to a concentrated liquid drying device, which comprises an evaporation body, a stirring device, a condensing device and a vacuum pumping device. The evaporation body includes an evaporation cylinder body and a jacket arranged outside the evaporation cylinder body. The axis of the evaporation cylinder body is horizontally arranged. The condensing device includes a condenser. The secondary steam outlet of the evaporation cylinder body is communicated with the steam inlet of the condenser, and the condensate outlet of the condenser is communicated with the vacuum pumping device. The stirring device includes a main shaft, a plurality of scraper supports, a plurality of fixed scraper assemblies and a plurality of movable scraper assemblies. The main shaft is horizontally arranged in the evaporation cylinder body and is driven to rotate by a speed reducer. The scraper supports are fixedly arranged on the main shaft, and the plurality of scraper supports are sequentially arranged at intervals along the axial direction of the main shaft. The plurality of fixed scraper assemblies and movable scraper assemblies are all arranged sequentially along the axial direction of the main shaft, and the fixed scraper assemblies and the movable scraper assemblies are arranged at intervals along the axial direction of the main shaft, and at least one group of fixed scraper assemblies and one group of movable scraper assemblies are arranged around the circumference of the same shaft section of the main shaft.

Description

Technical Field

[0001] The present invention belongs to the technical field of evaporators, and particularly relates to a concentrated liquid drying device. Background Art

[0002] In industrial wastewater treatment, the current main concentration equipment is an evaporator, such as a single-effect evaporator, a multi-effect evaporator, an MVR evaporator, etc. However, the single-effect evaporator, multi-effect evaporator, and traditional MVR evaporator are too large in volume, and have relatively high requirements for installation height, installation environment, and installation site. The preparation and installation costs are high. The evaporator heats the material to a certain temperature. After reaching the evaporation temperature, evaporation and concentration start. Finally, only the concentrate remains in the evaporation cylinder. Due to the limitations of the evaporator itself and the insufficient stirring of the concentrate in the evaporation cylinder, the evaporation efficiency is low, the concentration ratio is not high, and a large amount of concentrated liquid is still produced. If an enterprise directly entrusts it for external treatment, it will increase a large amount of hazardous waste treatment costs for the enterprise; in the prior art, the concentrate generated after evaporation is treated as hazardous waste, generally through landfill and incineration, which will directly cause serious pollution to the atmosphere, water, and soil resources. Summary of the Invention

[0003] To solve the problems of large volume of the evaporator and low concentration ratio existing in the prior art, the present invention provides a concentrated liquid drying device, which has a small floor area, a high concentration ratio, and effectively reduces the discharge amount of the concentrate.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows. A concentrated liquid drying device includes an evaporation body, a stirring device, a condensing device, and a vacuum pumping device. The evaporation body includes an evaporation cylinder and a jacket arranged outside the evaporation cylinder. The axis of the evaporation cylinder is horizontally arranged. The condensing device includes a condenser. The secondary steam outlet of the evaporation cylinder is communicated with the steam inlet of the condenser through a pipeline. The condensate outlet of the condenser is communicated with the vacuum pumping device through a pipeline;

[0005] The stirring device includes a main shaft, a plurality of scraper supports, a plurality of fixed scraper assemblies, and a plurality of movable scraper assemblies. The main shaft is horizontally arranged in the evaporation cylinder. The main shaft is driven to rotate by a speed reducer. The scraper supports are fixedly arranged on the main shaft. A plurality of the scraper supports are sequentially arranged at intervals along the axial direction of the main shaft; a plurality of the fixed scraper assemblies and a plurality of the movable scraper assemblies are both sequentially arranged along the axial direction of the main shaft, and the fixed scraper assemblies and the movable scraper assemblies are sequentially arranged at intervals along the axial direction of the main shaft, and at least one group of the fixed scraper assemblies and at least one group of the movable scraper assemblies are arranged around the circumference of the same shaft section of the main shaft.

[0006] Preferably, the vacuum pumping device includes a vacuum ejector, a high-speed circulation pump, and a circulating water tank. The water inlet of the high-speed circulation pump is communicated with the circulating water tank through a pipeline. The water outlet of the high-speed circulation pump is communicated with the jet inlet of the vacuum ejector through a pipeline. The suction port of the vacuum ejector is communicated with the condensate outlet of the condenser through a pipeline. The jet outlet of the vacuum ejector is communicated with the circulating water tank through a pipeline. The high-speed circulation pump drives the vacuum ejector to evacuate the evaporation cylinder. After the pressure value in the evaporation cylinder reaches the set value, a heat source is introduced into the jacket, the feed port of the evaporation body is opened, and the sewage is sucked into the evaporation cylinder. The vacuum pumping capacity of the vacuum pumping device is stable and reliable.

[0007] Preferably, the vacuum pumping device further includes a water inlet pump. A coil is arranged inside the circulating water tank. The water inlet of the water inlet pump is communicated with the condenser, and the water outlet of the water inlet pump is communicated with the coil. A drain pump is connected to the drain port of the circulating water tank. When the liquid level of the circulating water tank is higher than the set value, the drain pump is turned on to discharge the excess water, facilitating the automatic drainage of the circulating water tank. The water inlet pump extracts the condensate water of the condenser to cool the water in the circulating water tank, effectively protecting the vacuum ejector from temperature influence and ensuring the efficient and stable operation of the vacuum ejector.

[0008] Preferably, the concentrated liquid drying device further includes a frame. The evaporation body, the condensation device, and the vacuum pumping device are all arranged on the frame. The condenser is located above the evaporation body. The vacuum ejector, the high-speed circulation pump, the circulating water tank, the water inlet pump, and the drain pump are all located below the evaporation body. An electric control cabinet is also arranged on the frame and is located on the side of the evaporation body. The structure of the concentrated liquid drying device is reasonably and compactly arranged. In addition, the evaporation body adopts a horizontal structure, greatly reducing the volume of the concentrated liquid drying device and its floor area, and facilitating preparation and installation.

[0009] Preferably, the concentrated liquid drying device further includes a demisting device. The air inlet of the demisting device is communicated with the evaporation cylinder, and the air outlet of the demisting device is communicated with the condenser. The setting of the demisting device effectively prevents the foam generated by the evaporation body from entering the condenser, the vacuum ejector, and the high-speed circulation pump, effectively preventing the materials entrained by the foam from corroding the condenser, the vacuum ejector, and the high-speed circulation pump, improving the concentration efficiency of the concentrated liquid drying device, and prolonging the service life of the concentrated liquid drying device.

[0010] Furthermore, the fixed scraper assembly includes a first mounting plate fixedly connected to the corresponding scraper support. A fixed scraper is fixedly arranged on the first mounting plate. The movable scraper assembly includes a connecting rod, a second mounting plate, and a third mounting plate. The second mounting plate is fixedly connected to the corresponding scraper support. The connecting rod slides radially through the second mounting plate along the main shaft. One end of the connecting rod away from the main shaft is fixedly connected to the third mounting plate. An elastic member is sleeved on the connecting rod and is located between the second mounting plate and the third mounting plate. A movable scraper is fixedly arranged on the third mounting plate. Both the fixed scraper and the movable scraper are located on the outer periphery of the scraper support and are in close contact with the inner wall of the evaporation cylinder. The fixed scraper and the movable scraper are both close to the inner wall of the evaporation cylinder to continuously scrape and stir the material. The material adhering to the inner wall of the evaporation cylinder is continuously scraped off by the fixed scraper and the movable scraper. The movable scraper assembly uses the reaction force of the fluid to always keep the movable scraper in close contact with the inner wall of the evaporation cylinder, effectively preventing dirt from accumulating on the inner wall of the evaporation cylinder. The combination of the fixed scraper assembly and the movable scraper assembly greatly improves the stirring and scraping ability of the stirring device, effectively solves the problem of insufficient stirring of the concentrate in the evaporation cylinder, improves the concentration of the concentrate in the evaporation cylinder, and effectively prevents dirt from accumulating on the inner wall of the evaporation cylinder.

[0011] Furthermore, the number of fixed scrapers in a set of the fixed scraper assemblies is multiple. The multiple fixed scrapers are arranged at intervals in the axial direction of the main shaft, and the fixed scrapers are inclined relative to the main shaft. The number of movable scrapers in a set of the movable scraper assemblies is one. The movable scraper is strip-shaped and is parallel to the main shaft. The material of the movable scraper is selected as a wear-resistant material. Adjust the inclination of the fixed scraper according to the working conditions, so as to adjust the tightness between the fixed scraper and the inner wall of the evaporation cylinder, effectively improving the scraping and stirring ability of the fixed scraper assembly. Using the reaction force of the fluid, the movable scraper is close to the inner wall of the evaporation cylinder, and the dirt adhering to the inner wall of the evaporation cylinder is continuously scraped off by the movable scraper, improving the ability of the movable scraper to scrape off the concentrate on the inner wall of the evaporation cylinder, effectively avoiding dirt accumulation on the inner wall of the evaporation cylinder. Selecting wear-resistant nylon material is super wear-resistant, effectively preventing the wear of the movable scraper and improving the service life of the movable scraper.

[0012] Furthermore, the scraper support is triangular. Two sets of the fixed scraper assemblies and one set of the movable scraper assembly are arranged circumferentially around the same shaft section of the main shaft, and the fixed scraper assemblies and the movable scraper assembly are respectively located at three corners of the scraper support; the scraper support, the first mounting plate, the second mounting plate, the third mounting plate and the fixed scraper are all made of sheet metal parts. Welding is used for fixation between the scraper support and the main shaft, between the first mounting plate and the scraper support, between the fixed scraper and the first mounting plate, and between the second mounting plate and the scraper support. The triangular scraper support has stable support, effectively reduces the occupied volume of the scraper support, and improves the stirring reliability and stirring efficiency of the stirring device; the sheet metal parts are cut by laser, effectively removing the redundant plates. The overall structure is a sheet metal welding structure, which enhances the rigidity of the stirring device, does not deform during long-term stirring, and the welded workpieces are relatively light, reducing the manufacturing cost.

[0013] Furthermore, a guide sleeve is fixedly arranged on the second mounting plate. The elastic member and the guide sleeve are located on both sides of the second mounting plate, and the connecting rod slides through the guide sleeve; at least two connecting rods are arranged in one set of the movable scraper assemblies; the elastic member is a spring. This improves the sliding reliability and stability of the connecting rod, and also improves the reliability and stability of the connecting rod driving the movable scraper to move; using a spring as the elastic member is convenient for assembly, has reliable and stable elasticity, and low cost.

[0014] Beneficial effects: The concentrated liquid drying device of the present invention has a reasonable and compact structure. The evaporation body adopts a horizontal structure, greatly reducing the volume of the concentrated liquid drying device and its floor area, and facilitating preparation and installation; the concentrated liquid drying device of the present invention can achieve automation, reducing manpower and material resources, and ensuring the smooth operation of the equipment; in the concentrated liquid drying device of the present invention, both the fixed scraper and the movable scraper are close to the inner wall of the evaporation cylinder to continuously scrape and stir the material. The material adhering to the inner wall of the evaporation cylinder is continuously scraped off by the fixed scraper and the movable scraper. The movable scraper assembly utilizes the reaction force of the fluid to always keep the movable scraper close to the inner wall of the evaporation cylinder, effectively preventing the accumulation of dirt on the inner wall of the evaporation cylinder. The combination of the fixed scraper assembly and the movable scraper assembly greatly improves the stirring and scraping ability of the stirring device, effectively solves the problem of insufficient stirring of the concentrate in the evaporation cylinder, effectively prevents the accumulation of dirt on the inner wall of the evaporation cylinder, improves the concentration of the concentrate in the evaporation cylinder, and the moisture content of the discharged material is <25%. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the front view schematic diagram of the concentrated liquid drying device of the present invention;

[0017] Figure 2 is the three-dimensional structure schematic diagram of the concentrated liquid drying device of the present invention;

[0018] Figure 3 is the partial front view schematic diagram of the stirring device of the concentrated liquid drying device of the present invention;

[0019] Figure 4 is Figure 3 the partial enlarged schematic diagram of A in

[0020] In the figure: 1. Evaporation body, 11. Evaporation cylinder, 12. Discharge port, 21. Condenser, 31. Vacuum ejector, 32. High-speed circulation pump, 33. Circulating water tank, 34. Feed water pump, 35. Drainage pump, 4. Stirring device, 41. Main shaft, 42. Scraper support, 43. Fixed scraper assembly, 431. First mounting plate, 432. Fixed scraper, 44. Movable scraper assembly, 441. Connecting rod, 442. Second mounting plate, 443. Third mounting plate, 444. Elastic member, 445. Movable scraper, 446. Guide sleeve, 45. Reducer, 5. Frame, 6. Electric control cabinet, 7. Demisting device. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1

[0023] As Figure 1 and Figure 2As shown in the figure, a concentrated liquid drying device includes an evaporation body 1, a stirring device 4, a condensation device, and a vacuum pumping device. The evaporation body 1 includes an evaporation cylinder 11 and a jacket disposed outside the evaporation cylinder 11. The axis of the evaporation cylinder 11 is horizontally arranged. The evaporation cylinder 11 is provided with a feed inlet and a discharge outlet 12. The feed inlet is connected to equipment such as a feed tank through a pipeline, and the discharge outlet 12 is connected to corresponding equipment for collecting the concentrated liquid through a pipeline. The condensation device includes a condenser 21. In this embodiment, the condenser 21 is a shell-and-tube condenser 21. The secondary steam outlet of the evaporation cylinder 11 is communicated with the steam inlet of the condenser 21 through a pipeline, and the condensate outlet of the condenser 21 is communicated with the vacuum pumping device through a pipeline;

[0024] As Figure 3 and Figure 4 shown in the figure, the stirring device 4 includes a main shaft 41, a plurality of scraper brackets 42, a plurality of fixed scraper assemblies 43, and a plurality of movable scraper assemblies 44. The main shaft 41 is horizontally arranged inside the evaporation cylinder 11. The main shaft 41 is driven to rotate by a speed reducer 45. The scraper brackets 42 are fixedly arranged on the main shaft 41, and a plurality of the scraper brackets 42 are sequentially arranged at intervals along the axial direction of the main shaft 41; a plurality of the fixed scraper assemblies 43 and a plurality of the movable scraper assemblies 44 are both arranged sequentially along the axial direction of the main shaft 41, and the fixed scraper assemblies 43 and the movable scraper assemblies 44 are arranged at intervals along the axial direction of the main shaft 41, and at least one group of the fixed scraper assemblies 43 and at least one group of the movable scraper assemblies 44 are arranged around the circumference of the same shaft section of the main shaft 41.

[0025] In order to ensure the stable and reliable vacuum pumping capacity of the vacuum pumping device, in this embodiment, as Figure 1 shown in the figure, the vacuum pumping device includes a vacuum ejector 31, a high-speed circulating pump 32, and a circulating water tank 33. The water inlet of the high-speed circulating pump 32 is communicated with the circulating water tank 33 through a pipeline, the water outlet of the high-speed circulating pump 32 is communicated with the jet inlet of the vacuum ejector 31 through a pipeline, the suction port of the vacuum ejector 31 is communicated with the condensate outlet of the condenser 21 through a pipeline, and the jet outlet of the vacuum ejector 31 is communicated with the circulating water tank 33 through a pipeline; the vacuum pumping device further includes a water inlet pump 34. A coil is arranged inside the circulating water tank 33. The water inlet of the water inlet pump 34 is communicated with the condenser 21, and the water outlet of the water inlet pump 34 is communicated with the coil; a drain pump 35 is connected to the drain port of the circulating water tank 33.

[0026] In order to make the structural setting of the concentrated liquid drying device reasonable and compact, and further reduce the volume of the concentrated liquid drying device, in this embodiment, as Figure 1As shown, the concentrated liquid drying device further includes a frame 5. The evaporation body 1, the condensation device, and the vacuum pumping device are all arranged on the frame 5. The condenser 21 is located above the evaporation body 1. The vacuum ejector 31, the high-speed circulation pump 32, the circulating water tank 33, the water inlet pump 34, and the drain pump 35 are all located below the evaporation body 1. An electric control cabinet 6 is further arranged on the frame 5, and the electric control cabinet 6 is located on the side of the evaporation body 1.

[0027] In this embodiment, as Figure 1 and Figure 2 shown, the concentrated liquid drying device further includes a demisting device 7. The air inlet of the demisting device 7 is communicated with the evaporation cylinder 11, and the air outlet of the demisting device 7 is communicated with the condenser 21, effectively preventing the foam generated by the evaporation body 1 from entering the condenser 21, the vacuum ejector 31, and the high-speed circulation pump 32, effectively preventing the materials entrained by the foam from corroding the condenser 21, the vacuum ejector 31, and the high-speed circulation pump 32, improving the concentration efficiency of the concentrated liquid drying device, and extending the service life of the concentrated liquid drying device.

[0028] In this embodiment, as Figure 3 and Figure 4 shown, the fixed scraper assembly 43 includes a first mounting plate 431. The first mounting plate 431 is fixedly connected to the corresponding scraper support 42. A fixed scraper 432 is fixedly arranged on the first mounting plate 431. The movable scraper assembly 44 includes a connecting rod 441, a second mounting plate 442, and a third mounting plate 443. The second mounting plate 442 is fixedly connected to the corresponding scraper support 42. The connecting rod 441 slides radially through the second mounting plate 442 along the main shaft 41. One end of the connecting rod 441 away from the main shaft 41 is fixedly connected to the third mounting plate 443. An elastic member 444 is sleeved on the connecting rod 441, and the elastic member 444 is located between the second mounting plate 442 and the third mounting plate 443. A movable scraper 445 is fixedly arranged on the third mounting plate 443. The fixed scraper 432 and the movable scraper 445 are both located on the outer periphery of the scraper support 42 and are both in close contact with the inner wall of the evaporation cylinder 11.

[0029] In this embodiment, as Figure 3 and Figure 4As shown in the figure, the number of fixed scraping blades 432 of a set of the fixed scraping blade assemblies 43 is multiple, and the multiple fixed scraping blades 432 are arranged at intervals in sequence along the axial direction of the main shaft 41, and the fixed scraping blades 432 are arranged obliquely with respect to the main shaft 41; the number of movable scraping blades 445 of a set of the movable scraping blade assemblies 44 is one, the movable scraping blade 445 is strip-shaped, and the movable scraping blade 445 is arranged parallel to the main shaft 41; the material of the movable scraping blade 445 is selected as wear-resistant nylon material. In order to make the overall structure of the stirring device 4 stable and reliable, the scraping blade support 42 is triangular, and two sets of the fixed scraping blade assemblies 43 and one set of the movable scraping blade assemblies 44 are arranged around the circumference of the same shaft section of the main shaft 41, and the fixed scraping blade assemblies 43 and the movable scraping blade assemblies 44 are respectively located at three corners of the scraping blade support 42; the scraping blade support 42, the first mounting plate 431, the second mounting plate 442, the third mounting plate 443 and the fixed scraping blade 432 are all made of sheet metal parts, and welding fixation is adopted between the scraping blade support 42 and the main shaft 41, between the first mounting plate 431 and the scraping blade support 42, between the fixed scraping blade 432 and the first mounting plate 431, and between the second mounting plate 442 and the scraping blade support 42; a guide sleeve 446 is fixedly arranged on the second mounting plate 442, the elastic member 444 and the guide sleeve 446 are located on both sides of the second mounting plate 442, and the connecting rod 441 slides through the guide sleeve 446; at least two connecting rods 441 are arranged for a set of the movable scraping blade assemblies 44; the elastic member 444 is selected as a spring.

[0030] The working process of this concentrated liquid drying device is as follows:

[0031] 1. The high-speed circulation pump 32 is started, and the vacuum ejector 31 evacuates the evaporation cylinder 11. After the pressure value in the evaporation cylinder 11 reaches the set value, the feed port of the evaporation body 1 is opened, and the sewage is sucked into the evaporation cylinder 11.

[0032] 2. After the sewage level in the evaporation cylinder 11 reaches the set value, the stirring device 4 is started, and at the same time, the heat source enters the jacket to exchange heat with the sewage in the evaporation cylinder 11; after the sewage level in the evaporation cylinder 11 reaches the highest level value, the feeding is stopped.

[0033] 3. After the temperature in the evaporation cylinder 11 reaches the set value, steam begins to be generated in the evaporation cylinder 11, and at the same time, the condensing device is started. The steam exchanges heat with the condensed water (cold source) in the condenser 21. The steam is cooled and liquefied into distilled water and a small amount of non-condensable gas, and then is pumped into the circulating water tank 33 from the condensate outlet of the condenser 21 by the vacuum ejector 31. That is, the vacuum pumping device evacuates the evaporation cylinder 11 to ensure that the evaporation cylinder 11 is always in a negative pressure state, and at the same time, the discharge of the condensed water and the non-condensable gas is realized, so as to ensure that the evaporation cylinder 11 is always at the set negative pressure value and the evaporation temperature of the material remains unchanged.

[0034] 4. The feed water pump 34 extracts the condensed water from the condenser 21 to cool down the water in the circulating water tank 33, effectively protecting the vacuum ejector 31 from the influence of temperature. When the liquid level of the circulating water tank 33 is higher than the set value, the drain pump 35 is turned on to discharge the excess distilled water.

[0035] 5. During the operation of the concentrated liquid drying device, when there are foams in the evaporation cylinder 11, the demisting device 7 is turned on to remove the foams. The feed inlet of the evaporation cylinder 11 is frequently opened to intermittently supply fresh wastewater into the evaporation cylinder 11.

[0036] 6. When the wastewater in the evaporation cylinder 11 reaches the set concentration, the discharge port 12 of the evaporation cylinder 11 is opened, and the stirring device is used to discharge the concentrated liquid in the evaporation cylinder 11.

[0037] The above is a water production cycle, which circulates continuously.

[0038] The specific working process of the above-mentioned stirring device 4 is as follows: the reducer 45 drives the main shaft 41 to rotate, and the rotation of the main shaft 41 drives the fixed scraper assembly 43 and the movable scraper assembly 44 to perform circular motion. During this process, both the fixed scraper 432 and the movable scraper 445 are close to the inner wall of the evaporation cylinder 11 to continuously scrape and stir the materials. The materials adhered to the inner wall of the evaporation cylinder 11 are continuously scraped off by the fixed scraper 432 and the movable scraper 445. The movable scraper assembly 44 uses the reaction force of the fluid to always keep the movable scraper 445 close to the inner wall of the evaporation cylinder 11, effectively preventing dirt from accumulating on the inner wall of the evaporation cylinder 11. The combination of the fixed scraper assembly 43 and the movable scraper assembly 44 greatly improves the stirring and scraping ability of the stirring device 4, effectively solves the problem of insufficient stirring of the concentrate in the evaporation cylinder 11, improves the concentration of the concentrate in the evaporation cylinder 11, and effectively prevents dirt from accumulating on the inner wall of the evaporation cylinder 11.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A concentrated liquid drying device, characterized in that: It includes an evaporation body (1), a stirring device (4), a condensation device and a vacuum pumping device. The evaporation body (1) includes an evaporation cylinder body (11) and a jacket arranged outside the evaporation cylinder body (11). The axis of the evaporation cylinder body (11) is horizontally arranged. The condensation device includes a condenser (21). The secondary steam outlet of the evaporation cylinder body (11) is communicated with the steam inlet of the condenser (21) through a pipeline. The condensate outlet of the condenser (21) is communicated with the vacuum pumping device through a pipeline; The stirring device (4) includes a main shaft (41), a plurality of scraper brackets (42), a plurality of fixed scraper assemblies (43) and a plurality of movable scraper assemblies (44). The main shaft (41) is arranged horizontally in the evaporation cylinder body (11). The main shaft (41) is driven to rotate by a speed reducer (45). The scraper brackets (42) are fixedly arranged on the main shaft (41). A plurality of the scraper brackets (42) are arranged at intervals along the axial direction of the main shaft (41) in sequence; A plurality of the fixed scraper assemblies (43) and a plurality of the movable scraper assemblies (44) are all arranged in sequence along the axial direction of the main shaft (41). The fixed scraper assemblies (43) and the movable scraper assemblies (44) are arranged at intervals along the axial direction of the main shaft (41) in sequence. And at least one group of the fixed scraper assemblies (43) and at least one group of the movable scraper assemblies (44) are arranged around the circumference of the same shaft section of the main shaft (41); The fixed scraper assembly (43) includes a first mounting plate (431). The first mounting plate (431) is fixedly connected to the corresponding scraper bracket (42). A fixed scraper (432) is fixedly arranged on the first mounting plate (431); The movable scraper assembly (44) includes a connecting rod (441), a second mounting plate (442) and a third mounting plate (443). The second mounting plate (442) is fixedly connected to the corresponding scraper bracket (42). The connecting rod (441) slides radially through the second mounting plate (442) along the main shaft (41). One end of the connecting rod (441) far from the main shaft (41) is fixedly connected to the third mounting plate (443). An elastic member (444) is sleeved on the connecting rod (441). The elastic member (444) is located between the second mounting plate (442) and the third mounting plate (443). A movable scraper (445) is fixedly arranged on the third mounting plate (443). The fixed scraper (432) and the movable scraper (445) are both located on the outer periphery of the scraper bracket (42) and are both in close contact with the inner wall of the evaporation cylinder body (11); The number of the fixed scrapers (432) of a group of the fixed scraper assemblies (43) is multiple. The multiple fixed scrapers (432) are arranged at intervals along the axial direction of the main shaft (41) in sequence. And the fixed scraper (432) is inclined relative to the main shaft (41); The number of the movable scrapers (445) of a group of the movable scraper assemblies (44) is one. The movable scraper (445) is strip-shaped. The movable scraper (445) is parallel to the main shaft (41).

2. The concentrated liquid drying device according to claim 1, wherein: The vacuum pumping device includes a vacuum ejector (31), a high-speed circulation pump (32) and a circulating water tank (33). The water inlet of the high-speed circulation pump (32) is communicated with the circulating water tank (33) through a pipeline. The water outlet of the high-speed circulation pump (32) is communicated with the jet inlet of the vacuum ejector (31) through a pipeline. The suction port of the vacuum ejector (31) is communicated with the condensate outlet of the condenser (21) through a pipeline. The jet outlet of the vacuum ejector (31) is communicated with the circulating water tank (33) through a pipeline.

3. The concentrated liquid drying device according to claim 2, characterized in that: The vacuum pumping device further includes a water inlet pump (34). A coil pipe is arranged inside the circulating water tank (33). The water inlet of the water inlet pump (34) is communicated with the condenser (21). The water outlet of the water inlet pump (34) is communicated with the coil pipe. A drain pump (35) is connected to the drain outlet of the circulating water tank (33).

4. The concentrated liquid drying device according to claim 3, wherein: The concentrated liquid drying device further includes a frame (5). The evaporation body (1), the condensation device and the vacuum pumping device are all arranged on the frame (5). The condenser (21) is located above the evaporation body (1). The vacuum ejector (31), the high-speed circulation pump (32), the circulating water tank (33), the water inlet pump (34) and the drain pump (35) are all located below the evaporation body (1). An electric control cabinet (6) is further arranged on the frame (5), and the electric control cabinet (6) is located on the side of the evaporation body (1).

5. The concentrated liquid drying device according to any one of claims 1 to 4, characterized in that: The concentrated liquid drying device further includes a demisting device (7). The air inlet of the demisting device (7) is communicated with the evaporation cylinder body (11). The air outlet of the demisting device (7) is communicated with the condenser (21).

6. The concentrated liquid drying device according to claim 1, wherein: The scraper support (42) is triangular. Two sets of the fixed scraper assemblies (43) and one set of the movable scraper assemblies (44) are arranged around the circumference of the same shaft section of the main shaft (41), and the fixed scraper assemblies (43) and the movable scraper assemblies (44) are respectively located at the three corners of the scraper support (42). The scraper support (42), the first mounting plate (431), the second mounting plate (442), the third mounting plate (443) and the fixed scraper (432) are all made of sheet metal parts. The scraper support (42) and the main shaft (41), the first mounting plate (431) and the scraper support (42), the fixed scraper (432) and the first mounting plate (431), and the second mounting plate (442) and the scraper support (42) are all fixed by welding.

7. The concentrated liquid drying device according to claim 1, characterized in that: A guide sleeve (446) is fixedly arranged on the second mounting plate (442). The elastic member (444) and the guide sleeve (446) are located on both sides of the second mounting plate (442). The connecting rod (441) slides through the guide sleeve (446). At least two of the connecting rods (441) are arranged for one set of the movable scraper assemblies (44). The elastic member (444) is a spring.

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