Multiphase rotating flow vacuum continuous drying machine

Abstract

The invention belongs to the technical field of vacuum drying machines, and provides a multiphase rotating flow vacuum continuous drying machine which comprises a raw material liquid tank, a material conveying assembly, a continuous drying assembly and a discharging assembly. The continuous drying assembly comprises a first-stage evaporation section, a second-stage drying section, a third-stage drying section, an air inlet jacket, a second-stage jacket and a first-stage jacket; the first-stage evaporation section, the second-stage drying section and the third-stage drying section are mounted between the conveying assembly and the discharging assembly; the air inlet jacket is mounted on the peripheral side of the third-stage drying section; the second-stage jacket is mounted on the peripheral side of the second-stage drying section; the continuous drying assembly, the conveying assembly and the discharging assembly are arranged, the temperature difference between a gas phase and a solid phase and steam can be increased and the heat transfer coefficient can be increased in the mode that the circulation direction of the gas phase and the solid phase in the continuous drying assembly is opposite to the circulation direction of the steam in the jacket, and therefore the drying efficiency is improved, and full utilization of heat energy is achieved; the energy consumption is reduced, and the drying cost can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum dryers, in particular to a multiphase rotary flow vacuum continuous dryer. Background Art

[0002] A dryer is a mechanical device that uses heat to reduce pressure and the boiling point of materials in a vacuum environment, so that the moisture in the materials evaporates quickly and dries. It is used to perform vacuum drying operations on objects. The dryer vaporizes the moisture in the material (generally refers to water or other volatile liquid components) by heating to obtain solid materials with a specified moisture content. The purpose of drying is to provide materials for use or further processing. Low-temperature vacuum drying is widely used in traditional Chinese medicine extraction, plant extraction, formula granules, health products, alcohol solvent concentrates, food, chemicals, lithium batteries and other industries.

[0003] Many existing drying methods have disadvantages:

[0004] 1. Vacuum belt dryer: The machine body is too long, with the main machine alone being about 15 meters long. The cleaning time is long and takes a day. The waste liquid from cleaning is difficult to handle (mainly because the amount of cleaning water is too large and the environmental pressure is too great). The structure is complex (too many parts such as crawlers, cylinders, and deviation corrections). The feed specific gravity requirement is high (secondary concentrated liquid is required, and the additional secondary concentration equipment causes labor, energy, and material losses). The maintenance rate is extremely high. After the dried powder has been left standing for a period of time, the coliform group increases several times.

[0005] 2. Spray dryer: The machine body is large and high (over 7 meters, and it has to pass through the floor), the drying temperature is high, the energy consumption is high (thermal efficiency is about 40%), the start-up is slow, the heat loss is high, and the coliform group increases several times after the dried powder is left to stand for a period of time;

[0006] 3. Vacuum oven: small output, long time, high labor intensity (loading and cleaning, cannot operate continuously).

[0007] From the above summary, it can be seen that the existing drying devices are usually large in size, with average drying efficiency, not thorough enough, and after the dried powder is left standing for a period of time, the coliform group increases several times, affecting the product quality. At the same time, some drying devices have complex structures and are difficult to clean inside.

[0008] Therefore, those skilled in the art have proposed a multiphase rotary flow vacuum continuous dryer to solve the problems raised in the background art. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a multiphase rotary flow vacuum continuous dryer to solve the problems in the prior art that the drying devices are usually large in size, the drying efficiency is average, the drying is not thorough enough, and the coliform group increases several times after the dried powder is left to stand for a period of time, affecting the product quality. At the same time, some drying devices have complex structures and are difficult to clean inside.

[0010] A multiphase rotary flow vacuum continuous dryer, comprising a raw material liquid tank, a material feeding component, a continuous drying component and a material discharging component;

[0011] The continuous drying assembly comprises a primary evaporation section, a secondary drying section and a tertiary drying section installed between the feeding assembly and the discharging assembly, an air inlet jacket installed on the periphery of the tertiary drying section, a secondary jacket installed on the periphery of the secondary drying section, and a primary jacket installed on the periphery of the primary evaporation section;

[0012] The feeding assembly, the primary evaporation section, the secondary drying section, the tertiary drying section, and the discharging assembly are sequentially connected in series via tangent ports; the air inlet jacket, the secondary jacket, and the primary jacket are sequentially connected in series via tangent ports, and the gas-solid two-phase flow direction in the continuous drying assembly is opposite to the steam flow direction in the jacket.

[0013] Preferably, a first tangent opening is connected between the feeding assembly and the first-level evaporation section, a second tangent opening is connected between the first-level evaporation section and the second-level drying section, a third tangent opening is connected between the second-level drying section and the third-level drying section, and a fourth tangent opening is connected between the third-level drying section and the discharge assembly; a steam tangent opening is provided on the peripheral side of the air inlet jacket.

[0014] Preferably, the feeding assembly includes a vacuum pump, a feed pump installed at the discharge end of the raw material liquid tank, a venturi ejector installed at the first tangent port connection end, and an ultra-high temperature instantaneous sterilization section installed between the feed pump and the venturi ejector. A sterilization jacket is installed around the ultra-high temperature instantaneous sterilization section, a steam tangent port is also provided around the sterilization jacket, and condensate outlets are provided around the primary jacket and the sterilization jacket.

[0015] Preferably, the discharging assembly includes a rotating gas-solid separator connected to the discharging end of the fourth tangent port, and a screw conveyor installed at the discharging end of the rotating gas-solid separator.

[0016] Preferably, a liquid nitrogen inlet is connected to the peripheral side of the screw conveyor, and a powder outlet is provided at the end of the screw conveyor.

[0017] Preferably, the air outlet of the rotary gas-solid separator is connected to a condenser, and the air outlet of the condenser is connected to a vacuum pump, an air-water separation tank is installed at the output end of the vacuum pump, the condensate discharge port of the condenser is connected to a condensate tank through a pipeline, the air inlet end of the venturi ejector is an inert gas inlet, the air-water separation tank is connected to the inert gas inlet through a pipeline, and the air-water separation tank returns the separated inert gas to the venturi ejector.

[0018] Preferably, a high-speed crushing impeller is installed on the inner wall of the third tangent opening.

[0019] Preferably, a washing component is installed at the continuous drying assembly, and the washing component includes a washing liquid tank, a washing water circulation pump, a rotating washing pipe installed between the first evaporation section, the second drying section, the third drying section and the washing water circulation pump, a spray nozzle opened on the circumference of the rotating washing pipe, and a washing liquid inlet connected to the end of the rotating washing pipe. The three groups of washing liquid inlets are connected in parallel with the washing water circulation pump, and a dynamic seal is installed at the washing liquid inlet.

[0020] Preferably, the inner walls of the first-stage evaporation section, the second-stage drying section and the third-stage drying section are all equipped with a washing tube center positioning bearing, the rotating washing tube is connected to the washing tube center positioning bearing, a plurality of washing tube pushing pieces are fixed to the inner wall of the liquid inlet end of the rotating washing tube, the liquid inlet end of the rotating washing tube is a conical tubular structure and a closed arc swirl blade is installed inside.

[0021] Preferably, a sight glass is installed at the end of the first-level evaporation section, and the heating surfaces of the first-level evaporation section, the second-level drying section, the third-level drying section and the ultra-high temperature instantaneous sterilization section are made of stainless steel mirror polished material, and the heating surfaces of the first-level evaporation section, the second-level drying section, the third-level drying section and the ultra-high temperature instantaneous sterilization section are sprayed enameled to prevent the formation of dirt and improve the heat and mass transfer efficiency and product quality.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention sets a continuous drying component, a feeding component and a discharging component. The gas-solid two-phase flow direction in the continuous drying component is opposite to the steam flow direction in the jacket for heat transfer. The countercurrent method can increase the heat transfer coefficient between the gas-solid two-phase and the steam, thereby improving the drying efficiency, realizing full utilization of thermal energy, reducing energy consumption, and reducing the drying cost; through the high-speed crushing impeller, large-particle agglomerate powder and residual viscous wet ball materials are crushed and dispersed at high speed, making the material more uniform, which is conducive to subsequent processing and drying; through the rotating gas-solid separator, the gas-solid two-phase high-speed rotating flow is moved to generate centrifugal force to achieve effective separation, which is convenient for separate processing and collection.

[0024] 2. The present invention can quickly cool the powder and freeze it to sub-zero temperature by setting a screw conveyor, a liquid nitrogen inlet and a powder outlet, thereby improving product quality and greatly increasing the shelf life of the product. It can also replace the residual oxygen in the powder to form an oxygen-free contact package to prevent the growth of E. coli.

[0025] 3. The present invention sets a washing component and changes the flow direction of the washing liquid through closed arc swirl blades, so that the washing liquid forms a rotating flow. The liquid in the rotating flow pushes the washing tube pushing plate to make the rotating washing tube rotate 360 ​​degrees rapidly. The washing water is sprayed to the inner wall of the heating tube through the spray nozzle to perform 360-degree automatic cleaning without dead ends, so that the inside of the drying section that is hit can be quickly cleaned, and the cleaning structure is not complicated, which is convenient for maintenance in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of a closed arc swirl blade;

[0028] Figure 3 It is the structural schematic diagram of the high-speed crushing impeller;

[0029] Figure 4 It is the structural schematic diagram of the screw conveyor;

[0030] Figure 5 It is a structural schematic diagram of the washing component;

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the high-speed crushing impeller;

[0032] Figure 7 is a structural schematic diagram of the first tangent port;

[0033] Figure 8 It is a schematic diagram of the structure of a closed arc swirl blade;

[0034] Fig. 9 It is a schematic diagram of the enlarged structure of the washing liquid inlet;

[0035] Fig.10 It is a schematic diagram of the gas-solid two-phase flow structure in the drying section;

[0036] Fig.11 Schematic diagram of the gas-solid two-phase flow cross-section structure in the drying section.

[0037] In the figure:

[0038] 1. Raw material liquid tank; 2. Ultra-high temperature instantaneous sterilization section; 3. Venturi ejector; 4. First tangent port; 5. Primary evaporation section; 6. Second tangent port; 7. Secondary drying section; 701, third tangent port; 8. High-speed crushing impeller; 9. Air intake jacket; 901, secondary jacket; 902, primary jacket; 903, sterilization jacket; 10, tertiary drying section; 11, fourth tangent port; 12, rotary gas-solid separator; 13, screw conveyor; 1301, Liquid nitrogen inlet; 1302, powder outlet; 14, washing liquid tank; 15, dynamic seal; 16, washing liquid inlet; 17, washing tube center positioning bearing; 18, closed arc swirl blade; 19, washing tube pusher; 20, rotating washing tube; 21, injection nozzle; 22, steam tangent port; 23, condenser; 24, sight glass; 25, condensate tank; 26, gas-water separation tank; 27, vacuum pump; 28, feed pump; 29, washing water circulation pump. DETAILED DESCRIPTION

[0039] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0040] Embodiment 1: As shown in the attached Figure 1 To Attachment Fig.11 As shown: The present invention provides a multiphase rotary flow vacuum continuous drying machine, comprising a raw material liquid tank 1, a feeding component, a continuous drying component and a discharging component;

[0041] The continuous drying component comprises a primary evaporation section 5, a secondary drying section 7 and a tertiary drying section 10 installed between the feeding component and the discharging component, an air inlet jacket 9 installed on the peripheral side of the tertiary drying section 10, a secondary jacket 901 installed on the peripheral side of the secondary drying section 7, and a primary jacket 902 installed on the peripheral side of the primary evaporation section 5; the feeding component, the primary evaporation section 5, the secondary drying section 7, the tertiary drying section 10, and the discharging component are sequentially connected in series by tangent ports; the evaporation section is not limited to one, two or more stages, and the drying section is also not limited to four, five or more stages, and more stages can be set as required; the air inlet jacket 9, the secondary jacket 901 and the primary jacket 902 are sequentially connected in series by tangent ports, and the gas-solid two-phase flow direction in the continuous drying component is opposite to the steam flow direction in the jacket;

[0042] A first tangent port 4 is connected between the feeding assembly and the primary evaporation section 5, a second tangent port 6 is connected between the primary evaporation section 5 and the secondary drying section 7, a third tangent port 701 is connected between the secondary drying section 7 and the tertiary drying section 10, and a fourth tangent port 11 is connected between the tertiary drying section 10 and the discharging assembly; a steam tangent port 22 is arranged on the periphery of the air inlet jacket 9, a sight glass 24 is installed at the end of the primary evaporation section 5, through which the evaporation of the material in the primary evaporation section 5 can be quickly seen, and a high-speed crushing impeller 8 is installed on the inner wall of the third tangent port 701, and the high-speed crushing impeller 8 is driven by a motor on the outer wall.

[0043] Steam enters the air inlet jacket 9 from the steam tangent port 22, causing the steam to move in a rotating direction in the jacket. The rapid rotational motion generates centrifugal force, causing the condensate to quickly leave the heating surface of the jacket, thereby weakening the resistance of the liquid to the gas and improving the heat transfer coefficient. The steam and condensate are exported along the tangential direction of the air inlet jacket 9, and then move in the secondary jacket 901 and the primary jacket 902 in turn along the tangential direction. The condensed water is finally discharged from the condensate outlet of the primary evaporation section 5.

[0044] The feeding assembly includes a vacuum pump 27, a feed pump 28 installed at the discharge end of the raw material liquid tank 1, a venturi ejector 3 installed at the connecting end of the first tangent port 4, and an ultra-high temperature instantaneous sterilization section 2 installed between the feed pump 28 and the venturi ejector 3. A sterilization jacket 903 is installed around the ultra-high temperature instantaneous sterilization section 2, and a steam tangent port 22 is also provided around the sterilization jacket 903. Condensate outlets are provided around the primary jacket 902 and the sterilization jacket 903.

[0045] The heating surfaces of the primary evaporation section 5, the secondary drying section 7, the tertiary drying section 10 and the ultra-high temperature instantaneous sterilization section 2 are made of mirror-polished stainless steel to prevent the formation of dirt, improve the heat and mass transfer efficiency and the quality of the product, and the heating surface can also be formed by spraying enamel or Teflon.

[0046] The discharging assembly comprises a rotating gas-solid separator 12 connected to the discharging end of the fourth cutting port 11 , and a screw conveyor 13 installed at the unloading end of the rotating gas-solid separator 12 .

[0047] The air outlet of the rotary gas-solid separator 12 is connected to a condenser 23, and the air outlet of the condenser 23 is connected to a vacuum pump 27. An air-water separation tank 26 is installed at the output end of the vacuum pump 27. The condensate discharge port of the condenser 23 is connected to a condensate tank 25 through a pipeline. The air inlet end of the venturi ejector 3 is an inert gas inlet. The air-water separation tank 26 is connected to the inert gas inlet through a pipeline. The air-water separation tank 26 returns the separated inert gas to the venturi ejector 3.

[0048] As can be seen from the above, the vacuum pump 27 is turned on. When the vacuum degree in the system reaches minus 0.090Mpa, the vacuum degree can be set according to the actual operation. The material in the raw material liquid tank 1 is fed into the ultra-high temperature instantaneous sterilization section 2 through the feed pump 28. The material absorbs the heat of the steam in the sterilization jacket 903, and the instantaneous temperature rises by 115-132 degrees Celsius. The residence time is 5-20 seconds. The sterilization temperature and residence time are set according to different materials and then enter the venturi ejector 3. The high-temperature material entering the venturi ejector 3 is mixed with the inert gas entering. After mixing, the gas-liquid two-phase is ejected through the nozzle of the venturi ejector 3, and flash evaporation occurs under vacuum. The material temperature is instantly reduced, and the volume rapidly expands to 70 times the original volume and atomizes into a turbulent mist point through the first tangent port 4, and then enters the primary evaporation section 5 from the tangent direction;

[0049] The gas-liquid two-phase entering from the tangential direction generates a high angular momentum, causing the gas and material to rotate at high speed in the evaporation section. Due to the centrifugal force generated by the high-speed rotation, the material with high density is continuously renewed and evaporated on the heating surface, which greatly improves the evaporation efficiency. After completing the process in the primary evaporation section 5, the gas-solid two-phase enters the secondary drying section 7 from the tangential direction of the second tangent port 6. The high-concentration material and gas entering the secondary drying section 7 rotate at high speed, and the rotation generates centrifugal force, causing the high-concentration material (like a wet ball) to move quickly on the heating surface, rotate quickly, evaporate quickly, and be continuously sheared and renewed, and the specific surface area is continuously increased (this process is a high-speed rotation distribution. The relative speed between the gas and the material is more than ten times higher than that of the fluidized bed, and its heat transfer and mass transfer efficiency is more than 10 times that of the fluidized bed dryer). Under the vacuum state, the material instantly diffuses the moisture in the wet bulb to the surface to complete the evaporation and drying. After completion, the powder and gas rotate to the tangent port at the other end, and the powder in the third tangent port 701 is crushed by high speed. The impeller 8 breaks up the large-particle agglomerate powder and the residual viscous wet ball material at high speed. The powder and gas after high-speed crushing are exported from the tangential direction, and then enter the third-stage drying section 10 from the tangential direction. After the powder and gas entering the third-stage drying section 10 are evaporated and dried again, the process is the same as that of the second-stage drying section 7. The gas-solid two-phase enters the rotating gas-solid separator 12 along the tangential direction from the fourth tangential port 11. The powder and gas entering the rotating gas-solid separator 12 rotate at high speed, generating centrifugal force, so that the powder with high specific gravity is The inner wall of the rotating gas-solid separator 12 moves downward in a spiral direction and enters the screw conveyor 13, and the gas moves upward to leave the separator and enter the shell side of the condenser 23. The heat of the gas entering the shell side is condensed by the cooling water and becomes condensed water. The condensed water enters the condensate tank 25 for collection and discharge, and the non-condensable gas is discharged by the vacuum pump 27 and discharged through the gas-water separation tank 26. The separated inert gas part is returned to the inert gas inlet of the Venturi 3 through the connecting pipe for heat recovery to improve utilization efficiency and reduce energy consumption.

[0050] The device is provided with a continuous drying component, a feeding component and a discharging component. The flow direction of the gas-solid two-phase in the continuous drying component is opposite to the flow direction of the steam in the jacket. The countercurrent method can increase the temperature difference between the gas-solid two-phase and the steam, thereby strengthening the heat transfer process. The steam temperature is higher and the temperature of the gas-solid two-phase is lower. The countercurrent makes the temperature difference between the two phases always larger during the contact process, which is conducive to the rapid transfer of heat to the material and improves the drying efficiency. The countercurrent enables the gas-solid two-phase to absorb the heat of the steam to the maximum extent during the flow process. The steam gradually cools down during the heat transfer process, while the gas-solid two-phase gradually heats up and completes the drying, thereby realizing the full utilization of thermal energy, reducing energy consumption, and reducing the drying cost.

[0051] Since the heat transfer is more complete and uniform, the material can be dried more effectively in each drying stage, ensuring the consistency and stability of the drying quality and reducing product quality problems caused by uneven drying. In addition, the countercurrent method can flexibly adjust the heat supply according to the humidity changes of the material in different drying stages to better meet the drying requirements of each stage.

[0052] The steam moves in a rotating direction in the jacket, generating centrifugal force to make the condensate leave the heating surface quickly, weakening the liquid resistance, improving the heat transfer coefficient, and greatly improving the evaporation efficiency. The tangent ports of the drying sections at each level are connected in series to achieve continuous drying of the material, reduce pauses and interferences in the intermediate links, and ensure the stability and consistency of the drying process. In the secondary drying section 7 and the tertiary drying section 10, the material rotates at high speed, evaporates, shears and renews quickly, the specific surface area increases, the heat and mass transfer efficiency is significantly improved, and the drying effect is better; through the high-speed crushing impeller 8, large-particle agglomerates and residual viscous wet ball materials are broken up at high speed to make the material more uniform, which is conducive to subsequent processing and drying; through the rotating gas-solid separator 12, the gas-solid two-phase rotates at high speed to generate centrifugal force to achieve effective separation, which is convenient for separate processing and collection.

[0053] Embodiment 2: As shown in the attached Figure 1 and attached Figure 4 As shown: this embodiment is basically the same as the previous embodiment, except that a liquid nitrogen inlet 1301 is connected to the side of the screw conveyor 13, and a powder outlet 1302 is provided at the end of the screw conveyor 13.

[0054] As can be seen from the above, the powder entering the screw conveyor 13 is mixed with the incoming liquid nitrogen;

[0055] The mixing process is as follows:

[0056] 1. Rapidly cool the powder;

[0057] 2. Allow the residual water in the powder to be evaporated by nitrogen;

[0058] 3. Replace the residual air in the powder to avoid cross contamination;

[0059] 4. The powder is quickly frozen to a sub-zero temperature, making the powder looser, improving product quality, and greatly increasing the shelf life of the product. The powder is finally pushed out of the powder outlet 1302 by the screw conveyor 13. Since there is no air contact with the packaging during this process, the growth of E. coli is prevented, thereby ensuring the quality of the product.

[0060] Embodiment 3: As shown in the attached Figure 1 , Attachment Figure 5 and attached Fig. 9 As shown: On the basis of Example 1, a washing component is installed at the continuous drying assembly, and the washing component includes a washing liquid tank 14, a washing water circulation pump 29, a rotating washing pipe 20 installed between the first evaporation section 5, the second drying section 7, the third drying section 10 and the washing water circulation pump 29, a spray nozzle 21 opened on the side of the rotating washing pipe 20, and a washing liquid inlet 16 connected to the end of the rotating washing pipe 20. Three groups of washing liquid inlets 16 are connected in parallel with the washing water circulation pump 29, and a dynamic seal 15 is installed at the washing liquid inlet 16.

[0061] The inner walls of the primary evaporation section 5, the secondary drying section 7, and the tertiary drying section 10 are all installed with a washing tube center positioning bearing 17, and the rotating washing tube 20 is connected to the washing tube center positioning bearing 17. A plurality of washing tube pushing pieces 19 are fixed to the inner wall of the liquid inlet end of the rotating washing tube 20. The liquid inlet end of the rotating washing tube 20 is a conical tubular structure and a closed arc swirl blade 18 is installed inside.

[0062] From the above, we can see that after the dryer has been running for a period of time, dirt will always be generated on the heating wall surface. In order to improve production efficiency, the heating surface can be made cleaner and meet GMP hygiene standards.

[0063] Turn on the washing water circulation pump 29, and the washing water is sent into the washing liquid inlet 16 and passes through the closed arc swirl blades 18. The closed arc swirl blades 18 change the flow direction of the washing liquid, so that the washing liquid forms a rotating flow. The liquid in the rotating flow pushes the washing tube pushing piece 19, so that the rotating washing tube 20 rotates 360 degrees quickly, and the washing water is sprayed onto the inner wall of the heating tube through the spray nozzle 21 for 360-degree automatic cleaning without dead ends (cleaning process: the greater the flow and pressure of the washing water pump, the greater the liquid driving force, the faster the washing tube rotates, and the better the cleaning effect).

[0064] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multiphase rotary flow vacuum continuous dryer, characterized in that: It comprises a raw material liquid tank (1), a material feeding component, a continuous drying component and a material discharging component; The continuous drying component comprises a primary evaporation section (5) installed between a material feeding component and a material discharging component, a secondary drying section (7) and a tertiary drying section (10), an air inlet jacket (9) installed on the peripheral side of the tertiary drying section (10), a secondary jacket (901) installed on the peripheral side of the secondary drying section (7), and a primary jacket (902) installed on the peripheral side of the primary evaporation section (5); The feeding assembly, the primary evaporation section (5), the secondary drying section (7), the tertiary drying section (10), and the discharging assembly are sequentially connected in series via tangent ports; the air inlet jacket (9), the secondary jacket (901), and the primary jacket (902) are sequentially connected in series via tangent ports, and the gas-solid two-phase flow direction in the continuous drying assembly is opposite to the steam flow direction in the jacket.

2. A multiphase rotary flow vacuum continuous dryer as claimed in claim 1, characterized in that: A first tangent opening (4) is connected between the feed assembly and the primary evaporation section (5), a second tangent opening (6) is connected between the primary evaporation section (5) and the secondary drying section (7), a third tangent opening (701) is connected between the secondary drying section (7) and the tertiary drying section (10), and a fourth tangent opening (11) is connected between the tertiary drying section (10) and the discharge assembly; and a steam tangent opening (22) is provided on the circumferential side of the air inlet jacket (9).

3. A multiphase rotary flow vacuum continuous dryer as claimed in claim 2, characterized in that: The feeding assembly comprises a vacuum pump (27), a feed pump (28) installed at the discharge end of the raw material liquid tank (1), a venturi ejector (3) installed at the connection end of the first tangent port (4), and an ultra-high temperature instantaneous sterilization section (2) installed between the feed pump (28) and the venturi ejector (3). A sterilization jacket (903) is installed on the peripheral side of the ultra-high temperature instantaneous sterilization section (2), and a steam tangent port (22) is also provided on the peripheral side of the sterilization jacket (903). Condensate outlets are provided on the peripheral sides of the primary jacket (902) and the sterilization jacket (903).

4. A multiphase rotary flow vacuum continuous dryer as claimed in claim 3, characterized in that: The discharging assembly comprises a rotating gas-solid separator (12) connected to the discharging end of the fourth tangent port (11), and a screw conveyor (13) installed at the discharging end of the rotating gas-solid separator (12).

5. A multiphase rotary flow vacuum continuous dryer as claimed in claim 4, characterized in that: The peripheral side of the screw conveyor (13) is connected to a liquid nitrogen inlet (1301), and the end of the screw conveyor (13) is provided with a powder outlet (1302).

6. A multiphase rotary flow vacuum continuous dryer as claimed in claim 4, characterized in that: The air outlet of the rotary gas-solid separator (12) is connected to a condenser (23), and the air outlet of the condenser (23) is connected to a vacuum pump (27). The output end of the vacuum pump (27) is equipped with a gas-water separation tank (26). The condensate discharge port of the condenser (23) is connected to a condensate tank (25) via a pipeline. The air inlet of the venturi ejector (3) is an inert gas inlet. The gas-water separation tank (26) is connected to the inert gas inlet via a pipeline. The gas-water separation tank (26) returns the separated inert gas to the venturi ejector (3).

7. A multiphase rotary flow vacuum continuous dryer as claimed in claim 6, characterized in that: A high-speed crushing impeller (8) is installed on the inner wall of the third tangent opening (701).

8. A multiphase rotary flow vacuum continuous dryer as claimed in claim 1 or 7, characterized in that: The continuous drying assembly is provided with a washing component, the washing component comprising a washing liquid tank (14), a washing water circulation pump (29), a rotating washing pipe (20) installed between the primary evaporation section (5), the secondary drying section (7), the tertiary drying section (10) and the washing water circulation pump (29), a spray nozzle (21) provided on the peripheral side of the rotating washing pipe (20), and a washing liquid inlet (16) connected to the end of the rotating washing pipe (20). The three groups of washing liquid inlets (16) are connected in parallel with the washing water circulation pump (29), and a dynamic seal (15) is installed at the washing liquid inlet (16).

9. A multiphase rotary flow vacuum continuous dryer as claimed in claim 8, characterized in that: The inner walls of the primary evaporation section (5), the secondary drying section (7) and the tertiary drying section (10) are all installed with a washing pipe center positioning bearing (17); the rotating washing pipe (20) is connected to the washing pipe center positioning bearing (17); a plurality of washing pipe pushing pieces (19) are fixed to the inner wall of the liquid inlet end of the rotating washing pipe (20); the liquid inlet end of the rotating washing pipe (20) is a conical tubular structure and is internally installed with a closed arc-shaped swirl blade (18).

10. A multiphase rotary flow vacuum continuous dryer as claimed in claim 1, characterized in that: A sight glass (24) is installed at the end of the primary evaporation section (5); the heating surfaces of the primary evaporation section (5), the secondary drying section (7), the tertiary drying section (10) and the ultra-high temperature instantaneous sterilization section (2) are made of mirror-polished stainless steel; and the heating surfaces of the primary evaporation section (5), the secondary drying section (7), the tertiary drying section (10) and the ultra-high temperature instantaneous sterilization section (2) are subjected to spraying treatment.

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