Water-alcohol dual-purpose MVR evaporator

Abstract

The application provides a water-alcohol dual-purpose MVR evaporator, which comprises a water storage tank for containing most of water extract, a water evaporator for containing a small amount of water extract and an alcohol evaporator for containing alcohol extract; a water vapor heat energy transmission system is arranged between the water evaporator and the alcohol evaporator, the water vapor heat energy transmission system comprises a serpentine heating pipe arranged outside the alcohol evaporator and used for heating the alcohol evaporator, an air inlet of the serpentine heating pipe is connected with a steam outlet of the water evaporator through a first pipeline, and an alcohol vapor heat energy transmission system is further arranged between the water evaporator and the alcohol evaporator, the alcohol vapor heat energy transmission system comprises a heat exchanger. The water-alcohol dual-purpose MVR evaporator realizes synchronous evaporation and concentration of the water extract and the alcohol extract in the same set of equipment, recovers alcohol solvent and reduces the energy consumption of the water evaporator.

Description

Technical Field

[0001] This invention relates to evaporators, and more specifically to a water-alcohol dual-purpose MVR evaporator. Background Technology

[0002] In the evaporation and concentration processes of traditional Chinese medicine, plant extraction, and bio-fermentation, it is usually necessary to process extracts with water as a solvent and extracts with alcohols such as ethanol and methanol as solvents. Currently, the industry generally uses traditional, separate equipment and step-by-step processes to concentrate the above two types of extracts and recover the alcohol solvent.

[0003] Firstly, in the treatment of alcohol extract, the alcohol is first evaporated and de-alcoholized using traditional concentration equipment to obtain low-concentration alcohol and de-alcoholized concentrated extract, which is then purified using an independent alcohol recovery distillation tower. Secondly, in the treatment of water extract, an MVR evaporator is often used to remove water from the liquid. The entire workshop needs to be equipped with two independent evaporation systems for the water and alcohol production lines, resulting in high equipment idle rate and large footprint. Furthermore, the heat energy released by alcohol vapor during condensation and the heat energy generated by water vapor are usually directly carried away by ordinary cooling water and discharged into the environment, which is not effectively utilized and results in energy waste. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention proposes a water-alcohol dual-purpose MVR evaporator, comprising a water storage tank for containing most of the water extract, a water evaporator for containing a small portion of the water extract, and an alcohol evaporator for containing the alcohol extract.

[0005] A water vapor heat transfer system is provided between the water evaporator and the alcohol evaporator. The water vapor heat transfer system includes a serpentine heating tube that is arranged around the outside of the alcohol evaporator and heats it. The air inlet of the serpentine heating tube is connected to the steam outlet of the water evaporator through a first pipeline.

[0006] An alcohol vapor heat transfer system is also provided between the water evaporator and the alcohol evaporator. The alcohol vapor heat transfer system includes a heat exchanger. The hot end inlet of the heat exchanger is connected to the steam outlet of the alcohol evaporator through a second pipeline. The hot end outlet of the heat exchanger is connected to a collection tank for collecting and recovering the alcohol solvent after condensation. The cold end inlet of the heat exchanger is connected to the liquid outlet of the water storage tank through a third pipeline. The cold end outlet of the heat exchanger is connected to the feed inlet of the water evaporator through a fourth pipeline.

[0007] To achieve the above objectives, this application, without directly introducing alcohol vapor into the steam compressor, utilizes a combination of a water evaporator and an alcohol evaporator to achieve simultaneous evaporation and concentration of water and alcohol extracts within the same equipment. A serpentine heating tube serves as the external heating structure of the alcohol evaporator. By setting up a water vapor heat transfer system, the water vapor generated by the water evaporator is used as the main heat source for the external heating structure of the alcohol evaporator, reducing the heating energy consumption required by the water evaporator. Furthermore, by setting up a heat exchanger, the heat energy released from the condensation of alcohol vapor is used to preheat the hot water extract, thereby reducing the energy consumption required by the water evaporator while recovering the alcohol solvent. This reduces equipment investment and floor space requirements, improves energy efficiency, and lowers the procurement cost of fresh alcohol solvent and subsequent waste liquid treatment costs.

[0008] Furthermore, the heat exchanger includes a shell, the inner cavity of which is provided with a partition, and the inner cavity of the shell is divided into an independent first filtration chamber and a second filtration chamber by the partition; the hot end inlet and cold end inlet of the heat exchanger are located in the first filtration chamber, and the hot end outlet and cold end outlet of the heat exchanger are both located in the second filtration chamber; the first filtration chamber is provided with a filtration preheating component for preheating and filtering the water extract entering the first filtration chamber, and for pre-condensing the alcohol vapor; the second filtration chamber is provided with a heat exchange component for heating the water extract entering the second filtration chamber and for condensing the pure vapor.

[0009] Furthermore, the filter preheating assembly includes an embedded heating channel disposed in the inner wall of the first filter chamber, the inlet of the embedded heating channel being connected to the hot end inlet; the filter preheating assembly also includes a filter housing fixed inside the first filter chamber, the inner cavity of the filter housing being provided with a first partition plate, a second partition plate and a third partition plate, and a filter cylinder adapted to the first partition plate, the second partition plate and the third partition plate being disposed between them; the first partition plate, the second partition plate, the third partition plate and the filter cylinder divide the inner cavity of the filter housing into an independent feed buffer chamber, a feed filter chamber, a filter cake chamber and a discharge chamber; the filter housing is provided with a feed pipe connecting the feed buffer chamber and the first filter chamber, a slag discharge pipe connecting the outside of the heat exchanger and the filter cake chamber and a discharge pipe disposed in the discharge chamber.

[0010] In the above design, alcohol vapor enters the embedded heating channel through the hot end inlet, and water extract enters the first filtration chamber through the cold end inlet. The water extract promotes the condensation of alcohol vapor, and the alcohol vapor provides preliminary heating to the water extract.

[0011] Furthermore, a first connecting hole is formed through the first partition plate, connecting the feed buffer chamber and the feed filter chamber; a second connecting hole is formed between the second partition plate and the end of the filter cylinder, connecting the feed filter chamber and the filter residue chamber; a third connecting hole is formed between the second partition plate and the third partition plate, connecting the feed filter chamber and the discharge chamber; the water extract forms a flow path from the feed buffer chamber, through the first connecting hole into the filter cylinder, through the filter cylinder wall to complete filtration, and then flows into the discharge chamber through the third connecting hole.

[0012] In the above design, the water extract in the first filtration chamber is preheated by alcohol vapor in the embedded heating channel, and then enters the feed buffer chamber through the feed pipe. After that, it enters the feed filtration chamber through the first connecting hole. Since the outer wall of the filter cylinder is in contact with the walls of the first partition plate, the second partition plate and the third partition plate, it can only enter the filter cylinder for filtration. The filter cylinder can not only filter the suspended solids in the water extract, but also defoam some of the foam generated by the heating of the water extract.

[0013] Furthermore, the filter housing is also equipped with an antifoaming component for removing foam generated after the water extract is preheated.

[0014] Furthermore, the defoaming assembly includes a stirring shaft disposed inside the filter cylinder and arranged coaxially with the filter cylinder. Defoaming blades adapted to the filter cylinder are fixed on the stirring shaft. The end of the stirring shaft extends out of the filter cylinder and is rotatably connected to the filter cylinder. A transmission sleeve rotatably connected to the stirring shaft is provided outside the stirring shaft. The transmission sleeve is fixedly connected to the filter cylinder. The transmission sleeve and the stirring shaft extend out of the filter housing and the outer shell, respectively. A power motor is fixed on the outer shell to drive the stirring shaft and the transmission sleeve to rotate at the same or different speeds.

[0015] Furthermore, the heat exchange assembly includes a heat exchange tube arranged in a serpentine pattern in the second filter chamber. The inlet of the heat exchange tube passes through the partition and is connected to the outlet pipe. The outlet of the heat exchange tube is connected to the cold end outlet of the heat exchanger. The outlet of the embedded heating channel passes through the partition and enters the second filter chamber. The inner cavity of the second filter chamber is connected to the hot end outlet of the heat exchanger.

[0016] Furthermore, a steam compressor is also provided on the side of the water evaporator; the air inlet of the steam compressor is connected to another steam outlet of the water evaporator through a fifth pipeline, and the air outlet of the steam compressor is connected to another feed inlet of the water evaporator through a sixth pipeline.

[0017] In the above design, by setting up a steam compressor, a closed loop formed by the fifth pipeline and the second pipeline is constructed. The low-temperature and low-pressure steam discharged in the traditional evaporation is converted into reusable high-temperature and high-pressure steam by the steam compressor and then enters the water evaporator again, further reducing the energy consumption required by the water evaporator.

[0018] Furthermore, the first, second, third, fourth, fifth, and sixth pipelines are all equipped with conveying pumps for conveying materials.

[0019] Furthermore, the water evaporator, alcohol evaporator, heat exchanger, and steam compressor are all mounted on a steel structure platform.

[0020] In summary, this water-alcohol dual-purpose MVR evaporator has the following beneficial effects:

[0021] This water-alcohol dual-purpose MVR evaporator, without the alcohol vapor directly entering the steam compressor, achieves simultaneous evaporation and concentration of water and alcohol extracts within the same equipment through the cooperation of water and alcohol evaporators. The serpentine heating tube serves as the external heating structure of the alcohol evaporator. By setting up a water vapor heat energy transfer system, the water vapor generated by the water evaporator is used as the main heat source for the external heating structure of the alcohol evaporator, reducing the heating energy consumption required by the water evaporator. Furthermore, by setting up a heat exchanger, the heat energy released by the condensation of alcohol vapor is used to preheat the hot water extract, thereby reducing the energy consumption required by the water evaporator while producing recovered alcohol solvent. This reduces equipment investment and floor space requirements, improves energy efficiency, and lowers the procurement cost of fresh alcohol solvent and subsequent waste liquid treatment costs.

[0022] In this water-alcohol dual-purpose MVR evaporator, the water extract in the first filtration chamber is preheated by alcohol vapor in the embedded heating channel, and then enters the feed buffer chamber through the feed pipe. After that, it enters the feed filtration chamber through the first connecting hole. Since the outer wall of the filter cylinder is in contact with the walls of the first, second and third partition plates, it can only enter the filter cylinder for filtration. The filter cylinder can not only filter the suspended solids in the water extract, but also defoam some of the foam generated by the heating of the water extract, so as to avoid the foam and suspended solids generated by heating from clogging the heat exchange tube. Attached Figure Description

[0023] The invention will now be further described and explained with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the preferred embodiment of the present invention;

[0025] Figure 2 This is a partial cross-sectional view of the outer shell structure according to the preferred embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of the filter housing according to the preferred embodiment of the present invention.

[0027] Reference numerals: 1. Water evaporator; 2. Alcohol evaporator; 3. First pipeline; 4. Second pipeline; 5. Heat exchanger; 6. Hot end inlet; 7. Hot end outlet; 8. Cold end inlet; 9. Cold end outlet; 10. Shell; 11. Baffle plate; 12. First filter chamber; 13. Second filter chamber; 14. Embedded heating channel; 15. Filter housing; 16. First partition plate; 17. Second partition plate; 18. Third partition plate; 19. Filter cylinder; 20. Feed buffer chamber; 21. Feed filter chamber; 22. Filter residue chamber; 23. Discharge chamber; 24. Feed pipe; 25. Slag discharge pipe; 26. Discharge pipe; 27. First connecting hole; 28. Second connecting hole; 29. ​​Third connecting hole; 30. Heat exchange tube. Detailed Implementation

[0028] The technical solution of the present invention will be more clearly and completely explained below with reference to the accompanying drawings and through the description of preferred embodiments of the present invention.

[0029] like Figure 1-3 As shown, a preferred embodiment of the present invention provides a water-alcohol dual-purpose MVR evaporator, which includes a water storage tank for containing most of the water extract, a water evaporator 1 for containing a small portion of the water extract, and an alcohol evaporator 2 for containing the alcohol extract.

[0030] A water vapor heat transfer system is provided between the water evaporator 1 and the alcohol evaporator 2. The water vapor heat transfer system includes a serpentine heating tube that is arranged around the outside of the alcohol evaporator 2 and heats it. The air inlet of the serpentine heating tube is connected to the steam outlet of the water evaporator 1 through a first pipe 3.

[0031] An alcohol vapor heat transfer system is also provided between the water evaporator 1 and the alcohol evaporator 2. The alcohol vapor heat transfer system includes a heat exchanger 5. The hot end inlet 6 of the heat exchanger 5 is connected to the steam outlet of the alcohol evaporator 2 through a second pipe 4. The hot end outlet 7 of the heat exchanger 5 is connected to a collection tank for collecting and recovering alcohol solvent after condensation. The cold end inlet 8 of the heat exchanger 5 is connected to the liquid outlet of the water storage tank through a third pipe. The cold end outlet 9 of the heat exchanger 5 is connected to the feed inlet of the water evaporator 1 through a fourth pipe.

[0032] In the above design, water evaporator 1 is used for the evaporation and concentration of the water extract, and alcohol evaporator 2 is used for the evaporation and concentration of the alcohol extract. Both water evaporator 1 and alcohol evaporator 2 consist of a heater and a vapor-liquid separator. Each vapor-liquid separator is equipped with a temperature sensor, a pressure sensor, a steam connection, a condensate connection, a vacuum connection, and a level gauge. They are also covered with an insulation layer, with insulation material filling the space between the insulation layer and the outer wall of the vapor-liquid separator. The outer layer is covered with 304 stainless steel. Through the cooperation of water evaporator 1 and alcohol evaporator 2, the simultaneous evaporation and concentration of water and alcohol extracts within the same equipment is achieved. In the first-step evaporation and concentration process, the serpentine heating tube serves as the external heating structure of the alcohol evaporator 2. By setting up a water vapor heat energy transfer system, the water vapor generated by the water evaporator 1 is used as the main heat source for the external heating structure of the alcohol evaporator 2, reducing the heating energy consumption required by the water evaporator 1. Furthermore, by setting up a heat exchanger 5, the waste heat released by the condensation of alcohol vapor is used to preheat the hot water extract. This process reduces the energy consumption required by the water evaporator 1 while producing recovered alcohol solvent, thereby reducing equipment investment and floor space requirements, improving energy efficiency, and lowering the procurement cost of fresh alcohol solvent and subsequent waste liquid treatment costs.

[0033] like Figure 2 As shown, the heat exchanger 5 includes a shell 10, and a partition 11 is provided in the inner cavity of the shell 10. The inner cavity of the shell 10 is divided into an independent first filter chamber 12 and a second filter chamber 13 by the partition 11. The hot end inlet 6 and the cold end inlet 8 of the heat exchanger 5 are located in the first filter chamber 12, and the hot end outlet 7 and the cold end outlet 9 of the heat exchanger 5 are both located in the second filter chamber 13. The first filter chamber 12 is provided with a filtration and preheating component for preheating and filtering the water extract entering the first filter chamber 12 and for pre-condensing the alcohol vapor. The second filter chamber 13 is provided with a heat exchange component for heating the water extract entering the second filter chamber 13 and for condensing the pure vapor.

[0034] By setting up a filtration and preheating component, suspended solids in the water extract are filtered out while the water extract undergoes preliminary condensation of alcohol vapor. The heat energy released during the condensation process then preheats the water extract. By setting up a heat exchange component, the condensation heat of the flowing alcohol vapor is used to deeply heat the filtered and preheated water extract from the first chamber. The deeply heated water extract then enters the water evaporator 1, reducing the required heating energy consumption.

[0035] like Figure 2 and Figure 3As shown, the filter preheating assembly includes an embedded heating channel 14 disposed in the inner wall of the first filter chamber 12, and the inlet of the embedded heating channel 14 is connected to the hot end inlet 6; the filter preheating assembly also includes a filter housing 15 fixed inside the first filter chamber 12, and the inner cavity of the filter housing 15 is provided with a first partition plate 16, a second partition plate 17 and a third partition plate 18, and a filter cylinder 19 adapted to the first partition plate 16, the second partition plate 17 and the third partition plate 18 is disposed between them; the first partition plate 16, the second partition plate 17, the third partition plate 18 and the filter cylinder 19 divide the inner cavity of the filter housing 15 into an independent feed buffer chamber 20, a feed filter chamber 21, a filter cake chamber 22 and a discharge chamber 23; the filter housing 15 is provided with a feed pipe 24 connecting the feed buffer chamber 20 and the first filter chamber 12, a slag discharge pipe 25 connecting the outside of the heat exchanger 5 and the filter cake chamber 22 and a discharge pipe 26 disposed in the discharge chamber 23. The alcohol vapor enters the embedded heating channel 14 through the hot end inlet 6, and the water extract enters the first filter chamber 12 through the cold end inlet 8. The water extract promotes the condensation of the alcohol vapor, and the alcohol vapor provides preliminary heating to the water extract.

[0036] A first connecting hole 27 is formed through the first partition plate 16, connecting the feed buffer chamber 20 and the feed filter chamber 21; a second connecting hole 28 is formed between the second partition plate 17 and the end of the filter cylinder 19, connecting the feed filter chamber 21 and the filter residue chamber 22; a third connecting hole 29 is formed between the second partition plate 17 and the third partition plate 18, connecting the feed filter chamber 21 and the discharge chamber 23; the water extract forms a flow path from the feed buffer chamber 20, through the first connecting hole 27 into the filter cylinder 19, passes through the filter cylinder 19 wall to complete filtration, and then flows into the discharge chamber 23 through the third connecting hole 29.

[0037] The water extract in the first filter chamber 12 is preheated by alcohol vapor in the embedded heating channel 14, and then enters the feed buffer chamber 20 through the feed pipe 24. After that, it enters the feed filter chamber 21 through the first connecting hole 27. Since the outer wall of the filter cylinder 19 is in contact with the walls of the first partition plate 16, the second partition plate 17 and the third partition plate 18, it can only enter the filter cylinder 19 for filtration. The filter cylinder 19 can not only filter the suspended solids in the water extract, but also defoam some of the foam generated by the heating of the water extract.

[0038] The filter housing 15 is also equipped with a defoaming component to remove foam generated after the water extract is preheated.

[0039] The defoaming assembly includes a stirring shaft disposed inside and coaxially arranged with the filter cylinder 19. Defoaming blades adapted to the filter cylinder 19 are fixed on the stirring shaft. The end of the stirring shaft extends out of the filter cylinder 19 and is rotatably connected to the filter cylinder 19. A transmission sleeve rotatably connected to the stirring shaft is provided on the outer sleeve of the stirring shaft. The transmission sleeve is fixedly connected to the filter cylinder 19. The transmission sleeve and the stirring shaft extend out of the filter housing 15 and the outer shell 10, respectively. A power motor is fixed on the outer shell 10 to drive the stirring shaft and the transmission sleeve to rotate at the same or different speeds.

[0040] By coaxially installing defoaming blades driven by a motor inside the filter cylinder 19, the defoaming blades rotate to break up the foam in the medicine liquid, while the rotation of the filter cylinder 19 can peel off the foam and filter residue attached to the surface of the filter cylinder 19, thus achieving multiple combined effects of efficient defoaming, preventing blockage of the heat exchanger 5, and maintaining stable heat exchange and condensation of the water extract under heating conditions.

[0041] The stirring shaft, transmission sleeve, and slag discharge pipe 25 are all connected to the filter cylinder 19 and the outer shell 10 of the heat exchanger 5 by a sealing structure to achieve a reliable seal between the rotating parts and the fixed shell.

[0042] The filter cylinder 19 has a hollow inner cavity, one end is closed, and the side wall and the other end are filter plates for filtering water extract. A rubber sealing ring is fixed on the side wall to prevent foam and suspended matter that have been filtered by the filter cylinder 19 and adhered to the side wall from entering the discharge chamber 23.

[0043] like Figure 2 As shown, the heat exchange assembly includes heat exchange tubes 30 arranged in a serpentine pattern within the second filter chamber 13. The inlet of the heat exchange tubes 30 penetrates the partition 11 and connects to the outlet pipe 26, while the outlet of the heat exchange tubes 30 connects to the cold end outlet 9 of the heat exchanger 5. The outlet of the embedded heating channel 14 penetrates the partition 11 and enters the second filter chamber 13, and the inner cavity of the second filter chamber 13 connects to the hot end outlet 7 of the heat exchanger 5. A sealing structure is provided at the penetration connection between the embedded heating channel 14 and the partition 11 to prevent alcohol vapor from entering the first filter chamber 12 and mixing with the water extract.

[0044] A steam compressor is also installed on the side of the water evaporator 1. The steam compressor's inlet is connected to another steam outlet of the water evaporator 1 through a fifth pipe, and the steam compressor's outlet is connected to another feed inlet of the water evaporator 1 through a sixth pipe. The steam compressor consists of an impeller (rotor), volute, base, oil tank, gearbox, motor, oil cooler, monitoring instruments, steam inlet and outlet pipes, cooling water inlet and outlet pipes, steam seal pipe, drainage pipe, and sewage discharge pipe. By installing the steam compressor, a closed-loop circulation is constructed by the fifth pipe and the second pipe 4. The low-temperature, low-pressure steam discharged in the traditional evaporation process is converted into reusable high-temperature, high-pressure steam by the steam compressor and re-enters the water evaporator 1, where waste heat is reused, further reducing the energy consumption required by the water evaporator 1.

[0045] Material conveying pumps are installed on pipelines 3, 4, 3, 4, 5, and 6. Valves and monitoring instruments are also installed on pipelines 3, 4, 5, and 6 to control pipeline flow. Valves are used for manual or automatic control of operating parameters, while the monitoring instruments and valves are used to monitor and control temperature, pressure, flow rate, liquid level, high-speed shaft vibration value, density, etc.

[0046] The water evaporator 1, alcohol evaporator 2, heat exchanger 5, and steam compressor are all mounted on a steel structure platform. The steel structure platform is used to install and support the water evaporator 1, alcohol evaporator 2, heat exchanger 5, steam compressor, transfer pump, and other equipment, as well as a platform for daily maintenance, inspection, and operation.

[0047] When in use, connect the power supply and turn on the switch. This application also includes a vacuum station, which provides a vacuum source for the system. Start the vacuum station to perform a vacuum operation on the entire system, including the water evaporator 1, the alcohol evaporator 2 and related pipelines, so that the system reaches the preset negative pressure operating environment. Then, pump the water extract to be treated into the water storage tank and the water evaporator 1. Then turn on the heater of the water evaporator 1 to generate water vapor in the water evaporator 1. Then turn on the steam compressor and start the delivery pump of the water evaporator 1 so that the water vapor in the water evaporator 1 is converted into high temperature and high pressure steam by the steam compressor. The high temperature and high pressure steam is sent back to the water evaporator 1 through the sixth pipeline to reduce the energy consumption required by the water evaporator 1.

[0048] Simultaneously, the heater in the alcohol evaporator 2 is turned on to generate alcohol vapor. The water extract in the water storage tank is at a lower temperature. The water extract in the water storage tank is pumped into the cold end inlet 8 of the heat exchanger 5 and enters the first filter chamber 12. The alcohol vapor in the alcohol evaporator 2 is pumped into the hot end inlet 6 of the heat exchanger 5 and enters the embedded heating channel 14. The water extract in the first filter chamber 12 cools the alcohol vapor in the embedded heating channel 14, while the alcohol vapor preheats the water extract.

[0049] The water extract after initial preheating will produce some foam. The water extract containing foam enters the feed buffer chamber 20 in the filter housing 15 and enters the feed filter chamber 21 through the first connecting hole 27. After being filtered by the filter cylinder 19, some foam is defoamed by the filter cylinder 19, and suspended matter is intercepted by the filter cylinder 19 and adheres to the outer wall of the filter cylinder 19. The defoaming blades rotate and break the remaining drug foam. The filtered water extract passes through the filter cylinder 19 and enters the discharge chamber 23. It enters the heat exchange tube 30 through the discharge pipe 26. The alcohol vapor in the embedded heating channel 14 will enter the second filter chamber 13 and continue to be condensed by the water extract at a lower temperature. The water extract in the heat exchange tube 30 will gradually heat up until it is discharged into the water evaporator 1 through the cold end outlet 9 of the heat exchanger 5, further reducing the heat load of the water evaporator 1. The recovered alcohol solvent after condensation will enter the collection tank.

[0050] After the device has been used for a period of time, the filter cylinder 19 is rotated to detach the suspended matter adhering to the filter cylinder 19 and let it fall into the filter cake chamber 22. When the device is no longer in use, it is discharged through the slag discharge pipe 25. The heat exchanger 5 can also be backwashed to prevent the filter holes of the filter cylinder 19 from becoming clogged and to improve its service life.

[0051] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided textual description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A water-alcohol dual-purpose MVR evaporator, characterized in that, It includes a water storage tank that holds most of the water extract, a water evaporator (1) that holds a small portion of the water extract, and an alcohol evaporator (2) that holds the alcohol extract. A water vapor heat transfer system is provided between the water evaporator (1) and the alcohol evaporator (2). The water vapor heat transfer system includes a serpentine heating tube that is arranged around the outside of the alcohol evaporator (2) and heats it. The air inlet of the serpentine heating tube is connected to the steam outlet of the water evaporator (1) through a first pipe (3). An alcohol vapor heat transfer system is also provided between the water evaporator (1) and the alcohol evaporator (2). The alcohol vapor heat transfer system includes a heat exchanger (5). The hot end inlet (6) of the heat exchanger (5) is connected to the steam outlet of the alcohol evaporator (2) through a second pipeline (4). The hot end outlet (7) of the heat exchanger (5) is connected to a collection tank for collecting and recovering alcohol solvent after condensation. The cold end inlet (8) of the heat exchanger (5) is connected to the liquid outlet of the water storage tank through a third pipeline. The cold end outlet (9) of the heat exchanger (5) is connected to the feed inlet of the water evaporator (1) through a fourth pipeline. The heat exchanger (5) includes a shell (10), and the inner cavity of the shell (10) is provided with a partition (11), and the inner cavity of the shell (10) is divided into an independent first filter chamber (12) and a second filter chamber (13) by the partition (11). The hot end inlet (6) and cold end inlet (8) of the heat exchanger (5) are located in the first filter chamber (12), and the hot end outlet (7) and cold end outlet (9) of the heat exchanger (5) are located in the second filter chamber (13). The first filter chamber (12) is provided with a filter preheating component for preheating and filtering the water extract entering the first filter chamber (12) and for pre-condensing the alcohol vapor. The second filter chamber (13) is equipped with a heat exchange component that heats the water extract entering the second filter chamber (13) and condenses the pure steam. The filter preheating assembly includes an embedded heating channel (14) disposed in the inner wall of the first filter chamber (12), and the inlet of the embedded heating channel (14) is connected to the hot end inlet (6). The filter preheating assembly also includes a filter housing (15) fixed inside the first filter chamber (12). The filter housing (15) has a first partition plate (16), a second partition plate (17) and a third partition plate (18) in its inner cavity. A filter cylinder (19) adapted to the first partition plate (16), the second partition plate (17) and the third partition plate (18) is provided between them. The first partition plate (16), the second partition plate (17), the third partition plate (18) and the filter cylinder (19) divide the inner cavity of the filter housing (15) into an independent feed buffer chamber (20), a feed filter chamber (21), a filter residue chamber (22) and a discharge chamber (23). The filter housing (15) is provided with a feed pipe (24) connecting the feed buffer chamber (20) and the first filter chamber (12), a slag discharge pipe (25) connecting the outside of the heat exchanger (5) and the slag chamber (22), and a discharge pipe (26) located in the discharge chamber (23).

2. The water-alcohol dual-purpose MVR evaporator according to claim 1, characterized in that, The first partition plate (16) has a first connecting hole (27) through it, so that the feed buffer chamber (20) is connected to the feed filter chamber (21); A second connecting hole (28) is formed between the end of the second partition plate (17) and the filter cylinder (19) to connect the feed filter chamber (21) and the filter residue chamber (22); A third connecting hole (29) is formed between the second partition plate (17) and the third partition plate (18) to connect the feed filter chamber (21) with the discharge chamber (23); The water extract forms a flow path from the feed buffer chamber (20), through the first connecting hole (27) into the filter cylinder (19), through the filter cylinder (19) wall to complete filtration, and then flows into the discharge chamber (23) through the third connecting hole (29).

3. The water-alcohol dual-purpose MVR evaporator according to claim 2, characterized in that, The filter housing (15) is also provided with a defoaming component for removing foam generated after the water extract is preheated.

4. The water-alcohol dual-purpose MVR evaporator according to claim 3, characterized in that, The defoaming assembly includes a stirring shaft disposed inside the filter cylinder (19) and arranged coaxially with the filter cylinder (19). The stirring shaft is fixed with defoaming blades adapted to the filter cylinder (19). The end of the stirring shaft extends out of the filter cylinder (19) and is rotatably connected to the filter cylinder (19). The stirring shaft is fitted with a transmission sleeve that is rotatably connected to the stirring shaft. The transmission sleeve is fixedly connected to the filter cylinder (19). The transmission sleeve and the stirring shaft extend and pass through the filter housing (15) and the outer shell (10), respectively. The outer shell (10) is fixed with a power motor that drives the stirring shaft and the transmission sleeve to rotate at the same or different speeds.

5. The water-alcohol dual-purpose MVR evaporator according to claim 1, characterized in that, The heat exchange assembly includes a heat exchange tube (30) arranged in a serpentine pattern in the second filter chamber (13). The inlet of the heat exchange tube (30) passes through the partition (11) and is connected to the outlet pipe (26). The outlet of the heat exchange tube (30) is connected to the cold end outlet (9) of the heat exchanger (5). The outlet of the embedded heating channel (14) passes through the partition (11) and enters the second filter chamber (13), and the inner cavity of the second filter chamber (13) is connected to the hot end outlet (7) of the heat exchanger (5).

6. The water-alcohol dual-purpose MVR evaporator according to claim 1, characterized in that, The water evaporator (1) is also provided with a steam compressor on the side; The steam compressor’s inlet is connected to the other steam outlet of the water evaporator (1) via a fifth pipe, and the steam compressor’s outlet is connected to the other feed inlet of the water evaporator (1) via a sixth pipe.

7. A water-alcohol dual-purpose MVR evaporator according to claim 6, characterized in that, The first pipeline (3), the second pipeline (4), the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all equipped with conveying pumps for conveying materials.

8. A water-alcohol dual-purpose MVR evaporator according to claim 7, characterized in that, The water evaporator (1), alcohol evaporator (2), heat exchanger (5), and steam compressor are all mounted on a steel structure platform.

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