Water-alcohol dual-purpose MVR (Mechanical Vapor Recompression) evaporator

Abstract

The invention provides a water-alcohol dual-purpose MVR (mechanical vapor recompression) evaporator which comprises a water storage tank, a water evaporator and an alcohol evaporator, wherein the water storage tank is used for accommodating most of water extract; the water evaporator is used for accommodating a small part of water extract; a water vapor heat energy transfer system is arranged between the water evaporator and the alcohol evaporator, the water vapor heat energy transfer system comprises a snakelike heating pipe which is annularly arranged on the outer side of the alcohol evaporator and heats the alcohol evaporator, and an air inlet of the snakelike heating pipe is connected with a steam outlet of the water evaporator through a first pipeline; an alcohol steam heat energy transfer system is further arranged between the water evaporator and the alcohol evaporator and comprises a heat exchanger. According to the water-alcohol dual-purpose MVR evaporator, synchronous evaporation and concentration of a water extracting solution and an alcohol extracting solution in the same set of equipment are realized, and energy consumption required by the water evaporator is reduced while an alcohol solvent is produced and recovered.

Description

TECHNICAL FIELD

[0001] The present application relates to an evaporator, in particular to a water-alcohol dual-purpose MVR evaporator. BACKGROUND

[0002] In the evaporation and concentration process in the fields of traditional Chinese medicine, plant extraction and biological fermentation, it is often necessary to process extraction liquid with water as solvent and extraction liquid with alcohol, methanol and other alcohols as solvent. At present, the industry generally uses traditional, independent equipment and step-by-step processing technology to concentrate and recover alcohol solvents for the above two kinds of extraction liquid.

[0003] Firstly, in the processing of alcohol extraction liquid, low-concentration alcohol and de-alcohol concentrated extraction liquid are obtained by evaporation and de-alcohol through traditional concentration equipment, and then purified by relying on an independent alcohol recovery rectification tower. Secondly, in the processing of water extraction liquid, a set of MVR evaporator is often used to remove water from the liquid medicine. Two sets of independent evaporation systems need to be configured for water and alcohol production lines in the whole workshop, which has high idle rate of equipment, large floor area, and the heat energy released in the condensation process of alcohol vapor and the heat energy generated by water vapor is usually directly taken away by ordinary cooling water and discharged into the environment, which cannot be effectively utilized, resulting in energy waste. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a water-alcohol dual-purpose MVR evaporator, which comprises a water storage tank containing most of the water extraction liquid, a water evaporator containing a small part of the water extraction liquid, and an alcohol evaporator containing the alcohol extraction liquid. A water vapor heat energy transfer system is arranged between the water evaporator and the alcohol evaporator, and the water vapor heat energy transfer system comprises a serpentine heating pipe arranged outside the alcohol evaporator and heated by the alcohol evaporator. The gas inlet of the serpentine heating pipe is connected with the steam outlet of the water evaporator through a first pipeline. An alcohol vapor heat energy transfer system is also arranged between the water evaporator and the alcohol evaporator, and the alcohol vapor heat energy transfer system comprises a heat exchanger. The hot end inlet of the heat exchanger is connected with the steam outlet of the alcohol evaporator through a second pipeline, and the hot end outlet of the heat exchanger is connected with a collection tank for collecting recovered alcohol solvent after condensation. The cold end inlet of the heat exchanger is connected with the liquid outlet of the water storage tank through a third pipeline, and the cold end outlet of the heat exchanger is connected with the feed inlet of the water evaporator through a fourth pipeline.

[0005] To achieve the above object, under the premise that alcohol vapor does not directly enter the vapor compressor, the water and alcohol extraction liquids are simultaneously evaporated and concentrated in the same set of equipment through the cooperation of the water evaporator and the alcohol evaporator. The serpentine heating pipe is used as the external heating structure of the alcohol evaporator. The water vapor generated by the water evaporator is used as the main heat source of the external heating structure of the alcohol evaporator through the setting of the water vapor heat energy transmission system, thereby reducing the heating energy consumption required by the water evaporator. The heat energy released by the condensation of the alcohol vapor is used to preheat the water extraction liquid through the setting of the heat exchanger, thereby reducing the energy consumption required by the water evaporator, reducing the equipment investment and the floor area, improving the energy efficiency, and reducing the procurement cost of fresh alcohol solvent and the subsequent waste liquid treatment cost.

[0006] Further, the heat exchanger comprises a shell, a partition plate is arranged in the inner cavity of the shell, and the inner cavity of the shell is divided into independent first filter cavities and second filter cavities by the partition plate; the hot end inlet and the cold end inlet of the heat exchanger are located at the position of the first filter cavities, and the hot end outlet and the cold end outlet of the heat exchanger are located at the position of the second filter cavities; the first filter cavities are provided with a filter preheating assembly for preliminarily preheating and filtering the water extraction liquid entering the first filter cavities and preliminarily condensing the alcohol vapor; and the second filter cavities are provided with a heat exchange assembly for heating the water extraction liquid entering the second filter cavities and condensing the pure steam.

[0007] Further, the filter preheating assembly comprises an embedded heating flow channel arranged in the inner cavity groove wall of the first filter cavities, and the water inlet of the embedded heating flow channel is in communication with the hot end inlet; the filter preheating assembly further comprises a filter shell body fixedly arranged in the first filter cavities, the inner cavity of the filter shell body is provided with a first partition plate, a second partition plate and a third partition plate, and a filter cartridge adapted to the first partition plate, the second partition plate and the third partition plate is arranged between the first partition plate, the second partition plate and the third partition plate; the first partition plate, the second partition plate, the third partition plate and the filter cartridge divide the inner cavity of the filter shell body into independent feed buffer cavities, feed filter cavities, filter residue cavities and discharge cavities; the filter shell body is provided with a feed pipe in communication with the feed buffer cavities and the first filter cavities, a residue discharge pipe in communication with the outside of the heat exchanger and the filter residue cavities, and a discharge pipe arranged in the discharge cavities.

[0008] In the above design, the alcohol vapor enters the embedded heating flow channel from the hot end inlet, and the water extraction liquid enters the first filter cavities from the cold end inlet. The water extraction liquid promotes the condensation of the alcohol vapor, and the alcohol vapor preliminarily heats the water extraction liquid.

[0009] Further, the first partition plate is provided with a first communication hole penetrating therethrough, so that the feed buffer cavity is communicated with the feed filtering cavity; a second communication hole is formed between the second partition plate and the end of the filter cartridge, so that the feed filtering cavity is communicated with the residue cavity; a third communication hole is formed between the second partition plate and the third partition plate, so that the feed filtering cavity is communicated with the discharge cavity; the water extraction liquid forms a flow path from the feed buffer cavity, enters the inside of the filter cartridge through the first communication hole, completes the filtering by passing through the wall of the filter cartridge, and then flows into the discharge cavity through the third communication hole.

[0010] In the above design, the water extraction liquid in the first filtering cavity is preheated by alcohol vapor in the embedded heating flow channel, enters the feed buffer cavity through the feed pipe, then enters the feed filtering cavity through the first communication hole, and can only enter the filter cartridge due to the contact between the outer wall of the filter cartridge and the wall surfaces of the first partition plate, the second partition plate and the third partition plate, so as to perform filtering. The filter cartridge can not only filter the suspended matter in the water extraction liquid, but also defoam the part of the foam generated by the water extraction liquid due to heating.

[0011] Further, the filter housing is further provided with a defoaming assembly for removing the foam generated after the water extraction liquid is preheated.

[0012] Further, the defoaming assembly comprises a stirring shaft arranged coaxially with the filter cartridge in the filter cartridge, the stirring shaft is fixed with defoaming blades matched with the filter cartridge, and the end of the stirring shaft penetrates out of the filter cartridge and is rotationally connected with the filter cartridge; a transmission sleeve rotationally connected with the stirring shaft is arranged outside the stirring shaft, the transmission sleeve is fixedly connected with the filter cartridge, the transmission sleeve and the stirring shaft respectively extend and penetrate out of the filter housing and the shell, and the shell is fixed with a power motor for driving the stirring shaft and the transmission sleeve to rotate at the same or different rotating speeds.

[0013] Further, the heat exchange assembly comprises a heat exchange pipe arranged in the second filtering cavity and arranged in a serpentine shape, the water inlet of the heat exchange pipe penetrates through the partition plate and is communicated with the discharge pipe, the water outlet of the heat exchange pipe is communicated with the cold end outlet of the heat exchanger, the water outlet of the embedded heating flow channel penetrates through the partition plate into the second filtering cavity, and the inner cavity of the second filtering cavity is communicated with the hot end outlet of the heat exchanger.

[0014] Further, the water evaporator is further provided with a steam compressor on the side; 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.

[0015] In the above design, by arranging the steam compressor, a closed loop circulation 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, so as to further reduce the energy consumption required by the water evaporator.

[0016] Further, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are provided with conveying pumps for conveying materials.

[0017] Further, the water evaporator, the alcohol evaporator, the heat exchanger and the steam compressor are arranged on a steel structure platform.

[0018] To sum up, the water-alcohol dual-purpose MVR evaporator has the following beneficial effects: The water-alcohol dual-purpose MVR evaporator, under the premise that alcohol vapor does not directly enter the steam compressor, realizes the synchronous evaporation and concentration of water and alcohol extract in the same set of equipment through the cooperation of the water evaporator and the alcohol evaporator. The serpentine heating pipe serves as an external heating structure of the alcohol evaporator. The water vapor generated by the water evaporator is used as the main heat source of the external heating structure of the alcohol evaporator through the setting of the water vapor heat energy transmission system, reducing the heating energy consumption of the water evaporator. The heat energy released by the condensation of alcohol vapor is used to preheat the water extract through the setting of the heat exchanger, reducing the energy consumption of the water evaporator, reducing the equipment investment and land area, and improving the energy efficiency, reducing the procurement cost of fresh alcohol solvent and the subsequent waste liquid treatment cost.

[0019] The water-alcohol dual-purpose MVR evaporator, the water extract in the first filter cavity is preheated by alcohol vapor in the embedded heating flow channel, enters the feed buffer cavity through the feed pipe, and then enters the feed filter cavity through the first communication hole. Since the outer wall of the filter cartridge is in contact with the wall surfaces of the first, second and third partition plates, it can only enter the filter cartridge for filtration. The filter cartridge can not only filter the suspended solids in the water extract, but also defoam part of the foam generated by the water extract due to heating, avoiding the blockage of the heat exchange pipe by the foam and suspended solids generated by heating. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described and explained with reference to the accompanying drawings.

[0021] Figure 1 is a schematic diagram of the overall structure of the preferred embodiment of the application; Figure 2 is a schematic diagram of the partial cross-sectional structure of the shell of the preferred embodiment of the application; Figure 3 is a schematic diagram of the cross-sectional structure of the filter housing of the preferred embodiment of the application.

[0022] 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

[0023] 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.

[0024] like Figures 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. 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 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.

[0025] In the above design, the water evaporator 1 is used for the evaporation and concentration of the water extract, the alcohol evaporator 2 is used for the evaporation and concentration of the alcohol extract, the water evaporator 1 and the alcohol evaporator 2 are both composed of a heater and a vapor-liquid separator, a temperature sensor, a pressure sensor, a steam connection pipe, a condensate connection pipe, a vacuum connection pipe and a liquid level meter are arranged on each vapor-liquid separator, and a thermal insulation layer is further arranged, the thermal insulation layer is filled with thermal insulation material between the vapor-liquid separator outer wall, and the outer layer is covered by 304 stainless steel. Through the cooperation of the water evaporator 1 and the alcohol evaporator 2, the synchronous evaporation and concentration of the water extract and the alcohol extract in the same set of equipment is realized. The serpentine heating pipe is used as the external heating structure of the alcohol evaporator 2. The water vapor generated by the water evaporator 1 is used as the main heat source of the external heating structure of the alcohol evaporator 2 through the setting of the water vapor heat energy transfer system, so as to reduce the heating energy consumption required by the water evaporator 1. The waste heat released by the condensation of the alcohol vapor is used to preheat the water extract through the setting of the heat exchanger 5, so as to reduce the energy consumption required by the water evaporator 1, reduce the equipment investment and land area, improve the energy efficiency, and reduce the procurement cost of fresh alcohol solvent and the subsequent waste liquid treatment cost.

[0026] As shown in Figure 2 , the heat exchanger 5 includes a shell 10, a partition plate 11 is arranged in the inner cavity of the shell 10, and the inner cavity of the shell 10 is divided into independent first filter cavity 12 and second filter cavity 13 by the partition plate 11; the hot end inlet 6 and the cold end inlet 8 of the heat exchanger 5 are located at the position of the first filter cavity 12, and the hot end outlet 7 and the cold end outlet 9 of the heat exchanger 5 are both located at the position of the second filter cavity 13; the first filter cavity 12 is provided with a filter preheating assembly for preliminarily preheating and filtering the water extract entering the first filter cavity 12 and preliminarily condensing the alcohol vapor; the second filter cavity 13 is provided with a heat exchange assembly for heating the water extract entering the second filter cavity 13 and condensing the pure steam.

[0027] Through the setting of the filter preheating assembly, the suspended solids in the water extract are filtered out, and the water extract preliminarily condenses the alcohol vapor, and the heat energy released in the condensation process preliminarily heats the water extract. Through the setting of the heat exchange assembly, the condensation heat of the alcohol vapor flowing through is used to deeply heat the water extract from the first cavity which has been filtered and preheated, and the water extract deeply heated enters the water evaporator 1, so as to reduce the required heating energy consumption.

[0028] As shown in Figure 2 and Figure 3As shown, the filter preheating assembly comprises an embedded heating flow channel 14 arranged in the inner cavity of the first filter cavity 12, and the water inlet of the embedded heating flow channel 14 is communicated with the hot end inlet 6; the filter preheating assembly further comprises a filter housing 15 fixedly arranged in the first filter cavity 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 cartridge 19 is arranged between the first partition plate 16, the second partition plate 17 and the third partition plate 18; the first partition plate 16, the second partition plate 17, the third partition plate 18 and the filter cartridge 19 divide the inner cavity of the filter housing 15 into a feeding buffer cavity 20, a feeding filter cavity 21, a filter residue cavity 22 and a discharging cavity 23 which are independent of each other; the filter housing 15 is provided with a feeding pipe 24 which communicates the feeding buffer cavity 20 and the first filter cavity 12, a residue discharging pipe 25 which communicates the outside of the heat exchanger 5 and the filter residue cavity 22, and a discharging pipe 26 arranged in the discharging cavity 23. The alcohol vapor enters the embedded heating flow channel 14 from the hot end inlet 6, and the water extract enters the first filter cavity 12 from the cold end inlet 8, so that the alcohol vapor is condensed by the water extract, and the water extract is preliminarily heated by the alcohol vapor.

[0029] The first partition plate 16 is provided with a first communication hole 27, so that the feeding buffer cavity 20 and the feeding filter cavity 21 are communicated; the second partition plate 17 and the end of the filter cartridge 19 form a second communication hole 28, so that the feeding filter cavity 21 and the filter residue cavity 22 are communicated; the second partition plate 17 and the third partition plate 18 form a third communication hole 29, so that the feeding filter cavity 21 and the discharging cavity 23 are communicated; the water extract forms a flow path from the feeding buffer cavity 20, enters the inside of the filter cartridge 19 through the first communication hole 27, passes through the wall of the filter cartridge 19 to complete the filtration, and then flows into the discharging cavity 23 through the third communication hole 29.

[0030] The water extract in the first filter cavity 12 is preliminarily heated by the alcohol vapor in the embedded heating flow channel 14, enters the feeding buffer cavity 20 through the feeding pipe 24, and then enters the feeding filter cavity 21 through the first communication hole 27, and since the outer wall of the filter cartridge 19 is in contact with the walls of the first partition plate 16, the second partition plate 17 and the third partition plate 18, the water extract can only enter the filter cartridge 19 to be filtered, and the filter cartridge 19 can not only filter the suspended solids in the water extract, but also defoam the part of the foam generated by the water extract due to heating.

[0031] The filter housing 15 is further provided with a defoaming assembly for removing the foam generated after the water extract is preliminarily heated.

[0032] The defoaming assembly comprises a stirring shaft arranged coaxially in the filter cartridge 19 and fixed with the filter cartridge 19, and a defoaming blade fixed on the stirring shaft and matched with the filter cartridge 19, the end of the stirring shaft penetrating out of the filter cartridge 19 and rotationally connected with the filter cartridge 19; a transmission sleeve rotationally connected with the stirring shaft is arranged outside the stirring shaft, the transmission sleeve is fixedly connected with the filter cartridge 19, and the transmission sleeve and the stirring shaft respectively extend out of the filter housing 15 and the shell 10, and the shell 10 is fixed with a power motor for driving the stirring shaft and the transmission sleeve to rotate at the same or different speeds.

[0033] By arranging the defoaming blade driven by the power motor coaxially in the filter cartridge 19, the defoaming blade is broken by rotation, and the rotation of the filter cartridge 19 can strip the foam and filter residue attached to the surface of the filter cartridge 19, thereby realizing the multiple composite effects of efficient defoaming, preventing the heat exchanger 5 from being blocked, and maintaining the stable heat exchange and condensation effect of the water extract under heating.

[0034] The stirring shaft, the transmission sleeve and the residue discharge pipe 25 are respectively provided with sealing structures at the penetrating connection positions of the filter cartridge 19 and the heat exchanger 5 shell 10, so as to realize the reliable sealing between the rotating parts and the fixed shell.

[0035] The filter cartridge 19 is hollow in the inner cavity, one end is closed, the side wall and the other end are both filter plates for filtering the water extract, and a rubber sealing ring is fixed on the side wall, so that the foam and suspended matter adhered to the side wall after being filtered by the filter cartridge 19 cannot enter the discharge cavity 23.

[0036] As shown in Figure 2 The heat exchange assembly comprises a heat exchange pipe 30 arranged in the second filter cavity 13 in a serpentine manner, the water inlet of the heat exchange pipe 30 penetrating through the partition plate 11 and being communicated with the discharge pipe 26, and the water outlet of the heat exchange pipe 30 being communicated with the cold end outlet 9 of the heat exchanger 5; the water outlet of the embedded heating flow channel 14 penetrating through the partition plate 11 into the second filter cavity 13, and the inner cavity of the second filter cavity 13 being communicated with the hot end outlet 7 of the heat exchanger 5. The penetrating connection positions of the embedded heating flow channel 14 and the partition plate 11 are provided with sealing structures, so as to avoid the alcohol vapor entering the first filter cavity 12 and mixing with the water extract.

[0037] The water evaporator 1 is also provided with a steam compressor; the air inlet of the steam compressor is connected to another steam outlet of the water evaporator 1 through a fifth pipeline, and the air outlet of the steam compressor is connected to another feeding port of the water evaporator 1 through a sixth pipeline. The steam compressor is composed of an impeller (rotor), a volute, a base, an oil tank, a gear box, an electric motor, an oil cooler, monitoring instruments, steam inlet and outlet pipes, cooling water inlet and outlet pipes, steam seal steam pipes, drainage pipes and blowdown pipes. By arranging the steam compressor, a closed loop circulation formed by the fifth pipeline and the second pipeline 4 is constructed, the low-temperature and low-pressure steam discharged in the traditional evaporation is converted into reusable high-temperature and high-pressure steam through the steam compressor, and then enters the water evaporator 1 again, so that the waste heat is reused and the energy consumption of the water evaporator 1 is further reduced.

[0038] The first pipeline 3, the second pipeline 4, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all provided with conveying pumps for conveying materials. The first pipeline 3, the second pipeline 4, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are also provided with valves for controlling the opening and closing of the pipelines and monitoring instruments, the valves are used for manually or automatically controlling the operating parameters, and the monitoring instruments and the valves are used for monitoring and controlling the temperature, pressure, flow, liquid level, high-speed shaft vibration value, density and the like.

[0039] The water evaporator 1, the alcohol evaporator 2, the heat exchanger 5 and the steam compressor are all arranged on a steel structure platform. The steel structure platform is used for installing and supporting the water evaporator 1, the alcohol evaporator 2, the heat exchanger 5, the steam compressor, the conveying pump and other equipment, and also has a platform for daily maintenance, repair and operation.

[0040] In use, the power is turned on and the switch is opened. The application also has a vacuum station which provides a vacuum source for the system. The vacuum station is started to perform a vacuumizing operation on the entire system including the water evaporator 1, the alcohol evaporator 2 and related pipelines, so that the system reaches a preset negative pressure operating environment. Then the water extract to be treated is pumped into the water storage tank and the water evaporator 1. Then the heater of the water evaporator 1 is turned on to generate water vapor in the water evaporator 1. The steam compressor is turned on, and the conveying pump of the water evaporator 1 is also turned on. The water vapor in the water evaporator 1 is changed into high-temperature and high-pressure steam through the steam compressor. The high-temperature and high-pressure steam is sent back to the water evaporator 1 through the sixth pipeline, so that the energy consumption of the water evaporator 1 is reduced. The heater in the alcohol evaporator 2 is also turned on to generate alcohol steam. The temperature of the water extract in the water storage tank is relatively low. 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 filtering cavity 12. The alcohol steam in the alcohol evaporator 2 is pumped into the hot end inlet 6 of the heat exchanger 5 and enters the embedded heating flow channel 14. The water extract in the first filtering cavity 12 cools the alcohol steam in the embedded heating flow channel 14, and at the same time, the alcohol steam preliminarily preheats the water extract. The water extract after initial preheating produces some foam, the water extract containing the foam enters the feed buffer cavity 20 in the filter housing 15, and enters the feed filter cavity 21 through the first communication hole 27, is filtered through the filter cartridge 19, part of the foam is defoamed by the filter cartridge 19, and the suspended substances are intercepted by the filter cartridge 19 and adhere to the outer wall of the filter cartridge 19. The defoaming blades rotate to break the remaining medicinal liquid foam, the filtered water extract passes through the filter cartridge 19 and enters the discharge cavity 23, and then enters the heat exchange pipe 30 through the discharge pipe 26, and the alcohol vapor in the embedded heating flow channel 14 enters the second filter cavity 13 and is further condensed by the water extract with lower temperature, and the water extract in the heat exchange pipe 30 is gradually heated until it is discharged from the cold end outlet 9 of the heat exchanger 5 into the water evaporator 1, thereby further reducing the heat load of the water evaporator 1, and the recovered alcohol solvent after condensation enters the collection tank; After the device is used for a period of time, the filter cartridge 19 is rotated to strip the suspended substances adhered to the filter cartridge 19 from the filter cartridge 19 and make them fall into the filter residue cavity 22, and then are discharged from the residue discharge pipe 25 when use is finished, and the heat exchanger 5 can be backwashed to prevent the filter holes of the filter cartridge 19 from being blocked and improve the service life.

[0041] The above specific embodiments only describe the preferred embodiments of the present application, and do not limit the protection scope of the present application. Various modifications, substitutions and improvements of the technical solutions of the present application made by those skilled in the art according to the description and drawings of the present application without departing from the design concept and spirit of the present application shall all belong to the protection scope of the present application. The protection scope of the present application is determined by the claims.

Claims

1. A water-alcohol dual-purpose MVR evaporator, characterized in that, The water storage tank contains most of the water extract, the water evaporator (1) contains a small amount of water extract, and the alcohol evaporator (2) contains alcohol extract; The water vapor heat energy transfer system is arranged between the water evaporator (1) and the alcohol evaporator (2), and includes a serpentine heating pipe arranged outside the alcohol evaporator (2) and heating the alcohol evaporator (2), and an air inlet of the serpentine heating pipe is connected with a steam outlet of the water evaporator (1) through a first pipeline (3); The alcohol vapor heat energy transfer system is also arranged between the water evaporator (1) and the alcohol evaporator (2), and includes a heat exchanger (5), a hot end inlet (6) of the heat exchanger (5) is connected with a steam outlet of the alcohol evaporator (2) through a second pipeline (4), a hot end outlet (7) of the heat exchanger (5) is connected with a collecting tank for collecting recovered alcohol solvent after condensation, a cold end inlet (8) of the heat exchanger (5) is connected with a liquid outlet of the water storage tank through a third pipeline, and a cold end outlet (9) of the heat exchanger (5) is connected with a feeding inlet of the water evaporator (1) through a fourth pipeline.

2. The water-alcohol dual MVR evaporator according to claim 1, characterized in that, The heat exchanger (5) includes an outer shell (10), and the inner cavity of the outer shell (10) is provided with a partition plate (11), and the inner cavity of the outer shell (10) is divided into independent first filter cavities (12) and second filter cavities (13) by the partition plate (11); The hot end inlet (6) and the cold end inlet (8) of the heat exchanger (5) are located at the first filter cavities (12), and the hot end outlet (7) and the cold end outlet (9) of the heat exchanger (5) are located at the second filter cavities (13); The first filter cavities (12) are provided with a filter preheating assembly for preheating and filtering the water extract entering the first filter cavities (12) and preliminarily condensing alcohol vapor; The second filter cavities (13) are provided with a heat exchange assembly for heating the water extract entering the second filter cavities (13) and condensing pure steam.

3. The water-alcohol dual MVR evaporator according to claim 2, characterized in that, The filter preheating assembly includes an embedded heating flow channel (14) arranged in the inner cavity groove wall of the first filter cavities (12), and a water inlet of the embedded heating flow channel (14) is in communication with the hot end inlet (6); The filter preheating assembly further includes a filter shell (15) fixedly arranged in the first filter cavities (12), the inner cavity of the filter shell (15) is provided with a first partition plate (16), a second partition plate (17) and a third partition plate (18), and a filter cartridge (19) is arranged between the first partition plate (16), the second partition plate (17) and the third partition plate (18); The first partition plate (16), the second partition plate (17), the third partition plate (18) and the filter cartridge (19) divide the inner cavity of the filter shell (15) into independent feeding buffer cavities (20), feeding filter cavities (21), filter residue cavities (22) and discharging cavities (23); The filter shell (15) is provided with a feeding pipe (24) for connecting the feeding buffer cavities (20) and the first filter cavities (12), a residue discharging pipe (25) for connecting the outside of the heat exchanger (5) and the filter residue cavities (22), and a discharging pipe (26) arranged in the discharging cavities (23).

4. The water-alcohol dual-purpose MVR evaporator according to claim 3, characterized in that, The first partition plate (16) is provided with a first communication hole (27) penetrating through the first partition plate (16), so that the feed buffer cavity (20) is communicated with the feed filtering cavity (21); The second partition plate (17) and the end of the filter cylinder (19) are provided with a second communication hole (28), so that the feed filtering cavity (21) is communicated with the filter residue cavity (22); The second partition plate (17) and the third partition plate (18) are provided with a third communication hole (29), so that the feed filtering cavity (21) is communicated with the discharge cavity (23); The water extraction liquid forms a flow path from the feed buffer cavity (20), enters the inside of the filter cylinder (19) through the first communication hole (27), and flows into the discharge cavity (23) through the third communication hole (29) after filtering through the wall of the filter cylinder (19).

5. The water-alcohol dual MVR evaporator according to claim 4, characterized in that, The filter shell (15) is further provided with a defoaming assembly for removing the foam generated after the water extraction liquid is preheated.

6. The water-alcohol dual-purpose MVR evaporator according to claim 5, characterized in that, The defoaming assembly comprises a stirring shaft arranged coaxially in the filter cylinder (19), the stirring shaft is fixed with defoaming blades matched with the filter cylinder (19), and the end of the stirring shaft penetrates out of the filter cylinder (19) and is rotationally connected with the filter cylinder (19); The stirring shaft is provided with a transmission sleeve rotationally connected with the stirring shaft, the transmission sleeve is fixedly connected with the filter cylinder (19), the transmission sleeve and the stirring shaft respectively extend and penetrate out of the filter shell (15) and the outer shell (10), and the outer shell (10) is fixedly provided with a power motor for driving the stirring shaft and the transmission sleeve to rotate at the same or different speeds.

7. The water-alcohol dual-purpose MVR evaporator according to claim 3, characterized in that, The heat exchange assembly comprises a heat exchange pipe (30) arranged in the second filtering cavity (13) and arranged in a serpentine shape, the water inlet of the heat exchange pipe (30) penetrates through the partition plate (11) and is communicated with the discharge pipe (26), and the water outlet of the heat exchange pipe (30) is communicated with the cold end outlet (9) of the heat exchanger (5); The water outlet of the embedded heating flow channel (14) penetrates through the partition plate (11) into the second filtering cavity (13), and the inner cavity of the second filtering cavity (13) is communicated with the hot end outlet (7) of the heat exchanger (5).

8. The water-alcohol dual-purpose MVR evaporator according to claim 1, characterized in that, The water evaporator (1) is further provided with a steam compressor on the side; The steam compressor is connected to another steam outlet of the water evaporator (1) through a fifth pipeline, and the steam compressor is connected to another feed inlet of the water evaporator (1) through a sixth pipeline.

9. The water-alcohol dual-purpose MVR evaporator according to claim 8, 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 provided with a conveying pump for conveying materials.

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

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