Recovery device of wiped-film evaporator

Abstract

The utility model relates to the technical field of wiped-film evaporators, in particular to a wiped-film evaporator recovery device which comprises a wiped-film evaporator. The heat exchange device is installed at the output end of the wiped-film evaporator, the heat exchange device is provided with a heat exchange shell, a heat exchange assembly and a liquid outlet, and the heat exchange assembly is installed in the heat exchange shell; the filter screen is mounted in the middle of the heat exchange shell, and the heat exchange shell is divided into a residue area and a high-boiling liquid area by the filter screen. According to the utility model, the high-boiling residue separated by the wiped-film evaporator can be quickly cooled, the heat can be recovered, and the energy consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wiped film evaporators, and in particular to a recovery device for a wiped film evaporator. Background Art

[0002] A wiped film evaporator is a special evaporator that uses a rotating scraper or film wiper to increase the contact area between the liquid and the heating surface, thereby improving the evaporation efficiency. This type of evaporator is suitable for industrial processes that require high thermal efficiency and high evaporation rates, especially when dealing with high-viscosity, fouling-prone, or heat-sensitive materials.

[0003] The working principle of a wiped film evaporator is to evenly coat the liquid material on the heating surface through a distributor, and then scrape the liquid into a thin film by the rotation of the scraper to increase its contact area with the heating surface. In this way, the evaporation rate of the liquid on the heating surface will be greatly improved. At the same time, due to the thin thickness of the thin film, the material is heated for a shorter time, which helps to reduce thermal damage. The feeding process of the wiped film evaporator in the 1,4-butanediol device is that the material at the bottom of the salt tower is directly pumped into the wiped film evaporator through the salt tower reboiler pump for BDO recovery and high-boiling substance separation. Since the high-boiling substances separated from the wiped film evaporator are in a high-temperature state and contain various mixtures and impurities, they need to be cooled before separation. However, currently, the high-boiling substances separated from the wiped film evaporator are mainly separated after natural cooling, which not only takes a long cooling time but also wastes heat.

[0004] Therefore, those skilled in the art are committed to developing a recovery device for a wiped film evaporator, which can quickly cool the high-boiling substances separated from the wiped film evaporator and recover the heat, reducing energy consumption. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a recovery device for a wiped film evaporator, which can quickly cool the high-boiling substances separated from the wiped film evaporator and recover the heat, reducing energy consumption

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A recovery device for a wiped film evaporator, comprising

[0008] A wiped film evaporator;

[0009] A heat exchange device, the heat exchange device is installed at the output end of the wiped film evaporator, the heat exchange device has a heat exchange housing, a heat exchange component and a liquid outlet, and the heat exchange component is installed in the heat exchange housing;

[0010] A filter screen, the filter screen is installed in the middle of the heat exchange housing, and the filter screen divides the heat exchange housing into a residue area and a high-boiling liquid area.

[0011] The beneficial effects of adopting the above solution are as follows: After the mixed liquid evaporates the low-boiling liquid through the wiped film evaporator, the high-boiling liquid and particulate impurities enter the heat exchange device. The heat exchange device exchanges heat with the high-boiling liquid to reduce the temperature of the high-boiling liquid, which is conducive to heat recovery.

[0012] The filter screen filters out the particulate impurities in the high-boiling liquid, which is conducive to the subsequent recovery of the high-boiling liquid. At the same time, after the high-boiling liquid cools down, liquid level stratification occurs, which is conducive to the subsequent separate recovery of different liquids.

[0013] The liquid (softened water can be used) in the heat exchange component forms high-temperature liquid or low-pressure steam after being heated, which is convenient for heating other liquids subsequently.

[0014] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0015] Further, a collecting funnel is provided at the bottom of the residue area, and a stop valve is installed at the bottom of the collecting funnel.

[0016] The beneficial effects of adopting the above further solution are as follows: The particulate impurities gradually precipitate in the collecting funnel, and the stop valve is opened after a certain period of time to recover the particulate impurities.

[0017] Further, a cleaning device for cleaning the surface of the filter screen is installed on the heat exchange housing.

[0018] The beneficial effects of adopting the above further solution are as follows: The cleaning device is used to clean the surface of the filter screen, reducing the blockage of particulate impurities on the filter screen.

[0019] Further, the cleaning device includes a detachable sealing cover installed on the heat exchange housing. A telescopic assembly is installed on the sealing cover. The output end of the telescopic assembly extends into the heat exchange housing, and a brush head component is installed at the output end of the telescopic assembly. The surface of the brush head component abuts against the filter screen.

[0020] The beneficial effects of adopting the above further solution are as follows: The telescopic assembly drives the brush head component to move up and down to brush the surface of the filter screen, reducing the blockage of impurities on the surface of the filter screen.

[0021] Further, the heat exchange component includes a tube sheet and heat exchange tubes. The two tube sheets are installed in the heat exchange housing to divide the heat exchange housing into two liquid collecting chambers. A plurality of heat exchange tubes are installed between the two tube sheets to make the two liquid collecting chambers communicate with each other. A coolant inlet and a coolant outlet are respectively installed at both ends of the heat exchange housing.

[0022] The beneficial effects of adopting the above further solution are as follows: When the cooling liquid flows from one liquid collecting chamber into the other liquid collecting chamber, the high-temperature high-boiling liquid outside the heat exchange tubes heats the low-temperature liquid inside the heat exchange tubes, reducing the temperature of the high-temperature high-boiling liquid.

[0023] Further, the scraped film evaporator comprises an evaporator shell, a power device is mounted on the evaporator shell, a rotating shaft is mounted on the output end of the power device, the rotating shaft extends into the evaporator shell, and a scraper assembly is mounted on the rotating shaft;

[0024] A mixed liquid inlet and a low boiling point liquid outlet are installed on the upper side of the evaporator shell, and a heating component is also installed outside the evaporator shell.

[0025] The beneficial effect of adopting the above further solution is that the rotation of the power device drives the rotating shaft and the scraper assembly to rotate, and the mixed liquid is evenly applied to the inner surface of the evaporator shell, so that the low-boiling point liquid in the mixed gas evaporates quickly.

[0026] Furthermore, the scraper assembly includes a connecting rod, one end of which is fixedly connected to the rotating shaft, and the other end of the connecting rod is connected to a scraper, and the outer edge of the scraper abuts against the inner wall of the evaporator shell.

[0027] The beneficial effect of adopting the above further solution is that the rotation of the rotating shaft drives the connecting rod and the scraper to rotate.

[0028] Furthermore, a gas-liquid separator is installed in the evaporator shell.

[0029] The beneficial effect of adopting the above further solution is that the gas-liquid separator separates the gas and the liquid, thereby preventing the gas from directly carrying out part of the mixed liquid.

[0030] Furthermore, the heating assembly comprises a heating shell installed on the outer wall of the evaporator shell, and a steam outlet and a steam inlet are respectively installed on the upper side and the lower side of the heating shell.

[0031] The beneficial effect of adopting the above further solution is that high-temperature steam enters into the heating shell to heat the evaporator shell.

[0032] Furthermore, a confluence coil is installed in the evaporator shell, the confluence coil is communicated with the mixed liquid inlet, and a plurality of liquid outlet heads are installed on the confluence coil, and the liquid outlet heads face the inner wall of the evaporator shell.

[0033] The beneficial effect of adopting the above further solution is that the mixed liquid is sprayed on the inner wall of the evaporator shell, which is conducive to the subsequent scraper to evenly spread the mixed liquid on the inside of the evaporator shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural plan view of a scraped film evaporator recovery device according to a specific embodiment of the utility model;

[0035] Figure 2This is a schematic structural diagram of a cleaning device according to a specific embodiment of the present utility model.

[0036] In the drawings, the list of components represented by each reference numeral is as follows:

[0037] 1. Film scraping evaporator; 2. Heat exchange device; 3. Heat exchange housing; 4. Heat exchange component; 5. Liquid outlet; 6. Filter screen; 7. Residue area; 8. High-boiling liquid area; 9. Collection funnel; 10. Stop valve; 11. Cleaning device; 12. Sealing cover; 13. Telescopic component; 14. Brush head component; 15. Tube sheet; 16. Heat exchange tube; 17. Liquid collection cavity; 18. Coolant outlet; 19. Coolant inlet; 20. Evaporator housing; 21. Power device; 22. Rotating shaft; 23. Mixed liquid inlet; 24. Connecting rod; 25. Scraper; 26. Gas-liquid separator; 27. Heating housing; 28. Steam inlet; 29. Steam outlet; 30. Converging coil; 31. Liquid outlet head; 32. Low-boiling point liquid outlet. Specific embodiments

[0038] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0039] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0040] In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] Such as Figure 1 、 Figure 2As shown, a recovery device for a wiped film evaporator includes

[0043] a wiped film evaporator 1;

[0044] a heat exchange device 2, which is installed at the output end of the wiped film evaporator 1. The heat exchange device 2 has a heat exchange housing 3, a heat exchange component 4 and a liquid outlet 5, and the heat exchange component 4 is installed in the heat exchange housing 3;

[0045] a filter screen 6, which is installed in the middle of the heat exchange housing 3. The filter screen 6 divides the heat exchange housing 3 into a residue area 7 and a high-boiling liquid area 8.

[0046] In the present utility model, after the mixed liquid passes through the wiped film evaporator 1 to evaporate the low-boiling liquid, the high-boiling liquid and particulate impurities enter the heat exchange device 2. The heat exchange device 2 exchanges heat with the high-boiling liquid to reduce the temperature of the high-boiling liquid, which is beneficial to heat recovery;

[0047] The filter screen 6 filters the particulate impurities in the high-boiling liquid, which is beneficial to the subsequent recovery of the high-boiling liquid. At the same time, after the high-boiling liquid cools down, a liquid level stratification occurs, which is beneficial to the subsequent further separation and recovery of different liquids;

[0048] The liquid (which can be softened water) in the heat exchange component 4 is heated to form high-temperature liquid or low-pressure steam, which is convenient for heating other liquids subsequently.

[0049] As Figure 1 、 Figure 2 shown, in some embodiments, the bottom of the residue area 7 has a collection funnel 9, and a stop valve 10 is installed at the bottom of the collection funnel 9. When the impurity particles accumulate to a certain amount in the collection funnel 9, the stop valve 10 is opened to discharge the processed impurity particles, reducing the impurity content in the high-boiling liquid.

[0050] A cleaning device 11 for cleaning the surface of the filter screen 6 is installed on the heat exchange housing 3. Specifically, the cleaning device 11 includes a detachable sealing cover 12 installed on the heat exchange housing 3. A telescopic component 13 is installed on the sealing cover 12. The telescopic component 13 can be a cylinder or an electric cylinder. The output end of the telescopic component 13 extends into the heat exchange housing 3, and a brush head component 14 is installed at the output end of the telescopic component 13. The brush head component 14 can be a wire brush or a high-temperature resistant brush, and the surface of the brush head component 14 abuts against the filter screen 6.

[0051] As Figure 1As shown in the figure, in another embodiment, the heat exchange component 4 includes a tube sheet 15 and heat exchange tubes 16. Two tube sheets 15 are installed in the heat exchange housing 3 to divide the heat exchange housing 3 into two liquid collecting chambers 17. The two liquid collecting chambers 17 are respectively located at both ends of the heat exchange housing 3. A plurality of heat exchange tubes 16 are installed between the two tube sheets 15 to communicate the two liquid collecting chambers 17. A coolant inlet 19 and a coolant outlet 18 are respectively installed at both ends of the heat exchange housing 3. The coolant can be softened water or other liquids.

[0052] As Figure 1 shown in the figure, in this embodiment, the wiped film evaporator 1 includes an evaporator housing 20. A power device 21 is installed on the evaporator housing 20. The power device 21 can adopt a power motor and a speed reducer. The output end of the power device 21 is installed with a rotating shaft 22. The rotating shaft 22 extends into the evaporator housing 20. A scraper assembly is installed on the rotating shaft 22. A mixed liquid inlet 23 and a low boiling point liquid outlet 32 are installed on the upper side of the evaporator housing 20. A heating component is also installed outside the evaporator housing 20.

[0053] The mixed liquid inlet 23 is connected to a salt tower or a high boiling point tower. During the BDO production process, the feeding process of the 1,4 - butanediol evaporation using the wiped film evaporator 1 is that the material at the bottom of the salt tower is directly pumped into the wiped film evaporator 1 through the salt tower reboiler pump for BDO recovery and high boiling point substance separation. However, the operation effect is not good. The main influences are as follows: firstly, the wiped film separation effect is poor and BDO is wasted; secondly, the accumulation of high boiling point substances at the bottom of the high boiling point tower causes the quality of the BDO product to decline. At the same time, during normal operation, the high boiling point substances discharged from the bottom of the high boiling point tower are controlled to the bottom of the salt tower to control the content of high boiling point substances. Since the pipe diameter is DN25 and the size is small, the content of high boiling point substances at the bottom of the high boiling point tower cannot be effectively reduced, thus affecting the quality of the BDO product. Based on this, in this embodiment, the feeding process of the existing wiped film evaporator 1 is optimized, and a new feeding process from the high boiling point tower to the wiped film evaporator 1 is added. The pipe diameter is DN50. Through this pipeline, the material at the bottom of the high boiling point tower is directly sent into the wiped film evaporator for material recovery and separation. Since the bottom temperature of the H - B1 D tower is controlled at 170 °C during normal production, the bottom temperature of the wiped film evaporator 1 can be increased, the thermal efficiency can be improved, the evaporation efficiency can be improved, and the high boiling point substances in the system can be directly discharged after wiped film separation, avoiding the accumulation of high boiling point substances entering the system again and improving the product quality.

[0054] In some embodiments, the scraper assembly includes a connecting rod 24. One end of the connecting rod 24 is fixedly connected to the rotating shaft 22, and the other end of the connecting rod 24 is connected to a scraper 25. The outer edge of the scraper 25 abuts against the inner wall of the evaporator housing 20. The power device 21 drives the scraper 25 to rotate, and evenly smears the mixed liquid on the inner surface of the evaporator housing 20.

[0055] A gas - liquid separator 26 is also installed in the evaporator housing 20. The gas - liquid separator 26 separates gas and liquid to prevent part of the mixed liquid from being directly carried out by the gas.

[0056] The heating component includes a heating housing 27 installed on the outer wall of the evaporator housing 20. A vapor outlet 29 and a vapor inlet 28 are respectively installed on the upper and lower sides of the heating housing 27. During the BDO preparation process, the temperature in the evaporator housing 20 needs to be maintained at about 170°C. The high-temperature and high-pressure steam enables the evaporator housing 20 to continuously maintain an appropriate temperature. In other embodiments, the heating component can adopt electric heating or high-temperature gas heating.

[0057] A converging coil 30 is also installed in the evaporator housing 20. The converging coil 30 communicates with the mixed liquid inlet 23. A plurality of liquid outlets 31 are installed on the converging coil 30. The liquid outlets 31 face the inner wall of the evaporator housing 20. The liquid outlets 31 spray the mixed liquid on the inner wall of the evaporator housing 20, which is beneficial for the subsequent scraper 25 to evenly apply the mixture on the inside of the evaporator housing 20.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A scraped film evaporator recovery device, characterized in that: include Wiped film evaporator (1); A heat exchange device (2), the heat exchange device (2) being installed at the output end of the scraped film evaporator (1), the heat exchange device (2) comprising a heat exchange shell (3), a heat exchange component (4) and a liquid outlet (5), the heat exchange component (4) being installed in the heat exchange shell (3); A filter screen (6) is installed in the middle of the heat exchange shell (3), and the filter screen (6) separates the heat exchange shell (3) into a residue area (7) and a high boiling liquid area (8).

2. The wiped film evaporator recovery device according to claim 1, characterized in that: The bottom of the residue zone (7) is provided with a collecting funnel (9), and the bottom of the collecting funnel (9) is provided with a stop valve (10).

3. The wiped film evaporator recovery device according to claim 1, characterized in that: The heat exchange housing (3) is provided with a cleaning device (11) for cleaning the surface of the filter screen (6).

4. The wiped film evaporator recovery device according to claim 3, characterized in that: The cleaning device (11) comprises a detachable sealing cover (12) mounted on the heat exchange shell (3), a telescopic component (13) being mounted on the sealing cover (12), an output end of the telescopic component (13) extending into the heat exchange shell (3), and a brush head component (14) being mounted on the output end of the telescopic component (13), the surface of the brush head component (14) being in contact with the filter screen (6).

5. The wiped film evaporator recovery device according to claim 1, characterized in that: The heat exchange assembly (4) comprises a tube sheet (15) and a heat exchange tube (16); two tube sheets (15) are installed in the heat exchange shell (3) to divide the heat exchange shell (3) into two liquid collecting chambers (17); a plurality of heat exchange tubes (16) are installed between the two tube sheets (15) so that the two liquid collecting chambers (17) are connected; and a coolant inlet (19) and a coolant outlet (18) are respectively installed at both ends of the heat exchange shell (3).

6. The wiped film evaporator recovery device according to claim 1, characterized in that: The scraped film evaporator (1) comprises an evaporator shell (20), a power device (21) is mounted on the evaporator shell (20), a rotating shaft (22) is mounted on the output end of the power device (21), the rotating shaft (22) extends into the evaporator shell (20), and a scraper assembly is mounted on the rotating shaft (22); A mixed liquid inlet (23) and a low-boiling-point liquid outlet (32) are installed on the upper side of the evaporator shell (20), and a heating component is also installed outside the evaporator shell (20).

7. The wiped film evaporator recovery device according to claim 6, characterized in that: The scraper assembly comprises a connecting rod (24), one end of which is fixedly connected to the rotating shaft (22), and the other end of which is connected to a scraper (25), the outer edge of which abuts against the inner wall of the evaporator shell (20).

8. The wiped film evaporator recovery device according to claim 6, characterized in that: A gas-liquid separator (26) is also installed in the evaporator shell (20).

9. The wiped film evaporator recovery device according to claim 6, characterized in that: The heating assembly comprises a heating shell (27) mounted on the outer wall of the evaporator shell (20), and a steam outlet (29) and a steam inlet (28) are respectively mounted on the upper side and the lower side of the heating shell (27).

10. The wiped film evaporator recovery device according to claim 6, characterized in that: A confluence coil (30) is also installed in the evaporator shell (20), the confluence coil (30) is in communication with the mixed liquid inlet (23), and a plurality of liquid outlet heads (31) are installed on the confluence coil (30), the liquid outlet heads (31) facing the inner wall of the evaporator shell (20).

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