A multi-effect falling film evaporator

Abstract

This utility model belongs to the field of evaporator technology, specifically a multi-effect falling film evaporator. It includes a first evaporation mechanism, comprising a first evaporation shell, a first heating shell fixedly connected to the lower surface of the first evaporation shell, and a first concentration shell fixedly connected to the lower surface of the first heating shell. A second evaporation mechanism is arranged to the right of the first evaporation mechanism, comprising a second evaporation shell, a second heating shell fixedly connected to the lower surface of the second evaporation shell, and a second concentration shell fixedly connected to the lower surface of the second heating shell. This utility model has a reasonable structure, preheating the medicinal liquid using the waste heat of the condensate generated from the condensation of primary and secondary steam. Simultaneously, stirring improves the preheating effect of the medicinal liquid and reduces heat waste.

Description

Technical Field

[0001] This utility model belongs to the field of evaporator technology, specifically a multi-effect falling film evaporator. Background Technology

[0002] Falling film evaporation involves adding the feed liquid from the upper tube box of the heating chamber of the falling film evaporator. After passing through the liquid distribution and film-forming device, it is evenly distributed into each heat exchange tube. Under the influence of gravity, vacuum induction, and airflow, it forms a uniform film that flows from top to bottom. During the flow, it is heated and vaporized by the shell-side heating medium. The generated vapor and liquid phase enter the separation chamber of the evaporator together. After thorough separation, the vapor enters the condenser for condensation or enters the next effect evaporator as a heating medium, thereby achieving multi-effect operation. The liquid phase is discharged from the separation chamber.

[0003] A search revealed that Chinese patent application number CN201922314278.7 discloses a multi-effect falling film evaporator, comprising a casing, an inlet shell mounted on the upper surface of the casing, an inlet pipe mounted on the upper surface of the inlet shell, a hot liquid outlet pipe on the right surface of the inlet shell, heat exchange tubes installed inside the casing, a lower tube column mounted on the lower surface of the casing, and a hot liquid inlet pipe mounted on the left surface of the lower tube column. This evaporator can granulate the hot liquid medium into a hot liquid film, effectively achieving efficient evaporation of moisture in the feed liquid. It increases the transport time of the feed liquid within the casing, allowing the moisture in the feed liquid to be heated and vaporized by the hot liquid film during flow, resulting in thorough vapor-liquid separation. It effectively and evenly distributes the feed liquid into each heat exchange tube, improving the film-forming effect within the heat exchange tubes. It has the advantages of high heat exchange efficiency and low liquid circulation volume.

[0004] However, the above-mentioned evaporator does not preheat the liquid medicine, resulting in low heat utilization. The heating steam needs to raise the liquid medicine from a low temperature (e.g., 20°C) to the evaporation temperature (e.g., 80°C), which consumes additional sensible heat. In a multi-effect system, the increased first-effect load will also lead to a decrease in steam utilization, resulting in heat waste. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-effect falling film evaporator that uses the waste heat of the condensate generated by the condensation of primary and secondary steam to preheat the liquid medicine, while stirring improves the preheating effect of the liquid medicine and reduces heat waste.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A multi-effect falling film evaporator is provided, comprising a first evaporation mechanism, the first evaporation mechanism including a first evaporation shell, a first heating shell fixedly connected to the lower surface of the first evaporation shell, a first concentration shell fixedly connected to the lower surface of the first heating shell, a second evaporation mechanism disposed on the right side of the first evaporation mechanism, the second evaporation mechanism including a second evaporation shell, a second heating shell fixedly connected to the lower surface of the second evaporation shell, a second concentration shell fixedly connected to the lower surface of the second heating shell, a first flow divider plate fixedly connected inside both the second and first evaporation shells, a heating tube fixedly connected to the lower surface of the first flow divider plate, the number of heating tubes being multiple, a second flow divider plate fixedly connected to the lower surface of the heating tubes, a hot water tank disposed at the front of the first evaporation mechanism, a preheating water tank fixedly connected to the inner surface of the hot water tank, and a connecting arm fixedly connected to the outer surface of the hot water tank. A motor is fixedly connected to the lower surface of the container. A first rotating shaft is fixedly connected to the output end of the motor. A first gear is fixedly connected to the lower surface of the first rotating shaft. A stirring shaft is fixedly connected to the lower surface of the first gear. A stirring blade is fixedly connected to the outer surface of the stirring shaft. There are multiple stirring blades. A connecting block is fixedly connected to the outer surface of the insulated water tank. A pump housing is fixedly connected to the side of the connecting block away from the insulated water tank. An impeller is rotatably installed inside the pump housing. A second rotating shaft is fixedly connected to the upper surface of the impeller. A second gear is fixedly connected to the upper surface of the second rotating shaft. The second gear meshes with the first gear. Water inlet pipes are fixedly connected to the outer surfaces of both the first and second concentration shells. The water inlet pipes are located above the second diverter plate. A connecting pipe is fixedly connected to the outer surface of the water inlet pipe. The connecting pipe is fixedly connected to the water inlet of the pump housing. A water outlet pipe is fixedly connected to the water outlet of the pump housing. The end of the water outlet pipe away from the pump housing is fixedly connected to the outer surface of the insulated water tank.

[0007] Optionally, a feed pipe is fixedly connected to the outer surface of the preheated water tank, a discharge port is fixedly connected to the outer surface of the preheated water tank, a first solenoid valve is fixedly connected to the outer surface of the discharge port, a drain port is fixedly connected to the lower surface of the insulated water tank, and a second solenoid valve is fixedly connected to the outer surface of the drain port.

[0008] Optionally, a first feed inlet is fixedly connected to the upper surface of the first evaporation shell, a steam inlet is fixedly connected to the outer surface of the first heating shell, a primary residual steam outlet is fixedly connected to the outer surface of the first concentration shell, and a first liquid outlet is fixedly connected to the lower surface of the first concentration shell.

[0009] Optionally, a first air outlet is fixedly connected to the outer surface of the first concentration shell, and there are two first air outlets. A first condensation shell is fixedly connected to the end of the first air outlet away from the first concentration shell.

[0010] Optionally, a first steam outlet is fixedly connected to the upper surface of the first condenser shell, the end of the first steam outlet away from the first condenser shell is fixedly connected to the outer surface of the second heating shell, and a first water outlet is fixedly connected to the lower surface of the first condenser shell.

[0011] Optionally, a second feed inlet is fixedly connected to the upper surface of the second evaporation shell, a secondary residual steam outlet is fixedly connected to the outer surface of the second concentration shell, and a second liquid outlet is fixedly connected to the lower surface of the second concentration shell.

[0012] Optionally, a second air outlet is fixedly connected to the outer surface of the second concentration shell, and there are two second air outlets. A second condenser shell is fixedly connected to the end of the second air outlet away from the second concentration shell.

[0013] Optionally, a second steam outlet is fixedly connected to the upper surface of the second condenser shell, and a second water outlet is fixedly connected to the lower surface of the second condenser shell.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This utility model includes a feed pipe, a preheating water tank, a motor, a first rotating shaft, a first gear, a stirring shaft, stirring blades, a first gear, a second gear, a second rotating shaft, an impeller, a first evaporation mechanism, a second diverter plate, a second evaporation mechanism, a water inlet pipe, a connecting pipe, a pump housing, a water outlet pipe, a hot water insulated tank, and a discharge port. In use, the medicine to be concentrated is fed into the preheating water tank through the feed pipe. The motor then operates, driving the first rotating shaft and the first gear to rotate, simultaneously driving the stirring shaft and stirring blades to agitate the medicine in the preheating water tank. The rotation of the first gear drives the second gear to rotate, which in turn drives the second rotating shaft and the impeller to rotate, thereby agitating the medicine in the preheating water tank. Water condensed from the primary steam above the second distribution plate in the first evaporation mechanism and water condensed from the secondary steam above the second distribution plate in the second evaporation mechanism are drawn into a connecting pipe through an inlet pipe, then into the pump housing through the connecting pipe, and finally delivered to the interior of the insulated water tank through an outlet pipe. Although this water is formed by condensation, its temperature is still higher than room temperature. Therefore, the condensate in the insulated water tank can preheat the preheating water tank. The stirring of the agitator blades ensures that the medicine solution in the preheating water tank is heated more evenly. The preheated medicine solution can be discharged through the outlet and finally concentrated in the first or second evaporation mechanism. This invention uses the waste heat of the condensate generated by the primary and secondary steam condensation to preheat the medicine solution, and the stirring improves the preheating effect and reduces heat waste. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model; Figure 3 This is a partial cross-sectional view of the present invention. Figure 4 This utility model Figure 3 Enlarged structural diagram at point A; Figure 5 This utility model Figure 3 Enlarged structural diagram at point B; Figure 6 This is a partial structural schematic diagram of the present invention.

[0017] In the diagram: 1. First evaporation mechanism; 101. First evaporation shell; 102. First heating shell; 103. First concentration shell; 104. First gas outlet; 105. First condensation shell; 106. First steam outlet; 107. Steam inlet; 108. Primary residual steam outlet; 109. First liquid outlet; 110. First water outlet; 111. First feed inlet; 2. Second evaporation mechanism; 201. Second evaporation shell; 202. Second heating shell; 203. Second concentration shell; 204. Second feed inlet; 205. Secondary residual steam outlet; 206. Second liquid outlet; 207. Second gas outlet 208. Second condenser shell; 209. Second steam outlet; 210. Second water outlet; 3. Water inlet pipe; 4. Connecting pipe; 5. Insulated water tank; 6. Preheating water tank; 7. Connecting arm; 8. Motor; 9. First rotating shaft; 10. First gear; 11. Connecting block; 12. Pump housing; 13. Impeller; 14. Second rotating shaft; 15. Second gear; 16. Water outlet pipe; 17. Stirring shaft; 18. Stirring blade; 19. First diverter plate; 20. Heating pipe; 21. Second diverter plate; 22. Discharge port; 23. First solenoid valve; 24. Drain outlet; 25. Second solenoid valve; 26. Feed pipe. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] Reference Figure 1-6The present invention will now be described. A multi-effect falling film evaporator includes a first evaporation mechanism 1, which includes a first evaporation shell 101. A first heating shell 102 is fixedly connected to the lower surface of the first evaporation shell 101, and a first concentration shell 103 is fixedly connected to the lower surface of the first heating shell 102. A second evaporation mechanism 2 is disposed to the right of the first evaporation mechanism 1. The second evaporation mechanism 2 includes a second evaporation shell 201, a second heating shell 202 is fixedly connected to the lower surface of the second evaporation shell 201, and a second concentration shell 203 is fixedly connected to the lower surface of the second heating shell 202. A first flow divider 19 is fixedly connected inside both the second evaporation shell 201 and the first evaporation shell 101. A heating tube 20 is fixedly connected to the lower surface of the first flow divider 19. There are multiple heating pipes 20. A second diverter plate 21 is fixedly connected to the lower surface of the heating pipe 20. A hot water tank 5 is provided on the front side of the first evaporation mechanism 1. A preheating water tank 6 is fixedly connected to the inner surface of the hot water tank 5. A connecting arm 7 is fixedly connected to the outer surface of the hot water tank 5. A motor 8 is fixedly connected to the lower surface of the connecting arm 7. A first rotating shaft 9 is fixedly connected to the output end of the motor 8. A first gear 10 is fixedly connected to the lower surface of the first rotating shaft 9. A stirring shaft 17 is fixedly connected to the lower surface of the first gear 10. Stirring blades 18 are fixedly connected to the outer surface of the stirring shaft 17. There are multiple stirring blades 18. A connecting block 11 is fixedly connected to the outer surface of the hot water tank 5. A pump housing 12 is fixedly connected to the side of the connecting block 11 away from the hot water tank 5. An impeller 13 is internally mounted and rotates. A second shaft 14 is fixedly connected to the upper surface of the impeller 13. A second gear 15 is fixedly connected to the upper surface of the second shaft 14. The second gear 15 meshes with the first gear 10. Inlet pipes 3 are fixedly connected to the outer surfaces of both the first concentration shell 103 and the second concentration shell 203. The inlet pipes 3 are located above the second diverter plate 21. A connecting pipe 4 is fixedly connected to the outer surface of the inlet pipe 3. The connecting pipe 4 is fixedly connected to the inlet of the pump housing 12. An outlet pipe 16 is fixedly connected to the outlet of the pump housing 12. The end of the outlet pipe 16 away from the pump housing 12 is fixedly connected to the outer surface of the insulated water tank 5. After the medicine to be concentrated is transported to the preheating water tank 6 through the feed pipe 26, the motor 8 works, driving the first shaft 9. The rotation of the first gear 10, along with the rotation of the stirring shaft 17 and the stirring blade 18, agitates the liquid in the preheating water tank 6. The rotation of the first gear 10 also drives the second gear 15, which in turn drives the second rotating shaft 14 and the impeller 13. This allows water condensed from the primary steam above the second distribution plate 21 in the first evaporation mechanism 1 and from the secondary steam above the second distribution plate 21 in the second evaporation mechanism 2 to be drawn through the inlet pipe 3 into the connecting pipe 4, then through the connecting pipe 4 into the pump housing 12, and finally through the outlet pipe 16 into the insulated water tank 5. Although this water is formed by condensation, its temperature is still higher than room temperature; therefore, the condensate in the insulated water tank 5 can preheat the preheating water tank 6.The stirring of the stirring blade 18 ensures more even heating of the medicinal liquid in the preheating water tank 6. The preheated medicinal liquid can be discharged through the outlet 22 and ultimately concentrated in the first evaporation mechanism 1 or the second evaporation mechanism 2. A feed pipe 26 and an outlet 22 are fixedly connected to the outer surface of the preheating water tank 6. A first solenoid valve 23 is fixedly connected to the outer surface of the outlet 22. A drain outlet 24 is fixedly connected to the lower surface of the insulated water tank 5, and a second solenoid valve 25 is fixedly connected to the outer surface of the drain outlet 24. The first solenoid valve 23 controls the opening and closing of the outlet 22. The feed pipe 26 adds the medicinal liquid to be concentrated into the preheating water tank 6, the outlet 22 discharges the preheated medicinal liquid, the first solenoid valve 23 controls the opening and closing of the outlet 22, the drain outlet 24 discharges water from the insulated water tank 5, and the second solenoid valve 25 controls the opening and closing of the drain outlet 24.

[0023] The multi-effect falling film evaporator provided by this utility model, compared with the prior art, uses the waste heat of the condensate generated by the condensation of primary and secondary steam to preheat the medicine liquid, and at the same time, the preheating effect of the medicine liquid is improved by stirring, reducing heat waste.

[0024] Please refer to another embodiment of this utility model as well. Figures 1 to 6The upper surface of the first evaporation shell 101 is fixedly connected to a first feed inlet 111; the outer surface of the first heating shell 102 is fixedly connected to a steam inlet 107; the outer surface of the first concentration shell 103 is fixedly connected to a primary residual steam outlet 108; and the lower surface of the first concentration shell 103 is fixedly connected to a first liquid outlet 109. The concentrated medicinal liquid is added to the first evaporation shell 101 through the first feed inlet 111. The steam inlet 107 is used to introduce hot steam. The primary residual steam outlet 108 is connected to an external pipe to discharge uncondensed steam. The first liquid outlet 109 is used to discharge the concentrated medicinal liquid. The outer surface of the first concentration shell 103 is fixedly connected to two first air outlets 104. The first air outlets 104 are located far from... A first condenser shell 105 is fixedly connected to one end of the first concentration shell 103. Part of the water in the medicinal liquid is heated by steam and vaporized into secondary steam. The secondary steam is discharged into the first condenser shell 105 through the first outlet 104. A first steam outlet 106 is fixedly connected to the upper surface of the first condenser shell 105. The end of the first steam outlet 106 away from the first condenser shell 105 is fixedly connected to the outer surface of the second heating shell 202. A first water outlet 110 is fixedly connected to the lower surface of the first condenser shell 105. Part of the secondary steam condenses into liquid water in the first condenser shell 105, while the other part is transported to the second heating shell 202 through the first steam outlet 106, providing heating for the medicinal liquid inside the heating tube 20 in the second heating shell 202. A second feed inlet 204 is fixedly connected to the upper surface of the outer shell 201. A secondary residual steam outlet 205 is fixedly connected to the outer surface of the second concentration shell 203. A second liquid outlet 206 is fixedly connected to the lower surface of the second concentration shell 203. Two second air outlets 207 are fixedly connected to the outer surface of the second concentration shell 203. A second condenser shell 208 is fixedly connected to the end of the second air outlet 207 away from the second concentration shell 203. A second steam outlet 209 is fixedly connected to the upper surface of the second condenser shell 208. A second water outlet 210 is fixedly connected to the lower surface of the second condenser shell 208. The second water outlet 210 can discharge the water accumulated in the second condenser shell 208. The concentrated liquid enters from the first feed inlet 111. The liquid is added to the first evaporation shell 101 and diverted to the heating tube 20 through the first diverter plate 19, falling down the heating tube 20. During this process, hot water vapor, called primary steam, is introduced into the first heating shell 102 through the steam inlet 107 to heat the heating tube 20. Part of the heated primary steam condenses into liquid water and accumulates above the second diverter plate 21, while the other part is discharged as steam from the primary residual steam outlet 108. At the same time, the heated medicinal liquid falls down the heating tube 20 to the bottom of the first concentration shell 103. Some of the water in the medicinal liquid is heated and vaporized into water vapor, called secondary steam. The water content in the medicinal liquid decreases, the concentration of the medicinal liquid increases, and the medicinal liquid is concentrated. The secondary steam enters the first condensation shell 105 through the first outlet 104.Part of the secondary steam is liquefied into water and accumulates at the bottom of the first condenser shell 105. More secondary steam is transported to the second heating shell 202 through the first steam outlet 106 to heat the medicinal liquid in the heated tubes 20 within the second heating shell 202, thus concentrating the medicinal liquid in the second evaporation mechanism 2. After heating the heated tubes 20 in the second heating shell 202, part of the secondary steam liquefies into water and accumulates above the second diverter plate 21 in the second concentration shell 203. Another portion of the secondary steam is discharged through the secondary residual steam outlet 205. Similarly, some water in the medicinal liquid in the second evaporation mechanism 2 is evaporated into steam, becoming tertiary steam. The heat of the tertiary steam is usually insufficient for subsequent heating, so it enters the second condenser shell 208 through the second outlet 207. Part of the tertiary steam condenses into water and accumulates at the bottom of the second condenser shell 208, while the remaining tertiary steam is discharged through the second steam outlet 209.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-effect falling film evaporator, comprising a first evaporation mechanism (1), characterized in that: The first evaporation mechanism (1) includes a first evaporation shell (101), a first heating shell (102) is fixedly connected to the lower surface of the first evaporation shell (101), and a first concentration shell (103) is fixedly connected to the lower surface of the first heating shell (102). A second evaporation mechanism (2) is provided on the right side of the first evaporation mechanism (1). The second evaporation mechanism (2) includes a second evaporation shell (201), a second heating shell (202) is fixedly connected to the lower surface of the second evaporation shell (201), and a second concentration shell (203) is fixedly connected to the lower surface of the second heating shell (202). A first diversion plate (19) is fixedly connected to the interior of both the first evaporation shell (101) and the first diversion plate (19). A heating pipe (20) is fixedly connected to the lower surface of the first diversion plate (19). There are multiple heating pipes (20). A second diversion plate (21) is fixedly connected to the lower surface of the heating pipe (20). A hot water tank (5) is provided on the front side of the first evaporation mechanism (1). A preheating water tank (6) is fixedly connected to the inner surface of the hot water tank (5). A connecting arm (7) is fixedly connected to the outer surface of the hot water tank (5). A motor (8) is fixedly connected to the lower surface of the connecting arm (7). A second diversion plate (21) is fixedly connected to the output end of the motor (8). A rotating shaft (9) is fixedly connected to a first gear (10) on its lower surface. A stirring shaft (17) is fixedly connected to the lower surface of the first gear (10). A stirring blade (18) is fixedly connected to the outer surface of the stirring shaft (17). There are multiple stirring blades (18). A connecting block (11) is fixedly connected to the outer surface of the insulated water tank (5). A pump housing (12) is fixedly connected to the side of the connecting block (11) away from the insulated water tank (5). An impeller (13) is rotatably installed inside the pump housing (12). A second rotating shaft (14) is fixedly connected to the upper surface of the impeller (13). The upper surface of 14) is fixedly connected to a second gear (15), which meshes with the first gear (10). The outer surfaces of the first concentration shell (103) and the second concentration shell (203) are both fixedly connected to water inlet pipes (3). The water inlet pipes (3) are located above the second diversion plate (21). The outer surface of the water inlet pipes (3) is fixedly connected to a connecting pipe (4). The connecting pipes (4) are fixedly connected to the water inlet of the pump housing (12). The water outlet of the pump housing (12) is fixedly connected to a water outlet pipe (16). The end of the water outlet pipe (16) away from the pump housing (12) is fixedly connected to the outer surface of the insulated water tank (5).

2. The multi-effect falling film evaporator as described in claim 1, characterized in that: The preheating water tank (6) is fixedly connected to the outer surface of the feed pipe (26), the preheating water tank (6) is fixedly connected to the outer surface of the discharge port (22), the discharge port (22) is fixedly connected to the outer surface of the first solenoid valve (23), the insulated water tank (5) is fixedly connected to the lower surface of the drain port (24), and the drain port (24) is fixedly connected to the outer surface of the second solenoid valve (25).

3. The multi-effect falling film evaporator as described in claim 1, characterized in that: The upper surface of the first evaporation shell (101) is fixedly connected to a first feed inlet (111), the outer surface of the first heating shell (102) is fixedly connected to a steam inlet (107), the outer surface of the first concentration shell (103) is fixedly connected to a primary residual steam outlet (108), and the lower surface of the first concentration shell (103) is fixedly connected to a first liquid outlet (109).

4. The multi-effect falling film evaporator as described in claim 3, characterized in that: The outer surface of the first concentration shell (103) is fixedly connected to a first air outlet (104), and there are two first air outlets (104). The end of the first air outlet (104) away from the first concentration shell (103) is fixedly connected to a first condenser shell (105).

5. The multi-effect falling film evaporator as described in claim 4, characterized in that: The upper surface of the first condenser shell (105) is fixedly connected to a first steam outlet (106), and the end of the first steam outlet (106) away from the first condenser shell (105) is fixedly connected to the outer surface of the second heating shell (202). The lower surface of the first condenser shell (105) is fixedly connected to a first water outlet (110).

6. The multi-effect falling film evaporator as described in claim 1, characterized in that: The upper surface of the second evaporation shell (201) is fixedly connected to a second feed inlet (204), the outer surface of the second concentration shell (203) is fixedly connected to a secondary residual steam outlet (205), and the lower surface of the second concentration shell (203) is fixedly connected to a second liquid outlet (206).

7. The multi-effect falling film evaporator as described in claim 6, characterized in that: The outer surface of the second concentration shell (203) is fixedly connected to a second air outlet (207). There are two second air outlets (207). The end of the second air outlet (207) away from the second concentration shell (203) is fixedly connected to a second condenser shell (208).

8. The multi-effect falling film evaporator as described in claim 7, characterized in that: The upper surface of the second condenser shell (208) is fixedly connected to a second steam outlet (209), and the lower surface of the second condenser shell (208) is fixedly connected to a second water outlet (210).

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