MVR evaporator for landfill leachate treatment

Abstract

This invention relates to the technical field of MVR evaporator processing, specifically providing an MVR evaporator for landfill leachate treatment, comprising: a frame, an evaporator tank, a compressor, and a gas separator. The evaporator tank and the gas separator are respectively fixedly installed on both sides inside the frame. A base is installed at the bottom of the compressor. The lower inner side of the evaporator tank is connected to the interior of the gas separator via a gas flow pipe. The upper inner side of the gas separator is connected to the suction end of the compressor via a first connecting pipe. The discharge end of the compressor is connected to the upper interior of the evaporator tank via a second connecting pipe. A heat exchange tube bundle is fixedly installed inside the evaporator tank at the position corresponding to the second connecting pipe. An anti-foaming mechanism is provided inside the evaporator tank and above the heat exchange tube bundle. This invention can ensure heat exchange efficiency and eliminate foam in the raw liquid.

Description

Technical Field

[0001] This invention relates to the technical field of MVR evaporator manufacturing, and specifically provides an MVR evaporator for landfill leachate treatment. Background Technology

[0002] In industries such as chemical, pharmaceutical, and food processing, MVR evaporators are common evaporation equipment. They improve the thermal efficiency of steam by mechanically compressing secondary steam, thereby achieving energy savings. However, the operating performance of evaporators is affected by various factors, among which the inlet water conditions are crucial. The optimization and control of evaporator inlet water conditions will be discussed below.

[0003] Currently, MVR evaporators are a new type of high-efficiency and energy-saving evaporation equipment widely used in industries such as chemical, pharmaceutical and food. They are mainly used for evaporation, concentration and crystallization in the production process. The equipment uses low temperature and low pressure steam technology and clean energy to generate steam and separate water from the medium. It is an internationally advanced evaporation technology and an upgraded product to replace traditional evaporators. MVR evaporators are generally composed of heat exchangers, circulating pumps, gas separators and compressors.

[0004] When treating landfill leachate, the leachate concentration is high and contains many impurities. If it is not treated, it can easily affect the operation of the heat exchanger. Therefore, treatment agents and descaling agents are usually added to the raw liquid and then enter the evaporator through the pipeline. However, when it flows into the heat exchanger, there will be a lot of liquid bubbles and foam, which will increase the energy consumption of the heat exchanger. Therefore, we need to improve the above problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the background art by proposing an MVR evaporator for landfill leachate treatment.

[0006] To achieve the above objectives, the present invention provides an MVR evaporator for landfill leachate treatment, comprising: a frame, an evaporator tank, a compressor, and a gas separator. The evaporator tank and the gas separator are respectively fixedly installed on both sides inside the frame. A base is installed at the bottom of the compressor. The lower inner side of the evaporator tank is connected to the interior of the gas separator via a gas flow pipe. The upper inner side of the gas separator is connected to the suction end of the compressor via a first connecting pipe. The discharge end of the compressor is connected to the upper interior of the evaporator tank via a second connecting pipe. A heat exchange tube bundle is fixedly installed inside the evaporator tank at the position corresponding to the second connecting pipe. A defoaming mechanism is provided inside the evaporator tank and above the heat exchange tube bundle. A liquid inlet assembly is provided above the inner side of the evaporator tank. A purification mechanism is provided inside the second connecting pipe.

[0007] Preferably, the defoaming mechanism includes an annular seat fixedly installed inside the evaporator tank and above the heat exchange tube bundle. An actuating component is provided inside the annular seat. A foaming funnel is installed inside the evaporator tank and above the annular seat. A flow port is opened at the bottom inside the foaming funnel. A second rotating shaft is rotatably installed inside the flow port. A support rod is fixedly installed above the inside of the evaporator tank. The second rotating shaft passes through the lower inside of the support rod and a filter mechanism is provided on the outer side.

[0008] Preferably, the actuating assembly includes fixed plates that are equidistantly mounted on the inner side of the ring seat along the circumferential direction. A silicone brush is fixedly mounted on the outer side of each of the multiple fixed plates. A spring rope is fixedly mounted below the outer side of each of the multiple silicone brushes. A ring cover is fixedly mounted on the outer side of each of the multiple spring ropes at their close ends.

[0009] Preferably, the filtration mechanism includes a filter cover fixedly installed on the outside of the second rotating shaft, a connecting rod fixedly installed in the middle of the bottom of the filter cover, a plug fixedly installed at the bottom of the connecting rod, the plug being made of rubber material and having a curved outer edge, the plug being movably inserted into the inner side of the ring cover, and multiple silicone brushes slidingly contacting the outer wall of the filter cover.

[0010] Preferably, the liquid inlet assembly includes a raw liquid delivery pipe connected to and installed above the inner side of the evaporator tank, and a flange interface is fixedly installed at the end of the raw liquid delivery pipe away from the evaporator tank.

[0011] Preferably, the impurity removal mechanism includes a sealing cylinder fixedly installed inside the second connecting pipe and near the evaporator tank. A movable rod is slidably inserted inside the sealing cylinder. A rotating rod is rotatably installed inside the lower end of the movable rod. A ring array of baffles is fixedly installed on the outer sides of both ends of the rotating rod. A contact wheel is rotatably installed inside one end of each set of baffles. A fixing block is fixedly installed outside the sealing cylinder and inside the second connecting pipe. A filter screen is slidably installed outside the fixing block. An impurity removal pipe is connected and installed inside the lower part of the second connecting pipe, corresponding to the position of the filter screen. An elastic component is provided inside the impurity removal pipe.

[0012] Preferably, the elastic component includes a fixing rod fixedly installed on the upper inner side of the impurity removal tube, a spring being fitted on the outer side of the fixing rod, one end of the spring contacting the surface of the filter screen, and a sealing cap being threadedly connected to the lower outer side of the impurity removal tube.

[0013] Preferably, a push plate is fixedly installed above one end of the moving rod, and hydraulic cylinders are fixedly installed on the lower surfaces of both ends of the push plate. A ring frame is fixedly installed on the outside of the evaporator tank, and the two hydraulic cylinders are respectively clamped on the inner sides of both ends of the ring frame. An L-shaped frame is fixedly installed on the upper surface of the push plate, and a motor is fixedly installed on the inner side of the L-shaped frame. A first rotating shaft is fixedly connected to the output end of the motor, and the first rotating shaft is connected to a second rotating shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By installing a foaming hopper on the upper inner side of the evaporator tank, the raw liquid can be initially treated. The raw liquid and the accompanying reagents are transported to the foaming hopper through the raw liquid delivery pipe, and then collect and fall into the filter hood through the flow port. The filter hood rotates in conjunction with the first shaft and motor, driven by the second rotating shaft and pulley assembly. When the filter hood rotates, it contacts multiple silicone brushes on the inner side of the ring seat, and then drips from the outside of the filter hood into the heat exchange tube bundle. When the leachate flows into the evaporator tank, it can reduce the area of ​​foam and allow it to pass through the filter pores of the filter hood. As the liquid comes into contact with the silicone brush, most of the impurities and foam in the original liquid can be removed. Driven by the lifting and lowering of the hydraulic cylinder, the L-shaped frame drives the second and first rotating shafts to move downwards when the belt pulley assembly is in operation. This causes the bottom connecting rod of the filter cover to press down, the plug head to squeeze the ring cover, and then rises. Under the elastic pull of multiple elastic ropes and springs, the ring cover separates from the outside of the plug head. The springs tap the liquid on the upper surface of the heat exchange tube bundle, thereby effectively eliminating the foam in the liquid flowing into the heat exchange tube bundle, thus improving the heat exchange efficiency of the heat exchanger.

[0016] By installing a filter screen inside the second connecting pipe, impurities can be removed from the secondary return steam, preventing excessive pressure inside the compressor due to impurities in the gas, which would affect gas evaporation. When the hydraulic cylinder drives the push plate to rise and fall, the corresponding moving rod also reciprocates, driving the rotating rod inside the sealing cylinder to move up and down. The corresponding multiple sets of baffles and contact wheels can then roll and contact the filter screen, reducing the blockage of impurities. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle.

[0019] Figure 3 This is a schematic diagram of a partial connection structure between the evaporator tank and the second connecting pipe of the present invention;

[0020] Figure 4 This is a schematic diagram of a partial connection structure inside the evaporator tank of the present invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the second connecting pipe of the present invention;

[0022] Figure 6 This is a schematic diagram showing the connection between the foaming funnel and the filter cover in this invention;

[0023] Figure 7 This is another schematic diagram of the connection structure between the foaming funnel and the filter cover in this invention;

[0024] Figure 8 This is a schematic diagram of the connection structure between the ring seat and the silicone brush of the present invention;

[0025] Figure 9 This is a schematic diagram of the partial structure between the ring cover and the plug head of the present invention;

[0026] Figure 10 For the present invention Figure 5 Enlarged diagram of point A in the middle.

[0027] In the diagram: 1. Tool frame; 2. Machine base; 3. Evaporator tank; 4. First connecting pipe; 5. Compressor; 6. Raw material delivery pipe; 7. Second connecting pipe; 8. L-shaped frame; 9. Push plate; 10. Hydraulic cylinder; 11. Motor; 12. Sealing cylinder; 13. First rotating shaft; 14. Pulley assembly; 15. Gas separator; 16. Gas flow pipe; 17. Ring frame; 18. Impurity removal pipe; 19. Sealing cover; 2 0. Heat exchanger tube bundle; 21. Support rod; 22. Foaming hopper; 23. Ring seat; 24. Moving rod; 25. Filter cover; 26. Second rotating shaft; 27. Plug; 28. Connecting rod; 29. ​​Spring rope; 30. Silicone brush; 31. Spring piece; 32. Fixing plate; 33. Contact wheel; 34. Fixing block; 35. Rotating rod; 36. Baffle; 37. Fixing rod; 38. Ring cover; 39. Filter screen; 40. Spring. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0030] like Figures 1-10The MVR evaporator shown includes: a frame 1, an evaporator tank 3, a compressor 5, and a gas separator 15. The evaporator tank 3 and the gas separator 15 are fixedly installed on both sides inside the frame 1. A base 2 is installed at the bottom of the compressor 5. The lower inner side of the evaporator tank 3 is connected to the inside of the gas separator 15 through a gas flow pipe 16. The upper inner side of the gas separator 15 is connected to the suction end of the compressor 5 through a first connecting pipe 4. The discharge end of the compressor 5 is connected to the upper inner side of the evaporator tank 3 through a second connecting pipe 7. A heat exchange tube bundle 20 is fixedly installed inside the evaporator tank 3 at the position corresponding to the second connecting pipe 7. A defoaming mechanism is provided inside the evaporator tank 3 and above the heat exchange tube bundle 20. A liquid inlet assembly is provided inside the upper inner side of the evaporator tank 3. A dirt removal mechanism is provided inside the second connecting pipe 7.

[0031] The raw liquid flows through the liquid inlet assembly to the defoaming mechanism, where the foam is defoamed, and then flows into the heat exchange tube bundle 20. The heat exchange tube bundle 20 is connected to an external heater to heat the raw liquid inside the heat exchange tube bundle 20. The concentrated liquid drips from the bottom of the heat exchange tube bundle 20 into the evaporator tank 3 for temporary storage. The gas flows into the gas separator 15 through the gas flow pipe 16. The compressor 5 draws in the steam from the gas separator 15 through the first connecting pipe 4. The compressed and reheated steam from the compressor 5 is then circulated and guided into the evaporator tank 3 to heat the heat exchange tube bundle 20, thereby circulating the treatment of landfill leachate.

[0032] The defoaming mechanism includes an annular seat 23 fixedly installed inside the evaporator tank 3 and above the heat exchange tube bundle 20. An actuating component is provided inside the annular seat 23. A defoaming hopper 22 is installed inside the evaporator tank 3 and above the annular seat 23. A flow port is provided at the bottom of the inner side of the defoaming hopper 22. The raw liquid flowing into the defoaming hopper 22 can be collected inside the filter cover 25 for treatment. A second rotating shaft 26 is rotatably installed inside the flow port. A support rod 21 is fixedly installed above the inner side of the evaporator tank 3. The second rotating shaft 26 passes through the lower part of the support rod 21 and a filtration mechanism is provided on the outer side.

[0033] The actuating assembly includes fixed plates 32 that are equidistantly mounted on the inner side of the ring seat 23 along the circumferential direction. Silicone brushes 30 are fixedly mounted on the outer side of multiple fixed plates 32. Elastic cords 29 are fixedly mounted on the lower outer side of multiple silicone brushes 30. Spring pieces 31 are fixedly mounted on the lower outer side of multiple elastic cords 29. A ring cover 38 is installed on one end of multiple elastic cords 29 that are close to each other.

[0034] The filtration mechanism includes a filter cover 25 fixedly installed on the outside of the second rotating shaft 26. A connecting rod 28 is fixedly installed in the middle of the bottom of the filter cover 25. A plug 27 is fixedly installed at the bottom of the connecting rod 28. The plug 27 is made of rubber material and its outer edge is curved. The plug 27 is movably inserted into the inner side of the ring cover 38. Multiple silicone brushes 30 slide in contact with the outer wall of the filter cover 25.

[0035] The L-shaped frame 8 drives the second rotating shaft 26 and the first rotating shaft 13 to move downward, causing the bottom connecting rod 28 of the filter cover 25 to press down, the plug head 27 to press the ring cover 38, and then rises. Under the elastic pull of multiple elastic ropes 29 and spring plates 31, the ring cover 38 is then separated from the outside of the plug head 27, and the spring plates 31 tap the liquid on the upper surface of the heat exchange tube bundle 20, thereby fully eliminating the liquid foam flowing into the heat exchange tube bundle 20.

[0036] The liquid inlet assembly includes a raw liquid delivery pipe 6 connected to the upper inner side of the evaporator tank 3. A flange interface is fixedly installed at one end of the raw liquid delivery pipe 6 away from the evaporator tank 3. The flange interface at one end of the raw liquid delivery pipe 6 can be connected to a pipeline connected to an external pump, thereby automatically delivering the raw liquid.

[0037] The impurity removal mechanism includes a sealing cylinder 12 fixedly installed inside the second connecting pipe 7 and near the evaporator tank 3. A moving rod 24 is slidably inserted inside the sealing cylinder 12. A rotating rod 35 is rotatably installed inside the lower end of the moving rod 24. A ring array of baffles 36 is fixedly installed on the outer sides of both ends of the rotating rod 35. A contact wheel 33 is rotatably installed inside one end of each set of baffles 36. A fixing block 34 is fixedly installed on the outer side of the sealing cylinder 12 and inside the second connecting pipe 7. A filter screen 39 is slidably installed on the outer side of the fixing block 34. The moving rod 24 drives the rotating rod 35 inside the sealing cylinder 12 to reciprocate up and down. The purpose is to clean the surface of the filter screen 39 inside the second connecting pipe 7. The purpose of the filter screen 39 inside the second connecting pipe 7 is to remove impurities from the secondary return steam, so as to avoid the internal pressure of the compressor 5 being too high due to impurities in the gas, which would affect the evaporation of the gas.

[0038] A cleaning pipe 18 is installed inside the lower part of the second connecting pipe 7, corresponding to the position of the filter screen 39. An elastic component is provided inside the cleaning pipe 18. The elastic component includes a fixed rod 37 fixedly installed on the upper part of the inner side of the cleaning pipe 18. A spring 40 is sleeved on the outer side of the fixed rod 37. One end of the spring 40 is in contact with the surface of the filter screen 39. When the filter screen 39 is contacted by the contact wheel 33, it will squeeze the spring 40 on one side, thereby causing the filter screen 39 to move intermittently, allowing the impurities on the surface to fall off the surface of the filter screen 39. A sealing cap 19 is threadedly connected to the lower outer side of the cleaning pipe 18. The sealing cap 19 can be unscrewed later to remove the impurities inside the cleaning pipe 18.

[0039] A push plate 9 is fixedly installed on one end of the moving rod 24. Hydraulic cylinders 10 are fixedly installed on the lower surfaces of both ends of the push plate 9. A ring frame 17 is fixedly installed on the outside of the evaporator tank 3. The two hydraulic cylinders 10 are respectively clamped on the inner sides of both ends of the ring frame 17. The ring frame 17 is used to support the use of the hydraulic cylinders 10, so that they are more stable when they are lifted and lowered.

[0040] An L-shaped frame 8 is fixedly installed on the upper surface of the push plate 9. A motor 11 is fixedly installed on the inner side of the L-shaped frame 8. The frame of one end of the motor 11 slides against the outer side of the evaporator tank 3. A first rotating shaft 13 is fixedly connected to the output end of the motor 11. The first rotating shaft 13 and the second rotating shaft 26 are connected by a pulley assembly 14. Under the drive of the pulley assembly 14, the first rotating shaft 13 and the second rotating shaft 26 rotate synchronously.

[0041] Working principle: In use, the raw liquid delivery pipe 6 is connected to an external pump to extract leachate. The leachate first falls into the slurry hopper 22, and then flows into the filter cover 25 through the flow port. Driven by the second rotating shaft 26 and the pulley assembly 14, the filter cover 25 rotates when the motor 11 drives the first rotating shaft 13. The leachate seeps through the filter holes inside the filter cover 25 to the outside, and then drips from the outside of the filter cover 25 to the heat exchanger. Inside the tube bundle 20, when the filter cover 25 rotates, it contacts multiple silicone brushes 30 on the inner side of the ring seat 23. This reduces the area of ​​foam when leachate flows into the evaporator tank 3. Furthermore, the liquid passing through the filter holes of the filter cover 25, through contact with the silicone brushes 30, removes most of the impurities and foam from the leachate. Driven by the lifting and lowering of the hydraulic cylinder 10, the push plate 9 drives the L-shaped frame 8 and the moving rod 24 to reciprocate, satisfying the transmission requirements of the pulley assembly 14. When in motion, the L-shaped frame 8 drives the second rotating shaft 26 and the first rotating shaft 13 to move downward, causing the bottom connecting rod 28 of the filter cover 25 to press down, the plug 27 to squeeze the ring cover 38, and then rises. Under the elastic pull of multiple elastic ropes 29 and spring plates 31, the ring cover 38 is then separated from the outside of the plug 27. The spring plates 31 tap the liquid on the upper surface of the heat exchange tube bundle 20, thereby effectively eliminating the liquid foam flowing into the heat exchange tube bundle 20, thereby improving the heat exchange efficiency. Meanwhile, the moving rod 24 drives the rotating rod 35 inside the sealing cylinder 12 to move up and down repeatedly. The purpose is to clean the surface of the filter screen 39 inside the second connecting pipe 7. The purpose of the filter screen 39 inside the second connecting pipe 7 is to remove impurities from the secondary return steam, so as to avoid the internal pressure of the compressor 5 being too high due to impurities in the gas, which would affect the evaporation of the gas. Under the transport of steam, multiple sets of baffles 36 drive the contact wheel 33 to rotate, so that it can roll and contact the filter screen 39 on one side, reducing the blockage of impurities.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

Claims

1. An MVR evaporator for landfill leachate treatment, comprising: The following components are provided: a frame (1), an evaporator tank (3), a compressor (5), and a gas separator (15). The evaporator tank (3) and the gas separator (15) are fixedly installed on both sides inside the frame (1). A base (2) is installed at the bottom of the compressor (5). The lower inner side of the evaporator tank (3) is connected to the interior of the gas separator (15) via a gas flow pipe (16). The upper inner side of the gas separator (15) is connected to the suction end of the compressor (5) via a first connecting pipe (4). The discharge end of the compressor (5) is connected to the upper interior of the evaporator tank (3) via a second connecting pipe (7). A heat exchange tube bundle (20) is fixedly installed inside the evaporator tank (3) at the position corresponding to the second connecting pipe (7). A defoaming mechanism is provided inside the evaporator tank (3) and above the heat exchange tube bundle (20). A liquid inlet assembly is provided above the inner side of the evaporator tank (3). A purification mechanism is provided inside the second connecting pipe (7). The defoaming mechanism includes an annular seat (23) fixedly installed inside the evaporator tank (3) and above the heat exchange tube bundle (20). An actuating component is provided inside the annular seat (23). A foaming bucket (22) is installed inside the evaporator tank (3) and above the annular seat (23). A flow port is opened at the bottom inside the foaming bucket (22). A second rotating shaft (26) is rotatably installed inside the flow port. A support rod (21) is fixedly installed above the inside of the evaporator tank (3). The second rotating shaft (26) passes through the lower part of the support rod (21) and a filter mechanism is provided on the outside. The actuating assembly includes fixed plates (32) that are equidistantly mounted on the inner side of the ring seat (23) along the circumferential direction. Silicone brushes (30) are fixedly mounted on the outer side of each of the fixed plates (32). Elastic cords (29) are fixedly mounted on the lower outer side of each of the silicone brushes (30). Spring pieces (31) are fixedly mounted on the lower outer side of each of the elastic cords (29). A ring cover (38) is installed on one end of each of the elastic cords (29) that is close to each other. The filtration mechanism includes a filter cover (25) fixedly installed on the outside of the second rotating shaft (26). A connecting rod (28) is fixedly installed in the middle of the bottom of the filter cover (25). A plug (27) is fixedly installed at the bottom of the connecting rod (28). The plug (27) is made of rubber material and has a curved outer edge. The plug (27) is movably inserted into the inner side of the ring cover (38). Multiple silicone brushes (30) slide in contact with the outer wall of the filter cover (25).

2. The MVR evaporator for landfill leachate treatment according to claim 1, characterized in that: The impurity removal mechanism includes a sealing cylinder (12) fixedly installed inside the second connecting pipe (7) and near the evaporator tank (3). A moving rod (24) is slidably inserted inside the sealing cylinder (12). A rotating rod (35) is rotatably installed inside the lower end of the moving rod (24). A ring array of baffles (36) is fixedly installed on the outer sides of both ends of the rotating rod (35). A contact wheel (33) is rotatably installed inside one end of each of the multiple sets of baffles (36). A fixing block (34) is fixedly installed outside the sealing cylinder (12) and inside the second connecting pipe (7). A filter screen (39) is slidably installed on the outer side of the fixing block (34). An impurity removal pipe (18) is connected and installed below the second connecting pipe (7) at the position corresponding to the filter screen (39). An elastic component is provided inside the impurity removal pipe (18).

3. An MVR evaporator for landfill leachate treatment according to claim 2, characterized in that: The elastic component includes a fixed rod (37) fixedly installed on the upper inner side of the impurity removal tube (18), a spring (40) is fitted on the outer side of the fixed rod (37), one end of the spring (40) is in contact with the surface of the filter screen (39), and a sealing cap (19) is threadedly connected to the lower outer side of the impurity removal tube (18).

4. An MVR evaporator for landfill leachate treatment according to claim 3, characterized in that: A push plate (9) is fixedly installed above one end of the moving rod (24). Hydraulic cylinders (10) are fixedly installed on the lower surfaces of both ends of the push plate (9). A ring frame (17) is fixedly installed on the outside of the evaporator tank (3). The two hydraulic cylinders (10) are respectively clamped on the inner sides of both ends of the ring frame (17). An L-shaped frame (8) is fixedly installed on the upper surface of the push plate (9). A motor (11) is fixedly installed on the inner side of the L-shaped frame (8). A first rotating shaft (13) is fixedly connected to the output end of the motor (11). The first rotating shaft (13) and the second rotating shaft (26) are connected by a pulley assembly (14).

5. An MVR evaporator for landfill leachate treatment according to claim 4, characterized in that: The liquid inlet assembly includes a raw liquid delivery pipe (6) connected to the upper inner side of the evaporator tank (3), and a flange interface is fixedly installed at the end of the raw liquid delivery pipe (6) away from the evaporator tank (3).

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