A system for preventing caking of a compound fertilizer high tower product

Abstract

The utility model belongs to a kind of system for preventing the caking of compound fertilizer high tower product;Including granulator, granulator feed inlet is connected with compound fertilizer raw material supply unit, granulator discharge port is connected with compound fertilizer processing and packaging unit, and compound fertilizer processing and packaging unit includes cooling and drying part, and the outlet of cooling and drying part is connected with compound fertilizer processing sealing part;Cooling and drying part includes drum cooler, and the upper portion of the discharge port of drum cooler is connected with hot air supply part;Compound fertilizer processing sealing part includes drum screen, finished product film wrapping machine and compound fertilizer packaging machine;Drum screen, finished product film wrapping machine and compound fertilizer packaging machine are all arranged in sealed shell, and drum screen, finished product film wrapping machine and compound fertilizer packaging machine are respectively connected with dry air supply part;It has the characteristics of being able to solve the high moisture content of raw materials and the high moisture content of products during the conveying process in high temperature and high humidity seasons, which can also achieve full utilization of heat energy and improve product quality.

Description

Technical Field

[0001] This utility model belongs to the field of compound fertilizer production technology, specifically a system for preventing the caking of compound fertilizer high-tower products. Background Technology

[0002] Clumping compound fertilizers present several drawbacks in practical use. First, they are difficult to spread evenly, leading to uneven fertilization and negatively impacting crop growth. Second, they not only affect fertilization efficiency and effectiveness but can also pollute the environment in severe cases. Third, compound fertilizers are prone to absorbing moisture, especially during hot and humid seasons, when clumping is particularly severe. It is well known that moisture content is a major factor influencing clumping in compound fertilizers; the higher the moisture content, the more severe the clumping. Currently, compound fertilizers produced by granulators generally lack moisture reduction measures from the cooling process to the final packaging stage. This is especially problematic for highly hygroscopic materials such as urea-based and nitro-based fertilizers, which are prone to sticking and dissolving due to moisture absorption.

[0003] Therefore, how to solve the problem of compound fertilizer caking has become an urgent technical issue for the industry. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a system for preventing the agglomeration of compound fertilizer high-tower products, thereby solving the technical problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A system for preventing agglomeration of compound fertilizer produced in high-tower production includes a granulator for producing compound fertilizer. The granulator's inlet is connected to a compound fertilizer raw material supply unit, and its outlet is connected to a compound fertilizer processing and packaging unit. The compound fertilizer processing and packaging unit includes a cooling and drying section connected to the granulator's outlet, and the outlet of the cooling and drying section is connected to a compound fertilizer processing and sealing section. The cooling and drying section includes a drum cooler, and the upper part of the drum cooler's outlet is connected to a hot air supply unit. The compound fertilizer processing and sealing section includes a drum screen, a finished product coating machine, and a compound fertilizer packaging machine. The drum screen, the finished product coating machine, and the compound fertilizer packaging machine are all housed within a sealed housing and are each connected to a dry air supply unit.

[0007] The beneficial effects of this utility model are as follows: By setting up a cooling and drying section, this utility model allows for the selection of either drying or cooling functions based on environmental conditions and actual production needs. For example, the drying function can be activated in a high-humidity environment to reduce the moisture content of the compound fertilizer product; the cooling function can be activated in a low-humidity environment to cool the product. It should be noted that this utility model does not damage the structure of the original drum cooler, drum screen, finished product coating machine, or compound fertilizer packaging machine. Traditional drum coolers, drum screens, finished product coating machines, and compound fertilizer packaging machines are equipped with dust removal devices to prevent dust pollution. However, the hot air supply and dry air supply components in this utility model are powered by the original dust removal devices, guiding the air from the hot air supply and dry air supply components to flow, thereby reducing the moisture content of the compound fertilizer product. The cooling and drying section in this utility model is mainly used to reduce the moisture content of the compound fertilizer product itself and to prevent moisture from the environment from entering the compound fertilizer product. The main purpose of the compound fertilizer treatment sealing section is to prevent moisture from the environment from entering the compound fertilizer product and causing moisture absorption and clumping.

[0008] Preferably, the feed inlet of the drum cooler is connected to the discharge outlet of the granulator, and the discharge outlet of the drum cooler is connected to the inlet of the drum screen in the compound fertilizer treatment sealing part; the hot air supply component includes a heat exchanger, the first channel inlet of the heat exchanger is connected to the first air pipe, the first channel outlet of the heat exchanger is connected to the discharge outlet of the drum cooler through a hot air blower; the second channel inlet of the heat exchanger is connected to the condensate pipe.

[0009] Preferably, the third channel inlet of the heat exchanger is connected to a 1.3MPa steam pipeline.

[0010] Preferably, the sealed housing is provided with a heat exchange jacket, the inlet of which is connected to the second channel outlet and the third channel outlet of the heat exchanger, respectively, and the outlet of the heat exchange jacket is connected to the circulating water return pipe.

[0011] Preferably, the dry air supply component includes a second air duct, which is connected to an air compressor via a dehumidifier. The outlet of the air compressor is connected to the discharge ports of the drum screen, the finished product wrapping machine, and the compound fertilizer packaging machine, respectively.

[0012] Preferably, a pressure sensor is provided at the outlet of the air compressor.

[0013] Preferably, the compound fertilizer raw material supply unit includes a urea-potassium chloride pipeline, a return pipeline, and a monoammonium phosphate and additive pipeline; the urea-potassium chloride pipeline is connected to the inlet of the primary mixing tank, the outlet of the primary mixing tank is connected to the inlet of the secondary mixing tank through a primary falling film flash evaporator, and the inlet of the secondary mixing tank is also connected to the outlet of the return pipeline; the outlet of the secondary mixing tank is connected to the inlet of the tertiary mixing tank through a secondary falling film flash evaporator, and the inlet of the tertiary mixing tank is also connected to the outlet of the monoammonium phosphate and additive pipeline; the outlet of the tertiary mixing tank is connected to the feed inlet of the granulator in sequence through a tertiary falling film flash evaporator, an emulsifier, and a filter.

[0014] The shell-side inlets of the first-stage falling film flash evaporator, the second-stage falling film flash evaporator, and the third-stage falling film flash evaporator are all connected to a 0.5MPa steam pipeline, and the shell-side outlets of the first-stage falling film flash evaporator, the second-stage falling film flash evaporator, and the third-stage falling film flash evaporator are connected to a condensate pipeline.

[0015] A system for preventing clumping of high-tower compound fertilizer products, manufactured according to the above scheme, utilizes a cooling and drying section to select either drying or cooling functions based on environmental and actual production needs. This reduces the moisture content of the compound fertilizer product itself and prevents environmental moisture from entering the product. A compound fertilizer processing sealing section further prevents moisture absorption and clumping. Since moisture in the compound fertilizer product originates not only from the environment but also from the raw materials, this invention employs a staged method to remove moisture from the raw materials, utilizing a primary falling film flash evaporator, a secondary falling film flash evaporator, and a tertiary falling film flash evaporator. This invention represents an improvement upon existing high-tower compound fertilizer production systems. This invention not only avoids damaging existing equipment but also utilizes existing dust removal equipment in rotary drum coolers, rotary drum screens, finished product wrapping machines, and compound fertilizer packaging machines as power sources. This reduces equipment modification costs and prevents compound fertilizer products from clumping. Furthermore, this invention makes full use of thermal energy to reduce energy consumption. The cooling and drying section can utilize low-grade thermal energy (i.e., it can utilize the low-grade thermal energy of the system itself or low-grade thermal energy from outside the system). After the thermal energy is utilized in the cooling and drying section, it can enter the compound fertilizer processing sealing section to prevent the entry of external humid air. This invention solves the problem of moisture absorption and clumping caused by high moisture content in raw materials and high moisture content in products during transportation in high-temperature and high-humidity seasons. It also achieves full utilization of thermal energy and improves product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the diagram: 1. Urea and potassium chloride pipeline; 2. Return material pipeline; 3. Monoammonium phosphate and additive pipeline; 4. First air pipeline; 5. Second air pipeline; 6. Granulator; 7. Rotary drum cooler; 8. Rotary drum screen; 9. Finished product coating machine; 10. Compound fertilizer packaging machine; 11. Dehumidifier; 12. Hot air blower; 13. Heat exchanger; 14. Primary mixing tank; 15. Secondary mixing tank; 16. Tertiary mixing tank; 17. Primary falling film flash evaporator; 18. Secondary falling film flash evaporator; 19. Tertiary falling film flash evaporator; 20. Filter; 21. Emulsifier; 22. Sealed shell; 23. Heat exchange jacket; 24. Circulating water return pipeline; 25. Air compressor; 26. Pressure sensor; 27. Condensate pipeline; 28. 1.3MPa steam pipeline; 29. ​​0.5MPa steam pipeline. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] The following is in conjunction with the appendix Figure 1To further describe this application in detail, this utility model is a system for preventing the agglomeration of compound fertilizer products produced in high-tower production. The system includes a granulator 6 for producing compound fertilizer. The inlet of the granulator 6 is connected to a compound fertilizer raw material supply unit, and the outlet of the granulator 6 is connected to a compound fertilizer processing and packaging unit. The compound fertilizer processing and packaging unit includes a cooling and drying section connected to the outlet of the granulator 6, and the outlet of the cooling and drying section is connected to a compound fertilizer processing sealing section. The cooling and drying section includes a drum cooler 7, and the upper part of the outlet of the drum cooler 7 is connected to a hot air supply component. The compound fertilizer processing sealing section includes a drum screen 8, a finished product coating machine 9, and a compound fertilizer packaging machine 10. The drum screen 8, the finished product coating machine 9, and the compound fertilizer packaging machine 10 are all housed within a sealing housing 22, and are respectively connected to a dry air supply component. This invention is based on the modification of an existing high-tower compound fertilizer production system to solve the defect of compound fertilizer products being prone to moisture absorption and clumping. It achieves this by setting up a cooling and drying section to reduce the moisture content of the compound fertilizer product while isolating it from environmental moisture. After reducing the moisture content, a compound fertilizer treatment sealing section is used to isolate the product from external air during subsequent screening, coating, and packaging operations, thus preventing environmental moisture from affecting the compound fertilizer product. This invention addresses the clumping defect of compound fertilizer by placing the cooling and drying section and the compound fertilizer treatment sealing section at the rear of the granulator 6's discharge port and coordinating them. Furthermore, in conventional technology, the drum cooler 7, drum screen 8, finished product coating machine 9, and compound fertilizer packaging machine 10 are all equipped with dust collectors to prevent dust pollution. In this invention, the hot air supply component and dry air supply component are powered by corresponding dust collectors to achieve the aforementioned air circulation.

[0021] Furthermore, the feed inlet of the drum cooler 7 is connected to the discharge outlet of the granulator 6, and the discharge outlet of the drum cooler 7 is connected to the inlet of the drum screen 8 in the compound fertilizer treatment sealing part; the hot air supply component includes a heat exchanger 13, the first channel inlet of the heat exchanger 13 is connected to the first air pipe 4, the first channel outlet of the heat exchanger 13 is connected to the discharge outlet of the drum cooler 7 through the hot air blower 12; the second channel inlet of the heat exchanger 13 is connected to the condensate pipe 27. In practical use, the hot air supply component can be turned on or off depending on the production conditions and ambient humidity. For example, in production conditions, when the raw material has a high moisture content, resulting in a high water content in the compound fertilizer product; in terms of ambient humidity, when the humidity exceeds a certain threshold; these are all times when the hot air supply component should be turned on. When the hot air supply component is not turned on, the function of the drum cooler 7 is to cool the compound fertilizer granules from the high-tower granulator 6. When the hot air supply component is turned on, the function of the drum cooler 7 is to dry the compound fertilizer from the high-tower granulator 6, while preventing external humid air from entering the drum cooler 7 and affecting the moisture content of the compound fertilizer granules. The temperature of the condensate in the condensate pipe 27 of this invention is 65-100℃. The source of this condensate can be the condensate in this system, or it can be the condensate in other systems, so as to realize the feature of reusing low-grade heat energy.

[0022] Furthermore, the third channel inlet of the heat exchanger 13 is connected to the 1.3MPa steam pipe 28. When the aforementioned condensate volume is insufficient, or insufficient to make the air reach the preset threshold, the air can be heated by using 1.3MPa steam, or by a combination of condensate and 1.3MPa steam; when the two are combined, it is preferable to use condensate to preheat the air, and then use 1.3MPa steam to heat the preheated air.

[0023] Furthermore, the sealed housing 22 is provided with a heat exchange jacket 23. The inlet of the heat exchange jacket 23 is connected to the second channel outlet and the third channel outlet of the heat exchanger 13, respectively, and the outlet of the heat exchange jacket 23 is connected to the circulating water return pipe 24. As can be seen from the foregoing,

[0024] Furthermore, the dry air supply component includes a second air duct 5, which is connected to an air compressor 25 via a dehumidifier 11. The outlet of the air compressor 25 is connected to the discharge ports of the drum screen 8, the finished product wrapping machine 9, and the compound fertilizer packaging machine 10, respectively. The drum screen 8, the finished product coating machine 9, and the compound fertilizer packaging machine 10 are all housed within the sealed housing 22. Taking the drum screen 8 as an example, it includes, but is not limited to, return conveyor belts, drum screen dust collectors, and other equipment connected to the outside. Therefore, when the sealed housing 22 is used for sealing, gaps connecting to the outside are inevitable. This utility model adopts two measures to solve the above-mentioned technical problems: 1. Pressurize the dehumidified air using the air compressor 25 to create a slightly positive pressure atmosphere in the drum screen 8, the finished product coating machine 9, and the compound fertilizer packaging machine 10, thereby preventing external humid air from entering the relevant equipment; 2. Use the waste heat from the heat exchanger 13 to heat the sealed housing 22, keeping the area around the sealed housing 22 at a higher temperature, accelerating the evaporation of humid air around the sealed housing 22, and preventing it from entering the sealed housing 22.

[0025] Furthermore, a pressure sensor 26 is provided at the outlet of the air compressor 25. By setting the pressure sensor 26, the pressure of the dehumidifying air entering each device can be detected, thereby preventing outside air from entering each device.

[0026] Furthermore, the compound fertilizer raw material supply unit includes a urea-potassium chloride pipeline 1, a return pipeline 2, and a monoammonium phosphate and additive pipeline 3; the urea-potassium chloride pipeline 1 is connected to the inlet of the primary mixing tank 14, the outlet of the primary mixing tank 14 is connected to the inlet of the secondary mixing tank 15 through a primary falling film flash evaporator 17, the inlet of the secondary mixing tank 15 is also connected to the outlet of the return pipeline 2; the outlet of the secondary mixing tank 15 is connected to the inlet of the tertiary mixing tank 16 through a secondary falling film flash evaporator 18, the inlet of the tertiary mixing tank 16 is also connected to the outlet of the monoammonium phosphate and additive pipeline 3, and the outlet of the tertiary mixing tank 16 is connected to the feed inlet of the granulator 6 in sequence through a tertiary falling film flash evaporator 19, an emulsifier 21, and a filter 20. As is well known, the problem of compound fertilizer clumping is closely related to its moisture content. The moisture content of compound fertilizer comes partly from the raw materials and partly from the environment. This utility model can reduce the moisture in the raw materials through the above-mentioned settings, thereby achieving the purpose of reducing the moisture content of the compound fertilizer product. The above-mentioned settings can reduce the workload of the cooling and drying section while ensuring the quality of the compound fertilizer product.

[0027] Furthermore, the shell-side inlets of the first-stage falling film flash evaporator 17, the second-stage falling film flash evaporator 18, and the third-stage falling film flash evaporator 19 are all connected to the 0.5MPa steam pipe 29, and the shell-side outlets of the first-stage falling film flash evaporator 17, the second-stage falling film flash evaporator 18, and the third-stage falling film flash evaporator 19 are connected to the condensate pipe 27. In order to reduce the moisture content in the raw materials, this invention uses the first-stage falling film flash evaporator 17, the second-stage falling film flash evaporator 18, and the third-stage falling film flash evaporator 19 to heat the raw materials. The heat source is the steam in the 0.5MPa steam pipe 29. The condensate produced after heat exchange in the falling film flash evaporators can be used as the heat source for the heat exchanger 13, which has the characteristics of energy saving and consumption reduction.

[0028] The specific working process of this utility model is as follows: The material in the urea and potassium chloride pipeline 1 enters the primary falling film flash evaporator 17 through the primary mixing tank 14 to remove moisture (heat exchange with steam in the primary falling film flash evaporator 17 removes moisture from the raw material), then enters the secondary mixing tank 15 to mix with the material from the return material pipeline 2, and after mixing, enters the secondary falling film flash evaporator 18 to remove moisture from the raw material (heat exchange with steam in the secondary falling film flash evaporator 18 removes moisture from the raw material), and finally enters the tertiary mixing tank 16 to mix with the material from the monoammonium phosphate and additive pipeline 3, and after mixing, enters the tertiary falling film flash evaporator 19 to remove moisture from the raw material (heat exchange with steam in the tertiary falling film flash evaporator 19 removes moisture from the raw material). The compound fertilizer slurry after passing through the three-stage falling film flash evaporator 19 enters the granulator 6 through the emulsifier 21 and filter 20 for granulation. The cooling and drying section can be turned on or off depending on the actual situation. When the hot air supply is not turned on, the function of the drum cooler 7 is to cool the compound fertilizer granules from the high tower granulator 6. When the hot air supply is turned on, the function of the drum cooler 7 is to dry the compound fertilizer from the high tower granulator 6, while preventing the outside humid air from entering the drum cooler 7 and affecting the moisture content of the compound fertilizer granules. Taking the cooling and drying section (or hot air supply) as an example, air enters the first channel inlet of the heat exchanger 13 through the first air pipe 4, and mixes with the condensate from the condensate pipe 27 and / or 1.Steam from the 3MPa steam pipe 28 is used for heat exchange. When the air is heated to a certain temperature, the hot air is used to dry the compound fertilizer granules through the drum cooler 7. The exhaust gas from the drying process is discharged with the dust removal equipment of the drum cooler 7. The dried compound fertilizer granules enter the drum screen 8 for sieving. During the sieving process, the dry air supply unit continuously supplies dry air into the drum screen 8, keeping it under a slightly positive pressure. (The dry air supply unit supplies dry air from the second air pipe 5, which is dehumidified by the dehumidifier 11 and pressurized by the air compressor 25 before being delivered to the drum screen 8, the finished product coating machine 9, and the compound fertilizer packaging machine 10.) The qualified compound fertilizer granules sieved out by the drum screen 8 enter the finished product coating machine 9 for coating. During the coating process, the dry air supply unit continuously supplies dry air into the finished product coating machine 9, keeping it under a slightly positive pressure. After coating, the compound fertilizer granules enter the compound fertilizer packaging machine 10 for packaging. During the packaging process, the dry air supply unit continuously supplies dry air into the finished product coating machine 9. Dry air is supplied to the interior of the compound fertilizer packaging machine 10, maintaining a slightly positive pressure. Dust removal equipment is installed in the aforementioned drum screen 8, finished product wrapping machine 9, and compound fertilizer packaging machine 10, allowing exhaust gas to be discharged. The condensate from the heat exchanger 13 enters the heat exchange jacket 23 of the sealed shell 22, raising the temperature around the sealed shell 22 above the ambient temperature, thereby accelerating the evaporation of moisture from the air surrounding the sealed shell 22 and preventing humid air from entering it. This invention reduces the moisture content of the compound fertilizer by reducing the moisture content of the raw materials (using a multi-stage falling film flash evaporator) and reducing the moisture content of the compound fertilizer granules (using a cooling and drying section). Preventing humid air from contacting the compound fertilizer primarily utilizes the cooling and drying section and the sealing section for compound fertilizer treatment. These methods effectively reduce the moisture content of the compound fertilizer, preventing moisture absorption and clumping, while simultaneously improving the quality of the compound fertilizer through energy conservation and consumption reduction.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A system for preventing agglomeration of compound fertilizer high-tower products, the system comprising a granulator (6) for producing compound fertilizer, the inlet of the granulator (6) being connected to a compound fertilizer raw material supply unit, and the outlet of the granulator (6) being connected to a compound fertilizer processing and packaging unit, characterized in that: The compound fertilizer processing and packaging unit includes a cooling and drying section connected to the discharge port of the granulator (6), and the outlet of the cooling and drying section is connected to the compound fertilizer processing sealing section. The cooling and drying section includes a drum cooler (7), and the upper part of the discharge port of the drum cooler (7) is connected to a hot air supply unit; The compound fertilizer processing sealing unit includes a drum screen (8), a finished product wrapping machine (9), and a compound fertilizer packaging machine (10); the drum screen (8), the finished product wrapping machine (9), and the compound fertilizer packaging machine (10) are all installed inside the sealing housing (22), and the drum screen (8), the finished product wrapping machine (9), and the compound fertilizer packaging machine (10) are respectively connected to a dry air supply unit.

2. The system for preventing caking of compound fertilizer high-tower products according to claim 1, characterized in that: The feed inlet of the drum cooler (7) is connected to the discharge outlet of the granulator (6), and the discharge outlet of the drum cooler (7) is connected to the inlet of the drum screen (8) in the compound fertilizer treatment sealing part. The hot air supply component includes a heat exchanger (13), the first channel inlet of the heat exchanger (13) is connected to the first air pipe (4), and the first channel outlet of the heat exchanger (13) is connected to the discharge port of the drum cooler (7) through the hot air blower (12). The second channel inlet of the heat exchanger (13) is connected to the condensate pipe (27).

3. The system for preventing caking of compound fertilizer high-tower products according to claim 2, characterized in that: The third channel inlet of the heat exchanger (13) is connected to a 1.3MPa steam pipe (28).

4. The system for preventing caking of compound fertilizer high-tower products according to claim 3, characterized in that: The sealed housing (22) is provided with a heat exchange jacket (23). The inlet of the heat exchange jacket (23) is connected to the second channel outlet and the third channel outlet of the heat exchanger (13) respectively. The outlet of the heat exchange jacket (23) is connected to the circulating water return pipe (24).

5. A system for preventing caking of compound fertilizer high-tower products according to claim 1 or 4, characterized in that: The dry air supply unit includes a second air duct (5), which is connected to an air compressor (25) via a dehumidifier (11). The outlet of the air compressor (25) is connected to the discharge ports of the drum screen (8), the finished product wrapping machine (9), and the compound fertilizer packaging machine (10), respectively.

6. A system for preventing caking of compound fertilizer high-tower products according to claim 5, characterized in that: A pressure sensor (26) is provided at the outlet of the air compressor (25).

7. A system for preventing caking of compound fertilizer high-tower products according to claim 2, characterized in that: The compound fertilizer raw material supply unit includes a urea and potassium chloride pipeline (1), a return material pipeline (2), and a monoammonium phosphate and additive pipeline (3); The urea-potassium chloride pipeline (1) is connected to the inlet of the primary mixing tank (14). The outlet of the primary mixing tank (14) is connected to the inlet of the secondary mixing tank (15) through the primary falling film flash evaporator (17). The inlet of the secondary mixing tank (15) is also connected to the outlet of the return pipeline (2). The outlet of the secondary mixing tank (15) is connected to the inlet of the tertiary mixing tank (16) through the secondary falling film flash evaporator (18). The inlet of the tertiary mixing tank (16) is also connected to the outlet of the monoammonium phosphate and additive pipeline (3). The outlet of the tertiary mixing tank (16) is connected to the feed inlet of the granulator (6) in sequence through the tertiary falling film flash evaporator (19), the emulsifier (21), and the filter (20).

8. A system for preventing caking of compound fertilizer high-tower products according to claim 7, characterized in that: The shell-side inlets of the first-stage falling film flash evaporator (17), the second-stage falling film flash evaporator (18), and the third-stage falling film flash evaporator (19) are all connected to a 0.5MPa steam pipe (29), and the shell-side outlets of the first-stage falling film flash evaporator (17), the second-stage falling film flash evaporator (18), and the third-stage falling film flash evaporator (19) are connected to a condensate pipe (27).

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