An integrated evaporator and method of use

Abstract

The application relates to the technical field of evaporators, in particular to an integrated evaporator and a use method, which comprises a tank body and further comprises a heat exchange assembly arranged in the tank body, a steam filter plate and a slurry-steam separation plate are arranged in the tank body along the axial direction respectively, the steam filter plate is located above the slurry-steam separation plate, the tank body and the upper region of the steam filter plate form a waste gas area, and a slurry-steam separation area is formed between the steam filter plate and the slurry-steam separation plate in the tank body. The tank body is integrated with the upper waste gas area, the middle slurry-steam separation area and the lower crystal slurry area, and the heat exchange assembly which does not directly contact the raw water with steam for falling film heat exchange is arranged in the slurry-steam separation area, the evaporator can treat high-concentration salt-containing wastewater, highly-concentrated crystal slurry products are obtained, the miniaturization and compactness of the overall structure of the evaporation system are realized, and the thermal efficiency of the evaporation system is improved.

Description

Technical Field

[0001] This invention relates to the field of evaporator technology, and in particular to an integrated evaporator and its usage method. Background Technology

[0002] Industrial production processes generate large quantities of saline wastewater that requires effective treatment. Currently, the main methods for treating industrial saline wastewater are membrane processes and evaporation methods. Membrane processes have limitations in treating high-salinity wastewater, making it difficult to achieve ideal treatment results. While multi-effect evaporation systems can treat wastewater, they consume a lot of energy, resulting in insufficient cost control. Mechanical vapor recompression (MVR) systems have become a key technology for solving these problems. Through components such as evaporators, compressors, and pumps, they can concentrate and purify wastewater, converting sewage into clean water and concentrated liquid.

[0003] While mechanical vapor recompression (MVR) technology has been widely applied in industrial wastewater treatment and material concentration, significant technical bottlenecks remain in low-flow-rate scenarios. Current MVR systems are mostly equipped with centrifugal or screw steam compressors to handle conventional throughputs of 0.5 t / h or higher. These systems suffer from the following technical drawbacks: 1) The compressor unit and its associated heat exchanger form a large equipment matrix, with each unit typically occupying an area exceeding 15 m². 2 2) The reliance on external pipelines and valves for connection between functional units not only results in approximately 8-12% pipeline heat loss but also leads to low system integration. This structural characteristic makes it difficult for traditional MVR systems to meet the needs of low-flow scenarios such as machine tool cutting fluid treatment (0.1-0.3 t / h) and cyanide-containing wastewater treatment in electroplating workshops (0.05-0.2 t / h), and they are also unsuitable for space-constrained working environments such as mobile treatment vehicles and ship cabin operations.

[0004] Furthermore, under low-flow conditions, the compressor efficiency of existing systems experiences a precipitous drop (actual data shows that when the throughput is below 0.3 t / h, the compressor's isentropic efficiency decreases by more than 40%), directly causing the system's coefficient of performance (COP) to deteriorate to below 2.0. In addition, the increased equipment maintenance complexity due to the distributed layout (a 35% increase in mean time to repair (MTTR)) and the leakage risks caused by multiple interface connections (statistics show that interface leakage accidents account for 62% of system failures) further restrict the widespread application of MVR technology in the field of fine processing. Therefore, developing new integrated evaporation devices with features such as compact structure, optimized thermal efficiency, and strong adaptability to operating conditions has become a key path to overcome the industry's technological bottlenecks.

[0005] Patent CN102060408A discloses a wastewater evaporation drying process and apparatus system, but its drawbacks include high energy consumption, the need for centrifugal equipment for drying and crystallization, large equipment size, and high risk. Patent CN105000612A discloses a mechanical steam compression system and method for concentrating organic wastewater, but its drawbacks include large equipment size, long heat exchange tubes, and low concentration of the obtained concentrate. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in order to solve the problems of large equipment size, high energy consumption, low structural integration, unsuitability for small flow wastewater treatment and space limitation in the existing MVR system when treating high salinity wastewater, an integrated evaporator and its usage method are provided.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: an integrated evaporator, including a tank body and a heat exchange component disposed within the tank body. A steam filter plate and a slurry-steam separation plate are respectively disposed along the axial direction within the tank body. The steam filter plate is located above the slurry-steam separation plate. The area above the tank body and the steam filter plate forms an exhaust gas zone. A slurry-steam separation zone is formed between the steam filter plate and the slurry-steam separation plate within the tank body. A crystal slurry zone is formed below the tank body and the slurry-steam separation plate. A first through hole is provided on the steam filter plate to connect the exhaust gas zone and the slurry-steam separation zone. A second through hole is provided on the slurry-steam separation plate to connect the slurry-steam separation zone and the crystal slurry zone. An exhaust pipe, a steam inlet pipe, and a crystal slurry outlet pipe are respectively disposed on the tank body. The exhaust pipe is connected to the exhaust gas zone, the steam inlet pipe is connected to the slurry-steam separation zone, and the crystal slurry outlet pipe is connected to the crystal slurry zone. The heat exchange component is located within the slurry-steam separation zone and is used for falling film heat exchange to prevent raw water from directly contacting steam. Compared to existing technologies, this solution integrates an upper waste gas zone, a middle slurry-steam separation zone, and a lower crystal slurry zone within the tank by setting a steam filter plate and a slurry-steam separation plate inside the tank. In addition, a heat exchange component is set in the slurry-steam separation zone to allow the raw water to exchange heat through falling film without direct contact with the steam. The evaporator can treat high-concentration saline wastewater to obtain highly concentrated crystal slurry products. This not only achieves the miniaturization and compactness of the overall structure of the evaporation system, but also improves the thermal efficiency of the evaporation system.

[0008] To realize the heat exchange component, in some preferred embodiments, the heat exchange component includes an inner tube and an outer tube, the diameter of the outer tube is larger than the diameter of the inner tube, the upper end of the outer tube is sealed and the lower end is open, the outer tube is sleeved on the upper end of the inner tube, there is a gap between the upper end of the inner tube and the upper end of the outer tube, the steam inlet pipe is located above the lower open end of the outer tube, and the lower end of the inner tube is used for raw water input.

[0009] To improve heat exchange efficiency, in some preferred embodiments, a plurality of heat exchange fins are provided on the outer peripheral wall of the outer tube. These fins are spaced apart along the axial direction of the outer tube, and the angle formed between the fins and the central axis of the outer tube is either acute or obtuse. Since horizontally arranged heat exchange fins are prone to residual liquid retention and accumulation, and this accumulated residual liquid continuously consumes the heat of the steam, leading to a decrease in heat exchange efficiency, the heat exchange fins are inclined to guide and discharge the accumulated residual liquid, thereby preventing liquid retention and accumulation on the fins and improving heat exchange efficiency.

[0010] In order to improve the treatment efficiency of raw water, in some preferred embodiments, the heat exchange components are provided in a plurality of them, and the lower ends of the inner tubes of the plurality of heat exchange components intersect to form a heat exchange interface tube.

[0011] In some preferred embodiments, the tank body is provided with a raw water inlet pipe for inputting raw water, one end of which passes through the crystal slurry zone and the slurry-vapor separation zone and is connected to the heat exchange interface pipe at the lower end of the inner pipe.

[0012] To better achieve miniaturization and compactness of the evaporator structure, in some preferred embodiments, the raw water inlet pipe is a coil located within the crystal slurry zone. This coil is immersed in the crystal slurry and serves to exchange heat between the raw water within the coil and the crystal slurry within the zone. By configuring the portion of the raw water inlet pipe within the crystal slurry zone as a coil, the contact area with the crystal slurry is increased, improving the heat exchange between the raw water and the crystal slurry, thereby enhancing the subsequent operating efficiency of the evaporator. This does not increase the evaporator's volume, reduces the need for external auxiliary preheating equipment, and further miniaturizes and compacts the evaporation system structure.

[0013] In some preferred embodiments, the tank is provided with an auxiliary heating device, which is used to heat the crystal slurry reserved in the crystal slurry zone.

[0014] In some preferred embodiments, a support plate supporting the tank body is provided at the bottom of the tank body, and the auxiliary heating device is disposed between the support plate and the tank body.

[0015] In some preferred embodiments, the steam inlet pipe is arranged to gradually slope upwards from the outside of the tank body, and an intake fan is installed inside the steam inlet pipe. The upwardly sloping steam inlet pipe can prevent water vapor backflow and facilitate the upward discharge of exhaust gas.

[0016] A method for using an integrated evaporator as described above, comprising the following steps:

[0017] S1. Turn on the auxiliary heating device to raise the temperature of the reserved crystal slurry in the crystal slurry zone to above 80°C, creating conditions for preheating the raw water.

[0018] S2. Open the valve at the steam inlet pipe and supply hot steam into the slurry-steam separation zone. The hot steam heats the heat exchange components in the slurry-steam separation zone. The initial pressure inside the tank is set to 0.3 MPa and the temperature is 120℃.

[0019] S3. When the set stability and pressure are reached in the tank, the raw water is introduced into the heat exchange component;

[0020] S4. Open the valve at the exhaust pipe and discharge the exhaust gas from the exhaust area;

[0021] S5. After the crystal slurry in the crystal slurry zone reaches or exceeds the liquid level of the crystal slurry outlet pipe, open the valve at the bottom of the crystal slurry outlet pipe of the crystal slurry zone to continuously discharge the crystal slurry above the liquid level and obtain concentrated crystal slurry. The crystal slurry below the liquid level in the crystal slurry zone remains in the crystal slurry zone as the medium for the raw water in the preheating coil.

[0022] The beneficial effects of this invention are:

[0023] 1. This device makes full use of the heat of each phase fluid, uses the waste heat of crystal slurry to preheat raw water, reduces overall energy consumption, improves steam utilization rate, enhances energy utilization efficiency, and reduces operating costs.

[0024] 2. This device adopts an integrated design, which makes the structure more compact and effectively reduces the equipment's footprint and space occupation. It is suitable for space-constrained industrial environments, such as machine tool processing workshops, electroplating workshops, and other scenarios requiring the treatment of small-flow wastewater. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0029] Figure 4 for Figure 2 Enlarged view of B in the middle;

[0030] Figure 5 This is an exploded view of the present invention.

[0031] The attached diagram is labeled as follows: 1. Tank body, 2. Exhaust pipe, 3. Steam inlet pipe, 4. Support plate, 5. Steam filter plate, 6. Slurry-steam separation plate, 7. Crystal slurry outlet pipe, 8. Crystal slurry zone, 9. Raw water inlet pipe, 10. Coil, 11. Heat exchange interface pipe, 12. Inner pipe, 13. Outer pipe, 14. Heat exchange fins, 15. Support column, 16. Auxiliary heating device, 17. Inlet fan. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments:

[0033] This invention is not limited to the specific embodiments listed below. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any modifications or alterations made to the design structure and concept of this invention fall within the protection scope of this invention. It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Example 1

[0037] like Figure 1-5As shown, an integrated evaporator includes a tank 1, within which a heat exchange assembly is installed. A steam filter plate 5 and a slurry-vapor separation plate 6 are respectively arranged along the axial direction of the tank 1. The steam filter plate 5 is located above the slurry-vapor separation plate 6. An exhaust gas zone is formed in the area above the tank 1 and the steam filter plate 5. A slurry-vapor separation zone is formed in the area between the steam filter plate 5 and the slurry-vapor separation plate 6 within the tank 1. A crystallization zone 8 is formed in the area below the tank 1 and the slurry-vapor separation plate 6. A first through-hole is provided on the steam filter plate 5 to connect the exhaust gas zone and the slurry-vapor separation zone. The slurry-steam separation plate 6 is provided with a second through hole for connecting the slurry-steam separation zone and the crystal slurry zone 8. The tank body 1 is provided with an exhaust pipe 2, a steam inlet pipe 3 and a crystal slurry outlet pipe 7. The exhaust pipe 2 is connected to the exhaust zone and is located at the top of the tank body 1. The steam inlet pipe 3 is connected to the slurry-steam separation zone and has four pipes evenly distributed along the circumference of the tank body 1. The crystal slurry outlet pipe 7 is connected to the crystal slurry zone 8. The heat exchange component is located in the slurry-steam separation zone and is used to perform falling film heat exchange so that the raw water does not directly contact the steam.

[0038] In this embodiment, the second through hole on the slurry-vapor separation plate 6 is a small round hole with an inverted trapezoidal cross section, so that the heavier concentrate accumulates downward and drips into the crystal slurry zone 8, while the water vapor is heated and turns into steam and evaporates upward. A circular hole is reserved in the center of the slurry-vapor separation plate 6, which is used to connect the bottom of the raw water inlet pipe 9 upward with the heat exchange interface pipe 11.

[0039] The heat exchange assembly includes an inner tube 12 and an outer tube 13. The diameter of the outer tube 13 is larger than that of the inner tube 12. The upper end of the outer tube 13 is sealed and the lower end is open. The outer tube 13 is fitted over the upper end of the inner tube 12. There is a gap between the upper end of the inner tube 12 and the upper end of the outer tube 13. The steam inlet pipe 3 is located above the lower open end of the outer tube 13. The lower end of the inner tube 12 is used for raw water input. That is, in this embodiment, the outer tube 13 is nested outside the inner tube 12. The top of the inner wall of the outer tube 13 and the top of the inner tube 12 are reserved with a gap of about 2cm to ensure normal flow of raw water. The gap between the inner wall of the outer tube 13 and the outer wall of the inner tube 12 is greater than 0.75cm and less than 1.5cm to slow down the falling film flow rate, increase the heating time, and improve the concentration efficiency. At the same time, the top of the outer wall of the outer tube 13 is fixedly connected to the steam filter plate 5 through the support column 15.

[0040] The outer peripheral wall of the outer tube 13 is provided with a number of heat exchange fins 14, which are spaced apart along the axial direction of the outer tube 13. The angle formed between the fins and the central axis of the outer tube 13 is an acute angle or an obtuse angle.

[0041] The specific dimensions of the entire tank 1 and its internal devices can be adjusted according to the requirements of the working environment. Several heat exchange components are provided. In this embodiment, there are six heat exchange components. The six heat exchange components are evenly distributed along the circumference of the tank 1. Of course, in addition to six, there can also be two, three, four or better heat exchange components. The lower ends of the inner tubes 12 of the heat exchange components intersect to form heat exchange interface tubes 11, so as to improve the flexibility and adaptability of the device.

[0042] A raw water inlet pipe 9 is provided outside the tank body 1 for inputting raw water. One end of the raw water inlet pipe 9 passes through the crystal slurry zone 8 and the slurry-vapor separation zone and is connected to the heat exchange interface pipe 11 at the lower end of the inner pipe 12. The raw water inlet pipe 9 is located in the crystal slurry zone 8 as a coil 10. The coil 10 is immersed in the crystal slurry and is used to exchange heat between the raw water in the coil 10 and the crystal slurry in the crystal slurry zone 8.

[0043] An auxiliary heating device 16 is provided on the tank body 1. The auxiliary heating device 16 is used to heat the crystal slurry reserved in the crystal slurry zone 8. A support plate 4 supporting the tank body 1 is provided at the bottom outside the tank body 1. The auxiliary heating device 16 is located between the support plate 4 and the tank body 1 and is in close contact with the tank body 11.

[0044] The steam inlet pipe 3 is installed at an upward angle from the outside to the inside of the tank body 1. An air intake fan 17 is installed inside the steam inlet pipe 3. The angle between the central axis of the steam inlet pipe 3 and the horizontal plane is at least 7.5°.

[0045] The tank 1, raw water inlet pipe 9, coil 10, heat exchange interface pipe 11, outer pipe 13, inner pipe 12 and crystal slurry outlet pipe 7 of this device are made of corrosion-resistant materials, which can treat high-salt wastewater. The slurry-vapor separation plate 6 used effectively improves the concentration ratio of the evaporator, effectively realizing the concentration and resource utilization of high-salt wastewater.

[0046] This device employs corrosion-resistant and scale-resistant materials in key components such as the slurry-steam separation plate 6, coil 10, and heat exchange interface pipe 11. Its reliable design and long service life allow it to adapt to various operating conditions and complex industrial environments. Furthermore, its modular design allows for flexible heat source replacement based on processing capacity requirements, further enhancing the system's adaptability and scalability.

[0047] Example 2

[0048] Example 2 describes a method of using the evaporator described in Example 1. Specifically, it involves a method of using an integrated evaporator as described above, with the following steps:

[0049] S1. Turn on the auxiliary heating device 16 to raise the temperature of the crystal slurry reserved in the crystal slurry zone 8 to above 80°C, creating conditions for preheating the raw water.

[0050] S2. Open the valve at the steam inlet pipe 3 and deliver hot steam into the slurry-steam separation zone. The hot steam heats the heat exchange components in the slurry-steam separation zone. The initial pressure in tank 1 is set to 0.3MPa and the temperature is 120℃. The steam is evenly distributed around the heat exchange components.

[0051] S3. When the set stability and pressure are reached in tank 1, the raw water is input into the heat exchange component;

[0052] S4. Open the valve at exhaust pipe 2 and discharge the exhaust gas in the exhaust gas area, and discharge the waste steam for recycling and compression.

[0053] S5. After the crystal slurry in the crystal slurry zone 8 reaches or exceeds the liquid level of the crystal slurry outlet pipe 7, open the valve at the crystal slurry outlet pipe 7 at the bottom of the crystal slurry zone 8 to continuously discharge the crystal slurry above the liquid level and obtain concentrated crystal slurry. The crystal slurry below the liquid level in the crystal slurry zone 8 remains in the crystal slurry zone 8 as the medium for the raw water in the preheating coil 10.

[0054] In the above-mentioned integrated evaporator and its usage method, during the preheating and evaporation stages, raw water passes through the raw water inlet pipe 9 and the O-shaped coil 10 in the crystal slurry zone 8 within the tank 11, exchanging heat with the high-temperature crystal slurry in the crystal slurry zone 8, raising the temperature of the raw water from 20℃ to 60-70℃. Then, hot steam enters the slurry-steam separation zone through the steam inlet pipe 3, contacting the heat exchange fins 14 of the outer pipe 13. Simultaneously, the preheated raw water enters the heat exchange components. The raw water first enters the inner pipes 12 of each heat exchange component along the heat exchange interface pipe 11. When the raw water rises to the top of the inner pipe 12, it forms a uniform liquid film with the inner wall of the outer pipe 13 and the outer wall of the inner pipe 12 as a carrier for falling film heat exchange, achieving full heat exchange of the raw water and completing the heat exchange process without direct contact with the steam. The heated raw water flows from the lower opening of the outer pipe 13 to the lower slurry-steam separation plate 6, during which the water in the raw water rapidly evaporates. The generated water vapor, or secondary steam, carries the crystal slurry particles upward to the steam filter plate 5. The separated secondary steam flows out through the exhaust port, while the separated crystal slurry particles flow back along the inner wall of the tank 1 to the slurry-steam separation plate 6. The crystal slurry particles enter the separation and concentration stage together with the preliminary concentrate in the separation plate 6. The slurry-steam separation plate 6 allows the heavier concentrate to accumulate downward through the second through hole and drip into the crystal slurry zone 8, resulting in a high-concentration crystal slurry. The water vapor is heated and turns into steam, which evaporates and is discharged upward. The crystal slurry accumulates in the crystal slurry zone 8. When the crystal slurry reaches the set liquid level, i.e., the liquid level where the crystal slurry outlet pipe 7 is located, the crystal slurry above the liquid level is discharged through the crystal slurry outlet pipe 7, resulting in a high concentration ratio. The crystal slurry below the liquid level remains in the crystal slurry zone 8 as the medium for the preheating coil 10. After the secondary steam is separated by the steam filter plate 5, the temperature drops to 40-50℃ and is discharged from the steam exhaust pipe at the top of the tank 1. It can be recycled and compressed or enter the condensation system.

[0055] During system operation, the PLC control system monitors parameters such as temperature, pressure, and liquid level in real time, dynamically adjusting steam flow and auxiliary heaters to ensure stable system operation and energy conservation. Simultaneously, the heat exchange components are cleaned regularly, with a cleaning cycle of ≤144 hours, using backflushing or chemical cleaning methods to prevent scaling and blockage, ensuring heat exchange efficiency.

[0056] In summary, to develop an integrated evaporator with features such as compact structure, optimized thermal efficiency, and strong adaptability to operating conditions, the following design was implemented: a coil 10 located in the crystal slurry zone 8; heat exchange components that prevent direct contact between raw water and hot steam; and a slurry-vapor separation plate 6 for further separation of water vapor and crystal slurry. Corrosion-resistant materials were also used in the tank body 1, raw water inlet pipe 9, coil 10, heat exchange interface pipe 11, inner pipe 12, outer pipe 13, and crystal slurry outlet pipe 7. This enabled the evaporator to treat high-concentration saline wastewater and obtain highly concentrated crystal slurry products, achieving both miniaturization and compactness of the evaporator structure and improving its thermal efficiency.

[0057] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. An integrated evaporator, comprising a tank, characterized in that: It also includes a heat exchange assembly installed inside the tank. A steam filter plate and a slurry-steam separation plate are respectively arranged along the axial direction inside the tank. The steam filter plate is located above the slurry-steam separation plate. The area above the tank and the steam filter plate forms an exhaust gas zone. The area between the steam filter plate and the slurry-steam separation plate inside the tank forms a slurry-steam separation zone. The area below the tank and the slurry-steam separation plate forms a crystallization slurry zone. The steam filter plate has a first through hole for connecting the exhaust gas zone and the slurry-steam separation zone. The slurry-steam separation plate has a second through hole for connecting the slurry-steam separation zone and the crystallization slurry zone. The tank is respectively provided with an exhaust pipe, a steam inlet pipe, and a crystallization slurry outlet pipe. The exhaust pipe is connected to the exhaust gas zone, the steam inlet pipe is connected to the slurry-steam separation zone, and the crystallization slurry outlet pipe is connected to the crystallization slurry zone. The heat exchange assembly is located within the slurry-steam separation zone and is used for falling film heat exchange to prevent the raw water from directly contacting the steam. The heat exchange assembly includes an inner tube and an outer tube. The diameter of the outer tube is larger than that of the inner tube. The upper end of the outer tube is sealed and the lower end is open. The outer tube is sleeved on the upper end of the inner tube. There is a gap between the upper end of the inner tube and the upper end of the outer tube. The steam inlet pipe is located above the lower open end of the outer tube. The lower end of the inner tube is used for raw water input.

2. An integrated evaporator according to claim 1, characterized in that: The outer wall of the outer tube is provided with a plurality of heat exchange fins, which are spaced apart along the axial direction of the outer tube, and the angle formed between the plurality of fins and the central axis of the outer tube is an acute angle or an obtuse angle.

3. An integrated evaporator according to claim 2, characterized in that: The heat exchange components are provided in several parts, and the lower ends of the inner tubes of the several heat exchange components intersect to form a heat exchange interface tube.

4. An integrated evaporator according to claim 3, characterized in that: The tank body is provided with a raw water inlet pipe for inputting raw water. One end of the raw water inlet pipe passes through the crystal slurry zone and the slurry-vapor separation zone and is connected to the heat exchange interface pipe at the lower end of the inner pipe.

5. An integrated evaporator according to claim 4, characterized in that: The raw water inlet pipe is a coil located within the crystal slurry zone. The coil is immersed in the crystal slurry and is used to exchange heat between the raw water in the coil and the crystal slurry in the crystal slurry zone.

6. An integrated evaporator according to claim 5, characterized in that: The tank is equipped with an auxiliary heating device, which is used to heat the crystal slurry reserved in the crystal slurry zone.

7. An integrated evaporator according to claim 6, characterized in that: A support plate is provided at the bottom of the tank body to support the tank body, and the auxiliary heating device is located between the support plate and the tank body.

8. An integrated evaporator according to claim 1, characterized in that: The steam inlet pipe is installed at an upward angle from the outside of the tank to the inside, and an air intake fan is installed inside the steam inlet pipe.

9. A method of using an integrated evaporator as described in claim 6, characterized in that, The operation steps are as follows: S1. Turn on the auxiliary heating device to raise the temperature of the reserved crystal slurry in the crystal slurry zone to above 80°C, creating conditions for preheating the raw water. S2. Open the valve at the steam inlet pipe and supply hot steam into the slurry-steam separation zone. The hot steam heats the heat exchange components in the slurry-steam separation zone. The initial pressure inside the tank is set to 0.3 MPa and the temperature is 120℃. S3. When the set stability and pressure are reached in the tank, the raw water is introduced into the heat exchange component; S4. Open the valve at the exhaust pipe and discharge the exhaust gas from the exhaust area; S5. After the crystal slurry in the crystal slurry zone reaches or exceeds the liquid level of the crystal slurry outlet pipe, open the valve at the bottom of the crystal slurry outlet pipe of the crystal slurry zone to continuously discharge the crystal slurry above the liquid level and obtain concentrated crystal slurry. The crystal slurry below the liquid level in the crystal slurry zone remains in the crystal slurry zone as the medium for the raw water in the preheating coil.

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