Skid-mounted evaporation system and operation method

Abstract

The invention relates to the technical field of evaporation systems, in particular to a skid-mounted evaporation system and an operation method.The skid-mounted evaporation system comprises a feed preheating unit which comprises a cooling water tank and a preheater, the cooling water tank is connected with a feed pipeline and provided with a heat exchange coil, and the preheater is connected with the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensate water waste heat preheater; the evaporation separation unit comprises an evaporation separator connected with the discharge waste heat preheater and the condensate water waste heat preheater at the same time, a water vapor compressor connected with the evaporation separator, and a condensate water tank connected with the water vapor compressor; wherein the condensate water tank is connected with the condensate water waste heat preheater through the condensate water pump; and the cooling unit comprises a pipeline arranged between the cooling water tank and the water vapor compressor, and a cooling water pump arranged on the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation systems, and in particular to a skid-mounted evaporation system and an operating method thereof. Background Art

[0002] One type of skid-mounted evaporation system uses mechanical vapor recompression technology, which is an energy-saving technology that utilizes the energy of secondary steam generated by the system itself to reduce the demand for external energy. Its principle is to pass low-grade steam through a compressor to increase its temperature and pressure, thereby increasing its enthalpy value, and then enter the heat exchanger to exchange heat with the raw material liquid. Using the latent heat of steam, the heated raw material liquid evaporates to produce low-grade steam, which then enters the compressor for compression to become high-grade steam, thus achieving continuous evaporation and concentration, thereby achieving energy saving of the system. The technology has been successfully used in the fields of chemical industry, food, papermaking, medicine, seawater desalination and sewage treatment.

[0003] For example, the announcement number CN217511188U discloses a skid-mounted low-temperature MVR evaporation device, in which the leachate first enters the feed assembly, and the feed assembly transports the internal leachate to the preheater. At the same time, the condenser transports condensed water to the preheater, and the preheater heats up the leachate and condensed water. After that, it enters the evaporator for flash evaporation. The leachate after flash evaporation flows to the separator. There is a pressure difference between the separator and the evaporator. Due to the existing pressure difference, vaporization occurs instantly until the feed liquid temperature drops to the feed temperature. The flashed leachate in the separator is sent back to the evaporator through the first circulation pump, heated again, and then enters the separation for flash separation to continuously improve the separation efficiency. When the leachate reaches the designed evaporation concentration, the leachate is discharged from the first pipeline.

[0004] For the skid-mounted low-temperature MVR evaporation device in the above-mentioned public technology, the efficiency of flash separation is improved by the above-mentioned structure, but it has the following problems: Firstly, the leachate discharged from the first pipeline when reaching the designed evaporation concentration is still in a high temperature state. Direct discharge of the leachate in this high temperature state, on the one hand, places high requirements on the discharge and collection end, and on the other hand, wastes its own waste heat.

[0005] Secondly, for the preheaters used, including condensate preheating components and non-condensable gas preheating components, although the leachate can be preheated, the preheating temperature is uncontrollable. In this case, the leachate directly enters the evaporator and separator for circulation. During this process, due to the existing pressure difference, vaporization occurs instantly until the feed liquid temperature drops to the feed temperature. Therefore, the existence of pressure difference will increase the number of cycles of the leachate between the evaporator and the separator, thereby reducing the evaporation efficiency.

[0006] In summary, in view of the problems existing in the actual use of the existing skid-mounted evaporation system, its overall structure needs to be further optimized. Summary of the invention

[0007] The first object of the present invention is to provide a skid-mounted evaporation system to solve the technical problem of optimizing the overall use effect thereof.

[0008] The second object of the present invention is to provide a skid-mounted evaporation system operation method to solve the technical problem of optimizing the overall use effect thereof.

[0009] The skid-mounted evaporation system of the present invention is implemented as follows: A skid-mounted evaporation system, comprising: A feed preheating unit, comprising a cooling water tank with a heat exchange coil connected to the feed pipeline, and a preheater connected to the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensed water waste heat preheater; An evaporation separation unit, comprising an evaporation separator connected to both a discharge waste heat preheater and a condensate waste heat preheater, a water vapor compressor connected to the evaporation separator, and a condensate tank connected to the water vapor compressor; wherein the condensate tank is connected to the condensate waste heat preheater via a condensate pump; The cooling unit comprises a pipeline arranged between a cooling water tank and a water vapor compressor, and a cooling water pump arranged on the pipeline.

[0010] In an optional implementation of the present invention, the evaporative separator adopts an integrated evaporative separation structure having both a separation zone and an evaporative zone.

[0011] In an optional implementation of the present invention, the evaporation separator is also connected to an overflow tank; The overflow tank is provided with a third liquid level gauge.

[0012] In an optional implementation of the present invention, the evaporation separator comprises a separator and an evaporator connected by a connecting pipe; wherein The connecting pipe comprises a first connecting pipe and a second connecting pipe which are independent of each other; the first connecting pipe is provided with a first circulating pump; The discharge waste heat preheater and the condensed water waste heat preheater are respectively connected to the separator.

[0013] In an optional implementation of the present invention, the evaporator is also connected to a condensed water tank.

[0014] In an optional implementation of the present invention, the separator is equipped with a first liquid level meter and a first temperature sensor.

[0015] In an optional implementation of the present invention, the separator is further provided with a heater for preheating the feed liquid in the separator; The heater is arranged at the bottom of the separator or on a pipeline between the separator and the first circulation pump.

[0016] In an optional implementation of the present invention, a discharge pipe is further arranged between the discharge waste heat preheater and the separator, and a discharge pump is arranged on the discharge pipe; and The discharge pipe is also provided with a discharge flow meter.

[0017] In an optional implementation of the present invention, a water spray pipe is further provided between the condensed water tank and the water vapor compressor, and the water spray pipe is provided with a water spray pump suitable for pumping the condensed water in the condensed water tank into the water vapor compressor.

[0018] The skid-mounted evaporation system operation method of the present invention is achieved as follows: A skid-mounted evaporation system operation method, using the skid-mounted evaporation system, comprising: Preheating process: The feed liquid enters the coil of the cooling water tank from the feed pipeline for heat exchange to form two paths of feed liquid. One path of feed liquid enters the discharge waste heat preheater for heat exchange, and the other path of feed liquid enters the condensed water waste heat preheater for heat exchange; Evaporation separation process: The preheated liquid enters the evaporation separator. The secondary water vapor generated by flash evaporation or separation from the liquid phase rises and enters the water vapor compressor. After being heated by the water vapor compressor, it enters the evaporation separator to heat the evaporation circulating liquid. After the secondary water vapor is condensed, it enters the condensate tank and is discharged to the condensate waste heat preheater according to the set liquid level. The condensate is discharged after heat exchange or the condensate is controlled to replenish water to the cooling water tank according to the set liquid level. The concentrated liquid in the separator is continuously pumped to the discharge waste heat preheater according to the set discharge flow rate and then discharged. Cooling process: The water in the cooling water tank is pumped into the water chamber of the steam compressor by the cooling water pump for heat exchange and then returns to the cooling water tank.

[0019] By adopting the above technical scheme, the present invention has the following beneficial effects: the skid-mounted evaporation system and operation method of the present invention can reuse the waste heat of the discharged liquid through the designed discharge waste heat preheater, and can also adjust the discharge temperature, thereby reducing the requirements for the discharge collection end, so that the skid-mounted evaporation system can accept changes in the crystallization temperature of the liquid within a certain range.

[0020] In addition, the separator is also equipped with a heater for preheating the liquid in the separator, which facilitates heating of the liquid in the separator, thereby reducing the number of circulations of the liquid between separators and improving the overall liquid evaporation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The skid-mounted evaporation system of the present invention is a schematic structural diagram of an evaporator and a separator connected to each other; Figure 2 It is a schematic structural diagram of the skid-mounted evaporation system of the present invention, which adopts an integrated evaporation separation structure.

[0022] In the figure: separator 1, first circulating pump 2, water vapor compressor 3, evaporator 4, discharge pump 5, condensate tank 6, discharge waste heat preheater 7, condensate pump 8, spray pump 9, condensate waste heat preheater 10, cooling water tank 11, cooling water pump 12, integrated evaporation separation structure 13, overflow tank 14, heater 15, second circulating pump 16, regulating valve V1, fourth liquid level gauge L4, second temperature sensor T2, third liquid level gauge L3, first liquid level gauge L1, first temperature sensor T1, second liquid level gauge L2, discharge flow meter F1. DETAILED DESCRIPTION

[0023] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0024] Embodiment 1: See also Figure 1 and Figure 2 As shown, this embodiment provides a skid-mounted evaporation system, including: a feed preheating unit, an evaporation separation unit, and a cooling unit.

[0025] Specifically, the first is a feed preheating unit, which includes a cooling water tank 11 with a heat exchange coil connected to the feed pipeline, and a preheater connected to the cooling water tank 11; the preheater includes a discharge waste heat preheater 7 and a condensed water waste heat preheater 10. The cooling water tank 11 is equipped with a fourth liquid level meter L4 and a second temperature sensor T2.

[0026] The designed discharge waste heat preheater 7 can reuse the waste heat of the discharged liquid and adjust the discharge temperature, thereby reducing the requirements for the discharge collection end, so that the skid-mounted evaporation system can accept changes in the crystallization temperature of the liquid within a certain range.

[0027] A regulating valve V1 is also provided between the feed pipeline and the cooling water tank 11 to adjust the feed amount entering the cooling water tank 11. The feed liquid first passes through the heat exchange coil of the cooling water tank 11 to reduce the temperature of the cooling water in the cooling water tank 11, reduce the discharge of cooling water and preheat the feed liquid itself.

[0028] Next is the evaporation separation unit, which includes an evaporation separator connected to both the discharge waste heat preheater 7 and the condensate waste heat preheater 10, a water vapor compressor 3 connected to the evaporation separator, and a condensate tank 6 connected to the water vapor compressor 3; wherein the condensate tank 6 is connected to the condensate waste heat preheater 10 via a condensate pump 8, and the condensate in the condensate tank flows into the condensate waste heat preheater 10 through the condensate pump as a heat source to perform secondary preheating on the feed liquid in the condensate waste heat preheater 10, and the condensate after heat exchange is discharged from the system to realize the recycling of heat. The condensate tank 6 here is equipped with a second liquid level gauge L2.

[0029] In an optional implementation manner, a shock absorber may be further provided under the base of the water vapor compressor 3, and a silencer cover may be installed around the water vapor compressor 3, and the silencer cover may be provided with a cooling fan.

[0030] The water vapor compressor 3 can be started by variable frequency or soft start. After the temperature of the condensed water in the condensed water tank 6 is lowered after the waste heat is used, the condensed water can be added to the cooling water tank 11 according to the liquid level control of the cooling water tank 11, thereby reducing the use of water resources outside the skid-mounted evaporation system.

[0031] Based on the above situation, in the first optional implementation, the evaporation separator adopts an integrated evaporation separation structure 13 having both a separation zone and an evaporation zone. In this regard, the evaporation separator is also connected to an overflow tank 14 through a second circulation pump 16; the overflow tank 14 is equipped with a third liquid level gauge L3. Here, according to the liquid level of the feed liquid in the overflow tank 14 detected by the third liquid level gauge L3, the frequency of the second circulation pump 16 is controlled according to the set liquid level.

[0032] In the second optional implementation mode, this embodiment is described in detail in conjunction with the accompanying drawings. The evaporation separator includes a separator 1 and an evaporator 4 connected by a connecting pipe; the evaporator 4 is, for example, but not limited to a plate evaporator 4. The connecting pipes here include a first connecting pipe and a second connecting pipe that are independent of each other; the first connecting pipe is provided with a first circulating pump 2; the discharge waste heat preheater 7 and the condensate waste heat preheater 10 are respectively connected to the separator 1. The separator 1 is equipped with a first liquid level gauge L1 and a first temperature sensor T1. The evaporator 4 is also connected to the condensate tank 6. Optionally, a balance pipe is also provided between the evaporator 4 and the condensate to facilitate the outflow of the condensate.

[0033] Based on the above structure, a discharge pipe is further arranged between the discharge waste heat preheater 7 and the separator 1, and a discharge pump 5 is arranged on the discharge pipe; and a discharge flow meter F1 is also arranged on the discharge pipe. The designed discharge waste heat preheater 7 can reuse the waste heat of the discharged liquid, and can adjust the discharge temperature, reducing the requirements for the discharge collection end, so that the skid-mounted evaporation system can accept changes in the crystallization temperature of the liquid within a certain range.

[0034] In addition, in an optional implementation, the separator 1 is also configured with a heater 15 for preheating the liquid in the separator 1; it should be noted that the heater 15 here is arranged at the bottom of the separator 1 or on the pipeline between the separator 1 and the first circulation pump 2.

[0035] On the basis of the above structure, it is also necessary to explain that a water spray pipe is also provided between the condensed water tank 6 and the water vapor compressor 3 , and the water spray pipe is provided with a water spray pump 9 suitable for pumping the condensed water 8 in the condensed water tank 6 into the water vapor compressor 3 .

[0036] Finally, there is a cooling unit, which includes a pipeline arranged between the cooling water tank 11 and the water vapor compressor 3, and a cooling water pump 12 arranged on the pipeline.

[0037] In addition, it should be noted that the skid-mounted evaporation system of the present embodiment is fixed as a whole on a frame, which at least includes a door panel and a sealing plate located on the outer layer and a frame bar located on the inner layer. In order to reduce the noise of the overall system operation, a shock-absorbing rubber pad is laid at the bottom of the frame, reinforcing ribs are welded on the inner surfaces of the door panel and the sealing plate, a tightening pad is arranged between the door panel and the frame, and sound-absorbing material is laid inside the door panel and the sealing plate.

[0038] It can be understood that the skid-mounted evaporation system of this embodiment also includes a controller connected to the first liquid level meter L1, the third liquid level meter L3, the third liquid level meter L4, the fourth liquid level meter L4, the first temperature sensor T1, the second temperature sensor T2, the regulating valve V1, the discharge flow meter and the heater 15. Specifically, the controller here can optionally adopt mature means in the prior art to realize the control of the use status of multiple components. This embodiment does not make any improvements to its control principle and method, and mature means can be adopted. This embodiment does not make any absolute restrictions on this. Generally speaking, the controller here can use PID control technology and PLC control to monitor and intelligently control the parameters of each component in the operation of the device in real time, so that the control of the skid-mounted evaporation system is more flexible, and the working processes between the components cooperate with each other, thereby improving the reliability of the operation of the skid-mounted evaporation system.

[0039] Based on the above structure, after gas-liquid separation, the feed liquid is discharged by the discharge pump 5 and enters the discharge preheater for heat exchange and then discharged, and the steam enters the water vapor compressor 3. The water vapor compressor 3 heats and pressurizes the steam and then discharges it into the evaporator 4 for heat exchange. The steam releases heat and condenses and then flows into the condensate tank 6. Most of the water in the condensate tank 6 enters the condensate preheater for heat exchange and then is discharged, and a small part is used for water spray lubrication of the water vapor compressor to eliminate overheating; the external water source is supplemented to the cooling water tank 11 through the cooling water pump 12 for circulating cooling of the water vapor compressor 3, and the feed liquid entering the heat exchange coil of the cooling water tank 11 cools the cooling water while preheating itself.

[0040] Embodiment 2: Based on the skid-mounted evaporation system of Example 1, this embodiment provides a skid-mounted evaporation system operation method, using the skid-mounted evaporation system of Example 1, including: First is the preheating process: according to the liquid level in the separator 1 detected by the first liquid level meter L1, the feed amount entering the cooling water tank 11 from the feed pipeline is adjusted by the regulating valve V1. After the feed liquid enters the coil heat exchange of the cooling water tank 11, two paths of feed liquid are formed, one path of feed liquid enters the discharge waste heat preheater 7 for heat exchange, and the other path of feed liquid enters the condensed water waste heat preheater 10 for heat exchange.

[0041] Next is the evaporation separation process: Here again, the case where the evaporation separator uses the evaporator 4 and the separator 1 separately is used as an example in conjunction with the attached figure. The two preheated feed liquids enter the evaporation separator, and the feed liquid in the separator 1 is preheated according to the set liquid phase temperature control heater 15 based on the liquid phase temperature detected by the first temperature sensor T1. The feed liquid in the separator 1 is transported to the evaporator 4 through the first circulation pump 2 for heat exchange and then returns to the separator 1. The water vapor compressor 3 is started, and the secondary water vapor generated by the flash evaporation of the feed liquid or the separation from the liquid phase in the evaporation separator rises and enters the water vapor compressor 3. After being heated by the water vapor compressor 3, it enters the evaporator 4 to heat the evaporation circulation liquid, and the secondary water vapor is condensed and then enters Enter the condensate tank 6, and according to the liquid level in the condensate tank 6 detected by the second liquid level meter L2, the condensate is discharged to the condensate waste heat preheater 10 according to the set liquid level; the condensate is discharged after heat exchange or according to the liquid level of the cooling water tank 11 detected by the fourth liquid level meter L4, the condensate is replenished to the cooling water tank 11 according to the set liquid level control, and the water spray pump 99 continuously sprays the condensate into the water vapor compressor 3 to eliminate overheating and lubricate; according to the discharge flow detected by the discharge flow meter, the concentrated feed liquid in the separator 1 is continuously pumped to the discharge waste heat preheater 7 according to the set discharge flow and then discharged; Finally, the cooling process begins: the water in the cooling water tank 11 is pumped into the water chamber of the water vapor compressor 3 by the cooling water pump 12 for heat exchange and then returns to the cooling water tank 11. Based on the water temperature in the cooling water tank 11 detected by the second temperature sensor T2, water is drained and replenished according to the set temperature.

[0042] In addition, the skid-mounted evaporation system operation method of this embodiment can be cleaned in the following ways: Process 1: Cleaning of separator-circulation pump-evaporator and discharge waste heat preheater Prepare a cleaning solution of about 1m³ at 25-30°C, such as but not limited to PO-63 cleaning and descaling agent, and add it to the storage tank (storage tank volume 0.2m³) connected to the feed pipeline, and pump it into the separator 1 by the feed pump. After all the cleaning solution is added, add an appropriate amount of clean water to the storage tank and start the feed pump to clean the cleaning solution in the pipe. Turn on the first circulation pump 2 and the second circulation pump 16 for circulation cleaning, and install a three-way sampling and detection port at the discharge port of the waste heat preheater 7, and connect the other port to the spare port of the separator 1 by a hose, and turn on the discharge pump 5 for circulation cleaning. After cleaning, it is discharged from the discharge pump 5 through the discharge pipeline, and the residual cleaning solution opens the corresponding sewage valve and is discharged from the sewage pipeline. Here, a set of antiscalant barrels and metering pumps can also be set at the storage tank position. According to the feed rate of 2000L / h, a metering pump is set according to the requirements of the antiscalant to replenish the antiscalant in the storage tank.

[0043] Process 2: Cleaning of the feed pipeline If you plan to use only clean water for cleaning, add clean water to the storage tank, pump it into the separator through the feed pump, and open the drain valve of separator 1 until the water out of the drain port is as clear as the water in. If you plan to use a descaling agent for cleaning, connect the discharge port of the discharge pump 5 to the feed port of the feed pipeline, and start the feed pump to pump the pumped cleaning liquid back to separator 1 to complete the cycle.

[0044] Process 3: Cleaning of compressor-evaporator-condensate tank-condensate pipe spray pipe: If descaling agent is used for cleaning, cleaning liquid needs to be added to the condensate tank 6, which is circulated by the water spray pump 9. The condensate discharge hose is connected back to the spare port of the condensate tank 6 and circulated by the condensate pump 8. The cleaning method is the same as process one.

[0045] Process 4: Cleaning of compressor cooling circulation system: If you plan to use only clean water for cleaning, add clean water to the storage tank connected to the feed pipeline, and circulate it through the cooling water pump 12, opening the drain valve throughout the process until the return water is as clear as the inlet water.

[0046] If it is planned to use a descaling agent for cleaning, this process is performed while doing process 1, the cleaning liquid is added to the water storage tank, the cooling water pump 12 is turned on for circulation, and if the cleaning liquid is insufficient, it is continuously replenished.

[0047] Process 5: Cleaning of sewage pipes: Execute this process simultaneously while doing process 1 and process 2, close the external drain valve of the entire device, open the drain valves of evaporator 4 and separator 1, and close the drain valves of other equipment, so that the cleaning liquid can fill the drain pipe during the cleaning process, and then discharge it with clean water following process 1.

[0048] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0049] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A skid-mounted evaporation system, characterized in that: include: A feed preheating unit, comprising a cooling water tank with a heat exchange coil connected to the feed pipeline, and a preheater connected to the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensed water waste heat preheater; An evaporation separation unit, comprising an evaporation separator connected to both a discharge waste heat preheater and a condensate waste heat preheater, a water vapor compressor connected to the evaporation separator, and a condensate tank connected to the water vapor compressor; wherein the condensate tank is connected to the condensate waste heat preheater via a condensate pump; The cooling unit comprises a pipeline arranged between a cooling water tank and a water vapor compressor, and a cooling water pump arranged on the pipeline.

2. The skid-mounted evaporation system according to claim 1, characterized in that: The evaporation separator adopts an integrated evaporation separation structure having both a separation zone and an evaporation zone.

3. The skid-mounted evaporation system according to claim 2, characterized in that: The evaporation separator is also connected to an overflow tank; The overflow tank is provided with a third liquid level gauge.

4. The skid-mounted evaporation system according to claim 1, characterized in that: The evaporation separator comprises a separator and an evaporator connected by a connecting pipe; wherein The connecting pipe comprises a first connecting pipe and a second connecting pipe which are independent of each other; the first connecting pipe is provided with a first circulating pump; The discharge waste heat preheater and the condensed water waste heat preheater are respectively connected to the separator.

5. The skid-mounted evaporation system according to claim 4, characterized in that: The evaporator is also connected to a condensed water tank.

6. The skid-mounted evaporation system according to claim 4, characterized in that: The separator is equipped with a first liquid level meter and a first temperature sensor.

7. The skid-mounted evaporation system according to any one of claims 4 to 6, characterized in that: The separator is also provided with a heater for preheating the feed liquid in the separator; The heater is arranged at the bottom of the separator or on a pipeline between the separator and the first circulation pump.

8. The skid-mounted evaporation system according to claim 4, characterized in that: A discharge pipe is further arranged between the discharge waste heat preheater and the separator, and a discharge pump is arranged on the discharge pipe; and The discharge pipe is also provided with a discharge flow meter.

9. The skid-mounted evaporation system according to claim 1, characterized in that: A water spray pipe is also provided between the condensed water tank and the water vapor compressor, and a water spray pump suitable for pumping the condensed water in the condensed water tank into the water vapor compressor is arranged on the water spray pipe.

10. A skid-mounted evaporation system operation method, characterized in that: The skid-mounted evaporation system according to any one of claims 1 to 9 comprises: Preheating process: The feed liquid enters the coil of the cooling water tank from the feed pipeline for heat exchange to form two paths of feed liquid. One path of feed liquid enters the discharge waste heat preheater for heat exchange, and the other path of feed liquid enters the condensed water waste heat preheater for heat exchange; Evaporation separation process: The preheated liquid enters the evaporation separator. The secondary water vapor generated by flash evaporation or separation from the liquid phase rises and enters the water vapor compressor. After being heated by the water vapor compressor, it enters the evaporation separator to heat the evaporation circulating liquid. After the secondary water vapor is condensed, it enters the condensate tank and is discharged to the condensate waste heat preheater according to the set liquid level. The condensate is discharged after heat exchange or the condensate is controlled to replenish water to the cooling water tank according to the set liquid level. The concentrated liquid in the separator is continuously pumped to the discharge waste heat preheater according to the set discharge flow rate and then discharged. Cooling process: The water in the cooling water tank is pumped into the water chamber of the steam compressor by the cooling water pump for heat exchange and then returns to the cooling water tank.

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