Nanomembrane mvr evaporation system and evaporation process thereof

Abstract

The application discloses a kind of nanometer membrane MVR evaporation systems, including nanometer membrane evaporation component, first heat exchanger, second heat exchanger, MVR heat source supply component, one end of nanometer membrane evaporation component is provided with raw liquid input pipe, the other end of nanometer membrane evaporation component is provided with circulating inflow pipe, circulating outflow pipe, circulating inflow pipe, circulating outflow pipe are connected with first heat exchanger;MVR heat source supply component includes MVR evaporator, compressor, separator, the output end of MVR evaporator and compressor are respectively connected to the two ends of separator, the output end of compressor is connected with first heat exchanger;The output end of MVR evaporator is connected with second heat exchanger, the first lower output pipe of first heat exchanger is converged with the second lower output pipe of second heat exchanger and then backflows to MVR evaporator, steam pipeline is arranged on the upper portion of nanometer membrane evaporation component, steam pipeline is communicated with second heat exchanger.Using the present application, it can solve the problems of high energy consumption, fixed liquid volume, evaporation of high-boiling-point materials, high maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of MVR evaporation, and more particularly to a nanofilm MVR evaporation system and its evaporation process. Background Technology

[0002] Currently, MVR (Mechanical Recompression Evaporator) utilizes a steam compressor to recompress secondary steam, increasing its temperature, pressure, and enthalpy. This secondary steam is then delivered to the evaporation chamber to maintain the material's boiling state, achieving energy savings compared to conventional evaporators. MVR evaporators are made entirely of metal, and their operating temperatures are all above their boiling points.

[0003] Patent document with application number "CN201710876742.4" discloses an MVR evaporation system, including an MVR evaporator, a first pipeline, a steam compressor, a cooling pipeline, and a second pipeline. The tube side of the MVR evaporator is connected to the shell side of the MVR evaporator through the first pipeline and the steam compressor. The cooling pipeline is connected to the air inlet of the steam compressor. One end of the second pipeline is connected to the tube side, and the other end is connected to the shell side. The end of the first pipeline connected to the shell side and the other end of the second pipeline are located on both sides of the MVR evaporator, respectively. A first valve is also provided on the second pipeline.

[0004] Patent document with application number "CN201410586176.X" discloses an MVR evaporator and evaporation method. The MVR evaporator includes a separator, a heater, a steam-water separator, a compressor, a first preheater, and a second preheater. The refrigerant outlet of the first preheater is connected to the refrigerant inlet of the second preheater; the refrigerant outlet of the second preheater is connected to the raw material inlet of the separator; the circulating liquid outlet of the separator is connected to the refrigerant inlet of the heater; the refrigerant outlet of the heater is connected to the circulating liquid inlet of the separator; the steam outlet of the separator is connected to the gas inlet of the compressor; the gas outlet of the compressor is connected to the heat medium inlet of the heater; the heat medium outlet of the heater is connected to the inlet of the steam-water separator; the gas outlet of the steam-water separator is connected to the heat medium inlet of the second preheater; and the liquid outlet of the steam-water separator is connected to the heat medium inlet of the first preheater. This MVR evaporator effectively recovers waste heat and fully utilizes secondary steam, achieving energy conservation.

[0005] The aforementioned patent documents, in conjunction with existing technologies, reveal the following deficiencies in existing MVR evaporation systems and their evaporation processes:

[0006] 1. The liquid inlet volume of MVR evaporation systems on the market is fixed. Excessive or insufficient liquid inlet volume will affect the operation of the MVR evaporation system, as the liquid inlet volume will affect the operation of the downstream compressor.

[0007] 2. The compression temperature rise of commercially available MVR evaporation systems cannot provide the temperature difference required for the evaporation of materials with high boiling point rise, thus preventing the evaporation of such materials; or multiple compression stages are required to provide the necessary temperature difference, which leads to problems such as complex system structure, decreased stability and reliability, and increased equipment costs.

[0008] 3. In commercially available MVR evaporation systems, the concentrate or evaporator flows directly into the MVR evaporation system during use. Impurities in the concentrate will remain in the MVR evaporation system over a long period of time, requiring frequent maintenance, which is costly and inconvenient.

[0009] 4. When using MVR evaporation systems on the market, the material requirements of the MVR evaporation system will be different depending on the concentrate or evaporator. For example, for evaporation equipment containing chloride ions, a specific titanium alloy is generally required, which has poor versatility.

[0010] 5. Commercially available MVR evaporation systems can only use electricity and cannot utilize waste heat, resulting in high energy consumption. Summary of the Invention

[0011] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a nanofilm MVR evaporation system and its evaporation process, which can solve the problems of high energy consumption, fixed liquid feed volume, difficulty in evaporating high boiling point materials, and high maintenance costs.

[0012] One of the objectives of this invention is achieved through the following technical solution:

[0013] A nanofilm MVR evaporation system includes a nanofilm evaporation component, a first heat exchanger, a second heat exchanger, and an MVR heat source supply component. One end of the nanofilm evaporation component is provided with a raw liquid input pipe, and the other end of the nanofilm evaporation component is provided with a circulation inlet pipe and a circulation outlet pipe. The circulation inlet pipe and the circulation outlet pipe are connected to the first heat exchanger.

[0014] The MVR heat source supply assembly includes an MVR evaporator, a compressor, and a separator. The two ends of the separator are connected to the output end of the MVR evaporator and the compressor, respectively. The output end of the compressor is connected to the first heat exchanger.

[0015] The output end of the MVR evaporator is connected to the second heat exchanger. The first lower output pipe of the first heat exchanger and the second lower output pipe of the second heat exchanger merge and flow back into the MVR evaporator. A steam pipe is provided on the upper part of the nanofilm evaporation assembly, and the steam pipe is connected to the second heat exchanger.

[0016] Furthermore, the MVR evaporator is divided into an upper spray section, a middle pipeline section, and a lower negative pressure section, and the operation of the compressor creates a negative pressure space in the lower negative pressure section.

[0017] Furthermore, liquid accumulates in the lower part of the lower negative pressure section, and the lower negative pressure section is connected to the separator.

[0018] Furthermore, the MVR evaporator is provided with an initial hot water input pipe at its end, and the initial hot water input pipe is connected to the upper spray section.

[0019] Furthermore, the first lower output pipe of the first heat exchanger merges with the second lower output pipe of the second heat exchanger and flows back to the upper spray section of the MVR evaporator.

[0020] Furthermore, a concentrate discharge pipe is provided at the circulation outlet pipe, and the concentrate discharge pipe is equipped with a switch valve.

[0021] Furthermore, the nanofilm MVR evaporation system also includes a main condenser, one end of which is connected to the second heat exchanger, and the other end is provided with a condensate outlet.

[0022] An evaporation process for a nanofilm MVR evaporation system includes the following steps:

[0023] Step S10: Turn on the switch and let the stock solution at 35℃-90℃ flow into the nanofilm evaporation component;

[0024] S20 step: Inject initial hot water into the MVR evaporator;

[0025] S30 step: Turn on the compressor to put the MVR heat source supply component into operation;

[0026] S40 step: After compression, the MVR heat source supply component generates high-temperature secondary steam, which is then input into the first heat exchanger;

[0027] S50 step: The stock solution at 35℃-90℃ circulates along the stock solution input pipe and the circulation inlet pipe and exchanges heat with the high-temperature secondary steam, so that the stock solution after heat exchange flows back to the nanofilm evaporation component.

[0028] S60 step: The heat-exchanged raw liquid evaporates along the nanofilm evaporation assembly and forms water vapor;

[0029] S70 step: Water vapor flows into the second heat exchanger, and after the circulating water flowing out from the bottom of the MVR evaporator exchanges heat with the water vapor, it flows back into the MVR evaporator.

[0030] Furthermore, in step S20, when “injecting initial hot water into the MVR evaporator”, the temperature of the initial hot water is 70°C-80°C.

[0031] Furthermore, in step S40, when "the MVR heat source supply component compresses and generates high-temperature secondary steam, and inputs the high-temperature secondary steam into the first heat exchanger", the temperature of the high-temperature secondary steam is 101℃-105℃.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. The nanofilm evaporation unit is made of polymer and can meet the needs of all types of liquids, with good versatility. At the same time, the nanofilm evaporation unit uses a fan, low-pressure steam, waste heat and exhaust heat, with a temperature rise of 5-8℃. Under the same evaporation capacity, it can save about 50% of electricity compared with MVR.

[0034] 2. Two heat circulation circuits are formed by using nanofilm evaporation components, a first heat exchanger, a second heat exchanger, and an MVR heat source supply component. This results in high heat utilization efficiency, full utilization of waste heat, and good energy-saving effect.

[0035] 3. Strong anti-scaling ability. Nanofilm evaporators operate under normal pressure and temperature conditions, and can also operate under acidic conditions. Calcium and magnesium ions do not easily cause scaling. MVR evaporators require the concentration of calcium and magnesium ions in the influent to be less than 100 mg / L; otherwise, scaling will be rapid and easy to form during high-temperature evaporation, which not only affects the operating efficiency of the MVR equipment but also poses potential safety hazards.

[0036] 4. The MVR evaporator uses fresh or pure water for circulation, which allows the MVR evaporator and the connected steam compressor to be made of common materials (such as 304 stainless steel), which not only reduces the cost of related equipment, but also prevents corrosion and ensures long-term stable operation.

[0037] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0038] Figure 1 This is a structural block diagram of a preferred embodiment of the nanofilm MVR evaporation system of the present invention;

[0039] Figure 2 for Figure 1 A partial structural block diagram of the nanofilm MVR evaporation system is shown below.

[0040] Figure 3 This is a schematic diagram of the nanofilm MVR evaporation process.

[0041] Figure 4 A graph showing the boiling point of water versus pressure;

[0042] Figure 5 A table of boiling point and pressure data for water;

[0043] Figure 6 This is a schematic diagram of a preferred embodiment of the nanofilm evaporation assembly of the present invention;

[0044] Figure 7 This is a perspective view of a preferred embodiment of a heat sink;

[0045] Figure 8 This is a magnified view of a portion of the heat sink at point A.

[0046] Figure 9 This is a magnified view of a portion of the heat sink at point B.

[0047] Figure 10 This is another 3D view of the heat sink;

[0048] Figure 11 This is another 3D view of the heat sink;

[0049] Figure 12 for Figure 11 A magnified view of a portion of the heat sink at point C shown.

[0050] Figure 13 for Figure 11 A magnified view of a portion of the heat sink at point D;

[0051] Figure 14 This is a schematic diagram of the first engineering example using this application;

[0052] Figure 15 This is a schematic diagram of the second engineering example using this application;

[0053] Figure 16 This is a schematic diagram of the third engineering example using this application;

[0054] Figure 17 This is a schematic diagram of the fourth engineering case using this application;

[0055] Figure 18 This is a schematic diagram of the fifth engineering case using this application;

[0056] Figure 19 This is a schematic diagram of the sixth engineering case using this application.

[0057] In the diagram: 110, Nanofilm evaporation assembly; 111, Raw liquid inlet pipe; 112, Circulating inlet pipe; 113, Circulating outlet pipe; 120, First heat exchanger; 1201, First lower outlet pipe; 130, Second heat exchanger; 1301, Second lower outlet pipe; 140, Condenser; 1200, MVR heat source supply assembly; 150, MVR evaporator; 151, Initial hot water inlet pipe; 160, Compressor; 170, Separator; 190, Concentrate outlet pipe; 191, Switch valve; 1000, Pending processing... 100. Concentrated liquid; 200. Constant temperature heating box; 300. Evaporator; 10. Heat sink; 11. Main body; 12. Central through hole; 12. Suction end; 121. Connecting hole; 122. Cylindrical through hole; 123. Protrusion; 124. Recessed groove; 13. Suction end; 14. Side mounting hole; 15. Side snap-fit ​​groove; 16. Frame mounting groove; 20. Frame mounting structure; 40. Pressure strip; 41. Snap-fit ​​protrusion; 400. Steam pipe; 500. Condenser; 600. Water suction pipe; 700. Return pump. Detailed Implementation

[0058] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0059] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0061] Please see Figure 1-2A nanofilm MVR evaporation system includes a nanofilm evaporation component 110, a first heat exchanger 120, a second heat exchanger 130, and an MVR heat source supply component 1200. One end of the nanofilm evaporation component 110 is provided with a raw liquid input pipe 111, and the other end of the nanofilm evaporation component 110 is provided with a circulation inflow pipe 112 and a circulation outflow pipe 113. The circulation inflow pipe 112 and the circulation outflow pipe 113 are connected to the first heat exchanger 120.

[0062] The MVR heat source supply assembly 1200 includes an MVR evaporator 150, a compressor 160, and a separator 170. The two ends of the separator 170 are respectively connected to the output end of the MVR evaporator 150 and the compressor 160. The output end of the compressor 160 is connected to the second heat exchanger 130.

[0063] The output end of the MVR evaporator 150 is connected to the second heat exchanger 130. The first lower output pipe 1201 of the first heat exchanger 120 and the second lower output pipe 1301 of the second heat exchanger 130 merge and flow back into the MVR evaporator 150. A steam pipe is provided on the upper part of the nanofilm evaporation assembly 110, and the steam pipe is connected to the second heat exchanger 130.

[0064] It has the following advantages:

[0065] 1. The nanofilm evaporation unit is made of polymer and can meet the needs of all types of liquids, with good versatility. At the same time, the nanofilm evaporation unit uses a fan, low-pressure steam, waste heat and exhaust heat, with a temperature rise of 5-8℃. Under the same evaporation capacity, it can save about 50% of electricity compared with MVR.

[0066] 2. Two heat circulation circuits are formed by using a nanofilm evaporation component 110, a first heat exchanger 120, a second heat exchanger 130, and an MVR heat source supply component 1200, which has a high heat utilization rate and good energy-saving effect.

[0067] 3. Strong anti-scaling ability. Nanofilm evaporators operate at normal pressure and temperature or low temperature, unlike MVR evaporators, and can also operate under acidic conditions. Calcium and magnesium ions are less likely to cause scaling. MVR evaporators require the concentration of calcium and magnesium ions in the influent to be less than 100 mg / L; otherwise, scaling is rapid and easy to form during high-temperature evaporation, which not only affects the operating efficiency of the MVR equipment but also poses potential safety hazards.

[0068] 4. Energy saving and carbon reduction. Under normal pressure, the operating temperature of a nanofilm evaporator is generally 60-80℃, and for some materials it can be as low as 30-40℃. Low-grade waste heat can be used as a heat source, reducing energy consumption and operating costs. MVR can only use high-grade thermal energy such as electricity and steam.

[0069] 5. Strong corrosion resistance. The parts of the nanofilm evaporator that come into contact with the material are made of highly corrosion-resistant polymer materials, thus possessing excellent corrosion resistance and anti-fouling capabilities, making it suitable for corrosive conditions such as strong acids and alkalis. MVRs use metallic materials, and specific metallic materials must be selected for specific materials, making material selection quite stringent.

[0070] 6. Strong anti-scaling ability. Nanofilm evaporators operate at normal pressure and temperature or low temperature, unlike MVR evaporators, and can also operate under acidic conditions. Calcium and magnesium ions are less likely to cause scaling. MVR evaporators require the concentration of calcium and magnesium ions in the influent to be less than 100 mg / L; otherwise, scaling is rapid and easy to form during high-temperature evaporation, which not only affects the operating efficiency of the MVR equipment but also poses potential safety hazards.

[0071] 7. Suitable for fluorine-containing materials. Nanofilm evaporators can handle fluorine-containing materials, while MVR evaporators cannot, as this will cause corrosion of the titanium material.

[0072] 8. High-quality produced water. The atmospheric pressure and low-temperature evaporation characteristics of nanofilm evaporators can greatly inhibit and reduce the volatilization of substances, resulting in excellent quality produced water; the quality of produced water from MVR evaporators is greatly affected by the composition of raw materials, and the produced water may fail to meet the standards or exceed the standards for COD and ammonia nitrogen.

[0073] 9. No pH restrictions. Nanofilm evaporators have no requirements or restrictions on the pH value of the materials; however, MVR evaporators require a pH value of 5-8, and should not be too high or too low.

[0074] 10. Flexible assembly of processing capacity. The nanofilm evaporator adopts a modular structure, which can be flexibly installed in a distributed or centralized manner according to the on-site working conditions. It can also gradually increase the number of membrane modules and increase the processing capacity according to the production capacity.

[0075] 11. Simple and safe operation. The nanofilm evaporator operates under normal pressure and temperature conditions, has a simple structure, is safe to operate, has a high degree of automation, and low labor costs.

[0076] 12. The MVR evaporator uses fresh or pure water for circulation, which allows the MVR evaporator and the connected steam compressor to be made of common materials (such as 304 stainless steel), which not only reduces the cost of related equipment, but also prevents corrosion and ensures long-term stable operation.

[0077] 13. Existing technologies present difficulties when evaporating high-boiling-point materials. Taking sodium hydroxide as an example, initially, the concentration is low, and the boiling point is low (slightly above 100℃). The higher the concentration, the higher the boiling point; at a concentration of 50%, the boiling point is around 140℃. However, typical negative-pressure steam operates at around 110℃, which is insufficient for evaporation, making it difficult to meet the evaporation requirements of high-concentration materials. Continuing evaporation at this point would necessitate adding secondary or tertiary compression, resulting in significant investment. In practice, evaporation is not achieved through temperature differences, but rather through the vapor pressure difference between the inner and outer sides of the nanofilm evaporator. Please refer to [link / reference needed]. Figure 13-19 The image shown is an example of an application using this method.

[0078] Specifically, the MVR evaporator 150 is divided into an upper spray section, a middle pipeline section, and a lower negative pressure section. The operation of the compressor 160 creates a negative pressure space in the lower negative pressure section. Liquid accumulates at the bottom of the lower negative pressure section, which is connected to the separator 170. An initial hot water inlet pipe 151 is provided at the end of the MVR evaporator 150, and the initial hot water inlet pipe 151 is connected to the upper spray section. The first lower outlet pipe 1201 of the first heat exchanger 120 and the second lower outlet pipe 1301 of the second heat exchanger 130 merge and flow back to the upper spray section of the MVR evaporator 150. A concentrated liquid outlet pipe 190 is provided at the circulation outlet pipe 113, and a switch valve 191 is provided on the concentrated liquid outlet pipe 190. The nanofilm MVR evaporation system also includes a main condenser 140, one end of which is connected to the second heat exchanger 130, and the other end is provided with a condensate outlet. During the operation of the nanofilm MVR evaporation system, when the evaporation reaches a certain level, the switch valve 191 is opened, and the concentrate is discharged along the concentrate discharge pipe 190.

[0079] Please see Figure 3-5 An evaporation process for a nanofilm MVR evaporation system includes the following steps:

[0080] Step S10: Turn on the switch and let the stock solution at 35℃-90℃ flow into the nanofilm evaporation component;

[0081] Step S20: Inject initial hot water into the MVR evaporator; preferably, in step S20, the temperature of the initial hot water is 70℃-80℃ when "injecting initial hot water into the MVR evaporator". Specifically, the temperature of the initial hot water can be adjusted to 75℃.

[0082] S30 step: Turn on the compressor to put the MVR heat source supply component into operation;

[0083] Step S40: After compression, the MVR heat source supply component generates high-temperature secondary steam, which is then input into the first heat exchanger. Preferably, in step S40, when "the MVR heat source supply component generates high-temperature secondary steam after compression and inputs it into the first heat exchanger", the temperature of the high-temperature secondary steam is 101℃-105℃, and the specific temperature of the high-temperature secondary steam can be adjusted to 103℃.

[0084] S50 step: The stock solution at 35℃-90℃ circulates along the stock solution input pipe and the circulation inlet pipe and exchanges heat with the high-temperature secondary steam, so that the stock solution after heat exchange flows back to the nanofilm evaporation component.

[0085] S60 step: The heat-exchanged raw liquid evaporates along the nanofilm evaporation assembly and forms water vapor;

[0086] S70 step: Water vapor flows into the second heat exchanger, and after the circulating water flowing out from the bottom of the MVR evaporator exchanges heat with the water vapor, it flows back into the MVR evaporator.

[0087] Please see Figure 6-13 This is a detailed structural diagram of a nanofiber evaporation assembly, including a constant-temperature heating chamber 100, an evaporation chamber 200, several heat sinks 300 containing nanofiber membranes, a steam pipe 400, a condenser 500, a water suction pipe 600, and a reflux pump 700. The constant-temperature heating chamber 100 is connected to the evaporation chamber 200. The heat sinks 300 filter and evaporate water vapor through the nanofiber membranes on their surfaces. The heat sinks 300 are distributed inside the evaporation chamber 200. The upper part of the evaporation chamber 200 is connected to the steam pipe 400, and the steam pipe 400 is connected to the condenser 500. The heat sinks 300 are covered with nanofiber membranes. The system includes an input end and an output end. The suction pipe 600 is connected to the input end of the heat sink 300. The output ends of several heat sinks 300 converge and are connected to the reflux pump 700, which is connected to the constant temperature heating chamber 100. The constant temperature heating chamber 100 heats the concentrated liquid 1000 to a certain temperature. The pump body drives the suction pipe 600 to divert the raw liquid to several heat sinks 300 for evaporation. The evaporated gas flows into the condenser 500 along the steam pipe 400 for cooling. The unevaporated liquid flows back to the constant temperature heating chamber 100 through the reflux pump 700. On the one hand, using the constant temperature heating chamber 100 to heat to a certain temperature eliminates the need for high-temperature and high-pressure evaporation purification, solving the problems of high cost and inconvenient maintenance. On the other hand, it avoids the evaporation of organic matter in the raw liquid under high temperature and high pressure, improving the purification effect of the raw liquid. The organic matter precipitates and crystallizes in the constant temperature heating chamber, making it easy to clean. The evaporation of the raw liquid through several heat sinks 300 results in good evaporation effect.

[0088] Specifically, in practical applications, the constant temperature heating box 100 is equipped with a water inlet solenoid valve, which is controlled by a PLC and has limit switches for low and high water flow, facilitating the discharge of raw liquid.

[0089] Specifically, the structure of the heatsink is explained below:

[0090] The heat sink includes a main body 10 and two evaporation films distributed on both sides of the main body 10. The main body 10 has a central through-hole 11 in its middle. The main body 10 has an exhaust end 12 and an intake end 13 at its two ends, respectively. The exhaust end 12 and the intake end 13 have the same structure. The exhaust end 12 also has a connecting hole 121, a cylindrical through-hole 122, a protrusion 123, and a recessed groove 124. The cylindrical through-hole 122 penetrates the exhaust end 12. The connecting hole 121 communicates with both the cylindrical through-hole 122 and the central through-hole 11. The protrusion 123 and the recessed groove 124 are distributed on both sides of the cylindrical through-hole 122. The two evaporation films and the central through-hole 11 form a flow space. The original liquid flows into the flow space along the intake end 13 and then flows out along the exhaust end 12. Water cannot pass through the evaporation films, but gas can. The evaporation films are made of a highly hydrophobic material. The evaporation membrane is covered with a nanofiber layer. The pore size of the nanofiber layer is 5-60 nm. The highly hydrophobic material prevents water from flowing out along the heat sink 300, but gas molecules are discharged along the highly hydrophobic material and filtered through the nanofiber layer before water vapor is collected, which greatly improves the purification effect.

[0091] Specifically, the heat sink further includes several clamping strips 40, and several side mounting holes 14 are provided on the side of the heat sink. Several side snap-fit ​​grooves 15 are provided on both sides of the main body 10, and snap-fit ​​protrusions 41 are provided at both ends of the clamping strips 40. The snap-fit ​​protrusions 41 snap into the side snap-fit ​​grooves 15, and the clamping strips 40 are attached to the evaporation film. Several clamping strips 40 are arranged in parallel. The protrusion 123 is annular, and the recessed groove 124 matches the protrusion 123. The heat sink also includes a frame-type mounting structure 20, and the main body 10 is also provided with a frame-type mounting groove 16. The frame-type mounting groove 16 is distributed outside the central through hole 11, and the frame-type mounting structure 20 is fixedly installed in the frame-type mounting groove 16. The evaporation film is fixed on the frame-type mounting structure 20. The main body 10 is rectangular, and the suction end 12 is annular. The number of suction ends 12 and suction ends 13 are the same, and there are two suction ends 12.

[0092] Preferably, the heating temperature of the constant temperature heating chamber 100 is 20-80℃. The constant temperature heating chamber 100 is equipped with a low water level alarm, installed at a height of 3-5cm from the bottom of the chamber. When the water level is too low, an alarm is triggered, allowing management personnel to easily monitor the situation and promptly replenish the stock solution. Similarly, the constant temperature heating chamber 100 is equipped with a high water level alarm. Specifically, the heating temperature of the constant temperature heating chamber 100 is 60-80℃. The raw liquid is heated to 60-80℃ and kept at that temperature. It should be noted that water evaporation can occur at any temperature. For example, if you look at the water in a cup after a period of time, you will find that the water volume has decreased at room temperature. Therefore, temperature only affects the rate of water evaporation. In daily life, the atmosphere is a mixture, so the partial pressure of water vapor is less than 0.1MPa. The temperature required for water exposed to the atmosphere to vaporize is less than 100℃. When the temperature is less than 100℃ but greater than the temperature required for vaporization, vaporization only occurs at the interface between water and air, i.e., evaporation. In this application, by setting the temperature of the raw liquid at 60-80℃, on the one hand, evaporation purification is ensured, and on the other hand, the evaporation of organic matter is minimized. A balance is found between the two, so that the pure part of the raw liquid is released as much as possible in the form of water vapor, while the remaining organic matter and salts are treated by concentration and crystallization precipitation. This is completely different from the high temperature and high pressure evaporation purification in conventional technology and has a better purification effect.

[0093] Preferably, the heat sink 300 includes two evaporation films, with a liquid flow channel formed between the two films, allowing vapor to evaporate along the evaporation films. Specifically, the evaporation films are made of a highly hydrophobic material. A nanofiber layer covers the evaporation films. The pore size of the nanofiber layer is 5-60 nm. The highly hydrophobic material prevents water from flowing out along the heat sink 300, but gas molecules are discharged along the highly hydrophobic material and filtered through the nanofiber layer before water vapor is collected, greatly improving the purification effect.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0095] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A nanofilm MVR evaporation system, comprising a nanofilm evaporation assembly, a first heat exchanger, a second heat exchanger, and an MVR heat source supply assembly, characterized in that: One end of the nanofilm evaporation assembly is provided with a raw liquid input pipe, and the other end of the nanofilm evaporation assembly is provided with a circulation inflow pipe and a circulation outflow pipe. The circulation inflow pipe and the circulation outflow pipe are connected to the first heat exchanger. The MVR heat source supply assembly includes an MVR evaporator, a compressor, and a separator. The two ends of the separator are respectively connected to the output end of the MVR evaporator and the compressor. The output end of the compressor is connected to the first heat exchanger. The output end of the MVR evaporator is connected to the second heat exchanger. The first lower output pipe of the first heat exchanger and the second lower output pipe of the second heat exchanger merge and flow back into the MVR evaporator. A steam pipe is provided on the upper part of the nanofilm evaporation assembly, and the steam pipe is connected to the second heat exchanger. The working fluid circulating inside the MVR evaporator is pure water or fresh water; The MVR evaporator is divided into an upper spray section, a middle pipeline section, and a lower negative pressure section. The operation of the compressor creates a negative pressure space in the lower negative pressure section. Liquid accumulates in the lower part of the lower negative pressure section, and the lower negative pressure section is connected to the separator; An initial hot water inlet pipe is provided at the end of the MVR evaporator, and the initial hot water inlet pipe is connected to the upper spray section; After the first lower output pipe of the first heat exchanger merges with the second lower output pipe of the second heat exchanger, the water flows back to the upper spray section of the MVR evaporator. A concentrate discharge pipe is provided at the circulation outlet pipe, and a switch valve is provided at the concentrate discharge pipe. The nanofilm MVR evaporation system also includes a main condenser. One end of the nanofilm MVR evaporation system is connected to the second heat exchanger, and the other end is provided with a condensate outlet. The nanofilm evaporation module operates at atmospheric pressure and a temperature of 60°C-80°C to utilize low-grade waste heat or residual heat as a heat source.

2. An evaporation process for the nanofilm MVR evaporation system according to claim 1, characterized in that, Includes the following steps: Step S10: Turn on the switch and let the stock solution at 35℃-90℃ flow into the nanofilm evaporation component; S20 step: Inject initial hot water into the MVR evaporator; Among them, when "injecting initial hot water into the MVR evaporator", the temperature of the initial hot water is 70℃-80℃; S30 step: Turn on the compressor to put the MVR heat source supply component into operation; S40 step: After compression, the MVR heat source supply component generates high-temperature secondary steam, which is then input into the first heat exchanger; In the case of "the MVR heat source supply component compresses and generates high-temperature secondary steam, and inputs the high-temperature secondary steam into the first heat exchanger", the temperature of the high-temperature secondary steam is 101℃-105℃. S50 step: The stock solution at 35℃-90℃ circulates along the stock solution input pipe and the circulation inlet pipe and exchanges heat with the high-temperature secondary steam, so that the stock solution after heat exchange flows back to the nanofilm evaporation component. S60 step: The heat-exchanged raw liquid evaporates along the nanofilm evaporation assembly and forms water vapor; S70 step: Water vapor flows into the second heat exchanger, and the circulating water flowing out from the bottom of the MVR evaporator exchanges heat with the water vapor and then flows back into the MVR evaporator; The first lower output pipe of the first heat exchanger merges with the second lower output pipe of the second heat exchanger and flows back into the MVR evaporator.

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