Dehumidifier regeneration type air water taking system based on mechanical vapor recompression

Abstract

The invention provides a mechanical vapor recompression-based dehumidizer regeneration type air water taking system, which comprises a moisture absorption unit, which comprises a gas-liquid contact reaction device, and is used for enabling a dehumidizer solution to be in full contact with air for mass transfer and heat transfer, and enabling the dehumidizer solution to absorb moisture in the air so as to be diluted; the mechanical vapor recompression evaporator comprises an evaporator and a compressor, the evaporator comprises a dilute solution inlet, a concentrated solution outlet, a vapor outlet, a vapor inlet and a condensed water outlet, the evaporator comprises a dehumidizer channel capable of containing a dehumidizer solution, and the dilute solution inlet and the concentrated solution outlet are connected to the moisture absorption unit; the dilute solution inlet is used for receiving the diluted desiccant solution, the concentrated solution outlet is used for leading the evaporated and concentrated desiccant solution to the moisture absorption unit, the compressor comprises a compressor inlet and a compressor outlet, the compressor inlet is connected to the steam outlet, and the compressor outlet is connected to the steam inlet.

Description

Technical Field

[0001] This application belongs to the field of water resource recycling and high-efficiency heat energy recovery technology, and specifically relates to a desiccant regeneration air water intake system based on mechanical vapor recompression. Background Technology

[0002] Air-based water extraction technology is an important method for obtaining freshwater resources from the ambient atmosphere, and it is of great significance for alleviating water shortages in arid regions, off-grid islands, and specific industrial settings (such as electronics, pharmaceuticals, and laboratories). Currently, the mainstream technical approaches in this field include condensation and adsorption methods, each with its own characteristics but also significant limitations.

[0003] Condensation is a widely used air-to-water extraction technology. A condensation water extraction system includes an air compressor, a refrigeration unit, a condenser heat exchanger, and a water collection device. The air is cooled to below the dew point temperature through a refrigeration cycle, causing water vapor to condense into liquid water.

[0004] Although condensation water extraction exhibits good performance in high-humidity environments (e.g., relative humidity greater than 70%), its efficiency is heavily dependent on ambient humidity conditions. Under low-humidity conditions (e.g., relative humidity less than 40%), the energy consumption of condensation water extraction systems increases dramatically, typically requiring over 1000 kWh of electricity to produce one ton of water. The coefficient of performance (COP) is generally below 2.0, leading to a significant decrease in operational economics and even instability, severely limiting the practical application of this technology in low-humidity areas. Furthermore, the purity of the water produced by condensation directly depends on air cleanliness, and the atmosphere typically contains soluble gaseous pollutants (such as SO₂). x NO x NH x Volatile organic compounds (VOCs, etc.) dissolve in condensate, introducing ionic impurities and organic components, leading to increased water conductivity and pH shifts, potentially affecting sensory quality and safety. Simultaneously, aerosol particles in the air (such as inorganic salts, mineral dust, and biological particles) are also captured by condensate, causing increased turbidity and posing a risk of microbial contamination. This results in water quality that fails to meet the application requirements in some situations, often necessitating complex post-treatment processes.

[0005] Adsorption is an effective method for addressing moisture absorption in low-humidity environments, with liquid adsorption technology based on hygroscopic salts being one of the mainstream technologies currently available. The adsorption water extraction system includes a moisture absorption unit and a regeneration unit. Within the moisture absorption unit, a high-concentration hygroscopic salt solution can efficiently capture moisture within a wide humidity range (relative humidity 10% to 90%) through gas-liquid contact methods such as bubbling or spraying, exhibiting significantly better environmental adaptability than condensation methods.

[0006] However, the regeneration process of hygroscopic salt solutions typically relies on high-temperature heating (such as steam or electric heating) to achieve water desorption and solution concentration, resulting in high energy consumption and a coefficient of performance (COP) often below 1. Each ton of water produced requires approximately 700 to 1000 kWh of thermal energy. More importantly, traditional thermal regeneration processes only achieve phase change separation of water without purifying the extracted water. If high-purity water is required, distillation or membrane treatment equipment is still necessary, making the system complex and costly.

[0007] Therefore, current air-to-water technology faces multiple challenges, including high energy consumption in low humidity environments, low regeneration efficiency, the inability of the produced water to directly meet high purity requirements, and difficulties in scaling up equipment. Summary of the Invention

[0008] This application aims to propose a desiccant regeneration air-water intake system based on mechanical vapor recompression, which solves at least one problem existing in the prior art.

[0009] This application proposes a desiccant regeneration air-water extraction system based on mechanical vapor recompression, comprising: a moisture absorption unit, which includes a gas-liquid contact reaction device, used to ensure sufficient contact between the desiccant solution and air for mass and heat transfer, wherein the desiccant solution absorbs moisture from the air and is thus diluted; and a mechanical vapor recompression evaporator, which includes an evaporator and a compressor, the evaporator including a dilute solution inlet, a concentrated solution outlet, a steam outlet, a steam inlet, and a condensate outlet, the evaporator being capable of containing the desiccant solution, the dilute solution inlet and the concentrated solution outlet being connected to... The desiccant unit has a dilute solution inlet for receiving the diluted desiccant solution and a concentrated solution outlet for directing the evaporated and concentrated desiccant solution to the desiccant unit. The compressor includes a compressor inlet and a compressor outlet. The compressor inlet is connected to the steam outlet, and the compressor outlet is connected to the steam inlet. Water vapor entering the evaporator from the steam inlet heats the diluted desiccant solution, causing it to evaporate and generate water vapor. The water vapor then enters the compressor through the steam outlet, where it condenses to produce liquid water.

[0010] In at least one possible implementation, the evaporator includes a water production channel, which is an independent, closed channel physically isolated from the desiccant solution inside the evaporator, and the steam inlet and the condensate outlet are located at the inlet and outlet ends of the water production channel, respectively.

[0011] In at least one possible implementation, the moisture absorption unit includes a spray tower, a bubble tower, or a packed tower.

[0012] In at least one possible implementation, a water quality monitoring device is provided at the outlet end of the water production channel to monitor the water quality indicators of the condensate discharged from the condensate outlet in real time.

[0013] In at least one possible implementation, both the water production channel and the desiccant channel are made of a material resistant to halide corrosion.

[0014] In at least one possible implementation, both the water production channel and the desiccant channel are made of stainless steel.

[0015] In at least one possible implementation, the air-water intake system includes a heat exchanger disposed between the moisture absorption unit and the evaporator. The heat exchanger includes a cold-side channel and a hot-side channel. The inlet of the cold-side channel is connected to the desiccant outlet of the moisture absorption unit, the outlet of the cold-side channel is connected to the dilute solution inlet of the evaporator, the inlet of the hot-side channel is connected to the concentrated solution outlet of the evaporator, and the outlet of the hot-side channel is connected to the desiccant inlet of the moisture absorption unit or a desiccant storage tank. The heat exchanger preheats the diluted desiccant solution.

[0016] In at least one possible implementation, the compressor is a multi-stage compressor, which includes a Roots compressor and a centrifugal compressor connected in sequence, or a combination of at least two of a centrifugal compressor, a Roots compressor, and a screw compressor.

[0017] In at least one possible implementation, the moisture-absorbing unit is provided with an air inlet and a desiccant inlet, the desiccant inlet being located at the top or upper part of the moisture-absorbing unit, and the air inlet being located at the bottom or lower part of the moisture-absorbing unit, wherein the air and the desiccant solution are in countercurrent contact inside the moisture-absorbing unit.

[0018] In at least one possible embodiment, the desiccant solution is a hygroscopic salt solution, wherein the hygroscopic salt includes at least one of calcium chloride, lithium chloride, calcium bromide, lithium bromide, magnesium chloride, phosphorus trichloride, phosphorus pentachloride, magnesium perchlorate, sodium hydroxide, potassium hydroxide, calcium nitrate, magnesium nitrate, potassium acetate, disodium hydrogen phosphate, and sodium sulfate.

[0019] By adopting the above technical solution, the desiccant regeneration air water intake system based on mechanical vapor recompression of this application can produce a large amount of pure fresh water under low humidity conditions, and has low energy consumption. Attached Figure Description

[0020] Figure 1 A schematic diagram of a desiccant regeneration air-water intake system based on mechanical vapor recompression according to an embodiment of this application is shown.

[0021] Explanation of reference numerals in the attached figures

[0022] 100 Mechanical vapor recompression evaporator

[0023] 1. Moisture absorption unit; 11. Air inlet; 12. Air outlet; 13. Desiccant inlet; 14. Desiccant outlet.

[0024] 2. Evaporator 21. Dilute solution inlet 22. Concentrated solution outlet 23. Steam outlet 24. Steam inlet 25. Condensate outlet 26. Water quality monitoring device

[0025] 3. Compressor 31. Compressor inlet 32. Compressor outlet Detailed Implementation

[0026] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0027] like Figure 1 As shown, the embodiments of this application propose a desiccant regeneration air water intake system based on mechanical vapor recompression (hereinafter referred to as "air water intake system"), which includes a moisture absorption unit 1, a mechanical vapor recompression evaporator 100 (MVR evaporator) and a solution circulation system.

[0028] The moisture absorption unit 1 includes a gas-liquid contact device, such as a spray tower, a bubble tower, or a packed tower.

[0029] Furthermore, the packed tower can be filled with structured packing material with a large specific surface area, allowing the concentrated desiccant solution to flow from top to bottom along the surface of the packing material. This enables the concentrated desiccant solution to fully contact the air for mass and heat transfer, and allows the concentrated desiccant solution to absorb moisture from the air.

[0030] Such a gas-liquid contact device can increase the contact area and time between low-humidity air and concentrated desiccant solution, thus enabling a considerable amount of water absorption per unit time even in environments with relative humidity as low as 10%, laying the foundation for large-scale water production. The concentrated desiccant solution in the gas-liquid contact device absorbs water vapor from the air. During the moisture absorption process, the concentrated desiccant solution is diluted into a dilute desiccant solution due to the increase in moisture content.

[0031] The moisture absorption unit 1 may include an air inlet 11, an air outlet 12, a desiccant inlet 13, and a desiccant outlet 14. Air can enter the moisture absorption unit 1 through the air inlet 11, and a concentrated desiccant solution can enter the moisture absorption unit 1 through the desiccant inlet 13. In the moisture absorption unit 1, the concentrated desiccant solution can absorb moisture from the air. The concentrated desiccant solution is diluted into a dilute desiccant solution and can be discharged from the moisture absorption unit 1 through the desiccant outlet 14. The air that has had its moisture absorbed can be discharged from the moisture absorption unit 1 through the air outlet 12.

[0032] The mechanical vapor recompression evaporator (MVR) 100 may include an evaporator 2 and a compressor 3.

[0033] Evaporator 2 is used to receive and contain the dilute desiccant solution discharged from desiccant outlet 14 of desiccant unit 1. It can be heated with high-temperature steam to evaporate the dilute desiccant solution into water vapor. After the water evaporates, the dilute desiccant solution is reconcentrated into a concentrated desiccant solution; this process can be called desiccant regeneration. The concentrated desiccant solution can be reused for moisture absorption, allowing the desiccant to be recycled.

[0034] Evaporator 2 may include a water production channel and a desiccant channel. The desiccant channel is used to contain the desiccant. The water production channel forms an independent and closed channel that is physically completely isolated from the desiccant. The desiccant solution (including concentrated desiccant solution and dilute desiccant solution) inside the water production channel and the desiccant channel of evaporator 2 are physically completely isolated.

[0035] The desiccant solution can be a hygroscopic salt solution, which includes at least one of the following: calcium chloride, lithium chloride, calcium bromide, lithium bromide, magnesium chloride, phosphorus trichloride, phosphorus pentachloride, magnesium perchlorate, sodium hydroxide, potassium hydroxide, calcium nitrate, magnesium nitrate, potassium acetate, disodium hydrogen phosphate, and sodium sulfate. These hygroscopic salts are preferred due to their high hygroscopicity, low vapor pressure, and stable chemical properties in solution.

[0036] Evaporator 2 may include a dilute solution inlet 21, a concentrated solution outlet 22, a steam outlet 23, a steam inlet 24, and a condensate outlet 25.

[0037] The dilute solution inlet 21 can be connected to the desiccant outlet 14, and the concentrated solution outlet 22 can be connected to the desiccant inlet 13.

[0038] One end (inlet end) of the water production channel can be connected to the steam inlet 24, and the other end (outlet end) of the water production channel can be connected to the condensate outlet 25. High-temperature steam can be introduced into the steam inlet 24. The high-temperature steam is used to heat the dilute desiccant solution to make the dilute desiccant solution evaporate. The high-temperature steam in the water production channel releases heat energy and condenses into water. The condensate can be discharged from the condensate outlet 25.

[0039] The water production channel includes the main body of the channel and other components connected to the main body (such as heat exchange tubes of the evaporator, valves, water storage tanks, etc.). All connection interfaces are equipped with sealing structures to prevent environmental pollutants from entering the water production channel and to ensure that the water obtained from the condensation of water vapor is not subject to secondary pollution after generation.

[0040] The water production channel and desiccant channel can be made of halogen-resistant materials. These materials are inert and prevent the leaching of metal ions that could contaminate the water. Examples of halogen-resistant materials include stainless steel (such as S31603 stainless steel (i.e., 316L stainless steel) as specified in GB / T20878-2019) or non-metallic materials. The water production channel should have good cleanliness and sealing to prevent condensate from being contaminated during production and collection.

[0041] A water quality monitoring device 26 can be installed at the outlet end of the water production channel (i.e., condensate outlet 25). The water quality monitoring device 26 may include a conductivity meter (e.g., model CM-230), pH meter, TOC analyzer, silica meter, turbidity / suspended solids meter, online water hardness analyzer, oxidation-reduction potential meter, sodium ion concentration meter, and residual chlorine / ozone analyzer. The water quality monitoring device 26 can monitor the water quality of the condensate in real time and continuously, and can interlock to control the discharge of water production or system alarm.

[0042] The compressor 3 may be equipped with a compressor inlet 31 and a compressor outlet 32. The compressor inlet 31 may be connected to the steam outlet 23, and the compressor outlet 32 ​​may be connected to the steam inlet 24. The compressor 3 is used to receive water vapor generated by the evaporation of the dilute desiccant solution in the evaporator 2. The water vapor can be pressurized and heated by the compressor 3 to form high-temperature steam. Then, the high-temperature steam can enter the evaporator through the steam inlet 24 as a heat source for heating the evaporating desiccant.

[0043] It is understandable that steam can be transported using a steam pump. For example, a steam pump can be installed between compressor outlet 32 ​​and steam inlet 24, and between compressor inlet 31 and steam outlet 23.

[0044] Optionally, compressor 3 may include a multi-stage compressor, which may be connected in sequence. For example, compressor 3 may include a Roots compressor (e.g., model: RZ-35, compression ratio 2.5) and a centrifugal compressor connected in sequence, or it may be a combination of at least two of centrifugal compressors, Roots compressors and screw compressors to adapt to different flow rate, temperature rise and pressure ratio requirements.

[0045] Furthermore, the air-to-water system may also include a heat exchanger, which may be disposed between the moisture absorption unit 1 and the evaporator 2. The heat exchanger may include a cold-side passage and a hot-side passage.

[0046] The inlet of the cold-side passage of the heat exchanger can be connected to the desiccant outlet 14 of the desiccant unit 1, and the outlet of the cold-side passage can be connected to the dilute solution inlet 21 of the evaporator 2. The inlet of the hot-side passage of the heat exchanger can be connected to the concentrated solution outlet 22 of the evaporator 2, and the outlet of the hot-side passage can be connected to the desiccant inlet 13 of the desiccant unit 1 or the desiccant storage tank (concentrated desiccant solution storage tank). The heat exchanger is used to exchange heat before the dilute desiccant solution enters the evaporator 2 and before the concentrated desiccant solution returns to the desiccant unit 1, recovering and utilizing the heat of the concentrated desiccant solution to preheat the dilute desiccant solution, thereby reducing the energy consumption of the evaporator 2.

[0047] A dilute solution pump can be installed between the moisture absorption unit 1 and the inlet of the cold side channel of the heat exchanger. The dilute solution pump can pump the dilute desiccant solution to the evaporator 2. A concentrated solution pump can be installed between the evaporator 2 and the inlet of the hot side channel of the heat exchanger. The concentrated solution pump can pump the concentrated desiccant solution to the moisture absorption unit 1.

[0048] Optionally, a dilute desiccant solution storage tank and a concentrated desiccant solution storage tank can be provided between the moisture absorption unit 1 and the evaporator 2. These tanks can be used to store the dilute and concentrated desiccant solutions respectively. Further, the concentrated desiccant solution storage tank can be connected to the outlet of the hot-side channel of the heat exchanger to store the concentrated desiccant solution discharged from the concentrated solution outlet 22 of the evaporator 2 after heat exchange. The concentrated and dilute desiccant solution storage tanks can be connected to the desiccant outlet 14 of the moisture absorption unit 1 to store the dilute desiccant solution discharged from the desiccant outlet 14 of the moisture absorption unit 1 for heating by the heat exchanger.

[0049] Reference Figure 1 The following example illustrates the working process of an air-to-water system.

[0050] Steps S1 to S6 correspond to Figure 1 ① to ⑥ in the text.

[0051] (S1), moisture absorption

[0052] Lithium chloride (LiCl) solution is selected as the desiccant, and the concentration of the concentrated desiccant solution can be set to 40 wt% (mass percentage concentration). Ambient air (25℃, relative humidity 20%) is introduced into the packed tower desiccant unit 1 at a flow rate of 5000 m³ / h. The ambient air comes into countercurrent contact with the 40 wt% lithium chloride solution sprayed from the top of the tower (understandable). Figure 1The positions of air inlet 11 and air outlet 12 are merely illustrative and schematic. In this specific embodiment, air inlet 11 may be located at the bottom or lower part of the packed tower, and air outlet 12 may be located at the top or upper part of the packed tower. After absorbing moisture from the air, the lithium chloride solution concentration drops to approximately 33 wt%, and the solution temperature rises slightly to approximately 28°C.

[0053] (S2) Heating

[0054] A 33wt% dilute lithium chloride solution is pumped through a heat exchanger and exchanges heat with a concentrated solution from evaporator 2 at approximately 70°C. In the heat exchanger, the dilute lithium chloride solution is preheated to approximately 55°C. The preheated solution then enters evaporator 2, where it is heated by high-temperature, high-pressure steam.

[0055] (S3) Dehumidifier solution regeneration

[0056] The dilute lithium chloride solution can be heated by the high-temperature and high-pressure steam discharged from the compressor 3. The absolute pressure inside the evaporator 2 can be maintained at about 23 kPa. Under this pressure, the boiling point of the dilute lithium chloride solution is about 65°C. The dilute lithium chloride solution is evaporated and concentrated to a concentration of 40 wt%, and then pumped by the concentrated solution pump to the heat exchanger for cooling, and returned to the desiccant unit 1 for recycling.

[0057] (S4) Compression

[0058] The 65°C water vapor generated by the evaporation of lithium chloride solution can be drawn into compressor 3, and after being compressed by compressor 3, it becomes high-temperature and high-pressure water vapor, for example, the temperature can be 102°C and the pressure can be 0.12MPa (absolute pressure).

[0059] (S5) Thermal Regeneration

[0060] High-temperature and high-pressure steam is introduced into evaporator 2 to heat the dilute lithium chloride solution, making full use of the latent heat in the steam generated by the evaporation of the lithium chloride solution to reduce overall energy consumption.

[0061] (S6) Condensation

[0062] Water vapor releases its latent heat and condenses into liquid water, which is then discharged and stored through a water production channel.

[0063] The air-to-water system of this application can produce large quantities of pure fresh water under low humidity conditions with low energy consumption.

[0064] Specifically, in the above embodiments, under low humidity conditions of 20% relative humidity, the air-to-water system operated continuously and stably for 24 hours, with a cumulative water production of 1.02 tons. This demonstrates its effectiveness and large-scale water production capacity in arid environments, overcoming the geographical limitations of traditional condensation methods and providing a reliable water supply solution for arid regions. The total power consumption of the air-to-water system over 24 hours is 285 kWh. Calculations show that the energy consumption per ton of water produced is 279 kWh / ton, and the equivalent COP of the air-to-water system is as high as 3.08. This energy consumption is far lower than that of traditional thermal seawater desalination (>600 kWh / ton) and condensation methods under low humidity conditions, significantly reducing operating costs and demonstrating economic feasibility for large-scale application. Data recorded by the conductivity meter shows that the conductivity of the produced condensate is stable between 2.1 and 3.5 μS / cm, with an average value below 3.0 μS / cm. The produced condensate was sampled and sent to a third-party testing facility. The total dissolved solids (TDS) content was 1.8 mg / L, indicating that the water produced by the air-to-water system of this application meets the standards for high-purity water and can directly meet the high-end water needs of drinking, laboratory, and electronic applications, achieving a significant leap in the quality of air-to-water production. The air-to-water system has a compact structure and reliable operation. Adopting a standardized modular design, it can be flexibly combined according to water demand, easily expanding production capacity from several tons to thousands of tons per day, offering extremely high application flexibility. This air-to-water system can still operate efficiently in low-humidity environments, with low energy consumption and pure water quality, making it suitable for arid regions, islands, and industrial high-purity water preparation scenarios. It should be understood that the specific parameters in the above embodiments, examples, or examples are only listed to illustrate the technical effects of this application, and those skilled in the art can adjust them according to actual needs without departing from the scope of protection of this application.

[0065] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0066] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0067] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, 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 communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0069] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A desiccant regeneration air-water intake system based on mechanical vapor recompression, characterized in that, include: The moisture absorption unit (1) includes a gas-liquid contact reaction device. The moisture absorption unit (1) is used to make the desiccant solution and the air fully contact each other for mass and heat transfer. The desiccant solution absorbs moisture from the air and is thus diluted. as well as A mechanical vapor recompression evaporator (100) includes an evaporator (2) and a compressor (3). The evaporator (2) includes a dilute solution inlet (21), a concentrated solution outlet (22), a steam outlet (23), a steam inlet (24), and a condensate outlet (25). The evaporator (2) includes a desiccant channel capable of containing the desiccant solution. The dilute solution inlet (21) and the concentrated solution outlet (22) are connected to the moisture absorption unit (1). The dilute solution inlet (21) is used to receive the diluted desiccant solution, and the concentrated solution outlet (22) is used to pass the evaporated and concentrated desiccant solution to the moisture absorption unit (1). The compressor (3) includes a compressor inlet (31) and a compressor outlet (32). The compressor inlet (31) is connected to the steam outlet (23), and the compressor outlet (32) is connected to the steam inlet (24). The water vapor entering the evaporator (2) from the steam inlet (24) heats the diluted desiccant solution, causing the diluted desiccant solution to evaporate and generate water vapor, which enters the compressor (3) through the steam outlet (23). The water vapor that has heated the diluted desiccant solution condenses to generate liquid water.

2. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The evaporator (2) includes a water production channel, which is an independent and closed channel physically isolated from the desiccant solution inside the evaporator (2). The steam inlet (24) and the condensate outlet (25) are located at the inlet and outlet ends of the water production channel, respectively.

3. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The moisture absorption unit (1) includes a spray tower, a bubble tower, or a packed tower.

4. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 2, characterized in that, A water quality monitoring device (26) is installed at the outlet end of the water production channel to monitor the water quality indicators of the condensate discharged from the condensate outlet (25) in real time.

5. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 2, characterized in that, Both the water production channel and the desiccant channel are made of materials resistant to halogen corrosion.

6. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 2, characterized in that, Both the water production channel and the desiccant channel are made of stainless steel.

7. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The air-water intake system includes a heat exchanger disposed between the moisture absorption unit (1) and the evaporator (2). The heat exchanger includes a cold-side channel and a hot-side channel. The inlet of the cold side channel of the heat exchanger is connected to the desiccant outlet (14) of the moisture absorption unit (1), the outlet of the cold side channel of the heat exchanger is connected to the dilute solution inlet (21) of the evaporator (2), the inlet of the hot side channel of the heat exchanger is connected to the concentrated solution outlet (22) of the evaporator (2), and the outlet of the hot side channel of the heat exchanger is connected to the desiccant inlet (13) of the moisture absorption unit (1) or the desiccant storage tank, so that the diluted desiccant solution is preheated through the heat exchanger.

8. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The compressor (3) is a multi-stage compressor, which includes a Roots compressor and a centrifugal compressor connected in sequence, or a combination of at least two of the centrifugal compressor, Roots compressor and screw compressor.

9. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The moisture absorption unit (1) is provided with an air inlet (11) and a desiccant inlet (13). The desiccant inlet (13) is located at the top or upper part of the moisture absorption unit (1), and the air inlet (11) is located at the bottom or lower part of the moisture absorption unit (1). Inside the moisture absorption unit (1), the air and the desiccant solution come into countercurrent contact.

10. The desiccant regeneration air-water intake system based on mechanical vapor recompression according to claim 1, characterized in that, The desiccant solution is a hygroscopic salt solution, and the hygroscopic salt includes at least one of the following: calcium chloride, lithium chloride, calcium bromide, lithium bromide, magnesium chloride, phosphorus trichloride, phosphorus pentachloride, magnesium perchlorate, sodium hydroxide, potassium hydroxide, calcium nitrate, magnesium nitrate, potassium acetate, disodium hydrogen phosphate, and sodium sulfate.

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