A method for electrostatic water extraction from flue gas or cooling tower exhaust and a water extraction device therefor

Abstract

A method for electrostatically extracting water from flue gas or cooling tower exhaust and a water extraction device thereof, the method comprising: atomizing a desiccant solution into desiccant droplets, carrying the desiccant droplets with airflow to mix with the flue gas or cooling tower exhaust, the desiccant droplets absorbing water vapor in the exhaust, then charging the saturated desiccant droplets and mist droplets under the action of corona discharge, capturing the charged droplets by a grounded collecting electrode under the action of an electric field force, and discharging the flue gas or cooling tower exhaust treated by electrostatic mist capture and water extraction into the atmosphere, capturing the mist droplets and desiccant droplets mixing on the surface of the collecting electrode, further diluting the desiccant solution, and regenerating and recycling the diluted desiccant solution after releasing water vapor through a desorption process, and collecting the released water vapor through a condensation method; the water extraction device is used to implement a method for electrostatically extracting water from flue gas or cooling tower exhaust; the present invention solves the problem of water resource loss caused by flue gas emission or cooling tower operation.

Description

Technical Field

[0001] The invention belongs to the technical field of water saving, and in particular relates to a method for electrostatically extracting water from flue gas or cooling tower exhaust and a water extraction device thereof. Background Art

[0002] The flue gas generated by thermal power generation, biomass or waste power generation, solid waste treatment and other processes contains a large amount of liquid droplets and water vapor. The liquid droplets often contain a variety of salts and pollutants. Direct discharge will cause pollution to the atmospheric environment. After the water vapor is discharged into the atmosphere, it will promote the formation of condensable particulate matter, which will pollute the atmospheric environment and increase water loss.

[0003] Existing flue gas purification systems generally use an inertial interception mechanism to capture droplets, which is characterized by low capture efficiency for micron-sized droplets, and the mist capture process brings significant resistance to the airflow, increasing the energy consumption of the fan. In order to recover water vapor, the industry often adopts a solution that combines a condenser with a flue gas purification system. However, the presence of dust that is not completely removed in the flue gas leads to serious dust accumulation and scaling problems in the condenser, which in turn affects the heat transfer efficiency between the flue gas and the condenser. In addition, the condenser needs to be used in conjunction with a cooling tower, and the operation of the cooling tower often discharges water vapor into the atmosphere, resulting in water loss. In order to recover water vapor in the flue gas, a few industrial processes use a liquid desiccant atomization method to absorb water vapor in the flue gas, but this solution has the problem of atomized desiccant droplets escaping from the outlet of the absorption equipment.

[0004] Therefore, the industry urgently needs more efficient recovery technologies for liquid droplets and water vapor in flue gas. Developing technologies to recover moisture from flue gas or cooling tower exhaust is of great significance.

[0005] Patent application number [CN202110456078.4] discloses a flue gas water extraction device arranged in the flue duct at the outlet of a wet flue gas desulfurization tower. The device comprises a gas-liquid heat exchanger and a water storage tank. The gas-liquid heat exchanger is arranged in the flue duct at the outlet of the desulfurization tower. The cold side of the gas-liquid heat exchanger is connected to a circulating water heat exchanger. The inlet of the water storage tank is connected to the flue duct at the outlet of the desulfurization tower. After heat exchange in the gas-liquid heat exchanger, the saturated flue gas condenses and releases some condensed water into the water storage tank. This device captures water vapor solely based on the condensation principle, resulting in a flue gas cooling effect of only 3-5°C. The amount of water vapor condensed is limited, and the circulation of the circulating water in the gas-liquid heat exchanger requires a pump to power the circulation water, requiring an additional heat exchanger for cooling the circulating water. Furthermore, this device cannot capture suspended droplets in the flue gas. Therefore, the device has low efficiency in capturing water resources in the flue gas, and the energy consumption and complexity of the water extraction system are high. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an electrostatic water extraction method and water extraction device from flue gas or cooling tower exhaust, which utilizes the ion wind caused by corona discharge to enhance the moisture absorption and condensation process of water vapor, and utilizes the electric field to enhance the capture of droplets in the airflow and inhibit the escape of desiccant droplets, thereby achieving the coordinated capture of droplets and water vapor in the airflow. The device is coupled with a photovoltaic power generation system, and the electrical energy and thermal energy generated by photovoltaic power generation are used for corona discharge and regeneration of desiccant, thereby alleviating the environmental pollution and water resource loss problems caused by flue gas emissions or cooling tower operation.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A method for electrostatically extracting water from flue gas or cooling tower exhaust gas comprises the following steps: atomizing a desiccant solution into desiccant droplets 17 with a diameter of 1-20 microns; carrying the desiccant droplets 17 with an airflow 16 to form an airflow loaded with the desiccant droplets; mixing the airflow loaded with the desiccant droplets with the flue gas or cooling tower exhaust gas 18; and then the desiccant droplets 17 absorb water vapor in the flue gas or cooling tower exhaust gas 18; then the saturated desiccant droplets 17 and the mist droplets 19 contained in the flue gas or cooling tower exhaust gas 18 are charged under the action of corona discharge; the charged desiccant droplets 17 and the mist droplets 19 are captured by a grounded collecting electrode 15 under the action of the electric field force; the flue gas or cooling tower exhaust gas 10 treated by electrostatic mist capture and water extraction is discharged into the atmosphere; the captured mist droplets 19 and the desiccant droplets 17 are mixed on the surface of the collecting electrode 15, so that the desiccant solution is further diluted; the diluted desiccant solution releases water vapor through a desorption process, and the released water vapor is collected by a condensation method.

[0009] The flue gas or cooling tower exhaust 18 exchanges heat with the atmospheric environment through the collecting electrode 15, so that the water vapor in the flue gas or cooling tower exhaust 18 is condensed, and the ion wind generated by the corona discharge of the discharge electrode 14 strengthens the condensation process of the water vapor.

[0010] The heat required for the desorption process of the desiccant solution is provided by a photovoltaic power generation cooling water circulation system.

[0011] The desiccant solution is a CaCl2 solution with a mass concentration of 30%-60%. The desiccant solution can also be a LiCl solution with a mass concentration of 30%-60% or a LiBr solution with a mass concentration of 30%-60%.

[0012] The present invention also provides an electrostatic water extraction device from flue gas or cooling tower exhaust, comprising a desiccant atomizer 1, the mist outlet of the desiccant atomizer 1 being connected to the hygroscopic mist inlet of the electrostatic mist capture water extraction device 2, the liquid discharge outlet of the electrostatic mist capture water extraction device 2 being connected to the liquid phase inlet of the desiccant regenerator 8, the liquid phase outlet of the desiccant regenerator 8 being connected to the liquid inlet of the desiccant atomizer 1 to form a circulation loop; the gas phase outlet of the desiccant regenerator 8 being connected to the water vapor inlet of the condenser 6, the condensed water outlet of the condenser 6 being connected to the water inlet of the condensed water tank 9.

[0013] The heat required by the desiccant regenerator 8 is provided by the photovoltaic power generation cooling water circulation system.

[0014] The photovoltaic power generation cooling water circulation system includes a photovoltaic panel 3. The water cooling system arranged on the back of the photovoltaic panel 3 is connected to the cooling water inlet of the heat reservoir 5 through a cooling water circulation pump 4. The waste heat generated by photovoltaic power generation is transferred to the heat reservoir 5 through cooling water. After the cooling water releases heat inside the heat reservoir 5, it flows out from the cooling water outlet of the heat reservoir 5 and then enters the water cooling system on the back of the photovoltaic panel 3 again to form a loop. The heat reservoir 5 is connected to the desiccant regenerator 8 via a water circulation pipeline, and the heat stored in the heat reservoir 5 is transferred to the desiccant regenerator 8 through circulating water for desiccant regeneration.

[0015] The liquid phase outlet of the desiccant regenerator 8 is connected to the liquid supply port of the desiccant atomizer 1 through the desiccant circulation pump 7 .

[0016] The exhaust port of the electrostatic mist capture and water extraction device 2 is connected to the ambient air 20 , and the air inlet of the electrostatic mist capture and water extraction device 2 is connected to the flue gas or the cooling tower exhaust 18 .

[0017] The electrostatic mist capture and water extraction device 2 includes a shell 21, and collecting electrodes 15 are respectively arranged on the inner wall and inside of the shell to form multiple groups of air flow channels. The bottom of the internal air flow channel is provided with a baffle 22 at intervals. The air flow channel with the baffle 22 forms an air circulation channel, and the air flow channel without the baffle 22 is an industrial exhaust channel. The air circulation channel and the industrial exhaust channel are arranged at intervals. The center of the industrial exhaust channel is respectively provided with a repelling electrode 13 and a discharge electrode 14, and the repelling electrode 13 is located above the discharge electrode 14, wherein the discharge electrode 14 and the repelling electrode 13 are connected to high voltage, and the collecting electrode 15 is grounded; the discharge electrode 14 generates corona discharge to charge the droplets 19 in the flue gas or cooling tower exhaust 18, and generates ion wind to enhance the absorption and condensation process of water vapor; the repelling electrode 13 does not generate corona discharge, and strengthens the capture of droplets and suppresses the escape of desiccant droplets 17 by regulating the electric field; the discharge electrode 14 is provided in the center of the air circulation channel, which is used to generate ion wind to enhance the convective heat exchange between the air and the outside of the collecting electrode 15, thereby enhancing the condensation of water vapor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention configures a repelling electrode 13, a discharge electrode 14, and a collecting electrode 15 in an electrostatic mist capture and water extraction device 2, so that flue gas or cooling tower exhaust 18 can capture droplets, condense, and absorb water vapor in an electric field. Corona discharge and an electric field are used to regulate the migration behavior of droplets so that they can be efficiently captured. The ion wind caused by corona discharge is used to enhance the condensation and absorption of water vapor, thereby achieving efficient water recovery and significantly reducing the water replenishment cost of the industrial process.

[0020] 2. The energy consumption required for the operation of the present invention mainly includes the energy consumption of circulating and transporting fluids such as cooling water and desiccant, the energy consumption of ultrasonic atomization of the desiccant, and the energy consumption of corona discharge inside the electrostatic mist capture and water extraction device 2. Among them, ultrasonic atomization and corona discharge have the advantage of low energy consumption.

[0021] 3. The corona discharge method in this invention charges the desiccant droplets 17, allowing them to be efficiently captured under the action of the electric field. This solves the problem of desiccant droplets 17 escaping in traditional atomization desiccant absorption methods. Furthermore, the condensation process is coupled with the desiccant absorption process to capture water vapor. The ionic wind generated by the corona discharge enhances heat and mass transfer within the gas phase, thereby strengthening the condensation and absorption of water vapor. The synergistic desiccant and condensation methods for recovering water vapor improve water vapor recovery efficiency.

[0022] 4. The fine particles contained in the exhaust gas inside the device of the present invention are transformed into larger droplets containing particles during the condensation process of water vapor, which are more easily captured by electrostatics. Therefore, the device can synergistically remove fine particles.

[0023] 5. The heat required for regeneration of the desiccant solution of the present invention and the electric energy for system operation are provided by the photovoltaic power generation cooling water circulation system, and no carbon emissions are generated.

[0024] 6. The integrated water cooling system on the back of the photovoltaic panel 3 of the present invention is used to reduce the temperature of the photovoltaic panel 3 and improve the efficiency of photovoltaic power generation. At the same time, the heat reservoir 5 in the photovoltaic power generation cooling water circulation system stores the excess photovoltaic power generated during the day, providing continuous heat for the desiccant regenerator 8.

[0025] 7. The water vapor generated by the desiccant regenerator 8 of the present invention is condensed by the air-cooled condenser 6 and then enters the condensed water tank 9, thereby achieving energy-saving water extraction and reducing water loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the device of the present invention.

[0027] Figure 2 It is a structural schematic diagram of an electrostatic demisting and water-taking device 2 of the present invention.

[0028] Among them: 1: Desiccant atomizer; 2: Electrostatic mist capture and water extraction device; 3: Photovoltaic panel; 4: Cooling water circulation pump; 5: Heat storage device; 6: Condenser; 7: Desiccant circulation pump; 8: Desiccant regenerator; 9: Condensate tank; 10: Flue gas or cooling tower exhaust after electrostatic mist capture and water extraction treatment; 11: Water vapor pipeline; 12: Condensate pipeline; 13: Repulsion electrode; 14: Discharge electrode; 15: Collecting electrode; 16: Air flow; 17: Desiccant droplets; 18: Flue gas or cooling tower exhaust; 19: Mist droplets; 20: Ambient air; 21: Shell; 22: Baffle. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts should fall within the scope of protection of the present invention.

[0030] A method for electrostatically extracting water from flue gas or cooling tower exhaust gas, wherein a desiccant solution is atomized into desiccant droplets 17 with a diameter of 1-20 microns, and an air flow 16 is used to carry the desiccant droplets 17 to form an air flow carrying the desiccant droplets. After the air flow carrying the desiccant droplets is mixed with the flue gas or cooling tower exhaust gas 18, the desiccant droplets 17 absorb water vapor in the flue gas or cooling tower exhaust gas 18, and then the saturated desiccant droplets 17 and the mist droplets 19 contained in the flue gas or cooling tower exhaust gas 18 are discharged by the corona discharge. The charged desiccant droplets 17 and mist droplets 19 are captured by the grounded collecting electrode 15 under the action of the electric field force. The flue gas or cooling tower exhaust 10 after electrostatic mist capture and water treatment is discharged into the atmospheric environment. The captured mist droplets 19 and desiccant droplets 17 are mixed on the surface of the collecting electrode 15, so that the desiccant solution is further diluted. The diluted desiccant solution releases water vapor through the desorption process and is regenerated and recycled. The released water vapor is collected by condensation.

[0031] The flue gas or cooling tower exhaust 18 exchanges heat with the atmospheric environment through the collecting electrode 15, so that the water vapor in the flue gas or cooling tower exhaust 18 is condensed, and the ion wind generated by the corona discharge of the discharge electrode 14 strengthens the condensation process of the water vapor.

[0032] After the airflow carrying the desiccant droplets is mixed with the flue gas or the exhaust gas 18 from the cooling tower, the gas phase and the desiccant droplets 17 undergo heat and moisture transfer, thereby achieving the absorption of water vapor.

[0033] The flue gas or cooling tower exhaust 18 is freed of liquid droplets and water vapor and then discharged into the ambient air 20 .

[0034] The heat required for the desorption process of the desiccant solution is provided by a photovoltaic power generation cooling water circulation system.

[0035] The desiccant solution is a CaCl2 solution with a mass concentration of 30%-60%. The desiccant solution can also be a LiCl solution with a mass concentration of 30%-60% or a LiBr solution with a mass concentration of 30%-60%.

[0036] like Figure 1 As shown, the present invention also provides an electrostatic water extraction device from flue gas or cooling tower exhaust, including a desiccant atomizer 1, the mist outlet of the desiccant atomizer 1 is connected to the hygroscopic mist inlet of the electrostatic mist capture water extraction device 2, the liquid discharge port of the electrostatic mist capture water extraction device 2 is connected to the liquid phase inlet of the desiccant regenerator 8, the liquid phase outlet of the desiccant regenerator 8 is connected to the liquid inlet of the desiccant atomizer 1, forming a circulation loop; the gas phase outlet of the desiccant regenerator 8 is connected to the water vapor inlet of the condenser 6, and the condensed water outlet of the condenser 6 is connected to the water inlet of the condensed water tank 9.

[0037] Corona discharge occurs in the electrostatic mist capture and water extraction device 2 and an electric field exists. The droplets are charged by the corona discharge, and the charged droplets are further captured under the action of the electric field force.

[0038] The corona discharge in the electrostatic mist capture and water extraction device 2 generates ion wind, which strengthens the condensation and absorption process of water vapor.

[0039] The desiccant regenerator 8 is heated by the heat storage 5 , and the generated water vapor forms condensed water in the condenser 6 .

[0040] The heat required by the desiccant regenerator 8 is provided by the photovoltaic power generation cooling water circulation system.

[0041] The photovoltaic power generation cooling water circulation system includes a photovoltaic panel 3. The water cooling system arranged on the back of the photovoltaic panel 3 is connected to the cooling water inlet of the heat reservoir 5 through a cooling water circulation pump 4. The waste heat generated by photovoltaic power generation is transferred to the heat reservoir 5 through cooling water. After the cooling water releases heat inside the heat reservoir 5, it flows out from the cooling water outlet of the heat reservoir 5 and then enters the water cooling system on the back of the photovoltaic panel 3 again to form a loop. The heat reservoir 5 is connected to the desiccant regenerator 8 via a water circulation pipeline, and the heat stored in the heat reservoir 5 is transferred to the desiccant regenerator 8 through circulating water for desiccant regeneration.

[0042] The electricity generated by the photovoltaic panel 3 is used to provide energy for fluid transportation and corona discharge of the electrostatic mist capture and water extraction device 2 .

[0043] The liquid phase outlet of the desiccant regenerator 8 is connected to the liquid supply port of the desiccant atomizer 1 through the desiccant circulation pump 7 .

[0044] The exhaust port of the electrostatic mist capture and water extraction device 2 is connected to the ambient air 20 , and the air inlet of the electrostatic mist capture and water extraction device 2 is connected to the flue gas or the cooling tower exhaust 18 .

[0045] like Figure 2 As shown, the electrostatic mist capture and water extraction device 2 includes a shell 21, and the inner wall of the shell 21 and the interior of the shell are respectively provided with collecting electrodes 15 to form multiple groups of air flow channels. The bottom of the internal air flow channel is provided with a baffle 22 at intervals. The air flow channel with the baffle 22 forms an air circulation channel, and the air flow channel without the baffle 22 is an industrial exhaust channel. The air circulation channel and the industrial exhaust channel are arranged at intervals. That is, the industrial mist and air channels are arranged in an intermittent manner, and a repelling electrode 13 and a discharge electrode 14 are respectively arranged at the center of the industrial exhaust channel, and the repelling electrode 13 is located above the discharge electrode 14, wherein the discharge electrode 14 and the repelling electrode 13 are connected to high voltage, and the collecting electrode 15 is grounded; the discharge electrode 14 generates corona discharge to charge the droplets 19 in the flue gas or cooling tower exhaust 18, and generates ion wind to enhance the absorption and condensation process of water vapor; the repelling electrode 13 does not generate corona discharge, and strengthens the capture of droplets and suppresses the escape of desiccant droplets 17 by regulating the electric field; only the discharge electrode 14 is provided in the center of the air circulation channel, which is used to generate ion wind to enhance the convective heat exchange between the air and the outside of the collecting electrode 15, thereby enhancing the condensation of water vapor.

[0046] One side of the collecting electrode 15 is in contact with the flue gas or cooling tower exhaust 18, and the other side is in contact with the ambient air 20. The high-temperature flue gas or cooling tower exhaust and the normal-temperature air exchange heat through the collecting electrode 15, and the water vapor in the flue gas or cooling tower exhaust 18 will condense on the surface of the collecting electrode 15. By arranging discharge electrodes 14 on both sides of the collecting electrode 15, namely the normal-temperature air side and the high-temperature exhaust side, there is an ion wind generated by the corona discharge process at both ends of the collecting electrode 15, which can not only enhance the convective heat exchange between the air and the collecting electrode 15, but also enhance the heat and mass transfer process from the flue gas or cooling tower exhaust 18 to the surface of the collecting electrode 15, thereby enhancing the water vapor condensation process.

[0047] The airflow in the electrostatic mist capture and water extraction device 2 exchanges heat with the ambient air 20 through the collecting electrode 15, thereby achieving condensation of water vapor.

[0048] Example

[0049] like Figure 1As shown, the present invention provides a method for electrostatically extracting water from flue gas or cooling tower exhaust gas, which utilizes corona discharge and ion wind to enhance the droplet capture and water vapor absorption and condensation process in an electric field environment, and efficiently recovers moisture in the airflow. The device of the present invention is installed at the end of the flue gas purification system. The desiccant atomizer 1 atomizes the desiccant solution (such as CaCl2 solution) into desiccant droplets 17 with a diameter of about 10 microns. The airflow 16 carries the desiccant droplets 17 into the electrostatic mist capture water extraction device 2 and mixes with the flue gas. The desiccant droplets 17 absorb water vapor in the flue gas, and then the desiccant droplets 17 are charged under the action of corona discharge and further captured by the grounded collecting electrode 15 in the electric field. The droplets contained in the flue gas itself are also charged under the action of corona discharge and the electric field and then captured by the collecting electrode 15. At the same time, the flue gas exchanges heat with the air outside it through the collecting electrode 15, so that the water vapor in the flue gas condenses on the surface of the collecting electrode 15. The above process can realize the capture of mist droplets and water vapor in the flue gas. The flue gas or cooling tower exhaust 10 after electrostatic mist capture and water extraction treatment flows into the atmospheric environment from the outlet of the electrostatic mist capture and water extraction device 2. The mist droplets and condensed water captured by the collecting electrode 15 in the electrostatic mist removal and water extraction device 2 are mixed with the desiccant droplets 17 to form a low concentration desiccant solution, which then enters the desiccant regenerator 8, releases water vapor through the desorption process, forms a concentrated desiccant solution, and returns to the desiccant atomizer 1 via the desiccant circulation pump 7.

[0050] The water vapor generated by the desiccant regenerator 8 enters the condenser 6 via the water vapor pipeline 11, where it condenses into water. The water vapor then enters the condensed water tank 9 via the condensed water pipeline 12. The heat required by the desiccant regenerator 8 is provided by the heat reservoir 5, which itself draws its internal heat from the waste heat generated by the photovoltaic panels 3. The photovoltaic panels 3 and the heat reservoir 5 exchange heat via a water cooling system. Cooling water absorbs heat as it flows across the back of the photovoltaic panels 3, then enters the heat reservoir 5 through the water circulation pipeline, releasing the heat, thus transferring heat from the photovoltaic panels 3 to the heat reservoir 5.

[0051] like Figure 2As shown, when the voltage connected to the discharge electrode 14 is within the appropriate range, corona discharge occurs, generating an ion wind. Although the repelling electrode 13 is connected to a high voltage, it does not generate corona discharge and is only used to regulate the electric field distribution within the device. The airflow 16 containing desiccant droplets 17 mixes with the flue gas or cooling tower exhaust 18 within the electrostatic demisting and water extraction device 2. The desiccant droplets 17 and the mist droplets 19 contained in the flue gas or cooling tower exhaust 18 become charged as they migrate to the area near the discharge electrode 14. Subsequently, under the influence of the electric field force, they migrate to the collecting electrode 15 and are captured. The desiccant droplets 17 absorb water vapor from the airflow 16 as they migrate within the device. In addition, the flue gas or cooling tower exhaust 18 mixes with the airflow 16 and exchanges heat with the air through the collecting electrode 15, thereby condensing the water vapor in the airflow 16. The ion wind generated by the corona discharge exists on both sides of the collecting electrode 15, which enhances the condensation process of the water vapor.

[0052] Figure 2 The figure shows a schematic diagram of an electrostatic mist removal and water extraction device 2. The device 2 primarily consists of a housing 21 and three electrodes: a repelling electrode 13, a discharge electrode 14, and a collecting electrode 15. Both the repelling electrode 13 and the discharge electrode 14 are linear, while the collecting electrode 15 is plate-shaped. Multiple collecting electrodes 15 are arranged in parallel, forming multiple airflow channels. Baffles 22 are intermittently positioned at the bottom of the airflow channels. Airflow channels equipped with baffles 22 function as air circulation channels, while those without baffles 22 function as industrial exhaust channels. The airflow channels and industrial exhaust channels are arranged alternately. The linear repelling electrode 13 and the discharge electrode 14, both connected to high voltage, are positioned at the center of the airflow channel. At the center of the industrial exhaust channel, the repelling electrode 13 is positioned above the discharge electrode 14. Both the repelling electrode 13 and the discharge electrode 14 are connected to high voltage, but the diameter of the repelling electrode 13 is larger than that of the discharge electrode 14. Therefore, under appropriate voltage conditions, the repelling electrode 13 does not discharge while the discharge electrode 14 does. The collecting electrode 15 is grounded and can work together with the discharge electrode 14 and the repelling electrode 13 to provide an electric field. The discharge electrode 14 generates a corona discharge, which can generate an ion wind and charge the droplets in the airflow at the same time. The charged droplets then migrate toward the collecting electrode 15 under the enhanced electric field provided by the repelling electrode 13 and are captured. At the same time, the ion wind generated by the corona discharge can enhance the heat and mass transfer within the gas phase by disturbing the airflow, thereby enhancing the condensation and absorption of water vapor. Only the discharge electrode 14 is provided in the air circulation channel. The function of the discharge electrode 14 is to enhance the convective heat exchange between the air and the outer surface of the collecting electrode 15, and it can also enhance the condensation of water vapor.

[0053] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, several simple replacements can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of patent protection of the present invention determined by the submitted claims.

Claims

1. A method for electrostatically extracting water from flue gas or cooling tower exhaust, characterized by: The desiccant solution is atomized into desiccant droplets (17) with a diameter of 1-20 microns, and the desiccant droplets (17) are loaded by an airflow (16) to form an airflow loaded with the desiccant droplets. After the airflow loaded with the desiccant droplets is mixed with flue gas or cooling tower exhaust gas (18) in an electrostatic mist capture and water-taking device (2), the desiccant droplets (17) absorb water vapor in the flue gas or cooling tower exhaust gas (18), and then the saturated desiccant droplets (17) and the mist droplets (19) contained in the flue gas or cooling tower exhaust gas (18) are saturated. The charged desiccant droplets (17) and mist droplets (19) are captured by the grounded collecting electrode (15) under the action of the electric field force, and the flue gas or cooling tower exhaust gas (18) after the electrostatic mist capture water treatment is discharged into the atmosphere. The captured mist droplets (19) and desiccant droplets (17) are mixed on the surface of the collecting electrode (15), so that the desiccant solution is further diluted. The diluted desiccant solution releases water vapor through the desorption process, and the released water vapor is collected by condensation. The exhaust port of the electrostatic mist capture and water extraction device (2) is connected to the ambient air (20), and the air inlet of the electrostatic mist capture and water extraction device (2) is connected to the flue gas or the cooling tower exhaust (18); The electrostatic mist capture and water extraction device (2) comprises a shell (21), wherein the inner wall of the shell (21) and the interior of the shell are respectively provided with collecting electrodes (15), wherein one side of the collecting electrode (15) contacts the flue gas or the exhaust gas of the cooling tower (18), and the other side contacts the ambient air (20), thereby forming a plurality of air flow channels, wherein the bottom of the internal air flow channel is provided with a baffle (22) at intervals, wherein the air flow channel provided with the baffle (22) forms an air circulation channel, and the air flow channel without the baffle (22) is an industrial exhaust channel, wherein the air circulation channel and the industrial exhaust channel are arranged at intervals, and a repelling electrode (13) and a discharge electrode (14) are respectively provided at the center of the industrial exhaust channel, wherein the repelling electrode (13) and the discharge electrode (14) are ... The electrode (13) is located above the discharge electrode (14), wherein the discharge electrode (14) and the repelling electrode (13) are connected to a high voltage, and the collecting electrode (15) is grounded; the discharge electrode (14) generates corona discharge to charge the mist droplets (19) in the flue gas or the cooling tower exhaust (18), and generates ion wind to enhance the absorption and condensation process of water vapor; the repelling electrode (13) does not generate corona discharge, and strengthens the capture of mist droplets and inhibits the escape of desiccant droplets (17) by regulating the electric field; the discharge electrode (14) is provided in the center of the air circulation channel for generating ion wind to enhance the convective heat exchange between the ambient air (20) and the outside of the collecting electrode (15), thereby enhancing the condensation of water vapor.

2. The method for electrostatically extracting water from flue gas or cooling tower exhaust according to claim 1, characterized in that: The flue gas or cooling tower exhaust (18) exchanges heat with the atmospheric environment through the collecting electrode (15), so that water vapor in the flue gas or cooling tower exhaust (18) is condensed, and the ion wind generated by the corona discharge of the discharge electrode (14) strengthens the condensation process of the water vapor.

3. The method for electrostatically extracting water from flue gas or cooling tower exhaust according to claim 1, characterized in that: The heat required for the desorption process of the desiccant solution is provided by a photovoltaic power generation cooling water circulation system.

4. The method for electrostatically extracting water from flue gas or cooling tower exhaust according to claim 1, characterized in that: The desiccant solution is a CaCl2 solution with a mass concentration of 30%-60% or a LiCl solution with a mass concentration of 30%-60% or a LiBr solution with a mass concentration of 30%-60%.

5. A device for implementing the water extraction method according to any one of claims 1 to 4, characterized in that: The invention comprises a desiccant atomizer (1), wherein the mist outlet of the desiccant atomizer (1) is connected to the desiccant mist inlet of the electrostatic mist capture and water-taking device (2), the liquid discharge port of the electrostatic mist capture and water-taking device (2) is connected to the liquid phase inlet of the desiccant regenerator (8), the liquid phase outlet of the desiccant regenerator (8) is connected to the liquid inlet of the desiccant atomizer (1), thereby forming a circulation loop; the gas phase outlet of the desiccant regenerator (8) is connected to the water vapor inlet of the condenser (6), and the condensed water outlet of the condenser (6) is connected to the water inlet of the condensed water tank (9); The exhaust port of the electrostatic mist capture and water extraction device (2) is connected to the ambient air (20), and the air inlet of the electrostatic mist capture and water extraction device (2) is connected to the flue gas or the cooling tower exhaust (18); The electrostatic mist capture and water extraction device (2) comprises a shell (21), wherein the inner wall of the shell (21) and the interior of the shell are respectively provided with collecting electrodes (15), wherein one side of the collecting electrode (15) contacts the flue gas or the exhaust gas of the cooling tower (18), and the other side contacts the ambient air (20), thereby forming a plurality of air flow channels, wherein the bottom of the internal air flow channel is provided with a baffle (22) at intervals, wherein the air flow channel provided with the baffle (22) forms an air circulation channel, and the air flow channel without the baffle (22) is an industrial exhaust channel, wherein the air circulation channel and the industrial exhaust channel are arranged at intervals, and a repelling electrode (13) and a discharge electrode (14) are respectively provided at the center of the industrial exhaust channel, wherein the repelling electrode (13) and the discharge electrode (14) are ... The electrode (13) is located above the discharge electrode (14), wherein the discharge electrode (14) and the repelling electrode (13) are connected to a high voltage, and the collecting electrode (15) is grounded; the discharge electrode (14) generates corona discharge to charge the mist droplets (19) in the flue gas or the cooling tower exhaust (18), and generates ion wind to enhance the absorption and condensation process of water vapor; the repelling electrode (13) does not generate corona discharge, and strengthens the capture of mist droplets and inhibits the escape of desiccant droplets (17) by regulating the electric field; the discharge electrode (14) is provided in the center of the air circulation channel for generating ion wind to enhance the convective heat exchange between the ambient air (20) and the outside of the collecting electrode (15), thereby enhancing the condensation of water vapor.

6. The device for the water extraction method according to claim 5, characterized in that: The heat required by the desiccant regenerator (8) is provided by the photovoltaic power generation cooling water circulation system.

7. The device for the water extraction method according to claim 6, characterized in that: The photovoltaic power generation cooling water circulation system comprises a photovoltaic panel (3). A water cooling system arranged on the back of the photovoltaic panel (3) is connected to the cooling water inlet of the heat reservoir (5) through a cooling water circulation pump (4). The waste heat generated by photovoltaic power generation is transferred to the heat reservoir (5) through the cooling water. After the cooling water releases heat inside the heat reservoir (5), it flows out from the cooling water outlet of the heat reservoir (5) and then re-enters the water cooling system on the back of the photovoltaic panel (3), forming a loop. The heat reservoir (5) is connected to the desiccant regenerator (8) via a water circulation pipeline, and the heat stored in the heat reservoir (5) is transferred to the desiccant regenerator (8) through the circulating water to regenerate the desiccant.

8. The device for the water extraction method according to claim 5, characterized in that: The liquid phase outlet of the desiccant regenerator (8) is connected to the liquid supply port of the desiccant atomizer (1) through the desiccant circulation pump (7).

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