Cooling tower fog drop trapping device and method based on corona discharge

Abstract

The invention discloses a cooling tower fog drop trapping device and method based on corona discharge, belongs to the field of manufacturing and application of electric trapping devices, and aims to achieve the purposes of efficiently trapping fog drops and recycling water mist of a cooling tower of a thermal power plant in an energy-saving manner, an insulating shell is formed into a cavity with a narrow upper part and a wide lower part, and an opening of the cavity is formed in an upper shell; the trapping net is arranged in the cavity close to the opening; the atomizing device is arranged at the lower part in the cavity to form mist; the needle electrode is arranged in the cavity between the trapping net and the atomization device; and the water storage area is arranged at the bottom of the cavity, so that the fogdrop trapping area of the trapping net is increased, and the trapping efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of manufacturing and application of electrostatic capture devices, specifically relating to a corona discharge device and a mist capture device for cooling towers and their applications. Background Technology

[0002] Fog, as a novel alternative water source, whether naturally formed dense fog or water mist generated during industrial production, has become an important measure for alleviating water resource pressure through its capture and utilization. Currently, the mainstream fog droplet capture technologies are mesh capture and biomimetic capture. Mesh capture devices mainly consist of a two-dimensional capture plane and support rods on both sides. When air flows through the capture plane, tiny droplets carried in the air collide with the capture net, thus adhering to it. As the number of adhering droplets gradually increases, the droplets grow larger and eventually drip into a specific container under the influence of gravity, completing the droplet collection process. However, the two-dimensional mesh is subject to two constraints: large meshes cannot capture smaller fog droplets, and small meshes can cause blockages, affecting aerodynamics. This leads to problems of mesh clogging and re-entrainment, making mesh capture technology inefficient. Many plants and animals in nature have evolved unique water-collecting abilities to adapt to arid environments. For example, a beetle in the Namib Desert has hydrophilic protrusions on its hydrophobic back. Water droplets in the air gather on these protrusions and, after growing and detaching, flow down the hydrophobic back into the beetle's mouth. Biomimetic trapping devices are inspired by nature, using biomimetic materials with both hydrophilic and hydrophobic properties to capture fog droplets. However, the fabrication processes for most biomimetic materials are currently relatively complex, costly, and have poor durability, which limits their large-scale production and widespread application. Therefore, while existing fog droplet trapping technologies can capture fog droplets, they suffer from low trapping efficiency, high cost, and difficulty in widespread adoption, failing to meet the needs of actual industrial production. Summary of the Invention

[0003] To address the aforementioned problems and achieve efficient and energy-saving collection of mist droplets, thereby recovering water mist from power plant cooling towers, in a first aspect, a cooling tower mist droplet collection device based on corona discharge, according to some embodiments of this application, includes...

[0004] An insulating shell, wherein the insulating shell is formed into a cavity that is narrow at the top and wide at the bottom, and the upper shell forms the opening of the cavity;

[0005] A trapping net, wherein the trapping net is disposed in the cavity near the opening;

[0006] An atomizing device is disposed in the lower part of the cavity to form a mist;

[0007] A needle-shaped electrode is disposed in the cavity between the collecting net and the atomizing device;

[0008] A water storage area is located at the bottom of the cavity.

[0009] According to some embodiments of the cooling tower droplet collection device based on corona discharge in this application, the distance between the needle electrode and the collection net is 2-3 cm.

[0010] According to some embodiments of the present application, the cooling tower droplet collection device based on corona discharge is a flat collection net, a concave collection net, or a convex collection net.

[0011] According to some embodiments of the present application, the cooling tower mist collection device based on corona discharge is provided, wherein the collection net is woven from copper wire with a diameter of 5 mm, the spacing between adjacent copper wires is 3.73 mm, and the shading coefficient is 0.22.

[0012] According to some embodiments of the cooling tower droplet collection device based on corona discharge in this application, the negative terminal of the high-voltage power supply is connected to the needle electrode and supplies power, and the collection net is grounded. The high-voltage power supply outputs a current of 1mA and an output voltage of 0-10kV.

[0013] According to some embodiments of the present application, a cooling tower mist collection device based on corona discharge is provided with an air inlet in the insulating housing;

[0014] The atomizing device includes

[0015] A filling zone is provided in the cavity, wherein the filling material is present.

[0016] A spraying device is installed above the packing area and sprays hot water onto the packing area;

[0017] The air inlet is located on the housing corresponding to the filling area, and the air inlet supplies gas to the filling area. The sprayed hot water exchanges heat with the gas in the filling area to form the mist.

[0018] In a second aspect, the cooling tower droplet capture method based on corona discharge according to some embodiments of this application, implemented by any of the apparatuses described herein, includes the following steps:

[0019] The spraying device sprays hot water downwards, which exchanges heat with the air introduced through the air inlet in the packing area, cooling the hot water and producing white mist;

[0020] The white mist flows upward in the cavity and reaches the vicinity of the needle electrode. Under the action of the electric field force of the high-intensity non-uniform electric field, the mist droplets become negatively charged and accelerate upward migration.

[0021] As the droplets move closer to the collection net and then closer to the electrode tip, the electric field force is greatly enhanced. Under the action of the electric field force, the droplets collide with the collection net and are thus captured by the collection net.

[0022] According to some embodiments of the present application, the cooling tower droplet capture method based on corona discharge is wherein the electric field strength increases dramatically with increasing distance from the electrode tip.

[0023] According to some embodiments of the present application, a cooling tower mist collection method based on corona discharge is used, wherein white mist flows upward in the cavity and reaches the vicinity of a needle electrode. Under the action of the electric field force of a high-intensity non-uniform electric field, the mist droplets become negatively charged and accelerate upward migration. The method includes the following steps: when the electric field strength exceeds the ionization field strength of the white mist gas molecules, the gas ionizes and releases positive ions and free electrons; the positive ions are attracted by the needle electrode connected to the negative terminal of the high-voltage power supply and move towards the needle electrode; the electrons are repelled by the needle electrode connected to the negative terminal of the high-voltage power supply and diffuse upward; the free electrons combine with the mist droplets of the white mist, making the droplets negatively charged, and the mist droplets accelerate upward migration under the action of the electric field force.

[0024] According to some embodiments of the present application, the method for collecting cooling tower droplets based on corona discharge further includes the collection of droplets captured by the collection net into water droplets on the surface of the collection net. The water droplets gradually increase in size until the gravity is greater than the electric field force, and the water droplets fall off the collection net and enter the water storage area in the cavity.

[0025] Beneficial effects:

[0026] This invention uses corona discharge technology to increase the area of ​​the collection net for capturing fog droplets, improve the collection efficiency, and reduce the power per square meter. It has the advantages of small size and low cost.

[0027] This invention achieves highly efficient capture of mist droplets from the cooling towers of thermal power plants with ultra-low energy consumption, recovering a large amount of water resources and saving thermal power plants huge costs.

[0028] This invention can also be widely applied in fields such as heating, chemical industry, and water conservancy. Attached Figure Description

[0029] Figure 1 Simplified structural diagram of the core components of the electrostatic precipitator.

[0030] Figure 2 A schematic diagram of the specific working scenario of the electrostatic precipitator.

[0031] Figure 3 A specific arrangement of the device.

[0032] Figure 4 Another specific arrangement of the device.

[0033] Figure 5A comparison chart of water collection efficiency under different applied voltages.

[0034] Figure 6 Water collection efficiency diagrams under different applied voltages.

[0035] The attached figures are labeled as follows:

[0036] 1-Fishing net; 2-Shell; 3-Air inlet; 4-Water storage container; 5-Needle electrode; 6-High voltage power supply; 7-Spraying device. Detailed Implementation

[0037] The embodiments of this application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0038] refer to Figure 1 The present invention is a cooling tower mist collection device based on corona discharge. The core of the device is an electric collection device based on the principle of corona discharge, which can achieve efficient collection of cooling tower mist with ultra-low energy consumption.

[0039] The device comprises needle-shaped electrodes 5, a collection net 1, and a high-voltage power supply 6. The needle-shaped electrodes 5 are positioned directly below the collection net 1 and are connected to the output terminal of the high-voltage power supply 6. The collection net 1 is woven from copper wire with a diameter of 5 mm, with a spacing of 3.73 mm between adjacent wires and a shading coefficient of 0.22. The collection net 1 can be configured to be either flat or concave.

[0040] The needle-shaped electrode 5 is connected to the negative terminal of the high-voltage power supply 6, and the trapping net is grounded. The high-voltage power supply outputs a current of 1mA and an output voltage of 0–10kV.

[0041] In some instances of this application, the device may include a means of generating droplets, such as hot water spraying.

[0042] In some instances of this application, the needle electrode 5 and the collecting net 1 have an insulating shell on their outer sides to restrict the direction of droplet movement.

[0043] In some instances of this application, the trapping device includes an insulated mounting bracket.

[0044] In some instances of this application, the bottom of the shell has a water storage container to store the captured water.

[0045] The corona capture method of the present invention includes the following steps:

[0046] The needle-shaped electrode 5 is connected to the high-voltage power supply 6, forming a corona electric field around the needle tip, which ionizes the air in the electric field and forms space charge.

[0047] As fog droplets flow through an electric field region, they collide with space charges and become charged, accelerating their forward migration under the influence of the space electric field.

[0048] When charged droplets reach the vicinity of the collection net, their trajectory changes due to the increased Coulomb force, causing them to move toward the collection net and eventually deposit on its surface.

[0049] As the number of deposited droplets increases, the droplets on the collection net gradually grow larger until they slide off, completing the entire process of droplet collection.

[0050] In this invention, different types of collecting nets can be selected for more efficient droplet collection. When droplets are mainly distributed around the periphery of the shell, a concave collecting net should be selected. In this case, it is foreseeable that the droplets will concentrate and deposit at the center of the collecting net. At this time, arranging needle-shaped electrodes on the periphery of the collecting net can achieve efficient collection of droplets around the shell. Conversely, when droplets are mainly distributed at the center of the shell, an convex collecting net is used, with needle-shaped electrodes arranged at the center of the collecting net to achieve collection of droplets in the center.

[0051] In one embodiment, reference is made to... Figure 2 The outer shell 2 of this invention is an insulated hyperboloid cavity. The collecting net 1 is arranged near the white mist outlet above the shell. The needle electrode 5 is arranged below the collecting net 1, at a distance of 2 to 3 centimeters from the collecting net 1.

[0052] The spray device 7 is located near the bottom of the shell. It sprays hot water downwards, and the hot water exchanges heat with the air in the packing area (not shown in the figure) to cool it down, while generating a large amount of white mist.

[0053] Air inlet 3 is located at the bottom of the housing, through which air enters the housing and flows out from the opening at the top of the housing.

[0054] At the bottom is a water storage device 4, which stores cooling water and droplets captured by the net.

[0055] In one specific embodiment, a flat-lay trapping net is used, and the needle-shaped electrodes are evenly distributed below the trapping net 1, such as... Figure 2 As shown.

[0056] The needle-shaped electrode 5 is connected to the negative terminal of the high-voltage power supply 6, forming a high-intensity non-uniform electric field near the electrode tip. The electric field strength increases dramatically with increasing distance from the electrode tip. When the electric field strength exceeds the ionization field strength of the gas molecules, the gas will ionize, releasing positive ions and free electrons. The positive ions will be attracted to the negative high-voltage electrode and move towards it, while the electrons will be strongly repelled by the negative high-voltage electrode and diffuse upwards.

[0057] The white mist generated by the spray device 7 and other structures flows uniformly upward from below. When it passes through the corona field, a large number of free electrons in the field combine with the mist droplets, making the droplets negatively charged. Under the action of the electric field force, the mist droplets change their original trajectory and accelerate upward migration.

[0058] When the droplets approach the vicinity of the collection net 1, the electric field force suddenly intensifies, causing the droplets to collide with and be captured by the net 1. The captured droplets aggregate on the surface of the net 1 into water droplets, which gradually grow until gravity exceeds the gravitational pull, causing them to detach from the copper mesh and enter the water storage container 4. This invention utilizes corona discharge technology to increase the area of ​​the collection net for droplet capture, improving collection efficiency. Simultaneously, it consumes only 19W per square meter, offering advantages such as small size and low cost. This ultra-low energy consumption achieves highly efficient capture of droplets from cooling towers in thermal power plants, recovering a significant amount of water resources and saving thermal power plants substantial costs. Furthermore, this invention can be widely applied in heating, chemical, and water conservancy fields.

[0059] In the second embodiment, a recessed trapping net is used, and the needle-shaped electrodes 5 are arranged in a ring near the housing wall 2, such as... Figure 3 As shown. In this embodiment, the white mist moves upwards near the shell wall 2. Due to the special physical structure of the concave trapping net, it is foreseeable that the captured mist droplets will flow towards the central area of ​​the trapping net 1 under the action of gravity, and form a liquid film there, accelerating the dripping rate of the water droplets.

[0060] In the third embodiment, a convex trapping net is used, and the needle electrode 5 is arranged at the center of the housing 2, such as... Figure 4 As shown. In this embodiment, the white mist moves upward along the center of the housing 2, and the captured droplets flow around the collecting net 1, forming a liquid film around it and dripping down.

[0061] Therefore, in the two embodiments described above, the capture of fog droplets and the dripping of water droplets are completed at different positions of the collection net, which effectively solves the problems of clogging and re-entrainment, and significantly increases the fog droplet collection efficiency with ultra-low energy consumption.

[0062] The implementation cases in this article are progressive, and each case focuses on the differences from other cases. The common parts of each case can be referenced.

[0063] The above provides a detailed description of the droplet electrostatic trapping device proposed in this invention. Specific examples have been elaborated in detail, but these are not exhaustive embodiments of the invention. It should be noted that for those skilled in the art, any improvements and modifications made to the invention without departing from its principles should fall within the scope of protection of the claims. In the description of this invention, it should be understood that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In this invention, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following associated objects are in an "or" relationship. "At least one" refers to one or more; "at least one of A and B," similar to "A and / or B," describes the relationship between associated objects, indicating that three relationships can exist. For example, at least one of A and B can represent: A alone, A and B simultaneously, or B alone.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cooling tower droplet collection device based on corona discharge, characterized in that, include An insulating shell, wherein the insulating shell is formed into a cavity that is narrow at the top and wide at the bottom, and the upper shell forms the opening of the cavity; A trapping net, wherein the trapping net is disposed in the cavity near the opening; An atomizing device is disposed in the lower part of the cavity to form a mist; A needle-shaped electrode is disposed in the cavity between the collecting net and the atomizing device; A water storage area is located at the bottom of the cavity.

2. The cooling tower droplet collection device based on corona discharge according to claim 1, characterized in that, The distance between the needle electrode and the trapping net is 2-3 cm.

3. The cooling tower droplet collection device based on corona discharge according to claim 1, characterized in that, The trapping net is a flat trapping net, a concave trapping net, or a convex trapping net.

4. The cooling tower droplet collection device based on corona discharge according to claim 1, characterized in that, The trapping net is woven from copper wire with a diameter of 5 mm, with a spacing of 3.73 mm between adjacent copper wires and a shading coefficient of 0.

22.

5. The cooling tower droplet collection device based on corona discharge according to claim 1, characterized in that, The negative terminal of the high-voltage power supply is connected to the needle-shaped electrode and supplies power. The collecting net is grounded. The high-voltage power supply outputs a current of 1mA and an output voltage of 0-10kV.

6. The cooling tower droplet collection device based on corona discharge according to claim 1, characterized in that, The insulating housing is provided with an air inlet; The atomizing device includes A filling zone is provided in the cavity, wherein the filling material is present. A spraying device is installed above the packing area and sprays hot water onto the packing area; The air inlet is located on the housing corresponding to the filling area, and the air inlet supplies gas to the filling area. The sprayed hot water exchanges heat with the gas in the filling area to form the mist.

7. A method for capturing cooling tower droplets based on corona discharge, characterized in that, The method, implemented by the apparatus according to any one of claims 1-6, comprises the following steps: The spraying device sprays hot water downwards, which exchanges heat with the air introduced through the air inlet in the packing area, cooling the hot water and producing white mist; The white mist flows upward in the cavity and reaches the vicinity of the needle electrode. Under the action of the electric field force of the high-intensity non-uniform electric field, the mist droplets become negatively charged and accelerate upward migration. As the droplets move closer to the collection net and then closer to the electrode tip, the electric field force is greatly enhanced. Under the action of the electric field force, the droplets collide with the collection net and are thus captured by the collection net.

8. The cooling tower droplet capture method based on corona discharge according to claim 7, characterized in that, in, The electric field strength increases dramatically with increasing distance from the electrode tip.

9. The cooling tower droplet capture method based on corona discharge according to claim 7, characterized in that, in, As the white mist flows upward within the cavity and reaches the vicinity of the needle-shaped electrode, the droplets become negatively charged and accelerate upward migration under the influence of the high-intensity non-uniform electric field. This process includes the following steps: when the electric field strength exceeds the ionization field strength of the white mist gas molecules, the gas ionizes, releasing positive ions and free electrons; the positive ions are attracted by the needle-shaped electrode connected to the negative terminal of the high-voltage power supply and move towards the needle-shaped electrode; the electrons are repelled by the needle-shaped electrode connected to the negative terminal of the high-voltage power supply and diffuse upward; the free electrons combine with the mist droplets, making the droplets negatively charged, and under the influence of the electric field, the droplets accelerate upward migration.

10. The cooling tower droplet capture method based on corona discharge according to claim 7, characterized in that, It also includes the process where fog droplets captured by the capture net gather into water droplets on the surface of the capture net, and the water droplets gradually increase in size until gravity exceeds the electric field force, at which point the water droplets fall off the capture net and enter the water storage area in the cavity.

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