A high-voltage electrostatic demisting device based on a wettable film electrode

Abstract

The application relates to a high-voltage electrostatic demisting device based on a wetting film electrode, which is characterized by comprising a ventilation shell and a hydrophobic film and a hydrophilic film structure; a mounting position is arranged in the ventilation shell, a water guide hole is arranged at the bottom of the ventilation shell, the top of the hydrophobic film and the hydrophilic film structure is arranged on the mounting position, the bottom of the hydrophobic film and the hydrophilic film structure extends downward and corresponds to the water guide hole, the hydrophobic film and the hydrophilic film structure respectively divide the ventilation shell into an air inlet cavity and an air outlet cavity, the hydrophobic film and the hydrophilic film structure are electrically connected with a high-voltage module through wires; a metal wire hole and a metal wire; one end of the metal wire is electrically connected with the high-voltage module, the metal wire is a high-voltage discharge anode / cathode, and the electrode of the hydrophobic film and the hydrophilic film structure is a corresponding cathode / anode. The device has the advantages that the demisting effect of the prior art is poor and the stability is insufficient, efficient demisting and frost prevention can be realized, the electrostatic field force and the surface wettability are combined to realize synergistic effect, and the demisting efficiency and the stability are greatly improved.

Description

Technical Field

[0001] This invention relates to a high-voltage electrostatic demister based on a wettable membrane electrode. Background Technology

[0002] In industrial wet processes, cooling towers, humidifiers, medical atomization, food processing and other scenarios, a large number of fine droplets with a particle size of 1-50μm are suspended in the air to form "white smoke" or aerosols. This not only reduces visibility, but may also carry bacteria, salt crystals and organic pollutants that diffuse with the exhaust gas, causing problems such as material loss, environmental pollution and equipment corrosion. The mainstream demisting equipment currently available in the industry is divided into three categories: wire mesh demisters, cyclone separators, and traditional plate electrostatic precipitators, all of which have obvious technical defects. Wire mesh demisters and cyclone separators rely on inertial collision and gravity settling to complete gas-liquid separation. They are only effective at intercepting large liquid droplets with a diameter of 10μm or larger. They have extremely low removal efficiency for submicron-sized fine droplets, resulting in severe droplet escape. Long-term operation can easily lead to clogging and a continuous increase in wind resistance. Traditional electrostatic demisters use solid metal plates and metal wire mesh as dust collection electrodes. The continuous spread of droplets on the metal surface forms a continuous conductive water film, which easily causes electrical shielding and back corona discharge, greatly weakening the electric field adsorption capacity. At the same time, the water film on the metal surface has strong adhesion and is difficult to fall off quickly by gravity. The accumulation of water inside the equipment will cause secondary atomization, continuously reducing the demisting performance and making it unsuitable for high humidity and 24-hour continuous operation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-voltage electrostatic defogging device based on a wettable membrane electrode, which solves the problems of poor defogging effect and insufficient stability of the prior art. It can achieve efficient defogging and anti-frost, and by combining the synergistic effect of electrostatic force and surface wettability, it can significantly improve the defogging efficiency and stability.

[0004] To achieve the above objectives, the present invention is implemented as follows: it is a high-voltage electrostatic demister based on a wettable membrane electrode, comprising a vent housing that extends through the left and right sides, and a hydrophobic membrane and a hydrophilic membrane structure; an installation position is provided inside the vent housing, and a water guide hole is provided at the bottom of the vent housing; the top of the hydrophobic membrane and the hydrophilic membrane structure is located at the installation position, and the bottom of the hydrophobic membrane and the hydrophilic membrane structure extends downward to correspond to the water guide hole; the hydrophobic membrane and the hydrophilic membrane structure divide the vent housing into an air inlet chamber and an air outlet chamber respectively; the hydrophobic membrane and the hydrophilic membrane structure are electrically connected to a high-voltage module through wires. One or more metal wire holes and one or more metal wires; the metal wire holes are provided on the vent housing and distributed vertically, the metal wire holes penetrate the air intake cavity, and the metal wires pass through the corresponding metal wire holes; one end of the metal wire is electrically connected to the high-voltage module, the metal wire is the positive / negative electrode of the high-voltage discharge, and the hydrophobic and hydrophilic membrane structure electrodes are the corresponding negative / positive electrodes, with opposite polarities to form opposing high-voltage electric fields.

[0005] This technical solution also includes a first light transmittance meter and a second light transmittance meter. The first light transmittance meter is located on the outer wall of the air inlet cavity and to the left of the metal wire. The second light transmittance meter is located on the outer wall of the air outlet cavity and to the right of the hydrophobic and hydrophilic membrane structures.

[0006] This technical solution also includes an air distribution plate, which is disposed in the air inlet cavity and located on the left side of the first light transmittance instrument.

[0007] In this technical solution, the horizontal distance between the metal wire and the hydrophobic or hydrophilic membrane structure is 1.5-2.5cm.

[0008] In this technical solution, the diameter of the metal wire is 0.1-0.3 mm.

[0009] In this technical solution, the hydrophobic or hydrophilic membrane structure is a hydrophobic membrane with a pore size of 0.2 μm and a contact angle of >90°.

[0010] In this technical solution, the hydrophobic or hydrophilic membrane structure is a hydrophilic membrane with a pore size of 0.2 μm and a contact angle of <90°.

[0011] In this technical solution, the input voltage of the high-voltage power supply module is 7V-12.5V, the input power is ≤5W, and the output voltage is 20KV-30KV.

[0012] The advantages of this invention compared to existing technologies are: it solves the problems of poor demisting effect and insufficient stability of existing technologies, and can achieve efficient demisting and frost prevention, realizing an integrated demisting process of "uniform gas - charging - adsorption - fine filtration - flow guiding", while providing applications of this device in membrane distillation components and evaporators, expanding its applicable scenarios. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 The front view; Figure 3 yes Figure 2 AA section view; Figure 4 yes Figure 1 Top view; Figure 5 yes Figure 4 BB section view; Figure 6 yes Figure 1 A 3D view from another angle; Figure 7 yes Figure 6 A magnified view of a portion of the image; Figure 8 This is a vertical statistical chart showing the water collection capacity and demisting rate of the hydrophobic membrane of the present invention under different input voltages; Figure 9 This is a vertical statistical chart showing the water collection capacity and demisting rate of different copper wires in the hydrophobic membrane of the present invention; Figure 10 This is a vertical statistical chart showing the water collection and demisting rate at different positions of the hydrophobic membrane copper wire of the present invention; Figure 11 This is a vertical statistical chart showing the water collection capacity and demisting rate of the hydrophilic membrane of the present invention under different input voltages; Figure 12 This is a vertical statistical chart showing the water collection capacity and demisting rate of different copper wires in the hydrophilic membrane of this invention; Figure 13 This is a vertical statistical chart showing the water collection and demisting rate at different positions of the hydrophilic membrane copper wire of the present invention. Detailed Implementation

[0014] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0015] In the description of this invention, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and are not intended to require the invention to be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0016] In this invention, unless otherwise explicitly specified and limited, the term "set" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or a detachable arrangement or an integral part; it can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. Example

[0017] like Figures 1 to 13 As shown, it is a high-voltage electrostatic demister based on a wettable membrane electrode, including... A ventilation housing 1 and a hydrophobic and hydrophilic membrane structure 8 are provided through the left and right sides; an installation position 14 is provided inside the ventilation housing 1, and a water guide hole 5 is provided at the bottom of the ventilation housing 1. The top of the hydrophobic and hydrophilic membrane structure 8 is located on the installation position 14, and the bottom of the hydrophobic and hydrophilic membrane structure 8 extends downward to correspond to the water guide hole 5. The hydrophobic and hydrophilic membrane structure 8 divides the ventilation housing 1 into an air inlet chamber 11 and an air outlet chamber 12 respectively. The hydrophobic and hydrophilic membrane structure 8 is electrically connected to the high-voltage module through a wire. One or more metal wire holes 4 and one or more metal wires 7; the metal wire holes 4 are provided on the vent housing 1 and distributed vertically, the metal wire holes 4 penetrate the air intake cavity 11, and the metal wires 7 pass through the corresponding metal wire holes 4; one end of the metal wire 7 is electrically connected to the high voltage module, the metal wire 7 is the positive / negative electrode of the high voltage discharge, and the hydrophobic and hydrophilic membrane structure 8 electrodes are the corresponding negative / positive electrodes, with opposite polarities to form opposing high voltage electric fields.

[0018] Step 1: Airflow enters the cavity A humid airflow containing fine droplets enters the intake chamber 11 from the left side, and the airflow diffuses evenly within the chamber, flowing towards the membrane electrode.

[0019] Step 2: Ionization and charging by high-voltage electric field The high-voltage module provides power, making the metal wire 7 the discharge electrode and the hydrophobic and hydrophilic membrane structures 8 the collector electrode, forming a stable high-voltage electrostatic field between the two electrodes; water mist and fine droplets in the airflow are rapidly charged and become electrostatic after passing through the electric field region.

[0020] Step 3: Electrostatic adsorption, coagulation, and separation Under the influence of an electric field, charged droplets migrate directionally towards the membrane electrode (hydrophobic / hydrophilic membrane) with opposite polarity, adsorb and converge; tiny droplets continuously condense into large droplets on the membrane surface.

[0021] Step 4: Gravity-guided drainage + clean air discharge The condensed liquid water flows downward along the membrane electrode by gravity and is discharged from the water guide hole 5 at the bottom of the shell. The clean gas, freed from mist droplets, penetrates the membrane structure and enters the right-side gas outlet chamber 12 to complete the demisting operation and is discharged outward.

[0022] In this embodiment, a first light transmittance meter 3 and a second light transmittance meter 6 are also included. The first light transmittance meter 3 is disposed on the outer wall of the air inlet cavity 11 and located to the left of the metal wire 7; the second light transmittance meter 6 is disposed on the outer wall of the air outlet cavity 12 and located to the right of the hydrophobic membrane and hydrophilic membrane structure 8.

[0023] In this embodiment, a gas equalization plate 2 is also included. The gas equalization plate 2 is disposed in the air inlet cavity 11 and located to the left of the first light transmittance instrument 3.

[0024] In this embodiment, the horizontal distance between the metal wire 7 and the hydrophobic or hydrophilic membrane structure 8 is 1.5-2.5 cm.

[0025] In this embodiment, the diameter of the metal wire 7 is 0.1-0.3 mm.

[0026] In this embodiment, the hydrophobic or hydrophilic membrane structure 8 is a hydrophobic membrane with a pore size of 0.2 μm and a contact angle of >90°.

[0027] In this embodiment, the hydrophobic or hydrophilic membrane structure 8 is a hydrophilic membrane with a pore size of 0.2 μm and a contact angle of <90°.

[0028] In this embodiment, the input voltage of the high-voltage power supply module is 7V-12.5V, the input power is ≤5W, and the output voltage is 20KV-30KV.

[0029] 1. Dual-electrode electric field coupling for extremely high defogging efficiency: This device innovatively integrates the function of a conductive electrode into a hydrophobic or hydrophilic membrane structure 8, so that the metal wire 7 discharge electrode and the hydrophobic or hydrophilic membrane structure 8 collect electrode form an opposing high-voltage electrostatic field. Combined with the membrane sieving and guiding structure, a dual defogging mechanism of electrostatic charge electrodirectional adsorption + membrane surface coagulation and interception is constructed, which completely solves the pain points of traditional defogging equipment in incomplete removal of micron-level fine fog droplets and disordered adsorption. The fog droplet capture coverage is greatly improved, and the defogging efficiency can reach more than 99%.

[0030] 2. Precise parameter matching ensures stable and safe electric field operation: The wire diameter, electrode spacing, membrane parameters, and high and low voltage electrical matching parameters are precisely defined. It adopts a low-voltage input and high-voltage boost output mode, resulting in low power consumption, no risk of electric field breakdown, and no risk of electrostatic damage to the membrane. The air distribution plate 2 rectifier structure ensures that the airflow passes evenly through the electric field area, avoiding defogging failure caused by excessive local airflow. The dual-electrode opposing electric field layout is uniform and stable, which can meet the requirements of long-term continuous industrial operation.

[0031] 3. Real-time effect monitoring and strong controllability: Equipped with inlet and outlet dual transmittance meters, it can collect airflow fog concentration and transmittance data in real time, intuitively providing feedback on the defogging effect, facilitating equipment operation and maintenance parameter adjustment, and avoiding idling and inefficient operation due to malfunctions.

[0032] 4. Perfect water guiding structure, no risk of liquid accumulation: The water guiding hole 5 at the bottom of the shell can quickly guide the separated liquid water out, eliminating the problems of liquid accumulation, backflow, and secondary misting, and ensuring the cleanliness of the equipment during long-term operation.

[0033] 5. Wide adaptability to operating conditions and high application value: The hydrophobic and hydrophilic membrane structures can be flexibly switched according to the operating conditions to accurately adapt to the tail gas demisting and steam purification needs of membrane distillation components and evaporators, effectively improving membrane distillation flux and evaporator heat exchange efficiency, and reducing equipment wear and material waste.

[0034] The two transilluminators each have their own function.

[0035] First Transmitter 3: Collect baseline transmittance values: measure the transmittance of the original high-humidity airflow before entering the electrostatic defogging device in real time, and record the initial fog concentration as an experimental control baseline; Second transmittance meter 6: Detects residual fog after treatment: Measure the transmittance of the airflow after fog collection and defogging by the electrostatic field of the metal mesh; the higher the transmittance, the more water vapor / fog droplets are captured by the device, and the better the defogging performance; The transmittance value T was measured by the first transmittance meter 3. in The transmittance value T was measured by the second transmittance meter 6. out T0 is obtained from the no-load calibration before the experiment;

[0036] The external power supply high-voltage module adopts a low-voltage input and high-voltage boost output architecture. The module input voltage is constant at 7V-12.5V, and the total input power is ≤5W. After high-frequency inverter boost and voltage doubler rectification, the module can achieve an electrostatic output voltage of 20KV-30KV. It can build a stable high-voltage electrostatic field with extremely low power consumption, low energy consumption, strong electric field controllability, and is suitable for long-term continuous operation of small industrial equipment, with higher operational safety. Example

[0037] like Figure 8 As shown, this embodiment focuses on the impact of the input voltage (V) on the device's demisting efficiency and water collection capacity, clarifying the optimal parameter range and providing experimental basis for the device's optimized design.

[0038] 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: Discharge electrode (metal wire 7): A copper wire with a diameter of 0.2mm is used, which runs horizontally through the air intake cavity 11 and is electrically connected to the positive electrode of the external high voltage module. 8. Hydrophobic or hydrophilic membrane structure: A hydrophobic membrane with a pore size of 0.2 μm is used. The metal wire 7 is located in the middle of the air intake cavity 11; the distance from the hydrophobic membrane is 2cm. 2. Experimental conditions The input voltage was changed to 7.5V, 9V, 10.5V, and 12V respectively. Each experiment was repeated 3 times, and the average water collection volume was taken as the experimental result.

[0039] 3. Experimental Results

[0040] The experimental results show that an input voltage of 10.5V is the optimal input voltage. Example

[0041] like Figure 9 As shown, the focus of this embodiment is on the number of metal wires, clarifying the optimal parameter range and providing experimental basis for the optimized design of the device.

[0042] 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: The input voltage is 10.5V; 8. Hydrophobic or hydrophilic membrane structure: A hydrophobic membrane with a pore size of 0.2 μm is used. The distance between the metal wire 7 and the hydrophobic membrane is 2 cm; 2. Experimental conditions Change the number of metal wires: use one, two, or three wires. The first wire is in the middle of the air intake chamber 11, the two wires are in the middle and upper parts of the air intake chamber 11, and the three wires are in the middle, upper, and lower parts of the air intake chamber 11. 3. Experimental Results

[0043] The number of metal wires has a significant impact on the demisting efficiency (water collection capacity) of the device, and the optimal number of wires is 3. Example

[0044] like Figure 10 As shown, this embodiment illustrates the effect of the positional relationship between the metal wire 7 and the air inlet chamber 11 on the device's demisting efficiency and water collection capacity. 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: The input voltage is 10.5V; 8. Hydrophobic or hydrophilic membrane structure: A hydrophobic membrane with a pore size of 0.2 μm is used. The distance between the metal wire 7 and the hydrophobic membrane is 2 cm; There is 1 metal wire 7. 2. Experimental conditions Change the position of the metal wire 7 to the middle position, the upper position, and the lower position respectively; 3. Experimental Results

[0045] 3. Results Analysis The optimal position is the middle point between the water collection volume and the demisting efficiency. Example

[0046] like Figure 11 As shown, this embodiment focuses on the impact of the input voltage (V) on the device's demisting efficiency and water collection capacity, clarifying the optimal parameter range and providing experimental basis for the device's optimized design.

[0047] 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: Discharge electrode (metal wire 7): A copper wire with a diameter of 0.2mm is used, which runs horizontally through the air intake cavity 11 and is electrically connected to the positive electrode of the external high voltage module. 8. Hydrophobic or hydrophilic membrane structure: A hydrophilic membrane with a pore size of 0.2 μm is used. The metal wire 7 is located in the middle of the air intake cavity 11; the distance from the hydrophilic membrane is 2cm. 2. Experimental conditions The input voltage was changed to 7.5V, 9V, 10.5V, and 12V respectively. Each experiment was repeated 3 times, and the average water collection volume was taken as the experimental result.

[0048] 3. Experimental Results

[0049] The experimental results show that an input voltage of 10.5V is the optimal input voltage. Example

[0050] like Figure 12 As shown, the focus of this embodiment is on the number of metal wires, clarifying the optimal parameter range and providing experimental basis for the optimized design of the device.

[0051] 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: The input voltage is 10.5V; 8. Hydrophobic or hydrophilic membrane structure: A hydrophilic membrane with a pore size of 0.2 μm is used. The distance between the metal wire 7 and the hydrophilic membrane is 2 cm; 2. Experimental conditions Change the number of metal wires: use one, two, or three wires. The first wire is in the middle of the air intake chamber 11, the two wires are in the middle and upper parts of the air intake chamber 11, and the three wires are in the middle, upper, and lower parts of the air intake chamber 11. 3. Experimental Results

[0052] The number of metal wires has a significant impact on the demisting efficiency (water collection capacity) of the device, and the optimal number of wires is 3. Example

[0053] like Figure 13 As shown, this embodiment illustrates the effect of the positional relationship between the metal wire 7 and the air inlet chamber 11 on the device's demisting efficiency and water collection capacity. 1. Preparation of experimental materials and apparatus The experimental setup is based on the high-voltage electrostatic demister device based on the wettability membrane electrode of this invention, and the specific parameters are as follows: The input voltage is 10.5V; 8. Hydrophobic or hydrophilic membrane structure: A hydrophilic membrane with a pore size of 0.2 μm is used. The distance between the metal wire 7 and the hydrophilic membrane is 2 cm; There is 1 metal wire 7. 2. Experimental conditions Change the position of the metal wire 7 to the middle position, the upper position, and the lower position respectively; 3. Experimental Results

[0054] 3. Results Analysis The optimal location is at the bottom, considering both water collection capacity and demisting efficiency.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A high-voltage electrostatic demister based on a wettable membrane electrode, characterized in that... include A ventilation housing (1) with a through-hole on both sides and a hydrophobic and hydrophilic membrane structure (8); an installation position (14) is provided inside the ventilation housing (1), and a water guide hole (5) is provided at the bottom of the ventilation housing (1). The top of the hydrophobic and hydrophilic membrane structure (8) is located on the installation position (14), and the bottom of the hydrophobic and hydrophilic membrane structure (8) extends downward to correspond to the water guide hole (5). The hydrophobic and hydrophilic membrane structure (8) divides the ventilation housing (1) into an air inlet chamber (11) and an air outlet chamber (12). The hydrophobic and hydrophilic membrane structure (8) is electrically connected to the high-voltage module through a wire. One or more metal wire holes (4) and one or more metal wires (7); the metal wire holes (4) are provided on the ventilation housing (1) and distributed vertically, the metal wire holes (4) penetrate the air intake cavity (11), and the metal wires (7) pass through the corresponding metal wire holes (4); one end of the metal wire (7) is electrically connected to the high voltage module, the metal wire (7) is the positive / negative electrode of the high voltage discharge, and the hydrophobic and hydrophilic membrane structure (8) electrodes are the corresponding negative / positive electrodes, with opposite polarities to form opposing high voltage electric fields.

2. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... It also includes a first light transmittance device (3) and a second light transmittance device (6). The first light transmittance device (3) is located on the outer wall of the air inlet cavity (11) and to the left of the metal wire (7); the second light transmittance device (6) is located on the outer wall of the air outlet cavity (12) and to the right of the hydrophobic and hydrophilic membrane structure (8).

3. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 2, characterized in that... It also includes an air distribution plate (2), which is located inside the air inlet cavity (11) and to the left of the first light transmittance instrument (3).

4. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... The horizontal distance between the metal wire (7) and the hydrophobic or hydrophilic membrane structure (8) is 1.5-2.5 cm.

5. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... The diameter of the metal wire (7) is 0.1-0.3 mm.

6. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... The hydrophobic or hydrophilic membrane structure (8) is a hydrophobic membrane with a pore size of 0.2 μm and a contact angle of >90°.

7. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... The hydrophobic or hydrophilic membrane structure (8) is a hydrophilic membrane with a pore size of 0.2 μm and a contact angle of <90°.

8. The high-voltage electrostatic demister based on a wettable membrane electrode according to claim 1, characterized in that... The input voltage of the power high-voltage module is 7V-12.5V, the input power is ≤5W, and the output voltage is 20KV-30KV.

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