CN115301634A - An electrostatic dust removal device and method for heliostats - Google Patents

Abstract

The invention discloses an electrostatic dust removal device and method for heliostats. The device comprises an insulating frame, the upper surface of the insulating frame is fixed with upper screen electrodes arranged in parallel, and the lower surface of the insulating frame is fixed with parallel arranged upper screen electrodes. The lower screen electrode, the upper screen electrode and the lower screen electrode are arranged at 90°; the upper screen electrode and the lower screen electrode are respectively connected to the reversely changing high-voltage AC power supply. The electrostatic precipitator and method disclosed in the invention do not consume water resources; have high safety and minimal energy consumption; only when the heliostat needs to be cleaned, the device is placed on the surface of the heliostat for dust removal, and the heliostat is not reduced. reflectivity of the mirror; the present invention has low implementation cost and is suitable for existing photothermal power plants.

Description

An electrostatic dust removal device and method for heliostats

technical field

The invention relates to the technical field of dust removal for heliostats, in particular to an electrostatic dust removal device and method for heliostats.

Background technique

Due to the large area of the tower solar thermal power station, in order to reduce the cost of land, the tower solar thermal power station is mostly built on land and sunny geographical areas, such as deserts and Gobi Desert. Although sufficient sunshine in these areas is conducive to solar power generation, these areas also often have a large amount of mineral dust floating, which will gradually accumulate on the surface of solar panels and reduce their efficiency. For example, in windy and sandy weather, mirror dust averages Reduces reflectivity by 1% for one day.

Cleaning of heliostats is usually done by flushing or scouring with fresh water, however, manual operation is difficult in the harsh desert environment, labor costs are uncertain, and water delivery to power plants is expensive.

The existing electrostatic precipitator is to embed the electrodes on the surface of the heliostat, and the electrostatic force generated by the parallel electrodes drives the dust particles to move in one direction, so as to achieve the purpose of dust removal. Due to the shading effect of the electrodes, the reflectivity of the heliostats will be reduced. At the same time, the initial cost is huge, and electrodes need to be embedded for each heliostat, which is not suitable for large-scale solar thermal power plants that have been built.

Contents of the invention

In order to solve the above technical problems, the present invention provides an electrostatic dust removal device and method for heliostats, which can achieve effective dust removal without reducing the reflectivity of heliostats, low implementation cost, and are suitable for existing photothermal power plants .

To achieve the above object, the technical scheme of the present invention is as follows:

An electrostatic precipitator for heliostats, comprising an insulating frame, the upper surface of the insulating frame is fixed with upper screen electrodes arranged in parallel, the lower surface of the insulating frame is fixed with lower screen electrodes arranged in parallel, and the upper screen electrodes The electrodes and the lower screen electrodes are arranged at 90°; the upper screen electrodes and the lower screen electrodes are respectively connected to reversely changing high-voltage AC power sources.

In the above solution, the upper screen electrode and the lower screen electrode are made of copper wire, and the surface is coated with a polyester film.

Preferably, the diameter of the copper wire is 1 mm, and the thickness of the polyester film is 0.15 mm.

In the above solution, the distance between two adjacent upper screen electrodes is 5 mm, the distance between two adjacent lower screen electrodes is 5 mm, and the gap between the upper screen electrodes and the lower screen electrodes is 5 mm.

In the above solution, the frequency of the low-frequency high-voltage AC voltage is 1-10 Hz, and the voltage is 9 kV.

An electrostatic dust removal method for heliostats, using the above-mentioned electrostatic dust removal device for heliostats, when cleaning, place the insulating frame on the surface of the heliostat, so that the lower screen electrode is close to the heliostat The mirror lens is connected to a high-voltage AC power supply, and the insulating frame is driven to slide left and right on the surface of the heliostat through an external drive device; when a reversely changing low-frequency high-voltage AC voltage is applied to the upper screen electrode and the lower screen electrode, the Coulomb force generated and dielectrophoretic force act on the dust particles near the electrode, the left and right sliding of the lower screen electrode on the surface of the heliostat can frictionally charge the dust particles, the dust particles on the surface of the heliostat are stirred by the alternating electrostatic field near the electrode, and pass through The gap between the upper screen electrode and the lower screen electrode is ejected; under the action of gravity, the ejected dust settles to the ground.

Through the above technical solution, the electrostatic dust removal device and method for heliostats provided by the present invention have the following beneficial effects:

1. The present invention uses electrostatic dust removal and does not consume water resources;

2. Although the working voltage of the present invention is very high, because the maximum current is very low, the safety is high, and the energy consumption is extremely small;

2. In the present invention, only when the heliostat needs to be cleaned, the device is placed on the surface of the heliostat to remove dust, without reducing the reflectivity of the heliostat;

4. The implementation cost of the present invention is low, and it is suitable for existing solar thermal power plants.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings that are required in the description of the embodiments or the prior art.

Fig. 1 is a schematic diagram of an electrostatic precipitator for heliostats disclosed in an embodiment of the present invention;

Figure 2 is a schematic diagram of an electrostatic precipitator for heliostats that is modularly spliced;

Fig. 3 is a schematic diagram of an electrostatic dust removal method for heliostats disclosed in an embodiment of the present invention.

In the figure, 1. Insulation frame; 2. Upper screen electrode; 3. Lower screen electrode; 4. High-voltage AC power supply; 5. Cleaning vehicle; 6. Vibration motor; 7. Telescopic swing arm; 8. Bracket; mirror.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

The present invention provides an electrostatic precipitator for a heliostat 9, as shown in Figure 1, comprising an insulating frame 1, the upper surface of the insulating frame 1 is fixed with upper screen electrodes 2 arranged in parallel, and the lower surface of the insulating frame 1 is fixed with The lower screen electrodes 3 arranged in parallel, the upper screen electrodes 2 and the lower screen electrodes 3 are arranged at 90°; where the warp is the upper screen electrode 2, the latitude is the lower screen electrode 3, or the warp is the lower screen electrode 3, and the latitude is the upper screen Electrode 2. The upper screen electrode 2 and the lower screen electrode 3 are respectively connected to a reversely changing high-voltage AC power supply 4 .

In the embodiment of the present invention, the upper screen electrode 2 and the lower screen electrode 3 are made of copper wire, and the surface is coated with a polyester film. Specifically, the diameter of the copper wire is 1 mm, and the thickness of the polyester film is 0.15 mm, and the polyester film can prevent dielectric breakdown.

In the embodiment of the present invention, the distance between two adjacent upper screen electrodes 2 is 5 mm, the distance between two adjacent lower screen electrodes 3 is 5 mm, and the distance between the upper screen electrodes 2 and the lower screen electrodes 3 The gap is 5mm.

In this embodiment, the frequency of the low-frequency high-voltage AC voltage is 1-10 Hz, and the voltage is 9 kV.

The above-mentioned electrostatic precipitator can be modularly spliced, as shown in FIG. 2 , to realize dust removal for heliostats 9 of different areas.

An electrostatic dust removal method for a heliostat 9, the electrostatic dust removal device of the present invention can be assembled on a cleaning vehicle 5, as shown in Figure 3, the cleaning vehicle 5 is equipped with a high-voltage AC power supply 4 and a vibrating motor 6, and the electrostatic dust removal device Connect to the vibrating motor 6 by a bracket 8. Through the telescopic swing arm 7, the present invention can be used for dust removal of heliostats 9 with different areas and different heights.

details as follows:

When the heliostat 9 is dirty and needs to be cleaned, place the insulating frame 1 on the surface of the heliostat 9, make the lower screen electrode 3 close to the lens of the heliostat 9, connect the high-voltage AC power supply 4, and drive it through the vibration motor 6 The insulating frame 1 slides left and right on the surface of the heliostat 9; when a reversely changing low-frequency high-voltage AC voltage is applied to the upper screen electrode 2 and the lower screen electrode 3, the Coulomb force and dielectrophoretic force generated act on the dust particles near the electrodes The left and right sliding of the upper and lower screen electrodes 3 on the surface of the heliostat 9 can frictionally charge the dust particles. The dust particles on the surface of the heliostat 9 are stirred by the alternating electrostatic field near the electrodes and pass through the upper screen electrode 2 and the lower screen electrode. The gap between 3 sprays out; under the action of gravity, the sprayed dust settles to the ground.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. An electrostatic precipitator for heliostats, characterized in that it comprises an insulating frame, the upper surface of the insulating frame is fixed with upper screen electrodes arranged in parallel, and the lower surface of the insulating frame is fixed with lower screen electrodes arranged in parallel Electrodes, the upper screen electrode and the lower screen electrode are arranged at 90°; the upper screen electrode and the lower screen electrode are respectively connected to a reversely changing high-voltage AC power supply. 2 . The electrostatic precipitator for heliostats according to claim 1 , wherein the upper screen electrode and the lower screen electrode are made of copper wires, and the surface is coated with a polyester film. 3 . 3 . The electrostatic precipitator for heliostats according to claim 2 , wherein the diameter of the copper wire is 1 mm, and the thickness of the polyester film is 0.15 mm. 4 . 4. A kind of electrostatic precipitator for heliostat according to claim 1, is characterized in that, the distance between two adjacent upper screen electrodes is 5mm, and the distance between adjacent two lower screen electrodes The distance is 5mm, and the gap between the upper screen electrode and the lower screen electrode is 5mm. 5 . The electrostatic precipitator for heliostats according to claim 1 , wherein the frequency of the low-frequency high-voltage AC voltage is 1-10 Hz, and the voltage is 9 kV. 6. An electrostatic dust removal method for heliostats, adopting a kind of electrostatic dust removal device for heliostats as claimed in claim 1, is characterized in that, when cleaning, the insulating frame is placed on the surface of the heliostat , so that the lower screen electrode is close to the heliostat lens, the high-voltage AC power supply is connected, and the insulating frame is driven to slide left and right on the surface of the heliostat through an external drive device; When the high-voltage AC voltage is applied, the generated Coulomb force and dielectrophoretic force act on the dust particles near the electrodes, and the left and right sliding of the lower screen electrode on the surface of the heliostat can frictionally charge the dust particles, and the dust particles on the surface of the heliostat are absorbed by the electrodes near the electrodes. The alternating electrostatic field is stirred and ejected through the gap between the upper screen electrode and the lower screen electrode; under the action of gravity, the ejected dust settles to the ground.

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