JPH0217222B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to an electrostatic dust removal device using a porous dielectric material as an electrode spacing plate, and particularly to a dust removal device with improved dust removal ability by improving the electrode arrangement. (Prior technology) In order to remove minute particles floating in exhaust gas, etc.
It is well known to use filter devices that collect particles by means of porous bodies that allow these gases to pass through. However, this method has problems such as the difficulty of collecting microparticles, and increasing the thickness of the collection material increases fluid resistance and pressure loss, so the dust removal ability remains constant. The limit has been reached. On the other hand, electrostatic dust removal equipment also prevents smoke damage by charging fine particles in the gas to be removed in a corona discharge area, passing the gas between electrode plates to which a high voltage is applied, and electrostatically adsorbing the charged particles. It is used for such purposes. This method has the characteristics of being able to collect particles as small as approximately 0.1μ in diameter, and having extremely low pressure loss due to the dust removal device. However, in order to increase the collection ability, it is necessary to increase the applied voltage or lengthen the voltage application section, but the electric field concentrates on the raised part of the particles deposited on the electrode plate, causing discharge. , a phenomenon occurs in which the collected particles scatter again. (Problems to be Solved by the Invention) The present inventor first disposed electrodes on a porous dielectric,
By applying a strong electric field to the porous dielectric,
It is possible to collect particles with a particle size smaller than the pore size of the porous dielectric, and the electrodes are insulated by the dielectric.
We have developed an unprecedented type of electrostatic dust removal device that can apply a strong electric field without the fear of discharge due to the accumulation of collected particles. (Unexamined Japanese Patent Publication No. 59-19564) This invention is
The aim is to further improve the dust removal ability by improving the dust removal device. Structure of the Invention (Means for Solving Problems) In this invention, as shown in FIG.
A plurality of electrodes 3, 4, . (Function) When the above filter element A passes the gas to be removed through the porous dielectric, fine particles such as dust in the gas are physically trapped in the pores of the porous dielectric, and It is also electrostatically adsorbed and collected. Electrostatic adsorption requires the width of the electric field to be strong enough to receive the electrostatic force during the time the particles reach the collection surface, but at the same time, the stronger the electric field, the higher the collection effect. Needless to say. In this invention, the electrodes 3, 4, 5, and 6 are made of foil and have a constant width, and as is well known, electric lines of force are concentrated at the edges of the electrodes due to the well-known edge effect. Demonstrates high collection ability. Since the edges of the electrode are located on both edges of the plurality of electrodes, the above-mentioned portions with high trapping ability are generated in multiples of the electrodes, and it is thought that the overall trapping ability is increased. (Example) Urethane foam 1 with a thickness of about 10 mm and a width of about 50 mm
Place approximately 10mm wide Al foils 3, 4 on the surface at approximately 10mm intervals.
Strips 1 and 2 on which coatings 7 and 8 are formed by pasting 5 and 6 and spraying polystyrene liquid over them.
Wrap the filters together to form a disc-shaped filter element A as shown in Fig. 2.
Extracting electrodes 9, 9' are connected to the second electrodes 3, 4 and 5, 6, respectively. The electrodes 3 and 4, and 5 and 6 may have the same polarity or opposite polarity, and may have different applied voltages. Since the one shown in FIG. 2 has the same polarity and the same voltage, one pair of extraction electrodes is sufficient. A gas containing particles such as smoke was flowed vertically through the disc of this filter element, and a DC voltage of several kilovolts was applied between the extraction electrodes to measure the collection rate of particles in the gas.The results are as follows. It was hot.

[Table] Looking at the cross section of the element, as shown in Figure 2b, the gas is most conspicuously collected at the electrode end B on the inflow side, followed by the second electrode end C. It was found that the incidence was high. FIG. 3 shows another embodiment, in which the strip shown in FIG. 1A is directly packed into a net bag 11 made of nylon or the like and pushed into the duct 10 completely. According to this method, the dust removal device can be freely installed in the existing duct regardless of the cross-sectional shape and thickness of the duct 10, and it has been confirmed that the dust removal capacity is equivalent to that shown in Figure 2. There is. Effects of the Invention As described above, this invention has a seemingly simple configuration, but as shown in the collection rate of the example, it can also collect fine particles with a diameter of about 0.1μ, which was previously thought to be extremely difficult to collect. This resulted in the remarkable effect of being able to collect at an extremely high rate of over 70%. Furthermore, by applying a resin coating as shown in the example, it is easy to protect the electrodes from the corrosion of the processing gas, and the cost is low. This makes it possible to realize a dust removal device for home use, which can be used not only in hospitals, etc., but also to eliminate the causes of health problems caused by air pollution in cities, such as dust containing harmful components.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a filter element of a dust removal device of the present invention, and FIGS. 2 and 3 are conceptual diagrams showing a method of forming a filter using the filter element. 1, 2: porous dielectric, 3, 4, 5, 6: electrode, 9: extraction electrode, 10: duct, 11: mesh bag.

Claims (1)

[Claims] 1. On at least one side of the strip of porous dielectric material,
A plurality of electrode strips are provided at intervals across the width of the strip, one set of such strips are overlapped, and a high voltage is applied to the electrodes to create a strong electric field in the strip. An electrostatic dust removal device characterized by passing gas through the strips while forming them and collecting suspended particulates in the gas.