KR970003860B1 - Electric dust collector - Google Patents

Abstract

Disclosed is an electrical dust collector. The collector comprises an inner pipe(2), a discharge rod(3), a rotational electric field part(4), a hopper(5), a stream diffusion plate(6) and an external electrode plate(8). The inner pipe(2) of + electrode is installed as a cross direction to the gas introducing pipe 1a. The discharge rod(3) of - electrode is installed along center of the inner pipe(2). The rotational electric field part(4) is formed between the inner pipe(2) and the discharge rod(3), so that the dust gas rotates and declines. The hopper(5) which is connected the lower ending portion of the inner pipe(2) has an enlarged portion. The stream diffusion plate(6) is installed in the hopper(5) to guide the dust gas to the rotational electric field part(4). The external electrode plate(8) of - electrode is installed in a electric field part(7). Thereby, the static electrical force and centrifugal force is simultaneously applied for collecting the dust, so that the collection efficiency is improved to various dust.

Description

Electric dust collector

1 and 2 is a view showing the principle of the conventional electrostatic precipitator.

2 is a view showing movement of particles during corona discharge in a conventional electrostatic precipitator.

3 is a cross-sectional view showing an operating state of the present invention.

* Description of the symbols for the main parts of the drawings *

1: appearance 1a: inlet pipe

2: inner tube 3: discharge rod

4: rotating electric field part 5: hopper part

5a: expansion part 6: air diffusion plate

6a: diffused cone 7: electric field

8: external electrode plate

The present invention relates to an electrostatic precipitator, in particular, to increase the efficiency of the electrostatic precipitator by simultaneously using the electrostatic force and centrifugal force in the current collector, it is possible to collect the dust of the type that is not collected in the conventional electrostatic precipitator.

A general electrostatic precipitator forms an electric field by applying a high voltage between the positive and negative poles installed in a space at regular intervals, as shown in FIGS. If abnormal, gas molecules are ionized with (+) ions and electrons in the ionization region near the (-) pole, and outside of the ionization region, electrons are absorbed by neutral gas molecules to generate coronal discharge. The fine particles are then charged. In the case of industrial electrostatic precipitator, a dust collector electrode is used as a discharge electrode using a flat electrode as a negative electrode, and a flat plate (see FIG. 1A) or a cylindrical (see FIG. 1B) electrode as a positive electrode. Used as (-) Ions generated by corona discharge are attached to the fine particles in the gas, and the fine particles with (-) ions become charged particles with negative charges, Part of the positive ion generated by ionization impinges on the fine particles, causing the fine particles to become charged particles with a positive charge, and thus the negative positive pole by the coulomb force. Will face. As such, most of the fine particles are negatively charged and attached to the dust collecting electrode, but some fine particles are positively attached to the discharge electrode with a positive charge. Particles attached to the electrode surface by suction are neutralized electrically and then subjected to mechanical vibration with a wrapper or the like to be peeled off and dropped into the lower hopper to be collected. However, the above-mentioned conventional dust collector is, firstly, in the case of dust having a large resistivity, it is difficult to be attached to the dust collecting plate because it is not charged well, and it is difficult to be neutralized electrically even if it is charged and suctioned, so that it does not peel off from the electrode even by mechanical vibration. . In addition, in the case of dust having a small specific resistance, it is easy to be charged and easily attached to the dust collecting plate, but since it is electrically neutralized too easily, there is a problem in that it is not scattered and is discharged to the outside.

Second, since the suction to the electrode depends only on the electric force, a strong electric field is required for the suction, and the electric field must be long enough to be transferred to the electrode before being discharged to the outside.

Third, in order to peel off the dust adsorbed on the dust collecting plate and transfer it to the lower hopper, the mechanical impact is peeled off, and the dust is freely dropped by the weight of the dust at right angles or in the opposite direction to the flow of dust gas. There was a problem that dust is easily discharged to the outside of the dust collector.

The present invention, in view of the above, the dust electric field flowing through the inlet pipe is rotated and the rotating electric field, and the hopper unit to collect the dust gas rotated in the first electric field first and guide the electric field; By providing an electric dust collector including an electric field for corona discharging the dust gas induced in the hopper portion to be dust collected in the process of passing through the dust gas or rotary electric book and the hopper unit, the electric book in order to be difficult to be collected in the conventional electric dust collector In order to be able to collect dust and to reduce the size and mechanical impact force of the dust collector, and to solve the disadvantages of the conventional electric dust collector.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An electrostatic precipitator which forms an electric field by applying a high voltage between a positive electrode and a negative electrode installed in a space at regular intervals, and is provided in an inlet pipe 1a installed in the exterior 1 and into which a distribution gas flows. The inner tube (2) and the discharge rod (3) which is arranged at the center of the inner tube (2) and becomes the (-) pole, which is embossed to cross vertically with respect to the inner tube (2), and the inner tube (2) and the discharge rod ( 3) is installed in communication with the rotary electric field portion 4 for rotating the dust gas down between the lower portion of the inner tube (2) and the hopper portion (5) having an expanding portion (5a), and the hopper portion (5) To include the airflow diffusion plate 6 which is internally formed and guides the dust gas to the electric field 7 of the exterior 1, and the external electrode plate 8 which is internally installed in the electric field 4 and has a negative polarity. It is composed.

In the present invention, the dust gas of the linear motion entering the inflow pipe (1) hits the inner pipe (2) communicated perpendicularly intersecting the inflow pipe (1) is converted into a rotational movement to rotate and rotate in the rotating electric field (4) do. At this time, the discharge rod (3) serves as a discharge electrode as a (-) pole, the inner tube (2) becomes a (+) pole to act as a dust collecting pole, the rotating electric field between the discharge rod (3) and the inner tube (4) ), A high voltage of 25KV ~ 140KV is applied to generate a corona discharge, and the dust particles passing through the electric field are electrically charged and subjected to a coulomb force that moves toward the inner wall of the inner tube (2) serving as a dust collector. On the other hand, the dust particles are rotated by the rotating descending air flow in the inner tube 2 and thus receive a rotational inertia force and also move toward the inner wall of the inner tube 2. As such, the electric electric coulomb force and the rotational inertia force simultaneously act on the rotating electric field part 4 to attract the dust particles to the inner wall of the inner tube 2, so that the size of the electric field required for the dust collector is higher than that of the conventional electric dust collector using only the electric coulomb force. It becomes much smaller. On the other hand, the dust transferred to the inner wall of the inner tube 2 is peeled off from the wall of the inner tube 2 by the air flow and the known mechanical vibration which rotates in the inner tube 2, and gradually descends to the hopper part 5. . In this case, in the conventional electrostatic precipitator, the peeling is caused by the vibration generated by the vibration generating unit 9, and the downward movement is performed by the self-weight of the dust. . In the present invention, mechanical vibration and the rotary downdraft act at the same time to force peeling, and the separated dust is forcibly rotated down by the rotary downdraft so that there is no fear that it will not be separated and will be scattered again.

When the dust gas which has passed through the rotating electric field part 4 and rotates down reaches the hopper part 5, the wind speed decreases rapidly because it becomes larger than the inner tube 2 of the cross-sectional area of the conical expanding part 5a. Accordingly, the dust that has been rotated by the air flow along the inner wall of the inner tube 2 is collected by dropping to the bottom of the hopper portion 5 by its own weight because the air flow is rapidly weakened. At the center of the hopper portion 5, as in the cyclone, an air flow diffusion plate 6 having a diffusion cone portion 6a is provided in the center of the rotation descending air flow to prevent the phenomenon of the rotation rising air. The rotated dust gas is diffused by the airflow diffusion plate 6, but does not flow into the inner tube 2 and is led to the electric field 7 of the exterior 1 because no rotational rise airflow is generated at the center.

As described above, the dust gas collected by the hopper unit 5 is charged to the electric field unit 7 while passing through the electric field unit 7, and collected by secondary electric coulomb force. The action in the electric field 7 is the same as that of the conventional electric precipitator. That is, the outer electrode plate 8 having the same (-) polarity as the discharge rod 3 of the rotating electric field 4 serves as the discharge electrode, and the outer surface of the inner tube 2 acts as a dust collecting electrode so that the outer electrode plate 8 Corona discharge occurs between the outer surface of the inner tube (2). The dust passing through the electric field is attracted to the outer surface of the inner tube 2 and the outer electrode plate 8 by the electric coulomb force. The electric field 7 preferably has a cross-sectional area more than twice as large as that of the rotating electric field 4, in which case the wind speed in the electric field 7 is 1/2 or less and accordingly, Since the inertial force is relatively large compared to the electric coulomb force, the transition to the electrode is easy and the flow of air flow is stable, so that the dust dropped on the hopper part 5 is not scattered. Once attached to the outer electrode plate 8 or the inner tube 2, the dust is peeled off by mechanical vibration, dropped by its own weight, and collected by the lower hopper portion 5, which is the same as the principle of a general electric dust collecting paper.

As described above, the present invention collects the rotating electric field part 4 through which the dust gas introduced through the inlet pipe 1a is rotated and descends, and the dust gas rotated and lowered by the rotating electric field part 4 in a primary manner. By providing an electric dust collector including a hopper portion 5 leading to the electric field portion 7 and an electric field portion 7 for corona discharge of the dust gas induced in the hopper portion 5, the dust gas is rotated. 4) and the hopper (5), the electric field (7) in order to be collected in the process of going through.

Claims (5)

An electrostatic precipitator which forms an electric field by applying a high voltage between a positive electrode and a negative electrode installed in a space at regular intervals, and is provided in an inlet pipe 1a installed in the exterior 1 to introduce dust gas. The inner tube 2 communicating vertically with each other and becoming a positive pole, the discharge rod 3 arranged in the center of the inner tube 2 to become a negative pole, and the inner tube 2 and the discharge rod. Rotating electric field portion 4 formed between the three to rotate the dust gas down, the hopper portion 5 is provided in communication with the lower portion of the inner tube (2) having an enlarged portion (5a), and the hopper portion Airflow diffusion plate 6 which is built in (5) and guides dust gas into electric field 7 of exterior 1, and external electrode plate 8 which is built in electric field 7 and has (-) polarity. Electrostatic precipitator, including). An electrostatic precipitator as set forth in claim 1, characterized in that the hopper portion (7) is formed with a conical enlargement portion (5ao) whose cross sectional area is sharply larger than that of the inner tube (2). 2. An electrostatic precipitator as set forth in claim 1, wherein an upper surface of said airflow diffusion plate (6) is formed with a diffusion cone (6a) capable of preventing the rotation rising airflow from occurring in the center portion. An electrostatic precipitator as claimed in claim 1, characterized in that the cross-sectional area of the electric field part (6) is more than twice the cross-sectional area of the rotating electric field part (4). The electric dust collector according to claim 1, wherein dust attached to the outer electrode plate (8) and the inner tube (2) is peeled off by a known mechanical vibration.