KR101326875B1 - Electrostatic precipitator and control method thereof - Google Patents

Abstract

According to an aspect of the present invention, a dust collecting device includes a body part having a plurality of dust collecting chambers and a discharge electrode installed in the body part to charge dust with a negative electrode, and a dust collecting plate installed in the body part and charged with an anode to collect fine dust. And a transformer for supplying power to the discharge electrode, a thruster connected to the discharge electrode to separate dust attached to the surface of the discharge electrode, and a power cut-off unit for controlling the electrical connection between the discharge electrode and the transformer. .

Description

Dust collector and control method of dust collector {ELECTROSTATIC PRECIPITATOR AND CONTROL METHOD THEREOF}

The present invention relates to a dust collector and a method for controlling the dust collector, and more particularly, to a dust collector and a method for controlling the dust collector having a power interruption unit.

In large dust emission plants such as thermal power plants and sinter plants, dust collectors are essential. Recently, the concentration of dust emission and the regulation of fine dust have been tightened, so there is a need for improving the dust collection efficiency of the electric dust collector.

Conventional electric current collectors ionize dust using a discharge electrode and a dust collecting plate by continuous charging of a high voltage charging device, and then collect the dust and drop the sludge by dropping the discharge electrode and the dust collecting plate to remove the dust. However, when the discharge electrode or the dust collecting plate is struck in the continuous charged state, the desorption effect of the ionized dust is insufficient, resulting in a problem that the dust collection efficiency is lowered.

When the dust collection efficiency is lowered as well, the wear rate of the main blower is increased, and micropores of the activated carbon installed in the adsorption tower are blocked, which frequently causes downtime of the facility due to maintenance.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a dust collector and a control method of the dust collector that can improve the dust collection efficiency.

According to an aspect of the present invention, a dust collecting device includes a body part having a plurality of dust collecting chambers and a discharge electrode installed in the body part to charge dust with a negative electrode, and a dust collecting plate installed in the body part and charged with an anode to collect fine dust. And a transformer for supplying power to the discharge electrode, a thruster connected to the discharge electrode to separate dust attached to the surface of the discharge electrode, and a power cut-off unit for controlling the electrical connection between the discharge electrode and the transformer. .

The discharge electrodes installed inside the body form a single discharge module, and the power cut-off unit may block a connection between the discharge module and the transformer, and further include a ground part for controlling the connection between the discharge electrode and the ground line. Can be.

According to another aspect of the present invention, a method for controlling a dust collector includes controlling a plurality of discharge electrodes as a discharge electrode module, thereby controlling a dust collector having a plurality of discharge electrode modules, and blocking electrical connection to the discharge electrodes constituting the discharge electrode module. A power off step, and a concentrated follow-up step of tracking the discharge electrodes constituting the discharge module.

The power cutoff step may further include a grounding step of electrically connecting a ground line to the discharge electrode, and the control method of the dust collector is performed simultaneously with the concentrated follow-up step, and the random chase step of randomly hitting each discharge electrode. It may further include.

In the concentrated chase step, each discharge electrode module may be sequentially struck, and in the power cut-off step, the electrical connection to the dust collecting plate may be blocked, and in the concentrated chase step, the dust collecting plate may be struck together with the discharge electrode.

According to the present invention, since the thrust is performed while the electrical connection between the discharge electrode and the transformer is interrupted, dust can be removed more efficiently. In addition, since the discharge electrode is grounded, the influence of the induced voltage can be minimized.

1 is a block diagram showing a dust collector according to an embodiment of the present invention.
Figure 2 is a block diagram showing the inside of the body portion according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the specification and drawings, the same reference numerals denote the same elements.

1 is a block diagram showing a dust collector according to an embodiment of the present invention, Figure 2 is a block diagram showing a body portion of the dust collector according to an embodiment of the present invention.

1 and 2, the dust collector according to the present embodiment is charged with a body portion 20 having a plurality of dust chambers 21, a discharge electrode 17 for charging dust to the cathode, and an anode. Dust collecting plate 16 for collecting fine dust, transformer 12 for supplying electric power to discharge electrode 17, and chase devices 14 for separating dust attached to the surface of discharge electrode 17 and dust collecting plate 16; 15) and a power interrupter 13 for controlling the electrical connection of the discharge electrode 17 and the transformer 12.

The body portion 20 is formed in a room shape having an interior space, and has an inlet 23 and an outlet 24 into which exhaust gas containing dust is introduced. In addition, a plurality of dust collecting chambers 21 are formed in the body portion 20, and a plurality of discharge electrodes 17 and dust collecting plates 16 are installed in the dust collecting chambers 21.

In addition, the body portion 20 is provided with a transformer 12 electrically connected to the discharge electrode 17 and the dust collecting plate 16. The transformer 12 serves to transform an AC power supply into a high voltage DC power supply.

Between the transformer 12 and the discharge electrode 17, a power interrupter 13 for controlling the electrical connection of the transformer 12 and the discharge electrode 17 is provided. The power cut-off unit 13 is connected to the power line 31 that electrically connects the transformer 12 and the discharge electrode 17. The power cut-off unit 13 is formed in a switch form, and electrically connects or cuts off the transformer 12 and the discharge electrode 17 according to an applied signal. In addition, although not shown, a power interrupter may be installed between the transformer and the dust collecting plate. When the power cut-off unit is installed between the transformer 12 and the dust collecting plate 16, the power of the dust collecting plate 16 is cut off together with the discharge electrode 17 at the time of the chase.

The dust collecting plate 16 has a plate shape and is charged with an anode to adsorb dust. The discharge electrode 17 is in the form of an iron wire or a rigid body and has a plurality of protruding electrodes. In addition, a high voltage of 70 kV to 80 kV is charged to the discharge electrode 17 and is suspended in the body portion 20.

When a high voltage is applied to the discharge electrode 17, ionization occurs due to corona discharge. The ionized cations are neutralized by the discharge electrode 17, but the anions flow into the air stream to collide with the particles and charge the dust to the negative ions. Dust particles charged with negative ions move to the dust collecting plate 16 charged with the positive electrode and are collected.

In this process, the dust particles are not only attached to the dust collecting plate 16 but also attached to the discharge electrode 17, so that dust collection efficiency is lowered. Therefore, a process of removing dust attached to the dust collecting plate 16 and the discharge electrode 17 is essential. to be.

To this end, the thruster 14 is connected to the upper portion of the discharge electrode 17, and the thruster 15 is also connected to the upper portion of the dust collecting plate 16.

However, if the dust collecting plate 16 and the discharge electrode 17 are struck in a state where voltage is applied to the collecting plate 16 and the discharge electrode 17, the ionized dust is not easily separated from the collecting plate 16 and the discharge electrode 17, so that a detachment effect is obtained. Insufficient

However, as the present embodiment, the power cut-off unit 13 is formed to cut off the electrical connection between the discharge electrode 17 and the transformer 12, the electrical attraction is removed, so dust is easily collected at the dust collecting plate 16 and the discharge electrode 17. Can be separated.

However, even when the power of the discharge electrode 17 is cut off, the high voltage of the neighboring discharge electrode 17 is induced, which may cause a problem of dust removal efficiency. In this embodiment, in order to solve this problem, the ground line 32 is connected to the ground line 32 is installed to control the connection between the discharge electrode 17 and the ground line 32 is provided. Ground portion 35 is composed of a cam 36 and a motor 37 for rotating the cam 36, the cam 36 is connected to the ground line 32 is installed. Accordingly, the ground line 32 may be connected to or disconnected from the power line 31 connected to the discharge electrode 17 by the rotation of the cam 36.

After the power source of the discharge electrode 17 is cut off using the power cut-off unit 13, the discharge electrode 17 and the ground line 32 are electrically connected to each other to make the potential of the discharge electrode 17 substantially 0V.

When the power source of the discharge electrode 17 is cut off, dust attached to the discharge electrode 17 and the dust collecting plate 16 is removed by using the thrusters 14 and 15 to chase the discharge electrode 17 and the dust collecting plate 16.

The plurality of discharge electrodes 17 constitutes one discharge module 18, and a plurality of discharge module 18 is installed in the body 20. In this case, the discharge electrode module 18 may be formed of all the discharge electrodes 17 installed in one dust collecting chamber 21, or may be part of the discharge electrodes 17 installed in one dust collecting chamber 21.

The power cut-off unit 13 cuts off the connection between the discharge unit module 18 and the transformer 12 of one of the plurality of discharge unit modules 18, and the thruster 14 constitutes the discharge unit module 18 with the power cut off. The discharge electrodes 17 are struck. Accordingly, the discharge electrodes 17 whose power is cut off can be concentrated at a time.

Hereinafter, a method of controlling a dust collector using a dust collector according to an embodiment of the present invention will be described.

The control method of the dust collector according to the present embodiment includes a power cutoff step of blocking electrical connection between the discharge electrodes 17 and the transformer 12, and a concentrated follow-up step of hitting the discharge electrodes 17.

In the power off step, the plurality of discharge electrodes 17 are constituted by the discharge electrode module 18, and electrical connection between the discharge electrodes 17 and the transformer 12 constituting one discharge electrode module 18 is cut off. In addition, in the power off step, not only the electrical connection between the discharge electrode 17 and the transformer 12 may be cut off but also the electrical connection between the dust collecting plate 16 and the transformer 12 may be cut off.

The power off step further includes a grounding step for electrically connecting the ground line 32 to the discharge electrode 17. Grounding step is the potential of the discharge electrodes 17 by connecting the ground line 32 and the power line 31 installed to the discharge electrode 17 by using the ground portion 35 composed of the cam 36 and the motor 37. Make 0V. In the grounding step, the entire discharge electrodes 17 constituting one discharge module 18 are connected to the ground line 32.

In the concentrated follow-up step, the plurality of discharge electrodes 17 are constituted by the discharge electrode modules 18, the discharge electrodes 17 constituting one discharge electrode module 18 are struck together, and the plurality of discharge electrode modules 18 are sequentially To chase. In addition, in the concentrated follow-up step, not only the discharge electrodes but also the dust collector together.

In addition, the control method of the dust collector according to the present embodiment is performed at the same time as the above-described concentrated chase step, and further includes a random chase step of randomly hitting each discharge electrode 17. The random adding step randomly selects and discharges the discharge electrodes 17 installed in the body 20 without blocking the electrical connection between the discharge electrode and the transformer.

2 shows that the concentrated and random thrusts are performed simultaneously, and the circle marked in black indicates the discharge electrode on which the thrust is being performed.

As shown in FIG. 2, it can be seen that in the random chase step, the discharge electrodes 17 are randomly selected and struck in each dust chamber 21.

As described above, according to the control method of the dust collector according to the present embodiment, since the electrical connection between the discharge electrode module 18 and the transformer 12 is interrupted, the discharge electrode 17 is connected to the ground line 32, and the thruster is more efficient. As a result, dust adhering to the discharge electrode 17 and the dust collecting plate 16 may be removed.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

12: transformer 13: power disconnect
14: chase device 15: chase device
16: dust collector 17: discharge electrode
18: discharge module 20: body
21: Dust collection room 23: Entrance
24: exit 31: power line
32: ground line 35: ground portion
36: cam 37: motor

Claims (8)

A body part having a plurality of dust chambers;
A discharge electrode installed in the body part and configured to charge dust with a cathode;
A dust collecting plate installed in the body part and charged with an anode to collect fine dust;
A transformer for supplying power to the discharge electrode;
A thruster connected to the discharge electrode and separating dust attached to the surface of the discharge electrode;
A power cut-off unit controlling electrical connection between the discharge electrode and the transformer;
Including;
The plurality of discharge electrodes installed in the body portion forms a discharge electrode module, a plurality of the discharge electrode module is installed in the body portion,
The power cut-off unit cuts off the connection of any one of the discharge module and the transformer of the discharge module,
And a dust collecting device configured to chase each of the discharge electrodes constituting the one discharge module at the same time and at the same time randomly chase each discharge electrode whose electrical connection to the transformer is not interrupted. delete The method according to claim 1,
Dust collecting device further comprises a grounding unit for controlling the connection of the discharge electrode and the ground line. In the control method of the dust collector having a plurality of discharge electrode module composed of a plurality of discharge electrode,
A power cut-off step of cutting off electrical connections to the discharge electrodes constituting the discharge electrode module; And
A concentrated follow-up step of hitting the discharge electrodes constituting the discharge electrode module;
Including;
And a random chase step which is performed simultaneously with the concentrated chase step and randomly chases each discharge electrode which is not cut off. 5. The method of claim 4,
The power off step further includes a grounding step of electrically connecting a ground line to the discharge electrode. delete 6. The method of claim 5,
The concentrated thrusting step is a control method of the dust collector to sequentially hit each discharge module. 6. The method of claim 5,
The control method of the dust collector to cut off the electrical connection to the dust collecting plate in the power-off step, and the dust collecting plate in addition to the discharge electrode in the concentrated chase.

Images