JPH0316662A - Electrostatic precipitator - Google Patents

Abstract

PURPOSE:To execute a uniform corona discharge between the front ends of needle-like discharge electrodes and the peripheral edges of vent hole and to improve dust collection efficiency by disposing plural pieces of the vent holes to the waveform flat side faces of partition plates and successively providing the needle-like electrodes facing the vent holes at the front ends of the repulsion electrodes provided in parallel with dust precipitating electrodes. CONSTITUTION:Plural pieces of the vent holes 4 are disposed without intersecting with each other on the flat side faces of the waveform partition plates 3 and the needle-like electrodes 14 are connected to the font ends of the repulsion electrodes 9 extended near to the top parts of the partition plates 3 in parallel with the dust precipitating electrodes 10 by directing the front ends of the discharge toward the vent holes 4. The dust in air is exposed to the corona wind radiated from the front ends of the needle-like electrodes 14 toward the inner edges of the vent holes 4 and is electrified at the time of passing the vent holes 4 when the dusty air is fed into the precipitator from the arrow direction under the impression of a high voltage thereto. The dust is repulsed by the repulsion electrodes 9, after the passage through the vent holes 4, and is captured on the dust precipitating electrodes 10 while flowing in the form of laminar flow. The cleaned air is diffused from a lower aperture to the outside. The degradation in the dust collecting performance by the unequal discharge occurring in the turbulence of the dusty air is obviated in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electrostatic precipitator, and more specifically to improving the performance of an electrostatic precipitator. (Example) Conventional technology Conventionally, in order to uniformly charge dust in an electrostatic precipitator, the flow path of dust-containing air is divided into small flow paths with a circular cross section, and a dead electrode is provided in each small flow path. Specifically, two methods are used: a flat partition plate that divides the flow path at right angles has multiple circular holes in it, and a discharge electrode is placed opposite each of the circular holes; There was a method in which the flow path was divided into multiple cylindrical channels and a discharge electrode was installed inside each channel. However, in these conventional methods, the flow path is divided into small channels with circular cross sections, so even if these small channels are arranged closely, the aperture ratio will not be 100%. In order to make the total cross-sectional area equal to that before division, there is a disadvantage that the device becomes larger.If the flow path space in the dust collector is limited, the total cross-sectional area of the divided flow paths will be smaller than before division, so the air This created resistance, which caused noise and the need for high-output air blowing means. In addition, when the discharge current is constant in an electrostatic precipitator, the more discharge points there are, the less ozone is generated and the dust collection performance tends to be better. However, in order to prevent spark discharge, it is necessary to Since the distance between the electrodes cannot be less than a certain value, in conventional electrostatic precipitators, if the flow path space is limited, it is not possible to have more than a certain number of discharge points. There was a limit to how much ozone could be reduced by increasing the amount. In addition, as an electrostatic precipitator that can increase the number of discharge points, the ridges of two gold belts bent in a zigzag shape are butted against each other, and the ridges are passed through the butted portions. There was a method in which air holes were provided and a discharge tube was stretched through the holes, but in this method, the air holes provided on the slope of the serrated metal plate were placed in a state where they intersected with each other. However, the corona wind blown out from the discharge cotton due to corona discharge and the air flow supplied to the corona wind collide violently, resulting in turbulent flow, which has the disadvantage of reducing dust collection performance due to uneven discharge. When the discharge wire was made thinner to enhance the discharge effect, it often had the disadvantage of breaking. (c) Problems to be Solved by the Invention The present invention solves the above-mentioned problems in the conventional device, and is compact, has low air resistance, has excellent dust collection, generates little ozone, and has a wire breakage system. Our aim is to provide an electrostatic precipitator that is free of dust. (2) Means for Solving the Problems In order to achieve the above object, the present invention provides an electrostatic precipitator having a charging section and a dust collecting section, in which a partition plate having a corrugated cross section partitions a flow path of dust-containing air. , several ventilation holes are arranged on the corrugated flat side of the partition plate without intersecting each other, a dust collection electrode is extended downward from the bottom of the waveform of the partition plate, and the dust collection electrode A discharge meter facing the ventilation hole is connected to the tip of a repulsion electrode extending parallel to the top of the waveform of the partition plate, and a uniform gap is formed between the tip of the discharge meter and the peripheral edge of the ventilation hole. It has a structure in which a discharge means for performing corona discharge is provided. (E) Function and Example Next, the function of the present invention will be explained based on an example. Fig. 1 shows an example of an air This is a side sectional view of a cleaning device, in which a plurality of inverted U-shaped dust collecting electrodes 10 with narrow tips are arranged inside a casing 1 forming a flow path 2 so as to touch each other at the base. A wave-shaped partition plate 3 formed at the tip portion partitions a dust-containing air flow path 2 formed in the housing l.A plurality of wave-shaped partition plates 3 are formed on the flat side excluding the top and bottom of the wave-shaped partition plate 3. The ventilation holes 4 are arranged without intersecting each other, and the repulsion electrode 9 extends parallel to the dust collection electrode lO to near the top of the partition plate 3. At the tip of the repulsion electrode 9, there is a needle-like waste electrode lO that discharges at the tip.
4 is electrically connected with the discharge tip facing the ventilation hole 4. Each of the inverted U-shaped dust collecting electrodes 10 is in electrical contact with a dust collecting electrode having a terminal 12, and each of the repelling electrodes 9 is also connected to a terminal 11. Now, when a high voltage is applied between the terminals 11 and 12 by a high voltage power source (not shown) and dust-containing air is introduced from the direction of the arrow, the dust in the air becomes acicular when passing through the ventilation hole 4. It is exposed to the corona shower radiated from the tip of the discharge electrode l4 toward the inner edge of the vent hole 4 and is charged, and after passing through the vent hole 4, it is repelled by the repulsion electrode 9 having the same polarity as the discharge electrode, forming a laminar flow. The purified air is collected on the dust collection electrode 1O while flowing through the air, and the purified air is released to the outside through the opening at the bottom. In the present invention, the plurality of ventilation holes 4 are arranged without intersecting each other on the flat side surface of the corrugated partition plate 3 formed at the upper end of the dust collection electrode 1O, excluding the top and bottom parts, and moreover, is a so-called needle-shaped discharge electrode that discharges only from the tip, so the air supplied to the corona wind accompanying corona discharge is unilaterally steady from the root of the needle-shaped discharge electrode to the part closer to the discharge tip of the vent hole 4 via the tip. Since it is supplied in the form of a flow, the crests of two conventional jigzag-shaped metal plates are butted against each other.
There is no reduction in the dust collection rate due to uneven discharge, unlike when a linear dead electrode is stretched over a vent hole drilled in the butt portion. Furthermore, in the present invention, since the repulsion electrode 9 to which the needle-shaped electrode 14 is attached extends to the vicinity of the top of the corrugated partition plate 3, dust-containing air entering from both sides of the partition plate 3 is collected without colliding with each other. Since it flows into the dust part as a laminar flow, the dust collection efficiency will not be reduced due to turbulence caused by collisions. Furthermore, in the present invention, by selecting the pitch of the corrugated partition plate and the height from the top to the bottom, it is possible to arrange the ventilation holes in multiple stages on one side. Compared to the conventional method, the ozone concentration at the same current value was reduced, the air resistance of the flow path was reduced, and the dust collection performance was excellent. (f) Effects As explained above, in the present invention, even if the flow space in the dust collector is limited, the flow velocity in the flow path is not increased in order to perform uniform discharge, so it is excellent in low noise. It is possible to obtain good dust collection performance. Furthermore, since the present invention allows the number of discharge points to be increased without being limited to the flow path space, the amount of ozone generated can be reduced compared to the conventional method in which the number of discharge points is limited to the flow path space. ．． Furthermore, according to the present invention, there is no need to increase the flow path space in order to reduce the flow velocity in the flow path, so the device can be made compact. Furthermore, in the present invention, no turbulence occurs during corona discharge, so the dust collection performance is even higher.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of one embodiment of the present invention. !・・Housing 2・・Flow path 3・・Partition 1fii 4・・Vent hole 5・・
Insulator 6... Terminal 7... Terminal 8... Discharge wire 9... Repulsion electrode lO... Dust collection electrode 11... Terminal l
2...Terminal 13...Charging part l4...Acicular electrode l5...Discharge point

Claims (1)

[Claims] (1) In an electrostatic precipitator having a charging part and a dust collection part,
A partition plate having a corrugated cross section is provided to partition the flow path of the dust-containing air, and a plurality of ventilation holes are arranged on the corrugated flat side of the partition plate without intersecting each other, and from the corrugated bottom of the partition plate. A dust collection electrode is extended downward, and a discharge meter facing the ventilation hole is connected to the tip of a repulsion electrode that extends parallel to the dust collection electrode to near the top of the waveform of the partition plate. An electrostatic precipitator characterized in that a discharging means for uniformly discharging corona is provided between the periphery of the ventilation hole and the periphery of the vent hole.