JPS6048156A - Electrical dust collector - Google Patents

Abstract

PURPOSE:To restrain surely the deposition of powder on a discharge electrode by providing an earthing pole to be brought into contact with the discharge electrode at the upper side of a dust remover in the rotating direction of a dust collecting electrode. CONSTITUTION:A bending discharge electrode 12 fixed to a casing 1 is arranged so that the leading end of a rod-shaped discharge electrode 5 can be rotated. The bending discharge electrode 12 is connected to a negative pole of a DC power source 13, and a rotating shaft 2 electrically connected with a dust collecting electrode 3 is earthed through a contact conductor 14. In this way, arc discharge takes place between the bending discharge electrode 12 and the rod- shaped discharge electrode 5, and corona discharge takes place between the rod-shaped electrode 5 and the dust collecting electrode 3. The granular powder in the gas is then separated and collected on the dust collecting electrode 3 by Coulomb's force, and the corona discharge is stopped in a granular powder recovery zone, and the granular powder deposited on the dust collecting electrode 3 is easily dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides rotating bodies that are arranged in the direction of rotation and are electrically insulated from each other so as to enable long-term continuous operation and good collection of powder and granules from dust collection electrodes. Attach a plurality of discharge electrodes, and attach a dust collection electrode facing the discharge electrodes, and connect a dust-containing gas supply path and a clean gas discharge path to the casing housing the discharge electrodes and dust collection electrodes. With,
A guide is provided to flow the gas from the supply path to the discharge path in the direction in which the discharge electrodes are arranged, a powder removal tool that acts on the dust collection electrode is provided, and an energization device that charges the discharge electrode is installed to control the action of the powder removal tool. The present invention relates to an improvement in an electrostatic precipitator formed in such a way that electricity is turned off in the vicinity.

Conventionally, as shown in Japanese Utility Model Application Publication No. 57''-136444, powder was collected efficiently from the dust collecting electrode by simply removing the current from the discharge electrode and the dust collecting electrode. However, during actual operation, powder adheres to the discharge electrode, and the powder increases with long-term use, resulting in insufficient charging of the powder by the discharge electrode and There are 6 drawbacks: Powder emitted from the discharge electrode flows into the discharge channel, deteriorating the dust collection performance.

An object of the present invention is to make it possible to reliably suppress powder adhesion to the discharge electrode with extremely simple modification.

The characteristic configuration of the dust collector according to the present invention is that the de-energization area of the device that energizes the discharge electrode is located on the upper side in the rotating direction of the dust collector electrode than the powder removal tool that acts on the dust collector electrode. The purpose is to set the earth pole to be contacted, and its effects are as follows.

In other words, as a result of various experiments, it has been found that when the ground electrode is brought into contact with the discharge electrode, the powder adhering to the discharge electrode can be effectively separated and dropped, and the adhesion of powder to the discharge electrode can be definitely prevented. In other words, by simply adding a ground electrode, the discharge function of the discharge electrode can be maintained reliably and well over a long period of time, and powder adhesion to the dust collection electrode can be prevented. It can sufficiently improve the solid-gas separation performance, and can effectively prevent powder from being mixed into the exhaust gas due to powder discharge from the discharge electrode. Moreover, it becomes possible to provide an economically advantageous electrostatic precipitator that is extremely durable.

Next, examples will be shown.

As shown in FIGS. 1 and 2, a drive rotating shaft (2) with variable speed operation is installed in a casing +11 made of electrically insulating material,
A plurality of disk-shaped dust collecting electrodes +31 (
! - installed in parallel so that they rotate together in the force direction F),
The dust collection electrodes (3) are placed in the same space, and a drum (4) made of electrically insulating material is housed so as to rotate together in the direction (F). The rod-shaped discharge electrodes t51 k are arranged in the circumferential direction of the drum (4) and are attached electrically insulated from each other.

A gas supply path (6) containing powder and a clean gas discharge path (7) are connected to the casing fi+, and a supply path (6) is connected to the casing fi+.
) is provided with a collision plate (8) for solid-gas separation and a powder/grain material collection window (9) below it, and a partition member t10 that spans the inward wall (la) of the casing il+ and the drum (4).
A gas flow path is formed so that the gas flows along the dust collection electrode (3) and toward the discharge path (7) in a direction opposite to the direction of rotation thereof.

A curved discharge electrode (ri, a'a) fixed to a casing (tl) is arranged so that the tip of the rod-shaped discharge electrode (on a rod-shaped discharge electrode) rotates along and close to the curved discharge electrode (ri, a'a).
The rotating shaft (2), which is electrically connected to the negative pole of the dust collecting electrode (3), is grounded via the contact conductor 114+, thereby connecting the curved discharge electrode α and the rod-shaped discharge electrode (6). ), and corona discharge between the rod-shaped discharge electrode (5) and the dust collection electrode (3), and the dust collection electrode (3)
The zone (
Corona discharge gold is generated in Al, and the dust collection electrode (3)
It is structured so that the skin powder particles that adhere to the skin can easily fall off.

Partitioning member (to) 'a-forming, Figures 8 and 91
As shown in Figure 4, toward the upper side in the rotational direction of the dust collection electrode (3) and discharge electrode (5), there are small and medium openings through which the dust collection electrode (3) T- passes, and wide openings through which the discharge electrode 15+ passes. It is composed of alternating shapes (also used on days).

A ground electrode (16) is provided in the powder collection zone (A) to make contact with the rod-shaped discharge electrode 16), so that the powder can easily fall off electrostatically after adhering to the discharge electrode (6), and is mechanically The structure is such that it is forced to fall due to a physical impact.

Next, another example will be shown. In order to make the gas flow in the direction in which the discharge electrodes (6) are arranged in parallel in the Cushing flJ, various other methods may be used, such as providing a guide fixed cylinder instead of the rotating drum (4). Guide arrangements are available, collectively referred to as guides (4), 11O), which may in turn be configured such that the gas flows in the direction of rotation of the discharge electrode (6).

As shown in FIG. 7, the discharge electrode t51 has improved electrical insulation θ.
The drum is made to bend at night so that the length of the yoke surface becomes large (4)
The discharge electrode (5) may be attached to the rotary shaft (2) or the like in place of the drum (4).In short, the discharge electrode (5) may be attached to the rotating body (4) in the following state, electrically insulated from each other. - The specific structure for charging is, for example, a curved discharge electrode (1'4 is brought into contact with a rod-shaped discharge electrode (5), etc.)
Various other modifications are possible, and they are the energizing device u2.
．． Collectively referred to as us. Also, the energizing device 02)
The position and width of the energization release vc (A) of , Ill may be set as appropriate, and the positive electrode of the DC power source Oat may be connected to the discharge electrode (6).

A powder removal tool (BJ) may be provided separately from the partition member (10). For example, as shown in FIG. Ingredients (B
Alternatively, as shown in Fig. 6, a magnet rubber end and a Teflon 4 may be attached to the tip of an elastic membrane (17) such as a leaf spring so as to be in close contact with the precipitator if +31. Powder removal (El may also be configured. In addition, tear 0
The component ult may be omitted or replaced with another wear-resistant material, and the magnet uan may be omitted.

The shape and arrangement of the ground electrode may be changed, for example by bending it so that it fits into the dust collecting electrode (3), as shown in Figure 7.
Various changes to the pond are possible.

The dust collecting electrode (3) may be arranged like a plate conveyor and rotated, or the rotating shaft (2)
The direction of the dust collection electrode (3
) may be connected to a DC power source.

[Brief explanation of the drawing]

Fig. 1 is a 1UIfr side view showing an embodiment of the present invention, Fig. 2 is a developed cross-sectional view of Fig. 1 with some parts omitted, Fig. 8 is a cross-sectional view taken along the line ■-■ of Fig. 1, and Fig. 4 #: is a sectional view taken along the line N-IV in FIG. 3. 5 to 7 are sectional views of main parts showing another embodiment of the present invention.

Claims (1)

[Claims] A plurality of discharge electrodes (5) which are electrically insulated from each other are attached to the rotating body (4) in the rotation direction thereof, and a dust collection electrode (3) facing the discharge electrodes 151 is attached to the rotating body (4). A dust-containing gas supply path (6) and a clean gas discharge path (7) are connected to the gauging 11) which includes a discharge electrode 151 and a dust collection electrode (:1), and from the supply path (6) to the a guide f41, 1+o) for causing gas to flow across the discharge path (7) in the direction in which the discharge electrodes 15) are arranged;
611 Powder removal tool (11) that acts on the dust collection electrode (21)
19, and an energizing device U'4゜0 field for charging the discharge electrode (5) is formed so as to stop energizing near the action of the powder removing tool (Bl), , OIJ energization device configuration, 0 field de-energization area (8), mouth (1 powder removal tool (Bl) than the dust collecting electrode (
3) An electrostatic precipitator having a ground electrode Q1 on the upper side in the rotation direction (F) to be brought into contact with the discharge electrode (5).