JPH01180259A - Hammering device in electrostatic precipitator - Google Patents

Abstract

PURPOSE:To reduce the cost and setting area by setting one hammering device between the two-electric-field dust collecting plates, using a reversible motor as the motor for driving the hammering device, and allowing the hammer to hit the center of an anvil. CONSTITUTION:When a driving arm 10 is rotated in the direction as shown by the arrow, the driving arm 10, an intermediate arm 5, and a hammer arm 6 are successively placed at the positions shown by the alternate long an two short dashed lines. When the driving arm 10 is further rotated from the position shown by the full line, the hammer arm 6 and a hammer 7 are rotated by gravity, and the hammer hits the anvil 8 of the left dust collecting plate 1 and a shock bar 9. When the driving arm 10 is conversely rotated counterclockwise, the hammer hits the right dust collecting plate 1'. In the normal operation, the rotation of the driving shaft 4 is controlled so that the front chamber-side precipitator 1 is hitted two or three times while the rear chamber-side precipitator 1' is hit once.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hammering device in a dry type electric concentrator II device for cleaning waste in power plants, industrial boilers, cement kilns, garbage incinerators, heating furnaces, etc. It is related to.

[U.S.-based technology] As pollution regulations have become stricter, the electrostatic precipitators currently in use cannot meet the dust collection performance with a single electric field, and mechanical and electrical failures have occurred. In this case, there is a problem that the plant operation must be immediately stopped, so multiple electric fields are used.

Figure 4 shows a cross-sectional view of a conventionally used two-field electrostatic precipitator. FIG. 3 shows an enlarged view of the dust collecting plate hammering device, which is surrounded by a dotted line in the figure.

Including 11. According to the inflow direction of f, the first electric field is called the front chamber, and the rear one is called the back chamber. Since the front chamber collects a larger amount of dust than the rear chamber, the hammering cycle of the dust collecting plate must be shortened in proportion to the hammering cycle in the front chamber and shortened in the rear chamber.

Therefore, separate hammering devices are installed in the front and rear chambers.

■Problems to be Solved by the Invention] In the conventional one-type drop hammer type hammering device, as shown in FIG. It is necessary to protrude the tip of the anvil 8 by a length l.

Therefore, in order to attach the hammering device, it is necessary to widen the space between the casing and the dust collection plate by one minute. In the case of 2 electric fields, the dust collector takes 21 minutes. The longer the dust collector is, the larger the casing is, and since the outside is usually moisturized, the heat insulation work also becomes larger, which is very uneconomical.

Naturally, the installation area becomes large, and especially in the case of indoor installation of electric IA equipment, the size of the building also becomes large, which is further uneconomical.

Normally, the anvil 8 and the shocker 9 are assembled with the dust collection plate 1 at a factory before being shipped, so if the anvil 8 and the shocker 9 are protruding, transportation cannot be carried out due to restrictions under the Road Traffic Act. Therefore, all installation work has to be done on-site, which increases construction costs.Furthermore, special tools are required to install with high-tensile bolts, and special tools must be provided at each site. The assembly work environment in the factory is not very good, so there is a risk that the tightening will not be sufficient.
There is a problem in that the quality is less reliable than when assembled in a factory.

Next, explanation will be given based on the fj&4 diagram.

Normally, a hammering device is attached to each of the dust collecting plate 1 in the front chamber and the dust collecting plate 1'' in the rear chamber.An independent hammering device and driving device are required for each electric field.

The hammering cycle is shortened in the front chamber because the amount of collected dust is larger than in the rear chamber. In other words, the hammering cycle is different between the front and rear chambers.

It varies depending on the stickiness of Guess F, the amount of Guess F, etc., but usually,
The front chamber is hammered once every 5 to 15 minutes and the rear chamber is hammered once every 15 to 45 minutes, and the hammering of the front chamber and the hammering of the rear chamber are performed at the same time to improve the hammering effect. electrically interlocked to prevent

That is, although there are two sets of hammering devices, hammering is not performed at the same time, so when one set of hammering devices is operating, the other hammering device is idle, which is uneconomical. be.

In addition, the hammering device is used at the entrance/exit 7 of the dust collection plate as shown in Figure 4.
- Normally, it is installed on the hopper side, but if the space in that part is large, there is a high possibility that the dust-containing gas will leak into a part of the hopper at the bottom without passing through the dust collection part, so a fairly large-scale leak prevention is required. It is necessary to install a baffle plate in a part of the hopper, which is uneconomical.

[Means for Solving the Problems] The hammering device in the electrostatic precipitator of the present invention includes a drive motor, a drive arm that is rotationally driven by the drive motor, and a bottle that is rotatable through the drive arm. , a hammer 7-m rotatably connected to the intermediate arm via a pin, and a hammer attached to the tip of the hammer arm; The motor for use is a reversible motor,
The hammer is installed between two electric field dust collecting plates and successively hammers the dust collecting plate, and further includes a controller for controlling forward or reverse rotation of the reversible motor. Another feature is that a kicker is attached so that it hits the center of the anvil, α.

[Example] An embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows the main parts of the hammering mechanism of the hammering device according to the present invention. The four drive shafts of the hammering device 7-10 are fixed with through bolts, keys, or the like. An intermediate arm 5 is rotatably connected to the end opposite to the fixed end of the drive arm 10 by a pin 5'.

A hammer 7-arm 6 is also rotatably connected to the other end of the intermediate arm 5 by a pin 6'. A hammer 7 is attached to the other end of the hammer arm 6. In the state shown in FIG. 3, the pin 6'' is in contact with the side edge of the drive arm 10, and the pin 5' is in contact with the side edge of the hammer arm 6.

In addition, in FIG. 3, when the drive arm lO rotates in the direction of the arrow, the angle a formed between the drive arm 10 and the horizontal line is
becomes smaller, and accordingly, the angle β between the central axis of the hammer 7-me 6 and the perpendicular line from the ffi center G of the hammer 7 becomes smaller.

When the angle β becomes 0 degrees, the contact pressure of the hammer arm 6 against the pin 5' at point F becomes 0, and when it exceeds this, the hammer arm 6 and the hammer 7 lose their balance and are in the same direction as the rotation direction of the drive arm 10. Rotate in the direction of.

FIG. 2 is an explanatory diagram for explaining the hammering of the dust collecting plate according to this embodiment.

In FIG. 2, when the drive arm 10 rotates in the direction of the arrow, the drive arm 10, the intermediate arm 5, and the hammer arm 6 assume a left position, an upper position, a right position, and a lower position. They will each occupy the positions indicated by the imaginary lines.

When the drive 7-me 10 further rotates from the state indicated by the solid line,
At a certain position, the hammer arm 6 and the hammer 7 rotate under their own weight and strike the anvil 8 and the shocker 9 with a hammer.

In this way, when the drive arm 10 rotates to the right (clockwise), the dust collecting plate 1 on the left side in FIG. When the arm 10 rotates, the dust collecting plate 1' on the right side in Fig. fi2 is hammered (no hammering at t51 rotation, hammering from the second rotation).

That is, when rotating clockwise, the left dust collecting plate 1 is hammered, and when rotating counterclockwise, the right dust collecting plate 1'' is hammered once every time the drive shaft 4 rotates once. Rotate).

In the above-mentioned crosspiece structure, if the hammer arm 6 and the hammer 7 lose their balance and rotate under their own weight, and the rotational speed of the drive arm is high when hammering the anvil 8 and the shocker 9 (usually 1 rotation per minute), or if there are large variations in the machining accuracy of the intermediate arm 5 and the hammer 7 and the installation accuracy of the position of the anvil 8, the hammer 7 will not hit the center point of the anvil 8 and will come off greatly. As a result, a problem may arise in that the hammering force of the hammer 7 is not sufficiently transmitted to the shocker 9.

In order to solve this problem, a kicker 12 is attached to the end of the dust collecting plate 1, and when the hammer 7 hits the kicker 12, the balance is forcibly lost, and the anvil 8 is rotated by its own weight to accurately move the anvil 8. It is possible to design it to be hammered.

FIG. 1 is a sectional view of the entire state in which this embodiment is installed in an electrostatic precipitator. The part surrounded by dotted lines is the hammering device.

Compared to the case in Figure tlS4, the length (L) of the electrostatic precipitator can be shortened to (L').

Under normal operating conditions, the drive shaft is located in the dust collector (front chamber) on the left side.
Rotate clockwise 2 to 3 times for hammering, and remove the dust collector on the right side (
For hammering of the rear chamber), rotate at a rate of one rotation to the left.

In addition to the hammering device, the electrostatic precipitator has many drive devices such as the drive of the inlet/outlet log pump and the drive of the dust discharge device, so sequencer controllers have recently been widely used to control them.

Even with a small sequencer controller, there are too many input and output units to control the entire electrostatic precipitator, so the extra units are used to control the reversible motor.

Since it is a sequencer controller, forward/reverse rotation and timing can be easily performed using only software.

[Effects of the Invention] (1) One hammering device can hammer two electric field dust collecting plates.

Therefore, ・The cost of the hammering device is almost halved.

・The number of penetration parts of the drive shaft in the casing is reduced, and the number of leakage parts of the bus is reduced.

- There is no need to hit the dust collecting plates of two electric fields at the same time.

(2) In Figure 2, the trajectory of the hammer becomes B#i,
The protrusion amount l of the anvil and shocker from the dust collection plate is normally about 50 f6.

Therefore, ・It is possible to ship the shuttle bar to the roof after it is assembled at the factory. In other words, on-site construction work is reduced and quality is improved.

(3) IT's reversible motor and sequencer control make it possible to easily program the two electric field dust collector plates to the required cycle, and use the excess input/output of the sequencer control, eliminating extra costs. There are no occurrences.

- The space can be significantly reduced because there is one set of hammering devices for two electric fields, the amount of protrusion of the anvil is reduced, and the space between the two electric fields is effectively used. Therefore, the installation area of the device is reduced.

・Singing and insulation work will be reduced.

・If installed indoors, building costs will be reduced.

(4) Since the hammering device is installed in the center, the gas leak prevention baffle plate can be made smaller.

(5) By attaching a puncher, it is also possible to easily make the hammer hit the center point of the anvil.

As a result, high processing precision and installation precision are not required.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electrostatic precipitator employing a hammering device according to the present invention, Figs. 2 and 3 are detailed explanatory views thereof, and Fig. 4 is a sectional view of a conventional electrostatic precipitator. FIG. 5 is a detailed explanatory diagram thereof. 1.1゛...Dust collecting plate, 2,2'...Dust collecting plate hammering device, 3...Gas rectifying plate, 4...Drive shaft, 5...Intermediate arm, 5'' ...Pin, 6...Hammer arm, 6
'...pin, 7...hammer, 8...anvil,
9...Shimikku bar, 10...Drive arm, 11...
...Horizontal beam, 12...Kitsuka. The patent applicant is located at the bottom of Figure 2 of Prius Corporation in Figure 3.

Claims (1)

[Claims] 1. A drive motor, a drive arm rotationally driven by the drive motor, an intermediate arm rotatably connected to the drive arm via a pin, and a pin connected to the intermediate arm. 1. A hammering device for an electrostatic precipitator, comprising a hammer arm rotatably connected via a hammer arm, and a hammer attached to the tip of the hammer arm. 2. Hammering in the electrostatic precipitator according to claim 1, wherein the driving motor is a reversible motor, is installed between two electric field dust collecting plates, and hammers the dust collecting plates sequentially. Device. 3. The hammering device for an electrostatic precipitator according to claim 2, further comprising a controller that controls the reversible motor to rotate forward or reverse. 4. The hammering device for an electrostatic precipitator according to claim 1, 2 or 3, wherein a kicker is attached so that the hammer hits the center point of the anvil.