JP2004163063A - Hopper for dust collector dust - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hopper for dust of a dust collector capable of preventing bridging of dust in the hopper so as to certainly discharge the dust when much dust falls due to pulse jet, reverse washing, or the like in the hopper for dust of the dust collector and also when a large lump mixes into the dust. <P>SOLUTION: The hopper for dust of the dust collector is installed in the lower part of the dust collector for exhaust gas of an electric furnace and is used for storing the dust, and has a conical or pyramidal shape. The inside of the hopper is provided with a dust loosening device having a rotating blade. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dust collector dust hopper which is installed below an exhaust gas dust collector of an electric furnace used for melting a metal material, refining a molten metal, and storing dust.
[0002]
[Prior art]
Conventionally, as a dust clogging prevention device for dust collectors and dust collectors for electric furnace exhaust gas, a method of attaching a vibration generator to the side surface of the hopper, vibrating the hopper side surface, and dropping and discharging dust by the vibration is generally used. Was used.
This vibration generator has a small amount of dust falling on the hopper, and is effective in separating dust adhering to the side surface of the hopper when dust is not stored in the hopper.
[0003]
However, in actual operation of the exhaust gas dust collector, the amount of dust that greatly exceeds the discharge speed of the dust discharge device attached to the filter installed at the top of the dust collector falls into the hopper due to pulse jet or backwashing. There is.
In addition, when dust adhering to the inner surface of the exhaust gas duct or the inner surface of the hopper is solidified and the solidified dust is separated due to vibration, thermal expansion, or the like, a large amount of dust is often mixed with the dust stored in the hopper of the dust collector.
The large amount of dust accumulated in the hopper, which significantly exceeds the discharge speed of these dust discharge devices, promotes shelving of the dust in the hopper, which is compacted by the vibrating device, resulting in a large amount of dust clogging.
[0004]
In addition, the large lump mixed into the dust collected in the dust collector hopper promotes the shelving of the dust in the hopper and causes dust clogging.
Further, moisture in the dust also promotes shelving of the hopper by dust in the hopper, causing dust to be clogged.
To solve this problem, Japanese Patent Application Laid-Open No. 5-49969 discloses a dust collector provided with a dust drying plate.
However, this prior art is effective when shelves are hanging due to a large amount of moisture, but when a large amount of dust is dropped by pulse jet or back washing as described above, When large lumps were mixed, dust clogging often occurred.
[0005]
In Japanese Utility Model Laid-Open Publication No. 6-81643, a reverse spiral screw conveyor is disposed below a dust collecting hopper of an electric dust collector, and the screw conveyor is rotated to scrape dust to form an inner wall of the dust collecting hopper. There is disclosed a dust discharging device that separates and breaks down dust that is fixed on a shelf.
However, this prior art is directed to an elongated triangular prism-shaped hopper, not a cone or pyramid-shaped hopper, which is the object of the present invention, and scrapes and discharges dust by a screw conveyor installed at the lower part of the hopper. This was the target device, and the effect of preventing dust hanging by stirring the dust was insufficient.
[0006]
[Patent Document 1] JP-A-5-49969 [Patent Document 2] JP-A-6-81643
[Problems to be solved by the invention]
Therefore, the present invention reliably discharges dust even when a large amount of dust has fallen due to pulse jet, backwash, or the like in a dust collector dust hopper, or when a large lump is mixed in the dust. It is an object of the present invention to provide a dust collector dust hopper capable of preventing the dust from being racked in the hopper.
[0008]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist thereof is as described below in the claims.
(1) A dust collector dust hopper that is installed under an exhaust gas dust collector of an electric furnace and stores dust,
The shape of the hopper is a cone or a pyramid,
A dust collector dust hopper comprising a dust loosening device provided with rotating blades inside the hopper.
(2) The dust collector according to (1), wherein the dust loosening device is installed within a range of a height of 1.5 m from an upper end of a dust discharging device disposed below the hopper. hopper.
[0009]
(3) The dust collector dust hopper according to (1) or (2), wherein a rotary driving device of the dust release device is shared with a driving device of the dust discharge device.
(4) The dust collector dust hopper according to any one of (1) to (3), wherein a plurality of the dust loosening devices are installed.
(5) The ratio of the projected area of the dust-releasing portion to the passage area of the rotating blades of the dust-releasing device is 50% or less, wherein (1) to (4). Dust collector dust hopper.
(6) The dust collector dust hopper according to any one of (1) to (5), wherein a vibration generator is provided on a side surface of the hopper.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a vertical sectional view of a dust collector dust hopper in which a dust loosening device of the present invention is arranged.
FIG. 2 is a diagram showing a comb-shaped blade as an example of the shape of the rotating blade of the dust loosening apparatus used in the present invention.
FIG. 3 is a diagram showing a rake-shaped blade as an example of the shape of the rotating blade of the dust loosening device used in the present invention.
FIG. 4 is a longitudinal sectional view of a dust collector dust hopper in which the dust loosening device of the present invention is disposed, in the blade rotation axis direction.
FIG. 5 is a longitudinal sectional view in the blade rotation axis direction of the embodiment in which the driving device of the dust discharge device used in the dust hopper for dust collector of the present invention is shared with the driving device of the dust loosening device.
[0011]
In FIG. 1, dust 1 collected by a dust collector (not shown) is stored in a hopper 2 having a cone or pyramid shape, and is discharged out of the hopper by a dust discharge device 3.
However, dust adhering to the filter installed on the upper part of the exhaust gas dust collector may drop in large quantities due to pulse jet or backwashing, and the amount of dust at this time greatly increases the discharge speed of the discharge device 3. Therefore, the dust 1 stored in the hopper 2 forms a shelf hanging.
[0012]
Therefore, in the present invention, the blades 4 rotating about the rotation shaft 5 loosen the dust 1 so that the hanging of the shelf is eliminated and the dust 1 is reliably discharged out of the hopper.
The rotation speed of the blade 4 is preferably in the range of 2 rpm to 12 rpm because the frictional resistance of the dust increases when the rotation is low and the torque increases when the rotation is high.
Further, since the shelf hanging by the dust 1 occurs within a range of a height of 1.5 m from the upper end of the dust discharge device 3, it is preferable to set the passage range of the blade in that range.
Note that, as the dust 1 comes closer to the dust discharge device 3, shelf hanging of the dust 1 easily occurs. Therefore, it is preferable that the passing range of the blade 4 of the dust loosening device of the present invention be closer to the upper end of the dust discharge device 3. Also, arranging a plurality of the dust loosening devices of the present invention within a range of a height of 1.5 m from the upper end of the dust discharging device 3 is effective for preventing the dust 1 from being racked.
[0013]
Further, in FIG. 1, the rotating blade 4 is hollow.
Further, in FIG. 2, the blades 4 have a comb shape, and in FIG. 3, the blades 4 have a rake shape.
If the blade 4 is made into a plate shape or a screw shape, for example, and the contact area with the dust 1 is increased, the frictional resistance with the dust and the increase in the amount of pushing out the dust increase the torque, and a large power is required. Not preferred.
On the other hand, as shown in FIGS. 1 to 3, by arranging a space where the dust 1 escapes in the passage range of the blade 4, the frictional resistance with the dust 1 is reduced, and the amount of the dust pushed by the blade 4 is reduced. Thus, the required torque can be reduced, and the shelving state of the dust 1 can be effectively eliminated with less power.
Specifically, the hollow blade of FIG. 1, the comb shape of FIG. 2, and the rake shape of FIG. 3 are preferable. In any case, in order to reduce frictional resistance with dust and to reduce the amount of dust pushed by the blade. In this case, it is preferable that the projected area of the portion for loosening the dust of the blade is 50% or less of the passage area of the blade.
[0014]
In FIG. 4, the device 6 for driving the blade rotation of the dust loosening device of the present invention is disposed separately from the driving device 7 for the dust discharge device.
In FIG. 5, a blade rotation driving device 6 of the dust loosening device of the present invention is shared with a driving device 7 of the dust discharge device 3. By sharing the driving equipment, the number of driving equipment can be reduced to １ ／ or less, which leads to a reduction in equipment cost.
Furthermore, in addition to the dust loosening device of the present invention, by attaching the vibration generating device 8 for promoting the separation of the dust 1 on the inner surface of the hopper 2 to the hopper 2, the dust 1 adhered to the inner surface of the hopper 2 can be reliably discharged. This is very effective in discharging dust 1.
[0015]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, when a large amount of dust falls by pulse jet, backwashing, etc. in a dust collector dust hopper, and when a large lump is mixed in the dust, dust is reliably discharged. Thus, it is possible to provide a dust collector dust hopper capable of preventing the dust from being shelved in the hopper, and has the following industrially significant effects.
[0016]
1) By attaching the dust loosening device to the conical and pyramid-shaped hoppers of the electric furnace dust collector, it becomes possible to prevent the hopper from hanging on the shelves, thereby reducing maintenance staff and costs, and also preventing interruption of operation. be able to.
2) Further, by attaching the vibration generator to the hopper, the dust in the hopper can be reliably discharged.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a dust collector dust hopper in which a dust loosening device of the present invention is arranged.
FIG. 2 is a view showing a comb-shaped blade as an example of the shape of a rotating blade of the dust loosening apparatus used in the present invention.
FIG. 3 is a diagram showing a rake-shaped blade as an example of the shape of a rotating blade of the dust loosening apparatus used in the present invention.
FIG. 4 is a longitudinal sectional view of a dust collector dust hopper in which a dust loosening device of the present invention is disposed, in a blade rotation axis direction.
FIG. 5 is a longitudinal sectional view in the blade rotation axis direction of an embodiment in which a driving device of a dust discharging device used in a dust collector dust hopper of the present invention is shared with a driving device of a dust loosening device.
[Explanation of symbols]
1: dust,
2: Hopper,
3: dust discharging device,
4: feather,
5: rotating shaft,
6: Dust loosening device rotation drive equipment,
7: Dust discharge device driving device,
8: Vibration generator

Claims (6)

A dust collector dust hopper installed under the exhaust gas dust collector of an electric furnace to store dust,
The shape of the hopper is a cone or a pyramid,
A dust collector dust hopper comprising a dust loosening device provided with rotating blades inside the hopper. 2. The dust collector dust hopper according to claim 1, wherein the dust loosening device is installed within a range of a height of 1.5 m from an upper end of a dust discharging device disposed below the hopper. 3. 3. The dust collector dust hopper according to claim 1, wherein a rotary driving device of the dust loosening device is shared with a driving device of the dust discharge device. 4. The dust collector dust hopper according to any one of claims 1 to 3, wherein a plurality of the dust loosening devices are installed. The dust collector dust according to any one of claims 1 to 4, wherein a ratio of a projected area of a dust-releasing portion to a passing area of a rotating blade of the dust-releasing device is 50% or less. For hopper. The hopper for dust collector dust according to any one of claims 1 to 5, wherein a vibration generator is provided on a side surface of the hopper.

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