JPH0652154B2 - Cleaning device for dust collection duct of melting furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cleaning device for a dust collecting duct of a melting furnace or a refining furnace.

(Prior Art and Problems Thereof) A dust collecting system of a melting furnace, for example, an arc furnace is configured as shown in FIG. 6, and dust generated from the arc furnace 1 is sucked by a suction force of a dust collecting device (not shown), Through the horizontal duct 2, the combustion tower 3, the horizontal portion 4, and the vertical portion 5, the dust is guided to the dust collector for processing.

However, in this type of dust collector, dust and the like adhere to and accumulate on the lower portion of the horizontal duct 2 and the lower portion and side wall of the combustion tower 3, and a part of them is removed only by the suction force of the dust collector. However, it is said that it adheres to each part of the horizontal duct 2, the combustion tower 3, etc., and that it accumulates, and the dust collection capacity of the dust collector decreases, which hinders the operation of the arc furnace 1. There's a problem.

Therefore, the operation of the furnace is stopped, or dust and the like adhered and deposited on the side walls of the horizontal duct 2 and the combustion tower 3 are manually removed when the furnace is repaired, and dust and the like accumulated on the lower portion of the combustion tower 3 are appropriately cleaned. The mouth is opened and the work is manually scraped to remove it.

However, stopping the operation of the arc furnace 1 to remove the dust lowers the operation rate of the arc furnace 1 and also requires human power under a bad environment such as the horizontal duct 2 and the combustion tower 3. There is a problem that the work of removing dust and the like is extremely severe.

The present invention has been made in view of the above points, and provides a cleaning device for a dust collection duct of a melting furnace configured to remove dust and the like in a horizontal duct of a dust collection system and a combustion tower by mechanical force. It is intended.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a window is provided on a side wall of the dust collector of a melting furnace including a horizontal duct and a combustion tower, the side wall facing the horizontal duct of the combustion tower. And a door for opening and closing the window, and a raking device that is inserted into the horizontal duct from the window when the door is opened to scrape dust in the duct into the combustion tower, and the combustion tower. A carrying-out device, which is arranged in the lower part of the inside and carries out the falling dust, is carried out to the outside of the tower.

(Function) When the raw material is put into the melting furnace, the furnace lid is swung, and the door of the combustion tower is opened at the timing when the high temperature gas in the furnace does not flow into the horizontal duct, and the scraping device is inserted into the horizontal duct. Dust etc. that stick to and accumulate in the horizontal duct is scraped out and scraped into the combustion tower. The scraped dust and the like are carried out of the combustion tower by a carry-out device.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a dust collecting system to which the cleaning device according to the present invention is applied. The same parts as those of the dust collecting system shown in FIG. In FIG. 1, a window 3b larger than the opening 2a of the horizontal duct 2 is formed in a side wall 3a of the combustion tower 3 at a position facing the horizontal duct 2, and the side wall 3a is a door for opening / closing the window 3b. 7 is provided so that it can be opened and closed by rotating upward. The door 7 can be held in an open state as shown by a locking mechanism (not shown).

A pair of rails 8 are provided at a predetermined height position between the side wall 3a of the combustion tower 3 and the side wall 5a of the vertical portion 5 that faces the side wall 3a, and between the horizontal portion 4 and the window 3b. A carriage 11 of the raking device 10 is arranged on the rail 8 so as to be movable in a horizontal duct direction or an anti-horizontal duct direction indicated by an arrow A or B. The carriage 11 is moved by a motor (not shown) mounted on the carriage. An extendable and retractable arm 12 is mounted on a dolly 11, and the arm 12 is an arm base 1
3 and a plurality of, for example, three short arms 14 to 16. The arm 14 is arranged on the base 13, the arm 15 is arranged on the arm 14, and the arm 16 is arranged so as to be capable of expanding and contracting horizontally with respect to the arm 15. The arms 14 to 16 are respectively controlled to expand and contract by a drive mechanism not shown. These arms 14 to 16 are controlled at double speed. A scraping member such as a rake 17 is attached to the tip of the arm 16.

The arm 12 is arranged at a height position where it can be inserted horizontally into the horizontal duct 2 through the window 3b of the combustion tower 3, and its length is a predetermined value such that the carriage 11 is close to the side wall 3a of the combustion tower 3 as shown by a solid line. When the arm 14 is stopped at the position and each of the arms 14 to 16 is completely extended, a part of the arm 15 and the arm 16 are inserted into the horizontal duct 2, and the rake 17 attached to the tip of the arm 16 is the horizontal duct. The length is set to be located at the opening end 2b of No. 2.

As shown in FIG. 2, in the rake 17, a raking part composed of a large number of wires 18 is vertically provided on the lower surface of the support rod 17a.
A bracket 17b, which is provided so as to project substantially in the center of the upper surface of 7a, is rotatably supported by the tip of the arm 16 via a pin 19. When the rake 17 is inserted into the horizontal duct 2, the rake 17 is allowed to freely rotate toward the arm 16 shown by the arrow C as shown in FIG. 3, and when it is scraped out, it is moved toward the tip of the arm 16 shown by the arrow CC in FIG. The rotation is locked at a predetermined angular position which is slightly inclined to the arm 16 side from the hanging position as shown in the figure, and the tip of the wire 18 contacts the bottom surface 2c of the horizontal duct 2 in this state.

The rake 17 moves out of the combustion tower 3 through the window 3b in a state where the carriage 11 has moved in the direction of arrow B in FIG. 1 to a predetermined position indicated by a chain double-dashed line and the arms 14 to 16 have been completely shortened. And is separated from the side wall 3a, so that the door 7 can be closed.

As shown in FIG. 5, the bottom surface 3c of the combustion tower 3 inclines downward toward the center in a substantially V-shaped cross section, and in the groove 3d at the center, a unloading device such as a scrape conveyor 2 is provided over the entire length in the longitudinal direction.
0 is stored. One side unloading end 20a of the screw conveyor 20 projects out of the tower through a discharge port 3e provided on the side wall 3a, and the rotary shaft 21 has a shaft hole 3 formed in the side wall 3a '.
It is inserted through f, projects outside the tower, and is connected to the output shaft of the speed reducer 22. The input shaft of the speed reducer 22 is connected to the rotary shaft of the drive motor 23.

The operation will be described below.

When the arc furnace 1 is in operation, the window 3b of the combustion tower 3 is closed by the door 7, and the dust or the like discharged from the arc furnace 1 is sucked by the suction force of the dust collector (not shown) to make the furnace top elbow. 1b, through the horizontal duct 2 to the combustion tower 3, where carbon monoxide (Co) and the like is burned by the combustion tower, and thereafter, the carbon monoxide (Co) is guided to the dust collector through the horizontal portion 4 and the vertical portion 5 for treatment.
Dust and the like adhere to and accumulate on the lower portions of the horizontal duct 2 and the combustion tower 3. At this time, the scrub conveyor 20 is driven to carry out dust and the like falling into the combustion tower 3 to the outside of the bag 3
5, or the scrape conveyor 20 may be stopped.

When the furnace lid 1a of the arc furnace 1 is swung when the raw material is charged into the arc furnace 1, the furnace top elbow 1b is also swung integrally and separated from the horizontal duct 2. The horizontal duct 2 is cleaned using this timing. That is, the door 7 of the combustion tower 3 is opened as shown in FIG. 1, the carriage 11 of the raking device 10 is moved to the position shown by the solid line, and the arms 14 to 16 are extended to open the window 3b and the horizontal duct 2. Insert into the horizontal duct 2 from the end 2a. When the arms 14 to 16 are inserted into the horizontal duct 2, the rake 17 rotates as shown by an arrow C in FIG. 3 and moves on the dust 30 fixedly deposited on the bottom surface 2c of the horizontal duct 2.

When the arm 12 is completely extended, the rake 17 is located at the open end 2b of the horizontal duct 2 as shown in FIG. Then, when the arms 14 to 16 are shortened, the rake 17
Is locked as shown in FIG.
The dust 30 fixedly deposited on c is scraped out and scraped into the combustion tower 3 through the opening end 2a. At this time, the screw conveyor 20 is rotated by the motor 23. Dust and the like that fall into the combustion tower 3 slide down toward the groove 3d by the inclined bottom surfaces 3c and 3c, are carried out to the discharge port 3e by the scrap conveyor 20, and are discharged into the bag 35 from the discharge port 3e.

Each of the arms 14 to 16 of the arm 12 is expanded and contracted once or several times to remove dust and the like that are fixedly deposited in the horizontal duct 2. After the cleaning of the horizontal duct 2, the trolley 11 is moved in the direction of arrow B to the position indicated by the chain double-dashed line while the arm 12 is being shortened, and the window 3b is closed by the door 7.

The raw material of the arc furnace 1 is charged during the cleaning of the horizontal duct 2, and after the cleaning is completed, the furnace lid 1a of the arc furnace 1 is swung to set it at a fixed position. As a result, the furnace top elbow 1b is brought into communication with the horizontal duct 2 again, and the arc furnace 1 can be operated.

In addition, in the present embodiment, the case where the opening / closing of the door 7 of the combustion tower 3, the scraping operation of the scraping device 10, the driving of the scribing conveyor 20 and the like are performed separately has been described, but the present invention is not limited to this. Even if the raw material charging operation of the furnace 1, that is, the turning operation of the furnace lid 1a of the arc furnace 1 is interlocked, the opening / closing of the door 7, the operation of the scraping device 10, the driving of the scrap conveyor 20, and the like are sequence-controlled. Good.

Further, in this embodiment, the cleaning of the horizontal duct of the dust collecting system of the melting furnace was described, but the present invention is not limited to this.
Of course, it can be applied to the cleaning of horizontal ducts of dust collecting systems such as other refining furnaces.

(Effect of the invention) As described above, according to the present invention, a window is formed in a side wall of a dust collector of a melting furnace including a horizontal duct and a combustion tower, the side wall facing the horizontal duct of the combustion tower, and A door that opens and closes the window is provided, and a raking device that is inserted into the horizontal duct from the window when the door is opened to scrape off dust in the duct into the combustion tower, and is provided in a lower portion inside the combustion tower. Since it is equipped with a carry-out device that carries out falling dust to the outside of the tower, unmanned cleaning of the horizontal duct in adverse environments can be performed and the work can be shortened. There is an excellent effect that the melting rate can be improved and the operation rate of the melting furnace can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a dust collecting system of a melting furnace to which a dust collecting duct cleaning device according to the present invention is applied, FIG. 2 is a front view of a rake shown in FIG. 1, and FIG. The figure which shows the state which inserts the arm and rake of a scraping device in a duct, FIG. 4 is a figure which shows the scraping operation of dust, FIG. 5 is the arrow VV sectional drawing of FIG. 1, and FIG. It is sectional drawing which shows the dust collection system of the conventional melting furnace. 1 ... Arc furnace, 2 ... Horizontal duct, 3 ... Combustion tower, 3b ...
Window, 4 ... Horizontal part, 5 ... Vertical part, 7 ... Door, 10 ... Rubbing device, 12 ... Arm, 17 ... Rake, 20 ... Skew conveyor, 22 ... Reducer, 23 ... Motor.

Claims (1)

[Claims] 1. A smelting furnace dust collector having a horizontal duct and a combustion tower has a window formed in a side wall of the combustion tower facing the horizontal duct, and a door for opening and closing the window is provided, and a door is opened. Occasionally, a scraping device that is inserted into the horizontal duct through the window to scrape dust in the duct into the combustion tower, and a discharging device that is disposed in the lower portion of the combustion tower and discharges the falling dust to the outside of the tower. And a cleaning device for a dust collection duct of a melting furnace.