KR900003731B1 - Dust collecting apparatus for electric furnace - Google Patents

Abstract

A dust collecting apparatus for electric furnace includes a working hole (2) and an outflow hole at each side of a body (1). A side ring duct (6) with an air curtain device having a pipe ring for inflowing air is provided around the ceiling (4) of the body. An electrode (16) is inserted into the ceiling of the body, and an economizer (17) is provided between the electrod and the ceiling. The air curtain device is disposed on the upper of the gap, and the side ring duct is connected to a main duct (11) and a rear duct.

Description

Dust collector of electric furnace

1 is a side configuration diagram of a part of a conventional direct collection method of dust collection device.

2 is a configuration diagram of a dust collecting device of the conventional dry house dust collecting method.

3 is a configuration diagram of a dust collecting device of a conventional canopy hood method.

4 is a perspective view of the present invention with a part omitted.

5 is a plan view of the present invention.

6 is a cross-sectional view taken along the line A-A of FIG.

7 is a cross-sectional view taken along line B-B in FIG.

8 is an enlarged cross-sectional view of the "C" portion of FIG.

9 is an enlarged cross-sectional view of part "D" of FIG.

10 is an enlarged cross-sectional view of an "E" portion of FIG.

* Explanation of symbols for main parts of the drawings

1: body 2: work tool

3: hot water outlet 5: piping

6: side ring Doc 7: rear hood

8 rear duct 9,12 flow control damper

10: Front door 11: Main Doc

13: flange l4: sliding door

16: electrode 17: economizer

18: Piping.

According to the present invention, when oxygen blowing (CO2-Blowing) or oxygen cutting (CO2-Cutting) is performed in an electric furnace (especially an arc furnace), dust and smoke generated in an explosive manner at the peak time are outside the main body of the electric furnace. The present invention relates to a dust collecting device of an electric furnace that allows the entire amount of dust to be collected without leaking into the furnace. In particular, an air curtain device is provided on the side ring duct of the electric furnace body and the economizer on the ceiling surface of the electric furnace body Wherein, the side ring duct is a dust collection device that is connected to the main duct and the rear duct connected to the normal dust collector which is suctioned by the discharge pressure of the blower (Direct Suction Type), dry dust collecting method Canopy Hood Type, and the direct wicking type, as shown in Fig. 1, installs a dust collecting pipe by drilling a hole in the wall or ceiling of the main body of the electric furnace and connects it to the dust collecting facility. It is the most reliable collecting device by suction method, but this requires a large-capacity dust collector and a gas cooling tower must be installed. The dust collection method is a method of enclosing the entire building in which the electric furnace is installed as shown in FIG. 2, which requires a large amount of dust collection equipment, and also has the disadvantage of damaging the health of indoor workers during structural change and work of the basic factory building. The last canopy hood method is a method of collecting dust at a place where dust is exploded by installing a fixed or movable hood as shown in FIG. 3, which is dust-collected because a large amount of fresh air is introduced during dust collection. The capacity of the facility increases 3-4 times compared to the two methods mentioned above, while the dust collection efficiency is Because much of the outflow can be expected only about 50-70% and there was a problem that the driving cost is much higher.

The present invention is to solve this problem is that the dust generated intensively during the operation to the outside of the main body of the air is suppressed by the air to continue to fill in the main body, after which the normal bag filter (Bagfilter) through the main duct and the rear duct The purpose is to significantly improve the dust collection efficiency by collecting suction as a built-in dust collector.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. In an electric furnace in which a working tool 2 is formed on one side of the main body 1 and a tapping hole 3 is formed on the other side, piping for introducing air into the upper and lower parts of the inner periphery of the ceiling 4 joining surface of the electric main body 1 is performed. An air curtain device formed of (5) is installed, and a side ring duct (6) is provided, and a rear duct (8) having a rear hood (7) formed on the lower end of the hot water outlet (3) is provided. ) Inside the work flow control damper (9), the upper side of the work tool (2) is installed a main duct (l1) with a front door (1) at the bottom, built-in bag filter for suction operation by the discharge pressure of the blower It is connected to a conventional dust collector (not shown), but the flow control knob 12 is installed inside the main duct (11). In addition, a flange 13 is formed at one end of the upper side of the main duct 11 to form a sliding door 14 so as to correspond to this, and an ordinary electrode 16 is inserted into the ceiling of the electric furnace main body 1 so that the electrode rod ( 16) and the economizer (17) is installed to prevent dust that is ejected even in the gap of the hole (15) of the upper surface of the ceiling (4), but the air curtain device formed of the piping 18 on the upper surface In the drawings, reference numeral 19, a metal case, 20 is an asbestos plate, 21 is a gantry, and 22 is another pipe through which air is introduced.

In the present invention configured as described above, a large amount of dust generated in the first melt of the electric furnace is exploded explosively as shown in FIG. 6 and severely hits the ceiling 4 in the electric furnace main body 1, and is only layered in the main body. The filled dust is allowed to flow out into the gap between the electrode rod l6 and the hole 15, the contact portion of the ceiling of the main body 1, the gap of the work tool 2, and the like. The main duct 11 and the rear duct which flow in the main body 1 and penetrate the main body 1 and the dust collection period by the suction power of a conventional dust collector (not shown) which are sucked by the discharge pressure of the blower in this state. Through (8) it is collected into the dust collector and filtered by the bag filter.

In more detail, the air curtain device on the economizer 17, that is, the pressure of the air flowing into the pipe 18, is higher than the pressure of the dust flowing into the gap between the electrode rod 16 and the hole 15. As shown in the figure, the dust (flowing in the direction of the dashed arrow) that flows out is not pushed out by the pressure of the air (in the direction of the solid arrow) that flows in, and the main body 1 continues to flow. The dust (dotted arrow direction) that is about to flow out into the contact portion of (4) is also blocked by the inner surface of the side ring duct 6 as well as being pushed by the pressure of the air (solid arrow direction) flowing in as shown in FIG. As shown in FIG. 10, the dust (dotted arrow direction) that is not allowed to flow out and flows inside the main body 1 and flows into the gap of the work tool 2 is also affected by the pressure of the air (solid arrow direction) that flows in as shown in FIG. Pushed up into the main doc (11) There is no outflow to the outside of the main body (1), and in this state is discharged through the main duct (11) and the rear duct (8) interconnected by the suction force of the dust collector acting suction by the discharge pressure of the blower is almost perfect in the dust collector (95 or more) is collected and the dust collection efficiency is greatly improved. Also, a heat exchanger is installed in the main doctor 11 interconnecting the electric furnace main body 1 and the dust collector to remove waste heat in the main body 1. If it is recovered, it is possible to preheat the scrap metal or supply hot water.

In this case, the operation of the flow control damper 9 (l2) and the sliding door 14 in the description of the present invention is general, and thus a detailed description thereof is omitted.

The present invention as described above is expected to be almost perfect dust collection efficiency to keep the indoor air clean, there is no fear of harming the health of workers around the electric furnace, of course, there is no capacity limitation can be applied to the usual dust collector as it is minimal dust collection The maximum dust collection efficiency can be obtained by the equipment, and the conventional dust collector can be retrofitted into the apparatus at low cost, and the effect achieved by the present invention is very large.

Claims (1)

In an electric furnace in which a working tool 2 is formed on one side of the main body 1 and a tapping hole 3 is formed on the other side, piping for introducing air into the upper and lower parts of the inner periphery of the ceiling 4 joining surface of the electric main body 1 is performed. A side ring duct (6) having an air curtain device formed of (5) is installed, and an ordinary electrode rod (16) is inserted into the ceiling of the electric furnace body (1), and the electrode rod (16) and the upper surface of the ceiling (4) are installed. The economizer 17 is installed in the gap of the hole 15, and the upper surface of the air curtain device is formed by the pipe 18. The side ring duct 6 is suctioned by the discharge pressure of the blower. Dust collection device of the electric furnace, characterized in that connected to the main duct (11) and the rear duct (8) connected to the dust collector.

Images