KR100889502B1 - Method and Device for treatmenting dust in refining furnace - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a heavy dust treatment method and an apparatus of a refining furnace that can reduce the cost and workload for heavy dust treatment by collecting heavy dust discharged from the refining process and reloading the heavy dust. .

Therefore, the present invention is rotatably installed on the upper deck of the skimmer facility, the inlet is formed in which the heavy dust flows into the upper end of the one side and the outlet is formed to discharge the heavy dust in the lower end of the other side, the transfer for moving the heavy dust inside A screw is installed and a driving motor for rotating the transfer screw is installed at a side end thereof, and a heavy dust transfer pipe for supplying heavy dust discharged through a heavy dust transfer line to the ladle; A driving cylinder installed on the deck and connected to a lever extending outwardly of the rotation shaft of the transfer tube to rotate the rotation shaft, wherein the rotation means for selectively positioning the outlet of the transfer tube on the upper ladle is provided. Provided is a heavy dust treatment apparatus for a refining furnace.

Transfer line, transfer pipe, guide chute, blade, drive cylinder, chain

Description

Method and device for treating heavy dust in refining furnace {Method and Device for treatmenting dust in refining furnace}

1 is a view schematically showing a heavy dust treatment line of a refining furnace according to the present invention;

Figure 2 is a perspective view showing a heavy dust treatment apparatus of the refining furnace according to the present invention,

3 and 4 is a partial detailed view of FIG. 2 according to the present invention;

5 is a schematic view showing a heavy dust treatment line of a refining furnace according to the prior art.

Explanation of symbols on the main parts of the drawings

10: Generation duct 20: Transfer line

21: Hopper 22,23: blocking plate

24: outlet 30: deck

40: transfer pipe 41: exit

42: feed screw 43: drive motor

44: rotating shaft 45: support bracket

46: induction chute 50: lever

51: driving cylinder 60: flying pipe                 

61: blade 62,63: pulley

64: bracket 65: chain

The present invention relates to a method and a treatment apparatus for recycling heavy dust generated in a refining furnace, and more particularly, steel scrap and secondary raw materials contained in the dust by collecting and re-injecting dust generated in the refining furnace. It relates to a method for treating heavy dust and its apparatus for recycling.

In general, in order to make a variety of steel from iron ore, it is generally divided into four stages of steelmaking, steelmaking, casting and rolling process. Among these, the iron making process is a process in which iron ore is put in a blast furnace, and coke is burned to remove oxygen in iron ore and dissolve to make pig iron. Pig iron produced through such a steelmaking process has a high carbon content and contains a considerable amount of impurities such as phosphorus (P), sulfur (S), and silicon (Si), and thus has high hardness and brittleness. To make these pig irons stretch well and make them strong, the high-pressure and high-purity oxygen must be blown through the refining process to reduce the amount of carbon and remove harmful impurities.

A process of refining the molten metal from the electric furnace will be described with reference to FIG. 5 as follows.

In order to obtain high quality stainless steel, molten steel tapping from the electric furnace 100 is first subjected to a process of excluding the contents present in the liquid phase on the molten surface of the ladle 110 through the skimmer process to the skimmer facility 120. After roughing is charged into the refining furnace 130 to perform the drilling work.

At this time, a large amount of heavy dust is generated from the refining furnace 130, the heavy dust refers to the fine dust generated in the process of oxidizing the various gases generated during the blown by the proper mixing ratio with air in the atmosphere by high heat.

And the heavy dust is collected through a collecting device 140 on the top of the refinery 130, collected in a separate dust collection box 150 provided on the ground or the heavy dust of a fine size is collected by the dust collector 160 The heavy dust collected by the separate dust box 170 and thus collected and collected is transferred to the by-product treatment facility 190 by the transport truck 180 for reprocessing.

However, the heavy dust is a useful resource containing 35-45% by weight of the Fe component and 50-60% by weight of the CaO component. The above-described conventional heavy dust treatment process results in discarding the raw materials contained in the heavy dust. do.

Considering the fact that heavy dust generated from refinery furnaces is approaching 1800-2000 tonnes per year, the waste of useful resources is increased due to the cost increase of heavy dust treatment and the increase of worker's work intensity due to the increase of by-products. The problem of environmental pollution is getting more serious.

Accordingly, the present invention has been made to solve the above problems, the refining furnace to collect the heavy dust discharged during the refining process and to re-load into the refining furnace to reduce the cost and work load required for heavy dust treatment Its purpose is to provide a heavy dust treatment method and a treatment apparatus.

In order to achieve the object as described above, the present invention is characterized in that the heavy dust generated in the refining furnace is collected and re-injected into the molten ladle in which slag excavation work by the skimmer is in progress.

The heavy dust processing method for this purpose includes collecting heavy dust generated during the refining process, transferring the collected heavy dust to the ladle, and charging the transported heavy dust into the ladle.

In addition, the heavy dust treatment apparatus for the treatment method is installed in the upper deck of the skimmer facility and the heavy dust transfer pipe is connected to one side of the heavy dust transfer line extending to the upper ladle, the transfer pipe is rotated to transfer Pivoting means for selectively positioning the outlet of the tube on top of the ladle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a heavy dust treatment line of a refining furnace according to the present invention, Figure 2 is a perspective view showing a heavy dust treatment apparatus of the refining furnace according to the present invention.

According to the above drawings, the molten metal from the electric furnace 100 is contained in the ladle 110 is transferred to the skimmer process, where the publication floating on the ladle 110 by the skimmer facility 120. After this is removed, it is charged in the refining furnace 130 and blown.

At this time, the heavy dust generated in the refinery 130 is collected by the collecting device 140 installed on the refinery 130, the fine dust is sent to the dust collector 160 through the heavy dust generating duct 10 and the rest Dust is sent to the skimmer process along the transfer line 20.

Heavy dust transferred to the skimmer process is reloaded into the molten metal of the ladle 110 located in the skimmer process through the treatment apparatus of the present invention.

To this end, the heavy dust treatment process of the present embodiment is a step of collecting the heavy dust from the exhaust gas discharged from the refining furnace 130, transferring the collected heavy dust to the skimmer facility 120, the skimmer transported heavy dust Charging into a ladle 110 located in the facility 120.

Since the heavy dust is the same as the molten metal in the ladle 110 in terms of the composition, even if reloaded into the ladle 110 does not affect the molten component and can reduce the cost and effort required to separately process the heavy dust.

On the other hand, the heavy dust treatment apparatus is to properly load the heavy dust transported through the process into the ladle 110, is installed rotatably on the upper deck 30 of the skimmer facility 120, and the heavy dust on one side The transfer line 20 is connected to the heavy dust transfer pipe 40 extending to the upper ladle 110, the transfer pipe 40 is rotated to selectively select the outlet of the transfer pipe 40 on the upper ladle 110 It includes a rotation means for positioning.

The transfer pipe 40 is formed with an inlet (not shown) in which heavy dust flows into one upper end and an outlet 41 through which heavy dust is discharged. In addition, a conveying screw 42 for moving heavy dust is installed inside the conveying pipe 40 and connected to the conveying screw 42 at a side end of the conveying pipe 40 to drive the rotating screw 42. The motor 43 is installed.

In addition, the rotation shaft 44 is vertically installed on the deck 30 for the rotation of the transfer pipe 40, the transfer pipe 40 is horizontal through the support bracket 45 to the rotation shaft 44 It is connected structure.

According to this embodiment, a hopper 21 for storing heavy dust is installed at a lower end of the transfer line 20, and is dropped through an outlet 41 of a hopper 21 at an upper end portion of the transfer pipe 40. Induction chute 46 is installed to correctly receive the heavy dust to the transfer pipe (40).

Reference numerals 22 and 23 are installed in the discharge port 24 of the transfer line 20 and the hopper 21 to block the discharge of heavy dust.

In addition, the outlet 24 of the hopper 21 is the induction chute 46 when the transfer pipe 40 is rotated so that the outlet 41 of the transfer pipe 40 is located above the ladle 110. By setting the installation position so that it can be located in the upper part, continuous heavy dust charging is possible.

The rotation means includes a drive cylinder 51 installed on the deck 30 and connected to the lever 50 extending outwardly to the rotation shaft 44 to rotate the rotation shaft 44.

Accordingly, when the driving cylinder 51 is stretched and operated, the rotation shaft 44 is rotated while the lever 50 is pulled or pushed, and thus the feed pipe 40 installed on the rotation shaft 44 is rotated to ladle 110. It will move to the top.

On the other hand, according to the present embodiment, the heavy dust treatment apparatus further includes scattering means for evenly spreading the heavy dust discharged through the outlet 41 of the transfer pipe 40 on the ladle 110.

To this end, the scattering means is slidably inserted into the outlet 41 of the transfer pipe 40 and vertically lifted up and down the flying pipe 60, and the dust dust is installed along the inner circumferential surface of the flying pipe 60 falls A spiral blade 61 for forming a rotational flow thereon.

In addition, the scattering means is guided by the dows 62 and 63 installed at the exit and entrance of the transfer pipe 40, one end is fixed to the outside of the scattering pipe 60, the other end is on the deck 30 It further includes a chain 65 fixed to the bracket 64 installed, the chain 65 is pulled or released in accordance with the rotation of the transfer pipe 40 has a structure capable of lifting up and down the scattering pipe 60. .

Hereinafter will be described the operation of the present invention.

Heavy dust generated in the refining furnace 130 is reloaded into the ladle 110 located in the skimmer facility 120 through the heavy dust collecting step, the transfer step and the charging step according to the present invention.

At this time, the heavy dust transported through the transport step is dropped into the storage hopper 21 installed at the end of the transport line 20 is stored there.                     

The heavy dust stored in the hopper 21 is re-injected into the upper ladle 110 through the transfer pipe 40 in the charging step.

That is, the molten metal from the electric furnace 100 is contained in the ladle 110 is transferred to the skimmer process and then the exclusion of the upper portion of the molten metal by the skimmer facility 120, the hopper after this process Heavy dust stored in the 21 is added to the upper ladle 110.

Heavy dust input starts with the operation of rotating the transfer pipe 40. When the driving cylinder 51 installed in the upper deck 30 of the skimmer system 120 is contracted and operated, the piston rod end of the driving cylinder 51 is reduced. The rotating shaft 44 connected to the lever 50 via the lever is rotated.

Accordingly, the transfer pipe 40 installed on the pivot shaft 44 via the support bracket 45 moves to the ladle 110 in the tech so that the outlet 41 installed at the end of the transfer pipe 40 is ladle 110. ) Will be placed on top.

In addition to the outlet 41 of the transfer pipe 40 located above the ladle 110, the inlet tip inlet of the transfer pipe 40 is also moved so that the induction chute 46 installed at the inlet is discharged from the hopper 21 ( 24) It is located underneath.

Meanwhile, as the feed pipe 40 installed on the pivot shaft 44 is rotated about the pivot shaft 44, the chain 65 is more than when the first feed tube 40 is positioned on the side of the deck 30. The distance between the fixed bracket (64) and the inner pulley (63) of the transfer pipe (40) is close, so that the chain (65) is drawn outward with respect to the transfer pipe (40) by the corresponding length and the transfer pipe ( The scattering pipe 60 installed at the end of the 40 is lowered with respect to the outlet 41 of the transport pipe 40.

That is, since the scattering pipe 60 is installed at the end of the chain 65, the chain 65 is always being forced by the weight of the scattering pipe 60, so that the transport pipe 40 is rotated toward the bracket. The scattering pipe 60 is to be lowered below the outlet 41.

In this state, when the blocking plate 23 installed at the outlet 24 of the hopper 21 is opened and the driving motor 43 installed at the end of the transfer pipe 40 rotates, the heavy dust falling through the outlet 24 is The inlet chute 46 installed at the inlet of the conveying pipe 40 is introduced into the conveying pipe 40 and is conveyed toward the outlet 41 along the rotating conveying screw 42.

The heavy dust transferred to the outlet 41 of the conveying pipe 40 is dropped through the outlet 41 and passes through the scattering pipe 60 located at the bottom of the outlet 41, and has a spiral blade installed on the inner circumferential surface of the scattering pipe 60. Rotational flow is generated by 61 and is spread while being uniformly spread over the entire upper ladle 110.

According to the heavy dust treatment method and treatment apparatus of the refining furnace according to the present invention as described above, by re-injecting heavy dust directly into the molten metal it is possible to reduce the cost and effort required for heavy dust treatment to lower the cost have.

In addition, it is possible to maximize the warming effect of the molten metal by introducing heavy dust while spreading it stably and uniformly on the surface of the molten metal and inducing efficient heavy dust treatment.

Claims (4)

Collecting heavy dust from the exhaust gas generated during the refining process; Transferring heavy dust collected through the collecting step to a skimmer process; Charging the transported heavy dust into the ladle placed in the skimmer facility Heavy dust treatment method of the refining furnace comprising a. It is rotatably installed on the upper deck of the skimmer facility, an inlet for heavy dust is formed at one upper end, an outlet for heavy dust is formed at the other lower end, and a conveying screw for moving heavy dust is installed at the inner side. A driving motor for rotating the transfer screw at a side end thereof, and a heavy dust transfer pipe for supplying heavy dust discharged through the heavy dust transfer line to the ladle; A driving cylinder installed on the deck and connected to a lever extending outwardly of the rotation shaft of the transfer tube to rotate the rotation shaft, wherein the rotation means for selectively positioning the outlet of the transfer tube on the upper ladle is provided. Heavy dust processing apparatus of refinery furnace to include. The hopper for storing heavy dust is installed at the lower end of the transfer line, and an induction chute is installed at the inlet of the transfer pipe to guide heavy dust falling through the outlet of the hopper to the transfer pipe. Heavy dust treatment equipment for refining furnaces. 4. The spiral of claim 2 or 3, wherein a spiral pipe is formed to be slidably inserted into the outlet of the transfer pipe and vertically lifted up and down, and a spiral for forming a rotary flow in the heavy dust dropped along the inner peripheral surface of the flying pipe is dropped. Guided by blades, which are installed on the exit and entrance sides of the transfer pipe, one end is fixed to the outside of the scattering pipe, and the other end is fixed to the bracket installed on the deck to move up and down the scattering pipe according to the rotation of the transfer pipe. Including a chain to make, the heavy dust processing apparatus of the refining furnace further comprising scattering means for evenly spraying heavy dust in the ladle.

Images