KR101178538B1 - Dust removing device for melting furnace - Google Patents

Abstract

PURPOSE: A dust removal device of a melding furnace is provided to improve the reduction efficiency of fine ore through smooth supply of reductant gas, from which carbon and iron based dust are removed. CONSTITUTION: A dust removal device of a melding furnace comprises a dust collecting unit(41) and a foreign material support(42). The dust collecting unit is installed between a vertical exhaust pipe(31) and a horizontal exhaust pipe(32) which connect a melting furnace(10) and a hot cyclone(20). The dust collecting unit has a spherical shape whose diameter is greater than those of the vertical and horizontal exhaust pipes in order to temporarily reduce the flux of reductant gas. The dust collecting unit is connected to the vertical and horizontal exhaust pipes. The foreign material support is located inside the dust collecting unit and supports dust dropping along the inner wall of the dust collecting unit.

Description

Dust removal device of melting furnace {DUST REMOVING DEVICE FOR MELTING FURNACE}

The present invention relates to a dust removing apparatus of a melting furnace, and more particularly, to a dust removing apparatus for effectively collecting and removing iron (Fe) -based dust in the reducing gas generated in a FINEX melting furnace.

The recently developed FINEX process separates only the particle size from the first mined state of powdered iron ore (spectral ore) and fine coal (pulverized coal) as raw materials and fuel for steel making, and uses it through a flow reduction furnace. This Finex process has the advantages of low fuel cost and less environmental pollution than the conventional blast furnace method.

The Finex process includes a flow reduction process for reducing the spectroscopy in a flow reduction furnace and a melting process for melting the spectroscopy reduced in the flow reduction furnace in a melting furnace. In the furnace, a large amount of carbon monoxide is generated by the combustion of coal, and the carbon monoxide is introduced into the flow reduction furnace and used as a reducing gas.

The furnace is connected to a hot cyclone through a gas discharge line. The hot cyclone collects dust from the exhaust gas of the melting furnace and supplies it back to the melting furnace, and supplies the separated gas to the flow reduction furnace as a reducing gas. Flue gas emissions include carbon-based dusts (powder coke and char) and iron-based dusts.

Carbon-based dust can be easily recovered using the principle of colliding with the ceiling of the gas discharge pipe and falling back to the melting furnace. However, since iron-based dust does not have a specific removal method, a large amount of iron dust may be attached inside the gas discharge pipe and the hot cyclone, causing clogging. In this case, it is impossible to recycle the reducing gas due to the efficient collection of dust, which causes trouble in operation.

The present invention effectively removes the iron (Fe) -based dust of the exhaust gas generated in the melting furnace to prevent clogging of the gas discharge pipe and hot cyclone, smoothly reducing the reducing gas separated from the carbon-based dust and iron-based dust in the flow reduction furnace It is an object of the present invention to provide a dust removal apparatus for a melting furnace that can be supplied easily.

Dust removal apparatus according to an embodiment of the present invention for collecting and removing dust from the reducing gas discharged to the hot cyclone in the melting furnace, is installed between the vertical discharge pipe and the horizontal discharge pipe connecting the melting furnace and the hot cyclone, A dust collecting part having a larger diameter than the vertical discharge pipe and the horizontal discharge pipe to temporarily reduce the flow rate of the reducing gas, and a foreign material pedestal positioned within the dust collecting part and supporting the dust dropped along the inner wall of the dust collecting part; .

The dust collecting portion is formed in a spherical shape, and may be integrally connected with the vertical discharge pipe and the horizontal discharge pipe.

The foreign material pedestal is connected to the upper end of the vertical discharge pipe, it may be formed in a shape that narrows the inner diameter toward the center of the dust collector.

Cleaning manholes may be formed at the bottom of the dust collection around the foreign body pedestal. Foreign body pedestals can be made of bricks.

The dust removing apparatus of the melting furnace may further include an electromagnet provided outside the dust collecting unit and an outer wall surrounding the electromagnet. In this case, the foreign material pedestal may be made of a heat resistant steel sheet having a heat resistant temperature corresponding to the temperature of the reducing gas.

The dust removing apparatus according to the present embodiment can effectively trap not only the carbon-based dust but also the iron-based dust, thereby preventing the clogging of the gas discharge pipe and the hot cyclone due to the iron-based dust. As a result, it is possible to smoothly supply the reducing gas from which the carbon-based dust and the iron-based dust are separated to the flow reduction furnace, thereby improving the reduction efficiency of the spectroscopy.

1 is a schematic view showing a dust removal apparatus and a melting furnace and a hot cyclone connected thereto according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of a dust removing apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

1 is a schematic view showing a dust removing device according to an embodiment of the present invention, a melting furnace and a hot cyclone connected thereto, and FIG. 2 is an enlarged cross-sectional view of the dust removing device according to an embodiment of the present invention.

1 and 2, the melting furnace 10 for the Finex process is connected to a flow reduction furnace (not shown) to receive the reduced ferrite ore, and melt it. Melting furnace 10 also receives the pulverized coal as a fuel and burns it, and supplies a large amount of carbon monoxide generated by the pulverized coal combustion to the flow reduction furnace via a hot cyclone 20 as a reducing gas.

A gas discharge pipe 30 is installed between the melting furnace 10 and the inlet of the hot cyclone 20 to supply the reducing gas generated in the melting furnace 10 to the hot cyclone 20. The dust recovery pipe 35 is installed between the outlet of the hot cyclone 20 and the melting furnace 10 to supply the dust collected by the hot cyclone 20 to the melting furnace 10. In FIG. 1, reference numeral 36 denotes a reducing gas supply pipe connecting an outlet of the hot cyclone 20 and a flow reduction furnace.

The gas discharge pipe 30 includes a vertical discharge pipe 31 connected to the melting furnace 10 and a horizontal discharge pipe 32 connected to the hot cyclone 20. The vertical discharge pipe 31 and the horizontal discharge pipe 32 may be formed in the same size.

Dust removal device 40 according to the present embodiment is a spherical dust collecting portion 41 is installed between the vertical discharge pipe 31 and the horizontal discharge pipe 32, and the dust discharge portion 41 is located inside the vertical discharge pipe ( 31 is connected to the foreign material pedestal 42.

The dust collecting part 41 is integrally formed with the vertical discharge pipe 31 and the horizontal discharge pipe 32 to constitute a part of the gas discharge pipe 30. That is, the dust collecting portion 41 is made of a metal plate such as the vertical discharge pipe 31 and the horizontal discharge pipe 32, the reducing gas generated in the melting furnace 10 is the vertical discharge pipe 31 and the dust collecting portion 41 and Through the horizontal discharge pipe (32) in order to be supplied to the hot cyclone (20).

At this time, the diameter of the dust collecting portion 41 is formed larger than the width (or diameter) of the vertical discharge pipe 31 and the horizontal discharge pipe (32). For example, the diameter of the dust collecting portion 41 may be set to twice or more than the width (or diameter) of the vertical discharge pipe 31 and the horizontal discharge pipe 32.

As the dust collecting part 41 occupies a large volume between the vertical discharge pipe 31 and the horizontal discharge pipe 32 as described above, the flow rate of the reducing gas introduced from the melting furnace 10 into the gas discharge pipe 30 is reduced to dust water. At denial 41 it drops momentarily rapidly. Therefore, when the reducing gas discharged from the melting furnace 10 passes through the dust collecting part 41, the dust included in the reducing gas falls along the inner wall of the dust collecting part 41.

The dust dropped from the dust collection part 41 includes both carbon-based dust and iron-based dust. In particular, since the iron-based dust is effectively collected in the dust collecting portion 41 is not introduced into the hot cyclone 20 through the horizontal discharge pipe (32). As a result, clogging caused by accumulation of iron-based dust in the horizontal discharge pipe 32 and the hot cyclone 20 can be effectively prevented.

The foreign material pedestal 42 is connected to the upper end of the vertical discharge pipe 31, and is formed in a shape in which the inner diameter becomes narrower toward the center of the dust collecting portion 41. That is, the foreign material pedestal 42 may be formed in a reverse funnel shape. The foreign material pedestal 42 supplies the reducing gas introduced from the vertical discharge pipe 31 to the dust collecting part 41 so that the foreign matter dropped along the inner wall of the dust collecting part 41 does not directly fall to the vertical discharge pipe 31. It serves to support them.

Therefore, the foreign matter dropped from the dust collecting part 41 accumulates around the foreign matter pedestal 42. And the cleaning manhole 43 is formed in the bottom part of the dust collection part 41 around the foreign material base 42. Therefore, when a certain amount of dust accumulated, the operator opens the cleaning manhole 43 to remove the dust accumulated in the dust collecting portion (41).

At this time, since the reducing gas discharged from the melting furnace 10 reaches a high temperature of 700 ° C to 800 ° C, the foreign material pedestal 42 may be formed of a brick without fear of thermal deformation. If the foreign body pedestal 42 is composed of a general iron plate instead of a brick, an accident may occur in which the vertical discharge pipe 31 is blocked due to heat deformation.

In addition, the dust removing apparatus 40 of the present embodiment may further include an electromagnet 44 provided outside the dust collecting unit 41 and an outer wall 45 surrounding the electromagnet 44. The electromagnet 44 is a form of winding a copper wire around an iron core and functions as a magnet whenever current flows through the copper wire to attach iron-based dust included in the reducing gas to the inner wall of the dust collecting part 41.

During the pause, the current supplied to the copper wire is cut off to drop the iron-based dust attached to the inner wall of the dust collecting part 41 downward. The dropped iron-based dust is discharged to the outside of the dust removing device 40 through the cleaning manhole 43 together with the carbon-based dust.

When the dust removal apparatus 40 includes the electromagnet 44, the foreign material pedestal 42 may be made of a heat resistant steel sheet having a heat resistance temperature corresponding to the temperature of the reducing gas instead of brick. In this case, while suppressing deformation of the foreign material pedestal 42, the magnetic force generated in the electromagnet 44 acts evenly inside the dust collecting part 41, thereby increasing the collection efficiency of the iron-based dust.

As such, the dust removing device 40 according to the present exemplary embodiment may effectively trap not only carbon-based dust but also iron-based dust, thereby preventing the gas discharge pipe 30 and the hot cyclone 20 from being clogged by the iron-based dust. . As a result, it is possible to smoothly supply the reducing gas from which the carbon-based dust and the iron-based dust are separated to the flow reduction furnace, thereby improving the reduction efficiency of the spectroscopy.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: melting furnace 20: hot cyclone
30: gas discharge pipe 31: vertical discharge pipe
32: horizontal discharge pipe 40: dust removing device
41: dust collection unit 42: foreign body support
43: cleaning manhole 44: electromagnet
45: outer wall

Claims (7)

In the dust removal apparatus for collecting and removing dust from the reducing gas discharged from the melting furnace to the hot cyclone,
The dust removal device,
A dust collecting unit installed between the vertical discharge pipe and the horizontal discharge pipe connecting the melting furnace and the hot cyclone, and having a diameter larger than that of the vertical discharge pipe and the horizontal discharge pipe to temporarily reduce the flow rate of the reducing gas; And
Located in the dust collection unit and foreign matter support for supporting the dust dropped along the inner wall of the dust collection unit
Dust removal apparatus of the melting furnace comprising a. The method of claim 1,
The dust collecting unit is formed in a spherical shape, the dust removing apparatus of the melting furnace is integrally connected with the vertical discharge pipe and the horizontal discharge pipe. The method of claim 1,
The foreign material pedestal is connected to the upper end of the vertical discharge pipe, the dust removal apparatus of the melting furnace is formed in a shape that the inner diameter narrows toward the center of the dust collection unit. The method of claim 3,
The dust removal apparatus of the melting furnace in which the cleaning manhole is formed in the bottom part of the said dust collection part around the said foreign material base. The method of claim 3,
The foreign body pedestal is a dust removal device of the melting furnace made of brick. 5. The method according to any one of claims 1 to 4,
An electromagnet installed outside the dust collection unit; And
An outer wall surrounding the electromagnet
Dust removal device of the melting furnace further comprising. The method of claim 6,
The foreign material pedestal is a dust removal apparatus of the melting furnace made of a heat-resistant steel sheet having a heat resistance temperature corresponding to the temperature of the reducing gas.

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