KR20150051519A - Apparatus and method for collecting dust of furnace gas - Google Patents

Abstract

The present invention relates to a method for eliminating dust of reducing gas in a steel manufacturing facility, which can properly remove dust contained in reducing gas supplied to a flow reducing furnace, and more specifically, to a method for eliminating dust of reducing gas in a steel manufacturing facility, comprising the step of removing dust of reducing gas generated in a melting gas furnace and supplied to a reducing furnace by using a steel manufacturing method of reducing fine ore through a plurality of reducing furnaces arranged in a multistage, melting reducing steel in the melting gas furnace, and manufacturing steel.

Description

TECHNICAL FIELD [0001] The present invention relates to a reducing gas damping device and a damping method for a molten iron manufacturing facility,

TECHNICAL FIELD The present invention relates to a technique for manufacturing molten iron. More particularly, the present invention relates to a reducing gas damping apparatus and a damping method for a molten iron manufacturing facility capable of removing dust by pretreating a reducing gas supplied from a melting furnace to a flow path.

In the melt reduction steelmaking method, a reduction furnace for reducing iron ore and a melter-gasifier for melting reduced iron ore are used. When molten iron ore is melted in a melter-gasifier, molten coal is charged into the melter-gasifier as a heat source for melting iron ore. Here, the reduced iron is melted in a melter-gasifier, converted to molten iron and slag, and then discharged to the outside. The briquetted coal charged into the melter-gasifier furnishes a coal-filled bed.

Oxygen is blown through the tuyere installed in the melter-gasifier, and then the coal-packed bed is combusted to generate combustion gas. The combustion gas is converted into a hot reducing gas while rising through the coal packed bed. The high-temperature reducing gas is discharged to the outside of the melter-gasifier and supplied to the fluidized-bed reactor as a reducing gas.

A plurality of the fluidized-bed reactors are continuously disposed, and the spectra at room temperature are continuously charged into the uppermost reducing furnace and reduced by the high-temperature reducing gas supplied from the melter-gasifier to the fluidized-bed reactor while sequentially passing the plurality of reducing furnaces . The reduced iron produced in this manner is continuously charged into the melter-gasifier through the single-light treatment process, melted by the heat of coal combustion, and discharged as molten iron and slag.

However, in the conventional case, there is a problem that the dispersion plate nozzle inside the fluidized-bed reactor is clogged by the reducing gas supplied to the fluidized-bed reactor during the operation.

That is, the reducing gas generated in the melter-gasifier contains dust. When the dust is excessively introduced into the fluidized-bed reactor together with the reducing gas, the accident that the nozzle of the dispersion plate is clogged by the dust is frequently And this causes a problem that the operation of the fluidized-bed reactor becomes unstable.

A reduced gas damping device and a damping method of a molten iron manufacturing facility capable of appropriately removing dust contained in a reducing gas supplied to a fluidized-bed reduction reactor.

Also, there is provided a reduced gas damping device and a damping method of a molten iron manufacturing facility capable of removing dust of a reducing gas by utilizing a facility provided in the past.

To this end, the damping method of the present embodiment is a method for producing molten iron by reducing spectroscopy through a plurality of reduction furnaces disposed in multiple stages and melting the reduced iron in a melter-gasifier, And removing the dust from the reducing gas supplied to the exhaust pipe.

The dust removing step may include separating and collecting dust in the reducing gas, and the separation and collection of the dust may be performed in the process of passing the reducing gas through a dust eliminator installed between the melter-gasifier and the reducing furnace.

The dust removing step may be a structure in which the dust is removed in the process of reducing gas from the upper part to the lower part of the dust eliminator.

The dust removing step may further include discharging the dust separated from the reducing gas from the dust eliminator and collecting the collected dust, and storing the collected dust in the hopper.

The damping device of this embodiment is provided with a melter-gasifier furnished with reduced iron, a multi-stage reduction furnace connected to the melter-gasifier and providing reduced iron, and a reduction gas transfer pipe connected between the melter- And a dust eliminator for removing dust from the reducing gas supplied to the reducing furnace.

The dust eliminator includes a housing disposed on the transfer tube and through which a reducing gas passes, a vortex tube installed in the housing and connected to an outlet of the housing to separate dust from the reducing gas, And the lower end of the vortex tube is connected to the lower end of the housing to communicate with the outlet, and the upper end of the vortex tube is extended to the upper portion of the housing to supply the reducing gas May be directed downwardly through the top of the vortex tube.

The apparatus may further include a processing unit for processing dust in the housing.

The processing unit may include a cyclone connected to a lower portion of the housing to collect dust accumulated on the lower inner side of the housing, and a hopper connected to a lower end of the cyclone to receive dust collected in the cyclone.

As described above, according to the present embodiment, it is possible to minimize clogging of the dispersion plate nozzle of the fluidized-bed reactors by removing the dust from the reducing gas and then supplying it to the fluidized-bed reactors.

Thus, the operation of the fluidized-bed reactors can be performed smoothly and stably, thereby improving the operating efficiency.

In addition, dust can be removed by utilizing the backup burner provided on the facility as it is, thereby reducing the cost of constructing the facility for dust removal and increasing the competitiveness through cost reduction.

1 is a schematic view showing a molten iron manufacturing facility equipped with a reducing gas damping device according to the present embodiment.
FIG. 2 is a schematic view showing a reducing gas damping apparatus according to the present embodiment. FIG.
Fig. 3 is a diagram showing a part of the configuration of the reducing gas damping apparatus according to the embodiment in more detail.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Fig. 1 shows a molten iron manufacturing facility for treating residual spectroscopy according to this embodiment.

1, the molten iron manufacturing facility 100 of the present embodiment includes a melter-gasifier 120, a plurality of fluidized-bed reduction reactors (hereinafter referred to as a reduction furnace 110), a reduced iron compactor 130, And a compressed reduced iron storage tank (140). Here, the compressed reduced iron storage tank can be omitted. The apparatus for manufacturing molten iron may further include a dryer 160 for drying the ore supplied to the reducing furnace 110. In addition, the molten iron manufacturing facility 100 may include other devices as needed.

The spectroscopic and pulverized raw materials dried through the dryer 160 are continuously charged into the uppermost reducing furnace, and are sequentially passed through the multiple-stage reducing furnaces 110, and the high-temperature reducing gas generated in the melting and gasifying furnace 120 Is reduced. The reduced iron passing through the reduction furnace 110 is compressed through the compression molding machine 132 of the reduced iron compactor 130, and then charged into the melter-gasifier 120. The reducing gas generated in the melter-gasifier 120 is supplied to the reducing furnace. The spectroscopy is made of a reduced-flux iron while flowing by the reducing gas supplied from the melter-gasifier 120 to the fluidized-bed reduction reactor 110. The reduced iron is compressed by the compression molding machine of the reduced iron compactor and then stored in the compacted iron storage tank 140. The compressed reduced iron is supplied from the compressed reduced iron storage tank to the melter-gasifier (120) and melted in the melter-gasifier (120).

In this embodiment, three of the reducing furnaces 110 are connected in series and arranged in three stages. The spectroscopic data are sequentially passed through the respective reduction passages 110 from the upper end and then discharged from the reduction passages 110 disposed at the lower end and transferred to the reduced iron compression device 130. The number of the reducing furnaces 110 may be variously changed from three to four.

The molten iron manufacturing facility 100 of the present embodiment is installed on a reducing gas transfer pipe 22 connecting between the melter-gasifier 120 and the reducing furnace 110 to supply a reducing gas And a dust eliminator (10) for removing dust from the exhaust gas.

As shown in FIG. 2, the dust eliminator 10 of the present embodiment includes a housing 24 connected between the transfer tubes 22 and having a space therein with a reducing gas passing therethrough to collect dust separated from the reducing gas, And a vortex tube 12 installed in the housing 24 for removing reducing gas and dust.

The housing (24) has an inlet (26) through which the reducing gas flows into the upper side, and an outlet (28) through which the reducing gas is discharged from the lower center. A transfer pipe 22 is connected to an inlet 26 and an outlet 28 of the housing 24, respectively. The reducing gas transferred through the transfer pipe 22 installed in the melter-gasifier 120 flows into the inlet 26 of the housing 24 and is discharged to the outlet 28 of the housing 24, To the reducing furnace 110 through the transfer pipe 22 connected thereto.

The vortex tube 12 is a cylindrical tube structure with open upper and lower ends and is vertically disposed in the housing 24. The lower end of the vortex tube 12 is installed at the lower end of the housing 24 and communicates with the outlet 28. And the upper end of the vortex tube 12 extends upward in the housing and is spaced apart from the inner upper end of the housing 24 by a predetermined distance.

The lower end of the vortex tube 12 can be fixed to the housing 24 and maintained in a vertically installed state. A separate support member 14 is provided between the housing 24 and the upper end of the vortex tube 12 to support the upper end of the vortex tube 12 in an open state.

The reducing gas introduced into the housing 24 of the dust remover 10 through the inlet 26 is separated from the gas and dust by the vortex tube 12 and the dust is buried under the housing 24, (24) and the vortex tube (12). The reducing gas from which the dust has been removed is moved downward through the inlet 26 of the vortex tube 12 and exits through the outlet 28 of the housing 24 connected to the lower end of the vortex tube 12. By removing the dust from the reducing gas transferred to the reducing furnace 110 through the transfer pipe 22, it is possible to supply the reducing gas in a more clean state in which the dust is removed to the reducing furnace 110.

Here, the dust eliminator 10 of the present embodiment has a structure in which the gas moves from the upper part to the lower part, unlike the cyclone structure used for dust removal in the related art. This is because the vortex tube 12 of this embodiment is structured to be coupled with the outlet at the lower end of the housing.

As described above, in the dust eliminator 10 of the present embodiment, the vortex tube 12 is installed at the lower end of the housing, thereby preventing the vortex tube from falling out of the housing and falling down.

That is, in the case of the conventional cyclone for dust removal, the tube is installed at the upper end of the housing to move the gas from the lower part to the upper part. In this case, when the tube falls off the housing, .

However, as mentioned above, the dust eliminator 10 of the present embodiment has a structure in which the vortex tube 12 is installed at the lower end of the housing 24 and the reducing gas flows downward, Can be prevented.

Further, when dust is to be removed from the reducing gas at a high temperature as in the present embodiment, there is a high risk that the connecting portion between the housing and the vortex tube will fall due to the high temperature.

Therefore, by changing the direction of gas flow and attaching the vortex tube to the lower end of the housing, unlike the conventional cyclone, even in the process of treating the dust with the high-temperature reducing gas, the vortex tube is prevented from falling off by the high temperature and falling down the housing .

The dust eliminator 10 of the present embodiment further includes a processing unit 30 for processing dust separated from the reducing gas in the housing 24. 3, the processing unit 30 includes a cyclone 32 connected to the housing 24 for collecting and collecting dust from the housing, and a cyclone 32 connected to the lower end of the cyclone 32, And a hopper 34 for receiving the collected dust.

The cyclone 32 is installed on the lower side of the housing 24 and connected between the housing 24 and the vortex tube 12. Accordingly, the dust separated from the reducing gas and falling down between the housing 24 and the vortex tube 12 flows into the cyclone 32 together with some reducing gas by the pressure difference inside the housing 24.

The cyclone 32 separates some of the reducing gas and the dust, and the separated dust is stored in the hopper 34 connected to the lower portion of the cyclone 32. The reducing gas separated in the cyclone 32 is sent to a dust collector, for example, and reprocessed. A valve is provided on the inlet / outlet side of the hopper 34 connected to the lower end of the cyclone 32 and the cyclone 32 to prevent the reducing gas from leaking into the atmosphere. Thus, the dust separated from the housing 24 can be reprocessed without the leakage of the reducing gas.

Hereinafter, the process of removing dust from the reducing gas through the apparatus during the process of manufacturing molten iron will be described.

The damping method of this embodiment is a method for producing molten iron by reducing spectroscopy through a plurality of reduction furnaces 110 disposed in multiple stages and melting reduced iron in a melter-gasifier 120 to produce molten iron. 120 to remove dust from the reducing gas supplied to the reducing furnace 110.

Thus, by removing the dust from the reducing gas before supplying the reducing gas to the reducing furnace 110, it is possible to supply the reducing gas in a more clean state. Therefore, it is possible to prevent problems such as clogging of the dispersion plate nozzle of the reduction furnace 110 by the dust contained in the reducing gas.

The removal of the dust is carried out in the dust eliminator (10) provided on the transfer pipe (22) through which the reducing gas is transferred.

The reducing gas transferred from the melter-gasifier 120 to the dust eliminator 10 along the transfer pipe 22 flows into the housing 24 through the inlet 26 of the housing 24. The dust contained in the reducing gas is separated by the vortex tube 12 provided inside the housing 24. The separated reducing gas enters the open upper end of the vortex tube 12 and moves down through the interior of the vortex tube 12. The reducing gas is then exhausted through the outlet 28 of the housing 24 connected to the lower end of the vortex tube 12 and supplied to the reducing furnace 110 along the transfer pipe 22 connected to the outlet 28.

As described above, in the present embodiment, the reduction gas is separated from the upper portion of the vortex tube while collecting dust.

The dust separated from the reducing gas sinks to the lower portion of the housing 24 due to its own weight between the inside of the housing 24 and the vortex tube 12 and is collected through the cyclone 32 connected to the lower portion of the housing 24. That is, the dust is introduced into the cyclone 32 connected to the housing 24, separated again in the cyclone 32, and then collected in the cyclone 32. The dust collected in the cyclone 32 is stored in the hopper 34 connected to the lower end of the cyclone 32, and then transferred to a necessary portion and processed.

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: Dust remover 12: Vortex tube
22: transfer pipe 24: housing
26: inlet 28: outlet
30: processing section 32: cyclone
34: Hopper

Claims (6)

A method for producing molten iron by reducing spectra through a plurality of reduction furnaces disposed in multiple stages and melting molten reduced iron in a melter gasifier to remove molten iron from the reducing gas generated in the melter- Wherein the reducing gas is removed from the molten iron. The method according to claim 1,
Wherein the dust removing step includes separating and collecting dust from the reducing gas, and the separation and collection of the dust is performed in a process of moving the dust eliminator, which is installed between the melter-gasifier and the reducing furnace, Reduced gas damping method of molten iron manufacturing facility. 3. The method of claim 2,
Wherein the dust removing step further includes discharging the dust separated from the reducing gas from the dust remover and collecting the collected dust in the hopper. A melter-gasifier furnished with reduced iron,
A multi-stage reduction furnace connected to the melter-gasifier and providing reduced iron,
A dust eliminator provided on a reducing gas transfer pipe connecting between the melter-gasifier and the reduction furnace and removing dust from the reducing gas supplied to the reduction furnace;
Wherein the reducing gas is supplied to the reducing gas purifying apparatus. 5. The method of claim 4,
The dust eliminator includes a housing installed on the transfer tube and through which a reducing gas passes, a vortex tube installed in the housing and connected to an outlet of the housing to separate dust from the reducing gas,
The housing has an inlet through which the reducing gas flows into the upper side and an outlet through which the reducing gas is discharged at the lower end. The lower end of the vortex tube is connected to the lower end of the housing to communicate with the outlet, And the reducing gas flows downward through the upper end of the vortex tube. 6. The method of claim 5,
Further comprising a processing section for processing dust in the housing,
The processing unit includes a cyclone connected to a housing of a backup burner to collect dust, and a hopper connected to a lower end of the cyclone to receive dust collected in the cyclone.

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