KR101693517B1 - Device and method for treating dust of compacting machine - Google Patents

Abstract

Provided is a dust treating device for a compacting facility capable of reusing dust such as iron scraps or metal debris and the like collected during a compacted body manufacturing process; improves stability of a compacted body by retreating dust; and manufacturing the compact body with high quality. The dust treating device for the compacting facility comprises a first dust collecting unit connected to a storing tank wherein fine reduced iron is stored and collecting iron scraps contained in a gas discharged from the storing tank; and a second dust collecting unit connected to a compacting machine manufacturing a bracket, receiving and pressurizing the fine reduced iron of the storing tank, and collecting iron scraps contained in a gas discharged during the compacted body manufacturing process. The first dust collecting unit is connected to the second dust collecting unit transferring the iron scraps collected by the first dust collecting unit to the second dust collecting unit. The second dust collecting unit is connected to the storing tank and supplies the regenerated iron scraps to the storing tank. As such, the regenerated iron scraps with a relatively high oxidation limit are mixed with the fine reduced iron inside the storing tank.

Description

TECHNICAL FIELD [0001] The present invention relates to a device and a method for treating dust in a compacting plant,

The present invention relates to a compacting plant for producing compacted iron (HCI) by pressurizing a reduced material containing direct reduced iron (DRI) for producing molten iron, and more particularly, to a compacting plant for producing compacted iron (HCI) And more particularly, to a dust treatment apparatus and a treatment method of a compacting plant for treating dust in a compacting facility.

Recently, in order to solve the problems of the blast furnace method, steel mills in the world have directly used general coal as a fuel and a reducing agent, and as a steel source, they use a spectrophotometer that occupies more than 80% We are making a lot of efforts to develop the melt reduction method.

A melt-reduction steelmaking plant for producing molten iron using direct spectroscopy includes a fluidized-bed reactor and a compacting plant and a melter-gasifier connected thereto. The spectroscopic and additive materials at room temperature are reduced through the three-stage fluidized-bed reactors in turn. Minute reduced iron is compacted by compacting equipment through a compacting plant and charged into a melter-gasifier.

The compacting plant includes a storage tank storing minute reduced iron, a compacting machine for manufacturing briquettes by crushing the reduced iron, and a crusher for crushing briquettes to produce compacted compacts. The minute reduced iron is squeezed from the storage tank to the briquetting machine through the compacting machine and crushed while passing through the crusher to be made into the compact body. In this process, some parts are not crumbled or compacted and remain in the form of crumbs or minerals.

The compacted irons (HCI) are charged into the melting furnace and used as raw materials for the production of molten iron. In this case, when some reduced-form reduced iron is charged into the melting furnace, the furnace air permeability is lowered and the melting furnace operation is adversely affected. Therefore, the dust generated in the manufacturing process of the compacted material is collected through the dust collector.

Provided is a dust treatment apparatus and a treatment method of a compacting apparatus capable of recycling dust, such as dust and debris, collected in a compacting body manufacturing process.

Also provided is an apparatus and a treatment method of a compacting plant capable of manufacturing a compacted compact of high quality with improved stability of compacted material manufacturing through dust reprocessing.

To this end, the processing apparatus of the present embodiment includes a first dust collecting part connected to a storage tank storing minute reducing iron and collecting the fractions contained in the gas discharged from the storage tank, and a briquetting device formed by press- And a second dust collecting part connected to the compacting machine for collecting the fractions contained in the gas discharged in the compacting step,

The first dust collecting part is connected to the second dust collecting part and transfers the dust collected in the first dust collecting part to the second dust collecting part and mixes with the collected dust in the second dust collecting part and the second dust collecting part is connected to the first storage part, And the regenerated fractions collected in the dust collecting unit and the second dust collecting unit are mixed and supplied to the storage tank.

The processing apparatus of this embodiment may be a structure for supplying the regeneration fractions collected in the first dust collecting section and the second dust collecting section to the storage tank and mixing the regenerated fragrance having a relatively high oxidation degree with the powder reduced iron in the storage tank.

The first dust collecting unit includes a cyclone that receives gas discharged from a storage tank and collects fragrance in the gas, a dry dust collector connected to the cyclone and having a filter cloth therein for collecting fragrance from gas discharged from the cyclone, And a transfer line for connecting the second dust collecting unit and the collected dust to the second dust collecting unit.

The second dust collecting part is connected to the compacting machine and includes a multi cyclone for collecting fragrance from the gas discharged during the compacting process, a hopper for collecting collected fragments connected to the lower part of the multi cyclone, And a return line for transferring the recovered fractions collected in the hopper to the reservoir, wherein the hopper is connected to the first collecting part through the transfer line and the collected dust is transferred to the hopper by the first collecting part.

The second dust collector includes a dust collector connected to the multi-cyclone and having a filter cloth therein to collect dust from gas discharged from the multi-cyclone, and a dust bin connected to the bottom of the filter dust collector to collect dust collected therein can do.

The processing apparatus may further include a processing unit for discharging the collected sediment from the first dust collecting unit to the outside.

The processing unit may include an emergency discharge line connected between the transfer line and the dust bin to send the fractions transferred from the first dust collector to the dust bin, and a control valve for selectively connecting the transfer line and the emergency discharge line .

The processing method of this embodiment is a method of dusting a compacting plant for collecting and treating dust generated in a compacting plant, comprising the steps of: collecting the fractions from the gas discharged from the storage tank storing the minute- A first dust collecting step, a second dust collecting step of collecting the fractions through the second dust collecting part in the discharged gas during the compression molding of the reduced iron of the storage tank, the collected dust in the first dust collecting step to the second dust collecting part in the second dust collecting step And a recycling step of supplying the recovered fractions collected by the second dust collecting part to the storage tank.

In the transferring step, the process may further include a processing step of discharging the collected fractions from the first dust collecting part to the outside.

The processing step may be a structure for switching the direction of movement of the fragrance in the transferring step to interrupt the transfer of the fragrance to the second dust collecting part and emergency discharging the fragrance when the operation is unstable.

As described above, according to the present embodiment, dust productivity can be improved by recycling the dust.

Also, by appropriately maintaining the reducing power of the reduced iron by using the dust re-introduced into the storage tank, explosion due to rapid oxidation can be prevented and stability can be improved.

Further, by re-introducing dust having an appropriate particle size and a reduction ratio into a storage tank, it becomes possible to increase the efficiency of manufacturing the compacted material.

In addition, the emergency operation will enable facilities to operate more reliably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a dust collecting apparatus of a compacting plant according to an embodiment of the present invention; FIG.

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.

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. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 schematically shows an apparatus for dust treatment of a compacting plant according to the present embodiment.

As shown in FIG. 1, the processing apparatus 10 of the present embodiment collects and reprocesses dust generated during the process of compacting the reduced-powder reduced iron through a plurality of fluidized-bed reactors for producing molten iron. In the following description, dust can be understood as metal iron or iron oxide in the form of powder or debris contained in gas. The term "regenerated iron" means metal iron or iron oxide recovered from the gas and reprocessed.

The compacting plant for compacting the minute reduced iron includes a storage tank 100 in which the reduced iron is transported and stored by a pressure difference, and a compacting machine 110 that compresses and forms the reduced iron into briquettes. Although not shown in the drawings, in addition to the above-described configuration, the compacting equipment includes a crusher for crushing the produced briquettes into a compacted compact, a screen for sorting the compacted compacts by size, , A conveying conveyor, and the like.

In the process of producing the powder-reduced iron through the compacting equipment, a gas containing a large amount of high-temperature dust is generated. The dust contained in the hot gas discharged from the compacting plant is collected and reprocessed through the treatment apparatus.

1, the processing apparatus 10 of the present embodiment is connected to a storage tank 100 in which a powder-reducing iron is stored, and is connected to a storage tank 100 for collecting fractions contained in a high temperature gas discharged from the storage tank 100 1 dust collecting unit 20, and a separator 20 connected to the compacting machine 110 for receiving the reduced iron of the storage tank 100 to produce briquettes by compression molding, and collecting the fractions contained in the gas discharged in the compacting body manufacturing process 2 dust collecting section 30.

The first dust collecting unit 20 is connected to the second dust collecting unit 30 and transfers the collected fractions from the first dust collecting unit 20 to the second dust collecting unit 30. The second dust collection unit 30 is connected to the storage tank 100 and supplies the recovered recovered fractions to the storage tank 100 to mix the recovered fractions having a relatively high degree of oxidation with the reduced fractionated iron in the storage tank 100 .

In this manner, dust is collected through the first dust collecting unit 20 and the second dust collecting unit 30, and the collected recovered fractions are supplied to the storage tank 100 again so that the recycling rate can be increased and the yield of the compacted material can be improved do.

The reducing power of the reduced iron in the storage tank 100 is appropriately maintained by supplying and mixing the regenerated iron having a relatively low reducing power because the degree of oxidation is high in the relatively reduced reducing iron stored in the storage tank 100, It is possible to prevent the explosion due to the rapid oxidation of the reduced iron.

1, the first dust collecting unit 20 includes a cyclone 22 for receiving a vent gas discharged from the storage tank 100 and collecting the fractions in the gas, A dry dust collector 24 connected to the first dust collector 30 and having a ceramic filter therein to collect fractions from the hot gas discharged from the cyclone 22; And a transfer line 26 for transferring the collected fractions to the second dust collector 30.

The cyclone 22 primarily separates the dust contained in the gas discharged from the storage tank 100 and returns it to the storage tank 100 again.

The gas discharged from the cyclone 22 is sent to the dry dust collector 24 and collected. The dry dust collector 24 is a dry dust collector type dust collector having a plurality of ceramic filters therein. As the gas discharged from the cyclone 22 passes through the ceramic filter inside the dry dust collector 24, the dust contained in the gas is filtered.

The dust collected by the dry dust collector 24 is mainly composed of fine iron and iron oxide. The regeneration fractions filtered in the gas thus flow down to the bottom of the dry dust collector 24 and are transferred to the second dust collector 30 through the transfer line 26.

The dust collected in the dry dust collector 24 of the first dust collector 20 has a high temperature of about 400 ° C. or higher, a reduction rate of about 60 to 70%, and an average particle size of about 2 to 10 μm. Conventionally, dust collected by a dry dust collector is directly charged into a compacting apparatus to produce compacted compacts. However, when the dust collected by the dry dust collector 24 is directly charged into the compacting apparatus, the fraction becomes relatively high, which leads to a disadvantage that the compacting machine 110 has a low productivity of compacting the compacted product.

Unlike the first dust collecting part, the dust collected in the second dust collecting part 30 has a temperature of about 150 ° C, a reduction rate of about 50 to 55%, and an average particle size of about 15 to 30 μm. Therefore, when the dust collected by the second dust collecting unit is directly charged into the compacting unit, the reduction rate and the temperature are relatively low, which is disadvantageous in manufacturing the compacted material in the compacting machine 110. In addition, when only the dust collected by the second dust collecting unit is recharged to the storage tank immediately, the reduction rate of the powder reduced in the storage tank is lowered, which also reduces the productivity of the compacted material.

The dust that is recharged into the reservoir 100 can be recovered by moving the regenerated fractions collected in the first dust collector 20 to the second dust collector 30 through the transfer line 26 so that the average reduction rate is 55 to 60 %, And the average particle size is increased to 10 to 20 mu m, which is more advantageous for the compacting machine 110 in the compacting machine 110.

The second dust collecting part 30 is connected to the compacting machine 110 and includes a multi cyclone 32 for collecting fragrance from gas discharged during the compacting process, And a return line 36 connecting the hopper 34 and the storage tank 100 to transfer the recovered fractions collected in the hopper 34 to the storage tank 100.

The second dust collecting unit 30 includes a filter 40 connected to the multi-cyclone 32 and having a filter cloth therein for collecting dust from the gas discharged from the multi-cyclone 32, And a dust bin 42 connected to a lower portion of the dust collector 40 to collect the collected dust.

The multi-cyclone 32 separates the dust contained in the gas discharged during the compacting process, and the separated dust is collected in the hopper 34 connected to the lower portion of the multi-cyclone 32. At least one of the hoppers 34 may be connected in series.

The hopper 34 is connected to the dry dust collector 24 of the first dust collector 20 through a transfer line 26. That is, in this embodiment, the transfer line 26 connects between the dry dust collector 24 of the first dust collector 20 and the hopper 34 of the second dust collector 30. Thus, the regenerated fragrance collected by the dry dust collector 24 of the first dust collecting unit 20 is transferred to the hopper 34 immediately.

The regenerated fractions collected in the first dust collector 20 are transferred to the storage tank 100 through the return line 36 together with regenerated fractions collected in the second dust collector 30 and reprocessed.

The regeneration fractions collected in the first dust collection section 20 are about 60 to 70% in the regeneration fractions collected in the first dust collection section 20 and the regeneration fractions collected in the second particulate collection section 30 are in the range of about 50 to 55% It is relatively small. Thus, by regenerating the regenerated fragrance of the first dust collector having a relatively high reducing rate to the hopper and mixing the regenerated fragrance with the regenerated fragrance of the second dust collector having a relatively low reducing rate, the reduction ratio of regenerated fragrance inside the hopper can be raised to 55% or more . Therefore, compared with the case where only the regenerated fractions collected by the second dust collecting unit are transferred to the storage tank, the reduction ratio of the regenerated fragrance transferred to the storage tank can be increased and supplied.

In addition, a regeneration slurry having a relatively lower reduction ratio than the regenerated slag collected by the first dust collecting unit is finally put into the storage tank. Therefore, the reduction ratio of the regenerated fragrance collected by the first dust collecting unit can be appropriately lowered and the degree of oxidation can be increased, and it is possible to put the regeneration fragrance into the storage tank.

The return line 36 connects the hopper 34 and the storage tank 100 so that the recovered fractions collected in the hopper 34 are finally transferred to the storage tank 100 through the return line 36 and recycled.

As described above, the regenerated fractions are transferred to the storage tank 100 and put into the reducing iron in the storage tank 100, whereby the reducing power of the whole reduced iron in the storage tank 100 can be stably maintained.

There is a risk of explosion if reduced iron is oxidized rapidly. The regenerated fragrance is oxidized in the process of being collected from the gas through the first dust collecting unit 20 and the first dust collecting unit 20 so that the degree of oxidation is relatively higher than that of the reduced carbon in the storage tank 100. [

Thus, the regenerated fractions having a relatively high oxidation degree are supplied into the storage tank 100, so that the reducing power of the reduced iron in the storage tank 100 can be stabilized. Therefore, the processing apparatus of this embodiment is made compact by mixing the regenerated fractions with the fractionally reduced iron in the storage tank 100, thereby preventing the explosion due to the rapid oxidation of the reduced-fraction iron and making the compacted material more stable.

The filter / dust collector 40 finally collects the dust from the gas discharged from the multi-cyclone 32. The filtration and dust collector 40 is a dry dust collector type dust collector having a plurality of bag filters therein. The filter and dust collector 40 is connected to a suction pump 43 for providing a suction pressure of gas.

The dust collected in the filter dust collector 40 is collected in the dust bin 42 under the filter dust collector 40. The dust collected in the dust bin 42 is transferred to an external processing site using, for example, a vehicle, and reprocessed.

The processing apparatus of the present embodiment further includes a processing section for discharging the collected fractions from the first dust collecting section 20 to the outside when the operation is unstable in the process of collecting and recovering the recovered fractions and recycling them into the storage tank 100 can do.

1, the processing unit is connected between the transfer line 26 and the dust bin 42 so as to discharge the dust transferred from the first dust collector 20 to the dust bin 42, A line 44, and a control valve 46 for selectively connecting the transfer line 26 and the emergency discharge line 44.

The control valve 46 is installed at a connection point between the transfer line 26 and the emergency discharge line 44 and is driven according to an external control signal to connect the transfer line 26 and the emergency discharge line 44. The regeneration branch of the second dust collecting unit 30 is transferred from the dry dust collector 24 of the first dust collector 20 when the transfer line 26 and the emergency discharge line 44 are connected with each other by driving the control valve 46. [ And is discharged to the dust bin 42 along the emergency discharge line 44 without being transferred to the hopper 34.

In this way, if necessary, the regenerated fractions collected in the first dust collecting section 20 are discharged to the dust bin 42 directly without being transferred to the hopper 34 of the second dust collecting section 30, whereby the process instability can be improved .

Therefore, when the compacting operation becomes unstable due to accumulation of the differential due to the long-term operation, the regeneration and recovery of the fractions collected by the first dust collecting unit 20 is sent to the storage tank 100 to be discharged immediately without being recycled, And the defective compacting due to the fine powder can be improved.

Hereinafter, the dust treatment process of the compacting plant according to the present embodiment will be described.

The reduced iron that has been reduced through the reduction furnace is transferred to the storage tank 100 and charged into the compacting machine 110 to be compacted into briquettes. In the process of producing minute reduced iron as a compacted material, a gas containing a large amount of high temperature dust is generated.

First, the gas discharged from the storage tank 100 is filtered through the first dust collecting unit 20 to collect regenerated fractions. In addition, the gas discharged in the process of producing the pulverized iron as the compacted material is filtered through the second dust collecting part 30 to collect the recovered fractions.

The regenerated fractions collected through the filtering process through the first dust collection unit 20 are transferred to the second dust collection unit 30 and collected together with the regenerated fractions collected through the filtering process by the second dust collection unit 30.

The regenerated fractions thus collected are transferred to the storage tank 100 and then introduced into the storage tank 100. Thus, the regenerated iron having a relatively high degree of oxidation is introduced into the powder-reduced iron contained in the storage tank 100 and mixed. Since the reduced iron having relatively high oxidation degree and the regenerated iron having relatively low oxidation degree are mixed together, the degree of oxidation of the reduced iron can be appropriately controlled to prevent the explosion due to the sudden oxidation of the reduced iron.

In this case, when the compacting operation becomes unstable due to the accumulation of the differentiations due to the long-term operation in the process, the regenerated fractions transferred to the storage tank 100 are mixed and mixed with the reduced- The regenerated fractions of the collected derivatives are immediately discharged without being sent to the storage tank 100. Therefore, it is possible to improve the operational failure due to excessive differentials.

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: processing device 20: first dust collector
22: Cyclone 24: Dry dust collector
26: transfer line 30: second dust collecting part
32: multicycle 34: hopper
36: return line 40: filtration dust collector
42: dust bin 44: emergency discharge line
46: Control valve

Claims (9)

A first dust collecting part connected to a storage tank storing minute reduced iron and collecting the fractions contained in the gas discharged from the storage tank, and a second dust collecting part connected to a compacting machine for producing briquettes by receiving the reduced iron of the storage tank, And a second dust collecting part for collecting the fractions contained in the gas discharged in the process,
The first dust collecting part is connected to the second dust collecting part to selectively transfer the collected fractions collected in the first dust collecting part to the second dust collecting part and mix the collected fractions with the collected dust in the second dust collecting part, And the regenerant fractions collected in the first and second dust collectors are supplied to the storage tank. The method according to claim 1,
The first dust collecting unit includes a cyclone that receives gas discharged from a storage tank and collects fragrance in the gas, a dry dust collector connected to the cyclone and having a filter cloth therein for collecting fragrance from gas discharged from the cyclone, And a transfer line for connecting the second dust collecting part and the collected dust to the second dust collecting part. 3. The method of claim 2,
The second dust collecting part is connected to the compacting machine and includes a multi cyclone for collecting fragrance from the gas discharged during the compacting process, a hopper for collecting collected fragments connected to the lower part of the multi cyclone, And a return line for transferring the regenerated fractions collected in the hopper to the reservoir, wherein the hopper is connected to the first dust collector through the transfer line, and the fractions collected in the first dust collector are transferred to the hopper, . The method of claim 3,
The second dust collector includes a dust collector connected to the multi-cyclone and having a filter cloth therein to collect dust from the gas discharged from the multi-cyclone, and a dust bin connected to the bottom of the filter dust collector to collect dust collected therein The apparatus for treating dust in a compacting plant. 5. The method of claim 4,
Wherein the processing apparatus further comprises a processing section for discharging the collected fractions from the first dust collecting section to the outside. 6. The method of claim 5,
The processing unit may include an emergency discharge line connected between the transfer line and the dust bin to send the fractions transferred from the first dust collector to the dust bin, and a control valve for selectively connecting the transfer line and the emergency discharge line Dust treatment equipment for compacting equipment. A dust treatment method for a compacting plant for collecting and treating dust generated in a compacting plant,
A first dust collecting step of collecting the fractions through the first dust collecting part in the gas discharged from the storage tank storing the minute reduced iron,
A second dust collecting step of collecting the fractions through the second dust collecting part in the discharged gas during the compression molding of the reduced iron of the storage tank,
A transfer step of selectively transferring the collected fractions in the first dust collecting step to the second dust collecting part in the second dust collecting step,
A recycling step of supplying the regeneration fractions of the first and second dust collecting parts collected in the second dust collecting part to the storage tank,
Wherein the dust-treating equipment is a dust-treating plant. 8. The method of claim 7,
Further comprising a treating step of discharging the fractions collected in the first dust collecting part to the outside in the transferring step. 9. The method of claim 8,
Wherein the processing step is a step of switching the direction of movement of the fractions in the transfer step when the operation is unstable, thereby blocking the transfer of the fractions to the second dust collecting part and emptying the fragments.

Images