KR101664828B1 - Apparatus and method for manufacturing directed reduced irons and apparatus and method for manufacturing molten irons using the same - Google Patents

Abstract

Provided is a reduced iron manufacturing apparatus and method for reusing reduced iron by dry cooling when high temperature spectroscopy and dust are being dumped during a reducing process in a reduction furnace, and a device and a method for manufacturing molten iron using the same. The apparatus for producing reduced iron according to one embodiment of the present invention comprises: i) at least one reducing furnace for producing reduced iron by reducing iron ore; ii) a dry storage tank connected to the reducing furnace for cooling and storing the iron ores discharged from the reducing furnace; Iii) a water collecting device connected to the dry storage tank for wet-dusting the dust discharged from the dry storage tank.

Spectroscopy, molten iron, manufacturing, dry, cooling

Description

TECHNICAL FIELD The present invention relates to a reduced iron manufacturing apparatus and method, and a device and a method for manufacturing molten iron using the reduced iron manufacturing apparatus and method. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a reduced iron manufacturing apparatus and method for dry-cooling spectroscopy and dust during dumping of high-temperature spectroscopy and dust in a molten iron manufacturing process using general charcoal and spectroscopy, and to an apparatus and method for manufacturing molten iron using the same.

Generally, the blast furnace method, which is a type of molten iron production facility, has a certain level of strength over the characteristics of the reactor. And a raw material having a particle size capable of ensuring ventilation in the furnace. The carbon source used as fuel and reductant depends on the coke treated with the specific cokes. As the iron source, it mainly relies on the sintered ores which have undergone a series of agglomeration processes.

As a result, the existing blast furnace process is accompanied by a raw material pre-treatment equipment such as coke making equipment and sintering equipment. However, the competitiveness of the current blast furnace law is rapidly eroding due to the huge investment cost required for constructing the above-mentioned auxiliary facilities, and enormous investment costs for the enormous environmental pollution prevention equipment to overcome the global regulations on the environmental pollutants generated in the auxiliary facilities. .

In order to cope with the above situation, countries around the world use general coal directly as a fuel and reducing agent, and develop new process to manufacture molten iron by directly using spectroscopy which occupies more than 80% have.

Provided is a reduced iron manufacturing apparatus and method for reusing reduced iron by dry cooling when high temperature spectroscopy and dust are being dumped during a reducing process in a reduction furnace, and a device and a method for manufacturing molten iron using the same.

The apparatus for producing reduced iron according to one embodiment of the present invention comprises: i) at least one reducing furnace for producing reduced iron by reducing iron ore; ii) a dry storage tank connected to the reducing furnace for cooling and storing the iron ores discharged from the reducing furnace; Iii) a water collecting device connected to the dry storage tank for wet-dusting the dust discharged from the dry storage tank.

The dry storage tank includes an inner cyclone installed therein. The inner cyclone can separate dust from iron ore. In the dry storage tank, an outlet for discharging iron ores separated from dust can be formed. The temperature of the iron ores discharged through the outlet may be set to 130 degrees or less.

And an external cyclone located between the dry storage tank and the water collection tank, for filtering and returning the dust discharged from the dry storage tank to the dry storage tank. The control valve may further include a control valve disposed between the dry storage tank and the water collecting unit, for controlling the transfer pressure of the dust discharged from the external cyclone to the water collecting unit. The transfer pressure of the dust discharged to the dust collector can be adjusted in the range of 0.1 bar to 1.5 bar.

The dry storage tank may include a gas supply pipe for cooling the iron ores by supplying a cooling gas into the inside thereof. The water collector can wet-dust the exhaust gas discharged from the reduction furnace. The reducing furnace may be a fluidized-bed reduction furnace. In this case, the at least one reducing furnace may include a plurality of reducing furnaces. The reducing furnace may be a packed-bed reduction furnace.

The apparatus for manufacturing molten iron according to an embodiment of the present invention comprises: i) at least one reducing furnace for producing reduced iron by reducing iron ore; ii) a melter- gasifier connected to the reducing furnace, for melting molten reduced iron by supplying reduced iron, Iii) a dry storage tank connected to the reduction furnace for cooling and storing the iron ores discharged from the reduction furnace, and iv) a water and dust collector connected to the dry storage tank for wet-damping the dust discharged from the dry storage tank.

According to one embodiment of the present invention, there is provided a method for producing reduced iron, comprising the steps of: i) discharging iron ores from one or more reduction furnaces that are made of reduced iron by reducing iron ore, ii) cooling and storing the discharged iron ores in a dry storage tank connected to the reduction furnace And iii) wet-dusting the dust discharged from the dry storage tank in a water collector connected to the dry storage tank.

In the step of cooling and storing the iron ore in the dry storage tank, it is possible to cool the iron ore by supplying a cooling gas to the dry storage tank. The cooling gas may be composed of a non-reducing gas, and the non-reducing gas may be composed of nitrogen gas. The inflow amount of the cooling gas into the dry storage tank can be controlled according to the amount of iron ore flowing into the dry storage tank. And separating the dust from the iron ores in the dry storage tank.

The reduced iron manufacturing method according to an embodiment of the present invention may further include filtering dust before returning the dust discharged from the dry storage tank to the dust collector, and returning the dust to the dry storage tank.

The reduced iron manufacturing method according to an embodiment of the present invention may further include adjusting a transfer pressure of dust discharged to the dust collector.

The reduced iron manufacturing method according to an embodiment of the present invention may further include a step of wet-damping the exhaust gas discharged from the reduction reactor by the water collector.

Iron ore can be converted into reduced iron by flowing in the reducing furnace. The at least one reducing furnace includes a plurality of mutually connected reducing furnaces, and the iron ores can be reduced while sequentially passing through the plurality of reducing furnaces. Iron ore can be converted into reduced iron in a state of being filled in the reducing furnace. Iron ore may be discharged when the reduction furnace is started, stopped or abnormal.

The method of manufacturing molten iron according to an embodiment of the present invention comprises the steps of: i) discharging iron ores from one or more reduction furnaces which are made of reduced iron by reducing iron ore, ii) supplying the reduced iron to the melter- , Iii) cooling and storing the discharged iron ore in a dry storage tank connected to the reduction furnace, and iv) wet-dusting the dust discharged from the dry storage tank in a water collector connected to the dry storage tank .

The apparatus and method for manufacturing reduced iron and the apparatus and method for manufacturing molten iron using the same can dry and separate the spectra and gas reduced to high temperature without using the process water and can separate the separated spectra and gas.

In addition, when cooling the spectra to be cooled at a high temperature, it is possible to simplify and reduce the capacity compared to the existing water treatment facility by constructing a dry cooling facility using natural cooling and non-reducing gas (nitrogen or process gas).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described below. In the specification and drawings, the same reference numerals denote the same elements.

Fig. 1 shows a reduced iron manufacturing apparatus 100 according to a first embodiment of the present invention.

Referring to FIG. 1, a reduced iron manufacturing apparatus 100 includes a reducing furnace 10, a dry storage tank 20, a control valve 30, and a gas supply pipe 40.

The reduction furnace 10 produces reduced iron by reducing iron ore, and one or more iron ores can be installed. Here, iron ore is used as a term including spectroscopy, and unless otherwise specified, iron ore can be interpreted as spectroscopy. The reducing furnace 10 may be a fluidized-bed reduction furnace, and the at least one reducing furnace may include a plurality of reducing furnaces. As shown in Fig. 1, the reducing furnace 10 may be composed of three. The amount of the reducing furnace 10 may be composed of one or four reducing furnaces as required.

The dry storage tank 20 cools and stores the iron ores and dust discharged through the dumping pipe 12 in the multiple-stage reduction furnace 10 for reducing iron ores. An inner cyclone 22 is provided inside the dry type storage tank 20 and the inner cyclone 22 functions to separate dust and spectral flows into the inside thereof.

The dust separated in the dry storage tank 20 is connected to be supplied to the water collector 14 and the separated spectra from the dry storage tank 20 are supplied to the ore discharger 16. The water collector 14 is an exhaust gas cooling device of the reducing furnace 10 and can wet-exhaust the exhaust gas discharged from the reducing furnace 10. [ The ore extractor 16 includes a screw feeder or a rotary feeder mounted at the bottom of the dry storage 20. In the dry type storage tank 20, an outlet 25 for discharging the iron ores separated from the dust may be formed. Here, the temperature of the iron ores discharged through the discharge port 25 may be set to 130 degrees or less. If necessary, the temperature of the iron ore to be discharged may be set to a temperature exceeding 130 ° C. However, the temperature is set higher than 130 ° C., so that the risk of explosion is increased. Therefore, it is necessary to set the upper limit value for the discharge temperature of iron ore to a temperature at which the risk of explosion at the time of discharge can be solved. For reference, the lower limit value for the temperature of the discharged iron ore is not limited. There is no particular problem in iron ore discharge at temperatures below 130 degrees Celsius, so the lower temperature value of the iron ore being discharged is not meaningful.

The control valve 30 is provided on the line of the gas conduit connecting one side of the inner cyclone 22 and the water collecting device 14. The control valve 30 controls the transfer pressure of the dust which is opened or closed in accordance with the external force and discharged from the internal cyclone 22 to the dust collector 14. Here, the feed pressure of the dust discharged to the water collector 14 can be set in the range of 0.1 bar to 1.5 bar. The reason why the feed pressure of the dust discharged to the water precipitator 14 is adjusted in the range of 0.1 bar to 1.5 bar is to discharge and treat the dust with a constant capacity through the feed pressure control. If the feed pressure is greater than 1.5 bar, there is a risk of explosion of the pipe due to high pressure during dust transfer. On the other hand, the lower limit value of the feed pressure can be set to 0.1 bar, because the feed of dust can not be carried out below 0.1 bar. At low transfer pressures, such as 0.1 bar pressure, the phenomenon that dust adheres to the tube is intensified, causing a problem of poor ventilation of the tube. Therefore, the lower limit value of the transfer pressure can be set to a pressure enough to overcome the decrease in air permeability of such pipe.

The gas supply pipe 40 is connected to one side of the dry storage tank 20. The gas supply pipe (40) guides the flow of the cooling gas flowing into the dry storage tank (20). The cooling gas may be a non-reducing gas, and may be nitrogen gas or a process gas.

The inflow amount of the spectroscopic and gas flowing into the dry storage tank 20 can be adjusted according to the pressure difference AP between the front end and the rear end of the dry storage tank 20. [ The spectra and gas entering the dry storage tank 20 are separated by the inner cyclone 22. The separated gas is connected to the water collector 14 to be cooled and the separated spectra are gradually cooled in the dry storage tank 20 or cooled by the cooling gas flowing into the dry storage tank 20 through the gas supply pipe 40 And cooled.

2 shows a reduced iron manufacturing apparatus 200 according to a second embodiment of the present invention. The reduced iron manufacturing apparatus 200 of FIG. 2 is similar to the reduced iron manufacturing apparatus 100 of FIG. 1, so that the same reference numerals are used for the same parts, and a detailed description thereof will be omitted.

Referring to FIG. 2, the reduced iron manufacturing apparatus 200 further includes an outer cyclone 26 in the first embodiment.

The outer cyclone 26 is connected to the gas conduit and the capture light source inlet between one side of the dry storage tank 20 and the water collector 14, respectively. The outer cyclone 26 separates the dust and the spectra that enter the interior.

In this case, the control valve 30 is provided on the line of the gas conduit connecting the one side of the external cyclone 26 and the dust collector 14. The control valve 30 controls the transfer pressure of the dust which is opened or closed according to the external force and discharged from the external cyclone 26 to the dust collector 14.

And the spectrums and the gas flowing into the dry storage tank 20 are separated by the inner cyclone 22 and the outer cyclone 26. Therefore, the separation efficiency of the spectroscopic gas and the gas introduced into the dry type storage tank 20 can be further improved.

FIG. 3 is a view showing a reduced iron manufacturing apparatus 300 according to a third embodiment of the present invention. FIG. 3 shows a reduced iron 10 replaced with a packed bed type reducing furnace 18 in the reduced iron manufacturing apparatus 100 of FIG. 1, and other parts can be used equally. Therefore, detailed description of the same portions as those of the first embodiment of the present invention will be omitted.

In the packed-bed reduction reactor (18), iron ore can be converted into reduced iron in a state filled in the packed-bed reduction reactor (18). Iron ore can be discharged when the packed-bed reduction reactor 18 is started, stopped, or abnormal.

FIG. 4 is a view showing a molten iron manufacturing apparatus 400 including the reduced iron manufacturing apparatus 100 of FIG.

The molten iron manufacturing apparatus 400 includes the reduced iron manufacturing apparatus 100 of FIG. 1 and the melter-gasifier 42. The melter-gasifier 42 is supplied with reduced iron ore (reduced iron) and general coal (algae, molded coal) and melts to produce molten iron.

The molten iron manufacturing apparatus 400 includes a reducing furnace 10, a ferrous storage 20, a compacting apparatus, a melter-gasifier 42, and a reducing gas supply pipe 52. In addition, the molten iron manufacturing apparatus may further include a high-temperature microbial device 60 connected between the compactor manufacturing apparatus 50 and the melter-gasifier 42. In addition, the molten iron manufacturing apparatus 400 may further include various other devices necessary for manufacturing molten iron.

The reducing furnace 10 has a fluidized bed formed therein, and is sequentially connected to reduce the spectroscopies of the fluidized bed. Each reducing furnace 10 receives the reducing gas discharged from the coal packed bed of the melter-gasifier 42 through the reducing gas supply pipe 52.

The compacted material manufacturing apparatus 50 thickens the reducing body to ensure air permeability and prevent scattering. The compacting material manufacturing apparatus 50 includes a charging hopper 32, a pair of rolls 34, a crusher 36, and a compacting material reservoir 38. In addition, the compactor manufacturing apparatus may include other apparatuses as required.

The charging hopper 32 stores the fractions supplied from the fragrance storage device 20, and the pair of rolls 34 press the reducing body to produce a compacted reduced body. The crusher 36 crushes the compacted reduced body to an appropriate size, and the compacted body storage tank 38 temporarily stores the crushed reduced body.

The high-temperature microbial cell pressure-regulating device (60) is located between the compacting material manufacturing apparatus and the melter-gasifier (42). The high-temperature microbearing device 60 is installed above the melter-gasifier 42 for pressure control. Since the inside of the melter-gasifier 42 is at a high pressure, the hot-gas backpressure device 60 uniformly adjusts the pressure to easily load the crushed compacted material into the melter-gasifier 42.

In the melting and gasifying furnace (42), coal briquettes formed by molding algae or pulverized coal are supplied to form a coal packed bed. The coal or the coal injected into the melter-gasifier 42 is gasified by the pyrolysis reaction at the upper part of the coal packed bed and the combustion reaction with oxygen at the lower part.

The high-temperature reducing gas generated in the melter-gasifier 42 by the gasification reaction is supplied to the reducing furnace 10 in turn through the reducing gas supply pipe 52 connected to the downstream end of the final reducing furnace to be used as a reducing agent and a fluidizing gas.

On the other hand, in the molten steel manufacturing process, the spectral charges charged into the plurality of reducing furnaces 10 are brought into contact with the reducing gas through the reducing furnace 10, and a reduction reaction occurs. In this process, the final reduced spectra are transferred to a massifier and supplied to the process of manufacturing molten iron through a molding process.

In this molten iron manufacturing process, the high-temperature reduced spectroscopy charged to the reducing furnace 10 is discharged to the outside when the operation of the reducing furnace 10 is stopped or during the operation / equipment failure during operation.

Here, the case of using the wet cooling method without using the dry cooling method will be described. A wet cooling method in which process water is used for separation and cooling of the spectroscopic and high-temperature reducing gas upon discharge of the reducing spectroscopy can be used. These wet cooling methods are combined with process gas piping using valves that control the pressure of steam and reducing gas generated in contact with the process water during cooling and are supplied to the power plant or burned. The process water used for cooling and the reducing spectra are mixed and separated into process water and sludge in the water treatment facility. The process water and the sludge separation process need to be operated only during the dumping (dumping) operation of the reducing furnace. In the case of such a wet cooling method, the operation rate is very small, less than 3%, but the equipment construction and processing are complicated when the cooling process is carried out with the process water, thereby increasing the capacity of the entire water treatment facility.

An embodiment of the present invention discloses an apparatus and a method for recycling a reduced iron using a dry-type storage tank (20) when dumping high-temperature spectroscopy during a reduction process in a reducing furnace (10) in a molten iron manufacturing process using micro-spectroscopy.

In case of high-temperature reduction spectroscopy dumping, the water treatment facility using existing process water is replaced with dry cooling treatment. Therefore, the reduction spectroscopy can be recycled and no separate water treatment facility is required. In addition, all of the exhausted reducing gas can be recycled during dumping.

The iron ores are reduced in the reducing furnace (10) to produce reduced iron in the manufacturing process of the molten iron using the non-spectroscopy, and the iron ores are discharged from the at least one reducing furnace (10). For example, it is assumed that iron ore is discharged when dumping operation of the reduction furnace 10 is performed when the operation is interrupted and the equipment is abnormal.

At the dumping of the reducing furnace 10, the reducing gas 10 and the reducing gas at a high temperature are mixed with each other and introduced into the dry storage tank 20. At this time, the iron ores discharged from the reducing furnace 10 are cooled and stored in the dry storage tank 20 connected to the reducing furnace 10. Thereafter, the reducing gas and the split light are separated in stages while passing through the inner cyclone 22 and the outer cyclone 26, respectively. The high-temperature reducing gas, which has been separated stepwise while passing through the inner cyclone 22 and the outer cyclone 26, is supplied to the water collector 14. The water precipitator 14 wet-destroys the exhaust gas discharged from the reducing furnace 10 and the reducing gas supplied from the dry-type storage tank 20. Through this process, the direct reduced iron of high temperature is reduced to spectroscopy by using the dry storage tank 20, and the reducing gas is subjected to wet damping by the water collector 14 connected to the dry storage tank 20.

On the other hand, the high-temperature spectroscopy is discharged by the pressure difference between the reducing furnace (10) and the dry storage tank (20). A control valve (30) is installed to discharge and treat the high-temperature spectroscopy at a constant transfer pressure. As the control valve 30 is installed, the high-temperature spectroscopy can be constantly discharged and treated while maintaining a constant pressure difference (less than 1 bar / g). When the shut-off valve selected in the dumping operation of the reducing furnace 10 is opened, the high-temperature reducing spectroscopy and the reducing gas are mixed and flow into the dry-type storage tank 20. Here, the amount of the reducing spectroscopy and the amount of the reducing gas introduced into the dry type storage tank 20 is adjusted by using the pressure difference between the front end and the rear end of the dry type storage tank 20 through the control valve 30.

Meanwhile, in the reduced iron manufacturing method, iron ores can be cooled by supplying a cooling gas to the dry storage tank 20 during the cooling and storage of the iron ores in the dry storage tank 20. The high-temperature reduced spectroscopy separated through the reducing furnace (10) is naturally cooled slowly during operation in the dry storage tank (20). When cooling and discharging are required quickly depending on the operating conditions, it can be forcedly cooled by nitrogen gas or process gas, which is nonreducing gas.

The cooling gas according to the embodiment of the present invention may be made of a non-reducing gas, and the non-reducing gas may be made of nitrogen gas. The flow rate of the cooling gas into the dry storage tank 20 can be controlled according to the amount of iron ore that flows into the dry storage tank 20.

When the reduced spectroscopy is cooled to 130 ° C or lower, it is discharged to the outside by a screw feeder or a rotary feeder, which is an ore discharger 16 mounted on the lower part. Ore discharged to the outside is recycled. It can be fed directly to the reduction furnace 10 or can be agglomerated and utilized in the process of manufacturing a molten iron.

And a wet cooling facility using process water is unnecessary. For example, there is no need for a water treatment facility for dumping operations in case of facility shutdown and abnormalities in reduced iron manufacturing process. For this reason, the apparatus and method for manufacturing reduced iron according to the embodiment of the present invention and the apparatus and method for manufacturing molten iron using the same can recycle the reduced spectra without loss, thereby improving the environment, recycling resources, and reducing energy consumption.

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, It is natural to belong to the scope.

1 is a view showing a connection relationship between a reduction furnace, a dry storage tank, and a water collecting device in a reduced iron manufacturing apparatus according to a first embodiment of the present invention.

2 is an apparatus for manufacturing reduced iron according to a second embodiment of the present invention, which further includes an external cyclone in the first embodiment.

3 is a view showing a connection relationship between a packed bed type reducing furnace, a dry type storage tank, and a water collecting device in a reduced iron manufacturing apparatus according to a third embodiment of the present invention.

4 is a view showing a state where the reduced iron manufacturing apparatus according to the first embodiment of the present invention is connected to the molten iron manufacturing apparatus.

Description of the Related Art

10; Reduction furnace 12; Dumping piping

14; A water collector 16; Ore ejector

20; Dry storage tank 22; Internal cyclone

40; A gas supply pipe 26; External cyclone

30; Control valve

Claims (27)

One or more reduction furnaces for producing reduced iron by reducing iron ore, A dry storage tank connected to the reducing furnace and cooling and storing the iron ores discharged from the reducing furnace, A dumping pipe connecting the reducing furnace and the dry storage tank and guiding the flow of the iron ores that are opened only when dumping the reducing furnace and discharged from the reducing furnace to the dry storage tank, And a dust collector connected to the dry storage tank for wet-dusting the dust discharged from the dry storage tank, / RTI > Wherein the dry reservoir includes an inner cyclone disposed therein, the inner cyclone separating the dust from the iron ore, Wherein the dry storage tank includes a gas supply pipe for supplying a cooling gas into the dry storage tank to cool the iron ore, Further comprising an external cyclone located between the dry storage tank and the water collection tank for filtering the dust discharged from the dry storage tank and returning the filtered dust to the dry storage tank so that the spectra and gas flowing into the dry storage tank are mixed with the internal cyclone, A reduced-iron manufacturing device for phased separation of external cyclones. delete The method according to claim 1, Wherein the dry storage tank is provided with a discharge port for discharging the iron ores separated from the dust to the outside. The method of claim 3, And the temperature of the iron ores discharged through the discharge port is 130 degrees or less. delete The method according to claim 1, Further comprising a control valve located between the dry storage tank and the water collecting device and controlling a transfer pressure of dust discharged from the external cyclone to the water collecting device. The method according to claim 6, Wherein the feed pressure of the dust discharged to the dust collector is controlled in the range of 0.1 bar to 1.5 bar. delete The method according to claim 1, And the water collecting device wet-dusts the exhaust gas discharged from the reducing furnace. The method according to claim 1, Wherein the reducing furnace is a fluidized-bed reduction furnace including a plurality of reducing furnaces. delete The method according to claim 1, Wherein the reducing furnace is a packed-bed reduction reactor. One or more reduction furnaces for producing reduced iron by reducing iron ore, A melter-gasifier connected to the reduction furnace and supplied with the reduced iron to melt the reduced iron to produce molten iron; A dry storage tank connected to the reducing furnace and cooling and storing the iron ores discharged from the reducing furnace, A dumping pipe connecting the reducing furnace and the dry storage tank and guiding the flow of the iron ores that are opened only when dumping the reducing furnace and discharged from the reducing furnace to the dry storage tank, And a dust collector connected to the dry storage tank for wet-dusting the dust discharged from the dry storage tank, / RTI > Wherein the dry reservoir includes an inner cyclone disposed therein, the inner cyclone separating the dust from the iron ore, Wherein the dry storage tank includes a gas supply pipe for supplying a cooling gas into the dry storage tank to cool the iron ore, Further comprising an external cyclone located between the dry storage tank and the water collection tank for filtering the dust discharged from the dry storage tank and returning the filtered dust to the dry storage tank so that the spectra and gas flowing into the dry storage tank are mixed with the internal cyclone, And a step of separating the external cyclone while passing through the external cyclone. A step of reducing iron ore and discharging iron ore from at least one reducing furnace made of reduced iron, Cooling and storing the discharged iron ores in a dry storage tank connected to the reducing furnace, Separating dust from the iron ore using an internal cyclone installed in the dry storage tank, Separating the spectra and gas flowing into the dry storage tank step by step through the inner cyclone and the outer cyclone using an outer cyclone for filtering the dust discharged from the dry storage tank and returning the filtered dust to the dry storage tank, , And Wet-dusting the dust discharged from the dry storage tank in a water collector connected to the dry storage tank / RTI > Discharging the iron ores through the dumping pipe guiding the flow of the iron ores that are opened only at the time of dumping the reducing furnace and discharged from the reducing furnace to the dry storage tank in the step of discharging iron ores from the reducing furnace, And cooling the iron ores in the dry storage tank, and cooling the iron ores by supplying a cooling gas to the dry storage tank. delete 15. The method of claim 14, Wherein the cooling gas is a non-reducing gas. 17. The method of claim 16, Wherein the non-reducing gas is a nitrogen gas. 15. The method of claim 14, Wherein the inflow amount of the cooling gas into the dry storage tank is controlled according to the amount of the iron ores flowing into the dry storage tank. delete delete 15. The method of claim 14, Further comprising the step of adjusting a transfer pressure of dust discharged to the dust collector. 15. The method of claim 14, Further comprising wet scrubbing the exhaust gas discharged from the reducing furnace by the water purifier. 15. The method of claim 14, Wherein the iron ores are converted into the reduced iron while flowing in the reducing furnace. 15. The method of claim 14, Wherein the at least one reducing furnace includes a plurality of mutually connected reducing furnaces, and the iron ores are reduced while being sequentially passed through the plurality of reducing furnaces. 15. The method of claim 14, Wherein the iron ores are converted into the reduced iron in a state of being filled in the reducing furnace. 15. The method of claim 14, Wherein the iron ores are discharged when the reducing furnace is started, stopped, or abnormal. A step of reducing iron ore and discharging iron ore from at least one reducing furnace made of reduced iron, Wherein the melter-gasifier connected to the reduction furnace supplies molten iron to the reduced iron to produce molten iron, Cooling and storing the discharged iron ores in a dry storage tank connected to the reducing furnace, Separating dust from the iron ore using an internal cyclone installed in the dry storage tank, Separating the spectra and gas flowing into the dry storage tank step by step through the inner cyclone and the outer cyclone using an outer cyclone for filtering the dust discharged from the dry storage tank and returning the filtered dust to the dry storage tank, , And And wet-dusting the dust discharged from the dry storage tank in a water collector connected to the dry storage tank, Discharging the iron ores through the dumping pipe guiding the flow of the iron ores that are opened only at the time of dumping the reducing furnace and discharged from the reducing furnace to the dry storage tank in the step of discharging iron ores from the reducing furnace, And cooling and storing the iron ores in the dry storage tank, wherein cooling gas is supplied to the dry storage tank to cool the iron ores.

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