KR100851806B1 - Apparatus for manufacturing molten irons and method for manufacturing molten irons using the same - Google Patents

Abstract

The present invention relates to a molten iron manufacturing apparatus and a method for manufacturing molten iron using the same that can increase the number of continuous operating days of the flow reduction reactor. The apparatus for manufacturing molten iron according to the present invention includes one or more fluid reduction reactors for reducing and converting the iron ore into a reducing body, a iron ore storage tank for supplying the iron ore to the fluid reducing reactor, a bulk coal material and a reducing body are charged, and oxygen is blown into the molten iron. And a reducing gas supply pipe for directly supplying the reducing gas discharged from the molten gasifier to each of the flow reducing reactors by directly connecting the melt gasification furnace with each flow reducing reactor.

Flow Reduction Furnace, Iron Iron Ore, Reducing Body, Reducing Gas, Melting Gas Furnace, Reducing Gas Supply Pipe

Description

Apparatus for manufacturing molten iron and method for manufacturing molten iron using same {APPARATUS FOR MANUFACTURING MOLTEN IRONS AND METHOD FOR MANUFACTURING MOLTEN IRONS USING THE SAME}

1 is a view schematically showing a molten iron manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating an enlarged flow reducing path of FIG. 1.

FIG. 3 is a view schematically illustrating a flow reduction reactor of FIG. 1, a reducing gas supply device and a reduction body discharge device around the flow reduction reactor.

4 is a view showing a state in which the entire flow reduction path of Figure 1 operates.

FIG. 5 is a view illustrating a state of operating the preheating reduction path, the first preliminary reduction path, and the second preliminary reduction path in the flow reduction path of FIG. 1.

FIG. 6 is a view illustrating a state in which a preheating reduction path and a first preliminary reduction path of the flow reduction path of FIG. 1 are operated.

FIG. 7 is a view illustrating a state in which the preheat reduction reactor of the flow reduction reactor of FIG. 1 is operated.

The present invention relates to an apparatus for manufacturing molten iron and a method for manufacturing molten iron using the same, and more particularly, to an apparatus for manufacturing molten iron and a method for manufacturing molten iron using the same, which can increase the number of continuous working days in a multistage flow reduction reactor.

The steel industry is a key infrastructure industry that supplies basic materials to the entire industry, such as automobiles, shipbuilding, home appliances, and construction, and is one of the oldest industries that has been with human development. Steel mills, which play a pivotal role in the steel industry, use molten iron and coal as raw materials to produce molten pig iron, which is then manufactured and supplied to each customer.

Currently, about 60% of the world's iron production comes from blast furnace methods developed since the 14th century. Blast furnace method is a method of manufacturing molten iron by reducing the iron ore to iron by putting together the coke prepared from the sintering process and the coke produced from the bituminous coal into the blast furnace. However, the blast furnace method requires a supplementary facility for the production of coke and sintered ore, and there is a serious problem of environmental pollution due to the supplementary facility.

In order to solve the problems of the blast furnace method, many countries around the world are putting a lot of effort in the development of the molten reduction steelmaking method. In the molten reduction steelmaking method, molten iron is produced in a molten gas furnace using direct coal as a fuel and a reducing agent, and ore directly as an iron source. Here, oxygen is blown through a plurality of tuyere provided on the outer wall of the melt gasification furnace to produce molten iron while burning the coal filling layer in the melt gasification furnace. Oxygen is converted to a high temperature reducing gas and sent to a plurality of flow reduction reactors, and the plurality of flow reduction reactors reduce and calcinate iron ore and secondary materials and are discharged to the outside.

The final flow reduction path in which the reducing gas is first introduced among the plurality of flow reduction reactors has the operating conditions of the highest temperature, the high pressure, and the high reduction rate, and a large amount of dust is included in the reducing gas blown. Final flow paths have shorter cleaning and maintenance cycles than other flow paths due to these operational instability. In order to clean and maintain the final flow path, the entire flow path must be emptied, so the final flow path provides the most frequent cause of downtime. Therefore, in the related art, due to the low operating days of the final flow reduction path, the operating days of the flow reduction path are shortened and the operation rate is lowered.

The present invention is to solve the above-mentioned problems, to provide a molten iron manufacturing apparatus that can increase the number of continuous operation days and increase the operation rate of the flow reduction reactor.

In addition, the present invention is to provide a method for manufacturing molten iron using the above-described molten iron manufacturing apparatus.

The apparatus for manufacturing molten iron according to the present invention includes one or more fluid reduction reactors for reducing and converting the iron ore into a reducing body, a iron ore storage tank for supplying iron ore to the fluid reduction reactor, and a bulk carbon material and a reducing agent are charged and oxygen is charged therein. A molten gas furnace for producing molten iron, and a reducing gas supply pipe for directly supplying the reducing gas discharged from the molten gasifier to each of the flow reduction reactors by directly connecting the melt gasification furnace and each flow reduction reactor.

The reducing gas supply pipe may include a reducing gas main supply pipe connected to a melt gasifier and a reducing gas sub supply pipe branched from the reducing gas main supply pipe and connected to each flow reduction path. The reducing gas main supply pipe and the reducing gas sub supply pipe meet to form a plurality of branching points, and a blow valve may be installed between each neighboring branching point. In addition, a blowdown valve may be installed in the reducing gas secondary supply pipe.

The molten iron manufacturing apparatus further comprises a charging hopper installed between the flow reduction reactor and the melt gasifier, and a reducing body discharge pipe for selectively discharging the reducing agent inside each flow reduction reactor to the charging hopper by directly connecting each flow reduction reactor and the charging hopper. It may include. The reducing valve may be provided with a discharge valve.

The molten iron manufacturing method according to the present invention comprises the steps of converting the iron ore to a reducing body while passing through a plurality of flow reduction reactor, charging the bulk gas and the reducing body into a melt gasifier connected to the flow reduction reactor, the oxygen into the molten gasifier Manufacturing molten iron by injecting the molten gas, and simultaneously supplying the reducing gas discharged from the molten gasifier to the two flow reducing reactors through a reducing gas supply pipe that directly connects the molten gasifier and each flow reduction reactor. have.

Still another aspect of the present invention provides a method for manufacturing molten iron, including: stopping a first flow reduction reactor among a plurality of flow reduction reactors including one or more first flow reduction reactors and one or more second flow reduction reactors; (2) converting the reducing material into a reducing body while passing through the fluid reducing reactor, charging the bulk carbon material and the reducing body into a molten gasifier connected to the fluid reducing reactor, and injecting oxygen into the molten gasifier to produce molten iron; And supplying the reducing gas discharged from the molten gasifier to the second flow reduction reactor through a reducing gas supply pipe that directly connects each flow reduction path.

Each flow reduction path may be directly connected to the charging hopper through a reducing body discharge pipe, and the charging hopper may be connected to the melt gasifier. In the step of converting the iron ore to the reducing body, only one second flow reduction reactor can discharge the reducing body to the charging hopper.

In the step of supplying the reducing gas to the second flow reduction path, the reducing gas may be simultaneously supplied to the two second flow reduction path.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 shows a molten iron manufacturing apparatus 100 according to an embodiment of the present invention. The apparatus for manufacturing molten iron 100 shown in FIG. 1 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the apparatus for manufacturing molten iron 100 may be modified in another form.

The apparatus for manufacturing molten iron 100 includes one or more flow reduction reactors 200, a melt gasifier 60, and a compacted material manufacturing apparatus 50. In addition to the compacted material manufacturing apparatus 50 may further include a high-temperature uniform back pressure device 55 for transferring the compacted material to the molten gas furnace 60. The compacted material manufacturing apparatus 50 and the high temperature uniform back pressure apparatus 55 can be abbreviate | omitted as needed. The high temperature uniform back pressure device 55 pumps the compacted body manufactured by the compacted body manufacturing apparatus 50 to the melt gasification furnace 60. For the sake of convenience, the reducing gas supply device and the reducing body discharge device around the flow reduction path 200 are omitted. This will be described in detail with reference to FIGS. 3 to 7 described later.

The flow reduction path 200 includes a preheating reduction path 10, a first preliminary reduction path 20, a second preliminary reduction path 30, and a final reduction path 40. Although four flow reduction paths 200 are sequentially shown in FIG. 1, this is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, three flow reduction reactors may be used.

Using molten iron ore as a raw material to produce molten iron through the molten iron manufacturing apparatus (100). First, the iron ore is dried and stored in the iron ore storage tank 45. If necessary, the subsidiary materials may be mixed with the iron ore and then dried. The iron ore is reduced and heated while passing through the flow reduction path 200 is converted into a reducing body. The iron ore is sequentially charged into the flow reduction paths 10, 20, 30, and 40 in which a fluidized bed is formed therein.

First, the preheating reduction furnace 10 preheats the iron ore by reducing gas. The preheated iron ore is charged in the first preliminary reduction path 20 and the second preliminary reduction path 30. Where the iron ore is preliminarily reduced. Pre-reduced iron ore is finally reduced by charging in the final reduction furnace 40 is converted into a reducing body. In order to produce a reducing body, a reducing gas is supplied from the melt gasification furnace 60 to the flow reduction reactor 200. The reduced body is made into a compacted body through the compacted body manufacturing apparatus 50. The reducing body may be charged directly into the melt gasifier 60 without passing through the compacted material manufacturing apparatus 50.

The compacted material manufacturing apparatus 50 includes the charging hopper 501, a pair of roll 503, the crusher 505, and the storage tank 507. The charging hopper 501 stores the reduced and calcined ore while passing through the flow reduction path 200. The iron ore is press-molded in a strip form while being charged into a pair of rolls 503 from the charging hopper 501. The pressed iron ore is crushed in the crusher 505 and stored in the storage tank 507.

On the other hand, the molten gasifier 60 charges the bulk carbon material from the upper portion to form a coal-filled layer therein. A plurality of air vents 601 are provided on the outer wall of the melt gasifier 60 to blow oxygen into the melt gasifier 60. As the coal-filled layer is burned by oxygen, a wet bed is formed. The compacted material manufactured in the compacted material manufacturing apparatus 50 is charged through the upper part of the melt gasifier 60 and melted and partially reduced while passing through the coal filling layer. This method can be used to produce molten iron. A hot water outlet is installed in the lower portion of the melt gasifier 60 to discharge molten iron and slag to the outside.

And a high-temperature reducing gas containing hydrogen and carbon monoxide is generated from the coal filling layer formed inside the melt gasifier (60). Since the upper portion of the melt gasifier 60 is formed in a dome shape, it is advantageous for generating reducing gas. The reducing gas discharged from the melt gasifier 60 is supplied to the flow reduction reactor 200. Therefore, the iron ore can be reduced and calcined by the reducing gas.

FIG. 2 is an enlarged view of the iron-iron ore transport structure and the reducing gas transport structure of the flow reduction path 200 shown in FIG. 1. In FIG. 2, only the parts related to the transfer of the ferrous iron ore and the reducing gas of the flow reduction path 200 are shown for convenience, and the remaining parts thereof are omitted for convenience. In FIG. 2, the thick solid line represents the reducing gas conveyance path, and the thin solid line represents the ferrite ore transport path.

First, the cyclone 401 and the dispersion plate 403 are installed in each of the flow reduction paths 10, 20, 30, and 40. Reducing gas is blown from the lower part of each flow reduction path (10, 20, 30, 40) and discharged to the upper part. Blown reducing gas is evenly distributed into the flow reduction path (10, 20, 30, 40) while passing through the distribution plate (403). Fluidized bed is formed by evenly distributed reducing gas and charged iron ore. The iron ore flows upward with exhaust gas, and the exhaust gas exits to the outside, and the iron ore is collected by the cyclone 401 and discharged to the lower portion of the cyclone 401.

The iron-iron ore transport pipe shown in FIG. 2 includes the first iron-iron ore transport pipes L101, L201, and L301 and the second iron-iron ore transport pipes L102, L202, L302, and L402. The first ferrous ore transport pipes L101, L201, and L301 connect neighboring flow reduction paths 10, 20, 30, and 40, respectively. Valves V101, V201, and V301 are installed in the first ferrite ore transport pipes L101, L201, and L301 to control the flow of the ferrite ore. Second ferrous ore transport pipe (L102, L202, L302, L402) is connected to each of the flow reduction path (10, 20, 30, 40) and the cooling tank (47). Valves V102, V202, V302, and V402 are also provided in each of the second ferrite ore transport pipes L102, L202, L302, and L402 to control the flow of the iron ore toward the cooling tank 47.

The reducing gas transfer pipes L103, L203, and L303 connect neighboring flow reduction paths 10, 20, 30, and 40, respectively. Valves V103, V203, and V303 are installed in the reducing gas transfer pipes L103, L203, and L303 to control the flow of the reducing gas. Since the reducing gas should be blown in the lower part of the flow reduction paths 10, 20, 30, and 40, the reducing gas transfer pipes L103, L203, and L303 may be used in the flow reduction paths 20, 30, and 40 of which the reducing gas is discharged. Connect the upper part and the lower part of the flow reduction furnace 10, 20, 30 through which the reducing gas is blown.

3 is an enlarged view of the flow reduction path 200 shown in FIG. 1, a reducing gas supply device and a reduction body discharge device around the flow reduction path. For convenience of illustration, the illustration of the second ferrous ore transport pipe and the cooling tank is omitted.

The reducing gas supply apparatus includes a reducing gas supply pipe. The reducing gas supply pipes L60, L104, L204, L304, L404 include a reducing gas main supply pipe L60 and a reducing gas sub supply pipe L104, L204, L304, L404. The reducing gas main supply pipe (L60) is connected to the melt gasifier (not shown), the reducing gas sub-supply pipes (L104, L204, L304, L404) branched from the reducing gas main supply pipe (L60) to each flow reduction path ( 10, 20, 30, 40).

The reducing gas main supply pipe L60 meets the reducing gas sub supply pipes L104, L204, L304, and L404 to form a plurality of branching points P601, P602, P603, and P604. Blowing valves V601, V602, and V603 are installed between neighboring branch points P601, P602, P603, and P604 to control the flow of reducing gas. In addition, inlet valves V604, V605, and V606 are provided in the reducing gas sub-supply pipes L204, L304, and L404 to control the flow of the reducing gas.

Therefore, not only the final reduction path 40 but also the preheating reduction path 10, the first preliminary reduction path 20, and the second preliminary reduction path 30 are provided through the reducing gas supply pipes L60, L104, L204, L304, and L04. Directly connected to the melt gasifier. In this way, it is possible to selectively control the reducing gas supply from the melt gasifier to each of the flow reduction reactors 10, 20, 30, and 40. It is also possible to simultaneously blow the reducing gas into two flow reduction reactors.

Reducing body discharge device is a reducing body discharge pipe (L105, L205, L305, L405) connecting each of the flow reduction path (10, 20, 30, 40) and the charging hopper 501, and each reducing body discharge pipe (L105, And discharge valves V105, V205, V305, and V405 installed at L205, L305, and L405 to control discharge of the reducing body. Therefore, each of the flow reduction paths 10, 20, 30, and 40 is directly connected to the charging hopper 501 through the reducing body discharge pipes L105, L205, L305, and L405.

The flow reduction path 200 may stop and clean and maintain two or more flow reduction paths including the final reduction path 40 or the final reduction path 40 by the above-described reducing gas supply device and the reducing body discharge device. have. During this period, the remaining flow reduction reactor can be operated to produce a reducing body.

4 shows a state in which the entire flow reduction path 200 is operated. If you want to operate the entire flow reduction reactor 200, charged iron ore is charged to the preheating reduction furnace 10 from the iron-iron ore storage tank 45. Then, all of the iron ore charged in the preheating and reducing furnace 10 by opening all the valves V101, V201, and V301 of the first iron ore conveying pipe L101, L201, and L301 is transferred to the remaining flow reducing reactors 20, 30, and 40. To be loaded sequentially. At this time, the valves (V101, V202, V302, V402) of the second iron ore transfer pipe (L102, L202, L302, L402) connecting each of the flow reduction paths (10, 20, 30, 40) and the cooling tank (47). Closes.

In the reducing gas supply device, only the intake valve V606 associated with the reduction gas supply of the final reduction path 40 is opened to supply the reduction gas to the final reduction path 40. And by closing the intake valve (V603) so that the reducing gas is not directly supplied to the remaining flow reduction path (10, 20, 30). In addition, the reducing gas blown into the final reduction path 40 by opening all the valves V103, V203, and V303 of the reducing gas transfer pipes L103, L203, and L303 are sequentially provided to the remaining flow reduction paths 30, 20, and 10. To be blown.

On the other hand, by opening the blow valves (V606, V603, V605) associated with the supply of the reducing gas of the final reduction path 40 and the second preliminary reduction path 30, the final reduction path 40 and the second preliminary reduction path 30 ) Can be supplied simultaneously with reducing gas. In this case, the reduction burden of the final reduction path 40 can be reduced. 4 shows a state in which reducing gas is blown only to the final reduction path 40.

In the reducing body discharge device, only the discharge valve V405 associated with the reduction body discharge of the final reduction path 40 is opened, and only the reducing body in the final reduction path 40 is closed by closing the remaining discharge valves V105, V205, and V305. It is discharged to the charging hopper (501). Through this process it is possible to produce a reducing body. On the other hand, if the situation to clean and maintain the final reduction path 40 during the operation of the above-described flow reduction path 200, stop the final reduction path 40, the remaining flow reduction path (10, 20, 30) Can be operated continuously.

5 shows a state in which the final reduction path 40 is stopped and the preheating reduction path 10, the first preliminary reduction path 20, and the second preliminary reduction path 30 are operated. When the final reduction path 40 is to be maintained, the second preliminary reduction path 30 and the final reduction path 40 among the valves V101, V201, and V301 of the first ferrous ore transport pipe L101, L201, and L301 are used. Close the valve (V301) between. This may block the loading of the iron ore into the final reduction path 40. After that, only the valve V402 connecting the final reduction path 40 and the cooling tank 47 among the valves V102, V202, V302, and V402 of the second ferrous ore transport pipe L102, L202, L302, and L402 is opened. Close all remaining valves (V102, V202, V302). Thus, all the iron ore in the final reduction path 40 is discharged to the cooling tank 47 to empty the final reduction path (40).

Then, in the reducing gas supply device, the intake valve V606 associated with the reduction gas supply of the final reduction path 40 is closed to prevent the reduction gas from being supplied to the final reduction path 40. Then, the inlet valves V603 and V605 associated with the supply of the reducing gas to the second preliminary reduction path 30 are opened to blow the reducing gas into the second preliminary reduction path 40. On the other hand, the reducing gas may be simultaneously supplied to the first preliminary reduction path 20 and the second preliminary reduction path 30.

Further, the valve V303 between the final reduction path 40 and the second preliminary reduction path 30 among the valves V103, V203, V303 of the reducing gas transfer pipes L103, L203, L303 is closed to close the final reduction path ( 40) the inside of the reducing gas is prevented from being blown into the second preliminary reduction path (30).

In the reducing body discharge device, only the discharge valve V305 associated with the reduction body discharge of the second preliminary reduction path 30 is opened, and the remaining discharge valves V105, V205, and V405 are closed to close the inside of the second preliminary reduction path 30. The reducing body is discharged to the charging hopper 501. In the above-described process, the second preliminary reduction reactor 30 functions as a final reduction reactor, and the reducing bodies may be manufactured by operating three flow reduction reactors 10, 20, and 30.

As such, the ore loading and gas flow of the final reduction path 40 are blocked, and the final reduction path 40 is cleaned and maintained as the final reduction path 40 is emptied.

If it is necessary to clean and maintain the second preliminary reduction path 30 again during the operation of the above-described flow reduction path 200, the operation of the second preliminary reduction path 30 is stopped, and the preheating reduction path 10 And the first preliminary reduction path 20 can be operated continuously.

6 shows a state in which the final reduction path 40 and the second preliminary reduction path 30 are stopped and the preheat reduction path 10 and the first preliminary reduction path 20 are operated. When the second preliminary reduction path 30 is to be maintained, the first preliminary reduction path 20 and the second preliminary reduction of the valves V101, V201, and V301 of the first ferrous ore transport pipe L101, L201, and L301 may be used. The valve V201 between the furnace 30 is closed. Then, the ferrite ore may be blocked from being charged into the second preliminary reduction path 30. After that, only the valve V302 connecting the second preliminary reduction path 30 and the cooling tank 47 among the valves V102, V202, and V302 of the second ferrous ore transfer pipe L102, L202, and L302 is opened, and the remaining valves are opened. Close all of (V102, V202). Thus, all of the iron ore in the second preliminary reduction path 30 is discharged to the cooling tank 47 to empty the second preliminary reduction path 30.

Then, the reducing gas supply device closes the blow valves V605 and V606 associated with the supply of the reducing gas of the final reduction path 40 and the second preliminary reduction path 30, and supplies the reducing gas of the first preliminary reduction path 20. Blowing gas (V602, V603, V604) associated with the blowing gas to the first pre-reduction path (20). On the other hand, reducing gas may be simultaneously supplied to the preheating reduction path 10 and the first preliminary reduction path 920. In addition, the valve V203 between the first preliminary reduction passage 20 and the second preliminary reduction passage 30 among the valves V103, V203, and V303 of the reducing gas transfer pipes L103, L203, and L303 is closed to obtain a second valve. The reducing gas in the preliminary reduction path 30 is prevented from being blown into the first preliminary reduction path 20.

In the reducing body discharge device, only the discharge valve V205 associated with the reduction body discharge of the first preliminary reduction path 20 is opened, and the remaining discharge valves V105, V305, and V405 are closed to close the inside of the first preliminary reduction path 20. The reducing body is discharged to the charging hopper 501. In the above-described process, the first preliminary reduction reactor 20 functions as a final reduction reactor, and the reducing body may be manufactured by operating two flow reduction reactors 10 and 20.

As such, the second preliminary reduction path 30 is cleaned and maintained as the ore loading and gas flow of the second preliminary reduction path 30 are blocked and the second preliminary reduction path 30 is emptied. If it is necessary to clean and maintain the first preliminary reduction path 20 again during the operation of the above-described flow reduction path 200, the operation of the first preliminary reduction path 20 is stopped, and the preheating reduction path 10 The bay can be operated continuously.

7 shows a state in which only the preheating reduction path 10 operates. When the first preliminary reduction path 20 is to be maintained, the first preliminary reduction path 20 and the preheating reduction path among the valves V101, V201, and V301 of the first ferrous ore transport pipe L101, L201, and L301 may be 10) Close the valve (V101). Then, the first preliminary reduction path 20 may block the loading of the iron ore. Thereafter, a valve V202 connecting the first preliminary reduction path 20 and the cooling tank 47 among the valves V102, V202, V302, and V402 of the second ferrous ore transport pipe L102, L202, L302, and L402. Only open and close the remaining valves. Thus, the first preliminary reduction path 20 is emptied by discharging all the iron ore in the first preliminary reduction path 20 to the cooling tank 47.

Then, the reducing gas supply device closes the blow valves (V604, V605, V606) associated with the reducing gas supply of the final reduction path 40, the second preliminary reduction path 30 and the first preliminary reduction path 20, and preheats Intake valves V601, V602, V603 associated with the supply of reducing gas to the reduction furnace 10 are opened to reduce the blowing gas into the preheat reduction and reduction furnace 10. In addition, all the valves V103, V203, and V303 of the reducing gas transfer pipes L103, L203, and L303 are closed.

In the reducing body discharge device, only the discharge valve V105 associated with the reduction body discharge of the preheat reduction reactor 10 is opened, and the remaining discharge valves V205, V305, and V405 are closed to charge the reducing body in the preheat reduction reactor 10. The hopper 501 is discharged. In the above-described process, the preheating reduction path 10 functions as the final reduction path.

As described above, the first preliminary reduction path 20 is cleaned and maintained as the first preliminary reduction path 20 is emptied while the ore loading and gas flow of the first preliminary reduction path 20 are blocked.

The molten iron manufacturing apparatus 100 uses the reducing gas supply device and the reducing body discharge device to clean the remaining flow reduction path during the cleaning and maintenance of two or more flow reduction paths including the final reduction path 40 or the final reduction path 40. Can be operated. Therefore, it is possible to increase the number of consecutive operating days of the flow reduction path 200 and increase the operation rate.

Hereinafter, the present invention will be described through experimental examples of the present invention. Such experimental examples of the present invention are merely for illustrating the present invention, and the present invention is not limited thereto.

Experimental Example

The following experiment was performed using the apparatus for manufacturing molten iron having the structure of FIG. 3 described above. The supply pressure of the reducing gas was 3.0 bar, and the gas flow rate of the exhaust gas was 160,000 Nm ³ / hr. The internal temperature of the preheat reduction furnace was maintained at 450 ° C., the internal temperature of the first preliminary reduction reactor was 700 ° C., and the internal temperatures of the second preliminary reduction reactor and the final reduction reactor were at 750 ° C. Other experimental conditions can be easily understood by those of ordinary skill in the art to which the detailed description thereof will be omitted.

Experimental Example 1

After reducing gas was produced by operating four flow reducing reactors, the reducing gas was stopped using the reducing gas supply device and the reducing gas exhaust device shown in FIG. .

Experimental Example 2

When four reducing reactors were operated to produce a reducing body, the reducing gas was simultaneously blown into the final reducing furnace and the second preliminary reducing reactor using the reducing gas supply device shown in FIG. 3.

Comparative Example 1

After heating the four flow reduction reactors to produce a reducing body, all four flow reduction reactors were shut down for cleaning and maintenance of the final reduction reactor.

Comparative Example 2

When the four flow reduction reactors were operated to produce a reducing body, the reducing gas was blown only into the final reduction reactor.

Table 1 below compares the results of the continuous operation days of the flow reduction reactor according to Experimental Example 1 and Comparative Example 1 described above.

Item Experimental Example 1 Comparative Example 1 Continuous working days 150 80

As shown in Table 1, in Experimental Example 1 of the present invention, the number of continuous operation days in the fluid reduction furnace was significantly increased as compared with the conventional Comparative Example 1. Accordingly, it was possible to produce a reducing body during cleaning and maintenance of a specific flow reduction reactor, and to carry out long-term operation of the flow reduction reactor.

In addition, it is shown in Table 2 below by comparing the reduction rate results of the reducing agent according to the above Experimental Example 2 and Comparative Example 2.

Item Experimental Example 2 Comparative Example 2 Continuous working days 120 80 Reduction rate (%) 71 70

As shown in Table 2, in the case of Experimental Example 2 of the present invention, it was confirmed that the number of continuous operating days significantly increased and the reduction rate of the reducing body was increased as compared with the conventional Comparative Example 2. This is due to the reduction of the reduction to the final reduction.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

In the apparatus for manufacturing molten iron according to the present invention, since it is possible to manufacture a reducing body by operating another flow reduction reactor while cleaning and maintaining one or more flow reduction reactors, the number of continuous operation days of the flow reduction reactor is greatly increased. In addition, by branching the reducing gas to at least one flow reduction reactor at the same time to reduce the reduction burden of the specific flow reduction reactor, it is possible to improve the reduction rate of the reducing body.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (10)

One or more flow reduction reactors that reduce the iron ore and convert it into a reducing body, Powdered iron ore storage tank for supplying the iron ore to the flow reduction path, A molten gasification furnace in which a bulk carbon material and the reducing body are charged and oxygen is blown to produce molten iron, A reducing gas supply pipe for directly supplying the reducing gas discharged from the molten gasifier to each of the flow reducing reactors by directly connecting the melt gasifier and the respective flow reduction reactors; A charging hopper installed between the flow reduction path and the melt gasification furnace, and Reductant discharge pipe for selectively discharging the reducing agent in each of the flow reduction path to the charging hopper by directly connecting the flow reduction path and the charging hopper Iron manufacturing apparatus comprising a. The method of claim 1, The reducing gas supply pipe, A reducing gas main supply pipe connected to the molten gasifier, and A reducing gas sub-supply pipe branched from the reducing gas main supply pipe and connected to each of the flow reduction paths. Iron manufacturing apparatus comprising a. The method of claim 2, The reducing gas main supply pipe and the reducing gas sub-supply pipe meet to form a plurality of branch points, the molten iron manufacturing apparatus is provided with a blow valve between each adjacent branch point. The method of claim 2, The molten iron manufacturing apparatus is installed in the reducing gas secondary supply pipe. delete The method of claim 1, The molten iron manufacturing apparatus is provided with a discharge valve in the reducing body discharge pipe. delete i) a plurality of flow reduction reactors comprising at least one first flow reduction reactor and at least one second flow reduction reactor, ii) a reducing body discharge pipe for transporting the reducing bodies discharged from the plurality of flow reduction reactors, iii) the reduction A charge hopper connected to the plurality of flow reduction paths through a sieve discharge pipe, and iv) a melt gasification furnace connected to the charge hopper. Providing a molten iron manufacturing apparatus comprising a, Stopping the one or more first flow reduction paths of the plurality of flow reduction paths, Converting the iron ore into a reducing body while passing only the one or more second flow reduction reactors, and then discharging the reducing body to the charging hopper; Charging a lumped carbonaceous material and the reducing body into the molten gasifier, and injecting oxygen into the molten gasifier to produce molten iron; and Supplying the reducing gas discharged from the molten gasifier to the at least one second flow reduction reactor through a reducing gas supply pipe connecting the melt gasifier and the plurality of flow reduction reactors, respectively. Iron manufacturing method comprising a. delete The method of claim 8, In the step of supplying the reducing gas to the second flow reduction path, molten iron manufacturing method for supplying the reducing gas to the at least one second flow reduction path at the same time.

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