Sub material feeding device of electric furnace and electric furnace having same

Abstract

A sub material feeding device of an electric furnace and an electric furnace having same are disclosed. The sub material feeding device of an electric furnace, according to one embodiment, comprises: a chute that supplies sub material to a sub material input port provided in a roof of an electric furnace body from above the sub material input port; and a sub material feeder that supplies the sub material to the chute from above the chute, wherein the chute includes: an upper inlet that receives the sub material from the sub material feeder; a lower outlet that supplies the sub material to the sub material input port; and a connecting portion that connects and provides communication between the inlet and the outlet, wherein the outlet is configured to be ventilated in a vertical direction, and the connecting portion communicates with the outlet through a side surface of the outlet and is provided with an injection port for injecting air downward, wherein the injection port may include a first injection port disposed in an upper region of the connecting portion.

Description

A raw material input device for an electric furnace and an electric furnace equipped with the same

[0001] The present disclosure relates to a raw material input device for an electric furnace installed for inputting raw materials into an electric furnace and an electric furnace equipped with the same.

[0002] Typically, an electric furnace uses an arc generated by an electrode to melt scrap fed into the furnace body. The scrap is melted to form molten steel, and when the molten steel is completely melted, auxiliary materials are added to the furnace body.

[0003] The auxiliary materials can perform functions such as deoxidation and desulfurization to remove impurities from the molten steel and control the carbon content of the molten steel.

[0004] A raw material inlet is provided on the roof of the upper part of the furnace to allow raw materials to be fed into the furnace, and the electric furnace is equipped with a raw material feeding device to supply raw materials to the raw material inlet.

[0005] The raw material feeder comprises a chute for supplying raw materials from the upper portion of the raw material feeder to the raw material feeder inlet, and a raw material feeder installed above the chute to supply raw materials to the chute. Raw materials supplied to the chute through the raw material feeder are fed along the chute to the raw material feeder inlet and then fed into the furnace body.

[0006] At this time, heat or flames generated within the furnace body may rise through the raw material inlet and be discharged upward through the chute. Heat or flames discharged to the upper part of the chute may deteriorate the durability of the raw material feeder installed at the upper part of the chute, such as by causing deformation or damage to the raw material feeder.

[0007] One aspect of the present disclosure provides an electric furnace having an improved structure for preventing durability from being reduced by heat or flame generated inside the furnace body when raw materials are introduced, and an electric furnace having the same.

[0008] According to the idea of ​​the present disclosure, an electric furnace raw material input device includes a chute for supplying raw materials to a raw material input port provided in a roof of an electric furnace body from an upper portion thereof; and a raw material supply device for supplying raw materials to the chute from an upper portion thereof, wherein the chute includes an upper inlet portion for receiving raw materials from the raw material supply device; a lower outlet portion for supplying raw materials to the raw material input port; and a connecting portion for connecting and communicating between the inlet portion and the outlet portion; wherein the outlet portion is provided to be ventilated in an up-and-down direction, the connecting portion communicates with the outlet portion through a side surface of the outlet portion, and an injection port for injecting air downwardly is provided in the connecting portion inside the connecting portion, and the injection port may include a first injection port arranged in an upper region of the connecting portion.

[0009] The above first nozzles may be arranged in plurality along the perimeter of the upper region.

[0010] The above first nozzle can inject air diagonally toward the inner surface of the upper region.

[0011] The above nozzle may further include a second nozzle disposed between the upper region and the lower region of the connecting portion.

[0012] In addition, a raw material input device of an electric furnace according to the invention includes a chute for supplying raw materials to a raw material input port provided in a roof of an electric furnace body from an upper portion thereof; and a raw material supply device for supplying raw materials to the chute from an upper portion thereof, wherein the chute includes an upper inlet portion for receiving raw materials from the raw material supply device; a lower outlet portion for supplying raw materials to the raw material input port; and a connecting portion for connecting and communicating between the inlet portion and the outlet portion; wherein the outlet portion is provided to be ventilated in an up-and-down direction, the connecting portion communicates with the outlet portion through a side surface of the outlet portion, and a connecting portion for connecting the inside and the outside of the outlet portion is provided on the side surface of the outlet portion, and the connecting portion can be disposed below a position at which the connecting portion is connected.

[0013] The above-mentioned communication portion may include a through hole penetrating the side surface of the outlet portion.

[0014] The above-mentioned communication portion may include an extension pipe formed to extend from the side of the outlet portion.

[0015] In addition, a raw material input device of an electric furnace according to the idea of ​​the present disclosure includes a chute for supplying raw materials to a raw material input port provided in a roof of an electric furnace body from an upper portion thereof; and a raw material supply device for supplying raw materials to the chute from an upper portion thereof; wherein the chute includes an upper inlet portion for receiving raw materials from the raw material supply device; a lower outlet portion for supplying raw materials to the raw material input port; and a connecting portion for connecting and communicating between the inlet portion and the outlet portion; wherein the outlet portion is provided to be ventilated in an up-and-down direction, and the connecting portion communicates with the outlet portion through a side surface of a central portion between the upper and lower portions of the outlet portion, and the outlet portion may form a venturi tube having an inner diameter of a central portion smaller than that of the upper and lower portions.

[0016] An electric furnace according to the invention comprises: a furnace body having a raw material input port provided in a loop in which an electrode rod is installed; a scrap supply device having a scrap supply path connected to a side of the furnace body to supply scrap to the furnace body; a dust collector for collecting waste gas generated in the furnace body so that it passes through the scrap supply path; and a raw material input device for inputting raw materials into the furnace body; wherein the raw material input device comprises: a chute for supplying raw materials to the raw material input port from above the raw material input port; and a raw material supplyer for supplying raw materials to the chute from above the chute; wherein the chute comprises: an upper inlet for receiving raw materials from the raw material supplyer; an outlet for supplying raw materials to the raw material input port; and a connecting portion for connecting and communicating between the inlet portion and the outlet portion; wherein the connecting portion is in communication with the outlet portion through a side of the outlet portion, and the outlet portion may be provided to be ventilated in an up-and-down direction.

[0017] According to the present disclosure, an electric furnace having an improved structure for feeding raw materials to prevent durability from being reduced due to heat or flame generated inside the furnace body when feeding raw materials, and an electric furnace having the same can be provided.

[0018] Figure 1 illustrates an electric furnace according to one embodiment.

[0019] Figure 2 illustrates a raw material input device for an electric furnace according to one embodiment.

[0020] Figure 3 shows the structure of the lower part of the chute of the raw material input device of an electric furnace according to one embodiment, together with the structure of the upper part of the raw material input port.

[0021] Figure 4 illustrates a modified example of a raw material input device for an electric furnace according to one embodiment.

[0022] Figure 5 shows the first nozzle illustrated in Figure 4 and the injection path of air injected from the first nozzle.

[0023] Figures 6 and 7 illustrate another modified example of a raw material input device for an electric furnace according to one embodiment.

[0024] Figure 8 illustrates another modified example of a raw material input device for an electric furnace according to one embodiment.

[0025] Throughout the specification, the same reference numerals denote the same components. This specification does not describe all elements of the embodiments, and any content that is general in the technical field to which the present invention pertains or that overlaps between the embodiments is omitted. The terms 'part, module, element, block' used in the specification may be implemented in software or hardware, and depending on the embodiments, multiple 'parts, modules, elements, blocks' may be implemented as a single component, or a single 'part, module, element, block' may include multiple components.

[0026] Throughout the specification, when a part is said to be "connected" to another part, this includes not only direct connection but also indirect connection, and indirect connection includes connection via a wireless communication network.

[0027] Additionally, when a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0028] Throughout the specification, when it is said that an element is "on" another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0029] The terms first, second, etc. are used to distinguish one component from another, and the components are not limited by the aforementioned terms.

[0030] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0031] The identification codes in each step are used for convenience of explanation and do not describe the order of each step, and each step may be performed in a different order than specified unless the context clearly indicates a specific order.

[0032] The term “and / or” may include any combination of multiple related described elements or any one of multiple related described elements.

[0033] Hereinafter, embodiments according to the present disclosure will be described with reference to the attached drawings.

[0034] Figure 1 illustrates an electric furnace according to one embodiment of the present disclosure.

[0035] Referring to FIG. 1, an electric furnace (1) according to one embodiment of the present disclosure may include a furnace body (2), a scrap supply device (3) for supplying scrap (a) to the furnace body (2), and a dust collector (4) for collecting waste gas generated in the furnace body (2).

[0036] An electrode rod (5) may be installed on the loop (2a) on the upper part of the furnace body (2). One or more electrode rods (5) may be provided. The electrode rod (5) can generate an arc to heat scrap (a) supplied to the furnace body (2). The electrode rod (5) can form an arc between itself and the scrap (a) by using the applied arc voltage.

[0037] The scrap supply device (3) may include a scrap supply path (3a) connected to the side of the body (2) and a scrap feeder (3b) that supplies scrap (a) to the scrap supply path (3a).

[0038] The scrap feeder (3b) may be provided as a conveyor. For example, the conveyor may include a roller conveyor, a belt conveyor, and a chain conveyor.

[0039] The scrap supply path (3a) may be formed to cover the movement path of scrap (a) supplied to the body (2) by the scrap feeder (3b), or may be provided in a form that accommodates the scrap feeder (3b) inside.

[0040] Scrap (a) supplied through a scrap feeder (3b) can be supplied to the furnace body (2) along a scrap supply path (3a). The scrap (a) supplied to the furnace body (2) can be heated by an arc generated by an electrode rod (5) and melted to form molten steel.

[0041] The dust collector (4) may include a dust collector (4a), a collector (4b), and a blower (4c). The dust collector (4a) is provided to communicate with the inside of the furnace body (2), and the blower (4c) can generate a suction force to cause waste gas generated inside the furnace body (2) to be sucked into the dust collector (4a). The collector (4b) is installed to communicate with the dust collector (4a) and can collect and remove dust from the waste gas sucked along the dust collector (4a). The waste gas inside the furnace body (2) passes through the dust collector (4) and can be discharged to the outside through a stack (not shown) in a state where the dust has been removed.

[0042] The dust collector (4) may be arranged to preheat the scrap (a) as the waste gas collected from the furnace body (2) passes through the scrap supply path (3a). The scrap (a) preheated by the waste heat of the waste gas can have improved melting efficiency.

[0043] The dust collection path (4a) of the dust collector (4) can be connected to the scrap supply path (3a). For example, the dust collection path (4) can be connected to the middle of the scrap supply path (3a) so as to be connected to the scrap supply path (3a).

[0044] Accordingly, the waste gas passes through the scrap supply path (3a) in the process of moving to be collected in the dust collector (4a) inside the furnace body (2), and the scrap (a) supplied to the furnace body (2) along the scrap supply path (3a) can be preheated by the waste gas passing through the scrap supply path (3a). For reference, the dotted arrow in Fig. 1 indicates the path along which the waste gas is collected.

[0045] Scrap (a) preheated with waste gas can be quickly melted to form molten steel by the arc of the electrode rod (5) while being supplied to the furnace body (2).

[0046] At the point when the melting of the molten steel is completed, a secondary raw material (b) may be added to the furnace body (2). The secondary raw material (b) may perform functions such as deoxidation and desulfurization to remove impurities from the molten steel and control the carbon content of the molten steel. Quicklime, dolomite, lump coal, etc. may be used as the secondary raw material (b).

[0047] The electric furnace (1) may include a raw material input device (10) for inputting raw material (b). A raw material input port (6) is provided in a loop (2a) on the upper part of the furnace body (2), and the raw material input device (10) may supply raw material (b) to the raw material input port (6) so that raw material (b) is input into the furnace body (2).

[0048] The raw material inlet (6) may be provided in the form of a square tube with a hollow interior. The raw material inlet (6) may have an expanded upper portion to facilitate the supply of raw material (b) from the raw material inlet device (10). The raw material inlet (6) may be provided in the form of a square tube with a rectangular cross-section.

[0049] Hereinafter, with reference to FIG. 2, a raw material input device (10) of an electric furnace according to one embodiment of the present disclosure will be described in detail.

[0050] The raw material input device (10) may include a chute (20) that supplies raw material (b) from above the raw material input port (6) to the raw material input port (6), and a raw material supply device (30) that supplies raw material (b) from above the chute (20) to the chute (20).

[0051] The raw material feeder (30) may be provided as a conveyor. For example, the conveyor may include a roller conveyor, a belt conveyor, and a chain conveyor.

[0052] The chute (20) may include an upper inlet (21) for receiving raw material (b) from a raw material supply device (30), a lower outlet (23) for supplying raw material to a raw material inlet (6), and a connecting portion (22) for connecting and communicating between the inlet (21) and the outlet (23). The connecting portion (22) may be formed to be inclined so that raw material (b) supplied to the upper inlet (21) can be smoothly supplied to the lower outlet (23).

[0053] The chute (20) can be installed so as to be in communication with the raw material inlet (6) only when raw materials are being added. Accordingly, the transfer of heat inside the furnace body (2) to the chute (20) can be suppressed during normal times.

[0054] The chute (20) is arranged to rotate with respect to the inlet (21), and the raw material input device (10) may include a rotation unit (40) that rotates the chute (20). For example, the rotation unit (40) may be composed of a motor. The motor may have a rotation axis coupled to the center of the inlet to rotate the chute (20) with respect to the inlet (21).

[0055] When inputting raw materials, the rotation unit (40) can rotate the chute (20) so that the outlet (23) is positioned above the raw material input port (6), thereby connecting the chute (20) and the raw material input port (6). When inputting raw materials is finished, the rotation unit (40) can rotate the chute (20) so that the outlet (23) is not positioned above the raw material input port (6), thereby blocking the communication between the chute (20) and the raw material input port (6).

[0056] The state in which the communication between the chute (20) and the raw material inlet (6) is blocked can be maintained until the raw material (b) is again fed into the furnace body (6). Therefore, the heat from the furnace body (2) can be suppressed from being transferred to the chute (20) under normal circumstances.

[0057] Meanwhile, when the chute (20) is connected to the raw material inlet (6), the heat inside the furnace body (2) can rise through the raw material inlet (6) and be discharged upward along the chute (20).

[0058] In addition, the auxiliary material (b) may contain a component that is easily ignited, such as a lump of coal. When such auxiliary material (b) is injected into the furnace body (2), a flame may occur instantly inside the furnace body (2), thereby increasing the amount of heat generated.

[0059] Heat or flames discharged from the upper part of the chute (20) may deteriorate the durability of the raw material input device (10), such as by causing the raw material supply device (30) installed on the upper part of the chute (20) to be deformed or damaged.

[0060] In particular, in the structure of the electric furnace (1) in which the waste gas inside the furnace body (2) is discharged to the side of the furnace body (2), as in the present embodiment, it may be difficult to remove the heat near the raw material inlet (6) by the dust collector (4).

[0061] That is, unlike the electric furnace according to the present embodiment, in the case of an electric furnace of the type in which a dust collector is connected to the roof of the furnace body, the discharge location of the raw material inlet and the waste gas discharged from the furnace body are adjacent. Therefore, in this case, the heat near the raw material inlet is discharged together during the process of discharging the waste gas, thereby partially reducing the heat discharged upward through the raw material inlet.

[0062] On the other hand, in the case where the scrap supply path (3a) and the dust collector (4) are connected from the side of the furnace body (2), as in the electric furnace (1) according to the present embodiment, the exhaust gas discharge location is much lower than the raw material inlet (6) located in the loop (2a), so it may be difficult to collect the heat near the raw material inlet (6) together with the waste gas. As a result, in this case, it becomes difficult to reduce the heat near the raw material inlet (6) using the dust collector (4), so the durability of the raw material feeder (30) may be more likely to be reduced by the heat rising through the raw material inlet (6).

[0063] In order to improve the problem of reduced durability of the raw material feeder (30), the raw material feeder (10) may be provided with a configuration to suppress heat or flame inside the furnace body (2) from being transmitted to the raw material feeder (30) through the chute (20) when raw materials are fed.

[0064] Next, in the electric raw material input device (10) according to one embodiment of the present disclosure, the components that suppress heat or flame generated in the furnace body (2) from being transmitted to the raw material supply device (30) through the chute (20) will be described in detail.

[0065] The suit (20) may be provided with an outlet (23) that is ventilated in the vertical direction, and a connection portion (22) may be provided to communicate with the outlet (23) through the side of the outlet (23).

[0066] As illustrated in FIG. 2, this chute (20) can disperse the heat rising through the chute (20) to the outlet (23) and the connection (22). Accordingly, a portion of the heat flowing into the chute (20) through the raw material inlet (6) is discharged to the upper portion of the outlet (23), while the heat discharged to the upper portion of the connection (22) and the inlet (21) can be reduced. In addition, the heat discharged through the outlet (23) may not have an effect on damaging the raw material supply (30) because the distance from the raw material supply (30) is far.

[0067] The inlet (21), the connection (22), and the outlet (23) may each be provided in the form of a circular tube having a hollow interior. The connection (22) may be coupled to the side surface between the upper and lower ends of the outlet (23) so that the lower end communicates with the interior of the outlet (23). The inlet (21) may be formed integrally with the connection (22), or may be manufactured separately from the connection (22) and then coupled to the connection (22). The inlet (21) may be provided in the form of an expanded upper end to facilitate the supply of the raw material (b) from the raw material supply device (30).

[0068] In Fig. 3, the structure of the lower part of the outlet (23) of the chute (20) and the upper part of the raw material input port (6) is shown in a state where the chute (20) and the raw material input port (6) are connected.

[0069] As illustrated in Fig. 3, the lower portion of the outlet portion (23) may have a smaller cross-sectional area than the upper portion of the raw material inlet (6). In a state where the chute (20) and the raw material inlet (6) are connected, the lower portion of the outlet portion (23) and the upper portion of the raw material inlet (6) are concentric, and the lower portion of the outlet portion (23) may be positioned inside the outer periphery of the upper portion of the raw material inlet (6). Therefore, the raw material (b) discharged from the chute (20) can be safely supplied into the raw material inlet (6) while preventing scattering outside the raw material inlet (6).

[0070] In order to stably supply the raw material (b) to the furnace body (2), it is necessary to make the cross-sectional area of ​​the upper part of the raw material inlet (6) large while making the cross-sectional area of ​​the lower part of the outlet (23) of the chute (20) small. However, if the cross-sectional area of ​​the lower part of the outlet (23) of the chute (20) is excessively small, the raw materials in the form of ore may clump together and clog the outlet (23). Therefore, it may be desirable to make the cross-sectional area of ​​the lower part of the outlet (23) of the chute (20) smaller than the cross-sectional area of ​​the upper part of the raw material inlet (6) within a range where the clogging of the chute (20) can be prevented.

[0071] For example, the ratio of the short side length (c) of the upper side of the raw material inlet (6) and the diameter length of the lower side of the outlet (23) of the chute (20) may be 1:0.6. If the diameter of the lower side of the outlet (23) becomes smaller than this range, the outlet (23) may be blocked by the raw material (b). In addition, if the diameter of the lower side of the outlet (23) becomes larger than this range, the difference in cross-sectional area between the lower side of the outlet (23) and the upper side of the raw material inlet (8) may decrease, causing the raw material (b) to fly out of the raw material inlet (6).

[0072] Fig. 4 shows a modified example of a raw material input device (10) of an electric furnace according to the present embodiment.

[0073] As shown in Fig. 4, in this modified example, the connecting portion (22) of the suit (20) may be provided with an injection port (51, 52) for injecting air downward into the inside of the connecting portion (22).

[0074] The nozzles (51, 52) may be configured to inject compressed air. An air supply source (54) may be connected to the nozzles (51, 52) via an air line (53). An air compressor or an air tank storing compressed air may be used as the air supply source (54).

[0075] The nozzles (51, 52) can spray air downward into the inside of the connecting portion (22) to prevent heat or flames inside the body (2) from rising along the chute (20).

[0076] In addition, dust generated from the raw material (b) may adhere to the inner surface of the chute (20). The dust may fall from the raw material supply device (30) into the chute (20) when the raw material is supplied, or may fall off from the raw material (b) when the raw material flowing into the chute (20) collides with the inner surface of the chute (20). The dust adhered to the inner surface of the chute (20) may be easily ignited by heat or flame flowing into the chute (20), thereby increasing the amount of heat or flame emitted from the upper surface of the chute (20).

[0077] The nozzles (51, 52) spray air to remove dust inside the suit (20), thereby preventing the raw material supply device (30) from being damaged by heat caused by ignition of the dust.

[0078] When air is injected into the inlet (21) of the chute (20), the raw material (6) supplied to the chute (20) or the dust of the raw material (6) can easily fly out of the chute (20) by the air injected into the inlet (21). In addition, when air is injected into the outlet (23) of the chute (20), the raw material (6) supplied to the raw material inlet (6) or the dust of the raw material (6) can fly out of the raw material inlet (6) by the air injected into the outlet (23). Therefore, it may be desirable to install the injection ports (51, 52) in the connection portion (22) to prevent the raw material (6) or its dust from flying out.

[0079] The nozzles (51, 52) may include a first nozzle (51) arranged in the upper region (22a) of the connecting portion (22). The first nozzle (51) may inject air into the upper region (22a) of the connecting portion (22) adjacent to the raw material supply device (30), thereby effectively removing dust attached to the inner surface of the upper region (22a). Accordingly, the formation of heat due to ignition of dust can be suppressed in the chute (20) located close to the raw material supply device (30).

[0080] A plurality of first nozzles (51) may be arranged along the periphery of the upper region (22a). A plurality of first nozzles (51) may be arranged along the periphery of the upper region (22a) to evenly spray air for dust removal onto the entire inner surface of the upper region (22a).

[0081] As illustrated in Fig. 5, the first nozzle (51) may be configured to spray air diagonally toward the inner surface of the upper region (22a). Accordingly, the air sprayed through the first nozzle (51) may rotate downward along the inner surface of the upper region (22a), thereby increasing the removal efficiency of dust attached to the upper region (22a). The dotted arrow in Fig. 5 indicates the spray path of the air sprayed through the first nozzle (51).

[0082] The nozzles (51, 52) may further include a second nozzle (52) positioned between the upper region (22a) and the lower region (22b) of the connecting portion (22). In the connecting portion (22), an intermediate region (22c) may be formed between the upper region (22a) and the lower region (22b).

[0083] The second nozzle (52) can cooperate with the first nozzle (51) to increase the injection force of air injected into the chute (20). Accordingly, the auxiliary material injection device (10) can further improve the air action that suppresses flames or heat from the furnace (2) from flowing into the chute (20).

[0084] The second nozzle (52) can be arranged along the periphery of the connection (22) between the upper region (22a) and the lower region (22b) so that the air injected through the second nozzle (52) can be evenly injected onto the inner surface between the upper region (22a) and the lower region (22b).

[0085] FIGS. 6 and 7 illustrate another modified example of the raw material input device (10) according to the present embodiment.

[0086] As shown in FIGS. 6 and 7, in this modified example, a communication part (60) that connects the inside and the outside of the outlet part (23) is provided on the side of the outlet part (23), and the communication part (60) can be positioned below the position where the connection part (22) is connected.

[0087] The flue gas (60) discharges some of the heat that flows in through the lower portion of the outlet portion (23) and rises to the outside of the outlet portion (23) before it flows into the connecting portion (22), thereby reducing the heat discharged toward the raw material supply device (30) through the connecting portion (22) and the inlet portion (21) of the chute (20). In FIGS. 6 and 7, arrows indicate the discharge path of the heat discharged through the outlet portion (23) and the flue gas (60).

[0088] As shown in FIGS. 6 and 7, the communication portion (60) may include at least one of a through hole (61) penetrating the side of the outlet portion (23) and an extension pipe (62) extending from the side of the outlet portion (23).

[0089] In order to increase the amount of heat discharged through the flue pipe (60), a plurality of flue pipes (60) can be arranged along the perimeter of the outlet (23).

[0090] FIG. 8 illustrates another modified example of the raw material input device (10) according to the present embodiment.

[0091] As illustrated in FIG. 8, in this modified example, the connecting portion (22) is connected to the outlet portion (23) through the side surface of the central portion (23b) between the upper portion (23a) and the lower portion (23c) of the outlet portion (23), and the outlet portion (23) can form a venturi tube in which the central portion (23b) has an inner diameter smaller than that of the upper portion (23a) and the lower portion (23c).

[0092] Accordingly, as the speed of the heat passing through the outlet (23) increases, the pressure inside the outlet (23) decreases, and a greater amount of heat flows into the outlet (23) with the reduced pressure and can be discharged to the upper portion of the outlet (23). Accordingly, as the amount of heat discharged passing through the outlet (23) increases, the amount of heat discharged passing through the connection (22) can be relatively reduced.

[0093] Also, at this time, the air injected into the connection part (22) is sucked into the central part (23b) of the outlet part (23) where the pressure is lowered, so the air injection action of the nozzles (51, 52) that suppress the inflow of heat into the connection part (22) can become more active.

[0094] As described above, the disclosed embodiments and their modifications have been described with reference to the attached drawings. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments or modifications without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. A chute that supplies raw materials to the raw material inlet provided on the roof of the electric furnace body from the upper part of the raw material inlet; and including a raw material supply device that supplies raw materials from the upper part of the chute to the chute; The above suit is, An upper inlet section for receiving raw materials from the above raw material supplier; A lower outlet for supplying raw materials to the above raw material inlet; and Including a connecting part that connects and communicates between the inlet and outlet; The above outlet is provided to allow ventilation in the vertical direction, The above connecting portion is connected to the outlet portion through the side of the outlet portion, The above connecting part is provided with an injection port that injects air downward into the inside of the above connecting part, The above nozzle is an electric furnace raw material input device including a first nozzle arranged in the upper region of the connecting part.

2. In paragraph 1, The above first nozzle is an electric furnace raw material injection device in which a plurality of nozzles are arranged along the perimeter of the upper region.

3. In paragraph 1, The above first nozzle is an electric furnace raw material injection device that injects air diagonally toward the inner surface of the upper region.

4. In paragraph 1, An electric furnace raw material input device, wherein the nozzle further includes a second nozzle positioned between the upper and lower regions of the connecting portion.

5. A chute that supplies raw materials to the raw material inlet provided on the roof of the electric furnace body from the upper part of the raw material inlet; and including a raw material supply device that supplies raw materials from the upper part of the chute to the chute; The above suit is, An upper inlet section for receiving raw materials from the above raw material supplier; A lower outlet for supplying raw materials to the above raw material inlet; and Including a connecting part that connects and communicates between the inlet and outlet; The above outlet is provided to allow ventilation in the vertical direction, The above connecting portion is connected to the outlet portion through the side of the outlet portion, On the side of the above outlet, a connecting portion is provided to connect the inside and outside of the outlet, The above-mentioned connecting part is an electric furnace raw material input device arranged below the position where the above-mentioned connecting part is connected.

6. In paragraph 5, The above-mentioned connecting portion is an electric furnace raw material input device including a through hole penetrating the side of the outlet portion.

7. In paragraph 5, The above-mentioned connecting portion is an electric furnace raw material input device including an extension pipe formed to extend from the side of the outlet portion.

8. A chute for supplying raw materials to the raw material inlet provided on the roof of the electric furnace body from the upper part of the raw material inlet; and including a raw material supply device that supplies raw materials from the upper part of the chute to the chute; The above suit is, An upper inlet section for receiving raw materials from the above raw material supplier; A lower outlet for supplying raw materials to the above raw material inlet; and Including a connecting part that connects and communicates between the inlet and outlet; The above outlet is provided to allow ventilation in the vertical direction, The above connecting portion is communicated with the outlet portion through the central side between the upper and lower portions of the outlet portion, The above outlet portion is a raw material input device of an electric furnace forming a venturi tube having a central portion having an inner diameter smaller than that of the upper and lower portions.

9. A furnace body having a raw material inlet provided in the loop where the electrode is installed; A scrap supply device having a scrap supply path connected to the side of the above body to supply scrap to the above body; A dust collector that collects waste gas generated from the above body so that it passes through the scrap supply path; and Including a raw material injection device for injecting raw materials into the above body; The above raw material input device is, A chute for supplying raw materials from the upper portion of the raw material inlet to the raw material inlet; and including a raw material supply device that supplies raw materials from the upper part of the chute to the chute; The above suit is, An upper inlet section for receiving raw materials from the above raw material supplier; A lower outlet for supplying raw materials to the above raw material inlet; and Including a connecting part that connects and communicates between the inlet and outlet; The above connecting portion is connected to the outlet portion through the side of the outlet portion, The above outlet is an electric furnace that is provided to allow ventilation in the vertical direction.

10. In paragraph 9, The above connecting part is provided with an injection port that injects air downward into the inside of the above connecting part, The above nozzle is an electric furnace including a first nozzle arranged in the upper region of the connecting portion.

11. In paragraph 10, The above first nozzle is an electric furnace that injects air diagonally toward the inner surface of the upper region.

12. In paragraph 9, On the side of the above outlet, a connecting portion is provided to connect the inside and outside of the outlet, The above-mentioned connecting part is an electric furnace arranged below the position where the above-mentioned connecting part is connected.

13. In paragraph 12, The above-mentioned communication portion is an electric furnace including at least one of a through hole penetrating the side surface of the outlet portion and an extension pipe extending from the side surface of the outlet portion.

14. In paragraph 9, The above connecting portion is connected to the central side between the upper and lower portions of the outlet portion, The above outlet portion is an electric furnace forming a venturi tube having a central portion having an inner diameter smaller than the upper and lower portions.

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