Electric furnace

Abstract

An electric furnace according to an embodiment of the present disclosure comprises: a furnace body; a roof, comprising electrode holes each of which an electrode rod penetrates, for opening and closing the top of the furnace body; sleeves disposed on the roof, each comprising a hollow space corresponding to an electrode hole, and the inner circumferential surface, forming the hollow space, facing the outer circumferential surface of an electrode rod; and a plurality of nozzles, attached to the sleeves, provided to spray inert gas toward the electrode rods, the spray opening of the plurality of nozzles being sloped upward to spray the inert gas upward.

Description

electric furnace

[0001] The present disclosure relates to fixing an electrode rod of an electric furnace to an electric furnace loop.

[0002] Generally, an electric furnace is a facility that converts electrical energy into thermal energy to melt scrap; it supplies current to electrode rods to generate an arc between them and the raw materials, and uses the arc heat to melt raw materials such as scrap and ferroalloys to produce molten steel.

[0003] The electrode rod and the material must be maintained at a certain distance apart so that an arc is generated and the electrode rod is lowered as the material melts.

[0004] At this time, a certain gap is created between the electrode hole of the electric furnace loop where the electrode is fixed and the electrode to facilitate the smooth descent of the electrode rod; however, outside air may enter the furnace body through this gap, causing the surface of the electrode rod to oxidize.

[0005] Therefore, the development of a new technology is required to prevent external air from entering between the electrode rod and the electrode hole in order to minimize oxidation of the electrode rod surface.

[0006] One aspect of the present disclosure aims to provide an electric furnace that can easily seal the gap between an electrode rod and an electrode hole.

[0007] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0008] According to an embodiment of the present disclosure, the electric furnace comprises a furnace body, a loop including an electrode hole through which an electrode rod passes and which opens and closes the upper part of the furnace body, a sleeve disposed on the upper side of the loop and having a hollow corresponding to the electrode hole, wherein the inner surface forming the hollow is arranged to face the outer surface of the electrode rod, and a plurality of nozzles coupled to the sleeve and arranged to spray inert gas toward the electrode rod, wherein the nozzle openings of each of the plurality of nozzles are arranged to be inclined upward so that inert gas is sprayed upward.

[0009] The plurality of nozzles are spaced apart along the circumferential direction of the sleeve, and

[0010] The injection direction of each of the multiple nozzles is arranged in the sleeve such that it is tilted in one direction along the circumferential direction of the sleeve.

[0011] The plurality of nozzles spray inert gas so that the inert gas sprayed by the plurality of nozzles flows in the circumferential direction of the sleeve in the space between the electrode hole and the inner surface of the sleeve.

[0012] The inner surface of the above sleeve is made of a material having fire resistance of 1500 degrees or more.

[0013] The plurality of nozzles are arranged to be embedded in the sleeve, and the nozzle openings of the plurality of nozzles are each positioned to protrude from the inner surface of the sleeve.

[0014] According to an embodiment of the present disclosure, by injecting an inert gas into the space between the electric furnace and the inner surface of the sleeve, the inflow of outside air through the gap between the electrode rod and the electrode hole can be prevented, thereby minimizing oxidation of the electrode rod surface and improving the reliability of the electric furnace operation.

[0015] FIG. 1 is a drawing showing a planar view of a portion of an electric furnace according to one embodiment of the present disclosure.

[0016] FIG. 2 is a cross-sectional view of a portion of an electrode according to one embodiment of the present disclosure.

[0017] FIG. 3 is a cross-sectional perspective view of a sleeve of an electric furnace according to one embodiment of the present disclosure.

[0018] FIG. 4 is a simplified diagram illustrating the arrangement of a plurality of nozzles in an electric furnace according to one embodiment of the present disclosure.

[0019] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are presented to sufficiently convey the concept of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments presented herein and may be embodied in other forms. In order to clarify the present invention, the drawings may omit the illustration of parts unrelated to the description and may slightly exaggerate the size of components to aid understanding.

[0020] FIG. 2 is a drawing showing a molten reduction type with a fine raw material input structure applied according to one embodiment of the present invention, FIG. 1 is a drawing showing a truss panel equipped with a camber adjustment device according to one embodiment of the present invention, FIG. 2 is a drawing showing the state of connecting truss panels equipped with a camber adjustment device according to one embodiment of the present invention, and FIG. 3 is a drawing showing a prefabricated truss bridge with camber applied by a camber adjustment device according to one embodiment of the present invention.

[0021] Referring to FIGS. 1 to 3, a camber adjustment device for a prefabricated truss bridge (1) according to one aspect of the present invention may include a connecting member (100) whose length is adjustable by means of a length adjustment means. This connecting member (100) is adjustable in length and performs the function of connecting an upper chord (11) and a lower chord (12) to adjacent upper chords (11) and lower chords (12). Specifically, the connecting member (100) is a single unit of both upper chords (11) and lower chords (12) of a truss panel (10). Since the embodiments described in this specification are merely the most preferred embodiments of the present invention and do not represent all technical concepts of the present invention, it should be understood that various equivalents or modifications that can replace them at the time of filing this application are also included within the scope of the rights of the present invention.

[0022] Additionally, the same reference numerals or symbols presented in each drawing of the present disclosure represent parts or components that perform substantially the same function.

[0023] Furthermore, the terms used in this disclosure are for describing embodiments and are not intended to limit or restrict the disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the disclosure, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0024] Additionally, terms including ordinal numbers, such as “first,” “second,” etc., used in this disclosure may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of this disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term “and / or” includes a combination of a plurality of related described items or any of a plurality of related described items.

[0025] Furthermore, in this disclosure, the meaning of "identical" includes items that are similar in attributes or similar within a certain range. Additionally, "identical" means "substantially identical." The meaning of "substantially identical" should be understood as including within the scope of "identical" numerical values ​​that fall within the margin of error in manufacturing or differences that do not hold significance relative to a reference value.

[0026] In addition, terms such as "~part," "~unit," "~block," "~part," and "~module" may refer to a unit that processes at least one function or operation. For example, the above terms may refer to at least one piece of hardware such as an FPGA (field-programmable gate array) or ASIC (application specific integrated circuit), at least one piece of software stored in memory, or at least one process processed by a processor.

[0027] Singular expressions include plural expressions unless there is an obvious exception in the context.

[0028] Meanwhile, terms such as “front,” “rear,” “left,” and “right” used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0029] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the attached drawings.

[0030] FIG. 1 is a plan view of a portion of an electric furnace according to one embodiment of the present disclosure, FIG. 2 is a cross-sectional view of a portion of an electrode furnace according to one embodiment of the present disclosure, FIG. 3 is a cross-sectional perspective view of a sleeve of an electric furnace according to one embodiment of the present disclosure, and FIG. 4 is a simplified view of a plurality of nozzles arranged in an electric furnace according to one embodiment of the present disclosure.

[0031] Referring to FIGS. 1 to 4, the electric furnace includes a furnace body (10) in the shape of a container with an open top that can accommodate a certain amount of raw material, and a roof (20) that covers the open top of the furnace body (10).

[0032] The electric furnace is typically provided in the shape of a rod and includes an electrode rod (30) made of artificial graphite. By supplying current to the electrode rod (30), an arc is generated between the raw material and the electric furnace, and the raw material, such as scrap and ferroalloy, is melted by the arc heat to produce molten steel.

[0033] The electrode rod (30) can be inserted into the interior of the furnace body (10) through the electrode hole (21) provided in the loop (20).

[0034] The electrode rod (30) and the raw material inside the furnace body (10) must be maintained at a constant distance apart so that an arc can be generated to melt the raw material. The electric furnace may be configured to lower the electrode rod (30) to maintain a constant distance between the electrode rod (30) and the raw material during operation, so as the raw material melts, to prevent the gap between the electrode rod (30) and the raw material from widening.

[0035] Accordingly, a predetermined separation distance may be created between the electrode rod (30) and the electrode hole (21) so that the electrode rod (30) can be lowered easily.

[0036] The inside of the furnace body (10) can be maintained at a negative pressure so that fumes and dust that may be generated during operation of the electric furnace do not leak out of the furnace body (10), and accordingly, the leakage of fumes and dust out of the furnace body (10) can be minimized due to the separation between the electrode rod (30) and the electrode hole (21).

[0037] On the other hand, external air from the furnace body (10) may flow in through the gap between the electrode rod (30) and the electrode hole (21), and the surface of the electrode rod (30) may oxidize due to the external air, causing the diameter of the electrode rod (30) to shrink, and consequently, a problem may arise in which the efficiency of the electric furnace operation is reduced.

[0038] To prevent this, an electric furnace according to one embodiment of the present invention may include a sleeve (40) positioned above the loop (20) and a nozzle (50) that sprays inert gas into the space between the inner surface (42) of the sleeve (40) and the electrode rod (30) to prevent outside air from entering through the space between the inner surface (42) of the sleeve (40) and the electrode rod (30).

[0039] The sleeve (40) includes a hollow (41) corresponding to the electrode hole (21), and the inner surface (42) forming the hollow (41) may be arranged to face the outer surface of the electrode rod (30).

[0040] The sleeve (40) may include an outer shell (43) that forms the exterior of the sleeve (40).

[0041] The sleeve (40) may include a main body (44) made of a fire-resistant material on the inner side of the outer shell (43).

[0042] For example, the outer shell (43) may be provided to be combined with the loop (20). However, it is not limited to this, and the main body (44) itself may be provided to be combined with the loop (20).

[0043] The main body (44) can be made of a material that is fire-resistant to temperatures of approximately 1500 degrees or higher.

[0044] The inner surface (42) of the sleeve (40) may also be provided as the inner surface of the main body (44) and may be made of the same material as the main body (44). However, it is not limited thereto, and the inner surface (42) of the sleeve (40) may be made of a material different from the main body (44), and may be made of a material with higher fire resistance than the main body (44).

[0045] A nozzle (50) may be placed in the sleeve (40). The nozzle (50) may be provided to spray inert gas toward the electrode rod (30) on the inner surface (42) of the sleeve (40).

[0046] As the inert gas sprayed toward the electrode rod (30) is distributed in the space between the inner surface (42) of the sleeve (40) and the electrode rod (30), external air can be prevented from flowing into the gap between the electrode hole (21) and the electrode rod (30).

[0047] The nozzle (50) can be arranged so that the nozzle opening is positioned so that it slopes upward from the sleeve (40) toward the electrode rod (30).

[0048] This is to maximize the period during which the inert gas sprayed from the nozzle (50) can remain in the space between the sleeve (40) and the electrode rod (30).

[0049] This is because when the nozzle (50) sprays inert gas downward, the inert gas can escape from the space between the sleeve (40) and the electrode rod (30) and flow into the gap between the electrode hole (21) and the electrode rod (30), and accordingly, after the outside air flows into the space between the sleeve (40) and the electrode rod (30), it can flow into the gap between the electrode hole (21) and the electrode rod (30) along with the inert gas.

[0050] The nozzle (50) can be provided in multiple numbers.

[0051] A plurality of nozzles (50) can be spaced apart from each other in the circumferential direction of the sleeve (40) and arranged radially on the sleeve (40) with the electrode rod (30) as the center.

[0052] Multiple nozzles (50) can be embedded in the main body (44). As multiple nozzles (50) are embedded inside the main body (44), fire resistance is improved, and the reliability of the electric furnace can be increased.

[0053] In the case of the buried plurality of nozzles (50), the nozzle openings of the plurality of nozzles (50) can each be provided to be exposed on the inner surface (42) of the sleeve (40).

[0054] A plurality of nozzles (50) may be spaced apart along the circumferential direction of the sleeve (40), and the injection direction of each of the plurality of nozzles (40) may be arranged in the sleeve (40) such that it is tilted in one direction along the circumferential direction of the sleeve (40).

[0055] That is, the direction in which each of the nozzles (50) are directed can be sequentially tilted at a certain angle. Here, the direction in which each nozzle is tilted can be set to the same direction.

[0056] Accordingly, as a plurality of nozzles (50) are arranged to tilt sequentially toward each other at a certain angle and in a certain direction, inert gas is injected into all the space between the sleeve (40) and the electrode rod (30), thereby further improving the sealing power of the outside air.

[0057] In addition, the multiple nozzles (50) spray inert gas so that the inert gas sprayed from the multiple nozzles (50) can rotate in one direction in the space between the sleeve (40) and the electrode rod (30), thereby maximizing the period during which the inert gas can remain in the space between the sleeve (40) and the electrode rod (30).

[0058] Although the technical concept of the present invention has been explained above through specific embodiments, the scope of the present invention is not limited to these embodiments. Various embodiments that can be modified or varied by those skilled in the art within the scope that does not deviate from the gist of the technical concept of the present invention as specified in the claims shall also be considered to fall within the scope of the present invention.

Claims

1. Old body; A loop that opens and closes the upper part of the above waste and includes an electrode hole through which an electrode rod passes; A sleeve disposed on the upper side of the loop, including a hollow corresponding to the electrode hole, wherein the inner surface forming the hollow is arranged to face the outer surface of the electrode rod; It includes a plurality of nozzles coupled to the sleeve and arranged to spray inert gas toward the electrode rod. The above plurality of nozzles are each arranged such that the nozzle openings are inclined upward so that inert gas is injected upward.

2. In Paragraph 1, The plurality of nozzles are spaced apart along the circumferential direction of the sleeve, and An electric furnace disposed in the sleeve such that the injection direction of a plurality of nozzles is each tilted in one direction along the circumferential direction of the sleeve.

3. In Paragraph 2, The above plurality of nozzles is an electric furnace that injects inert gas such that the inert gas injected by the plurality of nozzles flows in the circumferential direction of the sleeve in the space between the electrode hole and the inner surface of the sleeve.

4. In Paragraph 1, An electric furnace in which the inner surface of the above sleeve is made of a material having fire resistance of 1500 degrees or more.

5. In Paragraph 4, An electric furnace in which the plurality of nozzles are provided to be embedded in the sleeve, and the nozzle openings of the plurality of nozzles are each arranged to protrude from the inner surface of the sleeve.

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