Burner and electric furnace including same

Abstract

A burner according to the present invention comprises: a first cylinder extending in a first direction; a second cylinder extending in the first direction and formed on the outside of the first cylinder so as to protrude further than the first cylinder in the first direction; a first gas supply unit for supplying a first gas to the inside of the first cylinder; a second gas supply unit for supplying a second gas to the outside of the first cylinder and the inside of the second cylinder; a cylinder extension portion coupled to the front of the first cylinder and protruding further than the second cylinder in the first direction; and a mixing portion coupled to the front of the second cylinder and having a through-hole defined therein. One end of the cylinder extension portion is disposed on the through-hole of the mixing portion.

Description

Burner and electric furnace containing same

[0001] The present invention relates to a burner and an electric furnace including the same.

[0002] In general, the steel material production process in the steel industry can be broadly divided into a blast furnace-converter production system that uses ore as the main raw material, and an electric furnace production system that uses scrap, which is recovered / recycled after producing steel materials and turning them into products, as the main raw material.

[0003] And recently, as carbon neutrality has become a global issue, the electric furnace process, which produces ≤10% of the CO2 emissions of the blast furnace process, is emerging as an alternative for future steel production.

[0004] Unlike a conventional electric furnace that receives liquid raw materials, injects oxygen, and oxidizes and refines them, the general electric furnace steelmaking process uses high-temperature arc heat generated from electrodes that apply high voltage and high current to solid raw materials (scrap). This process causes arc deflection due to mutual interference between electrodes, creating cold spots in the furnace.

[0005] LNG burners applied to these cold spots can be applied to the melting process of solid raw materials (scrap) to assist with electric energy and control the supply of uniform energy to the furnace as a whole.

[0006] This energy supplied by the burner promotes scrap melting by supplementing the electrical energy that is relatively less transmitted at the projection point, i.e., the cold spot, and can directly melt some of the scrap near the nozzle.

[0007] Meanwhile, burners can be damaged during the process due to backfire or infiltration by steelmaking slag. Conventionally, burner components were firmly secured using welding or other methods, so even if a portion of the burner was damaged, the entire burner had to be replaced.

[0008] Accordingly, there is a need to develop a burner that can premix oxygen and fuel inside while minimizing replacement costs in case of burner damage.

[0009] Meanwhile, in the case of burners, a swirling member such as a swirler is used to control the flow of fluid flowing inside.

[0010] Typically, a swirler has a structure that includes multiple rotating blades, and the rotating blades rotate due to the flow of fluid.

[0011] Since the aforementioned rotating blades are fixed to the rotation axis, there is a problem in that once the swirler is placed, it is difficult to replace it and it is difficult to further change the flow velocity through the placed swirler.

[0012] Accordingly, there is also a need to develop a burner in which the rotating parts, such as the swirler, can be easily replaced.

[0013] In order to solve the problems of the above-described prior art, the purpose is to provide a burner and an electric furnace including the same, in which parts are easy to replace and the cost of replacing parts when damaged is minimized.

[0014] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0015] A burner according to one embodiment of the present invention includes a first cylinder extending in a first direction, a second cylinder extending in the first direction and formed on the outside of the first cylinder and protruding from the first cylinder in the first direction, a first gas supply unit supplying a first gas to the inside of the first cylinder, a second gas supply unit supplying a second gas to the outside of the first cylinder and the inside of the second cylinder, a cylinder extension unit coupled to the front of the first cylinder and protruding from the second cylinder in the first direction, and a mixing unit coupled to the front of the second cylinder and having a through hole defined therein, wherein one end of the cylinder extension unit is disposed on the through hole of the mixing unit.

[0016] According to one embodiment of the present invention, a first flow path is defined by the inner surface of the first cylinder and the cylinder extension to provide a path through which the first gas can flow, and a second flow path is defined by the outer surface of the first cylinder, the inner surface of the second cylinder, the outer surface of the cylinder extension, and the inner surface of the mixing portion to provide a path through which the second gas can flow, and may further include a first turning member disposed on the first flow path and a second turning member disposed on the second flow path.

[0017] According to one embodiment of the present invention, the device may further include a first fastening member disposed between the first cylinder and the cylinder extension to couple the first cylinder and the cylinder extension.

[0018] According to one embodiment of the present invention, at least a portion of the first pivot member may be disposed inside the cylinder extension.

[0019] According to one embodiment of the present invention, the cylinder extension may further include a recessed portion that is recessed from the inner peripheral surface of the cylinder extension toward the outer peripheral surface and extends in the first direction.

[0020] According to one embodiment of the present invention, a second fastening member may be further included, which is disposed between the second cylinder and the mixing unit and connects the second cylinder and the mixing unit.

[0021] According to one embodiment of the present invention, at least a portion of the second pivot member may be disposed inside the mixing section.

[0022] According to one embodiment of the present invention, a third fastening member may be further included for connecting the first pivot member and the first cylinder or the cylinder extension.

[0023] According to one embodiment of the present invention, a fourth fastening member may be further included for connecting the second pivot member and the second cylinder or the mixing member.

[0024] According to one embodiment of the present invention, the first pivot member and the second pivot member may be arranged to overlap with respect to the first direction.

[0025] According to one embodiment of the present invention, the through hole may include a first portion whose cross-sectional size decreases as it goes in the first direction, and a second portion extending from the first portion and whose cross-sectional size increases as it goes in the first direction.

[0026] According to one embodiment of the present invention, one side of the cylinder extension may be disposed in the first portion, and one end of the cylinder extension may be disposed at a boundary between the first portion and the second portion.

[0027] According to one embodiment of the present invention, a fifth fastening member may be further included, which is arranged between the first gas supply member and the first cylinder and connects the first gas supply member and the first cylinder.

[0028] According to one embodiment of the present invention, a sixth fastening member may be further included, which is arranged between the second gas supply member and the second cylinder and connects the second gas supply member and the second cylinder.

[0029] According to one embodiment of the present invention, a flow stabilization member may be further included to be disposed on the second euro and stabilize the flow of the second gas.

[0030] An electric furnace according to one embodiment of the present invention includes a melting furnace and a burner coupled to the melting furnace, wherein the burner includes a first cylinder extending in a first direction, a second cylinder extending in the first direction and formed on the outside of the first cylinder and protruding from the first cylinder in the first direction, a first gas supply unit supplying a first gas to the inside of the first cylinder, a second gas supply unit supplying a second gas to the outside of the first cylinder and the inside of the second cylinder, a cylinder extension unit coupled to the front of the first cylinder and protruding from the second cylinder in the first direction, and a mixing unit coupled to the front of the second cylinder and having a through hole defined therein, wherein one end of the cylinder extension unit is disposed on the through hole of the mixing unit.

[0031] According to one embodiment of the present invention, the device may further include a first fastening member disposed between the first cylinder and the cylinder extension to couple the first cylinder and the cylinder extension.

[0032] According to one embodiment of the present invention, a second fastening member may be further included, which is disposed between the second cylinder and the mixing unit and connects the second cylinder and the mixing unit.

[0033] According to one embodiment of the present invention, the burner may further include a first flow path defined by an inner surface of the first cylinder and a cylinder extension to provide a path through which the first gas can flow, and a second flow path defined by an outer surface of the first cylinder, an inner surface of the second cylinder, an outer surface of the cylinder extension, and an inner surface of the mixing portion to provide a path through which the second gas can flow, and a first turning member disposed on the first flow path and a second turning member disposed on the second flow path.

[0034] According to one embodiment of the present invention, at least a portion of the first pivot member may be disposed inside the cylinder extension.

[0035] According to one embodiment of the present invention, at least a portion of the second pivot member may be disposed inside the mixing section.

[0036] According to one embodiment of the present invention, the through hole may include a first portion whose cross-sectional size decreases as it goes in the first direction, and a second portion extending from the first portion and whose cross-sectional size increases as it goes in the first direction.

[0037] According to one embodiment of the present invention, a burner and an electric furnace including the same can be provided, in which parts can be easily replaced and replacement costs can be minimized when parts are damaged.

[0038] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0039] FIG. 1 is a drawing showing a cross-section of an electric furnace according to one embodiment of the present invention.

[0040] FIG. 2 is a perspective view showing an assembled burner according to one embodiment of the present invention.

[0041] Figure 3 is an exploded perspective view of a burner according to one embodiment of the present invention.

[0042] Figure 4 is a cross-sectional view taken along line AA′ in Figure 2.

[0043] Figure 5 is an exploded perspective view of a cylinder extension and a first pivot member according to one embodiment of the present invention.

[0044] Figure 6 is an exploded perspective view of a burner according to one embodiment of the present invention.

[0045] Figure 7 is an exploded perspective view of a burner according to one embodiment of the present invention.

[0046] Figure 8 is a cross-sectional view of a burner according to one embodiment of the present invention.

[0047] In this specification, when it is said that a component (or region, layer, portion, etc.) is “on,” “connected to,” or “coupled to” another component, it means that it can be directly disposed / connected / coupled to the other component, or a third component may be disposed between them.

[0048] Identical drawing numbers indicate identical components. Furthermore, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the purpose of effectively illustrating the technical content.

[0049] “And / or” includes any combination of one or more of the associated constructs that can be defined.

[0050] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a "second component," and similarly, a second component may also be referred to as a "first component." Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0051] Additionally, terms such as "below," "lower," "above," and "upper" are used to describe the relationships between components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. Furthermore, terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the relevant technical context, and unless interpreted in an idealized or overly formal sense, they are explicitly defined herein.

[0053] Terms such as "include" or "have" should be understood to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0054] Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings.

[0055] FIG. 1 is a drawing showing a cross-section of an electric furnace according to one embodiment of the present invention.

[0056] Referring to Fig. 1, an electric furnace (1000) can accommodate a raw material (M) therein and heat and melt the raw material (M) using electric energy. The raw material (M) can be composed of at least one selected from the group consisting of metals, alloys, direct reduced iron (DRI), ore-based materials (OBM's), and low-grain scrap.

[0057] The electric furnace (1000) may include a melting furnace (100), an AC electrode member (200), and a burner (300).

[0058] The melting furnace (100) may include a receiving member (110) and a cover member (120). The receiving member (110) receives a raw material (M), and the received raw material (M) may be heated within the receiving member (110).

[0059] The receiving member (110) may be formed of a heat-resistant, fire-resistant metal material so as not to be damaged even in a high-temperature environment. The receiving member (110) may be provided with an opening (111) that allows the raw material (M) to be loaded into the receiving member (110).

[0060] Figure 1 illustrates a case where a raw material (M) is accommodated within a receiving member (110). The raw material (M) can be accommodated within the receiving member (110). When the raw material (M) is melted, molten steel can be produced, and slag can be formed on top of the molten steel.

[0061] The cover member (120) opens and closes the opening (111). The cover member (120) is positioned on the upper side of the receiving member (110) and may be provided in a shape that covers the opening (111).

[0062] The cover member (120) may be formed of a heat-resistant, fire-resistant metal material so as not to be damaged even in a high-temperature environment. The cover member (120) may be formed of the same material as the receiving member (110), but is not limited thereto.

[0063] The AC electrode member (200) may be placed on the upper part of the electric furnace (1000). The AC electrode member (200) may be provided on the cover member (120). One side of the AC electrode member (200) may be placed on the outside of the melting furnace (100), and the other side may be placed on the inside of the melting furnace (100).

[0064] The AC electrode member (200) can apply electrical energy to the raw material (M) loaded in the receiving member (110). Through the electrical energy applied by the AC electrode member (200), the raw material (M) in the receiving member (110) can be melted.

[0065] For example, but not limited thereto, the AC electrode member (200) can melt the charged raw material (M) by causing an arc to be generated between the AC electrode member (200) and the charged raw material (M).

[0066] The AC electrode member (200) may include a first AC electrode rod (210), a second AC electrode rod (220), and a third AC electrode rod (230). Through the first AC electrode rod (210), the second AC electrode rod (220), and the third AC electrode rod (230), a three-phase AC current may be applied to the AC electrode member (200).

[0067] Each of the first AC electrode rod (210), the second AC electrode rod (220), and the third AC electrode rod (230) can be connected to a power source (not shown) that supplies electric energy so that three-phase AC can be provided.

[0068] The burner (300) can assist in the melting of the raw material (M) by supplying a flame into the electric furnace by blowing in fuel and an oxidizer. In other words, the melting time of the raw material (M) can be shortened not only by the heat generated by the fixed AC electrode member (200) but also by the flame supplied by the burner (300).

[0069] In addition, the raw material (M) located in an area where the heat generated by the AC electrode member (200) cannot reach can be preheated and melted by the burner (300), so that the overall melting time of the raw material (M) can be shortened.

[0070] For a more detailed description of the burner (300), reference is made to FIGS. 2 to 5.

[0071] Fig. 2 is a perspective view showing an assembled burner according to one embodiment of the present invention. Fig. 3 is an exploded perspective view of a burner according to one embodiment of the present invention. Fig. 4 is a cross-sectional view taken along line AA′ in Fig. 2. Fig. 5 is an exploded perspective view of a cylinder extension and a first turning member according to one embodiment of the present invention. In Fig. 5, for convenience of explanation, the remaining components except for the cylinder extension and the first turning member are omitted.

[0072] Referring further to FIGS. 2 to 5, the burner (300) may include a first cylinder (310), a second cylinder (320), a first gas supply unit (330), a second gas supply unit (340), a cylinder extension unit (350), a mixing unit (360), a first turning member (370), and a second turning member (380).

[0073] According to one embodiment of the present invention, the first cylinder (310) and the second cylinder (320) can extend in the first direction (DR1). The first cylinder (310) and the second cylinder (320) have a hollow interior, so as to provide a path through which the first gas (1) and the second gas (2) flow.

[0074] Hereinafter, the first cylinder (310) and the second cylinder (320) are described as having a cylindrical shape with a hollow interior, but are not limited thereto, and any shape may be used as long as it can provide a path through which the first gas (1) and the second gas (2) flow.

[0075] The first gas (1) may include an oxidizer. For example, the first gas (1) may include oxygen (O2) gas, but is not limited thereto.

[0076] The second gas (2) may include fuel. For example, the second gas (2) may include at least one selected from natural gas (LNG, Liquefied natural gas), hydrogen gas (H2), coke oven gas (COG), and ammonia (NH3) gas, but is not limited thereto.

[0077] The first gas (1) and the second gas (2) can flow through separate paths. For this purpose, the first cylinder (310) can be placed inside the second cylinder (320). That is, the second cylinder (320) can be formed on the outside of the first cylinder (310). Hereinafter, the first cylinder (310) and the second cylinder (320) are described as having the same central axis (AX), but are not limited thereto.

[0078]

[0079] *By forming the second cylinder (320) on the outside of the first cylinder (310), the first gas (1) can flow inside the first cylinder (310), and the second gas (2) can flow between the outer surface of the first cylinder (310) and the inner surface of the second cylinder (320).

[0080] When the first gas (1) and the second gas (2) flow through separate paths, it is possible to suppress or prevent the first gas (1) and the second gas (2) from being mixed and combusted first inside the first cylinder (310) or the second cylinder (320) rather than at the designed mixing point.

[0081] According to one embodiment of the present invention, the second cylinder (320) may protrude in the first direction (DR1) more than the first cylinder (310). By protruding the second cylinder (320) more than the first cylinder (310), the first turning member (370) and the second turning member (380) may be positioned to overlap each other. A detailed description thereof will be provided later.

[0082] According to one embodiment of the present invention, the first gas supply unit (330) may be connected at one end to the first cylinder (310). The first cylinder (310) may receive the first gas (1) through the first gas supply unit (330). The received first gas (1) may flow within the first cylinder (310) along the first direction (DR1).

[0083] The first gas supply unit (330) may be positioned at the rear of the first cylinder (310) based on the first direction (DR1). For example, the first gas supply unit (330) may be positioned at the rear end of the first cylinder (310) and coupled with the first cylinder (310). However, this is not limited thereto, and any unit capable of supplying the first gas (1) into the interior of the first cylinder (310) may be used.

[0084] When the first gas supply unit (330) is positioned at the rear end of the first cylinder (310), the first gas (1) can flow more smoothly in the first direction (DR1) in the first cylinder (310).

[0085] According to one embodiment of the present invention, the second gas supply unit (340) may be connected at one end to the second cylinder (320). The second cylinder (320) may receive the second gas (2) through the second gas supply unit (340). The received second gas (2) may flow within the second cylinder (320) along the first direction (DR1).

[0086] The second gas supply unit (340) may be positioned at the rear of the second cylinder (320) with respect to the first direction (DR1). For example, the second cylinder (320) may have a through hole (HTH) defined in a side wall positioned at the rear with respect to the first direction (DR1), so that the second cylinder (320) may be supplied with the second gas (2) from the second gas supply unit (340) through the through hole (HTH).

[0087] When the second gas supply unit (340) is connected to the second cylinder (320) through a side wall penetration hole (HTH), the arrangement of the first gas supply unit (330) and the second gas supply unit (340) can be made easier.

[0088] According to one embodiment of the present invention, a plurality of through holes (HTH) may be formed. In other words, the second cylinder (320) may be supplied with the second gas (2) through a plurality of second gas supply units (340).

[0089] By supplying the second gas (2) to the second cylinder (320) through a plurality of second gas supply units (340), it is possible to suppress or prevent the second gas (2) from being supplied biasedly to one side of the second cylinder (320).

[0090] Furthermore, when an additional component such as an electric furnace cooling device (not shown) is placed around the burner (300), the second gas (2) can be supplied more smoothly to the second cylinder (320) while being placed so as not to overlap with the additional component.

[0091] However, it is not limited to this, and any structure that can supply the second gas (2) to the inside of the second cylinder (320) may be used.

[0092] According to one embodiment of the present invention, the cylinder extension (350) can be arranged in front of the first cylinder (310), i.e., in the first direction (DR1), and coupled with the first cylinder (310).

[0093] The cylinder extension (350) can receive the first gas (1) from the first cylinder (310). The cylinder extension (350) can provide a path through which the first gas (1) is discharged to the mixing unit (360).

[0094] According to one embodiment of the present invention, the cylinder extension (350) can protrude in the first direction (DR1) more than the second cylinder (320).

[0095] Through this, the first gas (1) discharged from the cylinder extension (350) and the second gas (2) gathered in the direction of the central axis (AX) by the first part (362) of the mixing unit (360) can be smoothly mixed inside the mixing unit (360). A detailed description of this will be provided later.

[0096] According to one embodiment of the present invention, the first cylinder (310) and the cylinder extension (350) may constitute a first flow path (10). That is, the first flow path (10) may be defined by the inner circumferential surfaces of the first cylinder (310) and the cylinder extension (350). The first flow path (10) may provide a path through which the first gas (1) flows.

[0097] According to one embodiment of the present invention, the cylinder extension (350) may include a first fastening portion (351). The first fastening portion (351) may be positioned at an end of the cylinder extension (350) and may be coupled with the first cylinder (310).

[0098]

[0099] *That is, a first fastening part (351) is arranged between the first cylinder (310) and the cylinder extension part (350), so that the first cylinder (310) and the cylinder extension part (350) can be coupled through the first fastening part (351).

[0100] The first cylinder (310) and the cylinder extension (350) can be combined in a separable structure. That is, the first fastening portion (351) that combines the first cylinder (310) and the cylinder extension (350) can have a structure that is easy to combine and separate.

[0101] For example, the first fastening portion (351) may connect the first cylinder (310) and the cylinder extension (350) in a set screw manner. For example, the first fastening portion (351) may include a headless bolt to bolt-connect the first cylinder (310) and the cylinder extension (350).

[0102] When the first fastening part (351) connects the first cylinder (310) and the cylinder extension part (350) in a set screw manner, the first fastening part (351) can minimize the influence on the first gas (1) flowing inside the first flow path (10) and the second gas (2) flowing outside the first cylinder (310) and the cylinder extension part (350).

[0103] That is, by fastening the first cylinder (310) and the cylinder extension (350) by a headless bolt, the formation of uneven portions on the outer or inner surface of the first cylinder (310) and the cylinder extension (350) can be minimized, thereby suppressing or preventing fluctuations in the flow of the first gas (1) and the second gas (2).

[0104] According to one embodiment of the present invention, the mixing unit (360) may be coupled to the front of the second cylinder (320) with respect to the first direction (DR1) so that a through hole (H) may be defined.

[0105] The mixing unit (360) can receive the second gas (2) from the second cylinder (320) and provide a space in which the second gas (2) flows inside.

[0106] The mixing portion (360) may protrude in the first direction (DR1) more than the cylinder extension portion (350). That is, one end of the cylinder extension portion (350) may be placed on the through hole (H) of the mixing portion (360).

[0107] Through this, the mixing unit (360) can receive the first gas (1) from the cylinder extension unit (350) and provide a space where the first gas (1) and the second gas (2) are mixed.

[0108] A combustion flame can be formed inside the mixing unit (360) by the mixed first gas (1) and second gas (2). The formed combustion flame can be sprayed to the outside of the burner (300) through the through hole (H).

[0109] According to one embodiment of the present invention, the first cylinder (310), the second cylinder (320), the cylinder extension (350), and the mixing unit (360) can constitute a second flow path (20). That is, the second flow path (20) can be defined by the outer surface of the first cylinder (310), the inner surface of the second cylinder (320), the outer surface of the cylinder extension (350), and the inner surface of the mixing unit (360). The second flow path (20) can provide a path through which the second gas (2) flows.

[0110] According to one embodiment of the present invention, the mixing unit (360) may include a second fastening unit (361). The second fastening unit (361) may be positioned at an end of the mixing unit (360) and coupled with the second cylinder (320).

[0111] That is, a second fastening part (361) is placed between the second cylinder (320) and the mixing part (360), so that the second cylinder (320) and the mixing part (360) can be coupled through the second fastening part (361).

[0112] The second cylinder (320) and the mixing unit (360) can be combined in a separable structure. That is, the second fastening unit (361) that combines the second cylinder (320) and the mixing unit (360) can have a structure that is easy to combine and separate.

[0113] For example, the second fastening portion (361) can connect the second cylinder (320) and the mixing portion (360) in a flange manner. As shown in FIG. 3, the second cylinder (320) includes a flange portion (321), and the mixing portion (360) includes a second fastening portion (361) in a flange shape, so that the second cylinder (320) and the mixing portion (360) can be connected through the connection of the flange portion (321) and the second fastening portion (361).

[0114] When the second fastening part (361) connects the second cylinder (320) and the mixing part (360) in a flange manner, the influence of the second fastening part (361) on the flow of the second gas (2) flowing inside the second cylinder (320) and the mixing part (360) can be minimized.

[0115] However, it is not limited to this, and if the second cylinder (320) and the mixing unit (360) have a structure that can be combined and separated, the second fastening unit (361) may be of a different type.

[0116] According to one embodiment of the present invention, the mixing unit (360) may include a first portion (362) whose cross-section size decreases as it goes in the first direction (DR1) and a second portion (363) whose cross-section increases as it goes in the first direction (DR1). Here, the cross-section is based on a plane perpendicular to the first direction (DR1).

[0117] According to one embodiment of the present invention, the first portion (362) may be positioned in front of the second fastening portion (361) with respect to the first direction (DR1). That is, the first portion (362) may extend from the second fastening portion (361).

[0118] Accordingly, a portion of the kinetic energy of the second gas (2) supplied from the second cylinder (320) flowing in the first direction (DR1) by the first portion (362) having a decreasing inner diameter can be converted to the second direction (DR2) toward the central axis (AX).

[0119] In other words, the second gas (2) can be gathered toward the center of the mixing section (360) as it flows in the first direction (DR1) by the first part (362).

[0120] The first gas (1) discharged from the cylinder extension (350) and the second gas (2) flowing along the first part (362) are mixed at the central axis (AX) of the mixing section (360), so that a combustion flame can be formed.

[0121] The second part (363) may be positioned in front of the first part (362) with respect to the first direction (DR1). That is, the second part (363) may extend from the first part (362).

[0122] Accordingly, the combustion flame formed in the first part (362) can spread widely along the side wall of the second part (363), thereby increasing the width of the emitted combustion flame.

[0123] According to one embodiment of the present invention, one end of the cylinder extension (350) may be placed at the boundary between the first part (362) and the second part (363).

[0124] That is, the first gas (1) and the second gas (2) are gathered at the central axis (AX) of the mixing portion (360) through the first part (362), so that a combustion flame can be formed from the boundary surface between the first part (362) and the second part (363), and the width of the combustion flame formed through the second part (363) can increase.

[0125] According to one embodiment of the present invention, the first pivot member (370) may be disposed on the first flow path (10). Specifically, at least a portion of the first pivot member (370) may be disposed inside the cylinder extension (350). That is, the front of the first pivot member (370) may be located forward of the first fastening portion (351) based on the first direction (DR1).

[0126] When the first pivot member (370) is positioned forward of the first fastening member (351), it may be easier to separate the first pivot member (370) from the first filament (10) separated through the first fastening member (351).

[0127] The first pivot member (370) may include a third fastening member (371) as illustrated in FIG. 3. The third fastening member (371) may connect the first pivot member (370) to the first cylinder (310) or cylinder extension (350).

[0128] Accordingly, the first pivot member (370) can be fixedly placed inside the first euro (10).

[0129] The third fastening member (371) can be used to connect the cylinder extension member (350) and the first pivot member (370) in the same manner as the first fastening member (351) using a set screw. However, this is not limited thereto, and the first pivot member (370) can be fixed to the inside of the first flow path (10) through a fitting or a catch portion, etc.

[0130] According to one embodiment of the present invention, the cylinder extension (350) may include a recessed portion (352) that is recessed from the inner surface of the cylinder extension (350) toward the outer surface and extends in the first direction (DR1).

[0131] The depression (352) can provide a path for the first pivot member (370) to move in the first direction (DR1).

[0132] For example, the first pivot member (370) may include a guide portion (372) as shown in Fig. 5. The guide portion (372) may protrude from the outer surface of the first pivot member (370) and extend in the first direction (DR1), and may be arranged to face the recessed portion.

[0133] That is, by placing the guide portion (372) on the recessed portion (352), the first pivot member (370) can move smoothly in the first direction (DR1).

[0134] The first pivot member (370) may include a plurality of first pivot blades (373). The first pivot blades (373) may generate a pivotal flow in the first gas (1) through rotation.

[0135] As the first gas (1) passes through the first turning member (370), a turning force can be imparted. Accordingly, a turning flow can occur in the first gas (1).

[0136] The first gas (1) swirls and flows through the first swirl member (370), so that the first gas (1) and the second gas (2) can be mixed more smoothly. Accordingly, the combustion flame formed in the mixing unit (360) can be suppressed or prevented from being incompletely combusted.

[0137] According to one embodiment of the present invention, the second pivot member (380) may be positioned inside the second flow path (20). Specifically, at least a portion of the second pivot member (380) may be positioned inside the mixing unit (360). That is, the front of the second pivot member (380) may be positioned ahead of the second fastening unit (361) with respect to the first direction (DR1).

[0138] When the second pivot member (380) is positioned forward of the second fastening member (361), it may be easier to separate the second pivot member (380) from the second filament (20) separated through the second fastening member (361).

[0139] The second pivot member (380) may include a fourth fastening member (381) as illustrated in FIG. 3. The fourth fastening member (381) may connect the second pivot member (380) to the second cylinder (320) or the mixing member (360).

[0140] Accordingly, the second pivot member (380) can be fixedly placed inside the second euro (20).

[0141] The fourth fastening part (381) can connect the mixing part (360) and the second turning member (380) in the same way as the first fastening part (351) and the third fastening part (371) by using a set screw method.

[0142] However, it is not limited thereto, and the second pivot member (380) may be fixed inside the second euro (20) through a fitting or a catch portion, etc.

[0143] The second pivot member (380) may include a plurality of second pivot blades (382). The second pivot blades (382) may generate a pivotal flow in the second gas (2) through rotation.

[0144] As the second gas (2) passes through the second turning member (380), a turning force can be imparted. Accordingly, a turning flow can occur in the second gas (2).

[0145] The second gas (2) swirls and flows through the second swirl member (380), so that the first gas (1) and the second gas (2) can be mixed more smoothly. Accordingly, the combustion flame formed in the mixing unit (360) can be suppressed or prevented from being incompletely combusted.

[0146] As the cross-sectional size of the first portion (362) decreases, one end of the second pivot member (380) can be fixed to the boundary between the second fastening portion (361) and the first portion (362).

[0147] However, it is not limited thereto, and may include a recessed portion that is sunken from the inner surface of the mixing portion (360) toward the outer surface and extends in the first direction (DR1) and a guide portion that protrudes from the outer surface of the second turning member (380) and extends in the first direction (DR1).

[0148] According to one embodiment of the present invention, the burner (300) includes a first turning member (370) and a second turning member (380), so that not only is mixing of the first gas (1) and the second gas (2) performed smoothly, but also the first fastening member (351), the second fastening member (361), the third fastening member (371), and the fourth fastening member (381) can facilitate coupling and separation between burner (300) components.

[0149] Through this, if a part of the burner (300) cannot function normally due to damage or the like, costs can be minimized by replacing only the damaged part rather than replacing the entire burner (300).

[0150] In addition, when it is desired to change the size and shape of the combustion flame generated from the burner (300), the replacement cost can be minimized by selectively replacing at least one of the mixing unit (360), the first turning member (370), and the second turning member (380).

[0151] Below, other embodiments are described. In the following embodiments, descriptions of the same configurations as those in the previously described embodiments are omitted or simplified, and the differences are primarily described.

[0152] Figure 6 is an exploded perspective view of a burner according to one embodiment of the present invention.

[0153] Referring to FIG. 6, a burner (300_1) according to one embodiment of the present invention is different from the embodiments of FIGS. 1 to 5 in that it further includes a fifth fastening portion (331_1) and a sixth fastening portion (341_1).

[0154] According to one embodiment of the present invention, the first gas supply unit (330_1) may include a fifth fastening unit (331_1). The fifth fastening unit (331_1) may be positioned between the first cylinder (310_1) and the first gas supply unit (330_1), thereby connecting the first cylinder (310_1) and the first gas supply unit (330_1). That is, the first gas supply unit (330_1) may be connected to the first cylinder (310_1) through the fifth fastening unit (331_1).

[0155] The first cylinder (310_1) and the first gas supply unit (330_1) can be combined in a separable structure. That is, the fifth fastening unit (331_1) that combines the first cylinder (310_1) and the first gas supply unit (330_1) can have a structure that is easy to combine and separate.

[0156] For example, the fifth fastening portion (331_1) can connect the first cylinder (310_1) and the first gas supply portion (330_1) in a flange manner. The end of the side wall of the first cylinder (310_1) includes a first screw thread portion (311_1), and the first gas supply portion (330_1) includes a fifth fastening portion (331_1) in a flange shape, so that the first cylinder (310_1) and the first gas supply portion (330_1) can be connected through the connection of the first screw thread portion (311_1) and the fifth fastening portion (331_1).

[0157] When the fifth fastening part (331_1) connects the first cylinder (310_1) and the first gas supply part (330_1) in a flange manner, the influence of the fifth fastening part (331_1) on the flow of the first gas (1) flowing inside the first cylinder (310) can be minimized.

[0158] However, it is not limited to this, and if the first cylinder (310_1) and the first gas supply unit (330_1) have a structure that can be combined and separated, the fifth fastening unit may be of a different type.

[0159] According to one embodiment of the present invention, the second gas supply unit (340_1) may include a sixth fastening unit (341_1). The sixth fastening unit (341_1) may be positioned between the second cylinder (320_1) and the second gas supply unit (340_1), thereby connecting the second cylinder (320_1) and the second gas supply unit (340_1). That is, the second gas supply unit (340_1) may be connected to the second cylinder (320_1) via the sixth fastening unit (341_1).

[0160] The second cylinder (320_1) and the second gas supply unit (340_1) can be combined in a separable structure. That is, the sixth fastening unit (341_1) that combines the second cylinder (320_1) and the second gas supply unit (340_1) can have a structure that is easy to combine and separate.

[0161] For example, the sixth fastening portion (341_1) can be used to connect the second cylinder (320_1) and the second gas supply portion (340_1) in a flange manner. As shown in Fig. 6, the second cylinder (320_1) includes a second screw thread portion (322_1) on the side wall, and the second gas supply portion (340_1) includes a sixth fastening portion (341_1) in the shape of a flange, so that the second cylinder (320_1) and the second gas supply portion (340_1) can be connected through the connection of the second screw thread portion (322_1) and the sixth fastening portion (341_1).

[0162] When the sixth fastening part (341_1) connects the second cylinder (320_1) and the second gas supply part (340_1) in a flange manner, the influence of the sixth fastening part (341_1) on the flow of the second gas (2) flowing inside the second cylinder (320) can be minimized.

[0163] However, it is not limited to this, and any other method may be used as long as the second cylinder (320_1) and the second gas supply unit (340_1) have a structure that can be combined and separated.

[0164] According to one embodiment of the present invention, the first cylinder (310_1) is coupled to the first gas supply unit (330_1) through the fifth fastening unit (331_1), and the second cylinder (320_1) is coupled to the second gas supply unit (340_1) through the sixth fastening unit (341_1), thereby making it easier to replace the burner (300_1) components.

[0165] For example, if the first cylinder (310_1) is not functioning normally due to damage or the like, replacement costs can be minimized by replacing only the first cylinder (310_1).

[0166] Fig. 7 is an exploded perspective view of a burner according to one embodiment of the present invention. Fig. 8 is a cross-sectional view of a burner according to one embodiment of the present invention.

[0167] Referring to FIGS. 7 and 8, a burner (300_2) according to one embodiment of the present invention is different from the embodiments of FIGS. 1 to 6 in that it further includes a flow stabilization member (390_2).

[0168] According to one embodiment of the present invention, the flow stabilization member (390_2) may be placed on the second flow path (20). Specifically, the flow stabilization member (390_2) may be placed in an area defined by the outer circumferential surface of the first cylinder (310) and the inner circumferential surface of the second cylinder (320).

[0169] The fluid stabilization member (390_2) may include a plurality of holes (391_2). For example, as illustrated in FIG. 8, circular holes may be arranged in a circular pattern, but the present invention is not limited thereto.

[0170] Since the fluid stabilization member (390_2) includes a plurality of holes (391_2), the second gas (2) flowing in the second flow path (20) can flow more smoothly in the first direction (DR1).

[0171] For example, when the second gas supply unit (340) is arranged on the side wall of the second cylinder (320) as shown in FIG. 8, the second gas (2) provided to the second flow path (20) may flow irregularly.

[0172] Since the burner (300_2) includes a flow stabilization member (390_2), only the second gas (2) having a flow in the first direction (DR1) can selectively pass through.

[0173] That is, the second gas (2) is stably supplied to the mixing unit (360) through the fluid stabilization member (390_2), thereby suppressing or preventing the unstable formation of a combustion flame in the mixing unit (360).

[0174] Although embodiments of the present invention have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

[0175] [Explanation of symbols]

[0176] 1000: Electric furnace

[0177] M: Raw materials

[0178] 100: Melting furnace

[0179] 200: No AC electrode

[0180] 300: Burner

[0181] 310: Cylinder 1

[0182] 320: Cylinder 2

[0183] 330: Gas Supply Unit 1

[0184] 340: Second gas supply unit

[0185] 350: Cylinder extension

[0186] 360: Mixed section

[0187] 370: First turning member

[0188] 380: Second turning member

[0189] DR1: Direction 1

[0190] 1: First gas

[0191] 2: Second gas

[0192] 10: 1st Euro

[0193] 20: Second Euro

Claims

1. A first cylinder extending in a first direction; A second cylinder extending in the first direction and formed on the outside of the first cylinder and protruding more than the first cylinder in the first direction; A first gas supply unit for supplying a first gas to the interior of the first cylinder; A second gas supply unit that supplies a second gas to the outside of the first cylinder and the inside of the second cylinder; A cylinder extension coupled to the front of the first cylinder and protruding in the first direction more than the second cylinder; and A mixing unit coupled to the front of the second cylinder and having a through hole defined therein; Including, but not limited to, One end of the cylinder extension is placed on the through hole of the mixing portion. Burner.

2. In paragraph 1, A first flow path defined by the inner surface of the first cylinder and the cylinder extension, providing a path through which the first gas can flow; and A second flow path defined by the outer surface of the first cylinder, the inner surface of the second cylinder, the outer surface of the cylinder extension, and the inner surface of the mixing portion, which provides a path through which the second gas can flow; is defined, A first pivot member disposed on the first euro; and A second pivot member disposed on the second euro; including more, Burner.

3. In paragraph 1, Further comprising a first fastening member arranged between the first cylinder and the cylinder extension to connect the first cylinder and the cylinder extension. Burner.

4. In paragraph 2, At least a portion of the first pivot member is disposed inside the cylinder extension, Burner.

5. In paragraph 4, The cylinder extension portion further includes a recessed portion that is recessed from the inner surface of the cylinder extension toward the outer surface and extends in the first direction. Burner.

6. In paragraph 1, Further comprising a second fastening member arranged between the second cylinder and the mixing unit to connect the second cylinder and the mixing unit. Burner.

7. In paragraph 2, At least a portion of the second rotating member is disposed inside the mixing section, Burner.

8. In paragraph 2, Further comprising a third fastening member that connects the first pivot member and the first cylinder or the cylinder extension. Burner.

9. In paragraph 2, Further comprising a fourth fastening member that connects the second rotating member and the second cylinder or the mixing member. Burner.

10. In paragraph 2, The first pivot member and the second pivot member are arranged to overlap with respect to the first direction. Burner.

11. In paragraph 2, Further comprising a flow stabilization member arranged on the second euro to stabilize the flow of the second gas. Burner.

12. In paragraph 1, The above through hole is, A first part having a cross-sectional size that decreases as it goes in the first direction; and Including a second part extending from the first part and having a cross-sectional size that increases as it goes in the first direction, Burner.

13. In paragraph 12, One side of the above cylinder extension is arranged in the first part, One end of the cylinder extension is disposed at the boundary between the first part and the second part, Burner.

14. In paragraph 1, Further comprising a fifth fastening member arranged between the first gas supply member and the first cylinder and connecting the first gas supply member and the first cylinder. Burner.

15. In paragraph 1, Further comprising a sixth fastening member arranged between the second gas supply member and the second cylinder and connecting the second gas supply member and the second cylinder. Burner.

16. Melting furnace; and Including a burner coupled to the above melting furnace, The above burner, A first cylinder extending in a first direction; A second cylinder extending in the first direction and formed on the outside of the first cylinder and protruding more than the first cylinder in the first direction; A first gas supply unit for supplying a first gas to the interior of the first cylinder; A second gas supply unit that supplies a second gas to the outside of the first cylinder and the inside of the second cylinder; A cylinder extension coupled to the front of the first cylinder and protruding in the first direction more than the second cylinder; and A mixing unit coupled to the front of the second cylinder and having a through hole defined therein; Including, but not limited to, One end of the cylinder extension is placed on the through hole of the mixing portion. Electric furnace.

17. In paragraph 16, Further comprising a first fastening member arranged between the first cylinder and the cylinder extension to connect the first cylinder and the cylinder extension. Electric furnace.

18. In paragraph 16, Further comprising a second fastening member arranged between the second cylinder and the mixing unit to connect the second cylinder and the mixing unit. Electric furnace.

19. In paragraph 16, The above burner, A first flow path defined by the inner surface of the first cylinder and the cylinder extension, providing a path through which the first gas can flow; and A second flow path defined by the outer surface of the first cylinder, the inner surface of the second cylinder, the outer surface of the cylinder extension, and the inner surface of the mixing portion, which provides a path through which the second gas can flow; is defined, A first pivot member disposed on the first euro; and A second pivot member disposed on the second euro; including more, Electric furnace.

20. In paragraph 19, At least a portion of the first pivot member is disposed inside the cylinder extension, Electric furnace.

21. In paragraph 19, At least a portion of the second rotating member is disposed inside the mixing section, Electric furnace.

22. In paragraph 16, The above through hole is, A first part having a cross-sectional size that decreases as it goes in the first direction; and Including a second part extending from the first part and having a cross-sectional size that increases as it goes in the first direction, Electric furnace.

Images