KR-20260067008-A - ELECTRIC FURNACE SYSTEM

KR20260067008AKR 20260067008 AKR20260067008 AKR 20260067008AKR-20260067008-A

Abstract

An electric furnace system according to one embodiment of the present invention comprises: a melting furnace including a storage section for storing raw materials and a receiving section into which the raw materials stored in the storage section are introduced; a combustion tower for burning exhaust gas generated in the melting furnace; a cooling tower for cooling the combustion gas discharged from the combustion tower; a discharge section for discharging purified gas discharged from the cooling tower to the outside; a first exhaust gas transfer line connecting the melting furnace and the combustion tower to provide a path for the exhaust gas to move; a second exhaust gas transfer line connecting the combustion tower and the cooling tower to provide a path for the combustion gas to move; and a preheating gas transfer line providing a path for the preheating gas to move to preheat the raw materials.

Inventors

신범주
박병철
박승환
장병화
류승걸
윤성진
김은규
송민석

Assignees

현대제철 주식회사

Dates

Publication Date: 20260512
Application Date: 20241105

Claims (12)

A melting furnace that melts raw materials and discharges exhaust gas; A combustion tower connected to the melting furnace and combusting the exhaust gas discharged from the melting furnace to discharge combustion gas; A cooling tower connected to the combustion tower to cool and discharge the combustion gas; and A preheating gas transfer line that recovers heat from at least one of the combustion gas and the exhaust gas using a preheating gas and transfers heat to the melting furnace; including, Electric furnace system.
In paragraph 1, A first exhaust gas transfer line connecting the melting furnace and the combustion tower to provide a path for the exhaust gas to travel; and A second exhaust gas transfer line connecting the combustion tower and the cooling tower to provide a path for the combustion gas to travel; A further comprising an exhaust gas transfer line including, Electric furnace system.
In paragraph 2, The above preheating gas transfer line is, An outlet through which preheating gas is discharged from the space where the above raw material is stored; A first section extending from the above outlet and intersecting with the above second exhaust gas transfer line; A second section extending from the first section and intersecting with the first exhaust gas transfer line; and An inlet for supplying preheating gas to the space where the above raw material is stored; An electric furnace system including
In paragraph 3, The above outlet is positioned at a higher location than the above entrance, Electric furnace system.
In paragraph 3, A first heat exchanger positioned at the point where the above-mentioned preheating gas transfer line and the above-mentioned second exhaust gas transfer line intersect; and A second heat exchanger positioned at the point where the above preheating gas transfer line and the above first exhaust gas transfer line intersect; A heat exchanger further comprising, Electric furnace system.
In paragraph 5, In the first heat exchanger above, the preheating gas primarily recovers heat from the combustion gas, and In the second heat exchanger above, the preheating gas recovers heat secondarily from the exhaust gas, Electric furnace system.
In paragraph 1, The above-mentioned preheating gas is an electric furnace system comprising at least one of nitrogen (N2), argon (Ar), carbon dioxide ( CO2 ), and other gases.
In paragraph 1, The above raw material is an electric furnace system comprising at least one of iron scrap and reduced iron.
A melting furnace comprising a storage section for storing raw materials and a receiving section into which the raw materials stored in the storage section are introduced; A combustion tower for burning exhaust gas generated in the above melting furnace; A cooling tower for cooling the combustion gas discharged from the above combustion tower; A preheating gas transfer line comprising an inlet and an outlet connected to the storage unit, a flow path extending between the inlet and the outlet, and a branch pipe branched from the flow path and connected to the combustion tower; and A control unit for selectively opening and closing the above branch pipe, Electric furnace system.
In Paragraph 9, The above preheating gas transfer line further includes a gas sensor for measuring the carbon monoxide concentration of the preheating gas moving along the above path. Electric furnace system.
In Paragraph 10, The above control unit is, If the carbon monoxide (CO) concentration of the preheating gas from the gas sensor exceeds a preset value, the branch pipe is opened, and If the carbon monoxide (CO) concentration of the above preheating gas falls within a preset range, the branch pipe is closed. Electric furnace system.
In Paragraph 11, The above preheating gas includes carbon dioxide ( CO2 ), Electric furnace system.

Description

Electric Furnace System The present invention relates to an electric furnace system. Generally, the electric furnace process uses iron scrap as a basic raw material and utilizes electrical energy to produce molten steel. However, since this iron scrap contains a significant amount of impurities, electric furnace products are widely used in industries with lower quality standards, such as the construction sector. However, recently, in line with the international trend toward carbon neutrality, interest in technology for producing high-quality steel products through the electric furnace process has increased. Recently, in electric furnace processes, high-quality steel products are being produced using reduced iron, such as Direct Reduced Iron (DRI), Hot Briquetted Iron (HBI), and Iron Carbide, as raw materials in addition to iron scrap. Meanwhile, in general, in electric furnace processes, raw materials are preheated before being charged into the electric furnace to improve melting efficiency. One example is a method of preheating raw materials by bringing high-temperature waste gas generated in an electric furnace into direct contact with them. However, this method can cause carbon dioxide (CO₂) contained in the waste gas to react with the carbon (C) of HBI to generate carbon monoxide (CO). Consequently, there is a problem in that the carbon content of HBI decreases, thereby lowering the efficiency of the dissolution process. In addition, these exhaust gases are discharged after passing through combustion towers and cooling towers to remove hazardous substances, but there is a problem in that the heat from the exhaust gases is not being recycled during this process. FIG. 1 is a drawing illustrating an exemplary electric furnace system according to one embodiment of the present invention. Figure 2 is a diagram illustrating the operation of the electric furnace system shown in Figure 1. FIG. 3 is a drawing illustrating an electric furnace system according to one embodiment of the present invention. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed/connected/combined with the other component, or that a third component may be placed between them. Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content. "And/or" includes all one or more combinations that the associated configurations can define. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and are explicitly defined herein unless interpreted in an ideal or overly formal sense. Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a drawing illustr