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KR-102963798-B1 - Method for charging materials into blast furnace

KR102963798B1KR 102963798 B1KR102963798 B1KR 102963798B1KR-102963798-B1

Abstract

A method for charging raw materials into a blast furnace according to one embodiment of the present invention relates to a method for charging raw materials into a melting furnace in which a raw material receiving portion is defined internally, and is configured to include the steps of: (a) placing a first coke layer in the raw material receiving portion; (b) placing a first ore layer on top of the coke layer; (c) placing a mixed layer containing reduced iron on the first ore layer; and (d) placing a second ore layer on the mixed layer.

Inventors

  • 김장원
  • 안진영
  • 김수연
  • 이흥민
  • 김영현
  • 오구록
  • 양동혁
  • 송재일

Assignees

  • 현대제철 주식회사

Dates

Publication Date
20260511
Application Date
20230721

Claims (19)

  1. The present invention relates to a method for loading raw materials into a melting furnace having a raw material receiving portion comprising, based on the central axis of the melting furnace, a wall portion adjacent to the inner wall of the melting furnace, a center portion adjacent to the central axis of the melting furnace, and a first intermediate portion formed between the wall portion and the center portion, which is a portion adjacent to the wall portion and a second intermediate portion adjacent to the center portion. (a) a step of arranging a first coke layer across the wall portion of the raw material receiving portion and the first intermediate portion; (b) a step of placing a first ore layer on top of the first coke layer across the wall portion of the raw material receiving portion and the first intermediate portion; (c) a step of placing a mixed layer containing reduced iron on top of the first ore layer across the first intermediate part and the second intermediate part of the raw material receiving part; (d) a step of placing a second ore layer on top of the mixing layer across the wall portion and the first intermediate portion of the raw material receiving portion; and (e) a step of placing a second coke layer on top of at least a portion of the mixed layer across the second intermediate part and the center of the raw material receiving part; Includes, The above mixing layer is disposed in the above intermediate part, and The above central part is formed solely of the above second coke layer, and The above step (c) is, Step (c-1) of placing a first mixing layer on top of the first ore layer; Step (c-2) of placing a second mixing layer on top of the first mixing layer; Step (c-3) of placing a third mixing layer on top of the second mixing layer; Step (c-4) of placing a fourth mixing layer on top of the third mixing layer; and Step (c-5) of placing a fifth mixing layer on top of the fourth mixing layer; including, Method of charging raw materials into a blast furnace.
  2. In paragraph 1, The average particle size of the second ore layer is smaller than the average particle size of the first ore layer. Method of charging raw materials into a blast furnace.
  3. In paragraph 1, The above mixed layer contains 3 to 10 weight percent of reduced iron relative to the 1 charge weight of the raw material, Method of charging raw materials into a blast furnace.
  4. In paragraph 3, If 1 weight percent of the raw material charged into the above melting furnace is replaced with reduced iron, Replacing 4.4 kg of pulverized coal and coke per ton of molten iron, Method of charging raw materials into a blast furnace.
  5. In paragraph 1, Based on the total weight of the reduced iron, the amount of reduced iron contained in the first and second mixed layers is greater than the amount of reduced iron contained in the third to fifth mixed layers. Method of charging raw materials into a blast furnace.
  6. In paragraph 5, Based on the total weight of the above reduced iron, The amount of reduced iron contained in the second mixed layer is greater than the amount of reduced iron contained in the first mixed layer. Method of charging raw materials into a blast furnace.
  7. In paragraph 5, Based on the total weight of the above reduced iron, The amount of reduced iron contained in the first mixed layer and the second mixed layer is 60 weight% or more, Method of charging raw materials into a blast furnace.
  8. In paragraph 1, The above-mentioned raw material receiving portion has a cylindrical shape in which the diameter narrows toward the top, and The first coke layer, the first ore layer, and the second ore layer are disposed from the wall portion to the intermediate portion, The first coke layer, the first ore layer, the mixing layer, and the second ore layer are arranged at an angle from the wall toward the center. Method of charging raw materials into a blast furnace.
  9. In paragraph 8, Based on the length (R) from the central axis to the inner wall, The length of the above wall section is 5/55R from the inner wall, and The length of the above middle section is 4 1/55R from the above wall section, and The length of the above center is defined as 9/55R from the above middle section, Method of charging raw materials into a blast furnace.
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  11. The invention relates to a method of charging raw materials into a melting furnace in which a raw material receiving section is defined internally, and, The above-mentioned raw material receiving part is, A cylindrical shape having a diameter that narrows toward the top, and a wall portion adjacent to the inner wall with respect to the central axis of the melting furnace; A central part adjacent to the above central axis; and An intermediate portion formed between the above-mentioned wall portion and the center portion, defined as a first intermediate portion adjacent to the above-mentioned wall portion and a second intermediate portion adjacent to the above-mentioned center portion; comprising A step of arranging a first coke layer across the above wall portion and the above first intermediate portion; A step of placing a first ore layer containing ore on top of the first coke layer across the above wall portion and the above first intermediate portion; A step of placing a mixed layer containing reduced iron on top of the first ore layer across the first intermediate section and the second intermediate section; A step of placing a second ore layer on top of the first ore layer of the wall portion and the mixed layer of the first intermediate portion; and A step of arranging a second coke layer across the second intermediate portion and the center; Includes, The above mixing layer is disposed in the above intermediate part, and The above central part is formed solely of a second coke layer, and The step of placing the above-mentioned mixture layer is, A step of placing a first mixing layer on top of the first ore layer; A step of placing a second mixing layer on top of the first mixing layer; A step of placing a third mixing layer on top of the second mixing layer; A step of placing a fourth mixing layer on top of the third mixing layer; and A step of placing a fifth mixing layer on top of the fourth mixing layer; including, Method of charging raw materials into a blast furnace.
  12. In Paragraph 11, The above mixed layer contains 3 to 10 weight percent of reduced iron relative to the 1 charge weight of the raw material, Method of charging raw materials into a blast furnace.
  13. In Paragraph 12, If 1 weight percent of the raw material charged into the above melting furnace is replaced with reduced iron, Replacing 4.4 kg of pulverized coal and coke per ton of molten iron, Method of charging raw materials into a blast furnace.
  14. In Paragraph 11, Based on the total weight of the reduced iron, the amount of reduced iron contained in the first and second mixed layers is greater than the amount of reduced iron contained in the third to fifth mixed layers. Method of charging raw materials into a blast furnace.
  15. In Paragraph 14, Based on the total weight of the above reduced iron, The amount of reduced iron contained in the second mixed layer is greater than the amount of reduced iron contained in the first mixed layer. Method of charging raw materials into a blast furnace.
  16. In Paragraph 14, Based on the total weight of the above reduced iron, The amount of reduced iron contained in the first mixed layer and the second mixed layer is 60 weight% or more, Method of charging raw materials into a blast furnace.
  17. In Paragraph 11, The average particle size of the second ore layer is smaller than the average particle size of the first ore layer. Method of charging raw materials into a blast furnace.
  18. In Paragraph 11, The amount of reduced iron placed in the first intermediate section is greater than the amount of reduced iron placed in the second intermediate section. Method of charging raw materials into a blast furnace.
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Description

Method for charging materials into blast furnace The present invention relates to a method for charging raw materials into a blast furnace. Recently, the development of ironmaking technology has been changing due to stricter regulations on environmental pollution. In accordance with carbon emission regulations, the ironmaking industry is considering ways to ensure stable operations by reducing the amount of raw materials used. One method to minimize fuel (coal, coke, pulverized coal) while maintaining the productivity of ironmaking operations is to increase the use of raw materials with high iron content. Direct reduced iron (DRI/HBI; Hot Briquetted Iron) (hereinafter referred to as "reduced iron") is used as an alternative iron source in the ironmaking and steelmaking sectors, and it has the effect of reducing fuel consumption for the purpose of reducing carbon emissions through increased productivity. In the ironmaking field, reduced iron is charged into the blast furnace, and as an alternative iron source, reduced iron is operated in the same facility as raw materials for blast furnace charging, such as sintered ore, lump steel (refined ore), and pellets. Reduced iron has high strength and heavy weight, which can cause wear on the main body due to continuous impact when charged into the blast furnace. Also, due to the high iron content characteristic of blast furnace operation, it melts instantly at a specific temperature of 1450 to 1470°C, which can cause the distribution of the charge in the blast furnace to collapse and lead to instability in blast furnace operation. In addition, if reduced iron is concentrated in specific areas within the blast furnace due to excessive production of molten material, the liquid phase area increases, which adversely affects the air permeability within the blast furnace and can lead to instability in blast furnace operation. FIG. 1 is a drawing illustrating an exemplary cross-section of a melting furnace to explain a method for charging raw materials into a blast furnace according to one embodiment of the present invention. FIG. 2 is a flowchart illustrating a method for charging raw materials into a blast furnace according to one embodiment of the present invention. Figure 3 is an enlarged view of part A shown in Figure 1. Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention is not limited or restricted by the following embodiments. Additionally, when it is stated that a component (or area, layer, part, etc.) is "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. 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. In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification. Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Unless otherwise specified, the notation 'A ~ B' for numerical values A and B shall mean 'A or greater, B or less'. In such notation, if a unit is attached only to numerical value B, that unit shall also apply to numerical value A. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a drawing illustrating an exemplary cross-section of a melting furnace to explain a method for charging raw materials into a blast furnace according to one embodiment of the present invention. Referring to FIG. 1, the melting furnace (100) can produce molten iron by melting raw materials including iron ore. For example, in this embodiment, the melting furnace (100) may be a blast furnace. The raw material receiving section (200) can be defined inside the melting furnace (100). The raw material receiving section (200) has a roughly cylindrical shape with a diameter that narrows toward the