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WO2025150235A1 - Procédé de commande et dispositif de commande de haut fourneau - Google Patents

Procédé de commande et dispositif de commande de haut fourneau

Info

Publication number
WO2025150235A1
WO2025150235A1 PCT/JP2024/036669 JP2024036669W WO2025150235A1 WO 2025150235 A1 WO2025150235 A1 WO 2025150235A1 JP 2024036669 W JP2024036669 W JP 2024036669W WO 2025150235 A1 WO2025150235 A1 WO 2025150235A1
Authority
WO
WIPO (PCT)
Prior art keywords
blast furnace
temperature distribution
heat transfer
molten iron
poor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/036669
Other languages
English (en)
Japanese (ja)
Inventor
亮太郎 松永
哲也 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2024574564A priority Critical patent/JP7722610B1/ja
Publication of WO2025150235A1 publication Critical patent/WO2025150235A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices

Definitions

  • the amount of heat supplied to the molten pig iron is determined by unknown quantities such as the combustibility of the coke and pulverized coal and the temperature of the furnace core coke, and also changes from moment to moment due to heat extraction by the furnace wall and the powder phase. For this reason, it is difficult to accurately detect the solidified layer with an estimation method based only on the thermal energy balance such as the method described in Patent Document 2.
  • the method described in Patent Document 3 uses the temperature measured at the bottom plate of the blast furnace as it is, but the temperature of the bottom of the blast furnace varies greatly not only depending on the inactive state inside the blast furnace but also on the strength or weakness of the cooling capacity and the outside air temperature of the blast furnace. For this reason, it is difficult to accurately diagnose the inactive state of the bottom of the blast furnace with the method described in Patent Document 3.
  • the temperature distribution estimation step may include a step of estimating the temperature distribution at the bottom of the blast furnace, taking into account heat transfer from the outside air around the blast furnace and heat transfer from the cooling water flowing through the piping of the blast furnace.
  • FIG. 1 is a block diagram showing the configuration of a blast furnace control device according to one embodiment of the present invention.
  • the blast furnace control device 1 according to one embodiment of the present invention is configured with an information processing device such as a computer.
  • the blast furnace control device 1 controls the operating state of the blast furnace 2 by executing a computer program with an arithmetic processing device such as a CPU in the information processing device.
  • an arithmetic processing device such as a CPU in the information processing device.
  • multiple thermocouples 2a are installed on the sidewall bricks and hearth bricks of the blast furnace 2, including around the tapping hole, and each thermocouple 2a inputs an electric signal indicating the temperature of the blast furnace 2 at the installation position to the blast furnace control device 1.
  • the blast furnace control device 1 having such a configuration executes the blast furnace control process described below to prevent the formation of a poor molten iron flow area at the bottom of the blast furnace 2. Below, the operation of the blast furnace control device 1 when executing the blast furnace control process will be described with reference to FIG. 2.
  • the blast furnace control device 1 constructs a numerical model of the blast furnace 2 for numerically calculating the temperature distribution of the blast furnace 2.
  • the numerical model of the blast furnace 2 is a numerical model of the size, shape, and material of the blast furnace 2, and can be generated from CAD data of the blast furnace 2 using publicly known technology.
  • the numerical model of the blast furnace 2 is a model of the region below the tuyere of the blast furnace 2, including the solidified layer of pig iron remaining at the hearth, the coke packed layer, the hearth residue such as molten pig iron slag present in the gaps in the coke packed layer, and the iron shell structure and refractories of the furnace body, as shown in Figures 3(a) to (c).
  • step S1 a mesh structure for numerical calculation is generated within the numerical model of the blast furnace 2.
  • the material of the blast furnace 2 is set to have temperature dependency in order to perform the heat transfer analysis described later with high accuracy. This completes the process of step S1, and the blast furnace control process proceeds to the process of step S2.
  • the blast furnace control device 1 sets the boundary conditions of heat transfer in the numerical model of the blast furnace 2 according to the specifications and current operating state of the blast furnace 2 based on information previously set by the operator.
  • the boundary conditions of heat transfer include the cooling capacity of the blast furnace 2 and the heat transfer from the molten metal and slag in the blast furnace 2.
  • Specific examples of the cooling capacity of the blast furnace 2 include heat transfer from the outside air on the surface of the steel shell of the blast furnace wall, heat transfer from the cooling water flowing in the cooling stave piping, and heat transfer from the cooling water flowing in the hearth refractory piping.
  • the blast furnace control device 1 estimates the temperature distribution in the region of the modeled blast furnace 2 by performing a heat transfer analysis to calculate the following mathematical formula (1) for each calculation region (rectangular region formed by generating a mesh structure) in the numerical model of the blast furnace 2.
  • C p is the specific heat (J/(kg ⁇ K)) of the calculation target region
  • ⁇ is the density (kg/m 3 ) of the calculation target region
  • T is the temperature (K)
  • t is the time (s)
  • ⁇ is the thermal conductivity (W/(m ⁇ K)) of the calculation target region
  • Q is the amount of heat transfer (J) for the calculation target region
  • ⁇ V is the unit volume (m 3 ) of the calculation target region.
  • step S4 the blast furnace control process proceeds to the process of step S5.
  • this technology was applied to a large blast furnace with four tap holes of about 5000 m3 .
  • a numerical model of the blast furnace was constructed based on the size, shape, and material of the target blast furnace.
  • the specific heat, thermal conductivity, and density of each material were input to create a numerical model of the blast furnace.
  • the boundary conditions of heat transfer were set.
  • piping through which cooling water flows is laid out on the hearth base.
  • the heat transfer coefficient of the hearth base was set to 30.6 W/ m2 ⁇ K and the cooling water temperature was set to 50°C.
  • the present invention provides a blast furnace control method and control device that can accurately determine the risk of a poor molten iron flow area forming at the bottom of the blast furnace and prevent the formation of a poor molten iron flow area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Un procédé de commande de haut fourneau selon la présente invention comprend : une étape d'estimation de distribution de température consistant à estimer la distribution de température d'une section inférieure de haut fourneau par exécution d'une analyse de transfert de chaleur à l'aide d'un modèle numérique de haut fourneau ; une étape de détermination consistant à déterminer le risque de formation d'une région de défaillance de l'écoulement de fonte au niveau de la section inférieure de haut-fourneau sur la base d'une valeur de différence entre la distribution de température estimée dans l'étape d'estimation de distribution de température et une valeur de mesure réelle de la température de la section inférieure de haut-fourneau ; et une étape de régulation consistant à réguler des conditions de fonctionnement de haut-fourneau sur la base du résultat de détermination dans l'étape de détermination de sorte qu'une région de défaillance de l'écoulement de fonte n'est pas formée.
PCT/JP2024/036669 2024-01-09 2024-10-15 Procédé de commande et dispositif de commande de haut fourneau Pending WO2025150235A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2024574564A JP7722610B1 (ja) 2024-01-09 2024-10-15 高炉の制御方法及び制御装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-001088 2024-01-09
JP2024001088 2024-01-09

Publications (1)

Publication Number Publication Date
WO2025150235A1 true WO2025150235A1 (fr) 2025-07-17

Family

ID=96386850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/036669 Pending WO2025150235A1 (fr) 2024-01-09 2024-10-15 Procédé de commande et dispositif de commande de haut fourneau

Country Status (2)

Country Link
JP (1) JP7722610B1 (fr)
WO (1) WO2025150235A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10273708A (ja) * 1997-03-28 1998-10-13 Nippon Steel Corp 高炉炉底状況の推定方法
JP2003013118A (ja) * 2001-07-05 2003-01-15 Nippon Steel Corp 高炉炉下部の管理方法
JP2018024935A (ja) * 2016-08-02 2018-02-15 Ｊｆｅスチール株式会社 溶銑温度予測方法、溶銑温度予測装置、高炉の操業方法、操業ガイダンス装置、溶銑温度制御方法、及び溶銑温度制御装置
WO2021220751A1 (fr) * 2020-04-30 2021-11-04 Ｊｆｅスチール株式会社 Procédé de détection de fluctuations dans une couche de coagulation et procédé de fonctionnement de haut-fourneau
JP2021179004A (ja) * 2020-05-15 2021-11-18 Ｊｆｅスチール株式会社 炉底の昇温方法および高炉の立ち上げ方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10273708A (ja) * 1997-03-28 1998-10-13 Nippon Steel Corp 高炉炉底状況の推定方法
JP2003013118A (ja) * 2001-07-05 2003-01-15 Nippon Steel Corp 高炉炉下部の管理方法
JP2018024935A (ja) * 2016-08-02 2018-02-15 Ｊｆｅスチール株式会社 溶銑温度予測方法、溶銑温度予測装置、高炉の操業方法、操業ガイダンス装置、溶銑温度制御方法、及び溶銑温度制御装置
WO2021220751A1 (fr) * 2020-04-30 2021-11-04 Ｊｆｅスチール株式会社 Procédé de détection de fluctuations dans une couche de coagulation et procédé de fonctionnement de haut-fourneau
JP2021179004A (ja) * 2020-05-15 2021-11-18 Ｊｆｅスチール株式会社 炉底の昇温方法および高炉の立ち上げ方法

Also Published As

Publication number Publication date
JPWO2025150235A1 (fr) 2025-07-17
JP7722610B1 (ja) 2025-08-13

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