公开(公告)号：US20220126359A1

公开(公告)日：2022-04-28

申请号：US17436199

申请日：2020-02-28

Applicant: JFE STEEL CORPORATION

Inventor： Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Yoshinari HASHIMOTO ,  Ryosuke MASUDA ,  Taiga KORIYAMA ,  Ryo MORISHITA

IPC: B22D11/20 ,  B22D11/115

Abstract: A continuously casting method including arranging temperature measuring elements according to specified conditions, selecting as evaluation targets for temperatures of copper plates on a wide face of mold values measured by the temperature measuring elements arranged closer to a center in a width direction of a cast slab than short sides of the cast slab under continuous casting at levels of 50 mm or more lower in a slab withdrawal direction than a meniscus of a molten steel in a mold, and adjusting a casting condition such that a standard deviation of the values measured over the width direction of the copper plates on the wide face of mold at a same level in the slab withdrawal direction is 20° C. or lower.

公开(公告)号：US20220333921A1

公开(公告)日：2022-10-20

申请号：US17761642

申请日：2020-09-04

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Miho SATO

IPC: G01B21/08 ,  B22D11/22

Abstract: An in-mold solidified shell thickness estimation apparatus includes: an input device; a model database configured to store a model formula and a parameter related to a solidification reaction of a molten steel inside a mold of a continuous casting facility; and a heat transfer model calculator configured to estimate an in-mold solidified shell thickness by calculating temperature distributions of the mold and of the molten steel inside the mold by solving a three-dimensional unsteady heat transfer equation. The heat transfer model calculator is configured to correct errors in a temperature of a mold copper plate and in an amount of heat removed from the mold, by correcting an overall heat transfer coefficient between the mold copper plate and the solidified shell.

公开(公告)号：US20230313329A1

公开(公告)日：2023-10-05

申请号：US18011732

申请日：2021-06-15

Applicant: JFE STEEL CORPORATION

Inventor： Yoshinari HASHIMOTO ,  Ryosuke MASUDA

IPC: C21B7/24 ,  C21B5/00

CPC classification number: C21B7/24 ,  C21B2300/04 ,  C21B5/006

Abstract: An operation guidance method includes: predicting a state in a blast furnace when a current operation state is retained in a future, by using a physical model that is able to calculate the state in the blast furnace; and displaying, on an output device, an oxygen balance in a raceway region, a carbon balance in an entire furnace, and an oxygen balance derived from iron oxide in the entire furnace, when the state in the blast furnace is predicted.

公开(公告)号：US20230251036A1

公开(公告)日：2023-08-10

申请号：US18010985

申请日：2021-06-14

Applicant: JFE STEEL CORPORATION

Inventor： Yoshinari HASHIMOTO ,  Shunpei SHIGENO ,  Ryosuke MASUDA ,  Koki UCHIDA

IPC: F27B1/26 ,  F27D19/00 ,  C21B7/24

CPC classification number: F27B1/26 ,  F27D19/00 ,  C21B7/24 ,  F27D2019/004

Abstract: A method for controlling a hot metal temperature, includes: a first control loop for calculating a target value of pulverized coal ratio such that a hot metal temperature, predicted by a physical model that is able to calculate conditions inside a blast furnace, falls within a preset target range; and a second control loop for calculating pulverized coal flow rate manipulation quantity to compensate for a deviation between the pulverized coal ratio target value and a current pulverized coal ratio actual value.

公开(公告)号：US20240318269A1

公开(公告)日：2024-09-26

申请号：US18578006

申请日：2022-07-15

Applicant: JFE STEEL CORPORATION

Inventor： Yoshinari HASHIMOTO ,  Ryosuke MASUDA

IPC: C21B7/24

CPC classification number: C21B7/24

Abstract: A hot metal temperature prediction method includes a reaction amount calculation step (S1) of calculating a reaction amount inside a blast furnace using a physical model that takes into account reactions and heat transfer phenomena inside the blast furnace, a deviation calculation step (S2) of calculating a deviation between the reaction amount calculated using the physical model and a measured reaction amount, a model parameter adjustment step (S3) of adjusting a parameter of the physical model that causes drift in a gas inside the blast furnace, so that the calculated deviation is reduced, and a hot metal temperature prediction step (S4) of predicting a future hot metal temperature using the physical model for which the parameter was adjusted.

公开(公告)号：US20220152695A1

公开(公告)日：2022-05-19

申请号：US17440150

申请日：2020-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA

IPC: B22D11/18

Abstract: A device includes: an input device configured to receive an input of measurement results of a temperature and components of molten steel in a tundish of continuous casting facilities, measurement results of a width, a thickness, and a casting speed of a cast slab casted in the continuous casting facilities, and molten steel flow rate distribution in a mold; a model database configured to store a model expression and a parameter related to solidification reaction of molten steel in the mold; a convertor configured to convert a molten steel flow rate in the mold into a heat conductivity parameter; and a calculator configured to estimate a solidified shell thickness in the mold based on temperature distribution of the mold and steel in the mold calculated by solving a three-dimensional transient heat conduction equation using the measurement results.

公开(公告)号：US20240337447A1

公开(公告)日：2024-10-10

申请号：US18579405

申请日：2022-07-11

Applicant: JFE STEEL CORPORATION

Inventor： Yoshinari HASHIMOTO ,  Ryosuke MASUDA

IPC: F27D21/00 ,  F27D19/00 ,  F27D21/02

CPC classification number: F27D21/0028 ,  F27D21/02 ,  F27D2019/0071

Abstract: A blast furnace slag level estimation method and blast furnace slag level estimation apparatus can estimate the liquid level of slag to a high degree of accuracy. An operation guidance method, method of producing hot metal, and operation guidance apparatus also provide guidance for the operation of a blast furnace based on a highly accurately estimated liquid level of slag. The blast furnace slag level estimation method includes a step (S2) of calculating a liquid level of melt containing slag for each region in a plurality of regions separated by a low permeability zone, using a physical model that takes at least one of hot metal tapping rate, slag tapping rate, hot metal production rate, and slag production rate as an input and that is based on a mass balance assuming existence of the low permeability zone with poor permeation of slag at a bottom of a furnace.

公开(公告)号：US20230226600A1

公开(公告)日：2023-07-20

申请号：US18009909

申请日：2021-04-09

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Takehide HIRATA

IPC: B22D11/18 ,  B22D11/04 ,  B22D2/00

CPC classification number: B22D11/182 ,  B22D11/04 ,  B22D2/00

Abstract: A breakout prediction method includes: a step of inputting a dimension of a solid product withdrawn from a mold in a continuous casting machine; a step of detecting a temperature of the mold by a plurality of thermometers embedded in the mold; a step of executing interpolation processing on the detected temperatures detected by the plurality of thermometers according to the dimension of the solid product; a step of calculating, based on the temperatures calculated by executing the interpolation processing, a component in a direction orthogonal to an influence coefficient vector obtained by principal component analysis as a degree of deviation from during a normal operation in which a breakout has not occurred; and a step of predicting a breakout based on the degree of deviation.

公开(公告)号：US20210387250A1

公开(公告)日：2021-12-16

申请号：US17422674

申请日：2020-02-06

Applicant: JFE STEEL CORPORATION

Inventor： Ryosuke MASUDA ,  Yoshinari HASHIMOTO ,  Akitoshi MATSUI ,  Shugo MORITA ,  Tatsuro HAYASHIDA ,  Taiga KORIYAMA ,  Ryo MORISHITA

IPC: B22D11/18 ,  B22D11/115 ,  G05B15/02

Abstract: A control method for a continuous casting machine, includes: estimating, by on-line real-time system, a flow state of molten steel in a mold by using an operation condition of a continuous casting machine and temperature data on the molten steel in the mold; calculating, by on-line real-time system, a molten steel flow index based on the estimated flow state of the molten steel, the molten steel flow index being a factor of mixing of an impurity into a casting inside the mold; and controlling the operation condition of the continuous casting machine such that the calculated molten steel flow index is within an appropriate range.