JPWO2023095647A5

JPWO2023095647A5 -

Info

Publication number: JPWO2023095647A5
Application number: JP2023505466A
Authority: JP
Filing date: 2022-11-11
Publication date: 2023-10-27
Anticipated expiration: 2042-11-11

Claims

Includes measurement results for the smelting equipment, including the measurement results of the temperature and component concentration of the molten metal and the component concentration of the slag before or during the refining process in the refining equipment, and the flow rate and component concentration of the exhaust gas discharged from the refining equipment. an input section into which performance information and conditions for the refining process are input;
The model parameters of the model related to the blowing reaction in the refining equipment, the performance information, and the conditions of the refining process are stored in the refining process of the target charge using the past model parameters acquired from the database. a model determining unit that determines the model parameters;
an in-furnace state calculation unit that calculates in-furnace state quantities including the temperature and component concentration of the molten metal and the component concentration of slag using the determined model parameters;
Using the performance information including the results of the refining process of the target charge, based on an evaluation function including a term representing a material balance error and a heat balance error in the furnace from the start point to the end point of a specific period in the refining process. an in-furnace state estimating device, comprising: a model parameter calculation unit that calculates the model parameters in the refining process of the target charge;

The model determination unit averages the model parameters of the refining process in the past that are similar to the conditions of the refining process of the target charge, among the past model parameters stored in the database. The in-furnace state estimation device according to claim 1, which determines the model parameters in the refining process.

The model determination unit models the relationship between the past model parameters stored in the database and conditions of the refining process, including at least one of the number of treatments in the refining process, the date and time of the process, and the number of times the refining equipment is used. The in-furnace state estimation device according to claim 1, wherein the parameters in the refining process of the target charge are determined from the model.

The model parameters include an integrated amount of carbon injected into the furnace over a specific period, an integrated amount of carbon discharged outside the furnace over a specific period, an amount of oxygen introduced into the furnace, and an integrated amount of carbon discharged outside the furnace. a coefficient or a constant term for correcting at least one of the amount of oxygen discharged, the amount of oxygen used for oxidizing various metal impurities in the molten metal, and the cumulative amount of the molten metal temperature change due to the change in the amount of heat in the furnace for a specific period. The in-core state estimation device according to claim 1 , comprising:

The model parameters include an integrated amount of carbon injected into the furnace over a specific period, an integrated amount of carbon discharged outside the furnace over a specific period, an amount of oxygen introduced into the furnace, and an integrated amount of carbon discharged outside the furnace. a coefficient or a constant term for correcting at least one of the amount of oxygen discharged, the amount of oxygen used for oxidizing various metal impurities in the molten metal, and the cumulative amount of the molten metal temperature change due to the change in the amount of heat in the furnace for a specific period. The in-core state estimation device according to claim 2, comprising:

The model parameters include an integrated amount of carbon injected into the furnace over a specific period, an integrated amount of carbon discharged outside the furnace over a specific period, an amount of oxygen introduced into the furnace, and an integrated amount of carbon discharged outside the furnace. a coefficient or a constant term for correcting at least one of the amount of oxygen discharged, the amount of oxygen used for oxidizing various metal impurities in the molten metal, and the cumulative amount of the molten metal temperature change due to the change in the amount of heat in the furnace for a specific period. The in-core state estimation device according to claim 3, comprising:

The evaluation function is configured by a weighted sum of a term indicating a carbon balance, a term indicating an oxygen balance, and a term indicating a heat balance . Furnace state estimation device.

An in-core state estimation method executed by an in-core state estimation device, the method comprising:
Includes measurement results for the smelting equipment, including the measurement results of the temperature and component concentration of the molten metal and the component concentration of the slag before or during the refining process in the refining equipment, and the flow rate and component concentration of the exhaust gas discharged from the refining equipment. an input step in which performance information and conditions for the refining process are input;
The model parameters of the model related to the blowing reaction in the refining equipment, the performance information, and the conditions of the refining process are stored in the refining process of the target charge using the past model parameters acquired from the database. a model determining step of determining the model parameters;
a furnace state calculation step of calculating the state quantities in the furnace including the temperature and component concentration of the molten metal and the component concentration of the slag using the determined model parameters;
Using the performance information including the results of the refining process of the target charge, the method is based on an evaluation function including a term representing a material balance error and a heat balance error in the furnace from the start point to the end point of a specific period in the refining process. and a model parameter calculation step of calculating the model parameters in the refining process of the target charge.

The model determining step averages the model parameters of the past refining process that are similar to the conditions of the refining process of the target charge, among the past model parameters stored in the database. The in-furnace state estimation method according to claim 8 , wherein the model parameters in the refining process are determined.

The model determining step models the relationship between the past model parameters stored in the database and the conditions of the refining process, including at least one of the number of treatments in the refining process, the date and time of the process, and the number of times the refining equipment is used. 9. The in-furnace state estimation method according to claim 8 , wherein the parameters in the refining process of the target charge are determined from the model.

Based on the temperature and component concentration of the molten metal and the component concentration of the slag estimated by the furnace state estimation method according to any one of claims 8 to 10 , the flow rate and speed of top-blowing oxygen, and the height of the top-blowing lance are determined. Then, the refining operation is carried out by determining at least one of the following: the flow rate of bottom blowing gas, the amount and timing of inputting auxiliary materials such as lime and iron ore, the timing of sampling the molten metal, and the timing of ending blowing. A method for producing molten steel.