An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO.sub.2—N.sub.2 mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO.sub.2—N.sub.2 mixed gas through the decarburization converter flue gas; obtaining O.sub.2—CO.sub.2—N.sub.2 mixed gas through the decarburization converter flue gas; obtaining first-purity CO.sub.2 gas through the second-purity CO.sub.2—N.sub.2 mixed gas; and using the first-purity CO.sub.2—N.sub.2 mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO.sub.2—N.sub.2 mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O.sub.2—CO.sub.2—N.sub.2 mixed gas and the first-purity CO.sub.2 gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.

A molten metal component estimation device including: an input device configured to receive measurement information about a refining facility including measurement results regarding an optical characteristic; a model database that stores model expressions and model parameters, regarding a blowing process reaction, including a model expression and model parameters representing a relation between the oxygen efficiency in decarburization and a carbon concentration in a molten metal in the refining facility; and a processor configured to: estimate component concentrations of the molten metal including the carbon concentration in the molten metal by using the measurement information, the model expressions and the model parameters; estimate the carbon concentration in the molten metal based on the measurement results; and determine the model expression and the model parameters to be used when estimating the component concentrations of the molten metal, based on the estimation result of the carbon concentration in the molten metal.

A molten metal component estimation device including: an input device configured to receive measurement information about a refining facility including measurement results regarding an optical characteristic; a model database that stores model expressions and model parameters, regarding a blowing process reaction, including a model expression and model parameters representing a relation between the oxygen efficiency in decarburization and a carbon concentration in a molten metal in the refining facility; and a processor configured to: estimate component concentrations of the molten metal including the carbon concentration in the molten metal by using the measurement information, the model expressions and the model parameters; estimate the carbon concentration in the molten metal based on the measurement results; and determine the model expression and the model parameters to be used when estimating the component concentrations of the molten metal, based on the estimation result of the carbon concentration in the molten metal.

The invention relates to a method and a system for determining the steel-tapping quantity of a converter, which consider that the working environment of the steel-making process of the converter is severe, the measurement is difficult and the interference of other factors is large, and provide a data-driven prediction model based on data, combine a Principal Component Analysis (PCA) with a RBF neural network, find the relation and the internal relation among variables by carrying out mathematical analysis on the related internal structure of the original variables, can quickly and accurately realize the prediction of the steel-tapping quantity of the converter, improve the component hit rate and the product stability in the steel-making process of the converter, are beneficial to realizing the control of narrow regions of steel-making components, save the alloying cost and have good application prospects in the field of ferrous metallurgy.

The invention relates to a method and a system for determining the steel-tapping quantity of a converter, which consider that the working environment of the steel-making process of the converter is severe, the measurement is difficult and the interference of other factors is large, and provide a data-driven prediction model based on data, combine a Principal Component Analysis (PCA) with a RBF neural network, find the relation and the internal relation among variables by carrying out mathematical analysis on the related internal structure of the original variables, can quickly and accurately realize the prediction of the steel-tapping quantity of the converter, improve the component hit rate and the product stability in the steel-making process of the converter, are beneficial to realizing the control of narrow regions of steel-making components, save the alloying cost and have good application prospects in the field of ferrous metallurgy.

An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO.sub.2N.sub.2 mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO.sub.2N.sub.2 mixed gas through the decarburization converter flue gas; obtaining O.sub.2CO.sub.2N.sub.2 mixed gas through the decarburization converter flue gas; obtaining first-purity CO.sub.2 gas through the second-purity CO.sub.2N.sub.2 mixed gas; and using the first-purity CO.sub.2N.sub.2 mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO.sub.2N.sub.2 mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O.sub.2CO.sub.2N.sub.2 mixed gas and the first-purity CO.sub.2 gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.

An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO.sub.2N.sub.2 mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO.sub.2N.sub.2 mixed gas through the decarburization converter flue gas; obtaining O.sub.2CO.sub.2N.sub.2 mixed gas through the decarburization converter flue gas; obtaining first-purity CO.sub.2 gas through the second-purity CO.sub.2N.sub.2 mixed gas; and using the first-purity CO.sub.2N.sub.2 mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO.sub.2N.sub.2 mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O.sub.2CO.sub.2N.sub.2 mixed gas and the first-purity CO.sub.2 gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.

Provided are a method and an arrangement for operating a metallurgical furnace. The method comprises a feeding step, and a temperature controlling step for controlling the temperature of a molten metal layer and a slag layer in a furnace space of the metallurgical furnace. The temperature controlling step comprises a first measuring step for measuring the slag temperature (T.sub.slag), a second measuring step for measuring the slag liquidus temperature (T.sub.slag, liquidus), and a calculating step for calculating a superheat temperature (T.sub.superheat) by calculating the temperature difference between the slag temperature (T.sub.slag) and the slag liquidus temperature (T.sub.slag, liquidus). In case the calculated superheat temperature (T.sub.superheat) is outside a predefined superheat temperature range (T.sub.superheat set), the method comprises an adjusting step for adjusting to adjust the actual superheat temperature. Also provided are computer program products.

Provided are a method and an arrangement for operating a metallurgical furnace. The method comprises a feeding step, and a temperature controlling step for controlling the temperature of a molten metal layer and a slag layer in a furnace space of the metallurgical furnace. The temperature controlling step comprises a first measuring step for measuring the slag temperature (T.sub.slag), a second measuring step for measuring the slag liquidus temperature (T.sub.slag, liquidus), and a calculating step for calculating a superheat temperature (T.sub.superheat) by calculating the temperature difference between the slag temperature (T.sub.slag) and the slag liquidus temperature (T.sub.slag, liquidus). In case the calculated superheat temperature (T.sub.superheat) is outside a predefined superheat temperature range (T.sub.superheat set), the method comprises an adjusting step for adjusting to adjust the actual superheat temperature. Also provided are computer program products.

A production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces. Electric arc furnaces located in two positions are connected in series, wherein the electric arc furnace in a first position is dephosphorization electric arc furnace, and the electric arc furnace in a second position is a decarbonization electric arc furnace. The production method includes: performing smelting by combining a decarbonization electric arc furnace and 1-3 dephosphorization electric arc furnaces; a specific process of performing the smelting includes: in a charging period of the 1-3 dephosphorization electric arc furnaces, adding the full-scrap steel for the smelting, lime, slag in the decarbonization electric arc furnace, auxiliary materials and carbon powder or a carbon block into the dephosphorization electric arc furnace.