Soft measuring system and method for quality indexes of multielement molten iron of blast furnace

Abstract

A soft measurement system and method for the quality index of blast furnace multi-element molten iron, the system includes: a data acquisition unit, a data preprocessing unit, and a soft measurement unit; Filter, remove noise and normalize the parameters required by the dynamic soft measurement of the quality index; use the dynamic soft measurement model of the quality index of the blast furnace multicomponent molten iron to perform dynamic soft measurement of the quality index of the blast furnace multicomponent The parameters required for the dynamic soft measurement of the molten iron quality index are used as input, and the multivariate molten iron quality index of the blast furnace is output as the output, and the output self-feedback is adopted to dynamically and online recursively predict the multivariate molten iron quality index of the blast furnace. The invention considers the hysteresis characteristics of the blast furnace smelting process and the time series relationship between input and output variables, and utilizes the recursive subspace intelligent modeling technology to realize the dynamic online soft measurement of the multivariate molten iron quality indicators in the blast furnace smelting process.

Description

technical field [0001] The invention belongs to the technical field of automatic control of blast furnace smelting, and in particular relates to a soft measurement system and method for multi-element molten iron quality indicators of blast furnaces. Background technique [0002] Blast furnace ironmaking is a dynamic process of reducing iron from iron ore and other iron-containing compounds. In order to achieve high yield and low energy consumption in the blast furnace smelting process, real-time monitoring and effective control of the internal state of the blast furnace should be carried out. However, the internal smelting environment of the blast furnace is extremely harsh. The temperature in the most violently reactive area is as high as 2,000 degrees, and the pressure is as high as about 4 times the standard atmospheric pressure. Along with the multi-phase coexistence of solid, liquid, and gas, it is difficult to monitor the internal state of the blast furnace in real time...

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Problems solved by technology

[0006] The methods reported in the above-mentioned patents and the methods in other relevant documents are all soft-measurement methods for a single molten iron quality index, such as molten iron temperature, Si content, S content, etc., and a single molten iron quality index cannot fully reflect the complex internal conditions of the blast furnace. state, it is impossible to provide comprehensive guidance for on-site operators, and the practical application value is low

Moreover, the models established by the existing molten iron quality soft measurement methods are all time-invariant models, which are not suitable for the slow time-varying characteristics of the working conditions of ...

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