Method for weighing molten iron in electric induction furnace online based on distributed parameter model

Abstract

The invention discloses a method for weighing the molten iron in an electric induction furnace online based on a distributed parameter model, including the following steps: analyzing the circuit structure and load characteristic of an electric induction furnace, and building an equivalent circuit model and a differential equation of the load part of the electric induction furnace; sampling input and output data of the electric induction furnace in the melting process, and carrying out system identification and circuit parameter estimation with use of the sampling data according to the differential equation of the load part of the electric induction furnace; and building a distribution relation model between the circuit parameters and the molten iron height and molten iron section diameter of the electric induction furnace, and identifying the weight of the molten iron online according to a molten iron weight calculation formula. The method of the invention does not require additional weighing sensor equipment. The hardware has a simple structure and high cost performance.

Description

technical field [0001] The invention relates to a method for weighing molten iron, in particular to an online weighing method for molten iron in an induction furnace based on a distribution parameter model. Background technique [0002] In the induction furnace melting process, many circuit parameters cannot be measured except voltage and current, so the performance of an induction furnace can only be described with a rough estimate. At the same time, due to the constraints of the high temperature environment, it is difficult to accurately measure the liquid level and weight of molten iron online, and can only be estimated and judged by experience. [0003] The Chinese patent with the publication number CN201310411239.3 discloses a method for automatic weighing of molten iron. According to the elliptical shape of the molten iron ladle, four stress points are selected to set up load cells to weigh the molten iron. [0004] The Chinese patent with the publication number CN201...

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Problems solved by technology

[0005] However, the existing technologies are all aimed at weighing molten iron in blast furnaces, and need to use weighing sensors, which cannot realize online weighing of molten iron, and do not involve the weighing of molten iron in induction furnaces. The weighing methods are different for different furnace types, which increases the measurement cost, and it is difficult to apply it to the weighing of molten iron in the induction furnace

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