Method for determining interface heat exchange coefficient of large-sized steel ingot

Abstract

The invention relates to a method for determining an interface heat exchange coefficient of a large-sized steel ingot. The method comprises the following steps of: 1) simplifying a contact interface between the steel ingot and an ingot mould into a plurality of test subsections, determining a plurality of test points in each subsection, setting a sensor on each test point, connecting the sensors to a data acquisition system together through respective leads, and connecting an interface heat exchange coefficient inverse calculation system at the output end of the data acquisition system; 2) when molten steel is solidified to form the steel ingot, acquiring temperature or heat flux information during molten steel solidification and transmitting the acquired signals to the data acquisition system through the sensors; 3) after the molten steel is fully solidified into the steel ingot, reading the data of each test point through the data acquisition system, acquiring the actually measured temperature or heat flux information of each test point along with time change, and importing the data and the information into the interface heat exchange coefficient inverse calculation system between the steel ingot and the ingot mould; and 4) solving the interface heat exchange coefficient between the steel ingot and the ingot mould by inverse calculation of the interface heat exchange coefficient inverse calculation system.

Description

technical field [0001] The invention relates to a method for determining the heat transfer coefficient, in particular to a method for determining the interface heat transfer coefficient of a large steel ingot. Background technique [0002] At present, with the enlargement of major equipment in industrial fields such as electric power, petrochemical, metallurgy, and shipbuilding, higher and higher requirements are put forward for large steel ingots. For example, 600-ton steel ingots are required for the manufacture of conventional island low-voltage integral rotors for million-kilowatt nuclear power units. Numerical simulation technology is playing an increasingly important role in the trial production of large steel ingots. The interface heat transfer behavior between the ingot and the ingot mold determines the solidification mode and solidification time of the ingot, and affects the shrinkage cavity, porosity, segregation, microstructure and properties of the ingot to a la...

AI Technical Summary

Problems solved by technology

These complex factors make it difficult to determine the interface heat transfer coefficient between the ingot and the ingot mold

In actual calculation, a guess value or empirical formula is usually used to determine the interface heat transfer coefficient between the ingot and the ingot mold, but the calculation results of these guess values ​​or empirical formula have very large errors

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