Method for measuring density and temperature of heat flux of hot side of crystallizer

Abstract

The invention relates to a method for measuring the density and temperature of heat flux of a hot side of a crystallizer, and belongs to the technical field of continuous casting. The method includes the steps of reasonably installing two thermal couplers in the continuous casting crystallizer to acquire temperature data, and then converting the acquired temperature data in the walls of the crystallizer into the density and temperature of heat flux of the hot side of the crystallizer through a two-dimensional heat transfer inverse problem. The method has high industrial application value, and the density and temperature of heat flux of the hot side of the crystallizer can be more accurately calculated.

Description

technical field [0001] The invention relates to a method for measuring heat flux density and temperature of a crystallizer hot surface, belonging to the technical field of continuous casting. Background technique [0002] The calculation of heat flux density and temperature on the hot surface of the mold has an important influence on the quality control of the slab and the selection of process parameters. At present, the methods for measuring the heat flux of the continuous casting mold are: 1. Direct method, assuming that the mold wall is one-dimensional heat transfer, two thermocouples with different depths are installed in the horizontal direction, and then the heat flux is equal to the thermal conductivity × (thermocouple temperature difference / thermocouple distance). This technology has an implicit condition, that is, the thermal diffusivity of the crystallizer is infinite; it cannot accurately calculate the heat flux and temperature of the hot surface of the crystalli...

AI Technical Summary

Problems solved by technology

This technology has an implicit condition, that is, the thermal diffusivity of the crystallizer is infinite; it cannot accurately calculate the heat flux and temperature of the hot surface of the crystallizer; especially the heat flux near the liquid surface of the crystallizer, and cannot obtain accurate heat flow of the crystallizer Density, temperature; at the same time, heat flux density and temperature are greatly affected by thermocouple measurement noise

2. Inverse algorithm: 1D inverse algorithm, assuming that the crystallizer wall is one-dimensional heat transfer, ignoring the heat transfer in the height direction cannot accurately calculate the heat flux near the liquid surface of the crystallizer, and the temperature change of the crystallizer wall cannot be obtained

[Pinheiro, C.A.M., I.V.Samarasekera, J.K.Brimacomb, and B.N.Walker. Ironmaking & Steelmaking 27(1)(2000):37-54.] established a 2D heat transfer inverse problem to convert the temperature of thermocouples in the mold wall to The heat flux density of the device, using the Tikhnov regular method to calculate the inverse problem, this method has the ability to resist the thermocouple measurement noise, but it is difficult to determine the regular term and regular parameters when using it

Some other scholars (at home and abroad) have established a 2D heat transfer inverse problem, which converts the measured temperature into the heat flux of the crystallizer, but uses Beck's sequential function specification method to ...

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