Method for measuring surface temperature of high-temperature casting billet within water fog medium

Abstract

The present invention discloses a method for measuring the surface temperature of a high-temperature casting blank in water-fog medium; the water-fog concentration of the surface of the high-temperature casting blank is measured and transmitted to a remote computer through an air water-fog concentration sensor; the attenuation coefficient K lambda of water-fog medium to radiant energy in the water-fog concentration is gained by the remote computer through the relation curve between the attenuation coefficients of the water-fog medium and the radiant energy; temperature data tested by a thermodetector are modified by the attenuation coefficient K lambda and the emissivity of filam on the surface of the casting blank and the real temperature of the surface of the casting blank in the water-fog medium can be measured in real-time; the gain of accurate temperature has an important support on the application of continuous casting front-edge technology such as electromagnetic mixing, secondary cooling dynamic control and so on in dynamic slight press and has very important significance on improving the quality of casting blank and the whole level of continuous casting.

Description

technical field [0001] The invention relates to a temperature measuring method, specifically a method for measuring the surface temperature of a high-temperature slab under a water mist medium, which is mainly used for online measurement of the surface temperature of the slab in the secondary cooling process of continuous casting of steel, and is very important for realizing continuous casting secondary cooling. The dynamic control of the secondary cooling, the dynamic soft reduction of the secondary cooling, and electromagnetic stirring are of great significance to improve the quality of the slab. Background technique [0002] In recent years, my country's iron and steel industry has developed very rapidly, and its output of iron and steel products has ranked first in the world for ten consecutive years. my country's steel continuous casting technology has also been greatly developed. At present, almost all steel castings can realize continuous casting of steel. The continu...

AI Technical Summary

Problems solved by technology

The main manifestations of the impact of secondary cooling on the quality of the slab are: (1) Uneven cooling will cause the temperature of the slab shell to rise too fast and too high, and the slab is prone to cracks or subcutaneous cracks; When the billet is straightened, the surface temperature is too low (such as less than 900°C), and transverse cracks on the surface are likely to occur. At the same time, if the cooling intensity is too high, the columnar crystals will develop and easily form transgranular or bridging phenomena, which will make the center loose and segregate. (3) Cooling intensity Insufficient, the straightening of the slab with a liquid core is prone to straightening cracks; (4) The surface temperature of the slab in the secondary cooling zone is too high, and the slab is prone to bulge deformation and aggravates the central segregation

The disadvantages of this patent are: 1. In the secondary cooling section, due to the rapid evaporation of the cooling water sprayed on the surface of the high-temperature billet, a high-temperature and high-humidity water mist medium is formed around the billet, and the water mist medium has a large amount of radiation energy. Absorption, which makes a considerable deviation in the test results of the non-contact temperature measuring instrument based on the theory of thermal radiation and the photoelectric effect;

Its disadvantages are: 1. This patent only measures the temperature in the straightening zone, and does not involve the complicated secondary cooling zone

However, the current status of continuous casting technology is that there is no mature measurement technology for the surface temperature of the slab (this is also one of the key issues restricting the development of continuous casting technology)

Especially for the measurement of the surface temperature of the slab in the water mist cooling section, it is difficult to obtain the real surface temperature of the slab due to the existence of the water mist medium, whether it is a contact method or a non-contact method.

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