Online forecasting method of continuously cast bloom real-time temperature field based on infrared thermal imaging

Abstract

The invention provides an online forecasting method of a continuously cast bloom real-time temperature field based on infrared thermal imaging, relating to monitoring and analysis of surface temperature of a billet. The invention provides an online checking method for determining heat transfer coefficients in a secondary cooling zone and an air cooling zone to check the heat transfer coefficientsin the secondary cooling zone and the air cooling zone in real time; compared with the prior art, the method improves precision of forecasting the real time temperature field through sectional checking method of heat transfer coefficients, more precisely forecasts temperature field on the surface and at the interior of the casting blank and precisely reflects the solidification process of the casting blank; therefore, the method provides necessary data support for the precise and effective implementation of the casting technology of secondary cooling dynamical water distribution, solidification end electromagnetic agitation and solidification end dynamic pressure, and the like.

Description

technical field [0001] The invention relates to the monitoring and analysis of the surface temperature of a billet, in particular to an online prediction method for real-time temperature field of a continuous casting billet based on infrared thermal imaging. Background technique [0002] The continuous casting process is a solidification heat transfer process in which high-temperature molten steel is transformed into a solid state. Water is mostly used as a cooling medium in the solidification heat transfer process of the slab, that is, a solidification heat transfer process in which high-temperature molten steel is solidified into a slab through cooling water. . Therefore, the solidification and heat transfer process of the slab plays a vital role in the surface quality and internal quality of the slab surface cracks, internal cracks, bulging and so on. In order to effectively control the quality of the slab and improve economic benefits, it is necessary to accurately and ...

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Problems solved by technology

Patent CN1410189A provides a method for measuring the surface temperature of a slab based on a pyrometer, which can only provide a single-point measurement result of the surface temperature; patent CN1844409A proposes a temperature field based on an infrared image, but this method only involves blast furnace metallurgy The furnace throat temperature field of the process can only display the external surface temperature of the charge; the patent CN2188439Y provides an online measurement device for the internal temperature of the continuous casting slab, but this measurement method can only be used when the casting is nearing the end, and is subject to the casting tail. The influence of slab overcooling cannot truly reflect the internal temperature of the slab; the master’s degree thesis of Chongqing University in July 2008 (the influence of water mist medium on the surface temperature measurement of continuous casting slab and the research on temperature measurement method, written by Gao Wenxing) adopted monochrome and colorimetric thermometer to measure the temperature on the surface of the slab, and studied the influence of different factors on the temperature measurement accuracy. The above two methods also use single-point temperature measurement; "Steel" magazine, February 1998 (vol. 33 No. 2, pages 18-21, Liu Qingguo et al.) reported the use of a colorimetric thermometer to measure the surface temperature of the slab online, but this method can only measure the temperature of a single point

The traditional temperature measurement method can only guarantee the continuity of the temperature measurement data in time but not in space, so the accuracy of the temperature measurement data is not high

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