水雾对高温铸坯表面辐射测温影响的实验研究

Experimental study on influence of water spray on radiative temperature measurement of slab surface

连铸二冷区大量水雾对铸坯表面辐射测温造成不可忽视的误差,为探明水雾对高温铸坯表面辐射测温的影响规律,设计了研究水雾对高温铸坯表面辐射测温误差影响的实验装置,并利用实验装置以水雾厚度、铸坯实际表面温度、水量、气压为影响因素研究了水雾对辐射测温误差影响的实验研究。研究表明,存在水雾时,双色辐射测温值比单色辐射测温更加准确,且其与表面实际温度、水量,水雾厚度的关系为T=T_双-(aQ+b)h-c Q-d,与气压关系为?T=kh-b_1,实验确定了各参数值,得出了根据双色辐射测温值计算铸坯表面实际温度的表达式以及实际表面温度、气压对测温误差影响的关系,研究结果希望能为连铸过程提供准确测温的方法。

A large amount of water spray can cause error in radiation temperature measurement of slab surface in continuous casting secondary cooling zone. In order to find out the influence of water spray on the radiation temperature measurement of high temperature slab,in this paper an experimental device was designed to study the influence of water spray on the radiation temperature measurement error of high temperature slab. Experimental study of the influence of water spray on the radiation temperature measurement error is carried out by using the experimental device. The study shows that when the water spray exists,the two-color radiation temperature measurement is more accurate than the monochromatic radiation temperature measurement. Its relationship with the actual temperature,water volume and thickness of water mist is T=T双-(aQ+b)h-cQ-d. The relationship between pressure and air pressure is △T=kh-b1.The parameters are determined through experiments. The research results can provide accurate temperature measurement for continuous casting process.