水雾对高温铸坯表面辐射测温影响的实验研究
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摘要
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-(a Q+b)h-cQ-d. The relationship between pressure and air pressure is ?T=kh-b_1.The parameters are determined through experiments. The research results can provide accurate temperature measurement for continuous casting process.
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-(a Q+b)h-cQ-d. The relationship between pressure and air pressure is ?T=kh-b_1.The parameters are determined through experiments. The research results can provide accurate temperature measurement for continuous casting process.
引文
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[2]陈登福,曾丁丁,孙跃,等.150 mm×150 mm方坯连铸高效化的二冷技术[J].特殊钢,2004(3):42.
[3]Hardin R A,Liu K,Beckermann C,et al.A transient simulation and dynamic spray cooling control model for continuous steel casting[J].Metallurgical&Materials Transactions B,2003,34(3):297.
[4]杜京义.一种消除铸坯表面水雾气对红外测温影响的方法[J].重型机械,1999,(2):4.
[5]王育欣,牛国新,姜国强.一种吹风引起铸坯温降对测量误差影响的新校正方法[J].装备制造技术,2008,(4):124.
[6]贺刚,邢跃,陈忠平.Raytek非接触式在线测温系统在热轧连铸坯测温中的应用[J].冶金自动化,2001,25(4):68.
[7]LIU Yu-ying,ZHANG Xin-xin.Influence of Participating Media on the Radiation Thermometry for Surface Temperature Measurement[J].Journal of Thermal Science and Technology,2005,14(4):368.
[8]刘玉英,张欣欣.基于辐射换热理论研究水雾对红外辐射测温仪的影响[J].红外技术,2008,30(10):602.
[9]欧阳奇.基于辐射图像的高炉回旋区温度场重构关键技术研究[D].重庆大学,2007.
[10]吴德建.在线红外三色辐射测温技术研究[J].宝钢技术,2000,(3):43.
[11]王重君,李双江,陈长芳,等.中厚板坯表面红外测温试验[J].河北冶金,2016(5):34.
[12]乔治.红外扫描测温装置在板坯连铸机二冷区的应用研究[J/OL].自动化仪表,2018(8):100.
[13]李丽,薛东妹,潘涛,等.加热温度对高硫连轧钢夹杂物化学冶金的影响[J].连铸,2018,42(31):43.