基于电磁法的钢水液位检测

Molten steel level detection based on electromagnetic method

钢水液位检测与控制是连铸生产过程中的关键技术之一。目前,我国广泛采用射线式同位素Cs137钢水液位测量装置,但其具有放射性,对人有辐射性伤害。针对这一问题,基于电磁感应原理设计了安全、满足检测精度要求的电磁式钢水液位检测装置。首先,在电磁场有限元仿真软件中,采用控制变量法优化设计了由一个激励线圈、两个差分感应线圈构成的电磁式检测传感器。然后,研制了一台具有2支传感器的钢水液位检测仪表,把传感器反馈的感应电压信号经过分段线性插值等算法处理后转换为钢水液位测量值。试验结果表明,该检测装置可以测量强磁和弱磁材料,单支传感器量程为26mm,精度能达到1mm,响应速度为0.5s,满足钢水液位检测性能要求。

The detection and control of molten steel level is one of the key technologies in the continuous casting process.At present,the radioactive isotope Cs137 molten steel level measuring device is widely used in China,but it is radioactive and has radiation damage to humen health.In response to this problem,based on the principle of electromagnetic induction,the electromagnetic molten steel level detection device which was safe and met the requirements of detection accuracy was developed.First of all,in the finite element simulation software of electromagnetic field,the control variable method was used to optimize the design of electromagnetic detection sensor composed of an excitation coil and two differential induction coils.Then,a molten steel level detection instrument with two sensors was developed,and the induced voltage signal fed back by the sensor was converted into the measured value of molten steel level after the algorithm of piecewise linear interpolation.The experimental results showed that the molten steel level detection device can measure strong and weak magnetic materials.The range of a single sensor was 26 mm,the accuracy can reach 1 mm,and the response speed was 0.5 s,which met the requirements of molten steel level detection performance.