基于红外测温原理的转炉下渣检测系统

根据转炉出钢过程中控制下渣量的需要，设计了基于红外测温原理的转炉出钢下渣检测系统:首先使用红外测温系统对出钢注流的温度进行测量，并根据钢水、钢渣在远红外波段红外辐射率具有较大差异这一特性对钢水、钢渣进行区分，实时计算含渣量；在不同的炼钢现场（不同的大气透过率、环境温度、出钢温度等），钢渣、钢水的辐射率是变化的，因此提出一种标定方法，在一定的使用环境下，对区分钢水、钢渣的温度阈值进行标定；提出一种快速寻找出钢注流边缘的方法，从而完成出钢注流跟踪，避免由于转炉角度变化（注流移动），造成无法计算含渣量的情况。现场的实验结果表明:该方法能够控制钢包中钢渣的含量，较好满足了钢水炉外精炼的要求。

Slag detection system based on infrared temperature measurement

According to the need of controlling the slag content in the process of converter tapping, a slag detection system based on the principle of infrared temperature measurement was designed. Firstly the temperature of pouring stream was measured using the infrared temperature measurement system. The molten steel and slag were distinguished according to their infrared emissivities that had big difference in far infrared band and the real-time amount of slag contained was calculated. In different steelmaking sites(different atmospheric transmittances, different ambient temperatures, different tap temperatures, etc), the infrared emissivities of the molten steel and slag were changed, therefore a calibration method of the temperature threshold that was used to distinguish the molten steel and slag in a certain environment was proposed. A method that could quickly find the edge of the pouring stream was applied to complete the tracking of pouring stream, which could avoid the amount of slag was incapable of being calculated due to the change of converter angle(moving of pouring stream). Experimental results show that this method controls the amount of slag in the steel ladle and meet the requirement of molten steel refining.