中间包钢水连续测温的新方法

New Approach to Continuous Temperature Measurement of Liquid Steel in CC Tundish

基于在线黑体空腔理论,提出了一种新型的钢水连续测温方法·针对在线黑体空腔不满足基尔霍夫理想黑体物理模型,具有'非密闭'和'不等温'的辐射特性,建立了在线黑体空腔有效发射率、积分发射率的计算模型,并应用于中间包钢水连续测温系统中·实践表明,该方法具有较高性能价格比,测量误差≤±3℃,测温管寿命可达20～40h,测温成本与现行的快速热电偶实际消耗相当或略低,同时低于铂铑热电偶连续测温,是取代现行钢水间断式测温的较好方法·

Based on the theory of blackbody cavity, a new approach to continuous measurement of liquid steel temperature is proposed. In view of that the on-line blackbody cavity cannot satisfy the physical model of Kirchhoffs ideal blackbody and is featured radiatively with non-airtight and non-isothermal,a model is developed to compute the effective and integral emissivites of on-line blackbody cavity and applied to measuring continuously the temperature of liquid steel in CC tundish. The test results showed the higher price performance of the new approach and its error ≤3 ℃, with the service life of up to 20～40 hours. Comparing the method with others in cost, it is equivalent to or little less than quick-thermocouple and less than Pt/Rh thermocouple for continuous measurement. It is available to use as a substitute for the conventional methods for intermittent measurement.