具有快速响应特性的黑体空腔式钢水温度连续测量传感器

项目名称： 具有快速响应特性的黑体空腔式钢水温度连续测量传感器

项目编号： No.61473075

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 自动化技术、计算机技术

项目作者： 梅国晖

作者单位： 东北大学

项目金额： 82万元

中文摘要： 黑体空腔测温方法解决了钢水温度连续测量这一冶金检测领域的世界难题，并已在国外15家、国内58家钢铁企业应用。现有传感器最大问题是响应滞后达6～8min，动态特性差，无法实现钢水温度全过程连续实时监测。其根本原因是传感器采用大尺寸-厚壁-双层结构与高热阻Al2O3-C材料。 为此本项目提出基于结构与材料的新型传感器设计思想，即小型-薄壁-单层金属陶瓷材质的黑体空腔传感器。研究其技术性能的实现方法，包括：（1）基于传热与抗侵蚀需求优化腔体壁厚和成分，协调解决响应速度与寿命问题，并与Al2O3-C复合降低成本。（2）建立新型腔体的有效发射率计算模型，研究测温精度问题，设计小型化腔体。（3）建立微正压气体作用下传感器内流场-温场-浓度场耦合模型，研究解决单层结构引起的烟气干扰问题，保证测温稳定性。目标是将传感器响应时间缩短至30s内，根本改变黑体空腔钢水连续测温传感器的动态响应特性。

中文关键词： 快速响应；黑体空腔；钢水温度；连续测量；传感器技术

英文摘要： Temperature measuring method of blackbody cavity solves a worldwide problem in metallurgical measurement field that is temperature continuous measurement of molten steel. It has been applied in 15 and 58 steel companies in foreign and domestic respectively. The biggest problem of the existing sensor is the response lag of 6~8 min, leading to the poor dynamic nature, which results in that it cannot achieve continuous real time monitoring of molten steel temperature in overall process. Root causes are that the sensor adopts the big size - thick wall - double layer structure and Al2O3-C material with high thermal resistance. Therefore, this project puts forward a design philosophy of the new sensor that is a blackbody cavity sensor with small size - thin wall - single layer structure and cermet material. Implementation methods for technical performances of the sensor are investigated, including the following contents. (1) Based on the requirement of heat transfer and corrosion resistance, the wall thickness and components of this cavity are optimized, which coordinately solves the problem between response speed and lifetime, compounding with the Al2O3-C material for reducing the cost. (2) The work establishes a model for calculating the effective emissivity of the new cavity, studying the problem of temperature measurement precision, which is used to design the miniature cavity. (3) The coupling model of the temperature field - flow field - concentration field inside the sensor is established under the effect of micro-positive pressure gas, which is studied to solve the fume disturbance problem caused by the single-layer structure, ensuring the stability of temperature measurement. The aim of this work is to shorten the response time of the sensor to less than 30 s, radically altering the dynamic response characteristic of the blackbody cavity sensor for measuring the molten steel temperature continuously.

英文关键词： Fast response;Blackbody cavity;Molten steel temperaure;Continuous measurement;Sensor technology