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摘要
Response lag is an outstanding problem of the traditional blackbody cavity sensor for continuously measuring the molten steel temperature, which is due to the thick-walled structure of the sensor, caused by the limitation of the sensor's Al2O3-C material in harsh environment. Thus, a fast response sensor with a thin-walled temperature measuring unit of blackbody cavity has been developed. A new sensor material of Mo-W-ZrO2 cermet that had a small corrosion rate of about 0.05 mm/h was developed for making the thin-walled sensor with a thickness of 3 mm, while the thickness of the traditional sensor was 20-30 mm. The temperature measuring unit of the cermet tube was supported by an Al2O3-C unit. In addition, the structure of the fast sensor was designed to form an online blackbody cavity approximately for a high accuracy (measurement error <= 3 degrees C) as the sensor was dipped into molten steel, the length/radius ratio of the temperature measuring unit of the cermet tube should reach 12. Industrial test showed that the fast sensor improved the response speed significantly from 5-6 min to about 55 s. It was helpful to solve the problem for continuously measuring the molten steel temperature of these fields that needed a fast response.
- 出版日期2018
- 单位东北大学
