Electromotive force method for measuring liquid level in a container
GE Yao1,2, LI Meng1,2, WEI Han1,2, BI Chuan-guang3, LU Kai-cheng3, YU Yao-wei1,2
1. State Key Laboratory of Advanced Special Steel, Shanghai 200072, China; 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 3. Technology Center, Shanghai Meishan Iron and Steel Co., Ltd., Baosteel, Nanjing 210039, Jiangsu, China
Abstract：Developments of blast furnace on a huge scale, longevity, and high efficiency, are the main trend of ironmaking. However, the hearth is the key section affecting the longevity of the blast furnace. In order to stably monitor of the internal conditions of the hearth in a long operation, metallurgical researchers have tried many different methods, such as thermocouple temperature measurement, cooling wall water temperature monitoring method, ultrasonic nondestructive testing technology, etc. But the above methods have various disadvantages. According to structural characteristics of blast furnace hearth, an experimental device and its EMF (electromotive force) measurement system were designed in a laboratory scale. The relationship of EMF signal and the liquid level, temperature, sensing material, and other parameters was obtained in laboratory experiments. Furthermore, the relationship between EMF signal and liquid level was validated by an on-site torpedo tank experiment in a steel plant. Among the six signal wires, molybdenum and silver coating with copper were both suitable for the signal wire.
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GE Yao, LI Meng, WEI Han, BI Chuan-guang, LU Kai-cheng, YU Yao-wei. Electromotive force method for measuring liquid level in a container[J]. China Metallurgy, 2020, 30(2): 6-12.
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