Determination of ladle lining heat content with radiation thermometer

• Most steel plants are currently operating with 100% continuous casting, often in sequence. This gives an increased demand for accurate process control of both the steel temperature and the time schedule. A normal steel plant practice gives too large a difference from heat to heat regarding the steel temperature in the ladle and the tundish, often due to the varying heat content of the ladle lining. One common practice to obtain an accurate steel temperature control in the tundish is to build in temperature and time buffers in the ladle metallurgy schedule, resulting in increasing costs for the higher temperature in the furnace and lower productivity. The aim of this project has been to study the possibility of measuring the heat content of the ladle lining by a non-contact method. Plant trials have been carried out at a Swedish steel plant, where the heat content of the ladle lining was determined by measuring the lining time-temperature relation with a radiation thermometer. By using the measured heat content as the input in a simulation model, it has been possible to calculate the steel temperature lapse. The difference between the calculated and actual measured steel temperature has been acceptable, with a standard deviation of ±3.5°C. This shows that it is possible to use a non-contact temperature measurement in connection with a calculation model to predict accurately the steel temperature lapse in the ladle

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

Process Metallurgy

Processmetallurgi

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