Continuous determination of bath carbon content on 150tBOF by off-gas analyzer

Zhigang Hu, Ping He, Mingxiang Tan, and Liu LiuCentral Iron & Steel Research Institute, Beijing 100081, ChinaThe Steel Works of Benxi Steel Plates Co. Ltd., Benxi 117100, China

摘 要：<正> The first imported off-gas analysis system on 150 t BOF at Benxi Plates Co. Ltd. is presented and the continuous determination of bath carbon content has been studied. The comparison between the whole-course carbon integral model and the end-point carbon prediction model has been made. The results show that the regular change of CO, CO2 and N2 content in the off-gas during blowing plays an important role in judging the smelting end-point of converter; the cubic curve fitting model has a higher hit rate over 95% for the heats whose end-point carbon content is lower than 0.10% with a precision of +0.02% and has a large error for the heats whose end-point carbon content is more than 0.15%.

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