Application of Offgas Analysis on Predicting Carbon Content at End Point During Steelmaking Process
Using gas analysis to predict the carbon content at the end point is a new technology within steelmaking. The offgas data of a 100 ton BOF during steelmaking were analysed. The changing rules of the CO, CO2 and O2 volume fractions in the offgas played an important role in judging the status of decarburization in the converter during steelmaking. The carbon deposition reaction error, the CO2 dissolution in the west dedusting and the added CO2 from air into offgas had little influence on the predicted carbon content. The carbon integral model had serious errors regarding the predicted results. A new model based on the correlation between the volume fraction of CO and the carbon content in converter was built to predict the carbon content near the end point. The hit rate of the carbon prediction model was 95.79% for the end point carbon content ≤0.088% with a precision of ±0.03%.
KeywordsCarbon content Prediction CO Decarburization
This work was supported by the National Natural Science Foundation of China under Grant 51474023.
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