In recent years,due to the strong demand for high quality and clean steel,converter steelmaking has been accelerated towards the development of large-scale,high-efficiency,clean and green.In order to meet the current development of smelting technology and improve the overall service life of converter refractories,the temperature and stress fields for the"turned brick type"refractory lining in the melting zone of conventional converter were sim-ulated and analyzed by the thermal-structural coupling module of ANSYS software.According to the calculation re-sults,the optimization scheme of furnace lining design was proposed and the scheme was verified by finite element analysis and industrialized application.The results show that refractory lining in melting zone of traditional convert-er has serious thermal stress concentration phenomenon in the first and second steering zones,which corresponds to the formation of thermal stress peak,the peak in the first steering zone is the largest,as high as 153.56 MPa,which is approximately more than 10 times for the magnesium-carbon brick inherent strength.Advanced structural elements such as"double circular masonry""surface-to-surface connection"and the design concept of"stress ab-sorption buffer layer"were innovatively adopted.The optimal design scheme of"DC-P"structure was put forward and implemented.When used the ANSYS method to analyze it again,the maximum thermal coupling stress on the working surface of refractory lining in the melting zone could be effectively reduced to below 8.5 MPa,and there were no thermal stress"double peaks"in the first and second steering zones,the expected effect had been achieved.After applying the"DC-P"structural design scheme to a 260 t converter in China,it is founded that the bottom cor-ner of the converter lining always maintains a smooth transition shape,and there is no"bottom corner pit"in the whole furnace service.Compared with the"turned brick type"furnace lining,the overall furnace age increases by 36％,the average refractory unit consumption decreases by 33％,which can meet the needs of high-quality clean steel smelting technology better.Therefore,the refractory lining structure design of"DC-P"in the melting zone for converter proposed in this study has good popularization and application foreground.
converterrefractorystructural designfinite element analysisthermal stress concentration
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