The Advanced Dehydrogenization Dynamic Control System of RH Degasser at Kashima Steel Works

摘要

1. The sequential hydrogen measurement system has been applied to Kashima No.3 RH degasser and actual dehydrogenization content during RH treatment has been found by the sequential system. 2. As a result of analyzing the actual dehydrogenization content during RH treatment under consideration of equilibrium hydrogen content, it is found that relative humidity has influence on the rate of dehydrogenization with the adoption of circulation gas flow rate and oxygen activity. Consequently, the rate of dehydrogenization is related with circulation gas flow rate, oxygen activity and relative humidity and estimated as an equation. 3. The advanced dehydrogenization dynamic control system has been developed with adopting the estimated dehydrogenization rate equation and sequential hydrogen measurement system. As a consequence of introduction of the dehydrogenization dynamic control system into Kashima No.3 RH degasser, dehydrogenization time is reduced by 1.7min. in actual operation.