2) The restraint of SiO gas formation around the raceway by the lower theoretical flame temperature (TFT8)).4) In order to achieve these ideas smoothly, the following points were put into practice at No. 5 BF: When the HHL is reduced, the tapping temperature increases from TB to TB/ (TA-To~TB'). At this point, water injection is increased to obtain the constant tapping temperature (T1~)' Water injection results in lower temperature (To!)

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