Augmentation of the quantity of injected carbon consumed at tuyeres of a blast furnace using an external reactor to heat the carbon and increase dwell time in the turbulent zone of the furnace

摘要

Augmentation of the quantity of carbon (4) consumed at the tuyeres (2) of a shaft furnace (1), preferably a blast furnace in which a part of the carbon gasification reactions, that is to say the cracking and partial oxidation reactions of certain volatile components, as well as a partial gasification of the formed semi-coke, is effected outside the furnace in an adequately pressurized reactor (11). Due to the heat discharged by the carbon oxidation reactions, the mixture of semi-coke and gas is carried to a temperature of between 900 and 1300 [deg] C. A more significant part of the residence time of the particles in the turbulent zone is devoted to the phenomenon of semi-coke gasification. An independent claim is also included for a device for putting this method into service and comprising a pressurized reactor equipped with a natural gas burner and connected to the furnace tuyeres.