A direct reduction system for a direct reduction of iron oxides, comprising - a reactor having a reduction area and being adapted to be loaded from above with said iron oxides; - a treatment and feeding line for treating process gas, thus obtaining a reducing gas mixture, and for feeding said reducing gas mixture into the reduction area; - a recovery and treatment line for recovering and treating an exhausted gas exiting the reactor, communicating upstream with the reactor and downstream with said treatment and feeding line; wherein at least one bypass duct is provided, adapted to divert at least one portion of said reducing gas mixture from said treatment and feeding line to said recovery and treatment line; wherein there are provided - at least one first regulation valve for regulating the portion of the reducing gas mixture which, by means of said at least one bypass duct, reaches the recovery and treatment line; - at least one second regulation valve for regulating the passage of exhausted gas exiting the reactor along the recovery and treatment line; - at least one control device for controlling said at least one first regulation valve and said at least one second regulation valve; and wherein said control device is adapted to receive a first signal indicative of a discharge flow rate of DRI from the reactor and to produce a second signal for controlling the at least one first regulation valve and a third signal for controlling the least one second regulation valve. - a reactor having a reduction area and being adapted to be loaded from above with said iron oxides; - a treatment and feeding line for treating process gas, thus obtaining a reducing gas mixture, and for feeding said reducing gas mixture into the reduction area; - a recovery and treatment line for recovering and treating an exhausted gas exiting the reactor, communicating upstream with the reactor and downstream with said treatment and feeding line; wherein at least one bypass duct is provided, adapted to divert at least one portion of said reducing gas mixture from said treatment and feeding line to said recovery and treatment line; wherein there are provided - at least one first regulation valve for regulating the portion of the reducing gas mixture which, by means of said at least one bypass duct, reaches the recovery and treatment line; - at least one second regulation valve for regulating the passage of exhausted gas exiting the reactor along the recovery and treatment line; - at least one control device for controlling said at least one first regulation valve and said at least one second regulation valve; - at least one first regulation valve for regulating the portion of the reducing gas mixture which, by means of said at least one bypass duct, reaches the recovery and treatment line; - at least one second regulation valve for regulating the passage of exhausted gas exiting the reactor along the recovery and treatment line; - at least one control device for controlling said at least one first regulation valve and said at least one second regulation valve; and wherein said control device is adapted to receive a first signal indicative of a discharge flow rate of DRI from the reactor and to produce a second signal for controlling the at least one first regulation valve and a third signal for controlling the least one second regulation valve.