C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
C21B 5/06 (2006.01)
Patent
CA 2755160
The invention mainly relates to a method for recirculating gas from a blast furnace in which at least part of the gases from the blast furnace are subjected to a CO2 purification step so as to create a gas that is rich in CO, which is then reinjected, at a first top injection point located above the base of the blast furnace and at a temperature of between 700 and 1000°C, through a top injection line, and through a second bottom injection point at the base of the blast furnace at a temperature of between 1000°C and 1300°C through a bottom injection line, wherein the gases from the top and bottom injection lines are heated with reheaters from which gases are discharged at a temperature of between 1000°C and 1300°C. The method of the invention is essentially characterized in that part of the CO-rich gas (18) being discharged from the purification step is directly injected into the top injection line (21) via a cold gas injection line (35) so as to result in a temperature of between 700 and 1000°C at the first top injection point (20), and in that the gas flow control in the bottom (22) and top (20) injection points takes place upstream from the reheater system (30,33; 45). The invention also relates to a device for implementing the abovementioned method.
The invention mainly relates to a process for recycling blast furnace gas in which at least one portion of the gases resuiting from the blast furnace undergo a CO2 purification step so as to create a CO-rich gas which is reinjected at a first top injection point located above the base of the blast furnace at a temperature between 700°C and 1000°C through a top injection line, and at a second bottom injection point at the base of the blast furnace at a temperature between 1000°C and 1300°C through a bottom injection tine, in which the gases from the bottom and top injection lines are heated by means of heaters from which the gases emerge at a temperature between 1000°C and 1300°C. The process of the invention is essentially characterized in that a portion of the CO-rich gas (18) exiting the purification step is directly introduced into the top injection line (21) via a cold gas injection line (35) in order to obtain a temperature between 700°C and 1000°C at the first top injection point (20), and in that the gas flows through the bottom injection point (22) and top injection point (20) are controlled upstream of the system of heaters (30,33; 45). The invention also relates to a device that implements the aforementioned process.
Borlee Jean
Didelon Fernand
Gillion Christian
Rachenne Yves
Sert Dominique
Arcelormittal Investigacion Y. Desarrollo S.l.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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