Blast furnace top gas recycling process and corresponding recycling equipment

摘要

A process for recycling blast furnace gas is provided. At least one portion of the gases resulting from the blast furnace undergo a CO2 purification step to create a CO-rich gas which is reinjected at a first top injection point at a temperature between 700° C. and 1000° C. through a top injection line, and at a second bottom injection point at a temperature between 1000° C. and 1300° C. through a bottom injection line. The gases from the bottom and top injection lines are heated at a temperature between 1000° C. and 1300° C. A portion of the CO-rich gas exiting the purification step is directly introduced into the top injection line via a cold gas injection line to obtain a temperature between 700° C. and 1000° C. at the first top injection point. The gas that flows through the bottom and top injection points controlled upstream of the system of the heaters. A device is also provided.

主权项

1. A process for recycling blast furnace gas, the processing comprising:
subjecting at least one portion of gases resulting from the blast furnace to a CO2 purification so as to create a CO-rich gas which is reinjected at a first top injection point located above a 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 line, in which the gases from the bottom and top injection lines are heated with at least one heater from which the gases emerge at a temperature between 1000° C. and 1300° C.; directly introducing a portion of the CO-rich gas exiting the purification into the top injection line via a cold gas injection line in order to obtain a temperature between 700° C. and 1000° C. at the first top injection point; and controlling at least one gas flow through the bottom injection point and top injection point upstream of a system of heaters.