Blast furnace top gas recycling process and corresponding recycling equipment
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United States of America Patent
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Mar 31, 2015
Grant Date -
Apr 19, 2012
app pub date -
Mar 17, 2009
filing date -
Mar 17, 2009
priority date (Note) -
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Abstract
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.
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