Rotary hearth furnace exhaust gas duct apparatus and method for operating same
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United States of America Patent
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Apr 12, 2016
Grant Date -
Jun 20, 2013
app pub date -
Sep 2, 2011
filing date -
Sep 2, 2010
priority date (Note) -
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Abstract
An exhaust gas duct apparatus for use in a rotary-hearth furnace for heating a starting material including a carbonaceous reducing material and an iron-oxide containing material to produce reduced iron or granular metallic iron. In an exhaust gas duct for use in the rotary-hearth furnace, a cooling part for cooling an exhaust gas discharged from the rotary-hearth furnace to solidify a metal salt in the exhaust gas, a collision part for allowing the exhaust gas just after being cooled to collide therewith to drop down the metal salt solidified, and a direction change duct for guiding the exhaust gas after being collided, in a direction other than a direction of dropping the metal salt, are arranged in this order in two stages.
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