To provide an exhaust gas treatment method for a rotary hearth furnace, increasing an exhaust gas flow velocity in comparison with a conventional one, and suppressing attachment of dense solid materials to a duct even when the exhaust gas flow velocity is increased.
Provided is the exhaust gas treatment method of the rotary hearth furnace which is connected with a cooling device 5 for cooling an exhaust gas through a first exhaust gas duct 2 directly connected with an exhaust gas discharge port of the rotary hearth furnace 1 manufacturing reduced iron by heating reduction, and which is also connected with a secondary dust collector 8 through a second exhaust gas duct 7 in a latter part of the cooling device 5. An upstream side of the first exhaust gas duct 2 is a horizontal duct 3 horizontally disposed to the rotary hearth furnace 1, its downstream side is connected with the cooling device 5 as a vertical duct 4 vertically disposed, the exhaust gas flow velocity in the first exhaust gas duct is 9 m/second to 17 m/second, an upstream side of the second exhaust gas duct 7 is inclined upward, and its downstream side is inclined downward and connected with the secondary dust collector 8, and the exhaust gas flow velocity in the second exhaust gas duct is 15 m/second to 23 m/second.
COPYRIGHT: (C)2010,JPO&INPIT
Toshitaka Nakayama
Hiroaki Nakano
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Takato Tsutsumi