PURPOSE: To prevent high-temperature gas from being cooled by flushing water and reduce the pressure loss thereof by a method wherin dust in the blast furnace gas is removed by a multicyclone and sluice valves are provided at the inlets and outlets of each cyclones respectively to control the opening and closing thereof.
CONSTITUTION: The dust in the dust including waste gas (g), discharged from the blast furnace 1, is removed primarily by a dust catcher 2, thereafter, it is removed secondarily by plurality of cyclones 3, 3' ...3n arranged is parallel. A gas flow sensor 11 is provided in the main pipe 10 immediately after the blast furnace 1 while the sluice valves 13W13n, 14W14n are provided at the inlets and outlets of respective cylones 3W3n respectively. The flow amount of the gas g, discharged from the blast furnace 1, is detected by the sensor 11 and the analog signal (i) thereof is inputted into a controller 12. Pulse signals 0, 0' are outputted from the controller 12 to open or close the inlet sluice valves 13W13n and the outlet sluice valves 14W14n respectively.
TSUBOI TOSHIO
YAMAMOTO ISAMU
FUCHIGAMI TERUO
NIPPON STEEL CORP
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