| 摘要 |
PURPOSE:To make start and end of furnace operation easy, and to improve gas recovery efficiency, by setting a by-path flue changeable to a suction exhauster side, and using changeably a normal-pressure operation method to introduce an evolved gas to an atmosphere release side and a pressure operation method to sent the gas to a gas recovery side. CONSTITUTION:The suction exhauster 6 is operated to sena an evolved gas to the flues 7, 8, 10 and 17, the gas is cooled by the gas cooler 3, exhausted through the dust collectors 4 and 5 to atmosphere (furnace opening is opened and normal-pressure operation is carried out). The furnace opening part of molten iron bath furnace is closed and sealed, and the exhauster 6 is stopped. Then, the pressure at the furnace opening part is raised, the evolved gas is sent through the flue 7 by the pressure to the flue 10. When this gas output pressure reaches a gas recovery pressure, it is recognized by the detector 24 to operate the actuator 18, the divergence of the dust collector 5 is regulated corresponding to the furnace opening pressure of the bath furnace, the evolved gas is transported to a gas holder and stored (space between furnace opening part and flue is closed, and pressure operation is carried out).
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