Blow down gas flow rate control manner and its device null of the louver die cinder catcher in the exhaust gas

摘要

PURPOSE:To hold high dust collection efficiency stably hy detecting the pressure of gas by the pressure detector provided to the inlet of a gas cooler and controlling the flow rate control mechanism provided to the blow-down system of a louver type dust collector corresponding to the detected pressure. CONSTITUTION:The high temp. dust-containing gas generated in a converter 10 is guided to a gas cooler 11 to be cooled and subsequently guided to a louver type dust collector 13 to separate coarse particulate dust and further guided to a secondary dust collector 14 to store gas having high CO concn. in a gas holder 19. At this time, the pressure of the gas is detected by the pressure detector 27 provided to the inlet of the gas cooler 11 to be sent to an operator 30 and, on the basis of the detected pressure, the opening degree of the variable throat 14a of the secondary dust collector 14 and that of the flow rate control valve 25 of a blow-down pipe 23' are controlled.