The invention provides a method and a device for collecting the steam of flushing
cinder and the afterheat of hot water in an iron-making
blast furnace, which belong to the technical field of afterheat
recovery. The method comprises the following steps of: delivering the filtered
slag quenching water from a conventional
blast furnace slag processing system to a circulating pre-heater to heat a working medium, allowing the
slag quenching water at a lower temperature from circulating pre-heater to return to the
blast furnace to flush slag; introducing the working medium heated by the pre-heater into a circulating
evaporator in which the working medium absorbs the heat released in the
condensation process of the flushing
cinder steam and evaporates and allowing the vaporized steam to drive a
steam turbine so as to drive a generator to generate power; and condensing the working medium departing from the
steam turbine into liquid, returning the liquid to the circulating pre-heater and
evaporator and recycling the liquid by repeated heating and
vaporization. The device comprises a flushing
cinder steam heat-exchange loop, a slag
quenching water heat-exchange circulation loop and a working medium circulation loop. The method and the device have the advantages of maximizing the cyclic utilization of the flushing quenching heat and the
water source, reducing the
pollution of the flushing cinder steam to the environment and recycling the energy sources and the natural resources.