Steelmaking waste heat recovery apparatus according to one aspect, the steelmaking furnace; A gas pipe connected to the steelmaking furnace through which the converter gas (LDG) generated in the steelmaking furnace flows; And a heat storage unit connected to the gas pipe so that the converter gas (LDG) can flow in, and to store sensible heat of the converter gas (LDG) during the steelmaking operation section and to produce steam using the heat accumulated during the non-operation section.
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