Afterheat refrigerating system for slag flushing water of blast furnace

The invention provides an afterheat refrigerating system for slag flushing water of a blast furnace. The system comprises a water pump, a blast furnace slag flushing water treating device, a blast furnace slag flushing water heat storing device and a hot water type lithium bromide absorbing type water chilling unit; the blast furnace slag flushing water treating device, the blast furnace slag flushing water heat storing device and the hot water type lithium bromide absorbing type water chilling unit are sequentially connected through pipelines; the blast furnace slag flushing water heat storing device is positioned above the hot water type lithium bromide absorbing type water chilling unit; the water inlet end of the water pump is connected with a hot water tank through the pipeline, and while the water outlet of the water pump is connected with the water inlet of the blast furnace slag flushing water treating device through the pipeline; the water outlet of the hot water type lithium bromide absorbing type water chilling unit is connected with a cold water tank. According to the system, the afterheat of the blast furnace slag flushing water is directly utilized to produce chilling water; the afterheat of the blast furnace slag flushing water can be recovered yearly.