COOLING SYSTEM FOR FURNACE

PURPOSE: A shaft furnace cooling apparatus is provided to identify which cooling band is damaged by the colors of the cooling water discharged from a through hole, thereby easily locating a damaged cooling band. CONSTITUTION: A cooling apparatus comprises a first cooling band(1), a second cooling band(2), a first water supply pipe, a second water supply pipe, a first coloring supply unit(81), and a second coloring supply unit(83). The first and second cooling band includes multiple cooling plates and supplies the pigment to the first supply of the coloring parts in the first water pipe. The first coloring supply unit supplies coloring to the first water supply pipe. The second coloring supply unit supplies colors having a different color from the color of the first coloring supply unit to the second water supply pipe.