Operation of the Cooler Cooling furnace refers to the operation process in which the hot blast stove is cooled from the production hot state to normal temperature, and is an important link in the production of the hot blast stove. Different refractory materials and different shutdown methods apply different cooling furnace methods.Vacuum heat treatment process of steel bearing parts When the blast furnace is in normal production, there is a cooling furnace when the inner masonry of the hot blast stove needs to be overhauled in the hot blast stove group. Shougang's cooling furnace experience is as follows: 1) Set the No. 1 hot blast stove to be repaired. During the last air supply, reduce the temperature of the top of the furnace to 1000-1050 °C, then change the furnace, close the air mixing valve after changing the furnace, and use the No. 1 hot blast stove for air mixing Furnace, its cold air valve is used as air temperature control valve, and it is not allowed to be fully closed;Deformation and Improvement of Slicing Knife Vacuum Quenching 2) During the mixing process of No. 1 furnace, the other two hot blast furnaces take turns supplying air. After 3 cycles, the air temperature is lowered to 200°C lower than the normal air temperature (the blast furnace load is correspondingly reduced), and No. 1 continues to be used for mixed air;Vacuum Heat Treatment of 42CrMo Steel High Strength Bolts 3) When the temperature of No. 1 furnace top drops to 250℃, stop working as a mixed-air furnace, close its cold and hot air valves, open the waste air valve and flue valve, and then start the combustion-supporting fan to continue to force the furnace to cool; 4) After the dome temperature drops from 250°C to 70°C, stop the combustion-supporting fan and complete the cooling of the furnace.