A crucible furnace is one of the simplest smelting equipment, which is mainly used to melt non-ferrous metals with low melting points, such as copper, aluminum and their alloys. In this kind of furnace, the alloy is melted in the crucible, and the heat is transferred to the charge through the crucible, and the charge and the combustion product are not in direct contact, so the chemical composition of the alloy is almost not affected by the furnace gas, and the temperature of the alloy liquid is also relatively uniform, which is its main advantage. Its disadvantages are lower thermal efficiency, high fuel consumption, smaller crucible capacity, and poor labor conditions.