Furnace is a kind of energy conversion equipment.The chemical energy, electric energy and heat energy of steam gas are imported to the furnace, then they are converted into energy steam, heating water or heat transfer fluid and explored.Pot originally means heating the container filled by water above fire.Furnace means the room where fuel is burning.Furnace consists of two segments, pot and furnace. Hot water and steam produced in furnace can supply heating to serve industrial and aggreculture production directly.It also can be converted into mechanical energy through steam power instrument, or convert the mechanical energy into electric energy by generator.