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The body of the fluidized bed furnace is a steel shell lined with thermal insulation bricks and a refractory brick structure. The fluidized bed furnace is divided into two parts: the furnace chamber and the air chamber by the gas distribution plate. Air caps with lateral openings are regularly arranged on the gas distribution plate, and above the distribution plate is a hearth poured with refractory concrete. After the first boiling furnace was built in my country in the 1950s, all domestic ore-based sulphuric acid and sulfuric acid companies and some smelting flue gas sulphuric acid companies have adopted the technology of fluidized roasting to produce sulfur dioxide gas.