High temperature flue gas fluidized bed combustion furnace can supply heat for rotary type dryer, vertical dryer, hammer type dryer, indirect dryer, small slag micro-powder production line, wind sweep coal grinder, coal powder vertical mill, fertilizer granulation machine, etc. High temperature flue gas fluidized bed combustion furnace/boiler can be widely used in drying and roasting for industrial materials or products, such as slag, clay, coal slime, calcium carbide slag, compound fertilizer, industrial gypsum board, iron concentrate fine , sulfur concentrate, laterite ore, siderite, and zinc leaching residue.