Rotary kiln is a kind of thermal equipment calcines lump, bulk and slurry materials. It is widely used in cement amp construction, non-ferrous metals, lime, ferrous metals, refractory materials, industrial chemicals, paper making industries etc. Rotary kiln refers to rotary calcining kiln ,mainly used for calcining calcium aluminate, limestone ... Rotary Kilns has been widely used for processing minerals, producing cement, calcining petroleum cokes, or drying biomass and wastes. Most of rotary kilns consume energy intensively. Therefore it is desired to assess the thermal losses from the kiln surface and find a way to reduce the energy losses.