Abstract: Technical sector: Incinerator unit of average capacity having a rotary grate for household refuse and industrial waste. Main technical characteristic of the invention: The incinerator is formed of a stationary casing and a metallic rotary grate of frusto-conical configuration made of juxtaposed cylindrical rings of decreasing diameters, formed of plane or curved members which may be modular plates identical for the entire grate. The incinerator has a pre-drying chamber. The ash pit serves as a basis for the entire unit. Main applications of the invention: Basic members of mobile, removable or stationary incinerator units and of incinerator plants for household refuse and industrial waste.