Drum inner diameter is Ф1400mm, wall thickness is 40mm, and material is Q245R. Drum internal device is consisted by the cyclone separation device, the top shutters, dosing pipe, sewage tube, recycle tube, emergency water-discharge tube. Besides, the drum is also equipped with some accessories, just like the high, low-read water level gauge, the pressure meter, the safety valve, the air-discharging valve and the steam valve. 50mm below the drum central line is the normal water level; 75mm far from the normal water level is the boundary-beyond alarming line and 120mm far from the normal water level is the limit alarming line.