The boiler adopts single drum (10HAD10AC001) with Φ1775mm ID, 185mm wall thickness and 29930mm length, the drum head thickness is 170mm. Both the drum and its spherical heads are made of SA-299 plate. In order to get the steam and water separated efficiently while the boiler load is varied significantly, 232 cyclone steam separators with Φ292mm are equipped and arranged in three rows along the drum length, it could minimize the fluctuation of the water level. Two stage louver type separators will be installed to get 99% of steam quality before entering the superheater. The primary stage separator is installed slantwise at the upper part of cyclone; the secondary stage separator is installed on the top of drum. A big jacket inside of the drum keeps equal temperature distribution for the sub cooled water from drum wall and the mixture interlayer of the water and steam, this could also get benefit to reduce the drum metal temperature difference and improve the flexibility, safety and reliability during the operation. There is a large size downcomers with Φ558.8X50 under the each end of drum head (10HAD11AC002, 005), and two downcomers with Φ660.4X60 under the drum body (10HAD11AC003, 004). To avoid vortex and get steam free saturated water, a vortex inhibitor eliminator is installed at the each entrance of downcomers.
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