Boiler steam drum is a cylindrical pressure vessel of natural circulation water-tube boiler. A boiler may have different numbers of drum: single, double (bi drum boiler) or three. Steam drum provides a storage for water/steam at the upper end of water wall. Moreover, it plays as phase separator for mixed water/steam. Steam quality is improved to the highest level by process like chemical dosing, continuous blowdown, demisting, etc.
A steam drum has quite complex structures inside. See as below pictures.
It should have the following components like:
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