Patent ID: 6079372
Filing Date: 2000-06-27
Classification: B01D

Abstract:
A boiler feedwater system having triple-effect deaeration comprising an elongated feedwater receiver having an internal chamber with opposite end portions for storing a supply of deaerated boiler water in a bottom portion of the chamber and having a gas space in a top portion of the chamber;a component deaerator unit mounted above the feedwater receiver, the deaerator unit having an internal chamber with an upper dome portion and a lower elongated portion, the upper dome portion having a spray nozzle for spray water and a constricted vent above the spray nozzle for releasing noncondensible gases to the atmosphere, and the lower elongated portion having at least one screen tray arranged in the path of spray water, the elongated portion of the chamber having a central part and opposite end parts with a header mounted proximate each end part separating the end parts from the central part, the header having a passage under the header through which the end parts communicate with the central part;two steam delivery conduits each having a first end connected to one of the end parts of the deaerator unit chamber, a second end connected to one of the end portions of the receiver chamber, wherein the two steam delivery conduits deliver steam from opposite end portions of the receiver chamber to opposite end parts of the deaerator unit chamber;a spray water return conduit having a first end connected to the deaerator unit with an end opening located under the screen tray, and a second end connected to the receiver,a water collection column in the receiver rising in the bottom portion of the chamber and terminating in the upper portion of the chamber, wherein the second end of the spray water return conduit has an end opening in the water collection column; and,a steam supply conduit connected to a steam supply having a steam discharge end in the water collection column, wherein spray water collected in the collection column is mixed with steam an discharged into the top portion of the receiver chamber before commingling with the supply of deaerated boiler water.