Spray-Tray
Deaerator
Ecodyne's Spray-Tray Deaerator incorporates many exclusive design features that assure efficient and complete deaeration while at the same time offering rugged, corrosion-free construction.
Self-adjusting spring-loaded spray valves provide a uniform spray pattern over varying loads.
Increased spray distance ensures maximum heating and deaeration in the first stage.
Upward flow of steam counter to the downward flow of water provides final contact of the deaerated water with the purest and hottest steam.
Stainless steel tray enclosure and shroud ensures that non-condensable gases do not contact the carbon steel shell.
Liberally sized equalizers pass flashing steam between heater and storage vessels under upset conditions.
Optimum space below the tray stack provides reduced steam velocities and an even distribution.
All of these special design features combine to produce a deaerated feedwater having a guaranteed oxygen content of 0.005 mL/L or less.
Cold condensate and/or make-up enters the first stage of the deaerator through specially designed stainless steel spray valves that discharge the water in thin films into the steam space. The water is heated to within 2º F of the steam temperature and more than 95% of the non-condensable gases are removed.
In the second stage, the water sprays onto a series of distributing troughs and in turn spills uniformly on the trays beneath. The water then cascades down through the trays in the thin uniform films, countercurrent to the steam. Fresh gas-free steam enters the tray stack from the bottom and flows upwards scrubbing out the last of the residual oxygen and carbon dioxide. The deaerated water flows from the lowest trays to the storage tank and is available as boiler feedwater at the temperature corresponding to the steam pressure in the deaerator.
The steam
flows up through the tray stack to the first stage section carrying with
it the non-condensable gases. These gases pass up to the vent condenser
where most of the steam is condensed and falls back to mix with the incoming
sprayed water. The non-condensable gases and a minimum amount of steam
are vented to the atmosphere.
Copyright 2001 Ecodyne Limited
