Are You Playing Vacuum-System Roulette? Combining condensate drain lines always is a gamble

摘要

THE VACUUM ejector is the most common choice for evacuating process equipment and keeping it under vacuum.For cost reasons,most systems rely on steam as the motive fluid.Steam ejector systems include other components besides the ejectors;the discharge vapors,including the motive steam,go to condensers,with condensate paBing to a hot well to allow recovery for treating.Figure 1 shows a three-stage ejector system with condensers after each stage.This type of system routinely serves to provide vacuum down to a pressure of 3 or 4 mm Hg at the suction of the first stage.The hot well takes the condensate from all three stages and collects the water for subsequent treating as well as separating any light slop oil present.