Transcription of Understand vacuum-system fundamentals - Graham
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Understand vacuum-system fundamentals - Graham
Understand vacuum - system fundamentalsProperly operating ejectors and condensers is important in maximizing vacuum tower gas-oil yieldG. R. MARTIN, PROCESS CONSULTING SERVICES, Grapevine, TexasJ. R. LINES, Graham MANUFACTURING CO., INC., Batavia, New YorkS. W. GOLDEN, Glitsch, Inc., Dallas, TexasCrude vacuum unit heavy vacuum gas-oil (HVGO) yield issignificantly impacted by ejector- system performance, espe-cially at conditions below 20 mmHg absolute pressure. A deepcutvacuum unit, to reliably meet the yields, calls for proper design ofall the major pieces of equipment. Understanding vacuum ejectorsystem impacts, plus minimizing their negative effects equalsmaximum gas yield. Ejector- system performance may be adverselyaffected by poor upstream process impacts of optimum ejector performance are more pro-nounced at low flash-zone pressures. Gas-oil yield improvementsfor small incremental pressure reductions are higher at 8 mmHgthan at 16 mmHg.
lb/hr motive steam = 892.4 C d D n 2 (Psia/Vg)0.5 where Cd = Nozzle discharge coefficient D=Nozzle throat diameter, in. Psia = Motive steam pressure at ejector, lb f /in2 V g = Motive steam specific volume, ft3/1b. Motive steam quality is important because moisture droplets affect the amount of steam passing through the nozzle.
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