Investigation of the Overall Efficiency of Steam Jet Ejector over a Range of Working Conditions

Banipal Nanno Yaqob, Hindren Saber


A common use of steam ejector is a simple vacuum pumping. It has been shown many advantages, primarily the ejector is inexpensive, small, no moving parts to go wrong, and also the equipment has shown significant cost reduction in the  operating stage over the mechanical pumps when the exhaust steam be put to an effective use. The present work addresses with the development of a steam jet ejector by studying the effect of nozzle geometry on the efficiency and performance of steam jet ejector. The main objective of this study is to assess the efficiency of steam ejector as pump and as feed heater with variable pressures and temperatures for different nozzle diameters used (2, 3, 4, 5, 6 mm). The system that has been built in the present work consists of boiler, feed water tank with feed pump, suction and delivery tank, and ejector. The results show that the efficiency of ejector as pump will increase, while the efficiency as a feed water heater decreases if the steam mass flow rate or steam pressureincreases. Also, the ejector efficiency will rise up for smaller nozzle inlet diameter, and the best performance was obtained at 4.5 bar steam pressure.


Steam ejector; Ejector efficiency; Nozzle geometry; Entrainment ratio

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