Abstract
High-pressure motive steam passes through the nozzle throat, expands, and leaves it at a high velocity (which entrains the gas or vapor in the suction chamber) and enters the diffuser. In the diffuser, the velocity head is converted to pressure. See Figure 15.1. The entrained gas is thus compressed from the low absolute pressure at the suction to a higher pressure at the discharge. The ratio of discharge pressure over suction pressure (ratio of compression) is about 6 or 10 to 1, per stage. As with other types of gas compressors, the compression stages are operated in series to obtain a greater overall compression, or lower suction pressure.
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References
Dow Chemical Company, Steam Ejector Manual, private communication.
Ejector Guide Book, Worthington Corporation, Harrison, New Jersey, 1960, p. 4.
E. E. Ludwig, Applied Process Design for Chemical and Petrochemical Plants, Vol. 1, Gulf Publishing Co., Houston, Texas, 1964, pp. 182–214.
R. H. Perry, C. H. Chilton, and S. D. Kirkpatrick, Chemical Engineers Handbook, 4th ed., McGraw-Hill, New York, 1963, pp. 6-29–6-32.
D. H. Jackson, Selection and use of ejectors, Chem. Eng. Prog. 44, 347 (1948).
Selected Reading
Ejector Guide Book, Worthington Corporation, Harrison, N. H., 1975.
Frumerman, Steam jet ejectors, Chem. Eng. June (1956).
D. H. Jackson, Selection and use of ejectors, Chem. Eng. Prog. Vol. 44 (1948).
Ernest E. Ludwig, Applied Process Design for Chemical and Petrochemical Plants, Vol. 1, Gulf Publishing Co., Houston, Texas, 1964.
R. H. Perry and C. H. Chilton, Chemical Engineers Handbook, 5th ed., McGraw-Hill, New York, N.Y., 1974.
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© 1978 Plenum Press, New York
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Aerstin, F., Street, G. (1978). Steam Ejectors for Vacuum Service. In: Applied Chemical Process Design. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3976-2_16
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DOI: https://doi.org/10.1007/978-1-4613-3976-2_16
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