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Chemical and Process Engineering Resources

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Category: Thermodynamics
Question: What is a steam jet ejector?
Keywords: steam,jet,ejectors,vacuum,systems,definition
Answer: R.M. Price describes steam ejectors as follows:Steam jet ejectors are often used to pull vacuum on surface condensers, evaporators, etc. A high pressure, motive, fluid (usually steam) enters the ejector chest through a nozzle and then expands. This converts its pressure energy to velocity. The increased velocity causes reduced pressure, which sucks in and entrains gas from the suction. The diffuser section then recompresses the mixed steam/gas stream to some intermediate pressure. The exhaust is then sent to a condenser which quickly condenses the steam at a low pressure and temperature so that the volume quickly decreases.
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