Engineering calculations for ejector stages is thoroughly discussed in Chapter 4. How ejector stages work is reviewed in Chapter 3. Chapter 2 discusses what an ejector is and how it works. Chapter 1 is a short overview on how to use the text. There are still many applications, however, such as those with large capacity requirements, where ejectors are the only equipment that can produce sufficient vacuum. With increasing emphasis on stricter pollution control, their use was curtailed. Steam jet ejectors were for many years the workhorse of the chemical process industries for producing vacuum.
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