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What is the best choice in power plant : using air ejector or using vacuum pump ?

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Question added by اشرف اسماعيل , Safety and Environment Unit Manager , SUDANESE THERMAL POWER GENERATION COMPANY
Date Posted: 2013/11/20
Sakthi Venkatesh Kumar Kalimuthu Chellamariappan
by Sakthi Venkatesh Kumar Kalimuthu Chellamariappan , Sr. Instrumentation Engineer , Kazmunai India Pvt. Ltd

For improving the turbine performance ejector is used, Two types is employed.

First is the "hogging ejector"  or "start-up ejector".  It is used to pull vacuum quickly on a process vessel. Once vacuum is attained, this ejector is shut off and taken off-line. Then the vacuum is maintained by the "holding ejector " system. The hogging  or start-up ejector is usually used in a batch process or on a steam turbine, an application where it is important to get the main vacuum system on-line quickly. Hogging ejectors are usually single-stage, but they have also been built as two- and even three-stage non-condensing systems.

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