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Ejector Calculation Download Now SaveEjector Calculator Uploaded by vilaschinke123 5 5 upvotes 0 0 downvotes 5K views 6 pages Document Information click to expand document information Date uploaded Jan 05, 2011 Copyright Attribution Non-Commercial (BY-NC) Available Formats XLSX, PDF, TXT or read online from Scribd Share this document Share or Embed Document Sharing Options Share on Facebook, opens a new window Facebook Share on Twitter, opens a new window Twitter Share on LinkedIn, opens a new window LinkedIn Share with Email, opens mail client Email Copy Text Copy Link Did you find this document useful 5 5 upvotes, Mark this document as useful 0 0 downvotes, Mark this document as not useful Is this content inappropriate Report this Document Download Now save Save Ejector Calculator For Later 5K views 5 5 upvotes 0 0 downvotes Ejector Calculator Uploaded by vilaschinke123 Description: Full description save Save Ejector Calculator For Later 5 5 upvotes, Mark this document as useful 0 0 downvotes, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 6 Search inside document.Browse Books Site Directory Site Language: English Change Language English Change Language.Would anyone be able to help me out on this one please Thank you ). The question is what pressure can we regulate this steam to in order to still maintain the flow. We are passing the steam at some pressure (this is what is to be determined) through the eductor to induce the flow of a stack gas, which is at or near atmospheric pressure (may actually be a slight vacuum). The outlet of the eductor will have a stack gassteam mixture that will then be returned to the stack. This flow will serve as a fast loop that every so often an analyzer will pull a slip stream from to test. Any suggestions as to how to formulate a relation of motive stream to outlet pressure The eductor used for gases is basically a convergingdiverging nozzle from what I understand. The pressure of the motive stream is dropped, to increase its velocity. Also, any good sites that thoroughly explain steam usage in refineries I am looking for something that starts with the basics of steam. Theyre all in the same family, but theyre each a different beast. An eductor is a device intended to move high liquid-cut fluids. The throat has a very short entry transition and a straight section followed by a divergent section. An ejector is intended to move high gas-cut fluids and has a convergent section for an entry to the straight throat which is again followed by a divergent section. If you are trying to compress a gas then you dont want to use an eductor (the effeciencies are too low, Ive done it but it requires a lot of power fluid). For scoping evaluation, youll need something like twice the steam pressure as your exhaust pressure (i.e. For practical purposes, youll want to look at about 2 compression ratios (i.e., for the 20 psia exhaust youll only be able to pull the suction down to about 10 psia). Your steam demand (in mass flow rate terms) will be about twice your suction requirements (i.e., if you need to move 2,000 lbmhr of suction gas youll have to supply 4,000 lbmhr of steam). None of these rules of 2 are exact, but before you waste a bunch of time chasing a marginal project it is worthwhile to apply them to see if youre in the ballpark. Steam is a very good motive fluid, so youll be able to bump all of the ratios a bit in a good direction. But I would not design and manufacture one from that basis - rather purchase a proprietary unit. Say air at 14.5 psia 3. Discharge pressure. Say 15.5 psia That will enable any vendor to specify the ejector. If you post the details, I can give a rough estimate of steam useage. The ejector will do what it needs with the high pressure steam, you just provide the minimum pressure at the inlet. The motive media is ink which passes through a converging nozzle, more ink (with air mixed in it) is then sucked up through the suction line and passed to the discharge line.
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