The issue of vacuum extraction under reduced pressure – how to create a vacuum? Have you seen this type of setup before?
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Our factory is a newly built one; the third stage of the pressure reduction and vacuum extraction system consists of water ring vacuum pumps, the second stage uses steam ejectors, and there is also a set of boosters for pressure reduction. May I ask what the correct procedure is? Is it possible to start the secondary steam ejector directly without using a water ring pump, and then activate the booster? Our vacuum level requirements are not high.
Is it not necessary to use a water ring pump? As long as the process remains unobstructed and there is no pressure buildup on the oil and gas side, it should work fine; this would result in a two-stage vacuum process. In the case of dry distillation with two stages, the vacuum level should be considerably lower.
For the third-stage water ring pump, rotary vane vacuum pumps are used in both the second and first stages, which yields very good results
The final stage should be a structure with a water ring pump and a steam ejector connected in parallel, right?
It can be used directly; there’s no problem with that. If a three-stage vacuum pump is available, then it needs to be started from the third stage!
When starting, drive from back to front; when stopping, stop from front to back!
That is, first start the water ring vacuum pump, then the secondary evacuator, and finally the steam booster. Can we first start the secondary vacuum pump at the boiling water ring pump? Does a steam evacuator also require back pressure?
This post was last edited by dongliangsir on 2015-10-21 at 12:10. Steam evacuators must be designed to start under pressure; otherwise, they will not function at all, and in some cases backflow may occur, resulting in a waste of steam. The second stage generally starts at below 300 mbar ； The first stage generally starts at 100 mbar or less!
With such a configuration, the vacuum pumping efficiency is very high, and it is less affected by fluctuations in steam pressure. Was this designed by Impair? Pay attention to proper treatment of acidic water. Can the water used for replacing pumps be reused?
I would like to ask, isn’t vacuuming required for level 1?