Selection of vacuum pumps
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We need to choose a vacuum pump. The system currently contains liquid, and the vertical reciprocating vacuum pump we purchased isn’t suitable. Should we go with a steam jet pump or a water ring vacuum pump? However, the medium contains ammonia; please help us make a choice. It seems that neither of these two options is very good either；
1. What are the vacuum requirements? 2. Material corrosion status (possible corrosive ions)? 3. Is there water contained in the material? 4. Degree of material combustion and explosion? It’s only after these four points are determined that we can choose a pump!
Water ring vacuum pumps are good as they can tolerate a small amount of liquid. Ammonia is water-soluble and can be absorbed by the working fluid
The water ring type is better; when ammonia is present, the thermal efficiency of vapor spray is lower, so the water ring type is the preferred choice……
The last edit to this post was made by mfsjpsq on 2016-5-1 at 15:32. If droplets are present and cannot be removed, then a liquid ring pump must be used； At the same time, if a pressure of over 100 mbar is required, choose a liquid ring pump. But one thing is, the working fluid might need to be replaced after some time, because it will turn into ammonia over time, and its saturated vapor pressure will keep increasing! It still depends on the pressure you need.
The process requirements are not clear, so selection should not be made blindly; P:L
The selection is determined based on the vacuum level. For high vacuum levels, it is recommended to use a steam ejector; for low vacuum levels, a water ring pump is suggested.
Using a reciprocating vacuum pump in an ammonia system is clearly not appropriate; considering an ammonia absorption process in conjunction with system vacuumization could be an option. It is recommended to use a circulation pump
Consider using a water ring pump; if a closed-loop system is employed, it is necessary to regularly replace the circulating seal fluid