Discussion on the installation location of condensers in vacuum systems
Thread Content
Experts, the factory uses single-effect concentrators to concentrate materials under low pressure in order to recover ethanol. A water ring vacuum pump is used for vacuum pumping. Currently, the ethanol recovery efficiency of the single-effect concentrator is too low; therefore, it is planned to add a condenser to recover ethanol. At the same time, considering replacing the water-ring vacuum pump with a dry vacuum pump, it is worth asking whether the condenser should be installed ahead of or behind the dry vacuum pump Why?
First, reduce the power of the pump at the back
Thank you! Placing it at the front does indeed reduce the pump’s power, which is an advantage; are there any other advantages as well? I’d like to know more in detail
Since the discharge pressure of a dry vacuum pump is at atmospheric pressure, can the condenser be placed at the back so that it can be cooled by circulating water instead of low-temperature water? However, compared to installation at the front, installation at the back results in a higher exhaust volume; consequently, the equipment required has a greater exhaust capacity, leading to higher costs for such equipment. I’m not sure if I understand correctly~
Yes, when installed at the back, it can use cooling circulating water, which is an advantage of having it installed there
Personally, I prefer to install it after the pump; it really depends on the vacuum and temperature before the pump. Personally, I think the vacuum level before the pump is very high; at such a vacuum level, the boiling point of methanol is very low. Attempting to condense the gas at high vacuum levels will yield poor results. I hope this helps you.
The vacuum level is approximately -0.09 MPa, and the temperature of the ethanol vapor is 45–55°C; initially, it is planned to use chilled water (7–10°C) for cooling
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Secondary condensation of the solvent, with a condenser placed in front of the vacuum pump as well as one placed behind it
Installed at the front; it will have an impact on the vacuum pump at the back
If it is installed at both the front and back, the modification becomes slightly more complex. Having seen cases in other companies where it is installed on both sides, it is mainly the first condenser that operates.