MVR evaporation issues
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In MVR evaporation, when the system compressor starts, the solution in the separator tends to bubble and cause difficulties in material extraction; is this due to flash evaporation or boiling over? Is it related to the adjustment of the system’s vacuum level? How can this problem be resolved?
There is gas dissolved under the liquid; once it’s pumped out, there will be no problem. Adding devices for removing bubbles and foam will help as well
Are there gases dissolved in the liquid? Is it because the evaporation temperature is too high or the vacuum level in the evaporation system is too great, which makes it difficult for the gas to escape?
If the negative pressure is too high, the separator may easily carry material into the steam compressor; raising the liquid level in the separator appropriately can resolve this issue
Thank you. I tried raising the liquid level in the separator, but material is still being drawn out. The liquid inside the separator keeps boiling violently; could this be caused by a high vacuum level or an excessive amount of air being drawn out by the compressor?
This phenomenon that occurs during startup indicates that the temperature of the liquid before starting is relatively high, likely above 60 degrees. Once startup begins, the vacuum level suddenly increases, causing the liquid to evaporate and form bubbles; this is part of the vaporization process and is a normal occurrence
The vacuum level can be controlled by turning it on, gradually increasing it, and making adjustments through slow evaporation
A demister can be installed on the separator; it’s possible that your vacuum level is too high
Thank you. Can the volume of this separator be calculated? What is the method for calculation?
The separation chamber has an evaporation volume intensity of 1.1~1.5 m3/(m3·S) and a height-to-diameter ratio of 1.5~2; generally, a demister should also be installed above the separation chamber.