What to do if the MVR has a high vacuum level, a low system boiling point, and low evaporation capacity?
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The last edit to this post was made by Organometal on 2015-6-12 at 09:26. The process design calls for a pressure of 40 kPa and a temperature of over 80 degrees for the material; however, since the vacuum pump keeps running, the system pressure gradually drops below 20 kPa, and the material temperature falls below 60 degrees
Isn’t there a valve in front of the vacuum pump? Is it possible to adjust the exhaust volume?
This is clearly a problem with the pumping capacity; it seems that the vacuum pump chosen is too powerful. Adjusting the pumping capacity of the vacuum pump is one possible solution.
A tee is installed in front of the vacuum pump inlet pipe, along with several air release valves and air release pipes; by adjusting the opening degrees of these air release valves and the system’s non-condensable gas valves, the optimal operating conditions for the system can be achieved.
With a high vacuum and low boiling point, wouldn’t the evaporation rate be lower? I’ve never heard of anything strange.
In a normal MVR system, what is the steam consumption during operation?
Steam is replenished at 5% to 10% of the evaporation rate; this is how we generally make estimates in our process calculations. However, in reality, different process conditions vary; for example, the amount of make-up steam required for thermal crystallization is certainly different from that for cooling crystallization. It’s not possible to generalize, and each case must be analyzed on its own.
MVR actually consumes steam during operation!