Vacuum pipeline condensate
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I would like to ask about installing a heat exchanger before the vacuum pump, with the aim of reducing the temperature of the gas from the inlet rotary vane pump from 280°C to room temperature in order to improve vacuum efficiency. But the problem that arises is what to do with the condensed liquid at the heat exchanger outlet?
For pipes that flow in rows of 100 along the pipeline, the water content is only 10 kilograms per hour; I don’t think a buffer tank is necessary in this case. .
Either recycle it or discharge it – what else can be done?
There is no essential difference between the liquid inlet of a liquid ring vacuum pump and the inlet through which liquid enters from the suction side; therefore, it is possible to add working fluid to a liquid ring vacuum pump via the suction inlet, but there is a maximum amount limit. (The inlet is usually equipped with a self-priming function, so the addition of fluid occurs as part of an automatic balancing mechanism, whereas adding fluid through the suction inlet requires manual control.) Normally, when liquid is introduced at the inlet, it is necessary to correspondingly reduce the amount of working fluid entering at that inlet. If the temperature of the condensate is high, an exchanger needs to be added for heat exchange, or a separator should be used before the pump for separation. However, under normal circumstances, the temperature of the condensate is about 10°C higher than that after liquid-liquid heat exchange (determined by the heat transfer temperature difference). So, it depends on the specific operating conditions to determine.
Thank you all. Returning to the system is definitely not appropriate; the purpose is to remove water vapor. Using a buffer tank leads to frequent operations due to space constraints, and it’s also a waste to use steel structures to place the heat exchanger at a higher level than the vacuum pump inlet. . . .
See if it can be recycled; otherwise, it has to be discarded