Three-effect evaporation crystallization
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For three-effect evaporation crystallization, the negative pressure in the first and third effects is fine, but the negative pressure in the second effect just won’t increase. I’m seeking advice from experts
The gas still isn’t cooled properly, and the pumping capacity isn’t adequate. If it’s a jet pump, then it’s undersized.
In cases where a vacuum is drawn upon startup and there is a non-condensable gas vent, but the vacuum level in the second effect still fails to rise, it indicates that there is a leak somewhere in the second effect. The leak location should be identified. If minor leaks are found, and the vacuum level in the second effect continues to remain low, this suggests that the vacuum pump has a relatively low pumping capacity; in such cases, a vacuum pump with a higher pumping capacity can be used instead. It is impossible for the vacuum level of the second effect to be lower than that of the third effect while the equipment is in operation; if this occurs, the equipment will not be able to evaporate properly.