Is the heating chamber for secondary steam in multi-effect evaporation not considered a pressure vessel?
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I saw a statement on the forum saying that secondary steam does not fall under the category of pressure vessels. In multi-effect evaporation equipment, the first heating chamber is a pressure vessel, while the second, third, and fourth heating chambers are not pressure vessels. The original address is as follows: http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1206090&highlight=%D5%F4%B7%A2%C6%F7. I’m confused; is this sentence correct?
It depends on what the pressure is during the secondary flash. To determine whether it is a pressure vessel
Yes, the conventional judgment method refers to those 3 criteria. I wonder if there are other standards that specify that multi-effect evaporation does not fall under pressure vessels?
There shouldn’t be any; many second and third effects operate at normal pressure
The multi-effect evaporation type operates by reducing the vacuum level; the heating chamber used for evaporation is a pressure vessel. However, only the evaporation that takes place once is subject to inspection, while the subsequent evapurations are not
Whether the two-effect heating chamber is a pressure vessel depends on the steam inlet pressure; if this pressure meets the specifications for pressure vessels, then it should still be treated as such I don’t see any specific regulations stating that a secondary heating chamber constitutes a pressure vessel. Some evaporators have a vacuum in their last stage, but they have a large number of stages; the pressure of the secondary steam in the first stage remains quite high. It seems that designing them without following the requirements for pressure vessels does not comply with the regulations.
It mainly depends on whether the pressure and temperature of the secondary gas meet the regulatory requirements