When the secondary steam from the last effect of multi-effect evaporation needs to be recovered, what type of condenser should be chosen?
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Do you only know that an indirect condenser needs to be chosen, but are you not aware that a vacuum system is also required? I hope those who have done this before can explain it.
Of course, a vacuum system is needed; otherwise, how can a temperature gradient be created to enable evaporation in the subsequent stages? It is recommended to use plate condensers (for the evaporation of juices, citric acid, etc.), or shell-and-tube condensers (for caustic soda, etc.)
Can seawater be used as the cooling water for the condenser? If seawater is used, are there higher requirements for corrosion protection of the condenser?
Seawater can be used, but in that case titanium plates are required; circulating water is sufficient. For ordinary materials, 304 steel will do, as it involves negative pressure steam and water
:$Not understanding evaporation, it drifts by helplessly. . . Marked it first
By the way, I have a question for the original poster. . . What are some recommended books on calculations for condensation and evaporation?:D
Yoshiro Oba’s Japanese book titled \"Heat Exchanger Design\" (that’s the name I think it has) can serve as a reference. Secondary steam condensation can be achieved using direct-contact condensers; jet condensers can also be used when the amount of steam is small.
Generally, a water ring vacuum pump is designed after the final effect condenser. The selection of such a vacuum pump is primarily based on power parameters, which are determined by factors such as the evaporation temperature in the final stage of multi-effect evaporation, as well as the flow resistance of the condenser and associated components. Therefore, the design and selection of the condenser are very important. You can consult organizations such as Lanzhou Petroleum Machinery Research Institute and Lanzhou Hengda Petrochemical Machinery Company; they are leaders in China in terms of evaporation technology and engineering experience. A few suggestions, for reference only.
Those up there who don’t understand shouldn’t mislead others; if you want to post irrelevant content, at least don’t do it in this way. When selecting a vacuum pump, it is necessary to first calculate the pumping volume, which is the volume of non-condensable gases in the entire evaporation system. Shell-and-tube heat exchangers are generally used for condensers. Generally, two openings are provided at the bottom: one for drawing out non-condensable gases and the other for drawing out condensed water. I’m not very familiar with plate condensers, but they are generally used for single-phase heat exchange; I haven’t encountered any applications involving phase change in heat exchange with plate condensers.