Evaporator design
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I recently received a device design, which is an ammonia evaporator. There is no second heat source on site, so electric heating can only be used. I’ve never done this before; I don’t even know what type it is. Is there anyone who could give me some guidance? What type of evaporator is this? :loveliness: Also: there are some questions. 1. Ammonia solution is corrosive; what amount of corrosion allowance is required when using stainless steel? Note that the ammonia solution here is kept under continuous heating. 2. The equipment itself does not have any pressure. How does the last gas get out? Is it like boiling water? :funk: Last edited by jia717 on 2009-4-13 18:56 ]
I’ve never worked with electrically heated evaporators, so I’m unable to help. As for the second question: the pressure level in such devices is actually determined by two factors: 1. the characteristics of the heat source and the heating rate, 2. the characteristics of the piping system. (Of course, within the pressure range that the equipment can handle.) This post was last edited by lucky1909 on 2009-4-13 at 13:49.]
Since there is no second heat source on site, electric heating is used. However, heating ammonia water is highly corrosive. No ordinary material can guarantee a duration of use.
The corrosiveness of ammonia water on iron: http://bbs.hcbbs.com/viewthread.php?tid=149468 – this should be helpful to you~
Let’s design it using titanium alloy. I am also working on evaporator design, and there are many questions I would like to ask everyone: 1. How to calculate the pressure drop in a rising film evaporator? 2. Should baffle plates be used?