What are the Pros and cons of Steam stripping and Reboiler? When designing a column, what are the factors that decide to go with each of this?
Answers
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26/11/2014
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Rajkumar Chate, Sulzer, rajkumar.chate@sulzer.com
I do not know which stripper you are talking about. If it is a side stripper of main fractionator then it depends on situation to situation. If you need your product dry (like Kerosene) then it is worth to put a reboiler, however if you are stripping the diesel then it needs a higher temperature to strippout light ends and it is difficult to achieve the required with steam reboiler.
in general stripping steam lowers the partial pressure of hydrocarbons, it has high latent heat and and makes stripping easy compared with reboielr. In other hand if you have a stripper which is operating under vacuum then it will un necessarily load the column and it may have impact on your column capacity, incase you need to stripp lot of light ends from the feed. Also under vacuum operation stripping steam will increase the load on.
Using a stripping steam will generate more sour water, it will increase the load on sour water stripper and increased energy consumption to stripp sour gases from sour water stripper.
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25/11/2014
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Assuming you are referring to the side strippers on a crude atmospheric column: Stripping steam is less expensive as the heat exchanger is not installed. However, if the jet/kero is not hydrotreated, it helps to keep it dry by using a shell and tube reboiler at the side stripper.
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