What are the advantages and disadvantages of replacing stripping steam with dry gas?
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Which has a larger consumption: steam or dry gas in the diesel stripping tower? Is it effective?
It will increase the load on the distillation column top cooler.
The pressure of the dry gas is low, so a large volume must be used; I agree with what was said on the 2nd floor
Will the dry gas cause difficulties for the subsequent gas streams?
This approach is no longer used; accidents had occurred in the past when the load at the top of the dry gas tower was increased linearly. The only advantage of this method was that the diesel contained no water
Is the consumption higher with dry gas than with steam?
I have calculated this issue before; I’ll explain it roughly. Using dry gas as the purge gas at the bottom of the tower results in a significant drop in the temperature at the bottom of the distillation tower, which is not conducive to heat exchange in subsequent processes and also increases energy consumption. At the same gas flow rate, the tower diameter required for dry gas is significantly larger than that required for water vapor. In actual production, however, the tower diameter remains constant; if the same amount of dry gas continues to be fed in, it will result in an excessively high gas flow velocity, which may cause the trays to be overturned. If only the flash point of diesel is considered, then at the same flow rate, its impact is minimal. This is just my personal opinion, for your reference.
Thank you for your advice! Will a lower dry gas volume compared to the stripping steam volume affect the copper sheet and flash point?
Based on calculations, the flash point change for the same amount of air blown in does not exceed 5°C; of course, this is a calculated value for reference only. Corrosion of the copper sheets has not been taken into account, so I’m unable to give you an answer