Distillation shutdown purging
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I would like to ask everyone about the shutdown and purging of the distillation section (stripper) in the diesel hydrogenation unit. Stirring steam is used as a purging gas source to purge various equipment and pipelines. So, should we first steam the tower to ensure that there is no oil or gas in the stripping tower before purging other pipelines and equipment, or should we directly activate all relevant processes and carry out a comprehensive sealed purge?
It seems that the tower should be steamed first to ensure that there is no oil or gas inside it; otherwise, the oil and gas in the tower will keep being carried by steam into various pipelines and equipment, making it impossible to achieve the required purity. In other words, first clean the equipment (towers) upstream of the steam purging process to ensure that the steam is clean, before allowing steam to flow into various pipelines and devices. I’m not sure if it’s right.
Steam injection can be used for purging; after purging for a certain period of time, venting from the upper parts of the Zhuge equipment and the lower points of the pipes is carried out to check the quality of the purging
Why not set a purge steam for each process? Purging in this way is a waste of time, and the purging effect is not good either.
Stirring steam can be used as a purging gas source to purge both the equipment and pipelines; however, the process setup must be proper. Care should be taken to ensure that the pressure levels in the various equipment and pipelines remain within acceptable limits during purging, so as to avoid overpressure. Additionally, when designing the purging process, it is important to avoid any dead zones or situations where there are circular flows within the process.