How to clean the coking deposits in the tube bundle of a residue oil heat exchanger
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The image below shows the residue heat exchanger tube bundle in a crude oil refining plant’s atmospheric and vacuum distillation unit. The equipment has been in operation for nearly 2 years, and a large amount of coking has accumulated on the outer walls of the tube bundle, severely affecting the heat exchange efficiency of the exchanger. What methods can be used during maintenance to completely remove the coking deposits from the heat exchanger tubes?
It seems that soaking in a solvent capable of dissolving these residue oils is required, along with high-pressure water flushing.
This is caused by incomplete purging and cooling. Currently, high-pressure water cleaning is generally used.
It can be heated with steam first, and then cleaned with a high-pressure water gun.
High-pressure cleaning. It will need to be carefully inspected later; it might end up being unusable
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With it in this state, why didn’t you start cleaning it sooner?