Coking of the tube bundle in petrochemical residue heat exchangers and treatment methods
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The image below shows the coking of the heat exchanger tubes, a problem that is common in petrochemical plants. This condition significantly reduces the heat exchange efficiency of the heat exchanger, and it also causes severe corrosion of the tubes. However, after the heat exchanger has been in operation for a while, a large amount of coke tends to accumulate on it. Its main components are the accumulated petroleum coking substances resulting from high-temperature heat exchange of residue oil, which contain petroleum carbon deposits. The common approach is to use high-pressure water jet technology to remove fouling from the tube bundles after shutting down the equipment, but the results are not satisfactory. The local chemical cleaning method yields good results, achieving relatively thorough removal of the coke deposits.
Coking in the tube bundle of petrochemical residue heat exchangers severely affects heat transfer efficiency and causes corrosion to the tube bundle. Coking is mainly caused by the accumulation of petroleum coke formed from residue at high temperatures. Common treatment methods include high-pressure water jet technology and local chemical cleaning; among these, chemical cleaning is more effective as it can remove fouling more thoroughly. .
Coking due to high conversion in residue hydrogenation, learned* it
Could you advise me on which chemicals to use for chemical cleaning?