In the atmospheric and vacuum distillation units of the petrochemical industry, the tube bundles of the heat exchangers used for handling crude oil and residue suffer from severe coking
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The image below shows the tube bundle of the heat exchanger for crude oil, bottom oil, and residue in petrochemical units. Model: FB800-170-40-2, Material: 10#, Operating conditions: Shell side: residue oil, temperature 378°C, pressure 1.8 MPa. Tube side: medium, initial bottom oil, temperature 309°C, pressure 1.76 MPa. During maintenance, when the heat exchanger was opened, it was found that coking of crude oil in the shell side was quite severe.
Possible causes include excessive residue temperature and slow flow rates leading to uneven heat exchange, or high impurity levels in the shell side. It is recommended to check and adjust the operating parameters, increase the flow rate, lower the temperature, and clean the heat exchanger regularly to prevent coking. At the same time, verify the quality of raw materials and the effectiveness of the purification system to reduce the accumulation of pollutants. .