Severe residue coking in the tube bundle shell of the atmospheric and vacuum crude oil deslagging heat exchanger in the petrochemical industry
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The image below shows the tube bundle of the vacuum distillation crude oil deslagging heat exchanger in the petrochemical industry; under normal operating conditions, the crude oil flows through the tube side while the residue oil flows through the shell side； The operating temperature is 210 degrees in the tube side and 272 degrees in the shell side ； The pressure in the tube side is 0.43 MPa, and that in the shell side is 1.6 MPa. After being in use for over a year, this tube bundle suffered severe fouling on the shell side, which affected its normal operation.
In this case, it is recommended to take the following measures: 1. Regularly inspect and clean the heat exchanger to remove tar deposits that form in the shell side. 2. Consider increasing the operating temperature or adjusting the flow rate to optimize the heat exchange efficiency of crude oil and residue in the heat exchanger, thereby reducing the likelihood of coking. 3. Use an anti-coking inner coating or select materials with better anti-coking properties to manufacture the heat exchanger. 4. Consider using additives to improve the fluidity and stability of residue and reduce coking. 5. Conduct an optimized analysis of the operation process to identify the key factors that may lead to coking, and make corresponding adjustments. .