Coking and corrosion of the heat exchanger tube banks in the Constant Pressure and Reduced Pressure units of petrochemical plants, Line 1 and Line 3
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The image below shows the heat exchanger tube banks of the atmospheric and vacuum distillation units in the petrochemical industry, specifically those in Line 1 and Line 3. Model: FLB500-55-25-2, Material: 10#, Operating conditions: Shell side: Normal pressure line, temperature 180°C, pressure 0.8 MPa. Tube side: Medium, typically three-wire, temperature 330°C, pressure 1.1 MPa. During maintenance, when the heat exchanger was opened, severe coking was found in the shell side, along with corrosion of the metal.
In the atmospheric and vacuum distillation units of the petrochemical industry, the severe coking and corrosion of the heat exchanger tube banks in the atmospheric and third-stage lines may be caused by: 1. Excessively high temperatures: A tube-side temperature of 330°C can lead to the cracking and coking of heavy components. 2. Medium properties: The medium used for transmission may contain a high amount of impurities or heavy components, which promotes coking. 3. Uneven flow: Insufficient flow rate or poor flow conditions can lead to inadequate heat exchange, exacerbating coking. 4. Material issue: 10# steel has limited corrosion resistance in high-temperature and high-pressure environments, and is prone to corrosion. 5. Operating conditions: Are there any issues with the operating parameters, such as improper control of flow rates and temperatures? It is recommended to conduct a detailed analysis, improve operating conditions, optimize maintenance strategies, and consider using materials that are resistant to high temperatures and corrosion. .