Corrosion on the outer surface of the furnace tubes in atmospheric and reduced-pressure units in the petrochemical industry
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The image below shows corrosion of the furnace tubes in the atmospheric pressure furnace used in petrochemical distillation processes. The structural type is box-type, and the furnace tube material is chrome-molybdenum steel. The operating conditions are: initial bottom oil in the furnace tube, inlet temperature of 300/exit temperature of 368, and inlet pressure of 1.5/exit pressure of 0.5 MPa. This furnace tube has been in use for over 2 years, and uneven pitting has appeared on its surface.
This phenomenon may be caused by high temperatures and chemical corrosion. In petrochemical environments, the materials in contact with furnace tubes may contain corrosive elements such as sulfur and nitrogen, and when combined with high temperatures, this accelerates the corrosion of steel. Furthermore, fluctuations in operating conditions, such as instability in temperature and pressure, can also exacerbate corrosion. It is recommended to check and adjust the process parameters to ensure a stable and uniform distribution of the fluid inside the furnace tubes, and to consider conducting regular corrosion monitoring and maintenance in order to extend the service life of these tubes. .
There are various reasons: the choice of materials and the processing techniques are factors that need to be considered during the design phase. For existing products, improvements are mainly made by optimizing the process parameters such as flow rate, temperature, and pressure. For more details, please refer to the second floor
The outer wall of the furnace tube is probably due to a fuel issue