Severe blockage of the tube walls inside the heat exchanger bundle of the constant and reduced pressure crude oil dewaxing unit heat exchanger
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The image below shows the tube bundle of the heating water heat exchanger for vacuum distillation residue in the petrochemical industry. Model BES700-40-100-6/25-6, tube bundle material: 10# steel. The operating condition is that the tube side uses a minus-five line, while the shell side starts with base oil ； The operating temperature is 353.8 degrees in the tube side and 303.3 degrees in the shell side ； The pressure in the tube side is 0.91 MPa, and that in the shell side is 1.61 MPa. This tube bundle has been in use for nearly 2 years; corrosion of the reducing line has caused blockage of heat transfer on the inner wall of the tube bundle, affecting the operation of the heat exchange equipment. Reduction pentane is a high-boiling-point oil product that primarily comes from the vacuum distillation process. It features high viscosity and high density. It can resist corrosive media such as hydrogen chloride (HCl), hydrogen sulfide (H2S), and naphthenic acids, which have a strong corrosive effect on metals
The blockage of the inner walls of the heat exchanger tubes during the use of reduced-pressure crude oil is mainly caused by the accumulation of highly viscous and dense corrosive substances from the reduced-five-process, particularly corrosion agents such as hydrogen chloride, hydrogen sulfide, and naphthenic acids. These substances have a strong corrosive effect on the material of 10# steel pipe bundles, leading to scaling or corrosion-induced blockages on the inner walls, which severely affects the heat exchange efficiency. It is recommended to regularly inspect and clean the tube bundles, and consider using more corrosion-resistant materials to improve the equipment’s lifespan and efficiency. .
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