Severe corrosion on the circulating water side of the water cooler in line 5 of the Atmospheric and Vacuum Distillation units in the petrochemical industry
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The circulating water side of the water cooler in the atmospheric and vacuum distillation unit of the petrochemical industry suffers from severe corrosion. The operating conditions for this tube bundle involve a temperature of 180 degrees on the fifth reduction line, which leads to severe corrosion on the inner wall of the tubes on the circulating water side. The main reasons are, first, the temperature on the shell side of the circulating water heat exchanger is too high ； Secondly, the circulating water itself causes corrosion to the carbon steel tube bundle. Under the influence of these two factors, corrosion is exacerbated. It is recommended to apply a coating for corrosion protection on the circulating water side.
Severe corrosion has occurred on the circulating water side of the fifth-stage water cooler in the pressure reduction units of the petrochemical industry, mainly due to excessively high temperatures in the shell side of the heat exchanger and the corrosion of the carbon steel tube bundle by the circulating water. It is recommended to apply an anti-corrosion coating to the circulating water side. .
How many years has the heat exchanger been in this condition? It is estimated that the fundamental problem lies in the quality of the circulating water. It is crucial to carry out proper pre-coating passivation and to control parameters such as green roots and total phosphorus levels.
Given that the temperature of the minus-five line is so high, it is not necessary to use a water cooler for heat exchange; optimizing the heat exchange network and recovering waste heat can make a greater contribution to reducing the energy consumption of the facility.