Abstract: Atmospheric and vacuum distillation unit is the leading unit of crude oil processing in refineries. Its long-term stable operation capacity determines the "safe, stable, long-term, full capacity and excellent" operation of refineries. With the worsening trend of crude oil processing in refineries, the corrosion of equipment and pipelines in atmospheric and vacuum distillation units, especially in the low-temperature part of the atmospheric column top system, has become a difficult problem and pain point in the industry. This paper analyzes the root causes of corrosion of atmospheric column top system, systematically expounds the comprehensive design technology of corrosion control from multiple angles such as material design, process anti-corrosion, on-line desalination, corrosion monitoring and detection, and puts forward effective anti-corrosion strategies which can ensure the stable operation of atmospheric and vacuum distillation unit effectively.

Key words: atmospheric and vacuum distillation unit, atmospheric tower top system, low temperature, integrated design, anti-corrosion