关键词: 连续重整装置, 再生循环气, 干燥系统, 腐蚀, 冷却器, 分离器, 气体入口管线

Abstract:

For CCR unit that employ dry cooling cycles for catalyst regeneration, regenerative recycle gas drying is an indispensable system in continuous catalytic reformers. In recent years, corrosion and leakage problems have occurred many times, which seriously affects the long-term operation of the unit. An analysis was conducted on the corrosion causes of the internal coolers, separators and connecting pipelines in the regeneration cycle gas drying system of four continuous reforming units. It was found that the main causes of corrosion were acidic gas dew point corrosion and circulating water corrosion. In response to the current corrosion situation, a series of control measures to extend the operating cycle are proposed in the following text. Increasing the inclination angle for the installation of the inlet and outlet of the heat exchanger shell in the process design, and adding filters. Add fiberglass or PTFE lining to the separator and connecting pipes in the material selection, and add coating anti-corrosion to the carbon steel pipe bundle of the water cooler; Control the quality of circulating water in operation, strengthen monitoring of process parameters and corrosion conditions.

Key words: CCR unit, regeneration recycle, gas dryer, corrosion, cooler, separator, gas inlet pipeline