UOP常压连续再生重整催化剂还原问题的探讨

DISCUSSION ON THE DEOXIDATION OF CCR CATALYST IN THE UNIT USING UOP REGENERATION TECHNOLOGY

对扬子石化有限公司连续重整装置催化剂还原过程进行分析,认为存在的主要问题是还原气中水含量高和氢纯度偏低。参考UOP公司及其它重整装置的经验,对重整催化剂还原工艺进行了改进,将90%的还原废气排入增压氢系统,可有效降低还原区的水含量;用PSA氢替代循环氢,可进一步提高还原区氢纯度,从而提高还原反应速度,改善再生催化剂的性能,使重整反应的芳烃产率有所提高。另外,在日常操作中应尽可能采用下部空气烧焦,增压氢聚集器滤芯应当每年更换一次,还应保证催化剂在缓冲料斗内充分冷却。

The deoxidation process of the CCR catalyst regeneration at SINOPEC Yangzi Petrochemical Company was discussed. It was found that low hydrogen purity and high moisture content of the hydrogen used for deoxidation was the main cause. Countermeasures such as exhausting 90M of the waste gas from the deoxidation process to hydrogen recompression system to reduce the water content in deoxidation zone, and using hydrogen from PSA unit to replace recycle hydrogen to increase the hydrogen purity,were adopted. Since then the activity of the regenerated catalyst was improved and the aromatics yield was increased. Suggestions in daily operation and maintainance were proposed as well.