连续重整PS-Ⅵ催化剂硫中毒分析及对策

Analysis of sulfur poisoning of CCR PS-Ⅵ catalyst and countermeasures

福建联合石油化工股份有限公司芳烃联合装置重整单元采用UOP公司开发的第三代低压连续重整及再生技术,设计规模为1.4 Mt/a。装置在检修开工过程中由于预加氢汽提塔(C101)液位不准,造成淹塔,丧失分离效果。大量高硫、高水石脑油进入重整反应系统,造成重整催化剂严重硫中毒,测得重整循环氢中H2S质量浓度最高达56 mg/L。发现硫中毒后,首先稳定C101操作,校准C101液位计,保证重整进料合格;然后增加重整注氯,抑制硫的可逆吸附;通过低负荷热氢脱硫、催化剂循环热氢脱硫后将循环氢中H2S质量浓度降至4 mg/L;最后通过启动再生器烧焦,以低负荷再生烧焦循环脱硫的手段进行处理。在硫中毒17 d后,循环氢中H2S质量浓度降至小于0.5mg/L的正常水平,基本恢复了催化剂活性。

The 3rd-generation low pressure continuous catalytic reforming and regeneration technologies developed by UOP have been applied in the continuous catalytic reforming unit of aromatic complex of Fujian Refining and Petrochemical Co. , Ltd. The unit is designed at a capacity of 1.4 million tons per year. In the start-up after overhaul, because the level gauge in pre-hydrogenation stripper＇s （C101） didn＇t work properly, the stripper was flooded, resulting in the loss of C101 separation efficiency. A large amount of high-sulfur high-water naphtha flowed into the reforming reaction system, leading to severe sulfur poisoning of catalyst PS- VI. The measured H2S in reformer recycle hydrogen was up to 56 mg/L. After sulfur poisoning was found, the C101 operation was first stabilized by the calibration of C101 level gauge to ensure the required specifications of reformer feed. In addition, the injection of chlorine was increased to inhibit the reversible absorption of sulfur. The H2S in the recycle hydrogen was reduced to 4 mg/L through the low-load hot hydrogen desulfurization and the hot hydrogen desulfurization of catalyst circulation. Ultimately, the H2S was further reduced in the low-load coke burning in the regeneration. 17 days after sulfur poisoning, the HiS in recycle hydrogen was reduced to lower than 0.5 mg/L. The activity of the catalyst was basically restored to the level before poisoning.