S Zorb装置运行存在的问题及对策

中国石化镇海炼化分公司Ⅱ套S Zorb装置为0.90 Mt/a催化裂化汽油脱硫装置,2018年6月开工后,脱硫能力不足,吸附剂细粉含量大幅上升,系统吸附剂中硅酸锌含量异常升高,质量分数最高达15%,再生烟气过滤器压差快速上升,接近联锁报警值65 kPa,严重影响装置正常运行。通过长时间分析排查及验证,认为造成脱硫能力下降的原因一方面是吸附剂品质下降,另一方面是反应器流化状态不佳;吸附剂品质下降主要是待生吸附剂带烃较多造成的,通过吸附剂置换、降低待生吸附剂带烃量、改善反应器流化状态及调整循环速率和再生温度等一系列措施,装置的脱硫能力、细粉、硅酸锌含量及再生烟气过滤器压差逐步趋于正常。

OPERATION PROBLEMS OF S Zorb UNIT AND COUNTERMEASURES

The S Zorb unit of SINOPEC Zhenhai Refining & Chemical Company is a 0.90 Mt/a FCC gasoline desulfurization unit. After the start-up in June 2018, it was found that the desulfurization activity was insufficient, the fine powder content of the adsorbent was greatly increased, and the zinc silicate content in the system was abnormal, even up to 15%. The pressure difference of the regenerative flue gas filter increased rapidly, close to the interlocking value of 65 kPa, which seriously affects the normal operation of the unit. The analysis and verification indicated that the main reason for the deactivation was the quality of the adsorbent decreased due to more hydrocarbons on the adsorbent. On the other hand, the fluidization state in the reactor was not good. By measures of replacing adsorbent, reducing the amount of hydrocarbons in the adsorbent, improving the fluidization state of the reactor, adjusting the circulation rate and regeneration temperature, the desulfurization activity, amount of fine powder, zinc silicate content and regenerative flue gas filter pressure difference were gradually improved.