中国炼油与石油化工 ›› 2020, Vol. 22 ›› Issue (4): 108-116.

• Simulation and Optimization • 上一篇    下一篇

Analysis, Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit Treating Residual Oil

包振宇,王宁,张宏飞,段永锋,于凤昌   

  1. 中石化炼化工程(集团)股份有限公司洛阳技术研发中心
  • 收稿日期:2020-04-08 修回日期:2020-05-24 出版日期:2020-12-30 发布日期:2020-12-30
  • 通讯作者: 包振宇 E-mail:baozhenyu.segr@sinopec.com
  • 作者简介:2020-10-01
  • 基金资助:
    沸腾床加氢生成重油综合加工及相关技术研究

 Analysis, Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit Treating Residual Oil

Zhen-Yu Bao1,Ning Wang1,Hong-Fei Zhang2,Yong-Feng Duan2,Feng-Chang Yu2   

  1. 1. R&D Center of Luoyang Technology, SINOPEC Engineering (Group) Co., LTD.
    2.
  • Received:2020-04-08 Revised:2020-05-24 Online:2020-12-30 Published:2020-12-30
  • Contact: Zhen-Yu Bao E-mail:baozhenyu.segr@sinopec.com
  • Supported by:
    Comprehensive Processing and Related Technology Research of Heavy Oil Ebullated-Bed Hydrogenation

摘要: Ammonium chloride corrosion in the reactor effluent system remains to be a barrier for the safe operation of the ebullated-bed hydrogenation unit as impurity contents are higher compared with that of the ordinary hydrogenation units. In this research, a case study in Sinopec was provided with 2.92 μg/g Cl and 0.38% N in the feed oil, and the impurity contents was representative in residue oil. The deposition patterns in heat exchangers were investigated by changing process variables, then water wash strategy was optimized in view of relative humidity, and the minimum water flowrate was obtained, finally, process optimization suggestions concerning the operation of heat exchangers were proposed. Results show that with the measured content of nitrogen and chlorine in the feed, the NH4Cl deposition temperature of hot high-pressure vapor and hot low-pressure vapor are 223.4 °C and 173.7 °C, respectively, and the minimum water wash flowrate for heat exchangers of hot high-pressure vapor with mixed hydrogen and hot low-pressure vapor with cold low-pressure oil are 38.0 t/h and 5.4 t/h, respectively. Water wash should be carried out intermittently upstream of the heat exchanger tube passes. In consideration of energy consumption, it is recommended to reduce the tube pass outlet temperature of the above heat exchangers to 240 °C and 190 °C, respectively.

Abstract:  Ammonium chloride corrosion in the reactor effluent system remains to be a barrier for the safe operation of the ebullated-bed hydrogenation unit as impurity contents are higher compared with that of the ordinary hydrogenation units. In this research, a case study in Sinopec was provided with 2.92 μg/g Cl and 0.38% N in the feed oil, and the impurity contents was representative in residue oil. The deposition patterns in heat exchangers were investigated by changing process variables, then water wash strategy was optimized in view of relative humidity, and the minimum water flowrate was obtained, finally, process optimization suggestions concerning the operation of heat exchangers were proposed. Results show that with the measured content of nitrogen and chlorine in the feed, the NH4Cl deposition temperature of hot high-pressure vapor and hot low-pressure vapor are 223.4 °C and 173.7 °C, respectively, and the minimum water wash flowrate for heat exchangers of hot high-pressure vapor with mixed hydrogen and hot low-pressure vapor with cold low-pressure oil are 38.0 t/h and 5.4 t/h, respectively. Water wash should be carried out intermittently upstream of the heat exchanger tube passes. In consideration of energy consumption, it is recommended to reduce the tube pass outlet temperature of the above heat exchangers to 240 °C and 190 °C, respectively.

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