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

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

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. 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/Abstract

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.

Key words:

中图分类号:

包振宇王宁张宏飞段永锋于凤昌. Analysis, Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit Treating Residual Oil[J]. 中国炼油与石油化工, 2020, 22(4): 108-116.

Zhen-Yu Bao Ning Wang Hong-Fei Zhang Yong-Feng Duan Feng-Chang Yu. Analysis, Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit Treating Residual Oil[J]. China Petrol Proc & Petrochem Techn, 2020, 22(4): 108-116.

参考文献

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

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

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