中国炼油与石油化工 ›› 2021, Vol. 23 ›› Issue (2): 34-43.

• Simulation and Optimization • 上一篇    下一篇

Heat Exchanger Network Retrofit of Diesel Hydrotreating Unit Using Pinch Analysis

孙梦迎1,张凤娇1,刘兴隆2,孙兰义3   

  1. 1. 中国石油大学(华东)化学工程学院重质油国家重点实验室
    2. 中国石油大学(华东)化学工程学院
    3. 中国石油大学(华东)
  • 收稿日期:2020-07-27 修回日期:2020-10-10 出版日期:2021-06-30 发布日期:2021-06-10
  • 通讯作者: 孙兰义 E-mail:sunlanyi@upc.edu.cn
  • 作者简介:2020-09-24

Heat Exchanger Network Retrofit of Diesel Hydrotreating Unit Using Pinch Analysis

Sun Mengying1,Zhang Fengjiao2,Liu Xinglong2,Sun Lanyi3   

  1. 1. China University of Petroleum (East China),College of Chemical Engineering,State Key Laboratory of Heavy Oil Processing
    2.
    3. China University of Petroleum (East China)
  • Received:2020-07-27 Revised:2020-10-10 Online:2021-06-30 Published:2021-06-10
  • Contact: Sun Lanyi E-mail:sunlanyi@upc.edu.cn

摘要: Diesel hydrotreating unit (DHT) is an integral part of the refinery, and its energy-saving optimization is of great significance to the enterprise. In this paper, process simulation software and energy management software are used to simulate the flowsheet and analyze the energy consumption, respectively. Stream data obtained from an existing DHT are applied in the pinch analysis for retrofitting the heat exchanger network (HEN) to achieve maximum energy utilization by using pinch analysis. Since DHT is constrained by pressure, the pressure factor is considered in the process of retrofitting. The results show that the amount of cross-pinch heat transfer is reduced, the inlet temperature of the furnace is increased by 55 ℃, and the amount of hot and cold utilities can be reduced by 70.25% and 50.16%, respectively. The economic evaluation indicates that the operating cost is saved by 4.39×106 $/a, and the payback period is about 2 months.

关键词: pinch analysis, pressure, diesel hydrotreating unit, heat exchanger network, energy saving

Abstract: Diesel hydrotreating unit (DHT) is an integral part of the refinery, and its energy-saving optimization is of great significance to the enterprise. In this paper, process simulation software and energy management software are used to simulate the flowsheet and analyze the energy consumption, respectively. Stream data obtained from an existing DHT are applied in the pinch analysis for retrofitting the heat exchanger network (HEN) to achieve maximum energy utilization by using pinch analysis. Since DHT is constrained by pressure, the pressure factor is considered in the process of retrofitting. The results show that the amount of cross-pinch heat transfer is reduced, the inlet temperature of the furnace is increased by 55 ℃, and the amount of hot and cold utilities can be reduced by 70.25% and 50.16%, respectively. The economic evaluation indicates that the operating cost is saved by 4.39×106 $/a, and the payback period is about 2 months.

Key words: pinch analysis, pressure, diesel hydrotreating unit, heat exchanger network, energy saving