Heat Exchanger Network Retrofit for Optimization of Crude Distillation Unit Using Pinch Analysis

• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Simulation and Optimization
• 页码范围: 31-40
• 页数: 10页
• 语种: 英文

摘要

Crude distillation unit (CDU) is regarded as the main energy consumer in the entire refinery process. In this paper, the process simulation software and the energy management software are used to simulate the flowsheet and analyze the energy consumption, respectively. Stream data obtained from an existing CDU are applicable in the pinch analysis. To reduce the amount of cross-pinch heat transfer, three approaches of resequencing, repiping, and adding heat exchangers are adopted. Compared with the existing CDU, the results demonstrate that the inlet temperature of the furnace can be increased by 25.4 ℃, the amount of hot and cold utilities can be reduced by 15.1％ and 19.6％, respectively. The economic evaluation indicates that the operating cost is saved by 8×106 $/a, and the payback period is about 9 months.