Optimization of Crude Distillation Unit Case Study of the Port Harcourt Refining Company

• 作者: Kenneth K. Dagde
• 来源期刊: 化学工程与科学期刊(英文)
• 学科: 文学
• 关键词: Simulation OPTIMIZATION Mole Fraction Temperature Tray Number Pressure HYSYS
• 年，卷（期）: 2020,（3）
• 页码范围: 123-134
• 页数: 12页
• 分类号: J53

摘要

An HYSYS model for the crude distillation unit of the Port Harcourt Refining Company has been developed. The HYSYS model developed includes 3 mixers, 3 heaters, 1 heat exchanger, 1 desalter (3-phase separator), 2-phase separator and the main fractionating column. The raw crude was characterized using Aspen HYSYS version 8.8 and the developed model was simulated with the industrial plant data from the Port Harcourt Refining Company. The HYSYS model gave component mole fractions of 0.2677, 0.1572, 0.2687, 0.0547, 0.2517 for Naphtha, Kerosene, Light Diesel Oil (LDO), Heavy Diesel Oil (HDO) and Atmospheric Residue and when compared to plant mole fractions of 0.2710, 0.1560, 0.2650, 0.0530, 0.2550 gave a maximum deviation of 3.2%. The HYSYS model was also able to predict the temperature and the tray of withdrawal for Naphtha, Kerosene, Light Diesel Oil (LDO), Heavy Diesel Oil (HDO) and Atmospheric Residue as follows: tray 1 (120<span style='font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;'>&#176;</span>C), tray 12 (206<span style='font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;'>&#176;</span>C), tray 25 (215<span style='font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;'>&#176;</span>C), tray 35 (310<span style='font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;'>&#176;</span>C) and tray 48 (320<span style='font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;'>&#176;</span>C) which was also compared with plant data and gave a maximum deviation 23.2%. The HYSYS model was then optimized using Sequential Quadratic Programming (SQP) with the industrial plant data as starting values of operating conditions. The optimization increased the mass flow rate of Naphtha product from 7.512E+004 kg/hr to 7.656E+004 kg/hr, Kerosene product from 5.183E+004 kg/hr to 5.239E+004 kg/hr, Light Diesel Oil (LDO) product from 1.105E+005 kg/hr to 1.112E+005 kg/hr, Heavy Diesel Oil (