关键词: 分子集总, 催化裂化柴油, 原料表征, 加氢精制, 加氢改质, 反应模型, 轻重切割, 效益评价

Abstract:

A study on hydrogenation reaction and distillation cutting based on molecular lump is conducted to reduce hydrogen consumption of LCO processing in a refinery. Modeling the actual working conditions on site data using Aspen HYSYS software, characterizing the LCO feedstock using molecular lump, and analyzing the concentration effect of LCO after distillation cutting on different molecules based on molecular lump, and evaluating the changes in hydrogen consumption, product properties, and downstream comprehensive utilization after molecular concentration by modeling the hydrogenation reaction, in order to quantitatively calculate the product properties and overall benefits after light and heavy LCO refining. Combined with the site conditions, distillation cutting 76.5 t/h LCO at 290～310 ℃, where the light LCO is sent to the hydrofining unit and the heavy LCO is sent to the hydroupgrading unit, which can improve the selectivity of LCO hydrogenation process and effectively avoid the over saturation and ring opening of monocyclic aromatic hydrocarbons and cycloalkane. Through modeling analysis and optimization calculation, the pure hydrogen consumption in the LCO hydrogenation process is reduced by 2,380 m³/h, which is equivalent to a 9.9% reduction in hydrogen consumption of the entire factory's LCO processing. Combined with distillation cutting energy consumption and other costs, the annual comprehensive benefit of the plan is 15.74 million yuan.

Key words: molecular lump, LCO, feedstock characterization, hydrofining, hydroupgrading, reaction model, distillation cutting, benefit evaluation