Abstract:

The Aspen Plus simulation software is used to study the product quality optimization of FCC unit. The influence of the type and amount of stripping medium, the dry point of stabilized gasoline and the pumparound flowrate of main fractionator on the product quality of crude gasoline and light diesel, the output of stablized gasoline and the inlet flowrate of wet gas compressor is studied. Based on the study, the product quality of FCC unit is optimized, the output of high-value product stabilized gasoline is increased, and the energy consumption of unit is reduced. The results show that using low-low pressure steam or low pressure steam as the stripping medium, controlling the stripping steam flowrate within 3% ~ 4% of diesel flowrate and controlling the dry point of stabilized gasoline at about 200℃ are beneficial to controlling product quality, stabilizing gasoline output and reducing the energy consumption of FCC unit.

Key words: catalytic cracking unit/CCU')">

catalytic cracking unit/CCU, product quality, simulation, optimization