关键词: 火用分析, 催化裂化装置, 蒸馏塔, 模型

Abstract: The simulation strategy for the main fractionation column of a 1.0 Mt/a fluid catalytic cracking (FCC) unit by using PRO/II software was discussed in this article. Simulation, energy-use analysis and optimization were also done for said FCC fractionating column. The compositions of the feed stream to the column were estimated by an isothermal flash in a backwards manner with known data of the product streams. Grayson-Streed method was chosen for the simulative calculation. The main fractionating column was divided into seven sections, and appropriate plate efficiencies were adjusted based on the known data of product streams. According to the simulation strategies, a model of said main fractionating column was built and the simulated results met the precision requirements of engineering calculation An energy-use analysis for this column was done through the energy and exergy analysis, and ε－Q drawings were used to reflect the process exergy loss. According to the study, the exergy loss of the column could be improved by enhancing the heat exchange of internal pump around with high temperature streams and reducing such exchange with low temperature streams. Simulation results showed that the exergy efficiency of the process could increase up to 25.7% with the aforementioned techniques without sacrificing requirements on the product distributions and specifications.

Key words: exergy analysis, catalytic cracking unit, distillation column, model