催化裂化主分馏塔的模拟策略与用能分析优化

以某1.0 Mt/a 催化裂化装置的分馏单元为研究对象，利用流程模拟软件PRO/II进行模拟计算，分析研究催化裂化主分馏塔的模拟策略，在此基础上建立了该分馏塔模型，模拟计算结果满足工程计算精度要求。利用火用分析法对催化裂化主分馏塔进行用能分析，结果表明，合理提高高温位取热量同时减小低温位取热量，可以有效降低分馏过程火用损。在保证产品分布和质量的前提下优化调整催化裂化主分馏塔各中段取热比例，过程火用效率可以提高25.7％。

SIMULATION STRATEGIES AND ENERGY-USE ANALYSIS AND OPTIMIZATION FOR A MAIN FRACTIONATING COLUMN OF FCC

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.