重油催化裂化装置生产清洁汽油的技术改造

TECHNICAL REVAMPING OF A RFCC UNIT FOR CLEAN GASOLINE PRODUCTION

为生产清洁汽油,某炼化公司1.5 Mt/a重油催化裂化装置先后进行了催化裂化汽油辅助提升管(ARFCC)和MIP-CGP工艺技术改造。本文主要介绍ARFCC和MIP-CGP两种不同型式的催化裂化汽油降烯烃工艺的运行情况与技术指标。结果表明:与FCC工艺相比,ARFCC工艺和MIP-CGP工艺均达到了生产清洁汽油的基本要求,但MIP-CGP工艺比ARFCC工艺具有更大的技术优势。采用MIP-CGP工艺改造后装置扩能至1.7Mt/a,掺渣率为15%～53%,汽油品质得到显著提升,掺渣率在35%以下时,汽油烯烃体积分数保持在32%以下,RON在90以上,汽油诱导期大幅度提高,装置能耗也有所下降。

For clean gasoline production, a 1.5 Mt/a RFCC unit was successively revamped by ARFCC technology and MIP-CGP technology to reduce the olefin content of gasoline. The revamping, operation, product slate and property, as well as energy consumption of these two technologies were reviewed in this paper. It was found that compared with base case, both technologies could meet the demand of producing clean gasoline, yet MIP-CGP technology exhibited more technical advantages. Adopting MIP-CGP technology, the capacity of the unit expanded to 1.7 Mt/a, the residue blending ratio could be in the range of 15%-53%, and the quality of gasoline was improved significantly. When residue blending ratio was below 35%, the olefins volume fraction of gasoline could be kept below 32%, RON maintained over 90 and the gasoline induction period was prolonged remarkably. Besides, the energy consumption of the unit with MIP-CGP technology was lower than the other cases.