Abstract:

This paper summarizes the present situation of optimization research on the return tower temperature of FCC rich absorption oil, and points out that in previous studies, the conclusion that the rich absorption oil returned to the tower is not preheated or directly preheated by diesel extracted from FCC main fractionator with higher temperature is unreasonable. Based on the system optimization and exergy analysis, this paper deduces the optimal calculation formula of return tower temperature of the rich absorption oil. The optimal return tower temperature of the rich absorption oil is the average of the top circulation extraction temperature and the return tower temperature minus the heat transfer temperature difference at the end of the heat exchanger when the rich absorption oil is preheated. The optimal return tower temperature of the rich absorption oil is 95～135 ℃. The higher the extraction temperature of FCC top circulation is, the higher the preheating temperature of rich absorption oil returned to the tower should be. The rich absorption oil returned to the tower should be preheated by low temperature waste heat or logistics with suitable temperature, and the temperature of heat source should not be higher than 150 ℃.

Key words: FCCU, rich absorption oil, return tower temperature, optimization model, exergy

摘要：

总结了催化裂化富吸收油返塔温度的优化研究现状，指出：以前研究中，富吸收油返塔不预热或者通过催化裂化主分馏塔抽出的温度较高的柴油进行直接预热是不合理的。基于系统优化和(火用)分析推导出了富吸收油返塔温度的优化计算公式，富吸收油返塔的优化温度为塔顶循环油(顶循)抽出温度与返塔温度的平均值减去富吸收油预热时的换热器端部传热温差。富吸收油返塔的优化温度一般为95～135℃。催化裂化顶循抽出温度越高，富吸收油返塔的预热温度应越高。富吸收油返塔应由低温余热或温度合适的物流预热，热源温度不应高于150℃。

关键词: 催化裂化装置, 富吸收油, 返塔温度, 优化模型, ?,