催化裂化装置工艺参数优化

Study on process parameter optimization of fluid catalytic cracking unit

为减轻装置老化、自动化控制水平低、工艺落后、原料油重质化等诸多不利因素对装置总液体收率的影响,对陕西延长石油集团延安炼油厂400 kt/a催化裂化装置工艺操作参数进行了分析、筛选,选择了对反应影响明显且易于调整的指标,如：催化剂活性、反应温度、剂油比、原料预热温度、产品馏出口抽出温度等进行优化.先保持其他参数基本不变,对某一参数进行调整,检测总液体收率变化,同时关注各参数之间的相互影响,寻求提高装置总液体收率的最佳工艺条件,最终选取的工艺参数为：原料预热温度200 ～ 210℃,剂油比7,反应温度500～505℃,平衡剂活性60％ ～ 63％,在有冷回流和无冷回流时分馏塔顶温度分别为119℃和115℃.结果表明,装置总液体收率从86.12％提升到87.93％,提高了1.81百分点,比装置历史最好值86.72％提高了1.21百分点.

To minimize the negative impacts of aging equipment, low automatic control level, outdated process, heavier oil feedstock, etc of the fluid catalytic cracking unit on the total liquid product yields, the process parameters of the 400,000 TPY FCC unit in Yan＇ an Refinery of Shaanxi Yanchang Petroleum （Group） Co. , Ltd. were analyzed and screened, and appropriate parameters were selected and optimized, such as cata- lyst activity, reactor temperature, catalyst to oil ratio, feed pre-heating temperature and product outlet temperature, etc. One of the parameters was adjusted to see the variation of total liquid yield while other parameters were kept unchanged. At the same time, mutual impacts between different parameters were observed to look for the optimized process conditions for increasing the total liquid yield. The results showed that the total liquid yield of the unit was raised from 86.12% to 87.93% which was 1.81 percentage higher than 86.12% and 1.21 percentage higher than the highest in history （86.72%）