催化裂化汽油轻重切割点的优化与选择
2020-08-24王伟牛世坤陈光
王伟 牛世坤 陈光



摘 要:某炼厂在通过对催化裂化汽油进行硫形态分析和族组成分析后,通过流程优化软件RSIM(refinery-simulation)对切割塔进行模拟,实现对轻重汽油的精确切割。在保证轻重汽油加工后混合总硫质量满足国V汽油标准前提下,在催化裂化汽油进入汽油吸附脱硫装置前,将催化裂化汽油中的高烯烃馏分尽可能多地切入轻汽油中,减少催化裂化汽油在汽油吸附脱硫过程中由于烯烃饱和导致的辛烷值损失。结果表明:优化过后的催化裂化汽油辛烷值损失大幅降低,约有0.8个单位。
关 键 词:国五汽油;催化裂化;优化;辛烷值损失;RSIM
中图分类号:TQ 028 文献标识码: A 文章编号: 1671-0460(2020)06-1229-04
Optimization and Selection of Light Oil and Heavy Oil Cutting Point for Catalytic Cracking Gasoline
WANG Wei1, NIU Shi-kun2,CHEN Guang2
(1. Sinopec Jiujiang Branch, Jiujiang Jiangxi 332004, China;
2. Dalian Research Institute of Petroleum and Petrochemicals, Dalian Liaoning 116000, China)
Abstract: Reducing the octane number loss of FCC gasoline during secondary processing can help improve the efficiency of oil refining enterprises. In a refinery, after analysis of sulfur speciation and PONA of FCC gasoline, the cutting tower was simulated by process optimization software RSIM (Refinery-simulation) to achieve the precise cutting of light and heavy gasoline. Under the premise of ensuring that the sulfur content of mixed gasoline after processing light gasoline and heavy gasoline can meet the national V gasoline standard, before the catalytic cracking gasoline was transported to the gasoline adsorption desulfurization unit, high olefin fractions should be cut into light gasoline as possible to reduce the loss of octane caused by olefin saturation during FCC gasoline desulfurization. The results showed that the octane loss of FCC gasoline after the optimization was greatly reduced, about 0.8 units.
Key words: National V gasoline standard; FCC; Optimization; Octane loss; RSIM
為了应对日趋严峻的环境问题,环保法规日益严格,汽油的硫含量标准在逐年修订,发展和使用超低硫汽油是当今世界范围内清洁燃料发展的趋势。我国催化裂化(以下简称FCC)汽油占汽油池总量的70%以上,是汽油池中的主要组分油,FCC汽油的辛烷值决定了汽油池的基础辛烷值[1]。
目前,某炼厂催化裂化汽油硫质量分数在400 mg·kg-1左右,烯烃含量在25%~30%,由S zorb装置加工该汽油至国V水平。S zorb技术作为加氢领域应用的新工艺,有着类似其他流化床装置的特点,在实际生产工程中,装置处理量受到催化剂再生速率的制约。因此S zorb的负荷上限,成为催化裂化装置的汽油产量的限制,对终端产品国V汽油产量造成影响。
为提高催化裂化汽油的处理能力,选择退役的选择性加氢装置切割塔加工全部催化裂化汽油,切割所得轻汽油前往脱硫醇装置进行处理,切割所得重汽油进吸附脱硫装置脱硫加工,两股汽油再在罐区混合。……
