关键词: 催化裂化, 油浆净化系统, 过滤器, 滤渣组成, 高价值馏分, 细颗粒含量, 平稳高效运转

Abstract:

The filtration slurry purification technology has a development history of nearly 40 years, but the problems of filter frequent switching and cannot run for a long term have not been solved. It is proposed that the enrichment of “agglomerates” formed by catalyst fine particles and colloid/asphaltene in slurry is the cause of mutational site of pressure drop of the filter and easy to cause plugging. Based on the existing filtering equipment, it's the first time of the slurry purification system was developed by improving the properties of the slurry, and the industrial application technology schemes of slurry purification system + filter and slurry purification system + settling tank + filter were formed. The industrial application results show that the annual output of tricyclic and tetracyclic aromatic hydrocarbons increases from 19.3 kilotons to 30.5 kilotons, with an increase of 58.0%. The operation time of the filter is increased by more than 2.5 times, and the washing time is controlled within 5 minutes. The system can operate for a long period, meeting the requirements of the downstream device for particle content. Adopting the scheme of slurry purification system + settling tank + filter, the content of catalyst particles can be controlled steadily below 5 μg/g, meeting the strict requirements of slurry utilization. The slurry purification system has completely solved the above problems and realizes the efficient removal of fine particles of slurry catalyst.

Key words: FCC, slurry purification system, filter, filter residue, high value fraction, fine particle content, stable and efficient operation