製焦汽油加氫處理工場製程改善與探討

延遲結焦法是將真空塔底油裂解以生産柴油很好的方法之一，但其同時也産出部份的製焦汽油，製焦汽油的特色爲焦粉多及含有消泡劑裂解的矽化合物，操作設計及管理不佳時，常會使油中含水、銹蝕以及製焦汽油終沸點高等問題，造成製焦汽油加氫處理工場很大的困擾；經由加裝磁石過濾器吸附銹蝕，採用大孔洞觸媒吸收焦粉，改善差壓；最後增設中間油槽，改善含水量；增加吸附矽的保護床觸媒，以吸附消泡劑裂解的矽化合物；更換高活性觸媒，加氫脫硫效果提升，改善終沸點過高問題，但也提升加氫飽和的能力，犧牲了部份的辛烷值；第二反應器上媒床增加觸媒量，下媒床分散盤的改善，使油料的流態分布均勻；經改善後，在製焦汽油終沸點僅微降下，第二反應器進口溫度由原來的 280~290℃降低至260℃，煉量由原來的2,000 bbl/day提昇到3,100 bbl/day，產品油硫含量由原來的l,000ppm降低至約1ppm。

關鍵字

製焦汽油；加氫處理；觸媒矽中毒；磁石過濾器

並列摘要

Coker naphtha from delay coker plants is one of the most difficult feeds to process in hydrotreating systems. This feed is not only a highly olefinic naphtha with high sulfur and high nitrogen, but also it contains many contaminants. (iron corrosion rust, coke gum, water, metal, ... etc). These contaminants cause high reactor pressure drop, which results in low throughput for the coke naphtha hydrotreating unit in KOR refinery. The reactor pressure drop problems have been solved by adopting the following treatments before the feed enters the reactors: (1) iron corrosion rust removal by using the designed permanent magnetic type filter, (2) coke and gum removal by adding macro-pore catalyst on the top of the reactor bed and (3) water removal by building a setting tank. In order to produce low S、N and metal contents of the products, the Si-guard catalyst is used to completely pick up the silicon contaminant in the feed from the anti-foam used at the delayed cokers. The high hydrotreating performance is achieved by means of the following methods: (1) choosing high activity catalyst, (2) loading more catalyst in the second reactor and (3) changing high efficient mixing device in the quench zone of the second reactor. The following results indicate that the coker naphtha hydroprocessing operation in the KOR refinery has been substantially improved: (1) reduce the inlet temperature of the second reactor (from 280℃~290℃ to 260℃), (2) raise the throughput of the unit (from 2,000 bbl/day to 3,100 bbl/day), (3) lower the sulfur content of the products (from 1,000ppm to 1ppm) and (4) prevent the reactor pressure drop problem.

並列關鍵字

Coker Gasoline ； Hydrotreating ； Catalyst Silica Poison ； Magnetic Filter

國際替代計量

製焦汽油加氫處理工場製程改善與探討

全文下載

主題瀏覽