Why does oil cause coking in the system?
Thread Content
1. Properties of the slurry 2. Bottom temperature of the tower 3. Flow velocity of the slurry in the pipes; everyone is welcome to add more information
High viscosity, lots of catalyst impurities, high density!
The cyclone separator in the settler has poor separation efficiency; it retains too much catalyst, and the circulating amount of slurry oil is too low； The external slurry flow is too small ； The stirring steam at the bottom of the tower is not turned on or is insufficient, resulting in a dead zone at the bottom of the tower.
The main reason is likely the properties of the crude oil. Recently, our plant processed a batch of heavy oil with a density of around 93. As a result, the entire slurry system was affected; the solid content in the slurry reached as high as 400. Consequently, we had to shut down operations