Anti-coking steam and fluidization steam at the bottom of the catalytic riser reactor
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Steam for anti-coking and fluidization injection at the bottom of the catalytic riser? Thank you so much!
What do you mean, it’s not to increase the steam?
There are three paths, and the other one is for raising steam.
The last edit to this post was made by Refiner on 2018-3-15 at 08:44. Anti-coking steam is applied at the feed nozzle, entering the lift pipe together with the material; superheated steam is used for that purpose. The fluidization steam you mentioned is, in my opinion, the same as the lift steam – it enters from the bottom of the lift pipe, where there is a coil inside
It’s not the anti-coking steam for the feed nozzle; where is then the location of the anti-coking steam at the bottom of the riser?
The three streams of steam at the bottom of the riser should be: pre-rising steam, fluidization steam, and backflushing steam.
There is no oil or gas at the bottom of the riser, so coking does not occur
The riser tank vent is equipped with a backflow steam stream to prevent the vent from getting clogged by catalyst. There is also a fluidization steam ring at the bottom of the riser to stop catalyst from accumulating in the dead zone at the bottom. The pre-raising steam in the riser is a pipe that extends about 1.5–2 units inside the riser
In our riser, there is only pre-heating steam available; there is no anti-coking steam, so coking does not occur at the bottom of the riser
At the bottom of the riser, there is pre-lift steam and fluidization ring steam, while there is a small backflow steam at the vent. Previously, lotus nozzles were used for pre-raising steam, but the current design features straight pipes that extend to the upper corner where the regeneration inclined tube and the rising pipe are welded together. The fluidization ring is a tubular ring with nozzles on both the top and bottom, more on the top than on the bottom. The bottom of the riser is below the nozzle, and no feed has been introduced yet, so coking does not occur.