Regarding the 350-degree distillate of the oil slurry
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May I ask what level the fraction with a temperature below 350 degrees in the oil slurry is controlled at? What should be done if it is high? What is the basis for this operation?
Here, since the slurry pump uses diesel as the sealing oil, the fractions below 350 degrees are very high; I’m not sure if diesel is used as the sealing oil where you are. The control of the 350-degree fraction relies mainly on regulating the amount of slurry returning to the tower as well as the amount of reprocessed oil returning to the tower; furthermore, improving the control criteria for diesel at 95 degrees helps to reduce overlapping components
We use reduced-pressure paraffin oil as the sealing oil here
Mid-stage oil can be considered as a sealing oil.
We have steam supplied for stirring at the bottom of the tower, about 1.8 tons
It can be considered sending it back to the crude oil tank for reprocessing.
Is it all heavy oil catalytic cracking these days? Is there still any reprocessed oil slurry?
We are no longer reprocessing either our oil slurry or recycled oil; reprocessing leads to the formation of coke. The fractions before 350 degrees depend mainly on how you control it, or on the diesel quality standards set by your plant. Ours is generally 3-6.
Could you tell me about your place?
:$ It’s a local refinery; haha, it’s a small factory, so I can’t say much:P Good luck to you
The fewer components in the slurry before 350, the better – this is something everyone knows. . . But if it is too low, it affects the composition and density of the slurry, making it prone to coking at high temperatures. . . Therefore, reasonably determining and controlling the proportion of the slurry before 350 is an empirical value; for us, it should not exceed 10%. . . . It’s too high; increase the amount of steam used for stirring at the bottom of the tower. . . Well, by simultaneously increasing the bottom temperature by 5–10 degrees appropriately, the problem is basically resolved. . . . :Lol, also make sure the density of the slurry isn’t too high – around 1.01 is fine. . .
In the slurry samples we prepared these past few days, the recovery rate at 350 degrees Celsius was 3%.