Pressure drop of the settler
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In the settler, the rough spinning pressure drop decreases, while the single spinning pressure drop increases. I would like to ask what causes this phenomenon?
The decrease in the pressure drop in the settler is caused by factors such as a reduction in the reaction feed rate, a decrease in the reaction depth, a reduction in the linear velocity at the outlet of the riser, and a decrease in the reaction pressure； But the single-spin voltage drop increases; I don’t understand what the original poster means.
The processing volume remains unchanged, and the other injection media have also not changed.
Do your settlers have anti-coking features? If so, are there any issues from that perspective (such as in terms of structure or parameters)?； If not, starting from the change in pressure drop, it should be that the pressure in the negative-pressure chamber of the coarse spinning process increases, that is, the pressure in the positive-pressure chamber of the single-spinning process rises. Possible reasons include: 1. There is backflow of steam in the feed leg of the coarse spinning process ； (Suggestion: Increase the inventory in the stripping section.) 2. If it is a flexible connection, it could also be caused by an excessive amount of stripping steam ； 3. Poor discharge at the lower part of the coarse spinning leg ； (This is less likely.) 4. Then there’s the possibility that it’s a problem with the instrument ； Do you experience any slippage, and what is the solid content of the slurry?
The solid content of the slurry has remained practically unchanged. However, the current problem is that the pressure drop in the primary spin dryer has increased significantly (above 3 kPa), while the pressure drop in the secondary spin dryer has stayed roughly the same; moreover, the dilute-phase density in the settler has also not changed. What could be causing this? 〉 This post was last edited by crocodile1981 on 2009-4-10 18:12 ]
It cannot be determined solely based on pressure drop analysis; it is likely that coking has occurred in the rough spin-up gas pipe.
The rough spinning pressure drop has increased significantly! There is also no significant change in the reserves in the settler
Maintain the normal processing volume essentially unchanged
The reaction depth decreases, and the catalyst circulation rate is reduced. Or the properties of the crude oil become lighter.