The reserves of coaxial catalytic cracking have not increased at all
Thread Content
The FCC unit in our workshop required emergency repairs due to tube failures related to external heat extraction. During the inspection, it was found that two tube bundles were leaking; to keep production going, those two tube bundles were removed. After restarting the unit, the inventory level did not increase, but things improved after some adjustments were made. Recently, it was observed that a large amount of fine powder was being generated by the three-spin recovery system, and it is suspected that this is caused by another leakage in the external heat extraction system. That section was also removed, but there was still no improvement. An inspection of the internal heat extraction system revealed that one set of heat extraction tubes there was leaking; those tubes have now been removed as well, and production is being maintained using the remaining three sets. However, the inventory level remains highly volatile, sometimes dropping significantly. What could be the reason for this? The unit is of coaxial design and has been in operation for 10 years. The external heat extraction system is of the type without a drum and separate tube bundles. Visually, it seems that the solid content in the slurry isn’t very high. A major maintenance session is planned for September to replace the external heat extraction system; I’m a beginner, so please let me know what the possible reasons might be
Water in the flue gas does have an impact on the measurement of reserves! It is recommended to check the operating condition after releasing water at the storage volume measurement points.
Now, the areas where heat is lost to the outside and inside have been cut out, and there are no other sources of moisture anymore
If you do it, you can at least rule out one possibility; it has almost no impact on your operations!
Analyze the screening of the balancing agent; if a large amount of fine powder has been generated due to water vapor, even a cyclone is powerless.
I don’t deny it, but in practice, there are indeed signs of water presence!
Is there internal leakage at the valve of the removed leaky tube bundle? The pressure difference between the front and back is high; even minor leaks can cause water to enter the catalyst