Analysis of the causes of loss in catalytic cracking CAT

1. Reasons related to the catalyst itself. If there is too much fine powder. 2. Equipment-related reasons. For example: the installation angle of the flap valve is out of range, and the valve plate and contact surfaces of the flap valve are worn due to erosion by the catalyst, resulting in poor sealing. 3. Operational reasons. For example, the linear velocity at the inlet of the low-velocity separator is below the critical value when the main air flow is low; the catalyst is damaged due to overheating of the regenerator; there are large pressure fluctuations between the two reactors; the catalyst is damaged as a result of steam containing water; the flap valve operates between the dense-phase bed and the dilute-phase state; the material leg is blocked by coke particles or leaks due to erosion by the catalyst. 4. Instrument issues. For example: sudden failure of the double-acting slide valve to stay closed, inaccurate indication of the regenerator’s storage capacity