The catalytic cracking reaction is sluggish
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Our unit’s reaction section has recently seemed to respond slowly: when the slide valve is opened, the reaction temperature rises very gradually; when the reprocessing slurry is introduced, the bed temperature increases slowly as well, and tail burning even occurs at the rear. Additionally, tail burning takes place at the rear whenever the bed temperature drops slightly. Why? I need to consider things from certain perspectives; please help analyze the reasons, fellow sailors.
1. Low regeneration temperature 2. Is proportional integration not appropriate? . 3. Has the processing volume of raw materials been set too high? 4. Pressure balance. 5. Main air distribution
It seems the burning isn’t proper; could it be that the fluidization in the regenerator is inadequate? Is the carbon content of the regenerating agent too high? Is the condition of the regenerator’s inclined tubes normal? To prevent incomplete combustion, it’s necessary to add a combustion accelerator
1. Low regeneration temperature ； 2. The processing volume of raw materials has increased too much ； 3. Pay attention to the oxygen content.
1. If the reaction temperature is under automatic control, the PID parameters may be inappropriate； 2. The circulation volume of the possible regeneration line may be limited ； 3 Low regeneration temperature ； 4. The dense-phase inventory in the regenerator is low.
Has the catalyst activity decreased due to imbalance? Take a sample for analysis.
The rise in reaction temperature when the slide valve is opened is slow; one factor to consider is whether the regeneration temperature is low, and another is the pressure balance between the two vessels as well as the material flow through the inclined tubes (to determine whether the steam or air used to loosen the inclined tubes is appropriate). It is essential to ensure that sufficient catalyst enters the reactor after the slide valve is opened. By adjusting manually, it is possible to determine whether the proportional-integral control is appropriate. When the material is sent back to the refinery slurry, the bed temperature rises slowly; the reason for backburning at the rear may be insufficient main air flow, resulting in incomplete combustion of CO in the dense-phase bed.