Did the anti-surge valve of the main fan open suddenly?
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Accident scenario handling: What to do in the case of sudden shutdown, partial operation, or full operation of the coaxial catalytic main fan?
Depending on the duration, it once flared up; it was shut down immediately upon detection within a few seconds, so no material cutting occurred – only fluctuations in the reaction were caused.
Agree with the opinion above. If detected in time, it can be saved.
It’s not a big problem to turn it slightly open and then switch to manual shutdown to prevent surge; however, if it is opened fully and then shut down immediately, oil from the catalyst can be carried under pressure to the regenerator, leading to accidents. It is necessary to act according to the actual situation – in the case of a coaxial type, when the pressure in the standby riser remains high while the regeneration pressure drops too rapidly, the standby slide valve should be shut down promptly to prevent reactions caused by insufficient pressure and the presence of oil. Attention must also be paid to the risk of a decrease in catalyst circulation volume and a sharp drop in reaction temperature due to insufficient driving force. In any case, if the fluctuations become uncontrollable, automatic safety measures should be activated immediately. In the case of a parallel high/low configuration, basically only the main air supply’s automatic safety features can be used, otherwise serious problems are likely to occur.
Yes, it also depends on the time; self-preservation is the most important thing