Is heat extraction during catalytic regeneration done in a dense phase or a dilute phase?
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Dear sea friends, does heat extraction during catalytic regeneration occur in a dense phase or a dilute phase? Explain the reason
In the dense phase, the phase remains stable; think about times when the bed is stagnant – the heat generated inside doesn’t escape outside the bed layer, and operations still need to continue
Definitely a dense-phase condition; wear in the dilute phase is severe, and the heat transfer tubes are prone to leakage
What was said above is correct; it’s in a dense phase. Heat absorption through direct contact with the catalyst
In the dense phase, you can take a close look at the regenerator during maintenance and then you’ll understand
Internal heat extraction leads to dense-phase superheating; some plants use 1.0 steam in the reaction for dilute-phase superheating
It’s hard to say, dear HaiChuan friends. Our system is used for heat extraction in a dilute phase; steam at 1.0 MPa, after being superheated, enters the reactor
In the dense phase, since heat is removed from the outside, the excess temperature on the bed layer is taken away; heat is obtained through the circulation of the catalyst
Internal heat extraction occurs in the dense phase. The superheater is in the dilute phase section.
It depends specifically on the design of the external heat exchanger and its relative position to the regenerator; there are fully dense-phase designs, such as UOP’s backmixing type； Some heat exchangers are mostly in the dense phase with a small portion in the dilute phase, such as the downflow type drawn from the dense phase of the regenerator.