Flue gas from the external heat exchanger
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What is the function of the flue gas return line of the external heat exchanger? Why does it get clogged? Where does the flue gas go back to? Are there any pictures?
I’m afraid my knowledge is limited; I’ve never heard of an exhaust gas return line for external heat exchangers. I urgently need those who are knowledgeable to explain this to me. Are you referring to the catalyst return pipe?
It should be the flue gas balance line. Place in the dilute-phase space
The hot flue gas is taken outside and returned to the regenerator’s lean side.
It should be the flue gas return line, which is mainly used to address the issue of poor external heat extraction in fluidization. It is unknown when the blockage issue in the return line occurs during device operation; generally, blockages do not arise during normal production.
This is generally referred to as the flue gas balance line; the fluidization air returns to the regenerator through this line, serving to balance the pressures in the regenerator and the external heat exchanger. In our case, it is located in the two-phase region. I’ve never seen it get clogged; it should generally not get clogged.
This channel should be reserved for the return of the fluidization air from the external heat exchanger, in order to minimize catalyst backmixing. Here, the catalyst is likely in a dilute-phase state; so how could it get clogged?
Yes, of course, the flue gas from the external heat exchanger returns to the regenerator. I don’t have any pictures; the purpose of this return pipe is to carry the catalyst back into the regenerator via the flue gas coming from the external heat exchanger. It can effectively prevent the flue gas from the external heat exchanger from hindering the flow of the catalyst within that external heat exchanger, and the advantage of this is that it enhances the heat exchange efficiency