External heat flux fluidization air problem
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The external heat exchanger is not equipped with a booster; can the main air be used to create the large and small circulatory flows for external heat extraction?
My unit uses a downflow type of external extraction; the booster pump stopped working once. Using main air instead leads to poor fluidization. I think an upflow type would not work better either – the main issue is insufficient pressure, and it’s also not advisable to use raw materials that are too heavy or large in size. In terms of design, it’s sufficient to have a booster pump in operation; some systems indeed do not have such a booster pump, but this is certainly because it has been thoroughly considered that there will be no issues with the heat extraction load resulting from fluidization.
What are your regeneration pressure and main fan outlet pressure? Can the main wind flow enter the external heat extraction fluidized air? Once my unit starts operating, external heat removal air cannot enter due to fluidization.
In my design, the main air is used as the airflow for sleeve fluidization, but in the modified process we still use pressurized air
The outlet pressure of the main air blower is 0.3 Mpa, while that of the regenerator is 0.25 Mpa. There is a process in which main air is supplemented by pressurized air. After the booster compressor stops operating, unpurified air must be introduced to clear the system before main air can be fed in. The external heat storage capacity is over 50 tons; however, fluidization is poor and heat removal efficiency is inadequate. This system is only used in emergencies – it has been utilized just once. Additionally, there is one spare booster compressor available
The old unit’s sleeve has always used pressurized air; it was shut down once, which caused a disruption in fluidization
The pressure is insufficient, and there are safety hazards. A booster should be installed to draw in air separately.
Definitely not. External heating would destroy the bed
I support the idea that the pressure is not sufficient, and there are safety hazards. A booster should be installed to draw in air separately.
Many units indeed do not have pressure boosters and use unfiltered air as a substitute, but this also has its disadvantages. The full name of catalytic cracking is fluidized catalytic cracking; thus, it makes sense to put “fluidized” at the beginning; otherwise, things would get confusing.
Why use pressurized air? It is needed to increase the pressure in order to fluidize the catalyst.