Is internal circulation or external circulation better for the external heat exchanger?

Personally, I think an external circulation type would be better! Reason: The internal circulation type may affect the fluidization inside the regenerator; if there is a deviation in the combustion within the regenerator, it can damage the internal circulation tubes, whereas the external circulation type does not have such problems. Looking forward to a more accurate answer:

Heat extractors are divided into internal heat extractors and external heat extractors. They each have their advantages and disadvantages: 1. Internal heat absorber: Advantages: No need for a catalyst circulation and control system, nor for systems such as pressurized air. Simple to operate and requires low investment. Disadvantage: The heat extraction load cannot be adjusted freely. It is difficult to enable it again after disabling it. High material requirements. 2. External heat exchanger: Advantages: The heat extraction load can be adjusted as desired, and it is easy to shut down or start up. Disadvantages: It requires additional catalyst circulation and control systems, as well as a dedicated booster to supply the air pressure. It is complex to operate and requires large investment. Despite the shortcomings of external heat exchangers, they still have a future for development compared to the drawbacks of internal heat exchangers. Currently, the external heat extractor has essentially replaced the internal heat extractor.

Upstairs, what I’m talking about is the external heat exchanger – it’s just the way it circulates, whether it’s internal circulation or external circulation I’m not quite sure what you mean

The external heat extractor uses an external circulation tube, and I believe it has two advantages: 1. The range of adjustable heat extraction amount is relatively large. 2. Good operational flexibility. Based on the heat extraction load, during periods of low load, full-mix recirculation operation can be employed, without using the external circulation pipe for heat extraction. Under high load conditions, heat is extracted using the external circulation pipe, while mixing back operations are reduced to ensure the proper operation of the external circulation.

I agree with what was said on the 3rd and 5th floors; currently, internal heat extraction is basically not used in the design of catalytic units in China. The heat load is difficult to adjust, and problems tend to occur at high temperatures, requiring shutdown for repairs.

What do internal circulation and external circulation of the external heat exchanger mean?

Oh, when an external circulation tube is used, mixing back also occurs. Does the occurrence of mixing back during external circulation pose a problem for operation? Could it lead to other accidents related to heat extraction? Will it have an impact on the regenerator and the external heat exchanger?

In my personal opinion, an external loop is a bit better

It uses air-controlled external circulation. . . It is called an external heat extractor. . . The use of an external heat exchanger allows for an increase in the internal volume of the regenerator, thereby increasing the amount of catalyst that can be stored and enhancing the regeneration capacity. . . It also enables good detection and handling in the event of a leak in the heat extraction coil, thereby minimizing damage to the catalyst caused by steam and water. . . :Lol, therefore it is recommended to use an external heat exchanger as much as possible. . . The technology is now highly mature. . .