The catalytic regenerator increases the superheated steam from the internal heat extractor for stripping
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The workshop is considering technical upgrades, specifically the addition of an internal heat extractor to the catalytic regenerator, in order to use steam at a pressure of 3.8 MPa or 1.0 MPa for catalyst stripping. Are there any companies that have implemented this? How is it working? Could you explain the process? Please help
Steam superheating as stripping steam is no longer a new technology. The general process is as follows: 1.0 MPa of fluid enters the internal heat exchanger, and after being heated there, its temperature rises from 260°C to 440°C, serving as the vapor for stripping at both the top and bottom of the lift column.
Internal heat extraction has already been used a lot
It can be implemented as long as there is space in the regenerator; technology is not an issue. Many catalytic devices have them.
There are quite a few problems associated with the use of internal heat exchanger devices; most of these are related to wear and leakage. This is mainly because the presence of the internal heat exchanger affects the flow of the catalyst and flue gas, leading to the formation of vortex areas in those areas!
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May I ask again, should the superheated coil be placed in the dilute phase or the dense phase? Thank you
It is not only used for stripping; superheated steam yields better results at the backwashing point.
The steam and heat are converted into superheated steam through heat transfer tubes; this superheated steam is then sent to various steam-consuming points after being buffered in the drum. The process is not complicated; it’s just that the heat transfer tubes need to be properly designed.
Placing it in the dense phase, I understand this as increasing the heat transfer to the catalyst in order to prevent catalyst erosion
Ours is in a dilute phase, as this doesn’t require very high temperatures; we keep it at around 360 degrees here, and that’s already superheated steam