Heavy oil catalytic internal\external heat exchangers
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After the unit is modified, an additional internal heat extractor needs to be installed (using the existing external heat extractor), and natural circulation shall be employed to remove the excess heat. My question is that the internal heat extractor does not have the same level of controllability as the external one; this is not a problem during normal operation. But what about when the unit is in standby mode? The internal heat extractor still removes a large amount of heat, which inevitably disrupts the heat balance. I would appreciate it if everyone could discuss this issue, especially those who are faced with similar situations – please share your insights
The internal heat exchanger is indeed not as easy to adjust as the external one, and there is a risk of leakage; in my installation, a leakage in the internal heat exchanger caused significant loss of catalyst. The internal heat extractor designed by the Luoyang Institute is now placed in the dilute phase of the regenerator to mainly superheat 1.0 MPa steam, and no leaks have occurred to date.
Just as heat extraction from the outside cannot be used to adjust the amount of heat extracted, my installation has recently been upgraded with an internal heat extraction system that generates 3.5 MPa saturated steam. At startup, more combustion oil needs to be injected to maintain the bed temperature; if the bed temperature cannot be maintained during machine start-up, an appropriate amount of combustion oil can be injected.
Thank you to the person above; it’s indeed very troublesome to replace the heat-exchange tubes inside. It seems that the standby unit can also only rely on burning fuel to generate heat:handshake
The internal heat exchanger is indeed troublesome. I have used this setup before; in order to maintain thermal balance, fresh feed is reduced while the amount of oil refined is increased to achieve that balance. It has been canceled now.
By adding an internal heat extractor to your system, it indicates that there is an excess of heat in the regenerator; the existing heat extraction methods are not sufficient, which is why an additional internal heat extractor is needed.