Solutions for hot spots in the two units of catalytic cracking
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I have a question for the experts: a 1.2 million-ton catalytic cracking unit using the MIP-CGP process, with a parallel high and low-pressure catalytic cracking configuration, and oxygen-enriched regeneration in a pre-heating coking tank. The hotspots of these two devices have always been long-standing issues that attract significant attention and pose constraints on long-term operation. Our hotspots are mainly concentrated on the raw material circulation pipes, recycled material circulation pipes, vertical pipes for external circulation, and pipes for external heat extraction. The packaging box is now completely damaged; I’m very worried about this device. Does anyone else have a similar device that doesn’t have hotspot issues? Feel free to share your experiences and methods for adjusting the operation parameters. Additionally, feel free to engage in in-depth discussions; QQ: 531235360. We have tried adjusting the relief valves, flow control valves, pressure settings, and storage volumes, but no effective solution has been found. Furthermore, when we reprocess lightly contaminated oil, does the change in the composition of the contaminated oil have an impact on it, and to what extent? How to evaluate it? If there is a change in the circulation volume, it has an impact, that’s known; but how great is that impact? Please advise, expert! Full of gratitude.
To put it more clearly, it’s not very specific
It is a quality issue with the lining. Local repair of the lining is generally not supported, as the results are poor. Therefore, when starting the lining construction, great attention must be paid to quality; from the use of turtle-shell mesh to the manual tamping of the lining, it must be done in a thorough and compact manner – no carelessness is allowed, otherwise hot spot problems will arise.
Construction quality issues are also a possibility, but we have already implemented strict controls over construction quality. Waiting for the major maintenance in 14 years.
Local lining repair is not recommended; I understand that. Do you have any better solutions? In addition to the overall replacement of the inclined tubes.
It’s similar for us as well; the focus is mainly on the inclined tubes, and iron sheets are used to cover various parts there. The lining is provided by the manufacturer, which makes things difficult. Let’s keep it as it is for now, and fix it properly during the maintenance
This is so frustrating; things haven’t settled down today either – four more boards had to be installed. The inclined tubes are all covered in patches. Don’t you guys have any good solutions either?
:):) The hot spots are mainly related to the construction quality and the original lining.
Ours too, but we replaced all the J-tubes this year