Catalytic feedstock oil feeding?
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Since the control valve for the catalytic feed oil is fully open under normal operating conditions, the feed oil pump stopped automatically after one minute due to overcurrent. Can the crude oil pump be started directly, the control valve opened, and fuel injection on the feed line initiated? Please discuss it. Precautions during operation. Important parameters. Weigh the pros and cons.
I adjust the opening degree of the feed control valve in my system according to the composition of the raw materials and the production plan. I would like to ask fellow professionals: how does one adjust the processing volume when that control valve is fully open?
Friend, please read the question and the supplementary questions carefully. It is because, under normal operation, the raw material feed control valve suddenly opened fully. One minute later, due to a sudden increase in the flow rate of the feed material, the feed oil pump experienced overcurrent and stopped operating automatically! Is it possible to directly shut off the control valve and switch to a bypass valve, thereby starting up the backup feed oil pump? Starting to inject fuel? Please discuss the precautions to be taken during operation. Important parameters. Weigh the pros and cons? Currently, we operate the valve position at around 55-60.
Generally, as the reaction feed rate changes from normal to maximum levels and then stops, the operating conditions of the reaction will also experience significant fluctuations. At this point, the low-flow protection for the reaction feed should already have been activated; it is not advisable to rush to feed material. One should wait until the fluidization becomes stable and normal before resuming operations. If the control valve fails and needs to be repaired, a bypass line can be used as a control method, but adjustments must be made with caution.
Personal opinion: After catalytic feed interruption, it is easy to resume feeding prematurely. Over time, both pressure and temperature balances have to be re-established, and the operation of the rear waste heat boilers and distillation stabilization systems becomes chaotic, which is time-consuming and labor-intensive. If the pressure balance can be maintained after the pump stops operating, and the temperature of the regeneration bed is still high at that point, it is very easy to resume feeding with minimal impact on the entire system.
It was only after the control valve was fully opened for a minute and the pump stopped working that it was noticed – this operator is really unqualified! When the feed pump fails, the operator must definitely reduce the flow rate at each feed control valve (this is very important). As the person mentioned earlier, it seems that the control valves cannot be operated manually; in that case, switch to remote control. Restoring feed supply as quickly as possible is the top priority!
Of course, feeding should be resumed as soon as possible; the longer the feeding is interrupted, the more difficult it will be to get things back on track
The person on the sixth floor didn’t read the instructions carefully; the control valves suddenly opened all the way, causing instrument failures. Can the operator on site take control of the situation? Also, I mentioned that the feed oil pump experiences overcurrent and shuts down automatically. Is it possible to directly disconnect the control valve and use a bypass valve instead, in order to activate the backup feed oil pump? Starting to inject fuel? Please discuss the precautions to be taken during operation. Important parameters. Weigh the pros and cons? Share your reasons.
If it’s just one minute, in my opinion there’s no major issue with resuming feeding promptly; one just needs to pay attention to a smooth transition of the parameters during operation, and having an awareness of advance adjustment is sufficient! Also: Is there no limit device installed on the crude oil control valve? The kind that prevents large fluctuations?
It depends on the riser temperature and fluidization conditions to decide whether to feed or not.
Of course, it is necessary to restore the feeding system via a bypass as soon as possible, but before that, it is required to check whether the parameters of the two reactors are normal – that is, whether the safety systems are functioning properly, as well as whether the catalyst flow state in the two reactors and the pressure difference between them are within normal ranges. Normally, restart feeding once again