Diesel pipeline blockage
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Do the fuel return lines in the heavy oil catalytic cracking unit get clogged? What is the medium that is blocked? How to handle it?
I have experienced blockages in the past; the exact cause is unclear. Looking back, the main reasons can be summarized as follows: 1. There is a high amount of diesel gum, which results in a slow flow rate. Over time, this leads to blockages in the pipelines, and this problem occurs more frequently in winter. Such situations can be identified from the pipelines you cut or from what is discharged during subsequent purging. 2. Willingness to introduce the catalyst into the pipeline. 3. Other human factors. Personal opinion.
We have never encountered blockages, but one winter there was an emergency shutdown due to the freezing of the fuel lines. The pipeline, which was over 200 meters long and 50 centimeters in diameter, didn’t have any insulation, and despite trying to clear it with steam for two days, it wasn’t possible; this even caused a delay in resuming operations. If there is a blockage, it may be due to the pipeline not having been thoroughly flushed before use, or due to the presence of corrosion products and other residues; in such cases, disconnect the flange at one end and try cleaning it with steam at the other end.
:Loveliness: I’m sorry; I drank too much alcohol and didn’t explain how it was handled. Actually, whenever there’s a blockage, it’s very difficult to deal with it. During that power outage, production had to be resumed, and since the temperature of the bed was low, it was necessary to spray burning oil :Q I was extremely worried – it wasn’t possible to spray the oil, so I had no choice but to turn on the furnace. Even trying to use alternative methods didn’t work :L In the end, for some reason, things worked again; probably there was a layer of scale inside, and when the pressure increased, things became unblocked. It was pure luck. Later, measures were put in place, and the process was modified so that the return lines are connected as close as possible to the nozzles. Regular inspections are also carried out to avoid problems arising later. It was really stressful, haha:P
Even using a high-pressure pump to reach 5.0 MPa here doesn’t work; we just haven’t had this line for over 3 months.
It’s not blocked; it’s frozen. By moving the return line to the nozzle, it won’t freeze