Is backflow measurement feasible?
Thread Content
The catalyst regeneration section of the continuous reforming unit uses a UOP process package, and the flue gas flow rate is measured using orifice plates. Shortly after operation began, high temperatures caused by catalyst dust in the flue gas led to coking and blockage of the pressure measurement points. After the New Year, maintenance work was carried out; the pressure tapping point was opened, but it became blocked again half a month after operations resumed. Repeating this three times still does not solve the problem. Drawing on the method of using backblown nitrogen to measure differential pressure, I plan to introduce nitrogen into the positive and negative pressure ducts of the flue gas exhaust flow meter. By applying the \"principle of constant flow at critical compression ratio\", I will measure the differential pressure before and after the orifice plate in order to determine the flow rate. The continuous blowing with nitrogen will help prevent coking and blockages at the pressure measurement points. There are no precedents to refer to. Does anyone have successful experience in doing this?
As long as it is allowed for the backflow medium to enter the system and the backflow flow rate is properly controlled, there will be absolutely no problem.
I also think it’s feasible; positive and negative pressure combined with a orifice valve, and as long as it has no impact on the reaction system, it should work
Bro, precision doesn’t need to be that high; it’s fine. Don’t worry.
The measurement of backflow air in catalytic devices is a common practice that is widely used; all that is needed is to control the backflow flow rate properly. For flue gas media, using instrument air for backwashing should be fine; it is necessary to confirm this with your process engineering team.
For UOP catalyst reforming, it is necessary to control the oxygen content; if nitrogen is to be used, that is the only option available.
It is possible; we use nitrogen backwashing here.
In my opinion, this measurement point was not installed in accordance with the UOP installation diagram. Or there were mistakes during the transition of the design institute. Refer to the original UOP documentation (there must be detailed instructions for this test point) and review the installation requirements.
Sure, for our original exhaust pipe pressure measurement points, nitrogen has been used as a protective gas all along. But we’re not sure if there are any specific pressure requirements for your system! ! This needs attention
I’ve never seen a method for measuring flow rate using reverse blowing; come and learn from it*. Keep tracking the progress, and let me know if the original poster is successful – it can serve as a reference in the future.