Level detection challenges encountered

You’re really good at handling manufacturing processes; when you can’t solve a problem on your own, you resort to using instruments to measure the level of liquid in the vertical pipes. That’s really not proper practice – such people should be laid off. Suggestion: Add ventilation and drying during the discharge process, with sufficient wind force. For specific equipment selection, consult the specialists in process equipment, as heating and drying the pipes at the outlet can further reduce moisture content. Our company doesn’t produce resin products, but we work with powdered materials as well, and practice has shown that this approach works!

That’s not good; the centrifuge and the vertical pipe are connected, and below the vertical pipe there is a screw conveyor. What you mentioned is impossible to achieve, but thanks anyway!

Try to measure the density of the medium using the backflow measurement method (differential pressure transmitter); the density is different during normal transportation and when the material is piled up

Just install a vibration motor on the pipeline, that’s it

The outlet pipes of centrifuges are usually quite large; the gate valves used there must be of DN600 or larger, with screw conveyors connected directly to them； The centrifuge can separate the materials (and \"push\" them to the solid phase outlet); the rest is a matter of the accompanying process design, which isn’t proper. There are experienced process professionals on the forum who specialize in centrifugal separation; they are very enthusiastic. Go and ask them for advice, li*nji. His post: http://bbs.hcbbs.com/viewthread.php?tid=68419&extra=&page=1 Process issues and their solutions – if instruments are used for measurement and the results are still inaccurate, isn’t that going around in circles?

The outlet pipes of centrifuges are usually quite large; the gate valves used there must be of DN600 or larger, with screw conveyors connected directly to them； The method is correct. I don’t know what type of centrifuge you are using; if it’s a continuous centrifuge, a feeding scraper can be added, the vertical tube can be made larger, the inner surface of the vertical tube can be polished, and dry air can be introduced. There are many solutions available, and specific considerations need to be taken into account

I believe that level measurement is not effective in such situations; it is recommended to use a differential pressure transmitter to measure the pressure difference between the inlet and outlet. If this pressure difference exceeds a certain value, it indicates that the pipeline is blocked, and the interlock should be activated immediately.

Just install a level switch; I don’t know what the diameter of the vertical pipe is The installation pipe should have a large diameter; it is advisable to use swirl-type sensors. There are also radio frequency admittance, radar, and capacitive types – different measurement principles, but all of them can be used for this purpose. For long-distance transportation, it is best to suspend the resin powder in an air stream before transporting it; it would be good to provide detailed procedures for this process, so that instrumentation technicians can handle such issues. Are your instrumentation engineers just slacking off? They should go and learn something*

Take a simple example: for the water supply and drainage in our own homes, if we turn the tap on to full volume, the drainage pipes won’t be able to handle the flow of water – so what’s the point of conducting any tests? Automation replaces the operator’s hands and eyes, but it is not omnipotent; there are tasks that even automation cannot handle, and when it tries to take over such tasks, it only ends up making a fool of itself. Each start-up and shutdown of the centrifuge often takes more than 60 minutes in total. Even if your testing equipment is highly accurate, what’s the point of frequent start-ups and shutdowns? Has the blockage problem been solved? What was discussed above were all methods for directly solving the problem. Hehe, including the phenomenon encountered by the original poster, I seem to have experienced them all. In the projects I was involved in before, I ran into: 1. Three cameras, and the oil drainage pipes were too narrow, so the oil couldn’t be drained out ； 2. Two cameras: the liquid phase (water) flows under gravity into the drain; the design of the pipes leading to the drain is too small, resulting in backflow ； :Lol, plus the solid phase of the OP is also blocked; it’s all done. Carelessness exists everywhere; it is only when problems arise that the value of experience becomes apparent.

It is possible to measure from a different perspective: the screw conveyor can be converted into a screw conveyor metering device by installing weighing sensors and a set of instruments to enable measurement. Alternatively, an observation window and photoelectric sensors can be added to the vertical pipe.

Try installing an ultrasonic flow meter and see. :)

As I recall, the connection between the discharge port of the centrifuge and the vertical discharge pipe should be a flexible one; the process of blockage does not occur as quickly as you said. It is possible to determine whether there is a blockage by checking the current flowing through the motor of the screw conveyor as well as listening to the sound produced by it. There is no need to take risks with the vertical pipe – if a blockage occurs, it will start from below the screw conveyor. Therefore, I think it’s sufficient not to use any level measurement devices; if such devices are needed, then the methods mentioned earlier can still be used, or an external level gauge could also be considered.

It seems there’s no need to press the level gauge. We use differential pressure detection to prevent blockages in general. But first, I’d like to ask: is the probability of obstruction occurring due to the situation mentioned by the original poster high? It doesn’t seem easy to get blocked.

Is it possible to use a method of enlarging the pipe diameter? For example, if the pipeline designed for the Buddha-style vertical pipe is DN600 and 3 meters long, could the DN600 pipeline at the centrifuge outlet be made as short as possible? If the DN600 pipeline is 0.5 meters long, then the remaining 2.5 meters can use DN800 pipes. In this way, the DN600 pipeline is less likely to get clogged, and the DN800 pipelines are also less likely to get clogged (since the contact between the material and the pipe wall is reduced after the diameter is enlarged; moreover, a shorter DN600 pipeline is also less prone to clogging). I’m not sure whether this method is feasible! :handshake

Adding a screw conveyor section to the vertical pipeline completely solves the problem.

Can the air hammer be set to strike automatically on a timed basis?

Thank you all for your active participation. I am very sorry for not being able to communicate with you in a timely manner as I have not had internet access recently. Actually, these are the process and control requirements designed by foreigners; regarding this issue, I also think that considering it purely from a control perspective is unreasonable. My idea is to increase the cross-sectional area of the vertical pipes from a technical standpoint, or to add process buffer tanks, as well as to implement additional monitoring methods for early accident detection. Thank you all for your participation and the valuable suggestions you offered.