I’m asking for help again! Does no one know or have experienced it?
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Our continuous reforming plant here has a large unit of one unit with three units! The 3C control system, since the beginning of this spring! The flow rate in one section keeps dropping, the outlet pressure in one section is decreasing, and the outlet pressure in the second section is also dropping! The secondary anti-surge valve closed, causing the steam consumption of the unit to increase significantly; at the same time, the speed of the unit also rose rapidly. Pressure of the control system for this unit. It is currently suspected that the ammonia salts may have crystallized and blocked a section of the inlet filter; I wonder if any experienced members here have better analysis methods or solutions. Please help! Thank you!
In the face of such problems, first eliminate those that can be handled online. The remaining issues can only be resolved by shutting down production; in that case, production must be halted for inspection and treatment. If the crystals can be eliminated by increasing the temperature, it should be possible to remove them online. Another point worth paying attention to is whether the control parameters in the inspection process meet the requirements necessary for equipment production. For reference.
It’s not yet certain whether salt formation has occurred! Just a guess
If there’s no problem with the unit’s impeller, it’s likely an obstruction at the inlet; however, the probability of ammonium salt crystallization in the reforming unit is low
It seems you have identified the root of the problem. Do you think there is a bypass near the location of the blocking device, which can be opened as appropriate? ； Slightly increase the temperature of the incoming stream ； The technical upgrade considers increasing the volume of the pre-compression buffer tank and reducing the temperature before material enters the tank.
Anything is possible. Anything that cannot be resolved during the production process must be stopped and disassembled for inspection. There’s no need to hesitate, nor to draw hasty judgments. A wrong judgment can lead to misguidance in maintenance.
It’s not easy to determine this online; you need to analyze the entire process step by step to see if there is any change in the pressure difference before and after the compressor filter. It’s possible that something is blocking the flow – it doesn’t have to be ammonium salts; it could also be foreign objects. Don’t rule anything out; for example, maintenance gloves or plastic protective covers used in valve installation could be the cause. So, don’t assume it’s ammonium salts just yet
Reduced flow: it could be due to blockages, leaks (internal leaks), or a decrease in the unit’s capacity. Check the inlet filter to determine if there is scaling or if the gap has increased; in such cases, the machine must be shut down for maintenance.
This requires some on-site testing: as the temperature rises, malfunctions occur; either there’s a blockage, or it comes down to considering the service life.