Filter press feeding issue – urgent
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Hello, dear sea friends! The current plate and frame filter press system in the workshop is used for the solid-liquid separation of the solution resulting from the neutralization of phosphoric acid with calcium carbonate. Recently, we encountered a problem: the operating sequence of the filter press involves closing the plate and frame frames, feeding material, and then squeezing. Each time during the feeding process, the current drawn by the feed pump is about 10 units lower than normal, preventing the material from being fed in. No abnormalities were found upon checking the equipment ； The approach is to manually restart the program, that is, first open and then close the plate frame – feed it in; the current of the feed pump is 55-60, which is normal ； In other words, the feeding process has to be carried out manually twice each time, which is inefficient ； I would like to ask the experienced sailors here why this happens, what the reasons are, and how it can be resolved! Thank you!
Check to see if the pump starts after the signal is given. It is initially suspected that there is a problem with the pump’s starting circuit; further verification is needed
Hello, the pump operates once a signal is given. The current consumption of the feeding pump is normal, at around 55-60, while the current when trying to feed material is only about 10; it seems like the pump can’t draw in any material and is running idly (when the bottom of the tank is blocked by a sleeve, the motor’s current also stays around 10). However, the secondary feeding process works normally；
It seems there is air entrapment in the feed pump; check if there are any issues with the exhaust
It seems there is air entrapment in the feed pump; check if there are any issues with the exhaust
Thank you, we suspected that as well; if it’s caused by gas binding, how can it be resolved?； The pump inlet is connected to the material buffer tank (with agitation), but the tank is full, so no air will be drawn in; it’s a direct connection ； The outlet is directly connected to the filter press inlet, also via 304 pipes ；
The issue with selecting a feed pump for a filter press may be related to pump clogging or other problems
After each feeding operation, is the pipeline and pump flushed with water? If not, could residual slurry have solidified within the pipes, affecting their fluidity?
Yes, one cycle of the filter press system consists of closing – feeding – pipeline flushing – squeezing – air drying – unloading. However, pipeline flushing only involves cleaning a section of the pipe at the filter at the filter press inlet; the pipe from the pump outlet on the first floor to the feed filter of the filter press (on the second floor) is not cleaned ； Logically, with a 5m liquid level difference in the pipeline, no gas will enter the pump. I’m not sure if installing a check valve at the pump outlet would help, but I’m also concerned about the issue of blockages; I don’t know how to address that How do I upload pictures? I’ll upload some pictures for you to see ；