A 4-day emergency repair effort for a faulty high-pressure coal slurry pump
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This post was last edited by tfx511024 on 2016-3-9 at 18:14. It deals with the emergency repair of a high-pressure coal slurry pump that took 4 days to resolve. By writing about this incident, the aim is to provide a subject for analysis and discussion; it serves as a case study of a problem that has already been solved, allowing everyone to consider similar situations again The following is the main text, which also serves as background information for everyone’s reasoning. Since reasoning is involved, some of the analyzed situations will not be explained here; they will be revealed one by one during the reasoning process. Background information: One day, a failure in the drum water circulation pump caused a cascade shutdown of one gasification furnace; once the issue with the circulation pump was resolved, the system was restarted. The furnace was operating normally, and preparation was underway to feed material in. It was then discovered that the pressure at the hydraulic end of cylinder #3 of the high-pressure coal slurry pump was zero, while the other cylinders were functioning properly. The pump was therefore stopped for maintenance; upon disassembling the cylinder body and diaphragm, it was found that the guide rod of the diaphragm had bent. There is slag on the inlet check valve. —— To ensure an exciting simulation, please leave comments! I will reveal it at the right time.
Background information: The shutdown was caused by a pump failure; after the pump issue was resolved, material feeding began, and it was found that the pressure at the hydraulic end of cylinder #3 of the pump was zero! Wasn’t the high-pressure coal slurry pump repaired?
It refers to the shutdown caused by a fault in the drum water circulation pump
The pressure at the hydraulic end is zero. How was this determined? Is there a pressure gauge?
I made a rough inference; I’m not sure if it’s correct: First, the cinders caused the check valve to stick, which in turn led to uneven movement of the diaphragm. This resulted in the bending of the guide rod, and once the guide rod bent, pressure built up on the hydraulic side. Eventually, due to this high pressure, the relief safety valve opened, causing the pressure to drop to zero.
Please specify which check valve? How unstable is the itinerary, and in what ways is that manifested? Your analysis of the guide rod bending is incorrect.
The issue with the imported check valve being stuck and having unstable stroke is mainly manifested in terms of flow rate. So what is the reason for the guide rod to bend? I would like to ask for advice
Indeed, it was a stuck inlet check valve that caused the leakage, resulting in no pressure at the hydraulic end of the slurry pump. Due to leakage and the absence of pressure at the hydraulic end, the guide rod does not undergo any significant displacement. The reason for the guide rod bending is electrical; think about it again!
I have some basic knowledge of equipment, but I really can’t think of anything related to electricity.:Q
Which guide rod is bent? Does it correspond to the stuck check valve?
Yes, it corresponds to the cylinder with the cartridge valve