Experts, I need help! Problems with the liquid ring booster pump in the top reduction system. . . .
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The bearing temperature of the liquid ring booster pump in my plant’s top reduction system is quite high; it can reach over 40 degrees after just 10 minutes of operation. This is a problem that has only emerged recently; this system was also upgraded last year, as it previously used three-stage steam vacuuming. Current status: Pump is stopped; non-condensable gas at the top is vented. Solution: The pump was disassembled for repair; the tank and cooler were also taken apart. There was a lot of dirt, but after cleaning, a filter screen was installed at the inlet. It doesn’t work. A constant amount of non-condensable gas is introduced, but there is relatively little of it. It doesn’t work. The theory that is widely accepted now is that the load on the pump is too low; the pump is essentially running idle. Even when it operates at high temperatures, the pressure in the tank (the pressure at the pump’s outlet) isn’t high, around 25 kilopascals, while the pressure at the pump’s inlet is around 13 kilopascals. This is still with the bypass valve set at 30%. The general process involves two stages of steam vacuuming – a liquid ring vacuum pump – a water seal tank; after passing through these two tanks, the first one serves as a water seal with 50% of the water remaining unflowing, while the second one is used for dehydration – followed by a liquid ring booster pump – an alkali scrubbing tower – and finally entry into the furnace. I’m not sure if other refineries have encountered this situation; I hope everyone can contribute their ideas.
The problem is the high bearing temperature, right? What is the maximum temperature for bearings? Is 40 degrees high?
Not only the bearings, but also the export changeover lines, pump cylinders, tanks, and temperatures are all high
The inlet of a liquid ring pump should be under negative pressure; how is yours at positive pressure? It seems that operating the liquid ring pump at a low flow rate at the inlet isn’t a problem; but is your load high or low? Try adjusting the bypass valve opening again. Additionally, the issue of dirty water must be resolved; if that’s not possible, the amount of water replaced by the liquid ring pump can be increased. The water temperature also must be lowered to enhance the cooling effect.
I haven’t seen those from other factories; at our location, the pressure at the entrance is positive, and since it’s located behind the water seal tank, the pressure there must also be slightly positive. And I’ve tried turning the secondary line on and off as well. The water cooler is designed to be small, with an outer diameter of around 300. The temperature is also this high in winter. Also, what does the water displacement amount mean? Newbie, please explain. Thank you.
Replacement involves draining the dirty water from the vane pump at the low point, and then opening the make-up water valve to add fresh water.
Fresh water is injected every time the pump is started.
I’m speechless – 25 kPa or 13 kPa, and still questions about positive or negative pressure? Hehe……