Seeking expert advice on compressor repair issues! ! ! ! !
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To get straight to the point, the process compressor originally did not have its second stage in operation; after maintenance, it is now the second stage that is causing overpressure. All of the exhaust and intake valves for stages one, two, and three were replaced, as well as the piston rings. What other reasons could cause this phenomenon? The image shows level 2
The cause of overpressure at stage 2 (the same is true for other stages) is generally not due to stage 2 operating under excessive conditions (unless the intake pressure increases), but rather due to leakage from stage 3 into stage 2.
What does it mean when the first level of failure causes the second level to stop working? Is the secondary pressure discharge low? As mentioned on the 4th floor, high secondary pressure is usually caused by problems with the tertiary gas valve. If there are bypasses, such as 3-to-2 or 3-to-1 bypass valves, it is necessary to consider checking them. What exactly is the high work pressure at the second level like now? Is the secondary inlet higher or the secondary outlet higher? Where is the primary entrance? What about the temperatures at various levels?
Check whether the interstage heat exchanger is functioning properly.
The poster needs to provide more information, such as the process flow of the process gas and the parameters that changed before and after maintenance. Simply speaking, secondary overpressure refers to an increase in the pressure of the secondary exhaust; the inlet pressure at the primary stage and the secondary stage remains normal, while the exhaust pressure at the secondary stage increases. It is most likely a leak in the third-stage intake and exhaust valves (the capacity of the third stage decreases, and pressure builds up in the second-stage exhaust system). Check the top dead center clearance of the second and third cylinders again. If there is step-by-step backflow, it is also necessary to check the backflow valves for each stage. 2. If both the secondary inlet and outlet have changed, more information is needed to conduct an analysis.
I have replaced all the air valves with new ones; now the temperature of the cooling water at the next stage is normal. There was too much scaling
It’s good as long as it’s back to normal. . . It is quite rare, however, for a cooler to have poor cooling performance and thus cause a significant pressure overload. Poor cooling performance will cause the pressure in front of the cooler to increase slightly, but it shouldn’t be very noticeable.
The overpressure is unrelated to the cooling system, and the cause has not been identified