The four-stage compression ratio of the compressor has abnormally decreased.
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My unit is a five-stage compression centrifugal compressor, and I am facing problems with production now. The phenomenon is high pressure in stage 1 of the compressor, reduced outlet pressure in stage 3, significantly decreased flow rates at the outlets of stages 3 and 5; moreover, compressors 3-1 and 5-4 are constantly operating on the verge of surge. Additionally, due to changes in process conditions, the molecular weight of the compressor process gas decreases. Inspections revealed that the compression ratio in the third stage had decreased significantly, from 2.5 to 2.1, and the pressure difference from the outlet of the second stage to the inlet of the third stage had dropped. The compression ratios of the other sections are normal, and the pressure differences between sections are normal. Dear sea friends, in this case there is under-compression in three segments – is that the cause of this situation? How is three-stage undercompression formed? Are there any other reasons besides the lower molecular weight of the process gas?
The title is incorrect; it’s the three-stage compression ratio that has decreased significantly
Has there been any change in the amount of intake air? By how much do your composition changes the specific parameters? What is the grade and stage of the compressor? How many air inlets are there? It would be best if there are pictures
My unit features five stages of compression; only the compression ratio at the three outlet stages is significantly reduced, while all other stages are normal.
The molecular weight decreased from 26 under normal conditions to around 23. Furthermore, as the rotational speed increased, the steam volume did not increase. It is initially suspected that there may be inter-stage air leakage or blockage in the three sections.
The insufficient exhaust volume in the second stage should be considered
Is there a significant increase in the condensate?
There is no increase in condensate, and the compressor flow rate has decreased significantly.