I attended your seminar in Sasol, Secunda in 2008. Our problem is that when
we open our compressor spill-back, which we thought would stop surge, it
sometimes makes the compressor surge. What is our problem?
--H.K.
Masa
Your problem is that the
spill-back flow is hot. This reduces vapor density. Which reduces compressor
delta P. Which reduces compressor discharge pressure. Which allows gas flow to
stop and reverse. I had this exact problem in 1974 on my alky unit in Texas
City. I desuperheated compressor suction by injecting a spray of liquid
isobutane into the suction. This would quickly bring the compressor out of
surge. Hope this helps.
--Norm
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