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We have a centrifugal compressor in MEG plant which is recycling gas flow thru the system. Makeup is added at suction & product is removed from the loop.
Compressor is a constant speed machine. Which is giving higher pressure at discharge say 18 Kg abs. We dont need 18 Kg in the system so there is a pressure killing device which is reducing it to 17 Kg abs. Further system drop is 3 Kg. So at compressor suction it is 14 Kg.
Now somebody proposed to install IGV i.e. instead of dischrge throttle it should be suction throttle.
I am not able to understand how this is going to reduce the power consumtion in the compressor.
Because,
1. Will the preesure ratio change in this case, I suppose so bcoz suction pressure is different now.
2. If it changes, it will increase or decrease. My opinion - it will increase mathematically.
3. IGV control will reduce flow or not, bcoz we dont want to reduce flow. (My plant capacity will go down.)
4. How to calculate suction pressure and power consumption in this case.
Thanx
Pawan
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Centrifugal Compressor
Started by Guest_Guest_Pawan_*_*, May 02 2006 11:47 PM
1 reply to this topic
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