Greetings,
Apologize in advance as my question may seem very basic, still I would like to have a clearer picture of what I am dealing with for an ongoing project.
The set up includes one centrifugal compressor of barrel type which is recirculating a mixture of process gas in a closed loop.
The loop is actually a big process loop which comprises pipes, components, process coolers, drums, vessels, etc.
Upstream of the compressor there is a process gas cooler so that the inlet temperature to compressor is always constant =35 degC.
At the initial phase of recirculation operation, the gas is 99% Air + some Argon content and the temperature of the loop is around ambiant 35 deg C. Next phase of operation, the gas in the loops is heated up to 150 deg C maximum.
Last phase of operation, the gas in the loop stays heated up at 150 deg C whereby a small amount of helium is added in the loop so the gas molecular weight drops.
During all these phases our process engineer says that standard volume flow (std m3/h) circulated in the loop needs to stay constant. (I hope Process is not confusing with keeping actual m3/hour constant to have gas velocity kept constant somewhere in critical equipment area - but that is another story)
What I am trying to figure out is the impact on the total pressure dropping in the loop corresponding to each phase.
I think that if the initial phase has a certain pressure drop, say Dp, when the temperature increases in the loop, the pressure dropping increases further in this case significantly (say by Dp2) so total dropping becomes (Dp + Dp1). At final phase, the molecular weight decreases a bit (by 1 or 2 points) thereby the pressure dropping decreases so we are slightly below (Dp + Dp1). Again this is keeping the standard volume flow constant throuout the loop in all three cases.
Is the reasoning correct ? Is there a rule of thumb or a book reference to use so I can confirm all this ?
Process has to do all the math here and evaluate pressure losses for each case. This is however not available at the moment.
thanks
"If you want to acquire a knowledge or skill, read a book and practice the skill".
Apologize in advance as my question may seem very basic, still I would like to have a clearer picture of what I am dealing with for an ongoing project.
The set up includes one centrifugal compressor of barrel type which is recirculating a mixture of process gas in a closed loop.
The loop is actually a big process loop which comprises pipes, components, process coolers, drums, vessels, etc.
Upstream of the compressor there is a process gas cooler so that the inlet temperature to compressor is always constant =35 degC.
At the initial phase of recirculation operation, the gas is 99% Air + some Argon content and the temperature of the loop is around ambiant 35 deg C. Next phase of operation, the gas in the loops is heated up to 150 deg C maximum.
Last phase of operation, the gas in the loop stays heated up at 150 deg C whereby a small amount of helium is added in the loop so the gas molecular weight drops.
During all these phases our process engineer says that standard volume flow (std m3/h) circulated in the loop needs to stay constant. (I hope Process is not confusing with keeping actual m3/hour constant to have gas velocity kept constant somewhere in critical equipment area - but that is another story)
What I am trying to figure out is the impact on the total pressure dropping in the loop corresponding to each phase.
I think that if the initial phase has a certain pressure drop, say Dp, when the temperature increases in the loop, the pressure dropping increases further in this case significantly (say by Dp2) so total dropping becomes (Dp + Dp1). At final phase, the molecular weight decreases a bit (by 1 or 2 points) thereby the pressure dropping decreases so we are slightly below (Dp + Dp1). Again this is keeping the standard volume flow constant throuout the loop in all three cases.
Is the reasoning correct ? Is there a rule of thumb or a book reference to use so I can confirm all this ?
Process has to do all the math here and evaluate pressure losses for each case. This is however not available at the moment.
thanks
"If you want to acquire a knowledge or skill, read a book and practice the skill".
