So, the operating P (and Temperature) of deaerator increases beyond 0.2 kg/cm2 (and 105 C) when the flow rate of water at 62.23 kg/cm2 increases from 7~8 M.Ton/hr. Water at 4.5 kg/cm2 and water at 62.23 kg/cm2 both are entering in to the deaerator (vessel). The mixing point here is inside a vessel (deaerator) operating at 0.2 kg/cm2. It is true that a stream at lower P cannot enter a mixer operating at higher P.īut please consider a real problem we are facing at our plant.
Tee vs mixer aspen hysys plus#
I have attached the respective Aspen PLUS PFD for understanding of the so much. Please help me in realistically model the mixing process. Is there any mean in Aspen PLUS/HYSYS by which we can get the actual P at the mixer outlet? Also flashing/vaporization occurs after the mixing of the streams in reality, but in Aspen PLUS/HYSYS no vaporization takes place at the mixer outlet. But we don't get the actual P (which is greater than 10 kg/cm2) instead we get the outlet P=4.5 kg/cm2 (which is the lowest P of the inlet streams). In real scenario at our plant, the mass flowrate of water at 62.23 kg/cm2 is 10 M.Ton/hr and the mass flow rate of water at 4.5 kg/cm2 is 50 M.Ton/hr.īy putting actual mass flow rates although we get nearly actual temperature that is achieved after mixing of the 2 streams. My question is how can we or model the actual realistic resultant P after mixing 2 streams at different Pressures in Aspen PLUS/HYSYS?Īlso no flashing occurs after the mixing (but in actual process the water at 62.23 kg/cm2 is flashed (vaporized) when it mixes with low pressure water at 4.5 kg/cm2. then the P of the outlet is selected to be equal to the lowest inlet P (which in our case is 4.5 kg/cm2G) In HYSYS we have only 2 options in a mixer,ġ.) either to equalize the inlet Pressures (which makes the outlet P=inlet P)Ģ.) or to make the outlet P=lowest inlet Pġ.) either we can give any value for the outlet P of the mixer in mixer specifications.Ģ.) or we can put 0 kg/cm2 (which is the default value for any stream mixer). After I installed a mixer for these two streams in Aspen PLUS/HYSYS, then the P and T of the outlet stream calculated by Aspen PLUS/HYSYS is 4.5 kg/cm2G & 82.76 C.Īs we can see although the outlet T is the actual resultant T (achieved by Energy Balance) but the outlet P is not the actual resultant P (the outlet P is instead the lowest inlet P). Suppose we have two streams consisting of water.
Tee vs mixer aspen hysys how to#
How to realistically model the mixing of two different streams (lets say water) of equal mass flowrate at different temperature and pressures in Aspen PLUS and Aspen HYSYS?
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