Calculating Steam (Water) Pick-Up

[purplehaze2004]

Needed to calculate the water pick-up in slurry that is
heated using direct steam injection (so I can reduce the
amount of water in the slurry appropriately to accomodate
the additional water being injected in the steam).
Steam (SAT) = 120psi
batch.
T1=140F slurry
TF=190F slurry
470LBS product (assume WATER for calculations because of
high water content

Can somebody help me out and double check my calculation
of 50LBS pickup.

 

[25362]

From a quick enthalpy and mass balance I get 22 lb pick-up.

 

[purplehaze2004]

25362

can you show your calculations?

 

[25362]

Considering just water, a mass-and-enthalpy balance with data from tables, shows:
Enthalpy, Btu/lb

Original water, W, at 140 F: 108
Saturated picked up steam, S, at 120 psia: 1191
Final mix, W+S = 470 lb, at 190 F: 158

W = 470 (1191-158)/(1191-108) = 448 lb​

Thus S = 22 lb.

 

[purplehaze2004]

shoot.
i messed up with one of my figures from the steam table.

thanks 25362.

i had a feeling something was off.