Split issue in drum dryer (Drying)

[Uzair1shah]

Hello,

I am working on modeling a biorefinery using BioSTEAM, and I used Drum Dryer from the available units repository ('drying'). When I simulate drum dyer, it splits the whole feedstock instead of just splitting the moisture/water from the feedstock, which consists of 9 different components. I have tried using component-wise split, but gives me error. The part of the code for drum dryer is as follows:

# Rotary Dryer
S107 = Stream('S107', phase='g') #Air
S108 = Stream('S108', phase='g') #Natural gas
S109 = Stream('S109', phase='s') #dry feedstock/solids
S110 = Stream('S110', phase='g') #hot air
S111 = Stream('S111', phase='g') #emissions
UO105 = units.DrumDryer('UO105', ins=(S105,S107,S108), outs=(S109,S110,S111), split = 0.5 )

# Simulation of UO105 (Rotary dryer)
UO105.simulate()
UO105.show(flow='kg/hr')
r5 = UO105.results()
UO105.diagram()
print(r5)

The input and output streams are as follows:
ins:

outs:

So, instead of adding moisture, in a separate stream, S110, it adds up moisture in the feedstock while splitting all the components of feedstock. I am not sure if it is a bug or I am doing something wrong. I would really appreciate if you can help me in this regard. Thanks a lot.

[yoelcortes]

@Uzair1shah,

Components defined in split go to the gas. Use the moisture_content parameter to adjust the moisture content of your dried solids. I just added a full example in the documentation:

https://biosteam.readthedocs.io/en/latest/API/units/drying.html

Quick tip: You can use the python help function to view documentation in your console (e.g. help(biosteam.DrumDryer)). If you are using Spyder, you can also highlight the object and ctrl+I will show you the documentation in a pane.

I hope this helps!
Thanks.