Consulting on ProcessWaterCenter (PWC)

[zasddsgg]

Hello, may I ask you some questions about ProcessWaterCenter (PWC)? Thanks for your help. Wish you a good day.

a) Hello, may I ask you how to use PWC? I have checked the relevant tutorial, there are 4 import streams in the tutorial (https://biosteam.readthedocs.io/en/latest/API/facilities/ProcessWaterCenter.html#:~:text=ins%20(AbstractStream,up%20process%20water), but why only 3 import streams when using PWC (https://biosteam.readthedocs.io/en/latest/tutorial/Building_a_biorefinery.html#Unit-operations-and-simulation:~:text=ins%3D(bst.Stream()%2C%20makeup_water%2C%20P303%2D0)%2C)? Do makeup_water_streams and process_water_streams have to be set (https://biosteam.readthedocs.io/en/latest/tutorial/Building_a_biorefinery.html#Unit-operations-and-simulation:~:text=makeup_water_streams%3D(,.boiler_makeup_water)))? If so, how should it be set, that is to say, what streams should be included in makeup_water_streams and process_water_streams?

b) When calling PWC, do I need to set anything else besides ins, outs, makeup_water_streams, process_water_streams? Can I not set outs, makeup_water_streams, process_water_streams, that is, can I just set ins?

c) May I ask you how to set up ins, is there a requirement for the order and number of streams in ins? For example, does ins have to have four streams?

d) I tried the following two different codes using PWC in my own process (S604 is S604 in the cellulosic model, exit stream is RO treated water, P403 is P403 in the cellulosic model, the exit stream is recycle process water), but the calculated amount of process water required by PWC is not the same, may I ask you why? The two codes are as follows. The first code:

bst.facilities.ProcessWaterCenter('PWC',
        (S604-0, 'makeup_RO_water', P403-0, 'makeup_process_water'))

The second code:

bst.facilities.ProcessWaterCenter('PWC',
        (P403-0, S604-0))

e) Like the inlet stream cellulase stream of M301(enzyme hydrolysate mixer) in cellulosic model, which also has water, will the process water required for the process take this part into account? Or does BioSTEAM consider only the flow rate of an inlet stream whose components contain only water?

f) Why does the process_water_streams in the tutorial include s.cooling_tower_makeup_water, s.boiler_ makeup _water (https://biosteam.readthedocs.io/en/latest/tutorial/Building_a_biorefinery.html#:~:text=s.cooling_tower_makeup_water%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20s.boiler_makeup_water))), shouldn't they be makeup_water_streams? According to the tutorial, process_water_streams refers to the all inlet process water streams (excluding makeup water streams) (https://biosteam.readthedocs.io/en/latest/API/facilities/ProcessWaterCenter.html#:~:text=process_water_streams%20(List%5BStream%5D%2C%20optional)%20%E2%80%93%20All%20inlet%20process%20water%20streams%20(excluding%20makeup%20water%20streams)).

g) For makeup_water_streams=(BT-1, CT-1) (https://github.com/BioSTEAMDevelopmentGroup/Bioindustrial-Park/blob/master/biorefineries/cellulosic/systems/cellulosic_ethanol.py#L56), BT-1, CT-1 refers to blowdown water, not makeup water, why does makeup_water_streams include BT-1, CT-1? For process_water_streams=process_water_streams, why does process_water_streams include BT-1, CT-1 (https://github.com/BioSTEAMDevelopmentGroup/Bioindustrial-Park/blob/master/biorefineries/cellulosic/systems/cellulosic_ethanol.py#L57, https://github.com/BioSTEAMDevelopmentGroup/Bioindustrial-Park/blob/master/biorefineries/cellulosic/systems/cellulosic_ethanol.py#L47)? It should be process_water_streams refer to all inlet process water streams (excluding makeup water streams) (https://biosteam.readthedocs.io/en/latest/API/facilities/ProcessWaterCenter.html#:~:text=process_water_streams%20(List%5BStream%5D%2C%20optional)%20%E2%80%93%20All%20inlet%20process%20water%20streams%20(excluding%20makeup%20water%20streams))