mixing#

class Mixer(ID='', ins=None, outs=(), thermo=None, **kwargs)[source]#

Create a mixer that mixes any number of streams together.

Parameters:

  • ins (Sequence[Stream | str], optional) – Inlet fluids to be mixed.

  • outs (Sequence[Stream | str], optional) – Mixed outlet fluid.

  • rigorous – Whether to perform vapor-liquid equilibrium.

Notes

When streams at different pressures are mixed, BioSTEAM assumes valves reduce the pressure of the streams being mixed to prevent backflow (pressure needs to decrease in the direction of flow according to Bernoulli’s principle). The outlet pressure will be the minimum pressure of all inlet streams.

Examples

Mix two streams:

>>> from biosteam import units, settings, Stream
>>> settings.set_thermo(['Ethanol', 'Water'], cache=True)
>>> s1 = Stream('s1', Water=20, T=350)
>>> s2 = Stream('s2', Ethanol=30, T=300)
>>> M1 = units.Mixer('M1', ins=(s1, s2), outs='s3')
>>> M1.simulate()
>>> M1.show()
Mixer: M1
ins...
[0] s1
    phase: 'l', T: 350 K, P: 101325 Pa
    flow: 20 kmol/hr Water
[1] s2
    phase: 'l', T: 300 K, P: 101325 Pa
    flow: 30 kmol/hr Ethanol
outs...
[0] s3
    phase: 'l', T: 315.14 K, P: 101325 Pa
    flow (kmol/hr): Ethanol  30
                    Water    20
class SteamMixer(ID='', ins=None, outs=(), thermo=None, **kwargs)[source]#

Create a mixer that varies the flow of steam to achieve a specified outlet pressure and varies the flow of process water to achieve a specified solids loading (by wt).

Parameters:

  • ins (Sequence[Stream | str], optional) –

    • [0] Feed

    • [1] Steam

    • [2] Process water

  • outs (Sequence[Stream | str], optional) – Mixed product.

  • P (float) – Outlet pressure.

  • T (float) – Outlet temperature.

  • solids_loading (float, optional) – Final solids loading after mixing in process water.

  • soilds_loading_includes_steam (bool, optional) – Whether to include steam in solids loading calculation.

Examples

>>> import biosteam as bst
>>> bst.settings.set_thermo(['Water', 'Glucose'])
>>> feed = bst.Stream('feed', Water=10, Glucose=10)
>>> M1 = bst.SteamMixer(None, ins=[feed, 'steam', 'process_water'], outs='outlet', T=431.15, P=557287.5, solids_loading=0.3)
>>> M1.simulate()
>>> M1.show('cwt100') # Note that outlet solids loading is not exactly 0.3 because of the steam requirement.
SteamMixer
ins...
[0] feed
    phase: 'l', T: 298.15 K, P: 101325 Pa
    flow (%): Water    9.09
              Glucose  90.9
              -------  1.98e+03 kg/hr
[1] steam
    phase: 'g', T: 454.77 K, P: 1.041e+06 Pa
    flow: 1.29e+03 kg/hr Water
[2] process_water
    phase: 'l', T: 298.15 K, P: 101325 Pa
    flow: 4.02e+03 kg/hr Water
outs...
[0] outlet
    phase: 'l', T: 431.15 K, P: 557288 Pa
    flow (%): Water    75.3
              Glucose  24.7
              -------  7.29e+03 kg/hr

>>> M1.solids_loading_includes_steam = True
>>> M1.simulate()
>>> M1.show('cwt100') # Now the outlet solids content is exactly 0.3
SteamMixer
ins...
[0] feed
    phase: 'l', T: 298.15 K, P: 101325 Pa
    flow (%): Water    9.09
              Glucose  90.9
              -------  1.98e+03 kg/hr
[1] steam
    phase: 'g', T: 454.77 K, P: 1.041e+06 Pa
    flow: 1.02e+03 kg/hr Water
[2] process_water
    phase: 'l', T: 298.15 K, P: 101325 Pa
    flow: 3e+03 kg/hr Water
outs...
[0] outlet
    phase: 'l', T: 431.15 K, P: 557288 Pa
    flow (%): Water    70
              Glucose  30
              -------  6.01e+03 kg/hr
class MockMixer(ID='', ins=None, outs=(), thermo=None, **kwargs)[source]#

Create a MockMixer object that does nothing when simulated.

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