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Corn-ethanol biorefinery / distillers'-grains dryer, Blair, Nebraska, USA

How to simulate superheated-steam drying loop with mvr heat recovery

A wet cake is dried in a superheated-steam dryer (steam as the drying medium instead of hot air), and the evaporated moisture — pure steam — is recovered by mechanical vapor recompression (MVR) plus a trim superheater into high-grade superheated steam that reheats the recirculating drying medium. Superheated-steam drying is the energy-efficient route for biofuel and food solids (distillers' grains, beet pulp, lignite): because the drying atmosphere is steam, the evaporated water leaves as *more steam* whose latent heat is recompressed and reused, instead of being lost in a humid exhaust. Honesty note (same posture as bioethanol-mvr-stillage): the dryer is FlowSim's screening solid-in / vapor-out convective model (computes its own latent+sensible duty; the dried-solid identity is a generic surrogate, here 'ethanol' crystals as in the solids train), and the steam recirculation is modeled OPEN — the recompressed+superheated steam is reported as the recovered drying medium rather than piped back into the bed as a closed material recycle (the dryer op has no steam inlet to close the loop into). The MVR recompression + trim superheat of the evaporated steam — the defining SSD efficiency win — is modeled with the real compressor and heater ops.

Solids
Water
solid
liquor
cake
filt
Dewater
wet
dry
vap
SSD
MVR
Superheat
Drysolid
Filtrate
Recirc Steam
  1. 1
    Open the ready-made model

    Open the "Superheated-steam drying loop with MVR heat recovery" model in the MaximaLabs workspace — no install, no license. It loads live on the canvas, ready to edit and run.

  2. 2
    Confirm the thermodynamics

    This process is modeled with the NRTL property package over ethanol, water — already selected, so the phase equilibrium and enthalpy are physically consistent from the first run.

  3. 3
    Review the flowsheet

    The flowsheet chains Dewater, SSD, MVR, Superheat. Every block is a real, solvable unit op you can reconfigure on the canvas.

  4. 4
    Run the simulation

    Click Run. The deterministic solver converges the material and energy balances (recycles included) and fills the live stream table — the AI never invents a number.

  5. 5
    Read the results and iterate

    Inspect the converged streams, tweak a spec, and re-run — or ask the AI copilot to explain a result or diagnose a failed solve in plain English.

What you'll build
Thermodynamics
NRTL
Components
ethanol, water
Unit operations
DewaterSSDMVRSuperheat
Open this model in the workspace

Opens live on the canvas — free, no install.

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