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DanWBR / dwsim

DWSIM is a Steady-State and Dynamic Sequential Modular Chemical Process Simulator for Windows, Linux and macOS.
https://dwsim.org
GNU General Public License v3.0
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[Bug] Solid separator not working #173

Closed Greg66 closed 3 years ago

Greg66 commented 3 years ago

Describe the bug The solid separator is not working correct.

To Reproduce Steps to reproduce the behavior:

  1. Create a stream with pure water, consisting of ice and liquid water at 0°C
  2. feed that stream into a solid separator unit operation
  3. Both output streams are at boiling point now with a vapor fraction of 93%

Expected behavior

  1. Liquid output stream 1 should be only water at 0°C
  2. Solid output stream 2 should consist of solid only at 0°C

Sample file See following file for demonstration: Ice production.zip

Screenshots image

Desktop (please complete the following information): -DWSIM 6.6

Additional context My analysis with the debuger showed, that material streams of pure components are enforced to be calculated by PH-flash instead of the flash type defined from connected unit operation. Here a TP-Falsh is definied from solid separator for both output streams (which is supposed to be correct here). As enthalpy of output streams is not defined from solid separator side, the result of PH flash can't be correct. In my view this enforced PH flash should be discarded.

DanWBR commented 3 years ago

@Greg66 in your sample case, even with the fix, the liquid phase will have some solid due to T/P conditions and the presence of water.

Greg66 commented 3 years ago

Hi Daniel i just issued a new commit solving the issue you mentioned. By defining the stream enthalpy of outlet streams and the stream spec to be PH instead of TP this unit is working as expected now. Separator efficiencies of solid and liquid phases are working now as well. Commit: #177

DanWBR commented 3 years ago

@Greg66 great, thanks! closing this issue then.