Opened 13 years ago

Closed 12 years ago

#126 closed defect (fixed)

Steady state simulation does not work in column sample

Reported by: thifleck Owned by: Paula Bettio Staudt
Priority: minor Milestone: Separation Columns
Component: EML Version: 0.9.59
Keywords: Cc:

Description

The FlowSheet? Packed_kettle_cond_Test from the sample_column.mso file does not work when the Dynamic option is set to false.

Change History (4)

comment:1 in reply to:  description Changed 13 years ago by thifleck

Replying to thifleck:

The FlowSheet? Packed_kettle_cond_Test from the sample_column.mso file does not work when the Dynamic option is set to false.

The FlowSheet? Distillation_kettle_cond_Test has the same problem.

comment:2 Changed 13 years ago by Rafael de Pelegrini Soares

Priority: majorminor

Hi,

This is a know problem. The same can happen even on a very simple dynamic flash model.

A dynamic column model needs some controllers to properly operate. I guess the source of the problem are the controllers which have no solution with the current models. If you try to solve a model of a column section alone (with not control) it will work.

Regards.

comment:3 Changed 12 years ago by Argimiro Resende Secchi

Hi,

Actually when a dynamic model of a distillation column are set without the inventory controllers, then the steady-state simulation will not work, due to structural singularity. So, in order to solve the steady state of the packed distillation column, first it is necessary to add these controllers. There is an example, PackedColumn_ctrl, in the sample_column.mso file that is ready to make this test. Just use the initial file as initial guess file and solve the steady state.

Regards, -Arge

comment:4 Changed 12 years ago by Argimiro Resende Secchi

Resolution: fixed
Status: newclosed
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