Steady state simulation does not work in column sample

[thifleck]

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

[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.

[Rafael de Pelegrini Soares]

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.

[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