Question

How can the number of an absorption column be determined in chemcad ?

Answer 1

For this we need to prepare a dynamic models of SCDS, TPLS and TOWR using following steps.

If a plot for one of the stages in the column is desired, specify the following:

Stage No. – Enter the stage number for which the properties will be plotted.

Phase – Indicate whether you are plotting data for the liquid or vapor phase.

Time Unit / Frequency Time Unit Specify what time unit you want to use for the x-axis and the frequency you want plotted (hr, min, sec).

Plot Frequency This is the number of time steps between plotting results. If the simulation integration time step is one minute and the plot frequency is five, the results will be plotted every five (simulated) minutes.

Y-axis min/max values CC-DCOLUMN allows tuning up the range for the plot of a recorded variable. Specify a minimum and maximum for the y-axis of your plot Components to be plotted

You may plot up to ten components by selecting them in this section.. If the plot you select is any related to flow or concentration (i.e. mole/mass/mass frac/ etc) you may want to select the component(s) to be plotted.

Select components from the pull-down list.

The dynamic models of SCDS, TPLS and TOWR are extensions of their steady state models. Therefore it is assumed the user is already familiar with the specification, topology, convergence of these models common to CC-STEADY STATE. In this section we will discuss the dynamic features and specifications of the SDCS, TPLS and TOWR models. The SCDS distillation UnitOp can also perform dynamic calculations with the mass transfer models.