An introduction to two phase separation and the implications on control loop interaction. Using a simple two phase separator this model demonstrates the basic principles of separation by allowing the pressure, flow and temperature of a vessel to be changed allowing varying degrees of separation. The model includes a flow controller on the vessel feed, level control in the flash vessel and vessel pressure control. The effect of both the flash compositions and each of these control loops is explained in a series of assignments contained within the model.
The model may be used for whole class teaching at a basic level, or for trainees individually by using measurement of Ultimate Gain and Period to calculate the tuning constants using the Zeigler Nichols formulae.
The model may also be used to show many other aspects, including the effect of pressure and liquid head on flow, and the limiting of the available Set Point range by each valve Cv or Cg at different conditions.
The model includes User Guide, Assignments, Trend Charts and Fluid Composition breakdown for the input, liquid and gas streams
The graphic above is a screen shot with the 'Trend Chart' tab selected and with one of the Controller faceplates shown in the top right hand window.
