Adding a New Controller

You will now add a fourth controller, the MCHCOMP PID

controller. This controller will maintain the purity of MCH in the

liquid distillate product by manipulating the phenol solvent feed

flow rate of stream 2.

To add the controller block:

1. In the All Items pane of the Simulation Explorer, click the

expand (+) button next to Dynamics (the Dynamics library).

An expanded view of the Dynamics library is displayed.

2-8 • Tutorial 2 - Modifying the Control Scheme Getting Started Guide

2. Click the Expand (+) button next to the ControlModels icon.

3. From the ControlModels list, click the PID object to select it.

4. Drag PID onto the Process Flowsheet window and drop it in a

suitable position above stream 2.

5. Click this newly-positioned block to select it.

6. Click with the right mouse button on the block and from the

menu that appears, click Rename Block.

7. In the Input dialog box, type the new controller name

MCHCOMP, then click OK.

Getting Started Guide Tutorial 2 - Modifying the Control Scheme • 2-9

In this section, you will modify the control scheme to simulate a 5-

minute sensor dead time. This represents a delay in the

composition analysis.

To add the dead time block:

1. In the All Items pane of the Simulation Explorer, ensure that

the Dynamics library is in expanded view and the

ControlModels list is displayed.

2. Click Dead_time and drag it to the Process Flowsheet

window. Drop it to the left of the MCHCOMP PID block.

3. Click the newly-positioned block to select it.

4. Click with the right mouse button on the block and from the

menu that appears, click Rename Block.

5. In the dialog box that appears, type the name MCHCOMPDT

for the Dead_time block and click OK.

Your flowsheet looks like this:

Дата добавления: 2015-08-20