Volume Control at Constant Speed

A motor-driven compressor is used as an oxidation system for a chemical unit. The control scheme for this arrangement is shown in Figure 8-40(e). Description of the control blocks follows.

1. The flow transmitter senses the process flow, converts this to a signal that is proportional, and sends this signal to the flow controller.

2. The flow controller amplifies the transmitter signal and sends a modified signal to the final element.

3. The final element is the compressor guide-vane mechanism. The guide vanes are adjusted by means of a positioning cylinder. This cylinder is operated by a servo valve that receives a signal from the flow controller.

Here, an increase in flow above the set point causes a signal to reach the final element, which will result in the closing of the guide vanes to decrease flow.

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