Volume Control at Variable Speed

A turbine-driven screw compressor might be applied to a catalyst regeneration process. The nature of the process then will require constant volume control to maintain a required output temperature in the regenerator. The arrangement is shown in Figure 8-40(b) and would occur as follows:

1. The flow transmitter (transducer block) senses the flow element differential pressure, converts this signal to a signal proportional to the process flow, and sends it to the flow controller.

2. The flow controller (controller block) amplifies the transmitter signal and sends a modified signal to the final element. The three-mode controller will probably be used.

3. The final element is speed control, which is accomplished by a mechanism that varies the turbine-governor speed setting.

An increase in flow over set point would cause a signal to reach the governor and reduce the speed to maintain the desired system flow.

Figure 8-40, Control arrangements for compressors. (Modified from [5J)
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