Centrifugal and Axial Compressor Control
Control engineers, mechanical engineers and mechanical technicians will learn how to select the proper control systems for axial and centrifugal compressors for proper throughput and surge control, with a particular emphasis on surge control. Readers will learn to understand the importance of transmitter speed, digital controller sample time, and control valve stroking time in helping to prevent surge. Engineers and technicians will find this book to be a highly valuable guide on compressor control schemes and the importance of mitigating costly and sometimes catastrophic surge problems. It can be used as a self-tutorial guide or in the classroom with the book's helpful end-of-chapter questions and exercises and sections for keeping notes.
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SECTION 9 Throughput and Surge Control Interaction
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acfm actuator amplitude axial compressor booster centrifugal compressor compressor characteristic curve compressor curve compressor map control loop controller gain controller set point dead band decrease discharge pressure discharge throttling disturbance downstream dynamic compressors efficiency feedback surge controller flow controller flow measurement flowmeter frequency impeller increases inlet installed interaction Key Concepts linear linear span load curve loop period molecular weight open the surge open-loop backup operating conditions operating point percent piping plot pneumatic pressure control pressure rise proximitor probe ratio station reactor real time analyzer Reciprocating compressors recycle remote set point reset shaft shift shows shutdown slope specific heat ratio speed control stall static instability stroking suction flow suction pressure suction temperature suction throttling surge control system surge control valves surge curve surge cycle surge oscillations surge set point surge valves tachometer thermowell throttle valve throughput control transmitter versus h vibration voltage volumetric flow zero