Surge control in compressors pdf

Anti surge control of centrifugal compressor at pt. Compressor loadsharing control and surge detection. A centrifugal compressor driven by an electrical motor is studied, and the drive itself is used for surge control, thus elliminating the need for additional actuators. Compressor loadsharing control and surge detection techniques. Drive torque actuation in active surge control of centrifugal compressors. Many facilities employ two or more centrifugal compressors, operated in either series or parallel configurations. Full explanation of surge occurrence in compressor. The set point of the pi controller is a flow rate that lies on the control line. Normally, a polynomial equation is used to approach the control line. Pdf surge control and dynamic behavior for centrifugal gas.

Understanding centrifugal compressor surge and control. Centrifugal compressor surge and speed control article pdf available in ieee transactions on control systems technology 75. Typically the pi proportional integral control algorithm will active and start to modulate the anti surge control valve if the compressor operates between the control line and the surge line. Compressor loadsharing control and surge detection techniques wayne jacobson. The instability is characterized by large limit cycle oscillations in compressor. Centrifugal and axial compressors are susceptible to surge which can cause catastrophic damage to your turbomachinery train. The antisurge controller is one of the most critical turbomachinery control applications that protect a compressor from surge by continuously calculating the distance between the compressor s operating point and its surge limit line. Surge in centrifugal and axial compressors often manifests itself as oscillations of flow and pressure, as well as related compressor parameters, such as rotating. Finally, the developed surge control system was implemented with real data of solar compressor in sirt oil co. Antisurge control ccc compressor controls corporation. Mcmillan, emerson automation solutions, chesterfield missouri. Understanding centrifugal compressor surge and control published on. Meaning of surge in a centrifugal compressor ask a chemical or mechanical engineer, what does a compressor surge do, and he would shudder merely thinking of the consequences. Surge control considerations in centrifugal compressors.

Pdf anti surge control of centrifugal compressor at pt. Figure 2 uses first closed loop pid module to control the operating point of the compressor below pressure ratio. Compressor surge prevention control implemented on yokogawa. A new approach to designing centrifugal compressor surge. What is surging in reciprocating compressor answers. An emphasis is placed on the physical understanding of surge phenomena and on the practical limitations of surge control systems. Anti surge controller working principle instrumentation. The required control response is a function of the response time of the surge valve, measurement devices and control algorithm relative to the surge dynamics of the compressor. In order to develop compressor network control strategies, it is necessary first to express compressor performance in an invariant. This tutorial discusses the design and function of surge control systems, or more precisely, surge avoidance systems on the basis of the behavior of centrifugal compressors when they interact with. In this article, we will see the centrifugal compressor surge basics, mechanism and also we will see how the surge takes place in centrifugal compressor with an example. Anti surge control system for centrifugal compressors part.

Pdf drive torque actuation in active surge control of. Centrifugal compressor surge, modeling and identification. Section 3 description of surge 31 surge versus stall surge is a dynamic instability that occurs in dynamic compressors. Pdf surge control and dynamic behavior for centrifugal. The surge cycle will repeat itself unless control systems are installed or operational changes are made to bring the compressor out of the surge cycle. Active surge control of centrifugal compressors using. In an earlier surge control post, s greg mcmillan noted that surge valves typically have response times from 1 to 5 seconds. Considerations for advanced centrifugal compressor control. This paper addresses the area of compressor stability, surge and surge control and relates to the practical aspects involved. Surge is a characteristic behaviour of a centrifugal compressor that can occur when inlet flow is reduced such that the head developed by the compressor is insufficient to.