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Research Papers: Gas Turbines: Oil and Gas Applications

Centrifugal Compressors During Fast Transients

[+] Author and Article Information
Matthew Blieske

Mechanical Engineering Division, Southwest Research Institute® , P.O. Drawer 28510, San Antonio, TX 78228-0510matthew.blieske@swri.org

Rainer Kurz

 Solar Turbines Incorporated, 9330 Sky Park Court, San Diego, CA 92123kurz_rainer_x@solarturbines.com

Augusto Garcia-Hernandez

Mechanical Engineering Division, Southwest Research Institute® , P.O. Drawer 28510, San Antonio, TX 78228-0510augusto.garciahernandez@swri.org

Klaus Brun

Mechanical Engineering Division, Southwest Research Institute® , P.O. Drawer 28510, San Antonio, TX 78228-0510kbrun@swri.org

J. Eng. Gas Turbines Power 133(7), 072401 (Mar 24, 2011) (8 pages) doi:10.1115/1.4002681 History: Received May 20, 2010; Revised May 22, 2010; Published March 24, 2011; Online March 24, 2011

Transient studies for compressor systems allow the prediction of the compressor system behavior during fast transients such as they occur during emergency shutdowns. For the system simulations, the compressor behavior is assumed to be quasi-steady-state. This means in particular that the steady-state compressor flow-head-efficiency-speed map remains valid. During well instrumented emergency shutdown tests conducted on a centrifugal compressor system under realistic operating conditions, data showing the head-flow-speed relationship of the rapidly decelerating compressor were taken. These data are compared with steady-state head-flow relationships taken at a number of speeds. This allows the determination of the relative deviation between the transient and steady-state head-flow-relationships and thus answers the question of the validity of steady-state assumptions during rapid transients. The impact of the fast transients on efficiency and consumed power, which can be derived from the speed decay of the system, as well as the impact of nonstationary heat transfer are also evaluated and reported.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Steady-state compressor map (test and prediction)

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Figure 2

Suction and discharge temperature variation through ESD with recycle valve position indicated

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Figure 3

Speed decay and rate change of speed decay after shutdown showing influence of residual driver power

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Figure 4

Measured versus calculated speed decay used to estimate mechanical losses

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Figure 5

Extrapolation of measured shaft power into the region where residual driver power was not zero, allowing calculation of residual driver power

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Figure 6

Predicted and measured flow versus head during ESD

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Figure 7

Relative error in head between map prediction and measured data during shutdown

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Figure 8

Illustration of no relationship between rate of deceleration and error between map predicted and measured power

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Figure 9

Comparison of map predicted power and measured power. Correction for heat transfer during shutdown is included.

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Figure 10

Thermal and mechanical losses expressed in power and relative to the shaft power delivered

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