Research Papers: Gas Turbines: Oil and Gas Applications

Experimental Evaluation of the Transient Behavior of a Compressor Station During Emergency Shutdowns

[+] Author and Article Information
J. Jeffrey Moore, Augusto Garcia-Hernandez, Klaus Brun

 Southwest Research Institute, San Antonio, TX 78238

Rainer Kurz

 Solar Turbines Incorporated, San Diego, CA 92123

Some installations maintain fuel flow to the turbine for 1–2 s while the recycle valve opens. However, this can generate a safety hazard.

J. Eng. Gas Turbines Power 132(6), 062401 (Mar 16, 2010) (9 pages) doi:10.1115/1.4000093 History: Received March 19, 2009; Revised August 13, 2009; Published March 16, 2010; Online March 16, 2010

The transient behavior of compressor stations, particularly under rapidly changing conditions, is of vital interest to operators. Predicting transient behavior is an important factor in avoiding damage during events such as emergency shutdowns. A limited number of “accidental” data sets from compressor manufacturers and users are available in the public literature domain. A variety of simulations and modeling approaches have been presented over the last few years at industry conferences. The available experimental data is not of sufficient quality and resolution to properly compare predictions with analytical results or simulations available in current software packages. Necessary information about the compressor, driver, valves, and geometry of the system is often missing. Currently utilized software has not been adequately validated with full-scale realistic benchmark data, as this data is not available in the public domain. Modeling procedures and results of surge control system simulations seldom contain validation data achieved through actual testing. This type of transient test data for a dynamic surge condition is often difficult to obtain. The primary objective of this work is to develop experimental transient compressor surge data on a full-scale test facility, which would facilitate the verification and comparison of existing and future transient surge models. Results of the testing and model comparisons will be documented. Relevant, dimensionless parameters will be presented and validated utilizing the test data. Conclusions from the testing and recommendations for the transient analysis software will be provided.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Typical map of a variable speed centrifugal compressor

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Figure 2

Surge avoidance system schematic

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Figure 4

Piping and instrumentation diagram for MRF

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Figure 5

High frequency pressure transducer in discharge pipe

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Figure 6

Steady state compressor head-flow map for two speeds

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Figure 7

Transient shutdown loci measurements for 17,800 rpm

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Figure 8

Transient shutdown loci measurements for 19,800 rpm

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Figure 9

Pressure versus time at different locations

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Figure 10

Compressor actual flow, head and speed, and recycle valve position versus time

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Figure 11

Differential pressure over unit valves

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Figure 12

Measured versus calculated speed decay

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Figure 13

Compressor map with measured and simulated transient events

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Figure 14

Predictions using measured and calculated speed decay

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Figure 15

Temperature model predictions versus measured data

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Figure 16

Pressure model predictions versus measured data

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Figure 17

ASV size sensitivity study from 19,800 rpm




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