Research Papers: Gas Turbines: Oil and Gas Applications

Assessment of Compressors in Gas Storage Applications

[+] Author and Article Information
Rainer Kurz

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

Klaus Brun

Rotating Machinery and Measurement Technology, Department of Fluids Engineering, Mechanical and Materials Engineering Division, Southwest Research Institute, San Antonio, TX 78238klaus.brun@swri.org

We prefer isentropic head and efficiency over polytropic head and efficiency because the isentropic head can be directly derived from station design parameters (i.e., gas composition, suction temperature and pressure, and discharge pressure), whereas the definition of the polytropic head requires the additional knowledge of the compressor efficiency or the discharge temperature.

Standard conditions are p=14.7psi (absolute) and T=60°F. Similarly, normal conditions are specified at p=101.325kPa and T=0°C.

J. Eng. Gas Turbines Power 132(6), 062402 (Mar 30, 2010) (7 pages) doi:10.1115/1.4000147 History: Received May 05, 2009; Revised May 22, 2009; Published March 30, 2010; Online March 30, 2010

An analytical model is generated that allows the evaluation of the compression system. It is also used to derive general rules for optimizing a system. Several strategies for the compression system (single compressors, multiple compressors with a single driver in series and parallel configuration, and multiple compressors with individual drivers) are evaluated based on the said model.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Compressor map with lines of constant power

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Figure 2

Typical compressor map

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Figure 3

Compressors operating in series and in parallel. LP and high pressure (HP) compressors can have separate drivers or are part of a train using a single driver.

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Figure 4

Composite coverage maps for two compressors capable of operating in series and in parallel

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Figure 5

Influence of C2 (steepness of the p2-flow curve at constant power) on filling time T for different choices of initial flow Q0

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Figure 6

Evaluation of Eq. 27 for case with constant efficiency (eta=const) and case where efficiency is reduced on either side of BEP(variable eta). The curves show the behavior of the terms dη/dQ, η/Q, and dη/dQ-η/Q in Eq. 27.



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