Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Gas Turbine Combined Cycle Dynamic Simulation: A Physics Based Simple Approach

[+] Author and Article Information
S. Can Gülen

e-mail: scgulen@bechtel.com

Kihyung Kim

e-mail: kihyung.kim@ge.com

GE Power & Water,
1 River Road,
Schenectady, NY 12345

1Corresponding author.

2Currently at Bechtel Power, 5275 Westview Dr., Frederick, MD 21703.

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 20, 2013; final manuscript received August 28, 2013; published online October 25, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(1), 011601 (Oct 25, 2013) (15 pages) Paper No: GTP-13-1317; doi: 10.1115/1.4025318 History: Received August 20, 2013; Revised August 28, 2013

This paper describes a simplified physics-based method derived from fundamental relationships to accurately predict the dynamic response of the steam bottoming cycle of a combined cycle power plant to the changes in gas turbine exhaust temperature and flow rate. The method offers two advantages: (1) rapid calculation of various modes of combined cycle transient performance such as startup, shutdown, and load ramps for conceptual design and optimization studies, and (2) transparency of governing principles and solution methods for ease of use by a wider range of practitioners. Thus, the method facilitates better understanding and dissemination of said studies. All requisite formulas and methods described in the paper are readily amenable to implementation on a computational platform of the reader's choice.

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Fig. 1

Typical gas turbine start characteristics for CC startup after an overnight shutdown [34]

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Fig. 2

Approximate solution setup for an arbitrary gas temperature T (t) (see Eqs. (3) and (4))

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Fig. 3

Dynamic response of selected HRSG heat exchanger sections during a cold start [14]. The orange dashed arrow-line indicates the increasing time constant of the respective sections with increasing distance from the HRSG gas inlet.

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Fig. 4

Thermal stress as a function of the temperature gradient in the solid body. The shaded area represents the yield strength of typical alloy steels.

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Fig. 5

Maximum allowable admission steam ramp rates

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Fig. 6

HP section temperature and rotor stress profiles for a GTCC ST during prewarming and rolling [17]

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Fig. 7

“Cold” startup for a 400 MW GTCC (3PRH, single-shaft). Thick dotted lines are from Ref. [34]. Rated performance data are assumptions.

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Fig. 8

Predicted steam flows for the GTCC startup in Fig. 7

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Fig. 9

Predicted steam temperatures for the GTCC startup in Fig. 7 (566 °C (1050 °F) rated HP and HRH)

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Fig. 10

Predicted steam pressures for the GTCC startup in Fig. 7 (125/2025/4 bar rated HP/IP/LP, respectively)

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Fig. 11

Predicted IP rotor stress for the GTCC startup in Fig. 7

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Fig. 12

Predicted HP drum stress for the GTCC startup in Fig. 7




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