Research Papers: Gas Turbines: Turbomachinery

Modeling of a Steam Turbine Including Partial Arc Admission for Use in a Process Simulation Software Environment

[+] Author and Article Information
Eric Liese

Department of Energy,
National Energy Technology Laboratory,
3610 Collins Ferry Road,
Morgantown, WV 26507-0880
e-mail: eric.liese@netl.doe.gov

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 15, 2014; final manuscript received January 31, 2014; published online June 3, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(11), 112605 (Jun 03, 2014) (7 pages) Paper No: GTP-14-1029; doi: 10.1115/1.4027255 History: Received January 15, 2014; Revised January 31, 2014

A dynamic process model of a steam turbine, including partial arc admission operation, is presented. Models were made for the first stage and last stage, with the middle stages assumed to have a constant pressure ratio and efficiency. A condenser model is also presented. The paper discusses the function and importance of the steam turbine's entrance design and the first stage. The results for steam turbines with a partial arc entrance are shown and compare well with experimental data available in the literature; in particular, the “valve loop” behavior as the steam flow rate is reduced. This is important to model correctly since it significantly influences the downstream state variables of the steam, and thus the characteristic of the entire steam turbine, e.g., state conditions at extractions, overall turbine flow, and condenser behavior. The importance of the last stage (the stage just upstream of the condenser) in determining the overall flow rate and exhaust conditions to the condenser is described and shown via results.

Copyright © 2014 by ASME
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Fig. 1

Plot of stage efficiency (Eq. (1)) for various blade reactions

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Fig. 2

Efficiency movement during sequential valve closings

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Fig. 3

Comparing the general flow and Stodola equation

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Fig. 4

Example TEL curve used in model presented

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Fig. 6

Relationship between master position and power

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Fig. 7

First stage trends for partial admission

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Fig. 8

Comparing HP ST efficiencies

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Fig. 9

Temperature entering the reheater

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Fig. 10

Mass flow rate for different control methods

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Fig. 11

Last stage and condenser results




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