Design Innovation Papers

Slow-Roll of 40-MW Condensing-Extraction Steam Turbines in a 420-MW Cogeneration Plant

[+] Author and Article Information
Steve Ingistov

e-mail: ingissg@bp.com

Michael Milos

e-mail: michael.milos@bp.com
22850 S. Wilmington Ave.,
Carson, CA 90745

Rakesh K. Bhargava

Hess Corporation,
1501 McKinney Street,
Houston, TX 77010
e-mail: bhargavar1951@gmail.com

Contributed by the Industrial and Cogeneration Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received August 12, 2012; final manuscript received November 11, 2012; published online May 20, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(6), 065001 (May 20, 2013) (7 pages) Paper No: GTP-12-1327; doi: 10.1115/1.4023233 History: Received August 12, 2012; Revised November 11, 2012

This paper describes efforts required to operate a cogeneration facility's extraction-condensing steam turbine generators with flexible rotor design on a slow-roll mode of operation (also called true stand-by). Slow-roll mode of operation became necessary due to changing steam demand from the host refinery, resulting in decreased performance of the steam turbine generators and their associated economic losses. Design modifications implemented to achieve slow-roll of steam turbine generators without affecting reliability and availability of the entire cogeneration facility are discussed in this paper. Successful implementation of the design modifications was demonstrated via extensive field testing on two steam turbine generator units during the summer of 2011. A simple life cycle economic analysis shows the payback period for the project is approximately seven months.

Copyright © 2013 by ASME
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Fig. 1

Schematic of the steam expansion in a steam turbine

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Fig. 2

Steam turbine rotor configuration

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Fig. 3

A view of the steam turbine rotor in the vacuum chamber

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Fig. 4

Part-load performance of the existing steam turbine generator units

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Fig. 5

Layout of the slow-roll line

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Fig. 6

Flow diagram of slow-roll line

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Fig. 7

The performance of vertical condensate pumps for STG units

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Fig. 8

A view of the installed slow-roll line

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Fig. 9

Existing gland sealing system for a steam turbine

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Fig. 10

A schematic showing arrangement to estimate slow-roll steam flow rate




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