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Research Papers: Gas Turbines: Industrial & Cogeneration

Oil Mist Eliminator Vessel Modifications for GE 7EA Gas Turbine

[+] Author and Article Information
Steve Ingistov

 BP/WCC, 22850 South Wilmington Avenue, Carson, CA 90745

Roger Cusack

 Koch-Glitsch, LP, 4111 East 37th Street North, Wichita, KS 67220

Rakesh Bhargava

 Foster Wheeler USA Corporation, 585 North Diary Ashford, Houston, TX 77079

J. Eng. Gas Turbines Power 133(11), 112002 (May 19, 2011) (6 pages) doi:10.1115/1.4002871 History: Received July 27, 2010; Revised August 03, 2010; Published May 19, 2011; Online May 19, 2011

With any rotating machinery as lube oil leaves bearings, a certain amount of lube oil is aerated, resulting in the formation of a mist of very small size (less than 1 μm diameter) particles. If oil mist elimination system is not sized and designed properly, it could cause various issues such as increased operation and maintenance cost, re-entry of oily air into adjacent gas turbine units, fouling of surrounding atmosphere, and creation of oil slick on concrete floors, besides impacting environmental requirements and safety hazards. This paper presents a case study involving GE 7EA gas turbines operating at the Watson Cogeneration Plant and discusses issues with the existing oil mist elimination system and steps taken for a successful replacement of the original equipment manufacturer (OEM) supplied mist elimination system with non-OEM designed and fabricated mist elimination system. The replaced system demonstrated significantly higher life expectancy than it was designed for.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross section of GE 7EA gas turbine showing bearing No. 2 and the hydrant

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Figure 2

A schematic illustrating the paths of sealing air and oily air for bearing No. 2 of GE 7EA gas turbine

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Figure 3

Compressor discharge air routes in relation to bearing No. 2 of GE 7EA gas turbine

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Figure 4

A schematic of the OEM supplied original mist eliminator vessel configuration

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Figure 5

A schematic of the new mist eliminator vessel with two coaxial elements and original extractor fan

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Figure 6

Pressure measurement locations for new mist eliminator vessel

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Figure 7

Third-party designed and manufactured mist eliminator vessel in operation

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Figure 8

Three principles for designing lube oil mist eliminator vessel

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Figure 9

Removal efficiency versus droplet diameter for a mist eliminator

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