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GAS TURBINE FOULING OFFSHORE; EFFECTIVE ONLINE WATER WASH THROUGH HIGH WATER-TO-AIR RATIO

[+] Author and Article Information
Stian Madsen

Statoil ASA, Stavanger, Norway
sm28@statoil.com

Lars E. Bakken

NTNU, Norwegian University of Science and Technology, Department of Energy and Process Engineering, Trondheim, Norway
lars.e.bakken@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4041002 History: Received June 22, 2018; Revised July 06, 2018

Abstract

Optimized operation of gas turbines is discussed for a fleet of eleven GE LM2500PE engines at a Statoil North Sea offshore field in Norway. Three engines are generator drivers and eight engines are compressor drivers. Several of the compressor drive engines are running at peak load (T5.4 control), hence production rate is limited by the available power from these engines. The majority of the engines discussed run continuously without redundancy, hence gas turbine uptime is critical for the field's production and economy. The performance and operational experience with online water wash at high water-to-air ratio, as well as successful operation at longer maintenance intervals and higher average engine performance are described. Water-to-air ratio is significantly increased compared to the OEM limit (OEM limit is 17 l/min which yields approx. 0.5% water-to-air ratio). Today the engines are operated at a water rate of 50 l/min (3 times the OEM limit) which yields a 1.4% water-to-air ratio. Such a high water-to-air ratio has been proven to be the key parameter for obtaining good online water wash effectiveness. Possible downsides of high water-to-air ratio have been thoroughly studied.

Copyright (c) 2018 by ASME
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