NDLI: On-Line Hydrocarbon Dew Point Monitoring in Fuel Gas

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Newbound, T. D. Wagiealla, W. S.
Copyright Year	2003
Abstract	Hydrocarbon dew point in fuel gas has become a recent concern for Saudi Aramco and Saudi Electricity Company (SEC). Together they operate more than 150 land based industrial and aeroderivative combustion gas turbines (CGTs) on natural gas produced in the Eastern Province of Saudi Arabia. Automated on-line hydrocarbon dew point monitoring conducted over the past two years has revealed wide variations in the hydrocarbon dew points of the fuel gas that supply these turbines. During winter months at some locations, hydrocarbon dew points are now known to rise to, and slightly above ambient gas temperatures. Daily variations in dew point temperature average about 12–14 °F (7–8 °C) in winter months with highs occuring in late morning hours. More dramatic changes (60 °F, 33 °C) were recorded and attributed to operational changes in two major gas plants. At a major power generation facility, hydrocarbon dew point data was referenced in time with inlet fuel temperature and inlet fuel pressure recorded from a turbine control system. This data reveals evidence that liquid hydrocarbon was entering the CGT fuel intake. Damage to hot gas path components from liquids in natural gas fuel has cost Saudi Aramco several million dollars over a 10 year period (1985–1995). The estimates are much higher now with expanded use of natural gas into the Central and Western Provinces of Saudi Arabia. The new sources of gas, new processing facilities and longer transmission distances all contribute to greater potential for liquids formation, while upgrades to higher firing temperatures also increases the sensitivity of some CGTs to liquids in the fuel. With dew point monitoring, we will be able to recommend the necessary fuel conditioning equipment and fuel preheating temperatures that will be needed to prevent costly distress to CGTs due to the passage of liquids in the fuel gas.
Sponsorship	International Gas Turbine Institute
Starting Page	113
Ending Page	117
Page Count	5
File Format	PDF
ISBN	0791836878
DOI	10.1115/GT2003-38868
e-ISBN	0791836711
Volume Number	Volume 4: Turbo Expo 2003
Conference Proceedings	ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
Language	English
Publisher Date	2003-06-16
Publisher Place	Atlanta, Georgia, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Gaseous fuels Firing Energy generation Control systems Combustion gases Fuels Damage Pressure Natural gas Turbines
Content Type	Text
Resource Type	Article

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