Aeroderivative Engines in LNG Liquefaction Mechanical Drive Applications

Over the last 50 years of the LNG industry, there has been a significant evolution in the drivers used to power liquefaction compressors. For several decades, steam turbines were utilized and the first gas turbines were deployed in 1969. In a LNG liquefaction plant, the gas turbine drivers and refrigeration compressors strongly influence overall plant performance and efficiency. After the first Aeroderivative solution was applied at Darwin LNG in 2006, there has been a significant growth in the application of these engines for LNG mechanical drive. This trend is driven by the need to reduce greenhouse gas emissions, and fuel auto-consumption, which in a feed gas constrained situation, boosts LNG output. Aeroderivatives tends to increase plant availability. This paper reviews the market penetration of Aeroderivatives into the LNG liquefaction sector highlighting the fundamental differences between Aeroderivative, and heavy duty engines. The background, historical deployment and technical issues relating to the use of Aeroderivative engines for LNG mechanical drive are addressed. Qualification programs for new engines and technologies such as inlet chilling for power augmentation as implemented in LNG plants are reviewed.