New Challenges and Design for High Mach High Flow Coefficient Impeller for Large Size LNG Plant

Abstract

The new generation of LNG plant are moving toward a larger size, that mean larger compression stations, driven by higher power gas turbine that can arrive and exceed 100 MW. This increase of specific power means also increase in compression gas flow and so the need to have compressors that are able to handle it in efficient way. This is true in particular for impeller stages equipping the Propane Compressors that will be selected at higher specific flow coefficient and Mach number. The present paper illustrates an improved impeller stage designed in particular to fit this duty, the need of a multidisciplinary optimization, from aerodynamic, structural mechanic, aeromechanic and rotordynamic. The paper illustrates the main design challenges for this type of impeller design, the validation done by the OEM and the benefits of their usage by mean of dedicated Case studied.