GE manual GE5 Gas Turbines, Compressor

GE5 Gas Turbines

The new GE5 is a compact, state-of-the-art, 6 MW class industrial gas turbine. The unit was developed in two configurations: a cold-end drive single shaft for power generation and a hot- end drive twin shaft for mechanical drive applications. Maximum commonality has been maintained between the single and twin shaft models. Both units share a common gas generator, with operating and maintenance benefits in installations where mixed operation is required. The twin shaft engine is obtained by simply removing the second stage turbine from the single shaft unit and adding a two-stage power turbine.

The unit is an evolution of the existing PGT5 which builds on the experience of the successful GE10 model. The merging of proven GE Aircraft Engines and GE Energy - Oil & Gas technology coupled with the benefits of GE’s Six Sigma Total Quality Methodology have resulted in a rugged machine with high efficiency and reliability, and low operating and maintenance cost.

The high efficiency of the machine coupled with low emissions make the GE5 a leader in its class for most applications.

While the single shaft version is particularly suitable for power generation and cogeneration due to the high exhaust temperature, the twin shaft version, with wide operating speed range, is designed to be a reliable and efficient mechanical drive for compressors and pumps.

COMPRESSOR

The GE5 compressor benefits from several decades of compressor design evolution focused on achieving higher efficiency. The new compressor is scaled from the similar GE10 unit. It is a high performance, axial flow design derived from GE Aircraft Engine technology. GE Energy, utilizing GE Aircraft Engine expertise, has greatly improved overall compressor performance without sacrificing reliability or mechanical integrity.

The 11-stage compressor produces a pressure ratio of 14 8:1. The first three stages of stator blades are adjustable to optimize efficiency by maximizing exhaust gas temperature at part load operation. Compressor blades are assembled onto a solid forged rotor while stator blades are mounted onto ductile cast iron casings.

TURBINE

The HP turbine itself is a compact, high efficiency design with two stages in the single shaft version and three stages in the twin shaft model (2 in the LPT Turbine). The advanced design methodology utilized by GE Energy resulted in a high performance machine with significantly fewer parts. In addition, state-of-the- art cooling techniques permitted the use of well proven materials.

The GE5 uses an enhanced nozzle and bucket design similar to those used in aircraft engines. Cooling air is provided to the first stage nozzles and buckets to enable higher firing temperatures and enhanced efficiency.

The LP turbine of the twin shaft version has two stages

4 GE Energy Gas Turbines