Rolls-royce 1004227 User Manual download pdf (Page 19)

EPR Proprietary I Licensed Material

Introduction

1-3

Risk Trends

Based upon the review of the designs from all of the manufacturers, several trends are readily

apparent. These trends in the development of advanced designs involve incorporation of current

industrial combustion turbine technology, transfer of aircraft engine technology to industrial

combustion turbines, and new technologies developed specifically for industrial combustion

turbines. The subsections below discuss these trends in general terms and categorize the trends

in terms of relative risk (Low Medium, or High).

Current Technology Trends Related to Industrial Combustion Turbines: Low Risk

Elements of aero-derivative class technology developed in the 1970s form the basic design

foundation of the aero-derivative type machines of today. These designs have been refined over

time to provide proven, reliable, and maintainable designs while allowing the users the

maximum degree of flexibility in plant designs or configurations. These design trends, which

can be considered relatively low risk with respect to product reliability, include:

• High Degree of Modularity and Interchangeability

• Flight engine heritage provides for modular construction with separate sections completely

interchangeable with other like modules.

• Compact size allows for ease of maintenance and allows for easy removal in sections or in its

entirety with relatively common tools.

• Bolted on accessories and on-engine instrumentation that is accessible and designed for ease

of removal and replacement.

• High degree of commonality with the flight engine to retain durability gains of proven

hardware and retain lower costs due to higher production rates.

• Pre-tested packaged power units with small foot print for multiple units per site

• Fast starting and loading with tolerances to cycling duty.

• Easily adapted to cogeneration and combined cycle configurations.

Applied Aero Technology Trends Directly Transferred to Industrial Combustion

Turbines: Low to Medium Risk

Technology transfer with minimum risk to industrial aero-derivative and frame type combustion

turbines based on proven designs from the military/commercial combustion turbine have been

accomplished with CAE/CAD/CAM programs and analyses. The result is dramatic efficiency

and airflow performance improvements (e.g. air and gas flow paths) without impacting the

reliability or availability of the combustion turbine. Variable position compressor vanes have

contributed to improved part load performance and are desirable for DLE combustion.

Aerodynamic 2D and 3D designs have improved surge margins, compressor efficiency, and

general operability ranges. The aero-derivative compressors are sensitive to the occurrence of

surge and usually require a borescope inspection after a surge occurs to inspect for any

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Rolls-royce 1004227 User Manual Page 19