23-05-2012, 03:24 PM
Gas Turbine Technologies for Electric Generation
Gas Turbine Technologies Presentation.ppt (Size: 6.31 MB / Downloads: 314)
Types of Gas Turbine Plants
Simple Cycle
Operate When Demand is High – Peak Demand
Operate for Short / Variable Times
Designed for Quick Start-Up
Not designed to be Efficient but Reliable
Not Cost Effective to Build for Efficiency
Combined Cycle
Operate for Peak and Economic Dispatch
Designed for Quick Start-Up
Designed to Efficient, Cost-Effective Operation
Typically Has Ability to Operate in SC Mode
Principles of Operation
Compressor
As air flows into the compressor, energy is transferred from its rotating blades to the air. Pressure and temperature of the air increase.
Most compressors operate in the range of 75% to 85% efficiency.
Combustor
The purpose of the combustor is to increase the energy stored in the compressor exhaust by raising its temperature.
Turbine
The turbine acts like the compressor in reverse with respect to energy transformation.
Most turbines operate in the range of 80% to 90% efficiency.
Cogeneration Plant
A Cogeneration Plant
Power generation facility that also provides thermal energy (steam) to a thermal host.
Typical thermal hosts
paper mills,
chemical plants,
refineries, etc…
potentially any user that uses large quantities of steam on a continuous basis.
Good applications for combined cycle plants
Require both steam and electrical power
Major Combined Cycle Plant Equipment
Combustion Turbine (CT/CTG)
Steam Generator (Boiler/HRSG)
Steam Turbine (ST/STG)
Heat Rejection Equipment
Air Quality Control System (AQCS) Equipment
Electrical Equipment