17-07-2012, 03:01 PM
Turbine Cycle Heat Rate And Factors Affecting The Cycle Heat Rate
Turbine Cycle Heat Rate .pptx (Size: 296.27 KB / Downloads: 56)
TURBINE DEFINITION
A turbine or a turbo machine is a device that exchanges energy with a fluid using continuously flowing fluid and rotating blades.
The basic mechanism of turbine
1. The fluid flows directly into the device in an axial direction.
2. The stator blades turn the flow so that it is lined up with the turbine blades.
3. The turbine blades turn the flow back towards the axial direction and turn the output shaft.
HP CASING (HIGH PRESSURE CASING)
Made up of Cr-Mo-V alloy casting
Coaxial double casing type
Steam after expansion move from inner casing to outer casing
Outer casing constitutes front and rear chambers for gland steam
LP CASING (low PRESSURE CASING)
Double flow type
Three extractions for feed water heaters
Exhaust is rigidly connected with condenser
In Detail Heat Rate Is
Turbine cycle heat rate is a measure of the turbine efficiency. It is determined from the ratio of total energy input supplied to the turbine to the electrical energy output.The total energy supplied is the sum of the steam mass flow rates to the turbine multiplied by their respective enthalpies. The energy leaving is the sum of mass flow rates exiting the turbine multiplied by their respective enthalpies. Taking the difference in the total energy supplied and leaving to the electrical output and this gives you heat rate, typically expressed in Btu/kWh or kJ/kWh.