The Brayton-Joule Cycle
Objectives:
• Explain Brayton-Joule cycle using schematic and t-s/p-v
• Discuss fluids involved and their properties
• Explain the power plant and its most important components
• Discuss the inlet and outlet values of the working fluid using schematic
• Calculate efficiency of turbine using the energy equation from fluid mechanics and the efficiency of the cycle using thermodynamic Some assumptions will be made before the explanation, to make the analysis easier and familiar to us.
• Air is considered to be ideal gas,
• Brayton cycle used is assumed to be closed cycle with cooling for exhaust gases,
• Steady flow is assumed,
• Friction forces and any resistive forces are neglected.
Brayton cycle
(Ideal case)
1-2 Isentropic
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The flow of the large amount of air into the compressor creates high noise levels. A Silencer in the intake duct reduces the noise to acceptable levels.
1. Compressor.
Compresses sucked in atm. air, has 17 stages each stage has its own rotor blade and stationary blade. Rotor blade rotates to increase pressure and reduce velocity of air. LIKE NOZZLE. Stat. blade like stator doesn’t move inc. pressure and also help to reduce velocity.
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The compressor sucks in air form the atmosphere and compresses it to pressures in the range of 15 to 20 bar. The compressor consists of a number of rows of blades mounted on a shaft. This is something like a series of fans placed one after the other. The pressurized air from the first row is further pressurised in the second row and so on. Stationary vanes between each of the blade rows guide the air flow from one section to the next section. The shaft is connected and rotates along with the main gas turbine.
2. Combustor.
Uses fuel to increase temp. of air which will give sufficient energy to the turbine for us to produce sufficient amounts of electricity.
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Talk about fuel price of natural gas fuel
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