As hot combustion gas expands through the turbine, it spins the rotating blades. The rotating blades perform a dual function: they drive the compressor to draw more pressurized air into the combustion section, and they spin a generator to produce electricity.
What is used in gas turbine power plant?
In gas turbine power plant we use high pressure and temperature air instead of high pressure and temperature steam to rotate the turbine. … In a gas turbine power plant, the shaft of turbine, alternator and air compressor are common. The mechanical energy created in the turbine is partly utilised to compress the air.
How does a gas turbine start?
Gas turbine engines come in many shapes and sizes. … The electric motor spins the main shaft until there is enough air blowing through the compressor and the combustion chamber to light the engine. Fuel starts flowing and an igniter similar to a spark plug ignites the fuel.
What are the 3 main components of gas turbine?
The gas turbine has three major sections, namely the compressor, combustor and turbine (although, from a materials perspective, the other major component groups – rotor, casing and auxiliaries – are also of interest). The compressor, combustor and turbine sections are highlighted in Fig. 1.1.
Is used in gas turbine power plants?
The gas turbine can be used in combination with a steam turbine—in a combined-cycle power plant—to create power extremely efficiently. 1. Air-fuel mixture ignites: The gas turbine compresses air and mixes it with fuel that is then burned at extremely high temperatures, creating a hot gas.
What are the four type of gas turbine?
Four types of gas turbine engines are used to propel and power aircraft. They are the turbojet, turbofan, turboprop, and turboshaft.
What are the features of gas turbine?
Main Characteristics of Gas Turbine and Gas Engine
|Gas Turbine||Gas Engine|
|Total Efficiency of Cogeneration (LHV)||80-83%||63.5-77%|
|Electrical Efficiency (Partial Load)||Good||Very Good|
|Exhaust Heat||High exhaut gas temperature and amount||Low exhaust gas temperature|
|NOx Emissions (O2=15%)||15-25ppm (DLE)||57ppm|
What are the four processes of gas turbine principles?
In an ideal gas turbine, gases undergo four thermodynamic processes: an isentropic compression, an isobaric (constant pressure) combustion, an isentropic expansion and heat rejection.
What is the starting sequence of gas turbine engine?
The normal starting sequence is: Rotate the compressor with the starter; Turn the ignition on; and. Open the engine fuel valve, either by moving the throttle to idle or by moving a fuel shutoff lever or turning a switch.
Which fuel is used in gas turbine?
Fuels. One further advantage of gas turbines is their fuel flexibility. They can be adapted to use almost any flammable gas or light distillate petroleum products such as gasoline (petrol), diesel and kerosene (paraffin) which happen to be available locally, though natural gas is the most commonly used fuel.
How long does a gas turbine take to start?
While combined cycle gas turbines can take over 30 minutes to start, combustion engine power plants can start and reach full load in less than 5 minutes – providing flexible, quick-start capability.