Series and Parallel Inductors
Measurement of Loss
Insulation Resistance Measurement
Ampere's Circuital LawClosely Related Articles
Thermal Power Plant
Hydro Power Plant
Nuclear Power Station
Diesel Power Station
Seebeck Power Generation
Cost of Electrical Energy
Gas Turbine Power Plant
Methods of Firing Steam Boiler
Fire Tube Boiler
Water Tube Boiler
Steam Boiler Function
Feed Circuit of Boiler
Boiler Feed Water Treatment
Coal Combustion Theory
Fluidized Bed Combustion
Condenser of Turbine
Surface Steam Condenser
Economics of Power Generation
Cooling Tower Performance
Components of Cooling Tower
Power Plant Fire Protection System
MVWS Fire Protection
Foam Fire Protection System
Fire Detection System
Gas Extinguishing System
Solar Energy System
Types of Solar plant
Components of a Solar Generating System
Staebler Wronski Effect
Principle of Photovoltaic Cell
Characteristics of Solar Cell
Solar PV Module
Standalone Solar Electric System
Steam Dryness Fraction
Properties of Vapour
How to Calculate Steam Consumption During Plant Start Up
Steam Distribution System
Engineering Thermodynamics Part 2
First Law of Thermodynamics
Rankine Cycle and Regenerative Feed Heating
Rankine Cycle Cogeneration
Ideal Verses Actual Rankine Cycle
Wind Energy Generation
Theory of Wind Turbine
Gas Turbine Power Plant
Then this highly compressed hot air is released from the combustion chamber through the nozzle to a turbine, called gas turbine. During expansion of pressurized and hot air, mechanical work is done to rotate the turbine. As the turbine rotates, the alternator also rotates since a common shaft is shared by both turbine and alternator in the gas turbine power plant. It is needed to be mentioned here that not only the turbine and alternator, the air compressor is also fitted on the same shaft.This is because the mechanical power developed by the gas turbine can be shared by the air compressor for its operation along with the alternator. The mechanical energy required to compress the air must be more than the mechanical energy developed by the compressed air. But here the mechanical energy developed in the gas turbine by compressed air contributes both for compressing the air and producing the electricity. How can it be possible? The answer to this question is that the required energy developed in the system comes from the heat energy produced by combustion of fuel. Here, in the gas turbine power plant, compressed air only acts as a fluid. This type of power plant is not used for producing electrical power in commercial scale but normally used as a standby plants in a hydroelectric station for supplying auxiliary electricity during starting of the main power plant.
Advantages of Gas Turbine Power Plant
- There is no need of boiler as in the case of a steam power generating plant. As the boiler is not used the auxiliaries associated with the boiler are also absent in the gas turbine power plant hence the design is much simpler than the steam power plant.
- For the same reasons as mentioned above, the size of the gas turbine power plant is much smaller than that of a same capacity steam power plant.
- The manufacturing, engineering, installation and commissioning costs are much lower. The running cost is also less than that of same rated steam power plant.
- As the design and construction are simpler than a same capacity steam power plant, the maintenance cost also smaller in the gas turbine power plant.
- Gas turbine itself is much simpler in design and construction than a steam turbine.
- This power plant can be started much quickly even in cold condition.
- In steam power plant the boiler is kept operative even at off-load condition because restarting a boiler is much expensive and time-consuming process. But in the case of a gas turbine power plant entire plant can be kept inoperative at offload condition. Hence, this system is free from standby losses.
Disadvantages of Gas Turbine Power Plant
- For running the gas turbine system, compressed air is required. When the plant runs, the compressor runs and supplies the required compressed air. But when the plant just starts its operation, there is no compressed air previously available but this required compressed air cannot be produced before the compressor is run. The drawback of the system can be overcome by running the compressor by some external means before actual starting the plant.
- In this system, a major part of the mechanical power developed by the gas turbine is utilized to run the compressor which causes the low output of the system.
- A major portion of the heat energy of fuel combustion is lost to exhaust air. The exhaust heat cannot be reutilized efficiently like as in the case of a steam power plant.
- The internal temperature of the combustion chamber is very high. This highly tempted part of the system reduces the overall life span of a gas turbine power plant compared to other forms of a power plant.
Closely Related Articles Electric Power GenerationPower Plants and Types of Power PlantThermal Power Generation Plant or Thermal Power StationHydro Power Plant | Construction Working and History of Hydro power plantNuclear Power Station or Nuclear Power PlantDiesel Power StationWhy Supply Frequency is 50 Hz or 60 Hz?Economiser in Thermal Power Plant | EconomiserMHD Generation or Magneto Hydro Dynamic Power Generation Cogeneration | Combined Heat and PowerThermoelectric Power Generators or Seebeck Power GenerationCost of Electrical EnergyNuclear ReactorMore Related Articles Steam Boiler | Working principle and Types of BoilerMethods of Firing Steam BoilerFire Tube Boiler | Operation and Types of Fire Tube BoilerWater Tube Boiler | Operation and Types of Water Tube BoilerSteam Boiler Furnace Grate Firebox Combustion Chamber of FurnaceFeed Water and Steam Circuit of BoilerBoiler Feed Water Treatment Demineralization Reverse Osmosis Plant DeaeratorCoal Combustion TheoryFluidized Bed Combustion | Types and Advantages of Fluidized Bed CombustionSteam Condenser of TurbineJet Condenser | Low Level High Level Ejector Jet CondenserSurface Steam Condenser Economics of Power GenerationCooling Tower Useful Terms and Cooling Tower PerformanceCooling Tower Material and Main ComponentsPower Plant Fire Protection SystemHydrant System for Power Plant Fire ProtectionMedium Velocity Water Spray or MVWS System for Fire ProtectionFoam Fire Protection SystemFire Detection and Alarm SystemGas Extinguishing SystemSolar ElectricitySolar Energy System | History of Solar EnergyTypes of Solar Power StationComponents of a Solar Electric Generating SystemWhat is Photovoltaic Effect?Staebler Wronski EffectWorking Principle of Photovoltaic Cell or Solar CellSolar CellCharacteristics of a Solar Cell and Parameters of a Solar CellSolar Cell Manufacturing TechnologyWhat is a Solar PV Module?What is Standalone Solar Electric System?Solar LanternSteamSteam Dryness FractionSuperheated Steam and Steam Phase DiagramVapour Properties Mollier Chart Heat CapacitiesWhat is Steam Flashing?How to Calculate Steam Consumption During Plant Start Up Effective Steam Distribution SystemWhat is Water Hammer?Engineering Thermodynamics Part 1Science of Engineering Thermodynamics Part 2Basic Law of Conservation and First Law of Thermodynamics Carnot Cycle and Reversed Carnot CycleEnthalpy Entropy and Second Law of ThermodynamicsRankine CycleRankine Cycle and Regenerative Feed HeatingRankine Cycle for Closed Feed Water Heaters and Rankine Cycle CogenerationIdeal Verses Actual Rankine CycleRankine Cycle Efficiency Improvement TechniquesWind Energy Electricity GenerationTheory of Wind Turbine Wind Turbine | Working and Types of Wind TurbineBasic Construction of Wind TurbineNew Articles Series and Parallel Inductors Electric PowerMeasurement of Losses in Shunt ReactorThree Phase Shunt ReactorMeasurement of Insulation ResistanceAmpere's Circuital Law