Gas Turbine Power Plant

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  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • August 31, 2013
  • Gas Turbine Power Plant

    1. 1. Gas Turbine Power Plant By H.Deivanayagam Government college of engineering, Tirunelveli, Tamilnadu.
    2. 2. August 31, 2013 2 Unit III – Power plant engineering Gas turbine power plant Working principle : Air is compressed(squeezed) to high pressure by a compressor. Then fuel and compressed air are mixed in a combustion chamber and ignited. Hot gases are given off, which spin the turbine wheels.
    3. 3. August 31, 2013 3 Unit III – Power plant engineering Gas turbine power plant Description: Gas turbines burn fuels such as oil, nature gas and pulverized(powdered) coal. Gas turbines have three main parts: i) Air compressor ii) Combustion chamber iii) Turbine
    4. 4. August 31, 2013 4
    5. 5. August 31, 2013 5 Unit III – Power plant engineering Gas turbine power plant Air compressor: The air compressor and turbine are mounted at either end on a common shaft, with the combustion chamber between them. Gas turbines are not self starting. A starting motor is used. The air compressor sucks in air and compresses it, thereby increasing its pressure.
    6. 6. August 31, 2013 6 Unit III – Power plant engineering Gas turbine power plant Combustion chamber: In the combustion chamber, the compressed air combines with fuel and the resulting mixture is burnt. The greater the pressure of air, the better the fuel air mixture burns. Modern gas turbines usually use liquid fuel, but they may also use gaseous fuel, natural gas or gas produced artificially by gasification of a solid fuel.
    7. 7. August 31, 2013 7 Unit III – Power plant engineering Gas turbine power plant Turbine: Hot gases move through a multistage gas turbine. Like in steam turbine, the gas turbine also has stationary and moving blades. The stationary blades guide the moving gases to the rotor blades adjust its velocity. The shaft of the turbine is coupled to a generator.
    8. 8. August 31, 2013 8 Unit III – Power plant engineering Gas turbine power plant… Applications of gas turbine: drive pumps, compressors and high speed cars. aircraft and ships.  Power generation (used for peak load and as stand- by unit).
    9. 9. August 31, 2013 9 Open cycle gas turbine power plant
    10. 10. August 31, 2013 10 Closed cycle gas turbine power plant
    11. 11. August 31, 2013 11 Advantages of gas turbine power plant  Storage of fuel requires less area and handling is easy.  The cost of maintenance is less.  It is simple in construction. There is no need for boiler, condenser and other accessories as in the case of steam power plants.  Cheaper fuel such as kerosene , paraffin, benzene and powdered coal can be used which are cheaper than petrol and diesel.  Gas turbine plants can be used in water scarcity areas.  Less pollution and less water is required.
    12. 12. August 31, 2013 12 Disadvantages of gas turbine power plant  66% of the power developed is used to drive the compressor. Therefore the gas turbine unit has a low thermal efficiency.  The running speed of gas turbine is in the range of (40,000 to 100,000 rpm) and the operating temperature is as high as 1100 – 12600 C. For this reason special metals and alloys have to be used for the various parts of the turbine.  High frequency noise from the compressor is objectionable.
    13. 13. Thank you!!

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