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Combined Gas Power Plant

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Gas plant
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   COMBINED GAS TURBINE PLANT          How do Gas Turbines work Gas turbines are comprised of three primary sections mounted on the same shaft: the compressor, the combustion chamber (or combustor) and the turbine.Air is drawn in and compressed which raises the temperature of the air. The compressed air is mixed with fuel injected through nozzles in the combustion chamber and ignited under constant pressure.The hot exhaust gases are directed through the the turbines which imparts rotation to the blades. The rotation of the shaft drives the compressor to draw in and compress more air to sustain continuous combustion. The remaining shaft power is used to drive a generator which produces electricity. Approximately 55 to 65 percent of the power produced by the turbine is used to drive the compressor. Because the compressor must reach a certain speed before the combustion process is continuous, initial momentum is imparted to the turbine rotor from an external motor. Once the turbine reaches self-sustaining speed  –  above 50% of full speed  –  the power output is enough to drive the compressor, combustion is continuous, and the starter system can be disengaged. The temperature at which the turbine operates also impacts efficiency, with higher temperatures leading to higher efficiency. However, turbine inlet temperature is limited by the thermal conditions that can be tolerated by the turbine blade metal alloy. Gas temperatures at the turbine inlet can be 1200ºC to 1400ºC, but some manufacturers have boosted inlet temperatures as high as 1600ºC by engineering blade coatings and cooling systems . Because of the power required to drive the compressor, energy conversion efficiency for a simple cycle gas turbine power plant is typically about 30 percent, with even the most efficient designs limited to 40 percent. A large amount of heat remains in the exhaust gas, which is around 600ºC as it leaves the turbine. How do steam turbines work The steam turbine system consists of several components, such as: compressors, pumps, boilers, combustion chamber, condenser and turbine. Steam enters into the turbine through a nozzle. In the nozzle, heat energy from steam is converted into kinetic energy and the steam is expanding. Steam pressure at the exit of nozzle is smaller when compared with at the time of enter into nozzle, but otherwise the velocity of steam out from nozzle is greater than at the time of enter into the nozzle.The steam gushing out of the nozzle is directed to the turbine blades .If the steam still has velocity when it leaves the turbine blades means that only some of the kinetic energy of steam is taken by the turbine blades which are running. More than one line of blade motion is installed to utilize the remaining kinetic energy when steam leaves the turbine blades.  
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