Operation of a Single Shaft Gas Turbine

December 28, 2017 | Author: rajan | Category: Gas Turbine, Turbine, Gas Compressor, Combustion, Transmission (Mechanics)
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Operation of a Single Shaft Gas Turbine The Gas Turbine rotor is initially accelerated to the ignition speed (approx. 18% of rated speed) by the starting equipment. Until ignition has taken place, the starting equipment alone provides the drive power needed to accelerate the gas turbine rotor. After ignition has occurred, the gas turbine rotor itself provides a certain amount of power, which together with the power from the starting equipment accelerates the rotor to approximately 60% of the rated speed. After reaching this speed, the self maintaining speed, the starting equipment is automatically decoupled and the gas turbine rotor accelerates of its own up to its rated speed of 5100 rpm. Ambient air is sucked in by the axial compressor and is cleaned in the filter house. It then flows through the inlet duct to the compressor inlet (1). It is then compressed in the individual stages of the 17 th stage axial compressor (2) and fed to the ten stage combustion chambers. Fuel is fed into the combustion chamber through nozzles and mixed with the present air to an ignitable mixture. The air fuel mixture is ignited by spark plugs. The flow of hot gases generated in the combustion chambers (3) is fed at a certain pressure and temperature through transition pieces to the first stage nozzle ring. The vanes of the nozzle ring increase the flow of hot gases and guide it into the buckets of the first turbine stage, where the thermal energy present at the inlet side of the bucket stage is converted into torque. The stream of hot gas flowing out of the discharge side of the first stage turbine wheel still contains thermal energy and is fed into the second and third turbine stage. The functional procedure in this turbine stage are the same as in the first stage. At the discharge of the third stage, the hot gas flow is again at atmospheric pressure and it flows with a temperature of approx. 500 C through the exhaust stack into the atmosphere. The drive power generated in the three turbine stages drives the axial compressor and the generator. The sense of rotation of the gas turbine rotor is counterclockwise, viewed from the compressor inlet to the exhaust. Gas Turbine Design Data Model series Application Cycle Shaft Rotation Type of operation Shaft Speed Control Protection (Basic types)

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