Operation of a Single Shaft Gas Turbine

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)

G6551B [140590;140620] Generator Drive Simple Counter Clockwise Continuous 5114 rpm Mark v Speedtronic Solid State electronic Control System Overspeed,Overtemperature,Vibration

Cooldown mechanism Open cycle mode Rating (base load Naphtha) Peak load Naphtha Bearing Assemblies Quantity Lubrication No.1 bearing assembly (located in inlet casing assembly) Journal No. 2 Bearing assembly (located in exhaust frame) Starting System Starting Device Type Torque Converter Type Fuel System Operating Type Fuel manual signal Fuel oil pump Flow Divider Fuel oil stop valve Lubrication System Lubricant Total capacity Bearing Header pressure Main lube pump Auxiliary lube oil pump Emergency lube oil pump

and flame detection Ratchet device integral with torque converter. 36.310 KW 40.870 KW 2 Pressure lubricated Active and reactive thrust and journal all contained in one assembly. Elliptical Elliptical journal

Diesel Motor 420 KW,2300 rpm Detroit U-71 Hydraulic with integral reversing gear and ratchet and manual actuation. Naphtha/ HSD. Speedtronic Mark v turbine control panel Electric motor driven. In-line, Free wheeling 10 elements. Electrohydraulic servo control Lube oil 6400 litres 1.73 bar Shaft driven, integral with accessory gear. AC motor driven,vertical submerged, centrifugal type. DC motor driven,centrifugal type.

Gas Turbine Generator Horizontal a.c generator with a single bearing, mounted with a gearbox on a common base. Output Voltage Rated Power Factor No. of poles Insulation class Enclosure Cooling Air gap Generator noise level Coolant Coolant temperature Coolant Flow Exciter Frame Size Air gap Excitation for Normal voltage, no load Generator rated load Permanent Magnet Generator for AVR supply Frame Size Nominal rated output Total weight of the generator package

45388 KVA 11000 V ,Three Phase 0.8 lag 4 F IP 54 IC 8AIW 7 CACW 23mm on centerline of each pole 85db Fresh water 34 C 54 litres/sec on one stack for rated output. MAJ51M20 2.3 mm 2.4 A, 18 V at 20 C 2.6 A 69 V at 75 C 55/40 810 VA 210 Three phase 120 Tonnes