1. WELCOME Starting System of 2x14.45 MW GasTurbine & Gas Analyser
By Trainer
Dhritiman Nath M.P. Goswami

2. Content GT: Introduction Starting System of 2x 14.45 MW Gas turbines
Equipment specifications of GT starting system
Gas Turbine Emission Monitoring of MW GTG
Gas Analyzer
Operational condition
Infrared Gas Analyzer
Gas Analyzer System Schematics

3. Gas Turbine : Introduction
A gas turbine is an internal combustion engine which uses gas as its fuel.
Gas turbine works on Brayton cycle as shown below – Q
pressure
volume

4. Rating of 2 x 14.45 MW gas turbine –
Continue……
Rating of 2 x MW gas turbine –
Model : W191G. Simple cycle, Single shaft
Capacity : At site condition of 37.8 degree celcius,100 F
and 120 m above sea level
Rated power : MW
Speed : RPM
Compressor : 15 stages
Turbine : stages
Air flow : kg/sec
Max . Inlet temperature at base load : degree Celsius
Max. Turbine Exhaust Temperature at base load : 421 degree
Celsius

5. Starting of 2x14.42MW Gas Turbine
Gas turbine is not a self starting device.
External prime movers are required to start the turbine .
Equipments involved for starting the turbine are –
Turning Gear
Chain & Sprocket Arrangement
Marland One Way Clutch
Starting diesel with torque converter
Pneumatic clutch & Clutch Air System
Auxiliary gear box
Bearing & Lubrication system

6. Continue….
PALO is first to operate. It will provide the lubricating oil to all the bearings of the system.
Pneumatic clutch will operate second. It will link the Starting equipments to the auxiliary gear box.
Turning gear will operate next. It is having a reduction gear box with chain & sprocket linkage. It will provide the breakaway torque to the turbine. Also required to roll the turbine during cooling cycle.
Diesel engine with torque converter will next come up. It will provide the acceleration to the turbine upto self sustaining speed (385 Gen RPM).
Auxiliary gear box is used to change the speed from one level to another.

7. Stating Diesel Engine
Main Lube Oil Pump
Chain & Sprocket Arrangement
Torque Converter
Marland Oneway Clutch
MOP Flexible Coupling
TG Reduction
Gear Motor
Pneumatic Clutch
Turning
Gear Motor
Rotaseal
GT – AGB
Coupling
OST Mechanism
Air in
GT Shaft

8. Torque converter : This will provide the necessary torque for acceleration

9. Journal bearing : These bearing holds the generator shaft
Journal bearing : These bearing holds the generator shaft. These are hydrodynamic bearing.
After reaching the self sustaining speed of abot 380 RPM , clutch will disengage itself.

10. Equipments specification of GT starting system
PALO KW (30 HP) AC motor, 1800 rpm, 415 V AC
Turning Gear Motor – 3.73 KW (5HP) ,1750 rpm,125 V DC
Turning gear - Over all reduction – 200:1
Auxiliary gear box –
Pinion speed (Turbine)– 4830 rpm
Starting gear speed (Auxiliary shaft)- 2941rpm
Main LO Pump Gear speed rpm
Diesel engine – 2100 rpm,425 HP

11. Gas Turbine Emission Monitoring of 20.28 MW GTG
After starting , power will be available from the generator.
During the power generation, fuel- air mixture is burnt and some undesired gases like NOx, SOx, CO, CO2 etc. are produced which are not eco – friendly.
In old GTs we don’t not have gas analyzer system but new MW is having a gas analyzer.

12. Gas Analyser The gas components measured are – A) NOX B) SO2
NDIR type infrared gas analyzer, type ZKJ
The gas components measured are –
A) NOX
B) SO2
C) CO INFRARED GAS ANALYSER
D) CO2
E) CH4

13. Operational Condition
Power supply required ---
operating voltage : 85 V to 264 V AC
rated frequency : 50/60 Hz
power consumption : 250 VA max
ambient temperature : - 5 to 45 degree C
Range –
NOX : (0 – 100) ppm/( ) ppm
SO2 : (0 – 100) ppm/( )ppm

14. Infrared Gas Analyser WORKS ON THE PRINCIPLE –
“Different Atomic Molecules Have An Absorption Spectrum In The Wave Band Of Infrared Rays, And The Intensity Of Absorption Is Determined By Lambert – Beer Law”

15. Infrared Method
P Reference Cell Detector Infrared Light Capacitor Source Membrane Measuring Detector Cell P-dP IN OUT

16. Gas analyser system schematic
Gas extractor Flowmeter Infrared gas
analyser
Mist Gas
filter Aspirator Membrane filter
NO2/
Zero O2 NO
NO SO2 CO2 CO Convt.
safety
drain { IR gas
valve analy
ser}
Electronic gas cooler
exhaust
Drain

17. RECALL Gas turbine and its operating principle
Euipment used for starting
Emission
Gas detection

18. Thank you