operating experience on ansaldo energia v94.2 gas turbine
TRANSCRIPT
Operating Experience On Ansaldo Energia V94.2 Gas Turbine In Fuel Oil
Premix Configuration Installed In Middle East
P. Pesce POWERGEN Europe2009
Summary
V94.2 Gas Turbine OverviewV94.2 Gas Turbine Overview
A new project: reducing pollutant emissions in dry fuel oil A new project: reducing pollutant emissions in dry fuel oil operation operation
V94.2 GT Auxiliary SystemsV94.2 GT Auxiliary Systems
V94.2 GT Fuel Oil Premix UpgradesV94.2 GT Fuel Oil Premix Upgrades
V94.2 GT Fuel Oil Premix OperationV94.2 GT Fuel Oil Premix Operation
V94.2 Gas Turbine Overview
16 Compressor stages4 Turbine stages 1 Variable vane (IGV)2 Bearings2 Silos vertical combustion
chambers16 Hybrid burners (Gas&Oil,
Diffusion&Premix)50 Hz (3000 rpm) Speed
A new project
Developing competitive products matching required emissions keeping high performances
MIDDLE EAST AREAV94.2
Barka power plant (OMAN)
•• Three V94.2 Gas Turbines Three V94.2 Gas Turbines
•• MultyMulty Shaft ConfigurationShaft Configuration
•• Fuel Gas and Fuel Oil Operation Fuel Gas and Fuel Oil Operation
••Change Over Between FuelsChange Over Between Fuels
•• Fuel Oil Operation Dry (i.e. No Water Injection or Fuel Oil Operation Dry (i.e. No Water Injection or Emulsion)Emulsion)
V94.2 Upgrade: Gas turbine Fuel Oil Premix Operation
Diffusion & Premix Flame
Diffusion flameLow dilution ratio
Highflame temperature
High NOx production
Premixed flameHigh dilution ratio
Low flame temperature
Low NOx production
Hybrid Burner For Diffusion & Premix Mode
V94.2 Auxiliary Systems
Forwarding SystemForwarding System
Fuel Oil SkidFuel Oil Skid
Ignition Gas SkidIgnition Gas Skid
Purging Water SkidPurging Water Skid
V94.2 GT Auxiliaries: Forwarding System
-Two Or More Centrifugal Pumps (One In Stand-by)
-A Duplex Filter For Each Forwarding Line
- A Couple Of Bladder Accumulators For Each Forwarding Line
V94.2 GT Auxiliaries: Fuel Oil Skid
FO Injection pumps
Duplex filter
FO valves
•Two Centrifugal Injection Pumps (One In Stand By)•Two Bladders Accumulators•A Duplex Filter•A Fuel Oil Drainage Tank•A Fuel Oil Drainage Pump•Control And Emergency Stop Valves Set
V94.2 GT Auxiliaries: Ignition Gas Skid
-Two Solenoid Shut Off Valves-Two Pressure Switches Upstream And Downstream Stop Valves-Automatic Pressure Control Valve-Pressure Relief Valve
V94.2 GT Auxiliaries: Purging Water Skid
-Two Water Gear Pumps (One In Stand By)-Two Water Filters-Two Bladder Accumulators-Two Solenoid Water Shut Off Valves
V94.2 GT Auxiliaries: Purging Water Skid_2
It avoids fuel oil cracking which can endanger fuel oil premix burners
Cooling
Before changeover DO - PO
FO Premix Burners Must Be Cooled To Avoid Coking Of Oil Due To High Burner Temperature
Purging
Before changeover PO - DOFO Premix Burners Must Be Purged to Displace Any Fuel Oil Remained in the Burners Which Could Cause Nozzles Clogging
V94.2 GT Fuel Oil Premix Upgrade
Fuel ControllerFuel Controller
Fuel Oil SequencerFuel Oil Sequencer
MECHANICAL UPGRADE
FUNCTIONAL UPGRADE
FO Premix control valves and lines
FO Premix Burners
FO Premix Ball Valve
Purging Water System
V94.2 Fuel Oil Control Valves
A Control Valve On Diffusion Return Line
A Control Valve On Diffusion Supply Line
A Control Valve For Premix Line
V94.2 Fuel Oil Premix Burners
FUEL OIL PREMIX NOZZLES
V94.2 Fuel Oil Premix Ball Valves
Open position: this position is assumed during gas turbine premix operation
Purging position: this position is assumed during gas turbine’s cooling or purging sequences.
Closed position: this position is assumed when gas turbine is running not in premix mode. Sealing air is used to prevent any dangerous hot gases’ back flow during gas turbine operation.
V94.2 GT FUEL OIL FUNCTIONAL UPGRADE
New sequencer
Upgradated fuel controller
V94.2 GT Fuel Oil Premix Operation
SpeedTETCDO_SL_ CVFO_RL_ CVDO_RL_ PRPO_CVPower
Burners Changeover FO DO-PO
Premix connection
Change over
Piping filling
SpeedTETCDO_SL_ CVFO_RL_ CVDO_RL_ PRPO_CVPower
Burners Changeover FO PO-DO
V94.2 GT Fuel Oil Premix Operation
Change over beginning
Premix disconnection & purging
SpeedTETCDO_SL_ CVDO_RL_ CVDO_RL_ PRPowerFG_ESVFG_CVFO_ESV
Fuel Changeover FG-FO
V94.2 GT Fuel Oil Premix Operation
SpeedTETCDO_SL _CVFO_RL _CVPowerFO_ES VFG_CV
Fuel Changeover FO-FG
V94.2 GT Fuel Oil Premix Operation
V94.2 GT Fuel Oil Premix Operation Data
Ambient conditions UNIT 1T amb=32 °CRH=71.25 %
P amb: 0.994 bar
UNIT 2Tamb=35 °CRH=67.8 %
P amb:0.993 bar
UNIT 3T amb=32 .4°C
RH=69.7%P amb:0.995 bar
POWER (guar. 117,1 MW)
119,4 MW 118,2 MW 118,2 MW
EFFICIENCY(guar. 31,5%)
31,8% 31,56% 31.6%
FO CONSUMPTION
9,42 Kg/s 9,34 Kg/s 9,43 Kg/s
NOX EMISSIONS(guar. 150mg/Nm3)
130 mg/Nm3 135 mg/Nm3 145 mg/Nm3
TETC 527 °C 531°C 535°C
Conclusions
The Experience Was Completely Successful In Terms Of:
Reliability Of The Gas Turbines
Flexibility During Operation
Respect Of Pollutant Emissions
Achievement Of The Expected Performances
ANSALDO ENERGIA Earned A New Improvement
