harnessing available fuel in the most efficient way for greener powering solution
DESCRIPTION
Stig Bøtker, Sales Director, Wärtsilä on how to efficiently harness available fuel in the most efficient way for a greener powering solutionTRANSCRIPT
“Harnessing Available Fuel in the Most Efficient Way for Greener Powering
Solution”
11th Annual FPSO Congress
By
Stig Bøtker
Sales Director Offshore
Ship Power
Agenda
� Wärtsilä in brief
� Setting the scene
� Duel fuel technology and its advantages
� Power plant solutions for FPSOs
� References & operational experience
� Summary
This is Wärtsilä
SHIPPOWER
POWERPLANTS
SERVICES
18 000 employees in 110 Countries
Net sales 2009 5.3 billion EuroOperating results 11.2 %
Merchant OffshoreCruise
and FerryNavy
Special
Vessels
This is Wärtsilä – Ship Power
Every third ship is powered by Wärtsilä
Specials
Power
DistributionPower
DrivesAutomation
Propulsion
Engines
This is Wärtsilä – Solution Provider
Ship Design
Setting the Scene – Power Plant Fundamentals
� Fuel flexibility
� Energy Efficiency
� Operational flexibility
� Low environmental impact
� Tried and tested concept
� Competitive cost
� Capex and Opex
Setting the Scene – Fuel Availability
� Fuel type and availability will depend on the reservoir characteristics and may vary with the extent of the reservoir depletion
� Type of fuel available from the reservoir may vary from gas,
light crude oil to heavy crude oil
� Alternative to reservoir fuel, the fuel may be transported from
shore. This is in general an expensive solution and will due to
the transportation increase the carbon footprint.
Duel Fuel/Multiple fuel power generation facility with low emission and high efficiency would solve many of the
fundamentals for an offshore power plant
Duel Fuel/Gas Engine Technologies
Gas-diesel (GD) engines:
• Runs on various gas / diesel mixtures or alternatively on diesel.
• Combustion of gas, diesel and air mixture in Diesel cycle.
• High-pressure gas injection.
Dual-fuel (DF) engines:
• Runs on gas with 1% diesel (gas mode) or alternatively on diesel (diesel mode).
• Combustion of gas and air mixture in Otto cycle, triggered by pilot diesel injection (gas mode), or alternatively combustion of diesel and air mixture in Diesel cycle (diesel mode).
• Low-pressure gas admission.
Spark-ignition gas (SG) engines:
• Runs only on gas.
• Combustion of gas and air mixture in Otto cycle, triggered by spark plug ignition.
• Low-pressure gas admission.
‘87 … ‘92 ‘93 ‘94 ‘95 ‘96 ‘97 ‘98 ‘99 ‘00 ‘01 ‘02 ‘03 ‘04 ‘05 ‘06 ‘07 ‘08 ‘09 ‘10 ‘11 ‘12
Dual-fuel (DF) engines – Multiple fuel engines
Spark-ignition gas (SG) engines
Gas-diesel (GD) engines
Operating Modes for DF Technology
� Gas mode
� Natural gas + MDO pilot
� Automatic and instant trip to diesel operation in alarm/emergency situation
� Transfer to diesel operation at any load on request
� Diesel mode
� MDO/HFO/crude + MDO pilot
� Operated as an ordinary diesel engine
� Transfer to gas operation at any load below 80%
� Pilot fuel injection in operation also during diesel mode operation
� Transfer between modes without power interruption
Gas mode Diesel mode
10%
80%
100%
Engine
Load
Typical plant efficiency at full output
Coal Fired Steam Plant
Small Size Gas Turbine
Big Size Gas Turbine
Big Size DF Engine
42%
30%
37 %
48%
Typical shaft efficiencies - simple cycle prime movers –No de-rating due to ambient temperature
Duel fuel Engines Efficiency
� The available power for a
duel fuel reciprocating
engine is constant for an
ambient temperature of less
than approximately 45
degrees
� The available power for a
gas turbo generator is
highly depended on the
ambient temperature
Duel Fuel Engines Efficiency
� The efficiency of the DF engine depend less on the power level compared to a gas turbine generator
� The DF engine are especially more efficient then the gas turbines for lower load levels
Temperature [ºC] Output (% of the MCR output in 15ºC, i.e. ISO conditions)
SFOC[g/kWhe]
SFOC[g/kWeh]
Max. power limit
Wärtsilä DF genset
Gas turbine genset
CO2 emissions
Coal Fired Steam Plant Fuel: Coal
Small Size Gas Turbine Fuel:Gas
Big Size Gas Engine Fuel:Gas
800
670
430
Typical CO2 emissions in g/kWh (shaft) - simple cycle prime movers –No de-rating due to ambient temperature
545
Big Size Gas Turbine Fuel:Gas
Dual Fuel Reciprocating Engine Characteristics
� High Efficiency over the full range of ambient temperatures and load levels
� Low emissions due to the high efficiency, clean fuel and a lean burn combustion
� Full fuel flexibility “you pump it – we burn it
With all the advantages why has the solution not been able to penetrate the market ?
34DF
50DF
20DF
0 5 10 15
20V34DF
12V34DF
9L34DF
6L34DF
16V34DF
18V50DF 17.55 MW
16V50DF
12V50DF
9L50DF
8L50DF
6L50DF
9L20DF
8L20DF
6L20DF 1.0 MW
Dual-Fuel Engine Portfolio
Power Plant Solutions for Offshore Oil & Gas
� Module solutions
� Module solutions will typically comprises of 2 to 4 engines
� Container solutions
� The container will typically comprises of 1 to 3 engines
� Hull solutions
� The engines will be installed directly in the hull of the
vessel
Module & Container Solutions
Full equipped stand alone container with one engine
Full equipped stand alone module with four engines
Offshore Power Plant for Brazil
� Field characterized by limited availability of gas and high power requirement due to the use of multiphase pumps
� 6 x18V50DF in 3 modules, total power 102 MW
� Running on tri-fuel: treated crude, MDO and treated well gas
� Delivery July 2011
Installation in Hull
� Power plant can be housed below decks – frees up
topside space
� Conventional “engine room design”
� No need for large suction air ducts or discharge
� Low radiated heat in engine room
� Noise level according to IMO
Power Plant For Offshore Oil and Gas applications
� Dual fuel reciprocating power plants solutions are available for offshore oil & Gas applications
� Considering the advance in electrical motors and VSD a central power plant is able to power an entire offshore production units including compression and pumping requirement
� Reciprocating power plants are especial competitive for power requirement up to 70 MW
� Reciprocating power plants are also competitive for large power requirement if gas only is available for a limited time of the fields life time
Dual-Fuel Engines - References
Dual Fuel sold or running
Power plant 28 installations84 engines>640’000 running hours
LNG carriers62 installations230 engines> 1’500’000 running hours
OSV - FPSO8 installations22 engines>300’000 running hours
Operational Experience with Duel Fuel Engines
� The Wärtsilä DF engines have now been in commercial operation on LNG carriers for > 5 years. Experience from > 1’500’000 engine running hours have been collected
� The DF engines has met or exceeded the requirements in terms of:Reliability, Functionality and Engine performance
� Efficiency > 48% in gas mode
� Fuel back up operation instantly
� Low emissions
� Meet predicted overhaul intervals
� Because of the excellent operational experience Wartsila is willing to sign long term service & operational contracts
� The client will have a low and predictable OPEX for the engines
Operational Experience with Duel Fuel Engines
� Extensive inspection was performed after 18000 running hours to verify the condition of the engines
� Very low wear rates
� Honing marks visible in cylinder liner after 18.000 hours of operation
� No piston ring wear (not measurable)
� Small amount of deposits
� Light tendency of discolor on liner surface
Summary
� A power Plant solution for offshore oil & gas production based on dual fuel reciprocating engines offer :
� Fuel flexibility Yes
� Energy Efficiency Yes
� Operational flexibility Yes
� Low environmental impact Yes
� Tried and tested concept Yes
� Competitive cost Test it next time and you will
be positively surprised
Thank you for your attention