Wartsila Oyj Abp · OMXHEX:WRT1V
Wartsila Oyj Abp — Wärtsilä — Technical Presentation (2008)
15 slides from Wartsila Oyj Abp's technical presentation, 2008
Slide 1: Operational Experience with a Gas-Diesel Engine running on flare gas
Operational Experience with a Gas-Diesel Engine running on flare gas Dr. Jacob Klimstra Wärtsilä Power Plants www.wartsila.com
Slide 2: The subject/object: Secoya
The subject/object: Secoya • Secoya (Dygoil), Equador – Engines: 2 x Wärtsilä 16V32GD – Electrical output: 11 MW – Type:Fuel sharing, Island mode – Location: Ecuador – Owner: Petro Ecuador – Delivered: 2003 – Speciality: Operates on either associated gas or CRO, or both simultaneously. -2-
Slide 3: 2 x Wärtsilä 16 cylinder GD engine
2 x Wärtsilä 16 cylinder GD engine Electrical output: 5.5 MW per unit -3-
Slide 4: The gas – diesel (GD) working principle
The gas – diesel (GD) working principle Exh Air Exh. Air Exh. Air . Air Compression Injection of Gas Intake of Air and Pilot Fuel Ignition Diesel fuel serves as the igniter Gas is injected simultaneously with the diesel Knocking can not occur -4-
Slide 5: Essential components
Essential components Diesel Gas spray spray -5-
Slide 6: Operation in 'full' gas mode
Operation in ‘full’ gas mode 100 Fuel Share % 90 80 70 60 Gas 50 Liquid 40 30 Constant liquid fuel 20 amount 3 - 5 % of energy input at 100 % load 10 0 10 20 30 40 50 60 70 80 90 0 0 10 Load % -6-
Slide 7: No power problem if the gas flow varies
No power problem if the gas flow varies Diesel Gas share % share % 0 100 diesel GD operation 10 90 pilot 20 80 30 70 40 60 gas and oil 50 50 share Fuel Sharing Fuel Sharing 60 40 adjustable 70 30 80 20 Transfer window 90 10 100 0 Fuel oil operation 0 10 20 30 40 50 60 70 80 90 100 Engine load% -7-
Slide 8: The engine needs compressed gas
The engine needs compressed gas 350 bar Gas of 30 MJ/m3 (n) kW Gas LHV = 30 MJ/Nm3, dicharge pressure = 350 bar(a) 43.5 * 0.954 = 41.5 % 500 450 400 350 4.6% of 18V32GD 16V32GD 300 power 12V32GD 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 -8-
Slide 9: Varying gas composition
Varying gas composition 70 60 molecular fraction (%) CO2 50 N2 40 C1 C2 30 C3 i-C4 20 n-C4 10 0 2003 2004 2005 -9-
Slide 10: Varying gas properties
Varying gas properties year LCV Wobbe Density Air req. MJ/m3 MJ/m3 kg/m3 m3/m3 2003 35.4 41.9 1.12 9.47 2004 41.8 45.1 1.33 11.14 2005 36.0 37.4 1.44 9.59 - 10 -
Slide 11: Compressors don't like liquids
Compressors don’t like liquids Extreme example of a mixture of propane, butane, CO2 and hydrogen Tin (max) = 50 °C Learning Process: Use liquid separators before entering the compressors Heat the gas after separation Use liquid separators at the high pressure stages Beware of sulphur corrosion in th
Slide 12: Performance Sep 29, 2008
Performance Sep 29, 2008 running on crude UNIT 1 UNIT 2 produced kWh 114119 114899 load factor 86.45 87.04 availability 100% 100% reliability 100% 100% net fuel efficiency 39.9 39.9 - 12 -
Slide 13: Performance 1-1-2008 until 31-10-2008
Performance 1-1-2008 until 31-10-2008 - Fuel use: 49% gas, 51% crude (defective part in gas line; no stopping ordered by operator) - Availability: 96.08% per unit - Reliability: 98.75% per unit - Electricity produced: 65 GWh - Maintenance costs: US$ 349,200 = < 0.5 cts/kWh - Load factor: 81% - 13 -
Slide 14: Learning points Gas-Diesel
Learning points Gas-Diesel 1. GD fuel sharing works: varying gas flows can be compensated for with crude oil (or other fuels) 2. Liquids should be removed from the gas, but this is state-of-the art technology 3. Large variations in gas composition pose no problems for the engines 4. A well-designed
Slide 15: Proof of the pudding
Proof of the pudding Running hours: ENGINE 1: 35,904 ENGINE 2: 36,316 (both at October 31, 2008) (May 27, 2005: viz. 7,519 and 7.988 hours) Lowest possible fuel costs due to use of local fuel Flare gas is utilised with high efficiency (40% net) (with absorption chilling 64% net) The owner asked Wärt