Wärtsilä RT-flex96C
The RT-flex96C is a two-stroke diesel engine from the Swiss manufacturer Winterthur Gas & Diesel , which has been produced by Wärtsilä since 2003 . The 14RT-flex96C version of the in- line engine with 14 cylinders is one of the most powerful piston machines in series production to date , its nominal output is 84.42 MW. The engine is designed for container ships with a payload of 12,000 TEU , which should reach a speed of 46.3 km / h (25 kts) when fully loaded.
Currently the engine as the main drive is container ships of the Emma Mærsk class used, in which he with four ABB - turbochargers a capacity of 80.08 MW reached (109,000 hp). It also serves as the main propulsion system for what was then (2012) the largest container ship in the world, the CMA CGM Marco Polo . As is usual with marine engines, it has a very long stroke with a stroke ratio of 2.60: 1 .
The RT-flex96C, together with the K108 L2 from MAN Diesel & Turbo, is currently one of the combustion engines with the highest energy efficiency. It converts about 50% of the chemical energy of the fuel into kinetic energy to.
Background and development
The RT-flex96C is based on the RTA96C, from which it mainly differs in the mixture preparation process. The abbreviation flex indicates a common rail injection . This injection process was initially tested by Wärtsilä in smaller engines. The first RT-flex96C engines with eight and twelve cylinders were delivered at the end of 2004. The engines of the type RTA96C were originally planned with a maximum number of twelve cylinders, but the requirements of the market made higher engine outputs necessary, so that the RT-flex96C also included models with 13 and 14 cylinders in the range. The 14-cylinder model was offered with an output of 80.08 MW until 2007. The cylinder output has been increased by 5.4% since the end of 2007, resulting in a cylinder output of 6.03 MW instead of the previous 5.72 MW.
Technical data (from 2008)
| Design | In-line engine with 6 to 14 cylinders and turbocharging |
| Working method | Two-stroke diesel engine |
| drilling | 960 mm |
| Hub | 2,500 mm |
| Displacement | 1,809.557 dm 3 per cylinder |
| rotational speed | 22-102 min −1 |
| Torque | 7903.447 kN · m at 102 min -1 |
| medium work pressure | 1.96 MPa at full load , 1.37 MPa at maximum efficiency (85% load) |
| mean piston speed | 8.5 m / s |
| specific consumption | 171 g / ( kWh ) at 102 min −1 and 1.96 MPa working pressure |
| lowest consumption | 163 g / ( kWh ) at 102 min −1 and 1.37 MPa working pressure |
| power | up to 6030 kW per cylinder, 36,180 to 84,420 kW in total |
| Power to weight ratio | 31.2 to 36.69 kW per ton (2300 tons for the 14-cylinder version) |
| Injection quantity per cylinder per stroke | ~ 160 g at full load. Up to 250 tons of fuel daily |
| Weight of the crankshaft | 300 tons for the version with 14 cylinders |
| Fuel type | Heavy oil (residual oil) according to ISO 8217. Viscosity min. 730 mm 2 / s at 50 ° C |
Web links
- Wärtsilä Marine Solutions
- The Most Powerful Diesel Engine in the World , Todd Walke
- Emma Maersk's Wartsila-Sulzer Super Engine
Individual evidence
- ↑ a b c WÄRTSILÄ RT ‑ flex96C AND WÄRTSILÄ RTA96C TECHNOLOGY REVIEW
- ↑ a b The world's most powerful engine enters service . Wärtsilä Corporation press release, June 12, 2006.