MAN EcoCam further optimises slow-steaming concept
MAN Diesel & Turbo is introducing the MAN EcoCam as a retrofit solution for the low-load optimisation of its low-speed, mechanical engines with single turbochargers. The EcoCam offers significant fuel savings of 2 – 5 g/kW – with short payback times – and delivers an increased Pmax cylinder pressure through the adjustable exhaust-valve timing.
Christian Ludwig – Head of Retrofit & Upgrade – MAN Diesel & Turbo, said: “Slow-steaming is now an established industry standard across all segments, including the tanker and bulker markets, and MAN Diesel & Turbo continuously seeks to further refine its technology and improve efficiency. The MAN EcoCam adjusts the exhaust-valve timing between 10 and 60% load, giving a 2 – 5 g/kW fuel saving with minimal to no interruption to a vessel’s schedule during installation.”
He concluded: “The MAN EcoCam has been thoroughly tested and we are happy that we are now able to provide our customers with a low-load tuning method for mechanically controlled engines with a single turbocharger.”
MAN Diesel & Turbo is initially rolling out the MAN EcoCam to a number of its MAN B&W S50MC-C engines, and will eventually introduce it stepwise to its mid- and large-bore engine programme.
The MAN EcoCam introduces a flexible cam profile, called a virtual cam. The profile is controlled hydraulically by adjusting the amount of actuator oil in the hydraulic pushrod.
Low-load tuning has an impact on torsional vibration and NOx. When a low- load tuning method is installed on an engine, the torsional vibrations’ impact and the NOx level have to be taken into account to ensure that the vibrations’ impact is not harming the engine and that the NOx level is in compliance with IMO regulations. The new torsional vibration calculation and NOx amendment are included when buying the MAN EcoCam.
Fuel Savings and Payback
The EcoCam’s effect on fuel reduction has been verified by two independent testbed installations and aboard a test vessel in service.
The earlier closing of the exhaust valve provides a higher compression pressure, thereby delivering a higher combustion pressure and a lower fuel-oil consumption. Flexible exhaust-valve timing has traditionally only been available to electronically controlled engines.
Depending on an engine’s load profile, the MAN EcoCam typically generates savings in the range of 2 – 5 g/kWh. For smaller engines, this can result in a payback period of as little as 1½ years as is the case, for example, with a 6S50MC-C engine with 6, 000 annual running hours.
About MAN Diesel & Turbo
MAN Diesel & Turbo SE, based in Augsburg, Germany, is the world’s leading provider of large-bore diesel engines and turbomachinery for marine and stationary applications. It designs two-stroke and four-stroke engines that are manufactured both by the company and by its licensees. The engines have power outputs ranging from 450 kW to 87 MW. MAN Diesel & Turbo also designs and manufactures gas turbines of up to 50 MW, steam turbines of up to 150 MW and compressors with volume flows of up to 1.5 million m³/h and pressures of up to 1, 000 bar. The product range is rounded off by turbochargers, CP propellers, gas engines and chemical reactors. MAN Diesel & Turbo’s range of goods includes complete marine propulsion systems, turbomachinery units for the oil & gas as well as the process industries and turnkey power plants. Customers receive worldwide after-sales services marketed under the MAN PrimeServ brand. The company employs around 14, 000 staff at more than 100 international sites, primarily in Germany, Denmark, France, Switzerland, the Czech Republic, India and China. MAN Diesel & Turbo is a company of the Power Engineering business area of MAN SE.