Technical Presentation Duel Fuel Technologies for 2 Stroke MAN B&W Engines

Abstract:

This presentation will cover the state-of-the-art technology in the design of Dual fuel MAN B&W 2 stroke engines.  Special attention to the Methanol engine and the ongoing development of an Ammonia burning engine.

Today MAN B&W engines can operate on different fuels that are considered to be future fuels for the Marine Industry. A diesel technology based on the IC diesel engine principle makes it possible to keep the same high efficiency, up to 55%, and the same high power output.

The two stroke engines are the most used prime mover in ocean going ships today. In 2021, 30% of the contracted output from 2 stroke engines for ships were by Dual Fuel. The MAN B&W engines have a power range from 3 to 83 MW per engine and are based on a modular concept which makes it possible to retrofit the ME-C engine to operate with LNG, Methanol, LPG, Ethane and in near future Ammonia.

The different fuels mentioned have different characteristics which provide different challenges in the design process. The fuel injection components are dependent on the right choice of the materials and tailor made elastomers. For fuels without lubricating ability, such as Methanol, a special design of the fuel injection booster pumps and injection valves has been invented.

A complicated part of the design is to find the right injection pressure to the engine and into the combustion chambers.  The fuel gas supply system is therefore optimized individually. Pressure and amount of the dual fuel to be delivered to the engine is based on the fuel specifics.

The engines still have to comply with IMO Annex Tier II and III and we also need to ensure that other harmful emissions in the exhaust gas are under control.  The Ammonia engine has to be NOx compliant and the amount of Ammonia slip has to be minimized down to an insignificant level.  Testing of this engine will begin this year.

Furthermore, N2O levels need to be 0 ppm as they are very harmful to the GHG. “Regulation for maximum level is not in place yet.”

In this presentation, we would like to introduce our different dual fuel technologies and the consideration of the safety / HAZID / HAZOP, reliability and availability that underlies the engine design.

Speaker:

Kjeld Aabo, MAN Energy Solutions

Director, New Technologies Sales and Promotion Two-stroke Marine

Kjeld Aabo holds a degree in mechanical engineering and a special diploma in marketing.
He joined MAN Diesel in the Stationary Installation Department in 1983. In 1992, he was appointed section manager in the Marine Installation Department and in 1994 he was appointed manager of the Marine Installation Department. In 2002, Kjeld Aabo took over the Engineering Services Department and was appointed Senior Manager. In 2005, he took over the Research Centre Department.
From November 2006, Kjeld Aabo was director of the department for Promotion & Customer Support and from March 2009 head of the Two-stroke Promotion department at the head office for two-stroke engines in Copenhagen, Denmark.

From 2011 to 2014, Kjeld Aabo took over a position in Brazil as head of MAN Marine and Offshore division.
After returning to Denmark in 2014 Kjeld Aabo is Director of new technologies in the Promotion and Sales department for two-stroke engines and GenSet engines.

Kjeld Aabo is Chairman of the CIMAC Heavy Fuel Working Group (WG), and member of the ISO 8217 Heavy Fuel Oil Working Group.