How does EFS work?

EFS works based on the principle of producing an emulsified fuel that creates a secondary atomisation effect after the primary injection process, by adding water into the fuel. The secondary atomisation effect creates even smaller fuel droplets after injection. This significantly improves the combustion of the fuel inside engine cylinders as more total surface area of the fuel is exposed to combustion inside the engine. The secondary atomization process is illustrated in the picture below.


What are the requirements of engine for EFS?

Blue Ocean Solutions focuses only on marine diesel engines. EFS is compatible with both slow speed and medium speed marine diesel engines. EFS works on both new and old engines as the secondary atomization effect is independent of the age of engines. Moreover, EFS is installed in the fuel oil service system of the engines. So there is no modifications or adjustments needed to the engines.

How much space is needed for EFS?

The emulsified fuel system comprises of three main modules, namely: emulsifier module, water controller module and EFS signal box. The following are the sizes of the footprint of the modules:

–   Emulsifier module (min/max): 0.5 x 1m / 1 x 2m

–   Water controller module (min/max): 0.7 x 1m / 1 x 2m

–   Signal box: 0.15 x 0.2m

The actual size may vary and can be customised according to the engine room arrangement.

What type of fuels can be used with EFS?

EFS can be used with HFO, MGO and MDO with confirmed and proven fuel savings. There is no use of chemical additives. The additional benefits of running MGO with EFS is higher viscosity and the cooling effect of water. There is no need for a cooler.

Does EFS use any additives?

There is no use of any chemical additives

How are we different from other systems?

BOS Emulsifier was developed after extensive research, specifically for producing optimal water-in-fuel emulsions for achieving the best fuel savings. The non-dimensional emulsifier model (patented) was developed to ensure that BOS emulsifier can be scaled to meet the fuel flow range of any ships.

Other emulsifiers in the market make use of one of the following methods of emulsification.

  • Mechanical shearing/ homogeniser
  • Cavitation
  • Ultra-sonic vibration

All of the above methods have the following drawbacks:

  • Rapid performance deterioration due to wear of parts in the marine environment.
  • Unreliability because of the above reasons.
  • In addition to that, they continuously break the water-in-fuel particles in the re-circulated fuel to nano-sized water particles which do not create the secondary explosion effect. Too small water-in-fuel particles do not have enough energy to produce the desired explosive effect.

In summary, the innovative features that differentiate BOS Emulsifier from others are:

  • Produces optimal water-in-fuel emulsion to create the secondary atomisation effect that improves combustion
  • No moving parts
  • Designed for reliability and easy maintenance
  • Produces emulsified fuel on demand for immediate consumption. Hence, no storage of emulsified fuel is needed. (Storage of emulsified fuel may cause biological corrosion due to growth of biological microbes)
  • Re-emulsifies re-circulated water and fuel to the same optimal emulsified fuel
  • Can be scaled to produce optimal emulsified fuel for ships of any sizes.