The use of water as fuel additive offers a way to drastically reduce the emission of nitric oxides (NOx) and soot.
For this reason, WTZ Roßlau introduces a newly developed fuel-water emulsifying plant. By this plant, it is possible to fulfil applicable limits of exhaust-gas emissions.
The unconventional action to add water to a fuel in an improved mix formation causes a decrease of the peak temperatures in the combustion zone by the evaporation of the water. The formation of nitric oxides is reduced by a decrease of the reaction speed. To provide the water in the combustion chamber, several solutions have been tested. A very efficient way is the insertion of a fuel-water emulsion.
Therefore a fuel-water emulsifying plant has been developed in WTZ Roßlau. It generates an emulsion of good fineness, homogeneity and sufficient stability without the addition of any emulsifiers. The plant is compact and can be easily installed subsequently. Its operation is controlled by the engine parameters. The control unit consists of electronic micro-controller components with implemented program, sensors for speed and pressure upstream the cylinder and a dosing system. The currently required water throughput is calculated in relation to the capacity. By process optimization, comparable NOx values can only be obtained with unreasonable losses in efficiency and a severe increase of other pollutants.
Depending on the operating parameters of the engine, a stable emulsion is
mechanically generated immediately upstream of the fuel pump. This emulsion is
fed to the existing injection system without any further modification. The
emulsion is injected in the combustion chamber through existing conventional
nozzles. Thus the technical modifications at the engine required for the
subsequent installation of the plant are small. Fields of application for the
installation of the emulsifying plant are diesel engines, vegetable-oil
engines, or heavy-oil engine, for example for stationary, marine and