Emulsified Fuels are

emulsions An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable) owing to liquid-liquid phase separation. Emulsions are part of a more general class of two-phase systems of matter called colloids. Althoug ...

composed of water and a combustible liquid, either oil or a fuel. Emulsions are a particular example of a

dispersion Dispersion may refer to: Economics and finance *Dispersion (finance), a measure for the statistical distribution of portfolio returns *Price dispersion, a variation in prices across sellers of the same item *Wage dispersion, the amount of variatio ...

comprising a continuous and a dispersed phase. The most commonly used emulsion fuel is water-in-diesel emulsion. In the case of emulsions, both phases are the

immiscible Miscibility () is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous mixture (a solution). The term is most often applied to liquids but also appli ...

liquids, oil and water. Emulsion fuels can be either a microemulsion or an ordinary emulsion (sometimes referred to as macroemulsion, to differentiate it from microemulsion). The essential differences between the two are stability (microemulsions are thermodynamically stable systems, whereas macroemulsions are kinetically stabilized) and particle size distribution (microemulsions are formed spontaneously and have dimensions of 10 to 200 nm, whereas macroemulsions are formed by a shearing process and have dimensions of 100 nm to over 1 micrometer). Microemulsions are isotropic whereas macroemulsions are prone to

settling Settling is the process by which particulates move towards the bottom of a liquid and form a sediment. Particles that experience a force, either due to gravity or due to centrifugal motion will tend to move in a uniform manner in the direction ...

(or creaming) and changes in particle size over time. Both use surfactants (also called emulsifiers) and can be either water-in-oil (invert emulsions), or oil-in-water (regular emulsions) or bicontinuous (also called multiple or complex emulsions).

Applications

Water continuous (oil-in-water) emulsified fuels are exemplified by the

Orimulsion Orimulsion is a registered trademark name for a bitumen-based fuel that was developed for industrial use by Intevep, the Research and Development Affiliate of Petroleos de Venezuela SA (PDVSA), following earlier collaboration on oil emulsions with ...

system and

bitumen Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term a ...

emulsions. These are often described as a high internal phase emulsion (HIPE) because the continuous phase is around 30% of the composition of the fuel, whereas it is more usual for the dispersed phase to be the minor component. Water continuous emulsions of very heavy crudes, bitumen are easier to pump than the original fuel, which would require considerable heating and / or dilution with a distilled product (kerosene or light crude) in order to make them easy to handle. Water continuous emulsions of residual fuel, heavy fuel oils etc. which have a calorific value and are used in industrial applications can also be converted to emulsified fuels, thus reducing the need to use cutter fluids and improving the combustion emissions associated with the inferior fuels. Oil continuous (water-in-oil) emulsified fuels are exemplified by diesel (or biodiesel blended fuels) and water emulsions. These emulsified fuels were recognized in

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(

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

and

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) and CEN workshop standard was established (CWA 15145:2004). Other types of fuels have been emulsified contain between 5 and 30% water (by mass) in the overall fuel emulsion. Water-in-diesel fuel emulsion could be used as an alternative fuel for low emissions and high brake thermal efficiency. Emulsion to combustion (E2C}or on demand water in fuel emulsions for HFO and Diesel for shipping and stationary boilers are available from Nonox Ltd. since 2006. The advantage of mixing on demand is no chemical surfactants are required, water/fuel ratio can be adjusted to load for maximum efficiency and no chance of separation in storage. This proven system reduces soot emissions up to 90%, NOx 40% and offers fuel savings which vary depending on the baseline efficiency of the load. Microemulsions of fuels have also been prepared. The type of surfactants and quantities required to make these emulsion fuels sets them apart from other commercial emulsion fuels. These are considered where safety issues (e.g. fire prevention;) or commercial return justify the extra costs (e.g. enhance oil recovery, surfactant flooding;).

Theory

The main advantages to using emulsified fuels instead of the fuel itself are environmental and economic benefits. Addition of water to the diesel process decreases combustion temperatures and lowers NO_x emissions. A paper compares water injection and emulsified fuels into diesel engines (marine and stationary engines) and discusses the emissions and mechanisms involved. It concludes that emulsified fuels are singularly effective in simultaneously reducing NO_x and PM emissions. Another paper has examined the effects of EGR and Emulsion Fuels.

References

* 'Experimental investigation of a Diesel engine power, torque and noise emission using Water-Diesel emulsions', Mohammad Reza Seifi et al. http://doi.org/10.1016/j.fuel.2015.10.122

External links

* {{cite magazine , magazine=Oil of Russia , title=In search of the fuel of the future: In the near future, usual types of motor fuel will be replaced by water-fuel emulsions , url=http://www.oilru.com/or/36/716/ , year=2008 , number=3 , given=Vasily , surname=Serdyuk , publisher=

Lukoil The PJSC Lukoil Oil Company ( stylized as LUKOIL or ЛУКОЙЛ in Cyrillic script) is a Russian multinational energy corporation headquartered in Moscow, specializing in the business of extraction, production, transport, and sale of petrol ...

, oclc=74330613 Colloidal chemistry Chemical mixtures Fuels

Applications

Theory

See also

References

External links