A New Paraffinic Fuel Impact on Emissions and Combustion Characteristics of a Diesel Engine.

• Having low aromatic compounds, highcetane rating, higher heat of combustion andalmost zero sulphur content, a new paraffinicfuel (NPF), developed by Oroboros ABSweden, was believed to receive attention as anew alternative fuel. Therefore, furtherinvestigation and combustion analyses wereconducted in a research single-cylinder dieselengine, where detailed thermodynamicanalyses were performed by Burst to File highfrequency signal sampling code and by theDragon software, revealing the realthermochemistry history.The aim of this investigation was aneffort to reduce the pollution levels in Santiagode Chile by introducing this new paraffinic fuel(NPF). Experimental results have shown thatthe NPF fuel has a significant impact not onlyon the emission levels, but also on otherenergetic parameters of the engine such asignition delay, cylinder peak pressure, heatrelease gradient, indicated efficiency etc. It isobserved that NPF fuels have shorter ignitiondelay and longer combustion duration whencompared with those obtained when theengine runs on standard Chilean fuel (SCF) atthe same operating point.As shown by the evaluated rate ofheat release in the premixed zone, the fractionof premixed combustion is larger for CSF fuelthan for NPF fuel. This is an indication forsmooth engine running, lower combustion rate,and lower NOx formation. As a complement tothis, in-cylinder processes with lower peakpressure and earlier location are morefavourable when the engine runs on NPF. Itmay be stated that NPF, which is a selectedoptimised C chain-length variation mixture [2],[3], [4], can be used in unmodifiedcompression ignition engines with significantreduction of regulated emission (NOx, HC, CO,CO2), soot, fuel consumption and smootherthermodynamic characteristics. Therefore, theNPF might be considered as a strongcompetitive alternative fuel.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

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