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Biofuels are counted as CO2 neutral fuel. However, biofuels are commonly expensive, especially if post treatment like esterization is required. The properties of low grade biofuels are partly not suitable for the application in modern engines. The work therefore describes a research project, where at least some part of the fuel can be supplied from low grade biofuels. For that a dual fuel research engine (single cylinder, 2 liter truck engine) is operated with an additional pre-evaporation reactor, where the low grade fuel is prevaporized. The main ignition and combustion is reached with a direct injection diesel fuel supply. This concept might be applicable for stationary engines. The operation of the engine is established with the help of a heated air and vaporized gas mixing system.  

Detailed measurement series show the ability to operate this engine with various low grade prevaporized biofuels like palm oil or raps oil with amounts up 20 percent, allowing potentially the reduction of CO2 emission of this amount. The partially premixed combustion mode also reduces the primary soot emission by up to 60 percent for constant NOx emission. However, sediments of prevaporized fuel in crevices after about 15 hours of operation would require further solutions before an application.