FUEL QUALITY ANALYSIS FOR BIOGAS UTILIZATION IN HEAVY DUTY DUAL FUEL ENGINES

摘要

Natural gas (NG) and subsequently synthetic natural gas (SNG) are expected to increase their share ofthe market in the heavy transportation sector. In response to this trend engine suppliers need to develop engines forvarious fuels of both fossil and renewable origin. One possibility is Dual Fuel engines (DF), which uses a Diesel pilotto ignite a gas mixture. To obtain significant share of biofuels, gasification of raw solid biomass to gas isa keyprocess. The initial gas from the gasification,before it is upgraded to SNG, contains of a blend of various gascomponents, which are not commonly present in NG.The upgrading takes place in many process steps increasingcosts and energy losses. The question raised is if there are more efficient routs to introduce biomass derived gas thanrefine it all the way to SNG, from a well to wheel perspective? This work investigates how different gas mixturescould meet emission limits, together with the required performance of efficiency and load, in DF engine. Threeparameters which are fundamental for a proper combustion in a DF engine have been used to define the quality of thefuel: Lower Heating Value (LHV), Methane Number (MN) and Lower Flammability Limit (LFL). The componentsavailable from biomass gasification were evaluated together with those from different NG compositions on theEuropean market.